JPH04355667A - Power supply device and particle accelerator using it - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

FIELD OF THE INVENTION The present invention relates to a power supply device, and more particularly to a power supply device suitable for exciting the main electromagnet of a particle accelerator such as a proton synchrotron at high speed and with high precision, and a particle accelerator using the same. .

0002

2. Description of the Related Art Electromagnets are used in synchrotron particle accelerators to control the orbits of particles. The power supply equipment used to excite the electromagnets of such synchrotron particle accelerators is characterized by handling large amounts of electric power, rapidly changing the load current and voltage in a fixed pattern, and operating repeatedly, and is highly accurate. High-speed controllability is required. As a power supply device that excites such an electromagnet,
For example, Hitachi Review (Vol. 60, No. 10, p. 739~
Page 744 “Proton synchrotron main electromagnet power supply control device”
) are listed. In this power supply, the configuration of AVR (voltage control circuit), which is a voltage control system that performs voltage control using the output signal of ACR (current control circuit), which is current control system, as a voltage setting value, is either proportional system (type 0 system) or It was an integral system (type 1 system).

0003

[Problems to be Solved by the Invention] In the conventional power supply device described above, the AVR is used as a voltage control system that performs constant voltage control.
Because the constant voltage control circuit (constant voltage control circuit) is a proportional system (0 type system) or an integral system (1 type system), the recovery characteristics of the output voltage are poor, and when a voltage disturbance occurs, the load current fluctuates greatly. There was a problem.

Furthermore, since the load current is ultimately controlled based on the output of the voltage control system, when the load current is changed by the current control system, the current control for the load may be delayed due to the response delay of the voltage control system. There was a problem that the responsiveness of the system decreased.

The present invention has been made in view of the above circumstances, and is capable of suppressing fluctuations in load current to a small level in response to voltage disturbances, and is capable of responding to a current setting value given to a current control system. It is an object of the present invention to provide a highly accurate power supply device capable of high-speed response with little delay.

A further object of the present invention is to provide a particle accelerator using the present power supply device.

[0007]

[Means for Solving the Problems] The power supply device of the present invention includes an AC/DC conversion means that has a switching element, converts alternating current to direct current, and supplies a direct current voltage to a load, and a current command based on a current pattern flowing through the load. current command generating means for generating;
Current control means inputs the deviation between the current command and the load current detection value, generates and outputs the output voltage command of the AC/DC conversion means necessary to remove this deviation, and detects the voltage command and the output voltage of the AC/DC conversion means. voltage control means for inputting the deviation from the value and generating and outputting a firing phase angle command for the AC/DC converting means necessary to remove this deviation; and a control means for controlling the output of the AC/DC conversion means by controlling the voltage control means, and the voltage control means is characterized in that it is configured to integrate the above-mentioned deviation and further perform proportional integration of this integral value.

Further, in the power supply device of the present invention, the current command generating means is characterized in that the curved portion of the current pattern to be set is formed using a cubic spline function that is continuous up to the second derivative.

Furthermore, in the power supply device of the present invention, the voltage pattern of the output voltage of the AC/DC conversion means corresponding to this current pattern is calculated by using the current pattern set by the current command generation means and the load characteristic constant, and this voltage The present invention is characterized in that it has a voltage advance command generation means for generating an output voltage advance command based on a pattern, and adds this output voltage advance command to the output voltage command generated by the current control means.

Furthermore, the power supply device of the present invention includes an AC/DC converting means that has a switching element and converts alternating current into direct current and outputs it, detects a pulsating component of the output voltage of the AC/DC converting means, and detects a pulsating component of the output voltage of the AC/DC converting means, and An active filter that generates a phase voltage and superimposes it on the output side signal of the AC/DC conversion means, a current command generation means that generates a current command based on the current pattern flowing through the load, and this current command and a load current detection value. Current control means generates and outputs an output voltage command of the AC/DC conversion means necessary to remove this deviation, and inputs the deviation between this voltage command and the output voltage detection value of the AC/DC conversion means. The voltage control means generates and outputs a firing phase angle command for the AC/DC converting means necessary to remove this deviation, and the switching element of the AC/DC converting means is controlled based on the firing phase angle command. control means for controlling the output of the conversion means; the voltage control means integrates the deviation;
Furthermore, the integrated value is proportionally integrated, and the active filter is characterized in that a voltage obtained by subtracting the output voltage command input to the voltage control means from the output voltage of the AC/DC conversion means is input.

