KR200278296Y1 - Operation state monitor of thyristor converter - Google Patents

Abstract

The present invention relates to an apparatus for monitoring the operation state of a thyristor converter, and more particularly, in a thyristor converter that converts alternating current into a direct current using a thyristor element, the cause of the abnormal operation of the converter is an abnormality of the thyristor element itself or thyristor driving. The present invention relates to an operating state monitoring device of a thyristor converter capable of distinguishing each other by an abnormality of a gate pulse operation.

To this end, the present invention has a thyristor converter for converting an AC power source into a direct current by providing a plurality of thyristors whose operation is turned on / off by receiving a firing pulse output from a gate amplifier to a gate terminal, wherein the thyristor element is applied between both ends of the thyristor element. Thyristor element failure detection unit for detecting a level of voltage and detecting the failure of the thyristor element itself, and a firing pulse for detecting whether the firing pulse is missing by detecting the magnitude of the gate pulse voltage output from the gate amplifier to the gate terminal of the thyristor. It is characterized by comprising a missing detection unit.

Description

Operation state monitoring device of thyristor converter

The present invention relates to an apparatus for monitoring the operation state of a thyristor converter, and more particularly, in a thyristor converter that converts alternating current into a direct current using a thyristor element, the cause of the abnormal operation of the converter is an abnormality of the thyristor element itself or thyristor driving. The present invention relates to an operating state monitoring device of a thyristor converter capable of distinguishing each other by an abnormality of a gate pulse operation.

In general, a thyristor converter is a converter for converting alternating current into direct current using one or more thyristor elements, and is widely used in direct current motor driving and direct current generators. When such a thyristor converter is used in a battery charging circuit or a DC supply device of a generator excitation system, even if one device is open, the supply current may not be normal and a problem may not occur.

However, if a large current is required due to a sudden change in load, the voltage of the converter can be limited, so that a sufficient current required by the load cannot be supplied, causing a trip of the load device.

On the other hand, the thyristor element is damaged by external surge voltage, short circuit current, etc. during operation, and the control circuit is malfunctioned or damaged by external noise, voltage surge, or the like. Therefore, the causes of anomaly in the thyristor element may be various, such as a defect of the element itself or a missing pulse of a gate amplifier that calls the element. The normal operation of the thyristor element is to check the abnormal state of the element while the thyristor converter is operating because the method of checking whether the element is actually conducted when the power supply voltage is applied to the element and the firing pulse is applied to the gate is most accurate. I need a circuit.

On the other hand, in the conventional method of detecting the abnormality of the thyristor element, when two or more elements are arranged in series, resistors are provided in parallel across the elements, and whether or not the equilibrium of voltage sharing is achieved, It is to find out if there is an abnormality. However, in the conventional method, there is a problem in that it is not possible to distinguish a case where a device is not fired due to a missing gate pulse and a case where the device is not fired due to a defect of the device itself.

Therefore, the present invention has been devised to solve the above-mentioned problems, and its purpose is to provide a thyristor converter using a plurality of thyristor elements, which is caused by the malfunction of the thyristor converter and the firing pulse of the gate amplifier due to the abnormality of the thyristor element itself. It is an object of the present invention to provide an apparatus for monitoring the operation state of a thyristor converter in which failures of the thyristor converter due to omission and the like are distinguished and detected so as to easily determine the cause of the failure.

1 is a block diagram showing a schematic configuration of an apparatus for monitoring an operating state of a thyristor converter according to the present invention.

2 is a detailed circuit diagram illustrating a circuit configuration of an apparatus for monitoring an operating state of a thyristor converter according to the present invention.

Figure 3 (a) is an operating waveform diagram of each part in the normal operation of the thyristor element according to the present invention, Figure 3 (b) is an operation waveform diagram of each part in the abnormal operation of the thyristor element.

4 is an operation waveform diagram of each part when the thyristor gate pulse abnormality according to the present invention.

Explanation of symbols on the main parts of the drawings

10 ... Thyristor 20 ... Gate Amplifier

30 ... first voltage detector 40 ... first filter

50 thyristor element operation indicator 60 ... second voltage detector

70 ... 2nd filter part 80 ... Missing firing pulse display part

In order to achieve the above object, the operation state monitoring apparatus of the thyristor converter according to the present invention converts AC power into DC by providing a plurality of thyristors whose operation is turned on / off by receiving a firing pulse output from a gate amplifier to a gate terminal. A thyristor converter comprising: a thyristor element failure detection unit for detecting a level of a voltage applied between both ends of the thyristor element to detect a failure of the thyristor element itself, and a gate pulse voltage output from the gate amplifier to the gate terminal of the thyristor. It is characterized in that it comprises a firing pulse missing detection unit for detecting the magnitude of the missing pulse by detecting the magnitude.

In addition, the thyristor element failure detection unit of the present invention detects the voltage between the anode and the cathode of the thyristor first voltage detection unit for determining whether the momentary zero voltage for determining the normal operation of the device, and the first voltage A first filter unit for filtering out low frequency components of a signal output from the detector to remove unnecessary voltage pulses, a light emitting diode (LED1) (LED2) provided to display whether the thyristor element is conductive or non-conductive, and the first filter According to the negative output signal, the light emitting diodes (LED1) (LED2) is characterized in that it consists of a thyristor element operation display unit for controlling the on and off.

In addition, the firing pulse missing detection unit of the present invention, the second voltage detector for detecting the voltage level of the pulse signal output from the gate amplifier, and the second filter for filtering and outputting low-frequency components of the signal output from the second voltage detector A light emitting diode (LED3) (LED4) provided to indicate whether the gate amplifier is missing a firing pulse and the output signal of the second filter unit to control the dot / off of the light emitting diode (LED3) (LED4) It is characterized by consisting of a missing firing pulse display unit for indicating whether or not the normal operation of the gate amplifier.

Hereinafter, the configuration and operation effects of the apparatus for monitoring the operating state of the thyristor converter according to the preferred embodiment of the present invention will be described with reference to the accompanying drawings.

1 is a block diagram of an apparatus for monitoring an operating state of a thyristor converter according to the present invention. As shown in FIG. 1, an apparatus for monitoring an operating state of a thyristor converter according to the present invention includes a portion for detecting an abnormal operation of the thyristor element 10 and a gate amplifier 20 for supplying a gate pulse to the thyristor 10. ) May be divided into parts for detecting an abnormal operation due to a missing pulse.

That is, in the part for detecting the thyristor element in the present invention, when the normal thyristor element is conducted, a very low voltage is applied between both ends of the element, and when the thyristor element is not connected, a voltage is applied by the supply voltage and the other thyristor element. If the voltage across the device is not detected, the device determines the normal operation due to the device conduction. In addition, in the portion of detecting a missing pulse of the gate amplifier 20, the magnitude of the pulse voltage output from the gate amplifier 20 is detected to determine a malfunction of the converter depending on whether or not a firing pulse is generated.

Thus, as shown in FIG. 1, the part for detecting the thyristor element abnormality of the present invention is the thyristor 10 whose operation is turned on / off depending on whether the gate pulse from the gate amplifier 20 applying the firing pulse is input. And a first voltage detector 30 that detects a voltage across the anode and the cathode of the thyristor 10 to determine whether instantaneous zero voltage is generated to determine normal operation of the device, and the first voltage detector 30. A first filter unit 40 for filtering out low frequency components of a signal output from the signal to remove unnecessary voltage pulses, a light emitting diode (LED1) (LED2) arranged to display normal and abnormal states of the thyristor element, respectively, and the first The thyristor element operation display unit 50 controls the light-emitting diodes LED1 and LED2 to be turned off and on in accordance with the output signal of the filter unit 40.

In addition, a portion for detecting a missing pulse from the gate amplifier 20 includes a second voltage detector 60 for detecting a voltage level of a pulse signal output from the gate amplifier 20, and the second voltage detector 60. A second filter unit 70 for filtering and outputting low frequency components of the signal output from the signal, a light emitting diode (LED3) (LED4) arranged to indicate whether the firing pulse of the gate amplifier 20 is missing, and the second filter In response to the output signal of the unit 70, the light emitting diode LED3 (LED4) by controlling the on / off of the firing pulse missing display unit 80 to indicate whether or not the normal operation of the gate amplifier 20.

2 is a circuit diagram illustrating a circuit configuration of an operation state display device of a thyristor converter according to an embodiment of the present invention. As shown in FIG. 2, the first voltage detector 30 for detecting the voltage level across the thyristor element divides the voltage between the both ends of the element 10 by the resistors R1 and R2, and divides the voltage from the divided voltage. Since the voltage required to detect the failure of the device itself is a zero voltage instead of the voltage across the device, the peak value of the divided voltage level through the zener diodes ZD1 and ZD2 is removed. In addition, the isolation amplifier OP1 is used to insulate the detection signal in order to prevent intrusion into a high voltage monitoring circuit caused by a fault.

The voltage signal output from the isolation amplifier OP1 is applied to the inverting terminal of the first comparator OP2 and compared with a reference voltage set and input by the resistors R3 and R4 to the non-inverting terminal. At this time, the reference voltage set on the non-inverting terminal of the first comparator OP2 is set to about +0.1 V as an upper limit value for determining whether zero voltage is generated.

The voltage signal output from the isolation amplifier OP1 is input to the non-inverting terminal of the second comparator OP3 and compared with the reference voltage set by the resistors R5 and R6 at the inverting terminal thereof. At this time, the reference voltage set in the inverting terminal of the second comparator OP3 is set as -0.1V as a lower limit value for determining whether zero voltage is generated. Therefore, when the AND gate AND compares the first comparator OP2 and the second comparator OP3 with the voltage across the device output from the isolation amplifier OP1 to be -0.1V or more and + 0.1V or less, It receives a high level signal output from each comparator and outputs a high level signal as its output signal.

On the other hand, the first filter unit 40 is a low-frequency filter composed of a resistor (R7) and a capacitor (C1) connected in parallel with the first filter unit 40 after filtering the unnecessary voltage pulse generated as the voltage across the device instantaneously becomes a zero voltage The thyristor element operation display unit 50 is applied.

The thyristor element operation display unit 50 receives the signal filtered by the filter unit 40 from the non-inverting terminal of the third comparator OP4 and compares it with the reference voltage set in the inverting terminal. By outputting sufficient current capacity for driving LED1 (LED2), the green light emitting diode LED2 indicating normal operation of the thyristor element and the red light emitting diode LED1 indicating abnormal operation are turned on or off. .

As shown in FIG. 2, in the configuration for detecting a missing pulse from the gate amplifier 20, the second voltage detector 60 includes a diode D2 for preventing a reverse current to the gate amplifier 20, and The fourth comparator OP6 receives a signal having a zener diode ZD3 for preventing excessive current from being introduced and the excess current component is removed by the zener diode ZD3, and the fourth comparator OP6 receives the non-inverting terminal. Compared to the voltage, the second buffer OP7 outputs the current at a predetermined level.

Thereafter, the second filter unit 70 converts the pulse width of the hundreds of microseconds output from the second voltage detector 60 into a pulse signal of several milliseconds, and outputs the fifth comparator OP8 of the missing firing pulse display unit 80. ) Amplifies and outputs only a voltage signal equal to or greater than the reference voltage set in the inverting terminal with respect to the signal output from the second filter unit 70, and amplifies the signal to a current capacity required for driving the LED by the third buffer OP9. The lighting of the green light emitting diode LED4 indicating the gate pulse normal and the red light emitting diode LED3 indicating the gate pulse missing are controlled.

Hereinafter will be described the operation and effect of the operation state monitoring device of the thyristor converter according to a preferred embodiment of the present invention.

Figure 3 (a) is an operating waveform diagram of each part during the normal operation of the thyristor element according to the present invention, Figure 3 (b) is an operating waveform diagram of each part during the abnormal (open: OPEN) operation of the thyristor element. As shown in FIGS. 3A and 3B, the method for detecting a failure of the thyristor element itself may be performed by firstly dividing the resistance of the first voltage detector 30 while a power supply voltage is applied across the thyristor element. After voltage dividing by (R1) and (R2), the voltage signal of the unnecessary portion is clamped by the zener diodes ZD1 and ZD2, and then the isolated voltage signal is passed through the isolation amplifier OP1 to the first comparator OP2. Is authorized.

At this time, when the thyristor element is normally operated, the voltage waveform of VaVb of FIG. 3 (a) is applied to both ends of the isolation amplifier OP1. At this time, the voltage drop in the thyristor element is nearly 2V or less, and the frequency of the power supply voltage repeatedly appears at 60Hz. However, if the device is abnormal, it becomes a waveform like VaVb of FIG. 4, and the voltage across the device is generated at zero voltage for a very short time. That is, if the device voltage has a section close to zero for a certain period of time in the voltage waveform across the device, it can be said that the device operates normally.

Therefore, in order to detect that the voltage between the both ends of the device is near zero voltage, the first comparator OP2 and the second comparator OP3 respectively have the both ends between the set upper limit reference value (+ 0.1V) and lower limit reference value (-0.1V). Compare and judge the presence of voltage. That is, when the voltage across the device is less than + 0.1V, the first comparator OP2 outputs a + 5V signal at a high level as shown in Vc of FIG. 3, and the voltage across the device is -0.1V. In this case, as shown in Vd of FIG. 3, a + 5V signal is output as an example of a high level.

At this time, when it is determined that the device operates normally because the voltage across the device is within the range of the upper limit reference value and the lower limit reference value, both the first comparator OP2 and the second comparator OP3 output a high level (+ 5V) signal. As a result, the AND gate AND applies the high level output signal to the first filter unit 40 as shown in Ve of FIG. 3.

The first filter unit 40 filters the unnecessary voltage pulses generated when the output signal of the voltage detector 30 becomes zero voltage instantaneously, as shown by the Vd waveform of FIG. The signal is erased as described above and output to the thyristor element operation display unit 50.

The third comparator OP4 of the thyristor element operation display unit 50 outputs only an input signal larger than the reference voltage set in the inverting terminal in order to remove some unnecessary waveforms included in the voltage passing through the first filter unit 40. In addition, the first buffer OP5 has sufficient current capacity to drive the diode.

In addition, when the voltage is + 5V with respect to the output of the first buffer OP5 as shown in VfVg of FIG. 3, the light emitting diode LED1 (LED2) flows from the buffer OP5 to the ground through the green diode LED2 and is green. When the diode LED2 emits light and the first buffer output is 0V, current flows to the power supply (+ 5V), the red diode LED1, and the first buffer OP5 to light up the red diode LED1.

If the voltage across the device is near zero voltage for only a predetermined period (5.57 msec) as shown in VfVg of FIG. 3, the output of the buffer OP5 becomes + 5V, and the green light emitting diode LED2 lights up to indicate normal operation. If the voltage across the device does not maintain zero voltage as shown in Ve of FIG. 4 due to the opening of the device, the output of the buffer OP5 becomes 0V as shown in VfVg of FIG. Lights up to indicate an element failure.

At this time, the zero voltage detected from the voltage across the device appears 60 times a second, so if the device is normal, the red and green diodes (LED1) and LED2 (flashing) alternately blinks, so the red and green diodes At the same time, it appears to be lit. Therefore, when a short circuit occurs in the device, the voltage across the device is output at zero voltage for a predetermined time (5.57 msec) or more, so that the green diode LED2 does not alternately blink with the red diode LED1 and the green diode LED2 does not blink. Only the light will be on continuously.

4 is an operation waveform diagram of each part when the thyristor gate pulse abnormality according to the present invention. As shown in FIG. 4, in the second voltage detector 60 for detecting a missing pulse of the gate amplifier 20, a current is prevented from flowing into the thyristor gate in the circuit through the diode D2, and the gate terminal is blocked. As the gate signal applied to the V1V2 of FIG. 5, since the rising part is made of a very large pulse, excessive voltage is introduced into the monitoring circuit by the zener diode ZD3 to prevent the device from being damaged.

On the other hand, the fourth comparator OP6 outputs a signal as shown in V3 of FIG. 5 in comparison with the reference voltage set by the resistors R12 and R13 to distinguish the pulse voltage from other noise. At this time, the second buffer OP7 serves to increase the current capacity required by the missing firing pulse display unit 80.

The second filter unit 70 is a low-frequency filter composed of a resistor R14 and a capacitor C2, and converts a pulse width of several hundred microseconds into a pulse signal of several milliseconds as shown in V4 of FIG. Output to the fifth comparator OP8.

The fifth comparator amplifies and outputs a signal above the set reference voltage set by the resistors R15 and R16, and the third buffer OP9 increases the current capacity required for driving the diode. The output voltage of the third buffer OP9 becomes a signal in which the gate pulse width is sufficiently increased as in V5V6 of FIG. 5. At this time, when the output voltage of the buffer OP9 is + 5V, current flows to the buffer, the green diode LED4 and the ground, and the green diode LED4 is turned on. When the output voltage of the buffer OP9 is 0V, the power supply (+ 5V) The red diode (LED3) lights up when current flows through the red diode (LED3) and the buffer.

That is, when the gate pulse is not output from the gate amplifier 20 to the gate terminal of the thyristor, the output of the third buffer OP9 continues to be 0V so that only the red diode LED3 is continuously turned on. Signal like the waveform of V5V6 of 5 is outputted and the red diode (LED3) and the green diode (LED4) are turned on alternately. That is, since the emission period of the green and red diodes in the normal operation is 60 [Hz], the green and red diodes are visually shown to be turned on.

As described above, when the thyristor operates normally, the red diode LED1 and the green diode LED2 of the thyristor element operation display unit 50 are turned on, and only the red diode LED1 is turned on when the thyristor is normally operated. In the firing pulse missing display unit 80, the red diode LED3 and the green diode LED4 are continuously turned on when the gate pulse continues to come out, and only the red diode LED3 is turned on when the firing pulse is missing. Combining these conditions is as shown in Table 1 below.

Light emitting diode LED1 LED2 LED3 LED4 Judgment color Red green Red green Diode emission state ON ON ON ON Normal operation state ON OFF ON ON Device failure state (open) OFF ON ON ON Device failure status (short circuit) - - ON OFF Gate pulse missing or not driving - - OFF ON Converter abnormal OFF OFF - -

The operating state monitoring apparatus of the thyristor converter according to the present invention is not limited to the above-described embodiment, and may be variously modified and implemented within the range allowed by the technical idea of the present invention.

As described above, the apparatus for monitoring the operating state of the thyristor converter according to the present invention distinguishes and detects an operation abnormality due to a defective element of the thyristor and an operation abnormality due to a missing gate pulse input from the gate amplifier to the gate terminal of the thyristor. As a result, it is possible to obtain an effect that enables quick judgment on the failure site.

In addition, by using the operation state monitoring device of the thyristor converter according to the present invention, it is possible to easily identify the faulty part when the converter malfunctions, and to prevent the abnormal operation of the related equipment due to the malfunction of the converter by enabling the quick action on the faulty part. Will provide the effect.

Claims (3)

In the thyristor converter for converting AC power into direct current by providing a plurality of thyristors to receive the firing pulse output from the gate amplifier to the gate terminal, the operation is turned on / off, A thyristor element failure detector for detecting a level of the voltage applied between both ends of the thyristor element to detect a failure of the thyristor element itself; And a firing pulse drop detection unit for detecting whether a firing pulse is missing by detecting a magnitude of a gate pulse voltage output from the gate amplifier to a gate terminal of the thyristor. The thyristor element failure detection unit according to claim 1, wherein A first voltage detector configured to detect a voltage across the anode and the cathode of the thyristor to determine whether a momentary zero voltage is generated to determine normal operation of the device; A first filter unit filtering out low frequency components of the signal output from the first voltage detector to remove unnecessary voltage pulses; A light emitting diode LED1 (LED2) provided to indicate whether the thyristor element is conductive or non-conductive; And a thyristor element operation display unit for controlling the lighting and turning off of the light emitting diodes (LED1) (LED2) according to the output signal of the first filter unit. The method of claim 1, wherein the missed pulse detection unit A second voltage detector for detecting a voltage level of the pulse signal output from the gate amplifier; A second filter unit for filtering and outputting low frequency components of the signal output from the second voltage detector; A light emitting diode (LED3) (LED4) provided to indicate whether the gate amplifier is missing a firing pulse; Monitoring of the operation state of the thyristor converter, characterized in that the control unit is turned off the light emitting diode (LED3) (LED4) in accordance with the output signal of the second filter unit to indicate whether or not the gate amplifier is operating normally. Device.