一起交流滤波器保护误动引起直流极闭锁的故障分析
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摘要
为解决大组交流滤波器连线差动保护动作引起直流极闭锁而导致直流传输功率降低的问题,结合一起大组滤波器连线差动保护动作情况以及交流站控制系统最后断路器逻辑,对大组交流滤波器连线差动保护动作引起直流极闭锁的原因进行分析,阐明大组交流滤波器保护装置采样通道故障是差动保护误动的原因,指出交流站控制系统点位配置错误是引起直流极闭锁的原因,为此,提出改用采集换流变进线电压和换流变进线避雷器的泄漏电流来评估换流器最后断路器已断开以及最后优化交流场最后断路器判断逻辑等优化措施,可大大改善直流输电的可靠性。
In order to solve the problem of reduction of DC transmission power caused by DC bipolar blocking due to connection differential protection of AC filters(ACF),this paper analyzes reasons by combining one case of ACF connection differential protection and the last breaker logic of AC station control system.It states the reason for differential protection malfunction is fault of sampling channel of the ACF protection device and points out the reason for DC bipolar blocking is wrong configuration of AC station control point.Therefore,it proposes optimizing suggestions to improve reliability of DC power transmission such as using converter transformer primary voltage and leakage current of inlet arrestor of the converter transformer to evaluate break state of the last breaker,optimizing judging logic of the last breaker,and so on.
In order to solve the problem of reduction of DC transmission power caused by DC bipolar blocking due to connection differential protection of AC filters(ACF),this paper analyzes reasons by combining one case of ACF connection differential protection and the last breaker logic of AC station control system.It states the reason for differential protection malfunction is fault of sampling channel of the ACF protection device and points out the reason for DC bipolar blocking is wrong configuration of AC station control point.Therefore,it proposes optimizing suggestions to improve reliability of DC power transmission such as using converter transformer primary voltage and leakage current of inlet arrestor of the converter transformer to evaluate break state of the last breaker,optimizing judging logic of the last breaker,and so on.
引文
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[8]邓洁清,项巍.武南变最后断路器保护装置内部逻辑分析及优化[J].电力自动化设备,2008,28(7):121–123.DENG Jieqing,XIANG Wei.Analysis and Optimization of Interior Logic for Final Breaker Protection[J].Electric Power Automation Equipment,2008,28(7):121-123.
[2]XJ-SIEMENS.Differential Protection Relay 7UT612 Manual V4.0,EB4.300.09-07.XS-0[R].Erlangen:SIEMENS,2006.
[3]田庆.直流滤波器差动保护误动作分析[J].广东电力,2012,25(5):61–64.TIAN Qing.Analysis on Differential Protection Malfunction of DC Filter[J].Guangdong Electric Power,2012,25(5):61-64.
[4]XJ-SIEMENS.SIPROTEC Bay Control Unit 6MD663/6MD664Manual V4.1,EB4.300.06-02.XS-0[R].Erlangen:SIEMENS,2006.
[5]XJ-SIEMENS.AC Station Control(500 kV)System Information Manual,EB2.371.1.XS-0[R].Erlangen:SIEMENS,2006.
[6]张婷,蒲永红.高压直流输电系统两种最后断路器跳闸保护比较[J].上海工程技术大学学报,2011,25(2):151–153.ZHANG Ting,PU Yonghong.Comparison Between Two Kinds of Last Breaker Trip Protection in HVDC System[J].Journal of Shanghai University of Engineering Science,2011,25(2):151-153.
[7]于海,曾丽丽,杨亚璞,等.基于图论的特高压直流工程最后断路器自适应判断策略[J].电力系统自动化,2016,40(5):121–125.YU Hai,ZENG Lili,YANG Yapu,et al.Self-adaptive Strategy for the Last Breaker in UHVDC Project Based on Graph Theory[J].Automation of Electric Power Systems,2016,40(5):121-125.
[8]邓洁清,项巍.武南变最后断路器保护装置内部逻辑分析及优化[J].电力自动化设备,2008,28(7):121–123.DENG Jieqing,XIANG Wei.Analysis and Optimization of Interior Logic for Final Breaker Protection[J].Electric Power Automation Equipment,2008,28(7):121-123.