阅读说明：本技术 一种高压晶闸管阀组触发系统及方法 (High-voltage thyristor valve group triggering system and method ) 是由 于彪 于治国 高洪芬 崔玉书 倪磊 武传艳 张善江 于 2020-12-15 设计创作，主要内容包括：本发明公开了一种高压晶闸管阀组触发系统及方法,包括：门极触发电路,所述门极触发电路包括：触发单元,被配置为用于在接收到触发指令后,分别产生正、负两路触发脉冲序列；正向脉冲变压器,用于对正向触发脉冲序列进行变压后传输至正向晶闸管串的门极触发电路；负向脉冲变压器,用于对负向触发脉冲序列进行变压后传输至负向晶闸管串的门极触发电路。触发板的正、负两路触发电路分离,且分别通过两串脉冲变压器将触发信号同晶闸管门极有效隔离,脉冲变压器与晶闸管就近安装,规避了主电路对触发板的干扰,利于阀组可靠安全运行。(The invention discloses a high-voltage thyristor valve group triggering system and a method, which comprises the following steps: a gate trigger circuit, the gate trigger circuit comprising: the trigger unit is configured to generate a positive trigger pulse sequence and a negative trigger pulse sequence respectively after receiving a trigger instruction; the forward pulse transformer is used for transforming the forward trigger pulse sequence and transmitting the transformed forward trigger pulse sequence to a gate trigger circuit of the forward thyristor string; and the negative pulse transformer is used for transforming the negative trigger pulse sequence and transmitting the transformed negative trigger pulse sequence to a gate trigger circuit of the negative thyristor string. The positive and negative trigger circuits of the trigger plate are separated, the trigger signals are effectively isolated from the gate pole of the thyristor by two series of pulse transformers respectively, and the pulse transformers and the thyristors are installed nearby, so that the interference of a main circuit on the trigger plate is avoided, and the valve group can reliably and safely operate.)

1. A high voltage thyristor valve block triggering system comprising: a gate trigger circuit, the gate trigger circuit comprising:

the trigger unit is configured to generate a positive trigger pulse sequence and a negative trigger pulse sequence respectively after receiving a trigger instruction;

the forward pulse transformer is used for transforming the forward trigger pulse sequence and transmitting the transformed forward trigger pulse sequence to a gate trigger circuit of the forward thyristor string;

and the negative pulse transformer is used for transforming the negative trigger pulse sequence and transmitting the transformed negative trigger pulse sequence to a gate trigger circuit of the negative thyristor string.

2. The high-voltage thyristor valve group triggering system as claimed in claim 1, wherein the isolation cable connected between the two paired terminals P1+ and P1 "of the triggering unit is used as the primary side of the negative pulse transformer.

3. The high-voltage thyristor valve group triggering system as claimed in claim 1, wherein the isolation cable connected between the two paired terminals P2+ and P2 "of the triggering unit is used as the primary side of the forward pulse transformer.

4. The high-voltage thyristor valve group triggering system as recited in claim 1, wherein the triggering command is transmitted to the triggering unit by an optical fiber.

5. The high voltage thyristor valve pack firing system of claim 1, further comprising a condition detection circuit, the condition detection circuit comprising:

a state detection unit configured to detect a voltage difference between voltage dividing resistors connected to both ends of the thyristor valve block; if the pressure difference is smaller than the set threshold, judging that the state of the thyristor valve group is normal; otherwise, judging that the state of the thyristor valve group is abnormal.

6. The high-voltage thyristor valve group triggering system as recited in claim 5, wherein the isolation cable and the energy-supplying magnetic ring connected between the two paired terminals P3+ and P3 "of the triggering unit form a transformer for supplying energy to the state detection unit.

7. The high-voltage thyristor valve group triggering system as recited in claim 5, wherein when the state of the thyristor valve group is abnormal, a square wave signal with a set format is sent to the control system.

8. A high-voltage thyristor valve group triggering method is characterized by comprising the following steps:

after receiving a trigger instruction, generating a positive trigger pulse sequence and a negative trigger pulse sequence respectively; respectively triggering a positive thyristor string and a negative thyristor string by using a positive trigger pulse sequence and a negative trigger pulse sequence; so as to realize consistent triggering of the high-voltage thyristor valve group.

9. The method of claim 8, further comprising: determining the voltage difference of two ends of each phase of thyristor valve group, and realizing the state judgment of the thyristor valve group based on the voltage difference; if the pressure difference is smaller than the set threshold, judging that the state of the phase thyristor valve group is normal; otherwise, judging that the state of the phase thyristor valve group is abnormal.

10. The method as claimed in claim 9, wherein if the state of the phase thyristor valve set is determined to be abnormal, a square wave signal with a set format is sent to the control system.

Technical Field

The invention relates to the technical field of high-voltage thyristor valve banks, in particular to a high-voltage thyristor valve bank triggering system and method.

Background

The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.

The high-voltage thyristor valve group is formed by connecting a plurality of stages of anti-parallel thyristor pairs in series, is a core device of SVC equipment, and ensures that the reliable triggering of the anti-parallel thyristor pairs is the premise of normal operation of the SVC equipment. Because the thyristor valve group works in a high-voltage environment, the online detection of the state of the thyristor in time is also a key point when SVC equipment runs.

In the prior art, the most adopted triggering scheme of the high-voltage thyristor valve group is that a resistor and a capacitor energy-taking loop are directly designed on a high potential, and a trigger plate is powered and receives an optical trigger signal to realize photoelectric triggering. The biggest defect of the high-potential self-energy-taking triggering is that the thyristor cannot realize zero-crossing point triggering and is only suitable for triggering the thyristor under a larger triggering angle. In addition, at present, no state detection scheme for the high-voltage thyristor valve group exists.

Disclosure of Invention

In order to solve the problems, the invention provides a high-voltage thyristor valve group triggering system and a high-voltage thyristor valve group triggering method, which can provide positive and negative triggering pulse sequences and ensure the consistent and reliable conduction of a thyristor valve. Meanwhile, the state of the thyristor can be detected on line under the condition that the thyristor is turned off.

In some embodiments, the following technical scheme is adopted:

a high voltage thyristor valve pack firing system comprising: a gate trigger circuit, the gate trigger circuit comprising:

the trigger unit is configured to generate a positive trigger pulse sequence and a negative trigger pulse sequence respectively after receiving a trigger instruction;

and the forward pulse transformer is used for transforming the forward trigger pulse sequence and transmitting the transformed forward trigger pulse sequence to the gate trigger circuit of the forward thyristor string.

And the negative pulse transformer is used for transforming the negative trigger pulse sequence and transmitting the transformed negative trigger pulse sequence to a gate trigger circuit of the negative thyristor string.

As a further scheme, an isolation cable connected between two paired connecting terminals P1+ and P1-of the trigger unit is used as the primary side of the negative pulse transformer.

As a further proposal, an isolation cable connected between two paired terminals P2+ and P2-of the trigger unit is used as the primary side of the forward pulse transformer.

As a further scheme, the triggering instruction is transmitted to the triggering unit by an optical fiber.

As a further scheme, the device also comprises a state detection circuit, wherein the state detection circuit comprises:

a state detection unit configured to detect a voltage difference between voltage dividing resistors connected to both ends of the thyristor valve block; if the pressure difference is zero, judging that the state of the thyristor valve group is normal; otherwise, judging that the state of the thyristor valve group is abnormal.

As a further scheme, an isolation cable and an energy supply magnetic ring connected between two paired connecting terminals P3+ and P3-of the trigger unit form a transformer for supplying energy to the state detection unit.

As a further scheme, when the state of the thyristor valve group is abnormal, a square wave signal with a set format is sent to a control system.

In other embodiments, the following technical solutions are adopted:

a high-voltage thyristor valve group triggering method comprises the following steps:

after receiving a trigger instruction, generating a positive trigger pulse sequence and a negative trigger pulse sequence respectively; respectively triggering a positive thyristor string and a negative thyristor string by using a positive trigger pulse sequence and a negative trigger pulse sequence; so as to realize consistent triggering of the high-voltage thyristor valve group.

As a further scheme, the method further comprises the following steps: determining the voltage difference of two ends of each phase of thyristor valve group, and realizing the state judgment of the thyristor valve group based on the voltage difference; if the pressure difference is smaller than the set threshold, judging that the state of the phase thyristor valve group is normal; otherwise, judging that the state of the phase thyristor valve group is abnormal.

As a further scheme, if the state of the phase thyristor valve group is judged to be abnormal, a square wave signal with a set format is sent to a control system.

Compared with the prior art, the invention has the beneficial effects that:

(1) the trigger signal from the control system is transmitted by optical fiber, and has very high electromagnetic compatibility. The gate signal of the thyristor is generated into a pulse sequence by the trigger plate, and the format of the pulse sequence can be set according to the requirement, so that the pulse sequence can be conveniently modified, and the accuracy and reliability of the trigger time can be ensured.

(2) The positive and negative trigger circuits of the trigger plate are separated, the trigger signals are effectively isolated from the gate pole of the thyristor by two series of pulse transformers respectively, and the pulse transformers and the thyristors are installed nearby, so that the interference of a main circuit on the trigger plate is avoided, and the valve group can reliably and safely operate.

(3) The state detection circuit of the thyristor valve group is simple in wiring, can perform online detection when the thyristor is not switched on, returns the state fault of the valve group, uploads a square wave signal when the fault occurs, and timely and effectively protects the thyristor valve.

(4) The triggering scheme of the invention can be triggered by the zero crossing point and can be triggered by any angle, and the common target application occasion is under the working condition of zero crossing point triggering.

Drawings

FIG. 1 is a general wiring diagram of a high-voltage thyristor valve group triggering system in an embodiment of the invention;

FIG. 2 is a wiring diagram of a high-voltage thyristor valve group triggering system in the embodiment of the invention;

FIG. 3 is a schematic block diagram of a high voltage thyristor valve block triggering system in an embodiment of the invention;

FIG. 4 is a circuit diagram of a state detection circuit of a high-voltage thyristor valve group in an embodiment of the invention;

fig. 5 is a schematic connection state diagram of a three-phase high-voltage thyristor valve group in the embodiment of the invention.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Example one

In one or more embodiments, a high-voltage thyristor valve group triggering system is disclosed, and with reference to fig. 1, the system specifically includes: a gate trigger circuit and a state detection circuit.

The gate trigger circuit is used for receiving a trigger instruction of the control system and generating a pulse sequence capable of reliably triggering the thyristor; the state detection circuit is used for detecting the state of the thyristor at the moment of turn-off of the thyristor and uploading the state of the thyristor to the control system through the communication optical fiber.

In this embodiment, the control system is a device that controls, protects, and monitors the entire SVC device on the weak current side.

Specifically, referring to fig. 2 and 3, the gate trigger circuit includes:

the trigger unit is configured to generate a positive trigger pulse sequence and a negative trigger pulse sequence respectively after receiving a trigger instruction;

and the forward pulse transformer is used for transforming the forward trigger pulse sequence and transmitting the transformed forward trigger pulse sequence to the gate trigger circuit of the forward thyristor string.

And the negative pulse transformer is used for transforming the negative trigger pulse sequence and transmitting the transformed negative trigger pulse sequence to a gate trigger circuit of the negative thyristor string.

The pulse transformer is of a straight-through type, an isolation cable is connected between terminals P1+ and P1-of the trigger unit, the isolation cable is used as the primary side of the negative pulse transformer, and all the negative pulse transformers are connected in series; the secondary side of the negative pulse transformer is connected with a gate trigger circuit of the negative thyristor string.

An isolation cable is connected between terminals P2+ and P2-, and the isolation cable is used as the primary side of the forward pulse transformer; connecting all the forward pulse transformers in series; the secondary side of the forward pulse transformer is connected with a gate trigger circuit of the forward thyristor string.

In this embodiment, the gate trigger circuit selects a driver board, and the driver board is installed on the secondary side of the pulse transformer.

In this embodiment, the light receiving circuits LR1 and LR2 using the triggering units respectively receive the positive and negative triggering signals sent from the controller optical fiber; the programmable device on the trigger unit can generate corresponding positive and negative pulse trigger sequences after receiving the trigger signal, generate a large-current trigger pulse through the gate trigger circuit, and directly trigger the thyristor after passing through the pulse transformer, thereby ensuring consistent and reliable triggering of the thyristor string.

In addition, the trigger unit also has the functions of monitoring the voltage of the circuit board and supplying power to the state detection circuit.

Referring to fig. 4, the state detection circuit includes: a state detection unit configured to detect a voltage difference between voltage dividing resistors connected to both ends of the thyristor valve block; if the pressure difference is smaller than the set threshold, judging that the state of the thyristor valve group is normal; otherwise, judging that the state of the thyristor valve group is abnormal.

It should be noted that the thyristor valve group of the embodiment can be applied to a single-phase working condition and can also be applied to a three-phase working condition; when applied to three-phase operating mode, the structure and the parameter of every looks thyristor valve group are often the same, for example: FIG. 5 is a schematic diagram of the connection of a three-phase thyristor valve group in a star connection method; of course, this is also true for three-phase angle connections.

In this embodiment, the energy of the state detection unit is provided by the trigger unit, and the isolation cable and the energy-transmitting magnetic ring connected between the terminals P3+ and P3 "of the trigger unit form a transformer for supplying energy to the state detection unit.

Two ends of each phase thyristor valve group are respectively connected with a 1M omega voltage-dividing resistor, and the other ends of the two voltage-dividing resistors are connected to a voltage comparison circuit of the state detection unit. The state detection unit can detect the state of the thyristor when the thyristor is turned off, when the state of the thyristor is normal, the voltage shared by two symmetrical parts of the thyristor valve group is approximately equal, and the voltage difference between the two parts is smaller than a set threshold value. When a thyristor fails, the voltages borne by the two symmetrical parts are different, so that a large differential pressure signal is detected, and a square wave signal with a fixed format is sent to a control system.

The 75k omega resistor shown in fig. 2 is the voltage-sharing resistor of the thyristor, and each anti-parallel thyristor pair is connected with a 75k omega voltage-sharing resistor in parallel, so as to ensure that the voltage born by each thyristor pair is the same.

Example two

In one or more embodiments, a high voltage thyristor valve block triggering method is disclosed, comprising:

after receiving a trigger instruction, generating a positive trigger pulse sequence and a negative trigger pulse sequence respectively; respectively triggering a positive thyristor string and a negative thyristor string by using a positive trigger pulse sequence and a negative trigger pulse sequence; so as to realize consistent and reliable triggering of the high-voltage thyristor valve group.

Determining the voltage difference of two ends of each phase of thyristor valve group, and realizing the state judgment of the thyristor valve group based on the voltage difference; if the pressure difference is smaller than the set threshold, judging that the state of the phase thyristor valve group is normal; otherwise, judging that the state of the phase thyristor valve group is abnormal.

And if the state of the phase thyristor valve group is judged to be abnormal, sending a square wave signal with a set format to the control system.

The specific implementation of the above process has been described in the first embodiment, and is not described again.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.