JP2021111980A - Control apparatus of thyristor rectifier and control method - Google Patents

Abstract

To improve safety at the time of short-circuit failure of an element.SOLUTION: A control apparatus of a thyristor rectifier in an embodiment includes: reference phase detection means of inputting an AC side voltage of the thyristor rectifier, and outputting a reference phase of the AC side voltage; gate pulse generating means of generating a gate pulse signal on the basis of a predetermined thyristor control angle signal and the reference phase output by the reference phase detection means; and failure detection means of inputting both of the AC side current of the thyristor rectifier and a DC side current of the thyristor rectifier, respectively, detecting that the thyristor rectifier is in a failure when a difference current between the AC side current and the DC side current is the out of a predetermined range, and outputting a failure signal indicating this failure.SELECTED DRAWING: Figure 1

Description

Embodiments of the present invention relate to a control device and a control method for a thyristor rectifier.

An application example of the control unit of the conventional thyristor rectifier will be described. FIG. 5 is a diagram showing an example of a control device for a thyristor rectifier in the prior art. In this device, a fuse with an alarm contact is applied to the control unit of the thyristor rectifier.

As shown in FIG. 5, the AC power supply 1 is input to the thyristor rectifier 5 via the field circuit breaker 3 of the UVW phase (each phase) and the fuse 4 (4U, 4V, 4W) with an alarm contact of the UVW phase. NS.
The thyristor rectifier 5 includes U-phase thyristors (thyristor elements) 5U, 5X, V-phase thyristors 5V, 5Y, and W-phase thyristors 5W, 5Z.

The anode of the thyristor 5U is connected to the cathode of the thyristor 5X, the anode of the thyristor 5V is connected to the cathode of the thyristor 5Y, and the anode of the thyristor 5W is connected to the cathode of the thyristor 5Z. The anodes of thyristors 5X, 5Y and 5Z are common, and the cathodes of thyristors 5U, 5V and 5W are common. A load 6 is connected in parallel between the cathode of the thyristor 5W and the anode of the thyristor 5Z.

The fuse with alarm contact (for U phase) 4U is connected to the anode of the thyristor 5U, the fuse with alarm contact (for V phase) 4V is connected to the anode of the thyristor 5V, and the fuse with alarm contact (for W phase) 4W is the thyristor. It is connected to a 5W anode. As a result, the rectifier AC voltages VU, VV, and VW of each phase from the AC power supply 1 are converted into the DC voltage VD and applied to the load 6.

The control unit 15 as a control device for the thyristor rectifier includes a phase control unit 2 and an alarm unit 16. The phase control unit 2 outputs gate pulse signals PU, PX, PV, PY, PW, and PZ for firing the thyristor rectifier 5 in response to an external thyristor control angle signal α, and performs reference phase detection. It has a unit 2A and a gate pulse generating unit 2B.

The gate pulse signal PU is a signal for firing the thyristor 5U, the gate pulse signal PX is a signal for firing the thyristor 5X, and the gate pulse signal PV is a signal for firing the thyristor 5V. It is a signal, the gate pulse signal PY is a signal for firing the thyristor 5Y, the gate pulse signal PW is a signal for firing the thyristor 5W, and the gate pulse signal PZ is a point for firing the thyristor 5Z. It is a signal for arcing.

The reference phase detector 2A inputs the rectifier AC voltages VU, VV, and VW, and sets the point at which the line voltage moves from the negative voltage to the positive voltage as the reference point (reference phase), and sets the reference phase SU, SV of the UVW phase. , SW is output to the gate pulse generator 2B.

The gate pulse generation unit 2B inputs the thyristor control angle signal α and the reference phase SU, SV, SW from the reference phase detection unit 2A, respectively, and lags the reference phase SU, SV, SW by the thyristor control angle signal α. At the timing, the gate pulse signals PU, PX, PV, PY, PW, PZ for firing the thyristors 5U, 5X, 5V, 5Y, 5W, 5Z of the phase are output to perform the rectification operation.

The alarm unit 16 uses the logical sum of the blow signals FU, FV, and FW of each phase indicating whether or not the fuses 4U, 4V, and 4W with alarm contacts of each phase are blown, and the alarm signal AL indicating the failure of the element of the thyristor rectifier 5. Is output as.

The thyristor rectifier 5 outputs a DC voltage VD according to the timing of the gate pulse signals PU, PX, PV, PY, PW, and PZ output by the phase control unit 2. By this output, the load current ID flowing through the load 6 is adjusted to a desired value, and when the alarm signal AL is turned on, the field circuit breaker 3 is shut off and the operation of the thyristor rectifier 5 is stopped.

Japanese Unexamined Patent Publication No. 2009-268167 Japanese Unexamined Patent Publication No. 5-344707

In the prior art, when one element of the thyristor rectifier 5 is short-circuited and the fuse 4 with an alarm contact is blown, and the blow signals FU, FV, and FW are turned "ON" and input to the alarm unit 16. , The alarm unit 16 outputs an alarm signal AL to stop the operation of the thyristor rectifier 5.

For example, in a thyristor rectifier applied to an exciter of a brushless generator, when a three-phase uniform bridge configuration of 1S-1P-6A configuration is adopted, one element of the thyristor rectifier short-circuits and fails, resulting in one phase. When the fuse 4 with an alarm contact blows, the operation of the generator is stopped. However, in this case, a power failure of the power supply load and an adverse effect on the power system occur.

As a specific example, when the thyristor rectifier 5 is applied to the above exciter, when a short circuit failure occurs in the thyristor 5U and the fuse with alarm contact (for U phase) 4U is blown, the alarm unit 16 of the phase control unit 2 Stops the operation of the generator by outputting the alarm signal AL.

Further, in the actual operating state, the thyristor rectifier 5 may be operated with a large margin with respect to the current rating of the thyristor rectifier, and even if the element of the thyristor rectifier 5 is short-circuited, the fuse 4 with an alarm contact is short. It may not melt in time. If the fuse 4 with alarm contact does not blow even though a short-circuit failure occurs in any of the thyristor elements of the thyristor rectifier 5, the following problems may occur.

(1) Overheating / damage of peripheral equipment due to continuous overcurrent state (2) Occurrence of insufficient excitation state due to decrease in output voltage of thyristor rectifier 5 (3) Due to decrease in gain of thyristor rectifier 5 Deterioration of responsiveness of the control system Further, in the prior art, there is a technique of detecting a failure of one element of the thyristor rectifier and preventing the operation of the power converter from stopping. However, this technique relates to thyristor elements connected in series and cannot solve the above problem.

In response to the above problems, recently, there is a demand for continuous operation without stopping the operation while suppressing overheating and damage to peripheral devices even if one element of the thyristor rectifier fails due to a short circuit. In addition, even if one element has a short-circuit failure, there is a request to detect or display the failure by means other than a fuse with an alarm contact to ensure safety in the event of a short-circuit failure of the element. No means are known to achieve this.

An object to be solved by the present invention is to provide a control device and a control method for a thyristor rectifier capable of improving safety in the event of a short-circuit failure of an element.

The control device of the thyristor rectifier according to the embodiment is composed of a reference phase detecting means for inputting an AC side voltage of the psyllista rectifier and outputting a reference phase of the AC side voltage, a predetermined thyristor control angle signal, and the reference phase detecting means. The gate pulse generating means for generating a gate pulse signal based on the output reference phase, the AC side current of the thyristor rectifier, and the DC side current of the thyristor rectifier are input, respectively, and the AC side current and the DC It has a failure detecting means that detects that the thyristor rectifier has a failure when the difference current from the side current is out of a predetermined range, and outputs a failure signal indicating the failure.

According to the present invention, it is possible to improve safety in the event of a short-circuit failure of an element.

The figure which shows the functional structure example of the semiconductor power converter control apparatus which concerns on 1st Embodiment. The block diagram which shows the functional structure example of the failure detection part of the semiconductor power converter control device which concerns on 1st Embodiment. The figure which shows the functional structure example of the semiconductor power converter control apparatus which concerns on 2nd Embodiment. The figure which shows the functional structure example of the failure detection part of the semiconductor power converter control apparatus which concerns on 2nd Embodiment. The figure which shows an example of the control device of the thyristor rectifier in the prior art.

Hereinafter, embodiments will be described with reference to the drawings.
(First Embodiment)
First, the first embodiment will be described.
<Structure>
FIG. 1 is a diagram showing a functional configuration example of the semiconductor power converter control device according to the first embodiment. In FIG. 1, the same reference numerals as those in FIG. 5 indicate the same parts or corresponding parts, and the parts already described will be omitted.
Compared with the configuration shown in FIG. 5, the control unit 15 in the first embodiment is a thyristor rectifier current transformer of each phase between the AC power supply 1 and the fuses 4U, 4V, 4W with alarm contacts of each phase. 7U, 7V, 7W are provided on a one-to-one basis. That is, one thyristor rectifier current transformer 7U, 7V, 7W is provided for each phase on the AC side of the thyristor rectifier 5. Further, a thyristor rectifier current transformer 7D is provided between the cathode of the thyristor 5W and the load 6 on the output side of the thyristor rectifier 5. The thyristor rectifier current transformers 7U, 7V, and 7W output the rectifier AC currents CU, CV, and CW, which are the AC side currents of each phase of the thyristor rectifier 5, on a one-to-one basis. The thyristor rectifier current transformer 7D outputs the rectifier DC current CDH, which is the DC side current of the thyristor rectifier 5.

Further, as compared with the configuration shown in FIG. 5, the control unit 15 in the first embodiment further includes a failure detection unit 18, and an alarm unit 17 is provided instead of the alarm unit 16. The failure detection unit 18 is connected to the thyristor rectifier current transformer 7U, 7V, 7W, 7D and the alarm unit 17.

FIG. 2 is a block diagram showing a functional configuration example of a failure detection unit of the semiconductor power converter control device according to the first embodiment.
The failure detection unit 18 shown in FIG. 2 includes an alternating current detection unit 13, a direct current detection unit 14, a difference current calculation unit 12, an overcurrent detection unit 8D, and a holding unit 11D.

The operation of the failure detection unit 18 will be described.
The AC current detection unit 13 inputs the rectifier AC currents CU, CV, and CW, detects the full-wave rectified values of these currents, and outputs the rectifier AC current CAC, which is a signal proportional to these values.
The DC current detection unit 14 inputs the rectifier DC current CDH and outputs the rectifier DC current CDC, which is a signal proportional to the magnitude of this signal.

The difference current calculation unit 12 inputs the rectifier AC current CAC and the rectifier DC current CDC, calculates the difference current indicating the difference between the rectifier AC current CAC and the rectifier DC current CDC, and is proportional to the value of the difference current. The difference current CS, which is a signal, is output.

The overcurrent detection unit 8D inputs the difference current CS, detects the overcurrent of the thyristor rectifier 5 when the value of the difference current indicated by the difference current CS exceeds a preset value, and indicates this detection. The overcurrent failure signal (overcurrent detection signal) ES is output.

The holding unit 11D inputs the overcurrent failure signal ES, holds the overcurrent failure signal ES until the operation of the thyristor rectifier 5 is stopped, and then outputs the failure signal EA indicating the failure of the thyristor rectifier 5.

The alarm unit 17 inputs the failure signal EA and the fusing signal FU, FV, FW, respectively, detects the logical sum of the failure signal EA and the fusing signal FU, FV, FW, and outputs this logical sum as the alarm signal AL. do.

The AC current detection unit 13 may calculate the inflow current to which a positive value is added from the instantaneous values of the rectifier AC currents CU, CV, and CW and output the current as the rectifier AC current CAC, or the rectifier AC. The outflow current, which is the absolute value of the sum of the negative values of the instantaneous values of the currents CU, CV, and CW, may be calculated and output as the rectifier AC current CAC, or the rectifier AC currents CU, CV, A value that is 1/2 times the sum of the absolute values of CW may be output as the rectifier AC current CAC.

