JPS5935596A - Controlling method for current of power converter - 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] [Technical Field of the Invention] The present invention is applicable to, for example, 'Intoxication! When driving a load such as a 111J machine, variable γIL pressure and variable frequency 1M, power and force converters such as inverters or cycloconverters are suitable as sources, and in particular, multi-phase power is used as the setting command input of C1. A multi-phase alternating current flow supplied to the load, a power conversion device that does not cause phase difference or amplitude error between the flow and the flow [4-
This invention relates to a current control method.

[Technical background of the invention]

When a power conversion device such as an inverter or a cycloconverter is used to supply AC current of the township frequency to the load f, the current output value for the power conversion device i# + 9 freighter 1
It is known that phase, optical, and amplitude errors occur between the current and the current. In other words, this is the 5 flow control 4M diagram of the conventional Zycro converter.
h. Explain the problems of the flow control method.

The figure shows an example in which a cycloconverter is used to supply one flow of three-way flow oil to a load (two flows. 101 digits tb, a flow amplitude setting device, and a 0103 digit load that sets the rear width command value l'). This is a setting device for the frequency of the alternating current to be used, and sets the 101 voltage V71 (frequency command) equivalent to the output frequency.

Reference numeral 100 denotes a command device, which generates a current command to a power conversion device IO, which will be described later. 105 is a coefficient multiplier which multiplies the amplitude command value Y by K1. Reference numeral 106 denotes a frequency converter which inputs the frequency command value voltage V7i and oscillates a pulse frequency bar' proportional to the target output wave number. It is a 109-digit counter that counts the pulse frequency f\' and generates a digital value signal θ\1 that goes around in one cycle of the output frequency. This is the phase angle of the current. 111 is a function unit, input the phase angle 0￥1, and output the three-phase current command LYo of unit sine wave.
' Generate LYw. That is, YU~LτW expression (1
) can be expressed as

Note that the function unit 111 in FIG. 1 used in the following explanation,
Function unit 316 in FIG. The configuration of the fifth function unit 454 is a well-known read-only memory (so-called ROM).
) is basically the same as 11. When a digital value is input to that address, the function value of the digital value generated in advance is output, and the function value of the digital value is directly displayed on the analog 1. Assuming something that outputs 7
ing.

Reference numerals 116, 117, and 118 are hooks that multiply the unit current command LYU-L1w by the output ( ) J of the coefficient unit 105 to generate an alternating current command Liu -L1'+v. That is, LγI
J-L\W is the formula % Formula % 10 is a tL power conversion device, which supplies a polyphase current to the load based on the alternating current command υ~L'7yl2 received from the command unit 100. 200-bound control circuit.

201 to 203 comparators, which calculate the AC current command value L ``'' IN and the extracted load currents tAr and Llu −'hvq, respectively, with the polarities shown in the figure, as will be explained later. Compare and create error 11υ~e1w.207~
209 is an amplifier, which amplifies the above-mentioned errors εlυ~εIw to generate AC voltage commands vttl~v1 050
It is a cycloconverter with AC voltage command VTTF
~ Three-phase AC voltage 111υ ~ νIw indicated by vl'I
occurs. 600 is three-phase protection 1! It is a load such as a motor, and has windings U, V, and W. Three-phase AC voltage νl
When υ~vlW is applied to a load of 600C, a corresponding load current Llυ~LIW flows. 5161517
．． 518 Fi current detector #7, load current ↓IU ~
↓ 1W is completely detected and load frost occurs, flow signal LIu = LI
w (using the same sign as the current flowing to the load), and these are fed back to the comparators 201 to 203 described above.

In the conventional device configured in this way, the alternating current command L"fu - monument w output from the command unit 100 is an alternating current amount, and this is matched with the load current detection value Ju - Alw of the alternating current amount to perform current control operation. is being carried out, resulting in a load of 6
00, a load current Llυ to L1g corresponding to the AC current command; 'TU-4Yw flows (however, in a cyclone inverter etc., a ripple component is included, but this is ignored).

In addition, in the 47g1 power converter shown in Fig. 1,
In practical use, it is impossible to convert unless the neutral point 02 of the load 600 and the neutral point 01 of the cycloconverter 500 are connected.0 Now, the input to the command unit 100, that is, the amplitude command value
1 frequency command m V'h and its output AC current command 'Y
u ~”Ww (and load 1! flow”xu −LxXv
) will be explained with reference to FIG. In Figure 2, 0■ [Yes] is the load 6000 winding position, and the current given by formula (21) ``i'u'' LYw (Here, IC No. 1 with the honor mark removed actually flows to the load. When a box 5 current or 'pressure component -) flows, the composite vector of those currents 1 (this is also referred to as the space vector of current) IY
Then, its width (absolute (lfj) is one foot in IY, its phase angle (measured from the winding O) is θ￥1, and it becomes a vector rotating at a constant speed. Commanding the flow to the three phase AC negative lights 1-1 First, set the flow vector ?l'' and divide this into a polyphase AC command)9
I know what I need to do if I finish it. The above-mentioned command device 100 is constructed based on this idea. That is, the loss margin command Y in Figure 1 and the length of the current vector EYLy in Figure 2 are specified, and the phase angle θ\1 in the command unit 100 is the current in Figure 2, and the rotation angle of vector 77. 0 this work l and θ”
Let lx be the element 1m, L, and use the function unit 111 in FIG.
) multi-phase (three-phase in the figure) unit current command LYU-Lte・N
is generated and its amplitude is adjusted by multipliers 116 to 118, thereby generating polyphase alternating current commands L1υ to AYW according to equation (2). Note that the configuration of the command device 100 shown in FIG. 1 is not unique, and this configuration is used to simplify the explanation of the invention described later. [Four points of background art] In the power converter shown in FIG. 1 configured as above.

The current command L7U-Li1q of the alternating current amount and the main flow rate Q load current Llυ~L1w are compared, and the deviation g1υ~εIw
.

(In other words, this deviation is also an alternating current amount) is the performance instrument 207-2
Calculated and controlled in 09)l? 11 It's the so-called AC 71 control system that makes you feel itchy. As is well known, in a closed-loop control system to which an alternating current amount command is given, the transfer function of the control system is related to the sign two, but in general, phase and amplitude errors (even in steady state) occur between the command value and the actual value. It is known that these v running differences increase as the input frequency increases (in other words, in a configuration roughly as shown in Figure 1, in one loop of flow control, the general constant deviation can be completely converted to C In the conventional current lu control method shown in Fig. 41, when a cycloconverter is installed in the power converter, the load current includes a ripple component, so the configuration of the amplifiers 207 to 209 is C double alternating current 11. subject to constraints and, as a result, increasing the output frequency. flow command value and 9. The phase error between the load and the current,
The difference in amplitude l has become unacceptably large, causing a problem. In particular, by using the i+t power converter of the buikro converter as a variable frequency source,
Torque control operation has recently become popular, but power converters for such purposes are An essential condition is that the output current can flow. Therefore, the polymorphism 'I
The emergence of a current control method for the force converter that does not cause a 1 amplitude difference and 1 phase error between the set value command input of JI tAt and the multiphase current actually supplied to the negative If. was strongly desired.

[Purpose of the invention]

Therefore, the object of the present invention is to use a power converter @: to calculate the load (two multiphase currents), and when supplying current, problem 1- arises, the set value of the multiphase current and the polyphase actually supplied to the load. It is an object of the present invention to provide a current control method for a power converter that can completely eliminate at least one amplitude error and one phase error between the alternating current and an alternating current in a steady state, and also enables quick transient response.

[Summary of the invention]

In order to achieve this object (2), the present invention has been made by focusing on the following points (2).In other words, in the above-mentioned AC control system, the deviation between the command value and the actual value is generally , cannot be made zero, but by giving the command value of the DC flow rate to the command value and comparing it with the actual value of the DC current that has been fed back, the error M° is amplified and the control operation is performed. In the so-called DC control system that performs this, a technique is applied that can completely reduce the steady-state deviation to two by avoiding the use of an amplifier g and two integral elements that amplify the predetermined difference.

EXAMPLE Below, the current control method of the power conversion device of the present invention will be explained using Fig. 3. Figure 3 shows a three-phase load 600 with a three-phase alternating current.
This is an example of supplying current, and the configuration is assumed to be the aforementioned power conversion device for vector control, which is expected to be developed in the future.

First, its configuration will be explained. Figure 3 and the markings described in f4Q,
In Figure 1, the numbers replaced by (;t) have the same effect, so their explanation may be omitted.

In FIG. 3, reference numeral 101 is a first wave amplitude setting device for setting the first amplitude standard Y. There are 103 frequency setters below, which set the voltage V71 equivalent to the output frequency.

Reference numeral 150 denotes a command device, which generates a command value to the power conversion device 20. 153.154 The cosine ψ￥1 of the current angle ψTl, which will be described later. It is a coefficient multiplier with a coefficient of sine sin ψYl, and as will be described later, the first axis component of the command current vector sent to the rotating seat thread is the first axis frost and flow standard of kJjl and t51. Y, and the second axis component, that is, the first yuzu 2
Outputs the shaft turtle flow reference work Yβ. That is, Engineering Y. , l7pr
J formula (can be expressed as 81.

157 is a voltage/frequency converter that inputs the voltage v71 of one frequency command value and oscillates a pulse frequency fY' proportional to the target output frequency.0159Fi is a counter that counts the pulse frequency fY' and outputs it. C2. Generates a digital value signal θM that goes around in one cycle of the output frequency. That is, Off'2 is the phase angle of the first axis of the rotating coordinate system described later, and the first phase angle 0'20 is the N1 power conversion device that employs the current control method of the present invention, and It receives the inputs Ya, Yβ and 0M and supplies three-phase alternating current to the load. 300 is a control circuit. 301 is a first first axis comparator;
As will be explained later, the load TM in the rotating coordinate system is derived from the detected load current Llυ~L1w, and the first axis component of the current vector, that is, the first The shaft current actual gap value 11α is compared with the actual gap value 11α, and an error thereof, that is, a first first axis error εla is created. Compare the quasi IYβ and the load 1. The second axis component of the flow vector, that is, the first 21111' current actual value 11β. a first first-axis computing unit;
Calculate the first profit 11 error εlα and calculate the second
', IA, "ji'; - creates semi-engineering γ0'. 31
0 is a first 2nd Illll computing unit which calculates the first 2nd axis error 61β and calculates the second 2nd axis flow reference IWa.
Create β.

350 is an 11i1J control circuit, the fake company 1 of which is shown in FIG. In Fig. 6, 352 and 353 are hanging fishing vessels, and the second 1st axis current reference work Yoα, Ki 2
Square the second axis current reference work Yoβ, and calculate the work Yoα
, ■Does not create YOρ. 354 is an adder,
Add Off and ■YOβ. It is a 356-digit function vector,
The input value is square root [7], which is reached later, but outputs the amplitude of the complementary first-flow command vector IYo, that is, the second width reference work ¥0. That is, it can be expressed by the equation (4).

Engineering Yc= J engineering Yza, + Po β (4) 360
is a divider, which divides the second 2nd axis current reference work Yoβ by the second 1st axis current reference work ¥Qa. 362 is a function unit, which takes the arctangent of the input value and calculates the phase angle of the corrected current command vector YO, which will be described later, with respect to the first axis, that is,
A second current correction angle ψ110 is output.

That is, ψIIO can be expressed by equation (5).

3644'i: Analog/digital converter, which converts the analog value signal ψIt○ into a digital value signal. Multiply by N1. 3141d is a first adder, which adds the first phase angle θM and the second correction current angle ψIIO to obtain correction ttAr and command vector? , o with respect to fixed coordinates, ie, a second phase reference θ\1o. That is, θf'lo is the formula (6)% Formula % 316 is a function unit, and the second phase reference value, θ\
Input lo, the second value of unit sine wave, flow command value OU+
'EOV + 'EOW is generated. That is, sOU
~TYOW can be expressed by equation (7).

θ￥10” Moromi+ψIIOL61 320~322i, i multiplier, 1u flow command value Tτ0υ~: 'row and the output signal of the coefficient unit 305 are multiplied by Shift, 3rd Oki, flow command value monument. υ、LYOV+monument ot
make v. That is, Table 1 is filled out using the aou-law B formula (8).

This third current command value "fo u-monu..." is the first
This corresponds to AC ilJ and diversion orders LτU to LIX'l in the conventional current control configuration In shown in the figure. The configuration and operation of the control circuit 200 and the power converter 500 are exactly the same as the parts with the same numbers in FIG. 1 of the conventional method, and the explanation will be omitted. However, when using the current control method of the present invention, unlike the conventional method shown in FIG. 1, the neutral point 02 of the 9L load 600 and the neutral point 0-1 of the power converter are separated and operated The load current Llυ~LIW detected here is fed back to the control circuit 200 and is also fed back to the detector 450. A detailed diagram of the detector 4500 is shown in FIG. 5C. In FIG.
W is input, and as will be described later, is divided into a first axis component L16 and a second axis component LlfP in a fixed coordinate system of the load current vector. That is, the detection load itt flow Ll
If υ~'Iw can be expressed by equation (9), then equation (101
) At t, the first axis component Lld + the second axis component L1g
, is required.

Next, 454 is a function unit, and the above-mentioned first phase angle 0π
is input, and a unit sine wave L1"o'"%o is generated.

That is, ;, rdo, and LTl can be expressed by formula 01).

457 to 460 are multiplications and containers, and the above-mentioned 'ld+L1+7-+LI'ao,'T9.0 multiplication is performed, respectively. 456.467 is an adder (1) which adds the output signals of the carriers 457 to 460 with the polarities shown (7).
, respectively, the first axis component in the rotating coordinate system 82 of the load current vector, that is, the actual value of the first axis current 1n, the second axis component, that is, the first second axis city; 171+,
The actual crafted lβ is output. That is, engineering 1a and engineering 1β can be expressed by expressions.

The obtained I 1 a+factor xpFi is guided to the control circuit 300 described above. The above is the configuration of the current control system to which the present invention is applied. Next, the operation will be explained. First, the relationship between the signals mentioned above will be explained.

In FIG. 2, the three-phase current command L? given by equation (2)? When υ~41w is synthesized, the cvL flow vector er is synthesized as shown in the figure, and this vector has a constant length of r and rotates with a phase angle of θ￥1. Regarding the fact that the rotation vector C2 becomes Continued. Therefore, it is clear that as a current command for multi-phase currents, there is no need to give individual current command values corresponding to individual phases, and it is sufficient to simply designate the current and vector Y all at once. FIG. 4 shows the state between each signal. Symbols in FIG. 4 that are the same as those written in other drawings represent the same number 16. Fourth
In the figure, ■ ~ [with] is the winding position of the load. dEI-j
1-8 is a fixed coordinate system in which the first axis dB is fixed to the U phase of the load winding, and the second axis fB is perpendicular thereto. α
-β is a rotating coordinate system whose first axis α is fixed to the first first axis current reference [Four rules for the frequency] 1. If it rotates, it will writhe.1) The second axis β is taken in the direction of the first axis. Let θτ be the phase angle between the 11111th rotational coordinate system and the negative winding U phase, that is, the first phase angle. This phase angle Oif ld is i in Figure 3.
This is the output of the t counter 159. Is it set up like this? (71
In the H coordinate thread, the command '11L flow vector IY is the first axis component of the rotating coordinate thread, that is, the above-mentioned first 1st axis current reference Ete α and the 24-11th component, that is, the % Il) Second
The second axis current reference IYβ is decomposed into 1st, and these values are 11. It becomes a flow. If the angle between the current, vector ■te and the first axis α is the current angle ψh, then 6Q, Yβ, Y,
There is a relationship between ψYl and equation (81), and this relationship is created by numbers 101, 153, and 154 in Figure 3. The phase angle from is ('L).

Also, the current vector E is negative IJ, V! , W is projected onto the external line, the current current Mf in the conventional diagram 1 becomes the command "YIJ -ir\w1-," but the kneading is given by equation (2).

The two-phase unit sine wave of the first phase angle θn in FIG. 4 is generated by the lIA multiplier 454 in FIG. 5, and is calculated by equation (11).

Regarding the other two signals C in FIG. 4, Ii
Returning to FIG. 3, the first 1st axis current reference value x7a of one current from the command unit 150, the first 2nd axis current reference value Yβ and the %1st The phase angle θo' is output, and these are given as current commands to the power converter @ 20, and based on this command, 3 ((] AC 1) fi current is supplied to the load 600. The operation is as follows. First, in the detector 450, as explained in FIG. Using the first phase angle θo8 in FIG. 4, internal processing is performed that can be expressed by the equation (id) (11) (+21) described above.

As a result, the first first axis current, the gap 11a, and the first second axis current actual value lρ are obtained. This 11a, 11
β is the 111% C component (i.e. 11a) and the second
It is nothing but the axial component (i.e., lp). Therefore, Ila,
The current becomes the DC phase. The detectors Ila and Iβ are connected to the comparator 301.3 as shown in the 3rd j * 11th unit.
Guided to 09. That is, in the first first axis comparator 301, θ
The component of the first axis in the rotational coordinate of the current vector 18 of the command shown in FIG.
W and the component of the first axis of the load current vector El, that is, the first
1st +lI! The actual 11a engineering lα is compared,
1σ is 1−, the first first axis error glα of the set is borrowed.

In the first second axis comparator 309, R<
211it+component, μII, silk 1 second axis current reference back ρ and 7. The second axis component of , that is, the first second axis error εlβ of θICli4 of 1υ1 is obtained. This error εlα,g
1β is calculated using the calculator 303.310 as the first and second 1st axis current reference IYOff + 2nd 2nd axis current reference, ^(
・The quasi-engineering Yoβ is found, but t) 1, the engineering YQa, the engineering YOβ
As shown in FIG. 4, it is a rotation in the rotating coordinate system, and its composite image is the command vector E\C and M, irze, ru in Figure 7. Garijo, arithmetic unit 30:
(,310 P1 amplifier (proportional/reduction), and tX is generated, so for the direct current command 11, the deviation can be made completely zero.Next, the second 1st axis current Standard IYo
a' 1 Second 2nd axis current reference work〒0β is control circuit 35
Guided into 0, the aforementioned # in this! Processing as explained in FIG. 6 is performed. That is, in Fig. 6, the formula (4
) is processed, resulting in the correction 'li,
The amplitude of the flow command vector ITo, ul'', that is, the second amplitude reference Ete〇 is obtained. Also, number 360.36 in Figure 6
2. The processing Jli of equation (6) is performed through the obscene of 364, and as a result, the rotation of the vector EYo in FIG. ψ
Xlc is obtained.

This ψ110th digit 3rd and 1st force adder 314 is used for the 1st digit 4 (
The second right-hand phase reference θ\l is added to the I angle θM and can be expressed by the formula (61).

In FIG. 4, this is the angle formed by vector E◯ and the U-phase winding of the load. Next, input the second phase reference value θLo, and calculate the second iT(, flow command・1oυ~Tteaw is generated) based on equation (7)(2) using the digitizer 316. :”)L Y'4 :(20-3221”
L b Ite coefficient unit 305 The second amplitude reference value light multiplied by K1 (the value ○ is hanging)11. As a result, the formula (81C,
The third knowledge flow command "i'ou~'Wow" is generated, and this relationship is also shown in Fig. 4, and is 〇, that is,
The third current commands LToυ to L'i'CXV are obtained by decomposing the corrected current command vector control 0 into loads u, V, and W, and are three-phase AC fh and flow commands. This third
The current command LYou -L'7o:v l; 207 to 209, the voltage command value I) iU
-v￥W made J. Voltage command value? υ～v71y+
: Based on this, the power converter 500 is controlled by fIi to generate three-phase sound voltages 111U to IIIW, and negative ai 'Rf,
Flow LIU -'IW or iAf, t"Iru. Through, 3rd
In the figure, computing units 207 to 209 are P amplifiers (proportional)
Finally, the arithmetic units 303 and 310 are PI amplifiers (
(proportional/integral).

The above is a clear explanation of the internal operation. With this configuration, if the current vector IY of the command, the current vector IY of the load, and the current vector El are
(If a two-phase, amplitude error occurs, the L amplifiers 303 and 310 in FIG. Until the first second axis error 61β becomes completely zero f2, the correction V in FIG. , second phase reference value) is modified, i.e., the third 111 flow command value "lOU~
LBow is corrected, the load current L1υ゛~LIW changes -2, and as a result, Et = Et, θ\1 = θII, so → → The vectors Y and 11 in Fig. 4 completely match C-
Become. In other words, in the case of the command current vector IY4'''Jg3, the conventional three-phase alternating current command L'fu -Li%vI:l in Figure 1
-#+ value, and the electric charge current vector EL is the current actually flowing into the load! Since these AC current commands LYt + + LIW are the same as IU "" LIW,
Although the load currents Llυ~L1w are AC, their phases and amplitudes completely match C. However, since the error εlalεlβ is always detected as a DC flow, regardless of the output frequency, , it is possible to completely match the current command value and the actual load current. Therefore, the current control method of the present invention can completely overcome the drawbacks that appeared in the conventional one-current control method shown in FIG.
In the explanation of the figure, a command unit 150 is installed, and 1 unit 6 + L amplitude command unit 1 is used as two component costs. , engineering Yβ1
7 is the sum of the three figures of the present invention ζ2. , using the force conversion device 20 to transform the load, which is the visiting electrician, M into a vector + 1III
? It is configured to operate at i11. In Fig. 7, 30 is a rotation speed setting device that commands the rotation speed ωr (5, at this speed,
Rotate. 314-1 is a so-called vector controller, which calculates the rotational contribution ωr of the tachometer 610, the above ω'9, and various foot numbers, and from this calculates the first current reference value IY of the first river 11. The first phase angle θr is now given.In other words, in vector control, in the 4th block 1, the engineering Y, the Kei 2Jt army, the motive Rokuto Oki, and the flow command E). YfF is the torque value rAr, the command value, the result of which is the commanded stator 'Ll'l; the flow vector and the slope S II are the actual stator t to be established.
lf', I/It, is a vector. Of course the phase angle is 00
9゛ is also given. In vector control, the commanded cloth first flow vector error r and the actual %i: tAF.

The key point in control is to make the vector rl perfectly match C, but for details on this point, if necessary, refer to IFiFIK Vol. IA-16, No. 3, Journal of the Institute of Electrical Engineers of America.
MAY/JUNK1980, P342-350 (Since they are repeated twice, the explanation will be omitted here. Therefore, the power converter 20 in FIG. Based on this, the control described above will be performed.

〔Effect of the invention〕

As explained above, according to the present invention, a load C is
When supplying two-phase alternating current (two problems), the phase error between the set value of the multiphase current and the multiphase alternating current actually supplied to the load (one phase error) can be completely eliminated ( Therefore, when vector control operation of an electric motor is performed using a power conversion device that employs this current control method, control stability can be improved.

[Brief explanation of the drawing]

Figure 1 is a block diagram of a power conversion device that employs a conventional current control method, Figure 2 is a diagram for explaining the relationship between multiphase currents and a current vector that is their composite value, and Figure 3 is an i FIG. 4 is a configuration diagram of a power conversion device that employs the current control method of the present invention, and FIG. 5 is a relationship diagram of each signal for explaining the current control method of the present invention.
The figure shows details of the detector 450 in FIG.
This figure is a detailed diagram of the control circuit 350 in FIG. 3, and is a block diagram when the tar electric motor is operated by vector control. 30... Rotation speed setter 31... Vector controller 101... Current amplitude gain 103... Frequency setter 150... Command unit 20... Box, force conversion device 300...・tl+control circuit 350...ff
i! I control circuit 450...detector 200...control circuit 500...cycloconverter 516-518...current detector 600...load 6
10...Rotation side

Claims (1)

[Claims] (]) 'I'j flow command is Kaera fl, its city, flow command l2 based on 111. In a power conversion device in which a force conversion device f is controlled and a multiphase alternating current according to an 11L flow command is supplied to a multiphase negative, the multiphase alternating current is
41 axes. 2nd Il:lII] as a space vector expressed in a rotational ordinal system, and as bl that commands the current command value of this space vector, the rfl phase is set on the first axis of the rotational coordinate system of the vector. 1, the 1st axis current reference value, and the 21st axis current reference value.
11+ is given the first phase angle η of the same phase, the flow reference value, and the first phase angle of the phase angle with respect to the fixed coordinate of the rotating coordinate system to detect the multiphase load. previous n1
of the load m flow vector in the two-rotation coordinate system representation. 611, the first axis current in phase with the first axis is actually 6,
Detect the actual value of the first and second axis currents that are in phase with the second axis, and
rrA first 1st axis comparison performance is performed between the 1st 1st axis heavy current reference value and the 1st 1st axis current actual value, and based on the calculation result? Determine the first axis current reference of 4I2, perform a first second axis comparison calculation between the first second axis current reference value and the first second axis current actual value, and from the calculation result C2. determining a second axis current reference of IIP 2, and calculating a second loss width reference and a second corrected current angle from the second first axis current reference and the second second axis current reference; t, , the first phase angle and the second
By adding the correction button and the flow angle, the second phase shift: quasi is derived,
A third multiphase current command to the multiphase load is derived from the second phase reference and the second amplitude reference, and the third current command of the multiphase and the detected multiphase load η1, the current Comparison operation is performed on the corresponding individual phases, and the result of the operation is used to calculate the polyphase city,
1. A current control method for a power conversion device, comprising: deriving a pressure command, and controlling the current of a multiphase load by adjusting the output voltage of a frost-to-force converter based on the pressure command arc. Minoru) Synchronize the rotating coordinate system of 211'l11 with the frequency of the first axis current reference and rotate i(j
The first scope of the patent request is based on the ordination system and is characterized by
A current control method for a power conversion device described in Jli.