Furthermore, the particle accelerator of the present invention includes a particle generator that generates particles, a pre-stage accelerator that accelerates the particles generated by the particle generator to a predetermined energy level, and a main electromagnet that accelerates the particles accelerated by the pre-stage accelerator. In the particle accelerator, the particle accelerator includes a final stage accelerator that accelerates the particles by a high-frequency accelerating cavity and imparts a predetermined energy while rotating them, and a power supply device that excites the main electromagnet.The power supply device has a switching element and converts alternating current to direct current. inputs the deviation between this current command and the load current detection value, generates and outputs the output voltage command of the AC/DC converter necessary to remove this deviation. current control means for
Voltage control means inputs the deviation between this voltage command and the output voltage detection value of the AC/DC conversion means, generates and outputs a firing phase angle command of the AC/DC conversion means necessary to remove this deviation, and a firing phase angle and a control means for controlling the output of the AC/DC converting means by controlling the switching elements of the AC/DC converting means based on the command, and the voltage controlling means is configured to integrate the deviation and further proportionally integrate this integral value. It is characterized by the following.

0012

[Operation] In the power supply device having the above configuration, the voltage control means as a voltage control system takes in the deviation between the output voltage command generated by the current control means and the output voltage detection value of the AC/DC conversion means, and corrects this deviation at least. Since it is configured to perform second-order integration processing and output as the output voltage command of the AC/DC conversion means, it is possible to improve responsiveness, rapidly suppress voltage disturbances, and reduce output current (load current) caused by voltage disturbances. ) can be made extremely small.

Further, in the power supply device of the present invention, the current pattern output by the current command control means is formed by a cubic spline function whose curved portion is continuous up to the second derivative. Therefore, the voltage setting value given by the current control means becomes smooth, so transient deviations due to response delays of the voltage control means are reduced, and the current pattern given to the constant current control means by the current command control means and the load current are reduced. Transient deviations can be reduced.

Furthermore, in the power supply device of the present invention, the voltage advance command generation means uses the current pattern and load characteristic constant set by the current command generation means to generate the voltage pattern of the output voltage of the AC/DC conversion means corresponding to this current pattern. This is determined by calculation, and an output voltage advance command is generated based on this voltage pattern. This output voltage advance command is added to the output voltage command of the AC/DC conversion means generated by the current control means. Therefore, since the load current can be changed by feedforward control, high-speed response to current patterns is possible.

Furthermore, in the power supply device of the present invention, voltage pulsations contained in the output voltage of the thyristor converter as the AC/DC conversion means are detected by the active filter, and a voltage having an opposite phase to this voltage pulsation is generated to perform AC/DC conversion. It is superimposed on the signal on the output side of the means. This makes it possible to suppress voltage pulsations included in the output voltage of the AC/DC converter. Here, a voltage obtained by subtracting an output voltage command generated by the current control means input to the voltage control means from the output voltage of the AC/DC conversion means is input to the active filter. Therefore, the active filter does not operate in response to a voltage change due to current control that operates due to a change in the current command value, and the operation can be stabilized.

Further, according to the particle accelerator of the present invention, the orbit of the particles is accurately maintained by exciting the main electromagnet with a predetermined current and voltage pattern by the power supply device having the above-mentioned configuration and having high precision and high speed response. However, particles can be accelerated to a predetermined energy level in a stable state in a short period of time.

[0017]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows the configuration of an embodiment of a power supply device according to the present invention. In the figure, the power supply device includes a thyristor converter 1 (AC/DC converter) that converts AC power into DC power, a DC filter 2 that smoothes the output voltage of the thyristor converter 1, and a thyristor converter 1 that converts AC power into DC power. A current detector 4 that detects the current (load current) i supplied from the converter 1 to the electromagnet 3 as a load, and a current control circuit 5 (current control means) that operates based on a current command r.
and a voltage control circuit 6 (voltage control means) which uses the output of the current control circuit 5 as a voltage setting value, and controls the control angle of each thyristor constituting the thyristor conversion device 1 based on the output voltage of the voltage control circuit 6. It mainly consists of an automatic pulse phase shifter 7.

The voltage control circuit 6 also includes an integral calculation circuit 61 that integrates the output signal of the adder 8, and a proportional-integral calculation circuit 62 that proportionally integrates the output signal of the integral calculation circuit 61. (type 2 system). Voltage control circuit 6, automatic pulse phase shifter 7 and thyristor conversion device 1
Fig. 2 shows a block expressing the control system including the transfer function using a transfer function. In FIGS. 1 and 2, k3 is a gain, ω0 is a resonance frequency, ζ is a damping constant, s is a Laplace operator, and w is a voltage disturbance. The response speed can be improved as ω0 is increased, but since there is a control delay due to the characteristics of the thyristor conversion device, it is appropriate to set it to 500 to 1000 rad/s. A voltage control circuit serving as a voltage control system constituting a conventional power supply device of this kind has been configured as a proportional system or an integral system. Therefore, for example, a voltage disturbance w occurs at the output part of a thyristor converter which is an AC/DC converter.
is applied, the output voltage of the voltage control circuit becomes as shown in FIG. 3(a) in the case of a proportional system, and as shown in FIG. 3(b) in the case of an integral system. That is, when the voltage control circuit is configured with a proportional control system, a part of the disturbance voltage w remains as a steady-state deviation δ due to a control offset in the proportional control, and as a result, the output current (load current) fluctuates.

Furthermore, if the voltage control circuit is configured as an integral system, it is possible to eliminate the steady-state deviation δ, but an error voltage is generated due to a transient response delay, and approximately this integral value (
This produces a current fluctuation of the value obtained by dividing the voltage/time product (Vt) by the inductance of the electromagnet.

On the other hand, the response waveform of the constant voltage control circuit 6 of the power supply device according to the present invention to a voltage disturbance is as shown in FIG. 3(c). That is, if the control method of the present invention is adopted,
The response to voltage disturbance is faster than in the case of the integral system shown in Figure 3(b), and if the damping constant ζ of the response waveform is selected from 0.7 to 1.5, as shown in Figure 4. Since the voltage change overshoots, Vt due to the error voltage of the voltage control system caused by the voltage disturbance can be reduced to almost zero, and as a result, almost no output current fluctuation occurs. In FIG. 3, u is the output voltage command output from the constant current control circuit 5, and v is the output voltage of the thyristor conversion device 1.

Next, the voltage control system (
FIG. 5 shows the gain characteristics when ζ=1 in the closed loop of the voltage control circuit), and FIG. 6 shows the phase characteristics. In these figures, curve A shows the characteristics of the voltage control system of the power supply device according to the present invention, and curve B shows the characteristics of the voltage control system of the conventional power supply device. As is clear from these figures, in the voltage control system of the power supply device according to the present invention, the frequency is less than half of the resonance frequency ω0, ω0 = 500 to 1000 rad/s.
For example, when a voltage pattern with a frequency of about 50 Hz is applied, there is almost no phase delay (follow-up delay) and control is possible. On the other hand, in the voltage control system (integral control system) of a conventional power supply device, a phase delay occurs even within the band.

By the way, when the power supply device according to the present invention is applied to an excitation power source for a main electromagnet of a particle accelerator such as a proton synchrotron, the current is inputted to the current control circuit 5 in FIG. 1 via the adder 9. Current setting value (current pattern) r
is as shown in FIG. In FIG. 7, a period Ta is an injection period for the protons generated in the proton generator to enter the accelerator, a period Tb is an acceleration period for accelerating the protons in the accelerator,
The period Tc is a proton extraction period, and the period Td is a reset period for returning the current to the value at the time of injection.

Next, the process of generating a current pattern for suppressing the transient deviation between the current setting value r input to the current control circuit 5 and the detected output of the current detector 4 will be explained with reference to FIG. do. Of the basic current pattern shown in FIG. 7, a description will be given focusing on a portion transitioning from the incidence period Ta to the acceleration period Tb. Here, the output voltage Vd applied to the electromagnet 3 by flowing a load current i according to the current pattern is as follows, where R is the resistance of the electromagnet 3 and L is the inductance. Therefore, when a broken line pattern of current is applied, such as the basic current pattern shown by the broken line in FIG. 8(a), the component di/dt of the second term on the right side of the above equation will be as shown by the broken line in FIG. 8(b). Since the voltage changes stepwise from 0 to A, the transient deviation in the voltage control circuit increases, which is undesirable. Therefore, as shown by the solid line in Fig. 8(b), d
In order to change the i/dt component continuously and slowly,
As shown by the solid line in FIG. 8(a), smoothing processing is performed on the bent portions of the current pattern. First, Figure 8(b)
), the smoothing time T is set so that the component di/dt does not change stepwise from 0 to A. Here, the smoothing time refers to a period during which two straight line portions of a current pattern (voltage pattern) are connected by a spline function (a function that smoothly connects two straight lines). The smoothing time T is taken by T/2 before and after the slope change time of the current i when the smoothing process, that is, the process of smoothing the two straight line parts by a spline function, is not performed, and is continuous up to the second derivative as a spline function. In order to obtain an accurate current pattern, that is, to make the derivative of di/dt quadratic, a cubic spline function is used in this embodiment. As a specific example, as a function of the differential value di/dt of the current pattern, (1-cos(π・t
/T))/2 is selected. This curve becomes as shown by the solid line in FIG. 8(b). Note that the smoothing time T is desirably 50 Hz or less when expressed in frequency as f=1/T in order to obtain the effect of suppressing transient deviations.

The current pattern (current command) smoothed in this way is actually generated by arithmetic processing using a computer, etc., and is finally D/A converted and output as the current setting value r. (Figure 8(c)). At this time, the voltage Vd applied to the electromagnet 3, which is the load, is shown in FIG.
As shown in (d), the curve becomes a continuous and gradual change.

In the above configuration, the adder 9 calculates the deviation between the current setting value r and the load current i detected by the current detector 4 and inputs it to the current control circuit 5. The current control circuit 5 calculates the output voltage command of the thyristor conversion device 1 necessary to make the deviation zero based on the deviation, and outputs it to the adder 8 as a voltage setting value u. Here, since the current setting value r has been smoothed, the voltage setting value u has also been smoothed.

The adder 8 calculates the deviation between the voltage setting value u and the output voltage v of the thyristor conversion device 1, and this deviation is input to the voltage control circuit 6. In the voltage control circuit 6, an integral calculation circuit 61 and a proportional integral calculation circuit 62 perform integration and proportional integral calculation on the above deviation, and output the results to the automatic pulse phase shifter 7 as a final firing phase angle command.

The automatic pulse phase shifter 7 controls the output voltage v of the thyristor converter 1 in accordance with the output voltage command of the voltage control circuit 6, and this output voltage v is output to the adder 8 and also to the DC filter 2. is input. The output voltage v of the thyristor conversion device 1 is applied to the electromagnet 3 after the AC component is removed by the DC filter 2 . A voltage Vd is applied to the electromagnet 3, and a current i flows through its exciting coil. This current i is detected by a current detector 4, and its detection output is input to an adder 9. The adder 9 calculates the deviation between the current setting value r and the detection output i of the current detector 4.

In this manner, the output of the excitation current i of the electromagnet 3 is controlled. Here, the parameters of the transfer function of the voltage control circuit 6, that is, the voltage control system of the power supply device, are such that the attenuation constant is such that the product V·t of the error voltage V caused by the voltage disturbance and the time t becomes zero, as described above. ζ is 0.7 to 1.
5. The resonance frequency ω0 is selected to be 500 to 1000 rad/s. Therefore, even if a voltage disturbance occurs on the output side of the thyristor conversion device 1, fluctuations in the output current of the electromagnet 3 can be suppressed to an extremely small level.

Next, another embodiment of the power supply device according to the present invention is shown in FIG. In this figure, the same elements as those in FIG. 1 are given the same reference numerals, and redundant explanation will be omitted. This embodiment differs from the embodiment shown in FIG. 1 in terms of configuration in that a voltage setting value u0 for feedforward control is generated by a setting value generator 11 in addition to the current setting value r.
An active filter 10 is placed between the DC filter 2 and the electromagnet 3.
is provided. In FIG. 9, the set value generator 11 includes a computer 110 and D/A converters 111, 11.
It is composed of 2. The active filter 10 also includes an adder 100, a high-pass filter 101, and an amplifier 10.
2 and a reactor transformer 103.

In the above configuration, when a new current setting value 12 is given to the setting value generator 11 from the outside, the computer 1
In step 10, the setting value pattern s is calculated by the above-described smoothing processing algorithm that is continuous up to the second derivative, and the setting value pattern s at each time is output at each sampling time Ts. This set value pattern s is converted into an analog quantity r by the D/A converter 111 and output to the adder 9. The adder 9 calculates the deviation between this current setting value r and the load current i of the electromagnet 3 detected by the current detector 4, and inputs it to the current control circuit 5, where the current is made constant and the voltage It is output to the adder 81 as the set value u.

On the other hand, this adder 81 includes a set value generator 1.
A voltage setting value u0 generated from 1 is input. As shown in FIG.
The current setting value 12 (FIG. 10(a)) inputted into the current setting value 12 (FIG. 10(a)) is converted into a voltage pattern u00 (FIG. 10(b)), and this voltage pattern is further converted into a voltage pattern u0 by smoothing processing. This voltage pattern u0 is output to the adder 81 via the D/A converter 112. As a result,
The output voltage command u+u0 is output from the adder 81 to the adder 8.
and is input to the active filter 10. The output voltage v of the thyristor conversion device 1 is input to the adder 8, and the error voltage (deviation) u+u0-v is input to the voltage control circuit 6. The voltage control circuit 6 performs voltage control through the operations described above, and finally controls the output of the excitation current i of the electromagnet 3.

On the other hand, the output voltage v of the thyristor conversion device 1
The pulsating component of the signal is reduced by the DC filter 2, and the signal is input to the active filter 10. In the active filter 10, the output voltage of the DC filter 2 and the output voltage of the adder 8 are inputted to an adder 100, and the adder 100 calculates the deviation thereof. The output voltage of the adder 100 is input to a high-pass filter 101, and the high-pass filter 101 extracts an alternating current component. This AC component is output to reactor transformer 103 via amplifier 102. In the reactor transformer 103, the output voltage of the amplifier 102 is inverted,
An AC component having a phase opposite to that included in the output voltage of the DC filter 2 is induced on the secondary side of the reactor transformer 103 . As a result, the AC component included in the output voltage of the DC filter 2 is removed.

Further, in this embodiment, a voltage obtained by subtracting the voltage setting value from the output voltage of the thyristor conversion device 1 is input to the active filter 10. Therefore, the active filter 10 does not operate in response to a voltage change due to current control due to a change in the current setting value, and the operation can be stabilized. Furthermore, since the power supply device according to this embodiment has a type 2 voltage control system, it is possible to reduce the error between the voltage setting value and the actual output voltage for the reason described above, so that the capacity of the active filter can be reduced. can be reduced.

Next, an embodiment will be described in which the power supply device according to the present invention is applied as an excitation power source for a main electromagnet of a synchrotron particle accelerator. First, the overall configuration (not shown) of a proton synchrotron, which is a typical synchrotron particle accelerator, will be explained.

[0035] Protons (
Hydrogen ions) are accelerated by high voltage in the pre-accelerator,
It is further accelerated by a booster in the linear accelerator, sent to the final stage accelerator (main ring), accelerated while rotating, and given a predetermined energy.

The final stage accelerator has a circular orbit, and a main electromagnet and a high frequency acceleration cavity are arranged on the circular orbit. The main electromagnet consists of a deflecting electromagnet that deflects the protons so that they orbit in a circumference, a focusing quadrupole electromagnet that focuses the proton beam so that it does not deviate from the circumferential orbit, and a diverging quadrupole electromagnet. Furthermore, a power supply device for DC exciting each electromagnet is also provided. These power supply devices have a large output, rapidly change the load current and load voltage in a fixed pattern, and repeat this pattern periodically, so they are required to have high accuracy, high power factor, and high reliability.

The high frequency acceleration cavity is a device that accelerates protons using a high frequency magnetic field, and the protons are gradually accelerated each time they pass through the high frequency acceleration cavity.

Next, FIG. 1 shows the connection between the electromagnet of the proton synchrotron and the power supply device according to the present invention that excites the electromagnet.
Shown in 1. In the figure, the bending electromagnet excitation power source 31 is
The focusing quadrupole electromagnet excitation power source 32 is a power source that excites the focusing quadrupole electromagnet 35 . Further, the divergent quadrupole electromagnet excitation power source 33 is a power source that excites the divergent quadrupole electromagnet 36. Each electromagnet is connected in series.

