交直流混联电网自适应交流过电压保护方案的研究
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摘要
针对目前交直流混联电网交流过电压保护与直流系统控制保护策略之间缺乏有效配合的问题,以直流系统发生单极闭锁导致功率骤降为例,考虑交流滤波器的动作策略,分析了单极闭锁后交流侧无功功率、有功功率的变化特征,提出一种交直流混联系统自适应交流过电压保护新方案。该方案在直流系统单极闭锁等功率骤降情况下,综合考虑一次设备的耐压水平,在不改变原有交流保护动作特性的基础上,能够自适应调整过电压保护的时间定值,躲过交流滤波器组的切除时间,避免由于过电压保护误动带来的负荷损失;而当交流系统扰动引起过电压时,过电压保护能够按照原有的动作逻辑正确动作,保证设备安全。仿真结果表明,该方案加强了交流系统和直流系统继电保护之间的配合,对保证交直流系统稳定运行具有重要的意义。
Aiming at problem of absence of effective coordination between AC side overvoltage protection and DC control strategy and taking DC system single pole blocking leading abrupt power reduction as example, this paper analyzes filter action strategy and change rate of active and reactive power respectively after single pole blocking failure. Then a new principle of an adaptive AC overvoltage protection is put forward. With single pole blocking in DC system, considering equipment insulation level, the proposed scheme can adaptively adjust overvoltage protection time settings without changing original protection characteristics. It can slid over filter clearing time and prevent load loss caused by AC overvoltage protection action. When overvoltage is caused by AC grid disturbance, it can operate correctly according to original logic and ensure equipment safety. Simulation results show that this new scheme can strengthen protective relay coordination between AC and DC systems, and thus of great importance in improving hybrid system stability.
Aiming at problem of absence of effective coordination between AC side overvoltage protection and DC control strategy and taking DC system single pole blocking leading abrupt power reduction as example, this paper analyzes filter action strategy and change rate of active and reactive power respectively after single pole blocking failure. Then a new principle of an adaptive AC overvoltage protection is put forward. With single pole blocking in DC system, considering equipment insulation level, the proposed scheme can adaptively adjust overvoltage protection time settings without changing original protection characteristics. It can slid over filter clearing time and prevent load loss caused by AC overvoltage protection action. When overvoltage is caused by AC grid disturbance, it can operate correctly according to original logic and ensure equipment safety. Simulation results show that this new scheme can strengthen protective relay coordination between AC and DC systems, and thus of great importance in improving hybrid system stability.
引文
[1]中国南方电网超高压输电公司,华南理工大学电力学院,编.高压直流输电系统继电保护原理与技术[M].北京:中国电力出版社,2013:1-13.
[2]陈水明,余占清,谢海滨,等.互联系统电磁暂态交互作用,I:直流侧设备电磁暂态模型[J].高电压技术,2011,37(2):395-403.Chen Shuiming,Yu Zhanqing,Xie Haibin,et al.Transient interaction of HVAC and HVDC in converter station in HVDC,I:electromagnetic transient model of equipments in DC sides[J].High Voltage Engineering,2011,37(2):395-403(in Chinese).
[3]陈水明,余占清,谢海滨,等.互联系统电磁暂态交互作用,II:交流侧系统等值及稳态调试[J].高电压技术.2011,37(3):537-547.Chen Shuiming,Yu Zhanqing,Xie Haibin,et al.Transient interaction of HVAC and HVDC in converter station in HVDC,Ⅱ:equivalence circuit in AC side and steady-state debugging[J].High Voltage Engineering,2011,37(3):537-547(in Chinese).
[4]索南加乐,张健康,张军民,等.交直流混联系统对变压器保护性能的影响及解决措施[J].电力系统自动化,2010,34(3):101-105.Suonan Jiale,Zhang Jiankang,Zhang Junmin,et al.The adverse impacts on transformer protection performance by hybrid AC-DC transmission grid system and countermeasure[J].Automation of Electric Power Systems,2010,34(3):101-105(in Chinese).
[5]皮俊波,李国栋,王震,等.特高压直流功率回降故障案例仿真研究[J].电网技术,2012,36(9):68-72.Pi Junbo,Li Guodong,Wang Zhen,et al.Case study and research UHV DC system power downhill fault[J].Power System Technology,2012,36(9):68-72(in Chinese).
[6]吴萍,林伟芳,孙华东,等.多馈入直流输电系统换相失败机制及特性[J].电网技术,2012,36(5):269-274.Wu Ping,Lin Weifang,Sun Huadong,et al.Research and electromechanical transient simulation on mechanism of commutation failure in multi-infeed HVDC power transmission system[J].Power System Technology,2012,36(5):269-274(in Chinese).
[7]张纬钹,高玉明.电力系统过电压与绝缘配合[M].北京:清华大学出版社,1988:1-26.
[8]陈水明,余占清,谢海滨,等.互联系统电磁暂态交互作用研究,III:交流侧对直流侧的影响[J].高电压技术,2011,37(5):1082-1090.Chen Shuiming,Yu Zhanqing,Xie Haibin,et al.Transient interaction of HVDC and HVDC in converter station in HVDC,III:effects of AC sides on DC sides[J].High Voltage Engineering,2011,37(5):1082-1090(in Chinese).
[9]陈水明,余占清,谢海滨,等.互联系统电磁暂态交互作用研究,IV:直流侧对交流侧的影响[J].高电压技术,2011,37(7):1590-1596.Chen Shuiming,Yu Zhanqing,Xie Haibin,et al.Transient interaction of HVDC and HVDC in converter station in HVDC,III:effects of DC sides on AC sides[J].High Voltage Engineering,2011,37(7):1590-1596(in Chinese).
[10]蔡汉生,金小明,王华伟,等.云广特高压直流输电线路孤岛运行过电压及抑制[J].高电压技术,2009,35(11):2635-2638.Cai Hansheng,Jin Xiaoming,Wang Huawei,et al.Temporary overvoltage and mitigation measures for islanding operation of Yun-Guang UHVDC[J].High Voltage Engineer,2009,35(11):2635-2638(in Chinese).
[11]张健康,索南加乐,杨黎明,等.交直流混联电网过电压保护应用分析[J].电力系统自动化,2011,35(12):95-99.Zhang Jiankang,Suonan Jiale,Yang Liming,et al.Application of overvoltage protection in an AC-DC hybrid grid[J].Automation of Electric Power Systems,2011,35(12):95-99(in Chinese).
[12]赵婉君.高压直流输电工程技术[M].北京:中国电力出版社,2004:8-10.
[13]徐政.交直流电力系统动态行为分析[M].北京:机械工业出版社,2004:7-9.
[14]余兴荣,刘茂涛.云广特高压孤岛运行方式下单极闭锁性能试验分析[J].电力系统保护与控制,2014,42(7):147-149.Yu Rongxing,Liu Maotao.Monopole ESOF test of Yun-Guang UHVDC under islanded operation[J].Power System Protection and Control,2014,42(7):147-149(in Chinese).
[15]邱伟,钟杰锋,伍文城.k V云广直流换流站无功补偿与与配置方案[J].电网技术,2010,34(6):93-97.Qiu Wei,Zhong Jiefeng,Wu Wencheng.Reactive power compensation scheme and its configuration for converter station of k V DC power transmission project from Yunnan to Guangdong[J].Power System Technology,2010,34(6):93-97(in Chinese).
[16]陈水明,许伟,何金良.1 000 k V交流输电线路的工频暂态过电压研究[J].电网技术,2005,29(19):1-5.Chen Shuiming,Xu Wei,He Jinliang.Research on power frequency transient overvoltage in 1000 k V UHV AC transmission line[J].Power System Technology,2005,29(19):1-5(in Chinese).
[17]赵彤,吕明超,娄杰,等.多馈入高压直流输电系统的异常换相失败研究[J].电网技术,2015,39(3):705-711.Zhao Tong,Lu Mingchao,Lou Jie,et al.Analysis on potential anomalous commutation failure in multi-infeed HVDC transmission system[J].Power System Technology,2015,39(3):705-711(in Chinese).
[2]陈水明,余占清,谢海滨,等.互联系统电磁暂态交互作用,I:直流侧设备电磁暂态模型[J].高电压技术,2011,37(2):395-403.Chen Shuiming,Yu Zhanqing,Xie Haibin,et al.Transient interaction of HVAC and HVDC in converter station in HVDC,I:electromagnetic transient model of equipments in DC sides[J].High Voltage Engineering,2011,37(2):395-403(in Chinese).
[3]陈水明,余占清,谢海滨,等.互联系统电磁暂态交互作用,II:交流侧系统等值及稳态调试[J].高电压技术.2011,37(3):537-547.Chen Shuiming,Yu Zhanqing,Xie Haibin,et al.Transient interaction of HVAC and HVDC in converter station in HVDC,Ⅱ:equivalence circuit in AC side and steady-state debugging[J].High Voltage Engineering,2011,37(3):537-547(in Chinese).
[4]索南加乐,张健康,张军民,等.交直流混联系统对变压器保护性能的影响及解决措施[J].电力系统自动化,2010,34(3):101-105.Suonan Jiale,Zhang Jiankang,Zhang Junmin,et al.The adverse impacts on transformer protection performance by hybrid AC-DC transmission grid system and countermeasure[J].Automation of Electric Power Systems,2010,34(3):101-105(in Chinese).
[5]皮俊波,李国栋,王震,等.特高压直流功率回降故障案例仿真研究[J].电网技术,2012,36(9):68-72.Pi Junbo,Li Guodong,Wang Zhen,et al.Case study and research UHV DC system power downhill fault[J].Power System Technology,2012,36(9):68-72(in Chinese).
[6]吴萍,林伟芳,孙华东,等.多馈入直流输电系统换相失败机制及特性[J].电网技术,2012,36(5):269-274.Wu Ping,Lin Weifang,Sun Huadong,et al.Research and electromechanical transient simulation on mechanism of commutation failure in multi-infeed HVDC power transmission system[J].Power System Technology,2012,36(5):269-274(in Chinese).
[7]张纬钹,高玉明.电力系统过电压与绝缘配合[M].北京:清华大学出版社,1988:1-26.
[8]陈水明,余占清,谢海滨,等.互联系统电磁暂态交互作用研究,III:交流侧对直流侧的影响[J].高电压技术,2011,37(5):1082-1090.Chen Shuiming,Yu Zhanqing,Xie Haibin,et al.Transient interaction of HVDC and HVDC in converter station in HVDC,III:effects of AC sides on DC sides[J].High Voltage Engineering,2011,37(5):1082-1090(in Chinese).
[9]陈水明,余占清,谢海滨,等.互联系统电磁暂态交互作用研究,IV:直流侧对交流侧的影响[J].高电压技术,2011,37(7):1590-1596.Chen Shuiming,Yu Zhanqing,Xie Haibin,et al.Transient interaction of HVDC and HVDC in converter station in HVDC,III:effects of DC sides on AC sides[J].High Voltage Engineering,2011,37(7):1590-1596(in Chinese).
[10]蔡汉生,金小明,王华伟,等.云广特高压直流输电线路孤岛运行过电压及抑制[J].高电压技术,2009,35(11):2635-2638.Cai Hansheng,Jin Xiaoming,Wang Huawei,et al.Temporary overvoltage and mitigation measures for islanding operation of Yun-Guang UHVDC[J].High Voltage Engineer,2009,35(11):2635-2638(in Chinese).
[11]张健康,索南加乐,杨黎明,等.交直流混联电网过电压保护应用分析[J].电力系统自动化,2011,35(12):95-99.Zhang Jiankang,Suonan Jiale,Yang Liming,et al.Application of overvoltage protection in an AC-DC hybrid grid[J].Automation of Electric Power Systems,2011,35(12):95-99(in Chinese).
[12]赵婉君.高压直流输电工程技术[M].北京:中国电力出版社,2004:8-10.
[13]徐政.交直流电力系统动态行为分析[M].北京:机械工业出版社,2004:7-9.
[14]余兴荣,刘茂涛.云广特高压孤岛运行方式下单极闭锁性能试验分析[J].电力系统保护与控制,2014,42(7):147-149.Yu Rongxing,Liu Maotao.Monopole ESOF test of Yun-Guang UHVDC under islanded operation[J].Power System Protection and Control,2014,42(7):147-149(in Chinese).
[15]邱伟,钟杰锋,伍文城.k V云广直流换流站无功补偿与与配置方案[J].电网技术,2010,34(6):93-97.Qiu Wei,Zhong Jiefeng,Wu Wencheng.Reactive power compensation scheme and its configuration for converter station of k V DC power transmission project from Yunnan to Guangdong[J].Power System Technology,2010,34(6):93-97(in Chinese).
[16]陈水明,许伟,何金良.1 000 k V交流输电线路的工频暂态过电压研究[J].电网技术,2005,29(19):1-5.Chen Shuiming,Xu Wei,He Jinliang.Research on power frequency transient overvoltage in 1000 k V UHV AC transmission line[J].Power System Technology,2005,29(19):1-5(in Chinese).
[17]赵彤,吕明超,娄杰,等.多馈入高压直流输电系统的异常换相失败研究[J].电网技术,2015,39(3):705-711.Zhao Tong,Lu Mingchao,Lou Jie,et al.Analysis on potential anomalous commutation failure in multi-infeed HVDC transmission system[J].Power System Technology,2015,39(3):705-711(in Chinese).