<Action>
The operation in the first embodiment will be described. For example, when the thyristor 5U is not short-circuited, the rectifier AC current CAC and the rectifier DC current CDC match, so that the overcurrent failure signal ES is turned off.

On the other hand, when the thyristor 5U has a short-circuit failure, an overcurrent occurs when another phase of the thyristor, for example, the thyristor 5V conducts (ignites) after the short-circuit failure. In this case, a short-circuit current flows from the V phase of the AC power supply 1 toward the U phase via the thyristor rectifier current transformer 7V, the thyristor 5V, 5U, and the thyristor rectifier current transformer 7U.

At this time, the value of the rectifier DC current CDC does not change significantly, but since the absolute values of the rectifier AC currents CU and CV increase sharply, the rectifier AC current CAC rapidly increases and the differential current CS is preset. The value is exceeded and the overcurrent failure signal ES is turned ON.
Since the overcurrent state is not continuous, the overcurrent failure signal ES is held by the holding unit 11D and output as a failure signal EA.

<Effect>
According to the first embodiment, even if the fuse 4 with an alarm contact does not blow in a short time even though one element of the thyristor rectifier 5 has a short circuit failure, the magnitude relationship between the rectifier AC current and the rectifier DC current is determined. It is possible to detect a failure of the thyristor rectifier 5.
Therefore, it is possible to suppress overheating and damage of peripheral devices due to the continuation of the overcurrent state for a long time.

(Second Embodiment)
Next, the second embodiment will be described.
<Structure>
FIG. 3 is a diagram showing a functional configuration example of the semiconductor power converter control device according to the second embodiment. In FIG. 3, the same reference numerals as those in FIG. 1 indicate the same parts or corresponding parts, and the parts already described will be omitted.
Compared with the configuration shown in FIG. 5, the control unit 15 in the second embodiment is a thyristor rectifier current transformer of each phase between the AC power supply 1 and the fuses 4U, 4V, 4W with alarm contacts of each phase. 7U, 7V, 7W, are provided on a one-to-one basis. Further, a thyristor rectifier current transformer 7D is provided between the cathode of the thyristor 5W and the load 6. The thyristor rectifier current transformers 7U, 7V, and 7W output the rectifier AC currents CU, CV, and CW, which are the AC side currents of each phase of the thyristor rectifier 5, on a one-to-one basis. The thyristor rectifier current transformer 7D outputs the rectifier DC current CDH, which is the DC side current of the thyristor rectifier 5.

Further, as compared with the configuration shown in FIG. 5, the control unit 15 in the second embodiment further includes a failure detection unit 19, and an alarm unit 20 is provided instead of the alarm unit 16. The failure detection unit 19 is connected to the thyristor rectifier current transformer 7U, 7V, 7W, 7D and the alarm unit 20.

FIG. 4 is a block diagram showing a functional configuration example of a failure detection unit of the semiconductor power converter control device according to the second embodiment.
The failure detection unit 19 shown in FIG. 4 includes an AC current detection unit 13, a DC current detection unit 14, a difference current calculation unit 12, an overcurrent detection unit 8D, and an outflow direction overcurrent detection unit corresponding to each phase. 8U, 8V, 8W, inflow direction overcurrent detectors 8X, 8Y, 8Z corresponding to each phase, and a logical product circuit (sometimes referred to as a logical product) 10U, 10X, 10V, 10Y, 10W, 10Z. It has holding portions 11U, 11X, 11V, 11Y, 11W, 11Z. The logical product circuit 10U, 10X, 10V, 10Y, 10W, 10Z may be collectively referred to as the logical product circuit 10. Further, the holding portions 11U, 11X, 11V, 11Y, 11W, and 11Z may be collectively referred to as the holding portion 11.

The operation of the failure detection unit 19 will be described.
The AC current detection unit 13 inputs the rectifier AC currents CU, CV, and CW, detects the full-wave rectified values of these currents, and outputs the rectifier AC current CAC, which is a signal proportional to these values.
The DC current detection unit 14 inputs the rectifier DC current CDH and outputs the rectifier DC current CDC, which is a signal proportional to the magnitude of this signal.

The difference current calculation unit 12 inputs the rectifier AC current CAC and the rectifier DC current CDC, calculates the difference current indicating the difference between the rectifier AC current CAC and the rectifier DC current CDC, and is proportional to the value of the difference current. The difference current CS, which is a signal, is output.

The overcurrent detection unit 8D inputs the difference current CS, detects the overcurrent of the thyristor rectifier 5 when the value of the difference current indicated by the difference current CS exceeds a preset value, and indicates this detection. The overcurrent failure signal ES is output.

The outflow direction overcurrent detectors 8U, 8V, 8W input the rectifier AC currents CU, CV, CW of each phase on a one-to-one basis, and when the current in the outflow direction with respect to the thyristor rectifier 5 exceeds a preset value. The overcurrent of the thyristor rectifier 5 is detected, and the overcurrent signals OCU, OCV, and OCW of each phase indicating this detection are output on a one-to-one basis.

The inflow direction overcurrent detectors 8X, 8Y, 8Z input the rectifier AC currents CU, CV, and CW of each phase on a one-to-one basis, and when the current in the inflow direction with respect to the thyristor rectifier 5 exceeds a preset value. The overcurrent of the thyristor rectifier 5 is detected, and the overcurrent signals OCX, OCY, and OCZ of each phase indicating this detection are output on a one-to-one basis.

Specifically, the overcurrent signal OCU is output to the AND circuits 10U, 10Y, 10Z, the overcurrent signal OCX is output to the AND circuits 10X, 10V, 10W, and the overcurrent signal OCV is the AND circuit. It is output to 10V, 10X, 10Z, the overcurrent signal OCY is output to the AND circuit 10Y, 10U, 10W, the overcurrent signal OCW is output to the AND circuit 10W, 10X, 10Y, and the overcurrent signal OCZ is , It is output to the AND circuit 10Z, 10U, 10V.

The fault detection unit 19 identifies the short-circuited thyristor element in the thyristor rectifier 5 by the logical product operation by the logical product circuit 10, and outputs the overcurrent failure signals ESU, ESX, ESV, ESY, ESW, and ESZ to the holding unit 11. ..

Specifically, the logical product circuit 10U inputs the overcurrent failure signal ES and the overcurrent failure signals OCU, OCY, OCZ, detects the short-circuited thyristor 5U by the logical operation based on the logical product, and detects this. The indicated overcurrent failure signal ESU is output.
The logical product circuit 10X inputs an overcurrent failure signal ES and an overcurrent failure signal OCX, OCV, OCW, detects a short-circuited thyristor 5X by a logical operation based on the logical product, and detects an overcurrent failure signal indicating this detection. Output ESX.

The logical product circuit 10V inputs the overcurrent failure signal ES and the overcurrent failures OCV, OCX, OCZ, detects the short-circuited thyristor 5V by the logical operation by the logical product, and detects the overcurrent failure signal indicating this detection. Output ESV.
The logical product circuit 10Y inputs an overcurrent failure signal ES and an overcurrent failure signal OCY, OCU, OCW, detects a short-circuited thyristor 5Y by a logical operation based on the logical product, and detects an overcurrent failure signal indicating this detection. Output ESY.

The logical product circuit 10W inputs the overcurrent failure signal ES and the overcurrent failure signals OCW, OCX, and OCY, detects the short-circuited thyristor 5W by a logical operation based on the logical product, and detects the overcurrent failure signal ESW indicating this detection. Is output.
The logical product circuit 10Z inputs an overcurrent failure signal ES and an overcurrent failure signal OCZ, OCU, OCV, detects a short-circuited thyristor 5Z by a logical operation based on the logical product, and detects an overcurrent failure signal ESZ indicating this detection. Is output.

The holding units 11U, 11X, 11V, 11Y, 11W, 11Z input the overcurrent failure signals ESU, ESX, ESV, ESY, ESW, ESZ on a one-to-one basis, and these overcurrent failure signals ESU, ESX, ESV, After holding the ESY, ESW, and ESZ until the operation of the thyristor rectifier 5 is stopped, the failure signals EU, EX, EV, EY, EW, and EZ indicating the failure of the thyristor element are output. The failure signals EU, EX, EV, EY, EW, and EZ have a one-to-one correspondence with the overcurrent failure signals ESU, ESX, ESV, ESY, ESW, and ESZ.

Specifically, the holding unit 11U outputs the failure signal EU using the overcurrent failure signal ESU, the holding unit 11X outputs the failure signal EX using the overcurrent failure signal ESX, and the holding unit 11V outputs the failure signal EX. The failure signal EV is output using the overcurrent failure signal ESV, the holding unit 11Y outputs the failure signal EY using the overcurrent failure signal ESY, and the holding unit 11W uses the overcurrent failure signal ESW to output the failure signal. The EW is output, and the holding unit 11Z outputs the failure signal EZ using the overcurrent failure signal ESZ.

The alarm unit 20 receives each of the failure signals EU, EX, EV, EY, EW, and EZ input from the failure detection unit 19 and each of the blowout signals FU, FV, and FW input from the fuse 4 with an alarm contact. Input, the logical sum of the failure signals EU, EX, EV, EY, EW, EZ and the fusing signals FU, FV, FW is detected, and this logical sum is output as an alarm signal AL.

The AC current detection unit 13 may calculate the inflow current to which a positive value is added from the instantaneous values of the rectifier AC currents CU, CV, and CW and output the current as the rectifier AC current CAC, or the rectifier AC. The outflow current, which is the absolute value of the sum of the negative values of the instantaneous values of the currents CU, CV, and CW, may be calculated and output as the rectifier AC current CAC, or the rectifier AC currents CU, CV, A value that is 1/2 times the sum of the absolute values of CW may be output as the rectifier AC current CAC.

<Action>
The operation in the second embodiment will be described. For example, when the thyristor 5U has a short-circuit failure, an overcurrent occurs when the thyristors 5V and 5W are electrically connected (ignited) after the short-circuit failure. In this case, the rectifier AC current CU from the thyristor rectifier current transformer 7U is input to the outflow direction overcurrent detection unit 8U, so that the outflow direction overcurrent signal OCU is turned on in the U phase, and the thyristor rectifier current transformer 7V. , The rectifier AC currents CV and CW from 7W are input to the inflow direction overcurrent detection unit 8X, so that the inflow direction overcurrent signals OCY and OCZ are turned on in the V phase and the W phase.

At this time, since the overcurrent failure signal ES is also turned ON, the logic product circuit 10U outputs the U-phase overcurrent failure signal ESU ON as the logical product of the overcurrent failure signal ES and the overcurrent signals OCU, OCY, and OCZ. Then, the failure signal EU is turned on via the holding unit 11U. Since the overcurrent state is not continuous, the holding unit 11U holds the U-phase overcurrent signal OCU and outputs the failure signal EU.

<Effect>
According to the second embodiment, even if the fuse 4 with an alarm contact does not blow in a short time even though one element of the thyristor rectifier 5 has a short-circuit failure, the magnitude relationship between the rectifier AC current and the rectifier DC current The failed thyristor element can be detected from the relationship between the inflow phase and the outflow phase of the overcurrent due to the element failure. Further, the information of the detected element may be displayed by a display device (not shown).
Therefore, it is possible to suppress overheating and damage of peripheral devices due to the continuation of the overcurrent state for a long time.

According to each embodiment, a control device for a thyristor rectifier and its control capable of suppressing overheating and damage to peripheral devices even when a fuse with an alarm contact does not blow despite a short-circuit failure of one element of the thyristor rectifier. The method can be realized.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

1 ... AC power supply, 2 ... Phase control unit, 2A ... Reference phase detector, 2B ... Gate pulse generator, 3 ... Field breaker, 4 ... Fuse with alarm contact, 4U ... Fuse with alarm contact (for U phase) 4, 4V ... Fuse with alarm contact (for V phase), 4W ... Fuse with alarm contact (for W phase), 5 ... Thyristor rectifier, 6 ... Load, 7 ... Thyristor rectifier transmuter, 7U ... Thyristor rectifier transmuter (for W phase) (For U phase), 7V ... Thyristor rectifier transformer (for V phase), 7W ... Thyristor rectifier transformer (for W phase), 7D ... Thyristor rectifier transformer (for DC), 8D ... Overcurrent detector, 8U, 8V, 8W ... Outflow direction overcurrent detector, 8X, 8Y, 8Z ... Inflow direction overcurrent detector, 10U, 10X, 10V, 10Y, 10W, 10Z ... Logical product circuit, 11U, 11X, 11V, 11Y, 11W, 11Z ... Holding unit, 12 ... Difference current calculation unit, 13 ... AC current detection unit, 14 ... DC current detection unit, 15 ... Control unit, 16, 17, 20 alarm unit, 18, 19 ... Failure detection unit.

Claims (16)

A reference phase detecting means that inputs the AC side voltage of the thyristor rectifier and outputs the reference phase of the AC side voltage.
A gate pulse generating means that generates a gate pulse signal based on a predetermined thyristor control angle signal and a reference phase output from the reference phase detecting means, and
When the AC side current of the psyllista rectifier and the DC side current of the psyllista rectifier are input respectively and the difference current between the AC side current and the DC side current is out of the predetermined range, the thyristor rectifier fails. A failure detection means that detects the existence and outputs a failure signal indicating this failure,
Thyristor rectifier control unit equipped with. The failure detecting means is
An AC current detecting means that detects the AC side current of the thyristor rectifier and outputs the value of the AC side current, and
A DC current detecting means that detects the DC side current of the thyristor rectifier and outputs the value of this DC side current, and
A difference current calculation means for calculating a difference current indicating a difference between the value of the AC side current from the AC current detection means and the value of the DC side current from the DC current detection means, and a difference current calculation means for calculating the difference current.
An overcurrent detecting means that detects an overcurrent of the thyristor rectifier when the difference current from the difference current calculating means is out of a predetermined range and outputs an overcurrent detection signal indicating this detection.
The control device for a thyristor rectifier according to claim 1. A reference phase detecting means that inputs the AC side voltage of the thyristor rectifier and outputs the reference phase of the AC side voltage.
A gate pulse generating means that generates a gate pulse signal based on a predetermined thyristor control angle signal and a reference phase output from the reference phase detecting means, and
When the AC side current of the thyristor rectifier and the DC side current of the thyristor rectifier are input respectively and the difference current between the AC side current and the DC side current is out of the predetermined range, the failed element of the thyristor rectifier. And a failure detection means that outputs a failure signal indicating this failure element,
Thyristor rectifier control unit equipped with. The failure detecting means is
An AC current detecting means that detects the AC side current of the thyristor rectifier and outputs the value of the AC side current, and
A DC current detecting means that detects the DC side current of the thyristor rectifier and outputs the value of this DC side current, and
A difference current calculation means for calculating a difference current indicating a difference between the value of the AC side current from the AC current detection means and the value of the DC side current from the DC current detection means, and a difference current calculation means for calculating the difference current.
An overcurrent detecting means that detects an overcurrent of the thyristor rectifier when the difference current from the difference current calculating means is out of a predetermined range and outputs an overcurrent detection signal indicating this detection.
The outflow direction in which the AC side current is input, the overcurrent of the thyristor rectifier is detected when the current in the outflow direction in the thyristor rectifier exceeds a predetermined value, and the first overcurrent signal indicating this detection is output. Overcurrent detection means and
The inflow direction in which the AC side current is input, the overcurrent of the thyristor rectifier is detected when the current in the inflow direction in the thyristor rectifier exceeds a predetermined value, and a second overcurrent signal indicating this detection is output. Overcurrent detection means and
A logical product circuit that detects a short-circuited thyristor element by a logical product operation using the overcurrent detection signal and the first and second overcurrent signals as inputs and outputs the failure signal indicating this failure.
The control device for a thyristor rectifier according to claim 3. The alternating current detecting means is
The control device for a thyristor rectifier according to claim 2 or 4, wherein the full-wave rectified value of the AC side current is detected and this value is output as the value of the AC side current. The alternating current detecting means is
The control device for a thyristor rectifier according to claim 2 or 4, wherein an inflow current obtained by adding a positive value among the instantaneous values of the AC side current is calculated, and the value of this current is output as the value of the AC side current. The alternating current detecting means is
The thyristor according to claim 2 or 4, wherein the outflow current, which is an absolute value obtained by adding a negative value among the instantaneous values of the AC side current, is calculated and the value of this current is output as the value of the AC side current. Rectifier control device. The alternating current detecting means is
The control device for a thyristor rectifier according to claim 2 or 4, wherein the absolute value of the AC side current of each phase is added and multiplied by 1/2 to output the value of the AC side current as the value of the AC side current. Input the AC side voltage of the thyristor rectifier and output the reference phase of the AC side voltage.
To generate a gate pulse signal based on a predetermined thyristor control angle signal and the reference phase,
When the AC side current of the psyllista rectifier and the DC side current of the psyllista rectifier are input respectively and the difference current between the AC side current and the DC side current is out of the predetermined range, the psyllista rectifier is out of order. To detect that and output a failure signal indicating this failure,
How to control a thyristor rectifier with. Outputting the failure signal
To detect the AC side current of the thyristor rectifier and output the value of this AC side current,
To detect the DC side current of the thyristor rectifier and output the value of this DC side current,
To calculate the difference current indicating the difference between the value of the AC side current and the value of the DC side current, and
This includes detecting an overcurrent of the thyristor rectifier when the difference current is out of a predetermined range and outputting an overcurrent detection signal indicating this detection.
The control method for a thyristor rectifier according to claim 9. Input the AC side voltage of the thyristor rectifier and output the reference phase of the AC side voltage.
To generate a gate pulse signal based on a predetermined thyristor control angle signal and the reference phase,
When the AC side current of the psyllista rectifier and the DC side current of the psyllista rectifier are input respectively and the difference current between the AC side current and the DC side current is out of a predetermined range, the fault element of the thyristor rectifier. Is detected and a failure signal indicating this failed element is output.
How to control a thyristor rectifier with. Outputting the failure signal
To detect the AC side current of the thyristor rectifier and output the value of this AC side current,
To detect the DC side current of the thyristor rectifier and output the value of this DC side current,
To calculate the difference current indicating the difference between the value of the AC side current and the value of the DC side current, and
When the difference current is out of the predetermined range, the overcurrent of the thyristor rectifier is detected, and an overcurrent detection signal indicating this detection is output.
When the AC side current is input and the current in the outflow direction of the thyristor rectifier exceeds a predetermined value, the overcurrent of the thyristor rectifier is detected, and the first overcurrent signal indicating this detection is output. ,
When the AC side current is input and the current in the inflow direction of the thyristor rectifier exceeds a predetermined value, the overcurrent of the thyristor rectifier is detected, and a second overcurrent signal indicating this detection is output. ,
11. The claim 11 including detecting a failed thyristor element by a logical product calculation using the overcurrent detection signal and the first and second overcurrent signals as inputs, and outputting the failure signal indicating this failure. The method for controlling a thyristor rectifier described. Outputting the failure signal
The control method for a thyristor rectifier according to claim 10 or 12, wherein a full-wave rectified value of the AC side current signal is detected and this value is output as the AC side current value. Outputting the failure signal
The control method for a thyristor rectifier according to claim 10 or 12, wherein an inflow current obtained by adding a positive value among the instantaneous values of the AC side current is calculated, and the value of this current is output as the value of the AC side current. .. Outputting the failure signal
The 10th or 12th claim including calculating an outflow current which is an absolute value of a value obtained by adding a negative value among the instantaneous values of the AC side current and outputting the value of this current as the value of the AC side current. How to control the thyristor rectifier. Outputting the failure signal
The control method for a thyristor rectifier according to claim 10 or 12, wherein each absolute value of the AC side current of each phase is added and multiplied by 1/2 to be output as the value of the AC side current.

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