Next, the acceleration of protons will be explained. When accelerating protons, the magnetic fields generated by these electromagnets are increased in proportion to the energy of the protons. If the time to accelerate protons is, for example, 1 second, the protons will be accelerated to a predetermined energy level from a magnetic field of about 10%, which corresponds to the low energy level at the beginning of acceleration when the protons are launched into the final stage accelerator. The magnetic field is rapidly changed in 1 second to 100% of the energy level corresponding to the protons. In order to focus the proton beam so that it does not deviate from the circular orbit, the precision of the magnetic field is 0.01.
It is necessary to perform control with high precision of at least 10%. Therefore, each power supply device that supplies excitation current to each electromagnet that makes up the proton synchrotron is required to have extremely high precision, suppress ripple, and have characteristics that allow it to change the load current (excitation current) at high speed. Ru.

By applying the power supply device according to the present invention to a synchrotron particle accelerator, the orbit of the particles can be maintained accurately, so that the particles can be accelerated to a predetermined energy level in a short time and in a stable state. .

[0041]

As described above, according to the power supply device of the present invention, the voltage control means as a voltage control system is controlled by the output voltage command generated by the current control means and the output voltage detection value of the AC/DC conversion means. Take the deviation and reduce this deviation to at least 2
Since the structure is configured to perform floor integral processing and output it as the output voltage command of the AC/DC conversion means, responsiveness can be improved, voltage disturbances can be rapidly suppressed, and fluctuations in load current caused by voltage disturbances can be minimized. Can be made smaller.

Further, according to the power supply device of the present invention, the current pattern output by the current command control means is formed using a cubic spline function whose curved portion is continuous up to the second derivative. Therefore, the response delay of the voltage control means to the voltage setting value given by the current control means is reduced, and transient deviations caused by voltage disturbances between the current pattern given to the current control means by the current command generation means and the load current are reduced. Can be made smaller.

Further, according to the power supply device of the present invention, the output voltage pattern of the AC/DC conversion means corresponding to this current pattern is generated by the voltage advance command generation means using the current pattern flowing through the load and the load characteristic constant, and the output voltage is Since it is configured to add to the command, the load current can be changed by feedforward control, and high-speed response to the current pattern is possible.

Furthermore, according to the power supply device of the present invention, voltage ripples included in the output voltage of the thyristor converter as the AC/DC converter are detected by the active filter, and a voltage having a phase opposite to this voltage ripple is generated. Since it is configured to be superimposed on the signal on the output side of the AC/DC converter, voltage pulsations included in the output voltage of the AC/DC converter can be suppressed. Since the active filter receives the voltage obtained by subtracting the output voltage command generated by the current control means input to the voltage control means from the output voltage of the AC/DC conversion means, the voltage generated by current control as the current pattern changes is input to the active filter. The active filter does not operate in response to changes, and the operation of the power supply device can be stabilized.

Further, according to the particle accelerator of the present invention, the orbit of the particles can be accurately maintained by exciting the main electromagnet with a predetermined current and voltage pattern by the power supply device having the above-mentioned configuration and having high precision and high speed response. However, particles can be accelerated to a predetermined energy level in a short period of time and in a stable state.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of a power supply device according to the present invention.

FIG. 2 is a block diagram expressing a control system including a constant voltage control circuit, a constant current control circuit, an automatic pulse phase shifter, and a thyristor conversion device of the power supply device shown in FIG. 1 using a transfer function.

FIG. 3 is an explanatory diagram showing the response characteristics of the voltage control system of the power supply device according to the present invention to voltage disturbances in comparison with a conventional device.

FIG. 4 is a characteristic diagram showing a specific example of the response characteristics of the voltage control system of the present invention to voltage disturbances.

FIG. 5 is a characteristic diagram showing the gain characteristics of the voltage control system of the power supply device according to the present invention.

FIG. 6 is a characteristic diagram showing the phase characteristics of the voltage control system of the power supply device according to the present invention.

FIG. 7 is a waveform diagram showing an example of a current pattern applied to the current control system of the power supply device according to the present invention.

FIG. 8 is an explanatory diagram showing the contents of smoothing processing of the power supply device according to the present invention.

FIG. 9 is a block diagram showing another embodiment of the power supply device according to the present invention.

10 is an explanatory diagram showing a voltage pattern applied to the voltage control system for feedforward control in the power supply device shown in FIG. 9; FIG.

FIG. 11 is a wiring diagram showing the connection relationship between each electromagnet constituting a proton synchrotron as a particle accelerator and a power supply device that excites each electromagnet.

[Explanation of symbols]

1 Thyristor conversion device 2 DC filter 3 Electromagnet 4 Current detector 5 Constant current control circuit 6 Constant voltage control circuit 7 Automatic pulse phase shifter 8, 9 Adder 10 Active filter 11 Set value generator 100 Adder 101 High pass filter 102 Amplifier 103 Reactor transformer 110 Calculator

Claims (12)

[Claims] 1. AC/DC conversion means for controlling the firing phase of a switching element based on a given firing phase angle command and outputting a voltage corresponding to the firing phase angle command to a load;
Input the deviation between the current command of the load current and the detected load current value,
A current control means that generates an output voltage command based on the deviation, inputs the deviation between the output voltage command and the output voltage detection value of the AC/DC conversion means, performs at least second-order integration processing on the deviation, and performs the AC/DC conversion. A power supply device comprising voltage control means for outputting an ignition phase angle command of the means. 2. AC/DC converting means having a switching element and converting alternating current into direct current and supplying a direct current voltage to a load; current command generating means generating a current command based on a current pattern flowing through the load; current control means that inputs a deviation between the command and the detected load current value and generates and outputs an output voltage command of the AC/DC conversion means necessary to remove the deviation;
Voltage control means that inputs a deviation between the voltage command and the output voltage detection value of the AC/DC conversion means, and generates and outputs a firing phase angle command of the AC/DC conversion means necessary to remove the deviation;
control means for controlling the output of the AC/DC converting means by controlling a switching element of the AC/DC converting means based on the firing phase angle command; the voltage controlling means integrates the deviation; A power supply device characterized by having a configuration in which an integral value is proportionally integrated. 3. The power supply device according to claim 1, wherein the resonant frequency ω0 of the voltage control means is set to 500 to 1000 rad/sec. 4. The attenuation constant ζ of the voltage control means is 0.
3. The power supply device according to claim 1, wherein the power supply voltage is set to 7 to 1.5. 5. The current command generating means is characterized in that the curved portion of the current pattern to be set is formed using a cubic spline function that is continuous up to the second derivative. A power supply device as described in any of the above. 6. A voltage pattern for calculating an output voltage of the AC/DC converting means corresponding to the current pattern using the current pattern and a load characteristic constant, and generating an output voltage advance command based on the voltage pattern. 3. The power supply device according to claim 1, further comprising a preceding command generating means, wherein the preceding output voltage command is added to the output voltage command. 7. The power supply device according to claim 5, wherein the frequency applied to the bent portion of the current pattern or voltage pattern is 50 Hz or less. 8. AC/DC converting means having a switching element and converting alternating current into direct current and outputting the same, detecting a pulsating component of the output voltage of the AC/DC converting means, and generating a voltage having a phase opposite to the pulsating component. an active filter that superimposes the signal on the output side of the AC/DC conversion means; a current command generation means that generates a current command based on the current pattern flowing through the load; and a deviation between the current command and the detected load current value. , current control means for generating and outputting an output voltage command of the AC/DC converting means necessary to remove the deviation; inputting the deviation between the output voltage command and the detected output voltage value of the AC/DC converting means; A voltage control means for generating and outputting a firing phase angle command of the AC/DC converting means necessary to remove the deviation, and AC/DC converting by controlling a switching element of the AC/DC converting means based on the firing phase angle command. control means for controlling the output of the means, the voltage control means is configured to integrate the deviation and further proportionally integrate the integrated value, and the active filter has a control means for controlling the output voltage of the AC/DC conversion means. A power supply device characterized in that a voltage obtained by subtracting the output voltage command input to the voltage control means is input. 9. A particle generator that generates particles, a pre-accelerator that accelerates the particles generated by the particle generator to a predetermined energy level, and a main electromagnet that rotates the particles accelerated by the pre-accelerator. a final stage accelerator that accelerates and imparts a predetermined particle energy using a high-frequency acceleration cavity;
