CN105471232B - The control method that converter valve electricity triggering IGCT is exchanged with valve base electronic device information - Google Patents

Abstract

The invention provides a control method for exchanging information between the electric trigger thyristor of a converter valve and the valve base electronic equipment, which comprises the following steps: step 1, judging the operation status of the electric trigger thyristor; step 2, when the electric trigger thyristor is in non-commutation operation stage, the TE board monitors the voltage between the anode and the cathode of the electric trigger thyristor, and performs corresponding operations according to the voltage value between the anode and the cathode of the electric trigger thyristor; step 3, when the electric trigger thyristor is in the commutation operation stage , if the valve-based electronic equipment receives the extreme control pulse from the extreme control system, the valve-based electronic equipment sends a valve control pulse with a pulse width of 3 μs to the TE board, and the TE board monitors the voltage between the anode and the cathode of the electric trigger thyristor. and perform corresponding operations according to the voltage value between the anode and the cathode of the electric trigger thyristor. The coordination control performance of the invention is very good, and it can be used as a converter valve for direct current transmission systems at various voltage levels.

Description

Control method for information exchange between converter valve electric trigger thyristor and valve base electronic equipment

technical field

The present invention relates to the technical field of electric-triggered thyristors for converter valves in electric power systems, and in particular to a method for exchanging information with valve-based electronic equipment in the two stages of commutation operation and non-commutation operation for a high-voltage direct current transmission system. Control Method.

Background technique

There are two types of thyristors for converter valves in HVDC transmission systems: electrical triggering and optical triggering, among which electrical triggering thyristors are widely used in converter valves in DC power transmission projects. In the actual operation of the converter valve, the electric trigger thyristor is mainly divided into two cases: non-commutation operation and commutation operation. Among them, the commutation operation is divided into four stages: trigger preparation, blocking, reverse recovery period and state detection. The information exchange between the VBE (valve base electronics) device and the electric trigger thyristor usually adopts the five-pulse working method to distinguish the relevant information of the four stages of commutation operation. If the VBE device communicates with the TE board in this way of information exchange, it will easily cause the light emitting board in the VBE device to heat up severely and block the DC. In addition, it will also cause the electric trigger thyristor to be unable to distinguish whether the thyristor is under positive voltage or negative voltage during the non-commutation operation stage. And overvoltage and other stages, especially when the TE board abnormally turns on the thyristor in a high-pollution and high-humidity environment, the VBE device cannot recognize the overvoltage protection action information fed back by the TE board, which brings difficulties to the fault diagnosis of the converter valve. , it is necessary to establish a control method for exchanging information between the electric trigger thyristor of the converter valve and the electronic equipment of the valve base.

Contents of the invention

In view of the above deficiencies, the object of the present invention is to provide a control method for information exchange between the electric trigger thyristor of the HVDC converter valve and the valve base electronic equipment, and design a thyristor electronic board (TE Board), to achieve seamless information exchange between the electric trigger thyristor and the valve base electronic equipment, send a trigger pulse, turn on the thyristor, and at the same time, the width of the feedback pulse through the TE board is different, and distinguish the electric trigger thyristor under positive pressure, negative pressure, overvoltage and Various stages such as high voltage change rate.

For realizing above object, the technical scheme that the present invention has taken is:

A control method for exchanging information between the electric trigger thyristor and the valve base electronic equipment of a converter valve. The electric trigger thyristor and the valve base electronic equipment are connected through a TE board. The control method includes the following steps:

Step 1. Judging the operation status of the electric trigger thyristor, if the electric trigger thyristor is in the non-commutation operation stage, then perform step 2, and if the electric trigger thyristor is in the phase commutation operation stage, then perform step 3;

Step 2. When the electric trigger thyristor is in the non-commutation operation stage, the TE board monitors the voltage between the anode and the cathode of the electric trigger thyristor, and performs one of the following situations according to the voltage value between the anode and the cathode of the electric trigger thyristor The operation:

If the voltage between the anode and the cathode of the electric trigger thyristor is greater than 80V and less than 7500V, the TE board will feed back a first pulse with a pulse width of 8μs to the valve-based electronic equipment;

If the voltage between the anode and the cathode of the electric trigger thyristor is less than -150V, the TE board feeds back a second pulse with a pulse width of 3 μs to the valve-based electronic equipment;

If the voltage between the anode and the cathode of the electric trigger thyristor is greater than 7500V, the TE board sends a trigger pulse for conducting the electric trigger thyristor to the gate of the electric trigger thyristor, and at the same time, the TE board feeds back a pulse width to the valve base electronic equipment The third pulse is 15μs;

If the voltage change rate between the anode and the cathode of the electric trigger thyristor is greater than 70V/μs, the TE board sends a trigger pulse for turning on the electric trigger thyristor to the gate of the electric trigger thyristor, and at the same time, the TE board sends a trigger pulse to the valve base electronic equipment Feedback a fourth pulse with a pulse width of 10 μs;

Step 3. When the electric trigger thyristor is in the commutation operation stage, if the valve base electronic equipment receives the extreme control pulse from the extreme control system, the valve base electronic equipment sends a valve control pulse with a pulse width of 3 μs to the TE board, and at the same time The TE board monitors the voltage between the anode and the cathode of the electric trigger thyristor, and performs one of the following operations according to the voltage value between the anode and the cathode of the electric trigger thyristor:

If the voltage between the anode and the cathode of the electric trigger thyristor is greater than 80V and less than 7500V, the TE board sends a trigger pulse for turning on the electric trigger thyristor to the gate of the electric trigger thyristor;

If the electric trigger thyristor is not turned on, when the voltage between the anode and the cathode of the electric trigger thyristor is greater than 7500V, the TE board sends a trigger pulse for conducting the electric trigger thyristor to the gate of the electric trigger thyristor, and at the same time the TE board Feedback a fifth pulse with a pulse width of 15 μs to the valve base electronics;

If the voltage between the anode and the cathode of the electric trigger thyristor is less than -150V, the TE board will feed back a sixth pulse with a pulse width of 3μs to the valve-based electronic equipment;

If the voltage change rate between the anode and the cathode of the electric trigger thyristor is greater than 70V/μs, the TE board sends a trigger pulse for turning on the electric trigger thyristor to the gate of the electric trigger thyristor, and at the same time, the TE board sends a trigger pulse to the valve base electronic equipment A seventh pulse with a pulse width of 10 μs is fed back.

The invention relates to a control method for exchanging information between electrically triggered thyristors and valve base electronic equipment in a converter valve, and mainly proposes a control method for information exchange between electrically triggered thyristors and valve base electronic equipment. Operation status, when the electric trigger thyristor is in various stages such as positive voltage, negative voltage, overvoltage and high voltage change rate, etc., the TE board will feed back pulses with different pulse widths to the VBE device, and if the conditions are met, it will send a fixed voltage to the gate of the electric trigger thyristor. The trigger pulse of the pulse width is used to trigger the thyristor when the electricity is turned on. This control method has very good coordination and control performance, and can be used for converter valves in DC transmission systems at various voltage levels, and has great application value in converter valve engineering.

Description of drawings

Fig. 1 is a flowchart of a control method for information exchange between a converter valve electric trigger thyristor and a valve base electronic device according to the present invention.

detailed description

The content of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

Example

When the converter valve is in non-commutation operation, the TE board feeds back pulses of different widths to the VBE device according to the stages of the electric trigger thyristor in positive pressure, negative pressure, overvoltage and high voltage change rate. In the two phases of high voltage and high voltage change rate, a trigger pulse with a fixed pulse width is sent to the gate of the electric trigger thyristor, and the electric trigger thyristor is turned on; , negative pressure, overvoltage and high voltage change rate, etc., feedback pulses of different widths to the VBE device, if the electric trigger thyristor is in positive pressure (at the same time, the VBE device sends a valve control pulse to the TE board), overvoltage and high voltage In the three stages of the rate of change, a trigger pulse with a fixed pulse width is sent to the gate of the electric trigger thyristor, and the electric trigger thyristor is turned on.

Please refer to FIG. 1, a control method for information exchange between the electric trigger thyristor and the valve base electronic equipment of a converter valve. The electric trigger thyristor and the valve base electronic equipment are connected through a TE board. The control method includes the following steps:

Step 1. Judging the operation status of the electric trigger thyristor, if the electric trigger thyristor is in the non-commutation operation stage, then perform step 2, and if the electric trigger thyristor is in the commutation operation stage, then perform step 3.

Step 2. When the electric trigger thyristor is in the non-commutation operation stage, the TE board monitors the voltage between the anode and the cathode of the electric trigger thyristor, and performs one of the following situations according to the voltage value between the anode and the cathode of the electric trigger thyristor The operation:

If the voltage between the anode and the cathode of the electric trigger thyristor is greater than 80V and less than 7500V, the corresponding converter valve is in the phase of non-commutation operation, and the electric trigger thyristor is in the positive pressure stage, and the TE board feeds back a pulse width to the valve base electronic equipment. 8μs first pulse;

If the voltage between the anode and the cathode of the electric trigger thyristor is less than -150V, the corresponding converter valve is in the stage where the electric trigger thyristor is under negative pressure during the non-commutation operation, and the TE board feeds back a pulse width of 3μs to the valve base electronic equipment. second pulse;

If the voltage between the anode and the cathode of the electric trigger thyristor is greater than 7500V, and the corresponding converter valve is in the stage where the electric trigger thyristor is overvoltage during the non-commutation operation, the TE board sends a signal to the gate of the electric trigger thyristor for conduction The trigger pulse of the thyristor is electrically triggered, and at the same time, the TE board feeds back a third pulse with a pulse width of 15 μs to the valve base electronic equipment;

If the voltage change rate between the anode and cathode terminals of the electric trigger thyristor is greater than 70V/μs, and the corresponding converter valve is in the stage of high voltage change rate of the electric trigger thyristor during the non-commutation operation, the TE board will send the electric trigger thyristor gate The pole sends a trigger pulse for turning on the electric trigger thyristor, and at the same time, the TE board feeds back a fourth pulse with a pulse width of 10 μs to the valve base electronic device.

Step 3. When the electric trigger thyristor is in the commutation operation stage, the TE board monitors the voltage between the anode and the cathode of the electric trigger thyristor, and performs one of the following situations according to the voltage value between the electric trigger thyristor anode and the cathode operate:

If the valve-based electronic equipment receives the extreme control pulse from the extreme control system, the valve-based electronic equipment sends a valve control pulse with a pulse width of 3 μs to the TE board, and at the same time, the voltage between the anode and cathode of the electric trigger thyristor is greater than 80V and less than 7500V, corresponding to the stage where the electric trigger thyristor is under positive pressure during the commutation operation of the converter valve, the TE board sends a trigger pulse for turning on the electric trigger thyristor to the gate of the electric trigger thyristor;

If the electric trigger thyristor is not turned on, when the voltage between the anode and the cathode of the electric trigger thyristor is greater than 7500V, the corresponding converter valve is in the stage of the electric trigger thyristor being overvoltage during the commutation operation, and the TE board will trigger the electric trigger thyristor The gate of the gate sends a trigger pulse for turning on the electric trigger thyristor, and at the same time, the TE board feeds back a fifth pulse with a pulse width of 15 μs to the valve-based electronic device;

If the voltage between the anode and the cathode of the electric trigger thyristor is less than -150V, the corresponding converter valve is in the stage where the electric trigger thyristor is under negative pressure during the commutation operation, and the TE board feeds back a pulse width of 3μs to the valve base electronic equipment. six pulses;

If the voltage change rate between the anode and the cathode of the electric trigger thyristor is greater than 70V/μs, corresponding to the stage where the electric trigger thyristor is in the stage of high voltage change rate during commutation operation, the TE board will send the electric trigger thyristor to the gate A trigger pulse for turning on the electrically triggered thyristor is sent, and at the same time, the TE board feeds back a seventh pulse with a pulse width of 10 μs to the valve base electronic device.

The above-mentioned embodiments are only to illustrate the technical concept and characteristics of the present invention, and its purpose is to enable those of ordinary skill in the art to understand the content of the present invention and implement it accordingly, and cannot limit the protection scope of the present invention. All equivalent changes or modifications made according to the essence of the present invention shall fall within the protection scope of the present invention.

Claims (1)

1. the control method that a kind of converter valve electricity triggering IGCT is exchanged with valve base electronic device information, it is characterised in that electricity is touched Connected between rutilated quartz brake tube and valve base electronic device by a TE plates, the control method comprises the following steps：

Step 1, judgement electricity triggering IGCT running situation, if electricity triggering IGCT is performed in without the commutation operation phase Step 2, if electricity triggering IGCT is in the commutation operation phase, step 3 is performed；

Step 2, it is in without the commutation operation phase when electricity triggering IGCT, TE plates monitoring electricity triggering IGCT anode and negative electrode two ends Between voltage, and perform according to the magnitude of voltage between electricity triggering IGCT anode and negative electrode two ends the behaviour of one of scenario described below Make：

If the voltage between electricity triggering IGCT anode and negative electrode two ends is more than 80V and less than 7500V, TE plates are to valve-based electronics Equipment feeds back the first pulse that a pulse width is 8 μ s；

If the voltage between electricity triggering IGCT anode and negative electrode two ends is less than -150V, TE plates feed back to valve base electronic device The second pulse that one pulse width is 3 μ s；

If the voltage between electricity triggering IGCT anode and negative electrode two ends is more than 7500V, TE plates trigger IGCT to electricity Gate pole sends the trigger pulse that IGCT is triggered for electric conduction, while TE plates feed back a pulse width to valve base electronic device For 15 μ s the 3rd pulse；

If it is brilliant to electricity triggering that the voltage change ratio between electricity triggering IGCT anode and negative electrode two ends is more than 70V/ μ s, TE plates The gate pole of brake tube sends the trigger pulse that IGCT is triggered for electric conduction, while TE plates feed back an arteries and veins to valve base electronic device Rush the 4th pulse that width is 10 μ s；

Step 3, when electricity triggering IGCT be in the commutation operation phase, if valve base electronic device receives the pole that pole control system is sent Pulse is controlled, then valve base electronic device sends the valve control pulse that a pulse width is 3 μ s to TE plates, while the monitoring electricity triggering of TE plates Voltage between IGCT anode and negative electrode two ends, and held according to the magnitude of voltage between electricity triggering IGCT anode and negative electrode two ends The operation of one of row scenario described below：

If the voltage between electricity triggering IGCT anode and negative electrode two ends is more than 80V, and is less than 7500V, then TE plates are touched to electricity The gate pole of rutilated quartz brake tube sends the trigger pulse that IGCT is triggered for electric conduction；

If electricity triggering IGCT is not turned on, when the voltage between electricity triggering IGCT anode and negative electrode two ends is more than 7500V Afterwards, then the gate pole that TE plates trigger IGCT to electricity sends the trigger pulse that IGCT is triggered for electric conduction, while TE plates are to valve Base electronic equipment feeds back the 5th pulse that a pulse width is 15 μ s；

If the voltage between electricity triggering IGCT anode and negative electrode two ends is less than -150V, TE plates feed back to valve base electronic device The 6th pulse that one pulse width is 3 μ s；

If it is brilliant to electricity triggering that the voltage change ratio between electricity triggering IGCT anode and negative electrode two ends is more than 70V/ μ s, TE plates The gate pole of brake tube sends the trigger pulse that IGCT is triggered for electric conduction, while TE plates feed back an arteries and veins to valve base electronic device Rush the 7th pulse that width is 10 μ s.