JPS62201059A - Phase control circuit of self-arc-extinguishing-type 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] [Industrial Application Field] The present invention relates to a phase control circuit for a self-extinguishing power converter, and particularly to a self-extinguishing power converter suitable for high-speed phase control of a converter. The present invention relates to a phase control circuit for a converter.

[Conventional technology]

GTO (gate turn-off thyristor).

Power conversion devices using self-extinguishing elements such as transistors can perform commutation operation at any time, so the control delay angle can be reduced to 0.
It can be changed from 360 degrees to 360 degrees, and
It is also possible to suddenly change the control delay angle. Therefore, application to power system stabilization devices and the like is being considered.

In order to operate such a self-extinguishing power converter, the control delay angle must be controlled within a range of 0 degrees to 360 degrees.

A phase control circuit for a self-extinguishing power converter that enables sudden changes in the control delay angle is essential.

For this reason, the Institute of Electrical Engineers of Japan, Semiconductor Power Conversion Study Group Materials (SP
C-84-77), the basic circuit is a phase control circuit for a thyristor converter, and the circuit has expanded functions so that the control delay angle can be varied in the range of 0 degrees to 360 degrees. It is being considered.

[Problem that the invention seeks to solve]

However, the phase control circuits that have been considered in the past are based on circuits for thyristor conversion devices, and therefore cannot suddenly change the control delay angle.

However, when a self-extinguishing power converter is applied to a power system stabilizing device, a sudden change in the control delay angle becomes an essential function in order to avoid a system fault.

An object of the present invention is to provide a phase control circuit for a self-extinguishing power converter h1 that can control a control delay angle in the range of 0 degrees to 360 degrees and can suddenly change the control delay angle. It is in.

[Means for solving problems]

The present invention synchronizes with the voltage waveform of an AC system and has a phase angle of 360 degrees.
The difference in magnitude between the waveform with a period of 111 degrees and the signal that specifies the operating phase of the 111 force converter is determined, the difference can be determined at any time, and the power converter is adjusted according to the value. The element to be turned on (or turned off) is determined.

That is, one aspect of the present invention is a self-arc-extinguishing device that creates a gate pulse for each of the self-arc-extinguishing elements in response to a phase control signal that specifies the operating phase of a self-arc-extinguishing power converter that is constituted by self-arc-extinguishing elements. In a phase control circuit of a type power conversion device, a means for generating a synchronization signal having a cycle of 5 phase angles of 360 degrees in synchronization with a power waveform of an AC system, and control based on a difference in magnitude between this synchronization signal and the phase control signal. The device is characterized by comprising means for determining a phase angle signal, and means for generating a gate pulse for the self-extinguishing element to be turned on or off in response to the control phase angle signal. be.

[Effect]

According to the configuration of the present invention, the synchronization signal generating means generates a synchronization signal with a period of 360° phase angle in synchronization with the voltage of the AC system, and uses the synchronization signal with a period of 360° as a reference to generate a self-extinguishing signal. A difference signal from the phase control signal given to the power conversion device is determined.

The difference signal has content as a phase angle signal to be controlled, and since a gate signal corresponding to the content is given to each element of the self-extinguishing power converter, one phase angle can be adjusted from 0° to 36°.
It is possible to control within the range of @ and also to change the phase angle suddenly.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1, 2, 3, and 4.

FIG. 1 shows a phase control circuit 5 and a GT to which the present invention is applied.
This figure shows the position of self-extinguishing power converters using O elements in applied equipment.

Rank JJ! L! The phase control circuit 5 controls the self-arc-extinguishing power converter 2
The phase is controlled according to the phase command operation amount C from the I control device 4. The self-arc-extinguishing power converter 2 includes GTO cables Gu, G
It consists of V, G-, GX, and GF-G2, and performs power conversion between the AC system 1 and the load 3.

Here, the gate circuit 6 receives gate signals Qx, Qu, Qy, Qv, G2 . When the gate signal is I (level) according to Q-, the corresponding GTO element is turned on.
a gate pulse Px that is turned off when it is at L level;
The six-phase control circuit 5 that creates Pu, Py, Pv, Pz, and P- detects the line voltage of the AC system 1 and generates the AC dε signal F.
an AC voltage detection circuit 7 (in this example, it detects the line voltage of the R phase and T phase), which outputs an AC signal F, and a sawtooth wave generation circuit 8 that generates a sawtooth wave W in synchronization with the AC signal F. Adder circuit 9 that calculates the difference between the copper tooth wave W and the manipulated variable C from the control device 614 and outputs it as a difference signal A. Judge the magnitude of signal A and select the judgment result as signal m 11 m l t m
8 g..., control judgment circuit 10 outputting as ms, and selection signal ml+ mQHm8+...
It consists of a signal generation circuit 11 for generating signals Q, , Qu, Q, , Qv, Qzt and Qw for specifying the GTO element to be turned on according to the signal generation circuit 11 according to ms.

Phase φ1 Circuit Operation FIGS. 2, 3, and 4 are explanatory diagrams of the operation of the phase control circuit 5, and illustrate the operation when the manipulated variable C is a value that specifies a control delay angle of 180 degrees. It shows. Figure 2 shows
The relationship between the voltage waveforms of the AC system R, S and 'I' phases and the AC signal F, sawtooth wave W, and operation European C1 difference signal A is shown in Figure 2. If it is as shown in (a), the AC m%F (R-T) will be as shown in Figure 2 (b), and the phase of AC bt F is 0.
degree time point t1. Synchronized with t2, the waveform of the sawtooth wave W becomes the second waveform.
Created as shown in figure (c), the value of the manipulated variable C (180 degrees)
Accordingly, the waveform of the signal A (W-C) shown in FIG. 2(d) is obtained. In FIG. 2, the magnitude of each signal W, C, A is expressed by a control delay angle, but in reality, it is a digital amount corresponding to the control delay angle. Hereinafter, the values of the signals W, C, and A will be expressed using this control delay angle.

Next, according to FIGS. 3 and 4, 1 judgment circuit]0. The operation of the gate signal generation circuit 11 will be explained.

FIG. 3 shows the magnitude of the difference signal A and the selection signal Tn1.

mQ, ......, me and gate signal Q□Q I
TF...

This figure shows the relationship between Qz, and according to this diagram, the magnitude of the difference (i number A is determined in units of 60', and the selection signal m 1 v m L +...・・・
, ms becomes H level. Furthermore, for the selection signal that has become H level, the gate signals Q u and Q
v.

...+Qz is determined 1 For example, when the magnitude of the difference signal 4) is in the range of 0°≦A <60', the selection signal ml becomes H level, and the gate signal Q u
.

Q, becomes ■(level. According to the above rules, Figure 2 (
Selection signal ml for difference signal A shown in d).

rrB,..., rrH and gate signal Q□
QV...

The waveform of Q2 is obtained as shown in FIG.

Next, the sawtooth wave generating circuit 8 in FIG. Specific circuits of the adder circuit 9, determination circuit 10, and gate signal generation circuit 11 are shown.

Sawtooth j) 5 n' (3 Fig. 5 shows a specific example of the tu tooth wave generating circuit 8. The oscillation circuit 12 that generates the clock oscillation signal k and the magnitude of the AC signal F determine the output at F2O. A comparator 13 which sets the signal r to 1 (level) and sets the signal r when F<0 to 14 level. It counts the clock oscillation signal k and
Binary counter circuit 1 that is reset at the rising edge of
It consists of 4. FIG. 7 shows the operating waveforms of this circuit. If the waveform of the AC signal F is as shown in FIG. 7(a), the output signal r of the comparator 13 is as shown in FIG.
b) At this time, the output signal W of the binary counter circuit 14 is the seventh
This results in a sawtooth wave as shown in figure (cl). Further, the height of the sawtooth wave can be adjusted to a value corresponding to a control delay angle of 360° by adjusting the oscillation frequency of the single oscillation circuit 12.

Figure 6 shows a specific example of the adder circuit 9, in which the manipulated variable signal C
Each bit CI+ Cat Ca, ......, cn
is inverted and τ11 Cl gτ8. ......, inverter circuit I Vie I V outputting as -co-0
z, I V3.・＋・＋＋＋ I Vn.

and I (level signal B is used as a carry bit, and each bit Wl, W2...IW of sawtooth wave signal W
n and CI, C2, Ca, ``'''' +
Cn and each bit of the difference signal A at, al, a
It consists of a full adder circuit 15 that outputs as ll+ """p 'lln. However, for No. 48 W, C, and A, W 1 + CI Hal is the most significant bit. With this circuit, A=W- I can achieve 〇.