In the particle accelerator, the power supply device includes an AC/DC conversion means that has a switching element, converts alternating current into direct current, and supplies a direct current voltage to a load, and a current pattern that flows through the load. a current command generating means that generates a current command based on the current command, inputs a deviation between the current command and the detected load current value, and generates and outputs an output voltage command of the AC/DC converting means necessary to remove the deviation. current control means; and voltage control for inputting a deviation between the voltage command and the output voltage detection value of the AC/DC converting means, and generating and outputting a firing phase angle command for the AC/DC converting means necessary to remove the deviation. and control means for controlling the output of the AC/DC converting means by controlling a switching element of the AC/DC converting means based on the firing phase angle command, and the voltage controlling means integrates the deviation. . A particle accelerator further comprising a structure in which the integral value is proportionally integrated. 10. A particle generator that generates particles, a pre-stage accelerator that accelerates the particles generated by the particle generator to a predetermined energy level, and a main electromagnet that rotates the particles accelerated by the pre-stage accelerator. In a particle accelerator that includes a final stage accelerator that accelerates and imparts predetermined particle energy using a high-frequency acceleration cavity, and a power supply that excites the main electromagnet, the power supply has a switching element that converts alternating current into direct current. , an AC/DC conversion means for supplying DC voltage to the load, a current command generation means for generating a current command based on the current pattern flowing through the load, and inputting a deviation between the current command and the detected load current value, and calculating the deviation. a current control means for generating and outputting an output voltage command of the AC/DC converting means necessary for removing the AC/DC converting means; inputting a deviation between the voltage command and a detected output voltage value of the AC/DC converting means; A voltage control means for generating and outputting a necessary firing phase angle command of the AC/DC converting means, and output control of the AC/DC converting means by controlling a switching element of the AC/DC converting means based on the firing phase angle command. The voltage control means is configured to integrate the deviation and further perform proportional integration of the integrated value, and the current command generation means is configured to convert the bending part of the current pattern to be set into a secondary conductor. A particle accelerator characterized in that it is formed using a cubic spline function that is continuous up to the function. 11. A particle generator that generates particles, a pre-accelerator that accelerates the particles generated by the particle generator to a predetermined energy level, and a main electromagnet that rotates the particles accelerated by the pre-accelerator. In a particle accelerator that includes a final stage accelerator that accelerates and imparts predetermined particle energy using a high-frequency acceleration cavity, and a power supply that excites the main electromagnet, the power supply has a switching element that converts alternating current into direct current. , an AC/DC conversion means for supplying DC voltage to the load, a current command generation means for generating a current command based on the current pattern flowing through the load, and inputting a deviation between the current command and the detected load current value, and calculating the deviation. a current control means for generating and outputting an output voltage command of the AC/DC converting means necessary for removing the AC/DC converting means; inputting a deviation between the voltage command and a detected output voltage value of the AC/DC converting means; A voltage control means for generating and outputting a necessary firing phase angle command of the AC/DC converting means, and output control of the AC/DC converting means by controlling a switching element of the AC/DC converting means based on the firing phase angle command. A voltage pattern of the output voltage of the AC/DC converting means corresponding to the current pattern is calculated by using the control means for performing the operation, the current pattern set by the current command generation means, and the load characteristic constant, and the voltage pattern is calculated based on the voltage pattern. a voltage advance command generation means for generating an output voltage advance command, adds the output voltage advance command to the output voltage command, integrates the deviation, and further performs proportional integration on the integral value. A particle accelerator characterized by having a configuration in which: 12. A particle generator that generates particles, a pre-accelerator that accelerates the particles generated by the particle generator to a predetermined energy level, and a main electromagnet that rotates the particles accelerated by the pre-accelerator. In a particle accelerator that includes a final stage accelerator that accelerates and imparts predetermined particle energy using a high-frequency acceleration cavity, and a power supply that excites the main electromagnet, the power supply has a switching element that converts alternating current into direct current. an active filter that detects a pulsating component of the output voltage of the AC/DC converting means and generates a voltage having an opposite phase to the pulsating component and feeds it back to the output side of the AC/DC converting means; and a load. a current command generating means that generates a current command based on a current pattern to be applied to the current command; and inputting a deviation between the current command and the detected load current value, and generating an output voltage command of the AC/DC converting means necessary to remove the deviation. A current control means that generates and outputs a deviation between the voltage command and the output voltage detection value of the AC/DC converting means is input, and a firing phase angle command of the AC/DC converting means necessary to remove the deviation is generated. and a control means for controlling the output of the AC/DC converting means by controlling a switching element of the AC/DC converting means based on the firing phase angle command, and the voltage controlling means: The deviation is integrated, and the integral value is further integrated proportionally, and the active filter receives a voltage obtained by subtracting the output voltage command input to the voltage control means from the output voltage of the AC/DC conversion means. A particle accelerator characterized by: