阅读说明：本技术 一种直流输电换流阀晶闸管触发监视系统及其控制方法 (Direct-current transmission converter valve thyristor trigger monitoring system and control method thereof ) 是由 胡四全 冉贤贤 马俊杰 董朝阳 肖彬 樊宏伟 吕学平 柴卫强 王蓉东 王佳佳 王 于 2021-08-12 设计创作，主要内容包括：本发明公开了一种直流输电换流阀晶闸管触发监视系统及其控制方法,换流阀分别连接主用阀控装置和备用阀控装置,晶闸管触发监视系统包括：第一光分配器设置于晶闸管的触发信号通道,其信号输入端分别与主用阀控装置和备用阀控装置通过光纤连接,其信号输出端分别与晶闸管通过光纤连接；第二光分配器设置于晶闸管的回检信号通道,其信号输入端分别与若干个晶闸管通过光纤连接,其信号输出端分别与主用阀控装置和备用阀控装置通过光纤连接；换流阀分别通过第一光分配器和第二光分配器与主用阀控装置和备用阀控装置进行数据交互。通过采用光分配器和主备用阀控装置,有效减少光纤用量,实现回检光纤和冗余阀控装置独立运行,提高可靠性和可用率。(The invention discloses a thyristor trigger monitoring system of a direct current transmission converter valve and a control method thereof, wherein the converter valve is respectively connected with a main valve control device and a standby valve control device, and the thyristor trigger monitoring system comprises: the first optical distributor is arranged in a trigger signal channel of the thyristor, the signal input end of the first optical distributor is respectively connected with the main valve control device and the standby valve control device through optical fibers, and the signal output end of the first optical distributor is respectively connected with the thyristor through the optical fibers; the second optical distributor is arranged in a return detection signal channel of the thyristor, the signal input ends of the second optical distributor are respectively connected with the thyristors through optical fibers, and the signal output ends of the second optical distributor are respectively connected with the main valve control device and the standby valve control device through the optical fibers; and the converter valve performs data interaction with the main valve control device and the standby valve control device through the first optical distributor and the second optical distributor respectively. By adopting the optical distributor and the main/standby valve control device, the use amount of the optical fiber is effectively reduced, the independent operation of the return detection optical fiber and the redundant valve control device is realized, and the reliability and the availability ratio are improved.)

1. The thyristor triggering and monitoring system of the direct-current transmission converter valve is characterized in that the converter valve is respectively connected with a main valve control device and a standby valve control device, and the thyristor triggering and monitoring system comprises: a first light distributor and a second light distributor;

the first optical distributor is arranged in a trigger signal channel of the thyristor, the signal input end of the first optical distributor is respectively connected with the main valve control device and the standby valve control device through optical fibers, and the signal output end of the first optical distributor is respectively connected with the thyristor through the optical fibers;

the second optical distributor is arranged in a return inspection signal channel of the thyristors, the signal input ends of the second optical distributor are respectively connected with the thyristors through the optical fibers, and the signal output ends of the second optical distributor are respectively connected with the main valve control device and the standby valve control device through the optical fibers;

and the converter valve performs data interaction with the main valve control device and the standby valve control device through the first optical distributor and the second optical distributor respectively.

2. The direct current transmission converter valve thyristor trigger monitoring system of claim 1,

the number of input ports of the first optical distributor is greater than or equal to the sum of the number of the main valve control devices and the number of the standby valve control devices, and the number of output ports of the first optical distributor is greater than or equal to the number of the thyristors.

3. The direct current transmission converter valve thyristor trigger monitoring system of claim 1,

the number of input ports of the second optical distributor is greater than or equal to the number of the thyristors, and the number of output ports of the second optical distributor is greater than or equal to the sum of the number of the main valve control devices and the number of the standby valve control devices.

4. The direct current transmission converter valve thyristor trigger monitoring system of claim 1,

the data frame of the trigger signal comprises: frame head, frame length, thyristor address, thyristor turn-on state, control instruction, query instruction, standby word, check word and/or frame tail; and/or

The data frame of the return detection signal comprises a frame head, a frame length, a thyristor address, a thyristor state, a standby word, a check word and/or a frame tail.

5. The direct current transmission converter valve thyristor trigger monitoring system of claim 4,

the trigger signal includes: a direct trigger instruction and a backup trigger instruction.

6. The direct current transmission converter valve thyristor trigger monitoring system of claim 4,

the return detection signal adopts a multiplexing coding mode of time coding.

7. The direct current transmission converter valve thyristor trigger monitoring system of claim 1,

and the main valve control device or the standby valve control device sequentially sends the control instruction and/or the query instruction of each thyristor according to the number of the thyristors in the converter valve.

8. The thyristor trigger monitoring system for a dc power transmission converter valve according to any one of claims 1 to 7, further comprising: a first spare optical fiber and/or a second spare optical fiber;

the first standby optical fiber is respectively connected with the main valve control device and the first optical distributor;

and the second standby optical fiber is respectively connected with the standby valve control device and the second optical distributor.

9. A control method of a direct current transmission converter valve thyristor triggering monitoring system is characterized by comprising the following steps:

sending a long pulse signal to the thyristor by the main valve control device or the standby valve control device, wherein the length of the long pulse signal is greater than the communication period of the trigger signal;

controlling a trigger control unit of the thyristor to filter the long pulse signal;

and conducting the thyristor through the trigger control unit according to the filtered long pulse signal.

10. The method for controlling the thyristor trigger monitoring system of the direct-current transmission converter valve according to claim 9, wherein after the thyristor is turned on by the trigger control unit, the method further comprises the following steps:

detecting the thyristor in real time;

and when the thyristor bears forward voltage, starting a backup trigger instruction, and sending a thyristor gate pulse signal to conduct the thyristor.

Technical Field

The invention relates to the technical field of direct-current power transmission control, in particular to a thyristor trigger monitoring system of a direct-current power transmission converter valve and a control method thereof.

Background

The extra-high voltage direct current transmission project has the advantages of large transmission capacity, long distance, low loss and the like, and plays an important role in solving regional energy imbalance and building a strong smart grid. The converter valve used as the core equipment of the direct current engineering adopts thyristors as basic components, the valve control of the converter valve directly adopts optical fibers for communication, and each thyristor needs to trigger and return to detect two optical fibers (namely an uplink communication optical fiber and a downlink communication optical fiber). A set of 12-pulse converter valves often consists of thousands of thyristors, and therefore thousands of optical fibers need to be laid. And because the optical fiber cannot be bent and cut at will, the length of each optical fiber is different and needs to be customized independently. Therefore, reducing the fiber usage of the converter valve is always a difficult problem in designing and manufacturing the converter valve.

Meanwhile, each thyristor only has one return-checking optical fiber, and the optical fibers cannot be accessed into a plurality of monitoring nodes as electrical signals, so that the monitoring equipment of the thyristor cannot be truly redundant by the valve control equipment of the converter valve. When the part has problems, the direct current needs to be stopped for processing, so that the reliability and the availability of equipment are reduced, and great economic loss is caused.

Disclosure of Invention

The invention aims to provide a direct-current transmission converter valve thyristor trigger monitoring system and a control method thereof.

In order to solve the above technical problem, a first aspect of an embodiment of the present invention provides a thyristor trigger monitoring system for a dc transmission converter valve, where the converter valve is connected to a main valve control device and a standby valve control device, respectively, and the thyristor trigger monitoring system includes: a first light distributor and a second light distributor;

the first optical distributor is arranged in a trigger signal channel of the thyristor, the signal input end of the first optical distributor is respectively connected with the main valve control device and the standby valve control device through optical fibers, and the signal output end of the first optical distributor is respectively connected with the thyristor through the optical fibers;

the second optical distributor is arranged in a return inspection signal channel of the thyristors, the signal input ends of the second optical distributor are respectively connected with the thyristors through the optical fibers, and the signal output ends of the second optical distributor are respectively connected with the main valve control device and the standby valve control device through the optical fibers;

and the converter valve performs data interaction with the main valve control device and the standby valve control device through the first optical distributor and the second optical distributor respectively.

Furthermore, the number of input ports of the first optical splitter is greater than or equal to the sum of the number of the master valve control devices and the number of the standby valve control devices, and the number of output ports of the first optical splitter is greater than or equal to the number of the thyristors.

Furthermore, the number of input ports of the second optical splitter is greater than or equal to the number of the thyristors, and the number of output ports of the second optical splitter is greater than or equal to the sum of the number of the master valve control devices and the number of the standby valve control devices.

Further, the data frame of the trigger signal includes: frame head, frame length, thyristor address, thyristor turn-on state, control instruction, query instruction, standby word, check word and/or frame tail; and/or

The data frame of the return detection signal comprises a frame head, a frame length, a thyristor address, a thyristor state, a standby word, a check word and/or a frame tail.

Further, the trigger signal includes: a direct trigger instruction and a backup trigger instruction.

Furthermore, the return detection signal adopts a multiplexing coding mode of time coding.

Further, the main valve control device or the standby valve control device sequentially sends the control instruction and/or the query instruction of each thyristor according to the number of the thyristors in the converter valve.

Further, the system for monitoring the triggering of the thyristor of the direct-current transmission converter valve further comprises: a first spare optical fiber and/or a second spare optical fiber;

the first standby optical fiber is respectively connected with the main valve control device and the first optical distributor;

and the second standby optical fiber is respectively connected with the standby valve control device and the second optical distributor.

Correspondingly, a second aspect of the embodiments of the present invention provides a method for controlling a thyristor trigger monitoring system of a dc power transmission converter valve, including the following steps:

sending a long pulse signal to the thyristor by the main valve control device or the standby valve control device, wherein the length of the long pulse signal is greater than the communication period of the trigger signal;

controlling a trigger control unit of the thyristor to filter the long pulse signal;

and conducting the thyristor through the trigger control unit according to the filtered long pulse signal.

Further, after the thyristor is turned on by the trigger control unit, the method further includes the following steps:

detecting the thyristor in real time;

and when the thyristor bears forward voltage, starting a backup trigger instruction, and sending a thyristor gate pulse signal to conduct the thyristor.

The technical scheme of the embodiment of the invention has the following beneficial technical effects:

by adopting the optical distributor and the main and standby valve control devices, the using amount of the optical fibers of the converter valve is effectively reduced, the return detection optical fibers and the redundant valve control devices can completely and independently operate, the equipment cost is reduced, and the reliability and the availability of the converter valve are improved.

Drawings

Fig. 1 is a schematic structural diagram of a thyristor triggering monitoring system of a direct-current transmission converter valve according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a pulse multiplexing communication method for a trigger signal and a return detection signal according to an embodiment of the present invention;

FIG. 3 is a diagram illustrating a frame encoding method of a trigger signal according to an embodiment of the present invention;

FIG. 4 is a schematic diagram illustrating a frame encoding method of a review signal according to an embodiment of the present invention;

fig. 5 is a flowchart of a method for controlling a thyristor trigger monitoring system of a dc power transmission converter valve according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

Fig. 1 is a schematic structural diagram of a thyristor triggering monitoring system of a direct-current transmission converter valve according to an embodiment of the present invention.

Referring to fig. 1, a first aspect of an embodiment of the present invention provides a thyristor trigger monitoring system for a dc transmission converter valve, where the converter valve is connected to a main valve control device and a standby valve control device, respectively, and the thyristor trigger monitoring system includes: a first light distributor and a second light distributor; the first optical distributor is arranged in a trigger signal channel of the thyristor, the signal input end of the first optical distributor is respectively connected with the main valve control device and the standby valve control device through optical fibers, and the signal output end of the first optical distributor is respectively connected with the thyristor through the optical fibers; the second optical distributor is arranged in a return detection signal channel of the thyristor, the signal input ends of the second optical distributor are respectively connected with the thyristors through optical fibers, and the signal output ends of the second optical distributor are respectively connected with the main valve control device and the standby valve control device through the optical fibers; and the converter valve performs data interaction with the main valve control device and the standby valve control device through the first optical distributor and the second optical distributor respectively.

The valve control equipment consists of two parts, namely a main valve control device and a standby valve control device which are mutually redundant, the two sets of devices are completely consistent and mutually independent, and each set of valve control device can flexibly configure the number of the triggering monitoring thyristor assemblies according to engineering requirements. The valve control device is connected with the converter valve by adopting optical fibers, two optical fibers (without spare optical fibers) are laid between each set of valve control system and each converter valve assembly, one optical fiber is a trigger optical fiber for transmitting thyristor control commands from the valve control to the valve assembly, and the other optical fiber is a return inspection optical fiber for transmitting thyristor state signals from the valve assembly to the valve control.

The direct-current transmission converter valve thyristor triggering monitoring system effectively reduces the using amount of the converter valve optical fiber by adopting the optical distributor and the main and standby valve control devices, can realize the complete independent operation of the reinspection optical fiber and the redundant valve control device, reduces the equipment cost, and improves the reliability and the availability of the converter valve.

Specifically, the number of input ports of the first optical splitter is greater than or equal to the sum of the number of the main valve control devices and the number of the standby valve control devices, and the number of output ports of the first optical splitter is greater than or equal to the number of the thyristors.

The trigger signal channel adopts a first optical distributor of M × N, and the optical distributor is installed in the converter valve component. Two sets of valve control equipment which are mutually redundant are respectively provided with a triggering optical fiber access optical distributor. The trigger signal is evenly divided into N paths after passing through the optical distributor, and is accessed to each thyristor trigger monitoring unit in the corresponding valve component, so that the triggering consistency is ensured.

Specifically, the number of input ports of the second optical splitter is greater than or equal to the number of the thyristors, and the number of output ports of the second optical splitter is greater than or equal to the sum of the number of the primary valve control devices and the number of the standby valve control devices.

The return inspection signal channel adopts a second optical distributor of N M, the optical distributor is arranged in the converter valve assembly, the return inspection signal adopts a multiplexing coded optical fiber bus technology, and a plurality of thyristors in each valve assembly are coded according to different rules through the same bundle of optical fibers.

And decoding the thyristor after receiving the control and query commands, if the decoded address information is consistent with the address information of the thyristor, sending the state information of the thyristor, and if the decoded address information is inconsistent with the address information of the thyristor, continuing to wait.

Fig. 2 is a schematic diagram of a pulse multiplexing communication method for the trigger signal and the echo signal according to an embodiment of the present invention.

Fig. 3 is a schematic diagram of a frame encoding method of a trigger signal according to an embodiment of the present invention.

Fig. 4 is a schematic diagram of a frame encoding method of a return detection signal according to an embodiment of the present invention.

Further, referring to fig. 2, fig. 3 and fig. 4, the data frame of the trigger signal includes: frame head, frame length, thyristor address, thyristor turn-on state, control instruction, query instruction, standby word, check word and/or frame tail. The trigger signal controlled by valve to thyristor adopts coding mode, and the data frame includes frame head, frame length, thyristor address, thyristor on-state, control instruction, inquiry instruction, standby word, check word and frame tail, etc. The thyristor control unit receives the coding signal and then performs wiring, wherein the 'inquiry instruction' responds according to the thyristor address, the 'thyristor turn-on state' is not controlled by the thyristor address, and all thyristors respond as long as one communication period is effective.

And/or the presence of a gas in the gas,

the return detection signal adopts a multiplexing coding mode of adopting time coding, and a data frame of the return detection signal comprises a frame head, a frame length, a thyristor address, a thyristor state, a standby word, a check word and/or a frame tail.

Further, the trigger signal includes: a direct trigger instruction and a backup trigger instruction.

Further, the main valve control device or the standby valve control device sequentially sends the control instruction and/or the query instruction of each thyristor according to the number of the thyristors in the converter valve.

Further, the direct current transmission converter valve thyristor triggering monitoring system further comprises: a first spare optical fiber and/or a second spare optical fiber; the first standby optical fiber is respectively connected with the main valve control device and the first optical distributor; and the second standby optical fiber is respectively connected with the standby valve control device and the second optical distributor.

Fig. 5 is a flowchart of a method for controlling a thyristor trigger monitoring system of a dc power transmission converter valve according to an embodiment of the present invention.

Correspondingly, referring to fig. 5, a second aspect of the embodiments of the present invention provides a method for controlling a thyristor trigger monitoring system of a dc power transmission converter valve, including the following steps:

and S100, sending a long pulse signal to the thyristor through the main valve control device or the standby valve control device, wherein the length of the long pulse signal is greater than the communication period of the trigger signal.

And S200, controlling a trigger control unit of the thyristor to filter the long pulse signal.

And S300, conducting the thyristor through the trigger control unit according to the filtered long pulse signal.

Further, after the thyristor is turned on by the trigger control unit, the method also comprises the following steps:

and S310, detecting the thyristor in real time.

And S320, when the thyristor bears forward voltage, starting a backup trigger instruction, and sending a thyristor gate pulse signal to turn on the thyristor.

In order to ensure the trigger consistency of the thyristor, the trigger signal of the thyristor adopts two trigger modes of direct trigger and backup trigger. When the valve control equipment needs to trigger the thyristor, a long pulse signal with the length of 10us is sent firstly (the pulse length is larger than the communication period of the trigger signal for controlling the thyristor), and after receiving the long pulse signal and filtering, the trigger control unit of the thyristor directly generates a thyristor gate pulse to conduct the thyristor. After the valve control device sends the long pulse, the 'on state' instruction in the trigger code signal sent to the thyristor by the valve control equipment is continuously effective until the whole thyristor conduction period is finished. During the period, if the thyristor control unit monitors that the thyristor bears forward voltage, backup trigger is started, and gate pulse of the thyristor is sent to conduct the thyristor.

The embodiment of the invention aims to protect a thyristor triggering and monitoring system of a direct-current transmission converter valve, wherein the converter valve is respectively connected with a main valve control device and a standby valve control device, and the thyristor triggering and monitoring system comprises: a first light distributor and a second light distributor; the first optical distributor is arranged in a trigger signal channel of the thyristor, the signal input end of the first optical distributor is respectively connected with the main valve control device and the standby valve control device through optical fibers, and the signal output end of the first optical distributor is respectively connected with the thyristor through the optical fibers; the second optical distributor is arranged in a return detection signal channel of the thyristor, the signal input ends of the second optical distributor are respectively connected with the thyristors through optical fibers, and the signal output ends of the second optical distributor are respectively connected with the main valve control device and the standby valve control device through the optical fibers; and the converter valve performs data interaction with the main valve control device and the standby valve control device through the first optical distributor and the second optical distributor respectively. The technical scheme has the following effects:

by adopting the optical distributor and the main and standby valve control devices, the using amount of the optical fibers of the converter valve is effectively reduced, the return detection optical fibers and the redundant valve control devices can completely and independently operate, the equipment cost is reduced, and the reliability and the availability of the converter valve are improved.

It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.