FIG. 8 shows the difference No. 67 A of the adder circuit 9 with respect to the signals W and C in FIG. 2(c). In this waveform, the lower bits aet, ag, . . . .

A sawtooth wave with a height of 60° as shown in FIG. 8(b) is realized with an, and the upper 4 bits a I Ha 14 a 8. a4
This realizes the staircase waveform shown in FIG. 8(c). Namely.

The waveform in FIG. 8(a) is a composite of FIGS. 8(b) and (c). In this way, the upper 4 bits a
In the digital quantity consisting of l, al, ajl, and al, 1 bit corresponds to 60', and if the most significant bit is the sign bit, the waveform of each bit will be as shown in Figure 8 (d). , Therefore, based on the bit pattern of the upper 4 bits of the difference signal A, the range of the magnitude of the difference signal A can be determined in units of 60'.

The judgment circuit 10 in FIG. 9 uses the upper 4 bits of the difference signal A as an input signal.
This is a specific circuit of the judgment circuit 10 that implements the rules shown in FIG. 3, and is an inverter circuit TGJ.

TGz, IGa, IO2, AND circuit ANt, ANz.

......, ANzz and OR circuit ORs + O
R21...

It consists of ORa. In this circuit, for example, the upper 4 bits al, a2 . When all a21184 are at L level, the inverter circuit IGI.

The output signals of IGz and IGa become H level, and the output signal of AND circuit A N 1 becomes H level. Therefore, in this case, the selection signal m which is the output signal of the OR circuit ORI
1 is the H level.

Gate II! +11 Figure 10 shows 1 selection signals mt, ffl,...
ms as an input signal, and a gate signal QutQT1. ...
. . , is a specific example of the gate signal generation circuit 11 that outputs Qz, and is an OR circuit OR? , ORa,...
・,0Rsz. In this circuit, for example, when the selection signal m1 or mz is at H level, the gate signal Q
u becomes H level.

FIG. 11: Upper 4 pits l"al, ax of difference signal A.

This figure shows the operation of the determination circuit 10 in FIG. 9 and the gate signal generation circuit 11 in FIG. 10 when the waveform of a31a4 becomes as shown in FIG. 8(d).

Selection signal ml, m! , . . . , m8 and gate signal Q + Qv + . . . , Q71 are found to follow the rules shown in FIG.

FIG. 12 shows the operation of the phase control circuit 5 when the manipulated variable C changes stepwise) and the waveform of the DC output voltage ed of the self-extinguishing power converter [2] that changes accordingly. It is. In this example, the manipulated variable C is
), from 30@ to 150° at time ta,
Further, at time t4, there is a step change from 150° to 30'. On the other hand, the phase control circuit 5 is shown in FIGS. 1 and 2.

・・・・・・The response explained in FIG. 11 is performed, and the difference signal A is
(=WC) and the selection signal m 1 for it.

The waveforms of mz, """, and m6 are obtained as shown in Fig. 12 (b) and (c). Looking at Fig. 12 (c), the step change of the operation sensitivity signal C is instantly reflected, and the selection signal mt, m
It can be seen that the patterns of z, ``'..., m6 have changed. Therefore, the gate pulses Pu, Pv+, old, P2 of the self-extinguishing power converter 2 also change instantaneously, and the DC output voltage 8- , responds in steps as shown in FIG. 12(d).

Therefore, in this embodiment, the control delay angle is varied from 0° to 36°.
It is possible to perform control within a range of 0° and to suddenly change the control delay angle.

FIGS. 13 and 14 show other embodiments of the present invention, in which the sawtooth wave generating circuit 8° adder circuit', j in FIG.
The tII9 and judgment circuit 10 are realized by analog circuits using operational amplifiers.

Figure 13 shows a sawtooth wave generation opening 'JP by an analog circuit.
t16 and the configuration of the adder circuit 17, the sawtooth wave generation circuit 16 includes an operational amplifier 18 and a resistor 19.20.
a comparator 1Ejl circuit consisting of a comparator 1Ejl circuit, a differentiator circuit 21 that receives the output signal r of the comparator circuit and creates a differential waveform S of the signal r, an operational amplifier 22, resistors 23, 24, a capacitor 25 . It consists of an integrating circuit consisting of a transistor switch 26 for discharging the capacitor 25. In this circuit, as in FIG.
7, the output of the comparator circuit (No. The integrating circuit is reset every time the transistor switch 26 is operated according to the signal S. Therefore, by adjusting the size of the signal, a waveform corresponding to FIG. 7(d) can be created. can.

The adder circuit 17 includes an operational amplifier 27. Resistance 28°29.
Sign inversion circuit consisting of 30, operational amplifier 31, resistor 32
, 33, 34.35 and an operational amplifier circuit 36. It is constituted by a sign inverting circuit consisting of resistors 37, 38.degree. 39, and realizes the arithmetic expression A'=W'-C' for the manipulated variable C' in an analog case, and outputs a signal A'.

In FIG. 14, the magnitude of the signal A' is determined and the selection signals ml, ITIF, . . . + mg are determined according to the rules in FIG.
4 is a circuit diagram of a judgment circuit 40 that outputs an operational amplifier 4.
1,42. ......, 51, resistance 52, 53°...
......, comparator Jll consisting of 73, inverter circuit I G Fll I Ge+..., IG
II5, AND circuit ANLII, AN141...-
・+ANzi and OR circuit OR? ,0R11,...
..., 0Rz2.

Comparison reference signals Ll, L2 of the comparator group.・・・・・・
....

The values of Lll are 300°, 240°, etc., respectively.
....

-300', so that the magnitude of the signal A' can be determined in units of 60 degrees.6For example, if the value of the signal A' is in the range of 06≦A'<60', the operational amplifier 41 ,42. . . . , the output of 45 is at L level, and the output of operational amplifiers 46, 47 . ..., the output of 51 becomes H level. Therefore, AND circuit AN17 and OR circuit OR7 operate, and selection signal ml becomes H level.

The other embodiments described above can also provide the same effects as the above-mentioned embodiments.

〔Effect of the invention〕

According to the present invention, it is possible to realize a phase control circuit for a self-extinguishing power converter that can control the control delay angle within a range of 360 degrees from O'''' and can suddenly change the control delay angle.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an overview of the present invention, Fig. 2 is a time chart showing the operating waveforms of each part, Fig. 3 is an explanatory diagram showing the correspondence of signals of each IJ part, and Fig. 4 is a time chart showing the operating waveforms of each part. , Fig. 5 is a circuit diagram showing a specific example of a tooth-shaped wave creation circuit, Fig. 6 is a circuit diagram showing a specific example of an adder circuit, and Fig. 7 shows the correspondence between an alternating current signal and a sawtooth wave. Time chart. FIG. 8 is a time chart showing the correspondence of the difference signal to the sawtooth wave; FIG. 9 is a circuit diagram showing a specific example of the judgment circuit;
FIG. 10 is a circuit diagram showing a specific example of a gate signal generation circuit,
Fig. 11 is a time chart showing the correspondence of selection A, No. 1, and gate signals with respect to changes in the difference signal, Fig. 12 is a time chart of each part signal when the manipulated variable changes in a stepwise manner, and Fig. 13 is a time chart of other signals. FIG. 14 is a circuit diagram showing a specific example of the sawtooth wave generating circuit and the adder circuit in the embodiment, and FIG. 14 is a circuit diagram showing a specific example of the determination circuit. 1... AC system, 2... Self-extinguishing power converter,
3... Load, 4... Control device, 5... Phase control circuit, 6... Gate circuit, 7... Transformer, 8... Sawtooth wave generation circuit. 9... Adder circuit, 10... Judgment circuit, A... Difference signal, B... Complement calculation signal, C... Phase operation amount signal,
W... sawtooth wave signal, tnt~ms... selection signal,
Q8~Q,...Gate signal, P x "' P w・
...Gate pulse.

Claims (1)

[Scope of Claims] 1. A self-extinguishing device that generates gate pulses for each of the self-extinguishing elements in response to a phase control signal that specifies the operating phase of a self-extinguishing power converter configured with self-extinguishing elements. In a phase control circuit of an arc-extinguishing power converter, means for generating a synchronization signal synchronized with a voltage waveform of an AC system and having a phase angle of 360 degrees as a period; The device is characterized by comprising means for determining a control phase angle signal, and means for generating a gate pulse for the self-extinguishing element to be turned on or off in response to the control phase angle signal. Phase control circuit for self-extinguishing power converter.