Direct-current transmission converter valve control protection system and control protection method thereof
A technology of control protection and direct current transmission, applied in the direction of direct current network circuit devices, electrical components, circuit devices, etc., can solve the problems of stable operation of the system, complex coding, passive monitoring, etc., to reduce downtime and maintenance time, intelligent The effect of high level of chemicalization and improved stability
Active Publication Date: 2015-03-25
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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Problems solved by technology
[0002] The redundant design of the traditional converter valve control and protection system is not perfect, only one system can receive the return information from the converter valve, and the switching time of the master-slave system is long, which has a great impact on the DC transmission system
In order to reduce the number of triggering optical fibers, some converter valve control and protection systems use optical splitter design on the high-voltage side, but the reliability of the optical splitter is poor, which increases the instability of the system
Moreover, the traditional DC converter valve triggering and monitoring unit has problems such as passive monitoring, complex coding, and lack of fast energy acquisition, all of which affect the stable operation of the system
Method used
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[0038] 下面结合附图对本发明的具体实施方式作进一步的详细说明。
[0039] 本发明提供的换流阀控制保护系统原理图如 figure 1 所示,换流阀控制保护系统主要由晶闸管触发监测单元(TTM)、阀基电子设备(VBE)、极控系统和连接光纤等部分组成,其中极控系统和阀基电子设备VBE都为完全独立的双冗余系统,分别定义成极控系统A和极控系统B;VBE-A和VBE-B。原理如 figure 1 所示,极控系统A和VBE-A组成一套独立的系统、极控系统B和VBE-B组成一套独立的系统,正常运行时其中一套为主系统(运行系统)、另外一套为从系统(热备用),两套系统同时接收来自换流阀的状态回报信息并进行处理,若某一套系统出现故障或检测到换流阀严重故障时可迅速切换到热备用系统,由于无需重新启动系统和诊断故障,因此可以实现无延时切换。主系统(运行系统)和从系统(热备用)分别通过光纤与晶闸管触发监测子系统连接;晶闸管触发监测子系统包括晶闸管以及与其匹配设置的晶闸管触发监测单元TTM。 figure 1 中极控系统A和VBE-A之间的信号包括:
[0040] CBON:开关开合信号;bypass:投旁通对信号;cp:触发脉冲信号;low-voltage test:低压加压测试信号;un80:低电压信号;deblock:解闭锁信号;active:主从选择信号;trip:跳闸输出信号;rfo:解锁信号,VBEok:VBE正常信号;fp:CP回复信号;profibus:总线通信信号。
[0041]VBE与TTM之间的触发和回报信号通过两根高压光纤(触发光纤和回报光纤)连接,光纤组数与晶闸管级为一一对应关系,可以准确的按照极控系统发出的触发时序触发晶闸管,同时可以准确的对故障晶闸管进行定位。VBE还包含阀避雷器动作计数器、漏水检测器和GPS时钟校时功能,阀避雷器动作计数器对阀避雷器的动作次数进行计数;漏水检测器对水冷系统是否漏水进行检测;GPS时钟记录并上报换流阀状态、阀避雷器动作情况和水冷系统的漏水情况等信息。本发明提供的阀基电子设备的功能示意图如 figure 2 shown.
[0042] 晶闸管触发监测单元(TTM)主要实现晶闸管触发与监测、晶闸管正向过电压保护和dv / dt保护、正向过电压保护动作一定时间(由检测动作次数决定,根据实际工况...
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The invention relates to the field of direct-current transmission, in particular to a direct-current transmission converter valve control protection system and a control protection method thereof. The control protection system is formed by an operation system and a hot spare system which are in redundancy. The operation system and the hot spare system comprise a pole control system and valve base electronic equipment communicated with the pole control system respectively, the operation system and the hot spare system are connected with a thyristor triggering monitoring subsystem through optical fibers, and the thyristor triggering monitoring subsystem comprises a thyristor and a thyrustor triggering monitoring unit matched with the thyristor. Protection objects of the protection method comprise a converter valve and the valve base electronic equipment. The action results of the protection method comprise alarm, request switch and request trip. The direct-current transmission converter valve control protection system greatly improves operation stability of the direct-current transmission system, greatly reduces shutdown time and overhaul time of the direct-current transmission system and enables economical benefit advantages of the direct-current transmission system to be fully played.
Description
technical field [0001] 本发明涉及直流输电领域,具体涉及一种直流输电换流阀控制保护系统及其控制保护方法。 Background technique [0002] 传统的换流阀控制保护系统的冗余设计并不完善,仅有一个系统可以接收到来自换流阀的回报信息,并且主从系统切换时间较长,对直流输电系统造成很大的冲击。有的换流阀控制保护系统为了减少触发光纤的数量在高压侧采用分光器设计,但分光器的可靠性较差,增加了系统的不稳定因素。并且传统的直流换流阀触发与监测单元存在被动监视、编码复杂、无快速取能等问题,都对系统的稳定运行造成影响。 [0003] 换流阀是直流输电系统的核心设备,其工作的稳定性和可靠性对直流输电系统正常运行起着极为重要的作用。目前直流换流阀均采用多级晶闸管串联的方式提高换流阀的耐压水平,同时采用水冷却系统对换流阀及其阻尼回路进行冷却,因此换流阀控制保护系统要能及时可靠的实现对多晶闸管串联的直流换流阀进行控制和保护。 Contents of the invention [0004] 针对现有技术的不足,本发明的目的是提供一种直流输电换流阀控制保护系统,另一目的是提供一种直流输电换流阀控制保护方法,本发明通过极控系统、阀基电子设备(VBE)、晶闸管触发监测单元(TTM)、晶闸管阻尼回路和水冷系统的协同配合可以高效准确的完成换流阀在直流输电系统运行工况下的控制和保护功能。 [0005] 本发明的目的是采用下述技术方案实现的: [0006] 一种直流输电换流阀控制保护系统,其改进之处在于,所述控制保护系统由互为冗余的运行系统和热备用系统构成;所述运行系统和热备用系统均包括极控系统以及与其进行通信的阀基电子设备;所述运行系统和热备用系统分别通过光纤与晶闸管触发监测子系统连接; [0007] 所述晶闸管触发监测子系统包括晶闸管以及与其匹配设置的晶闸管触发监测单元。 [0008] 优选的,所述运行系统和热备用系统同时接收来自换流阀的状态回报信息并进行处理,若运行系统出现故障或检测到换流阀故障时切换到热备用系统,实现无延时切换。 [0009] 优选的,所述阀基电子设备通过一组光纤与晶闸管触发监测单元进行通信,光纤组数与单个换流阀的晶闸管级数一一对应; [0010] 所述阀基电子设备按照...
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IPC IPC(8): H02J13/00H02J1/00
Inventor 汤广福郝长城陈龙龙查鲲鹏周亮解海宁
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD