基于减载贡献因子的低频减载动态优化方法研究
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摘要
电力系统能否在出现故障后尽量少切或者不切负荷,是评价供电可靠性的重要指标。提出了在计及负荷频率调节效率的基础上,考虑有功电压特性以及负荷重要等级的减载贡献因子计算方法,通过分析减载贡献因子对不平衡功率的影响提高不平衡功率计算精度,从而对低频减载量进行逐次动态优化,减少电力系发生故障后的负荷切除量,提高互联电网的频率调节能力。仿真分析表明,所提出的基于减载贡献因子的动态优化方法,可以同时满足减少故障后负荷切除量和频率动态优化的要求,具有良好的故障应急处理经济性和可靠性。
It's the key indicator of power supply reliability in power system making fewer load shedding or making no load shedding after a fault in the system. The paper proposes the calculation method of load shedding contribution factor considering the load frequency regulation effect, P-V characteristic and importance, and improves the calculation accuracy of unbalance power by analyzing the influence of the load shedding contribution factor on the unbalance power, gradually implementing the dynamic optimization of under-frequency load shedding, reducing the amount of load shedding after a fault in the system, and enhancing the self-recovery capacity of the system frequency. The simulation and analysis shows that a reduction in the amount of load shedding after a fault and frequency dynamic optimization can be satisfied simultaneously with the proposed strategy, it has a good economy with good reliability.
It's the key indicator of power supply reliability in power system making fewer load shedding or making no load shedding after a fault in the system. The paper proposes the calculation method of load shedding contribution factor considering the load frequency regulation effect, P-V characteristic and importance, and improves the calculation accuracy of unbalance power by analyzing the influence of the load shedding contribution factor on the unbalance power, gradually implementing the dynamic optimization of under-frequency load shedding, reducing the amount of load shedding after a fault in the system, and enhancing the self-recovery capacity of the system frequency. The simulation and analysis shows that a reduction in the amount of load shedding after a fault and frequency dynamic optimization can be satisfied simultaneously with the proposed strategy, it has a good economy with good reliability.
引文
[1]中华人民共和国国务院.电力安全事故应急处置和调查处理条例[EB/OL]. Http://www.gov.cn/zwgk/2011-07/15/content_1906887.htm,[2011-07-15].
[2]陈桥平,蔡泽祥,李爱民,等.互联电网的地区频率特性差异性及其对低频减载的影响研究[J].中国电力,2009,42(8):1-5.CHEN Qiaoping, CAI Zexiang, LI Aimin, et al. Study on difference of regional frequency characteristics of interconnected power system and its influence on underfrequency load shedding[J]. Electric Power, 2009, 42(8):1-5.
[3]赵强,赵良,马世英,等.南方电网系统频率特性及低频减载方案[J].中国电力,2010, 43(5):7-11.ZHAO Qiang, ZHAO Liang, MA Shiying, et al.Frequency characteristics and under-frequency load shedding schemes for China Southern Power Grid[J].Electric Power, 2010,43(5):7-11.
[4]郭晓冬.基于广域测量(WAMS)的低频减载研究[D].武汉:华中科技大学,2006.
[5]侯王宾,刘天琪,李兴源.基于综合权值和广域测量的低频减载[J].电力系统保护与控制,2011,39(21):70-75.HOU Wangbin, LIU Tianqi, LI Xingyuan. Under frequency load shedding based on comprehensive weight and wide area measurement system[J]. Power System Protection and Control, 2011, 39(21):70-75.
[6] RUDEZ U, MIHALIC R. Monitoring the first frequency derivative to improve adaptive underfrequency loadshedding schemes[J]. IEEE Transactions on Power Systems,2011,26(2):839-846.
[7]张曼,缪源诚,常宝立,黄志光,时艳强.考虑负荷频率特性的可中断负荷切除策略研究[J].电力工程技术,2018,37(05):155-160.ZHANG Man, MIAO Yuancheng, CHANG Baoli, et al.Interruptible load shedding scheme considering load frequency characteristics[J]. Electric Power Engineering Technology, 2018, 37(05):155-160.
[8]赵希才,徐光福.频率保护与分布式发电[J].供用电,2017,34(02):28-31.ZHAO Xicai, XU Guangfu. Frequency protection and distribution generation[J]. Distribution&Utilization,2017, 34(02):28-31.
[9]李琳,罗剑波,周霞,等.基于风险管理的过载切负荷策略制定[J],电网技术,2013,37(3):821-826.LI Lin, LUO Jianbo, ZHOU Xia, et al. Risk managementbased drafting of overload load shedding strategy[J].Power System Technology, 2013, 37(3):821-826.
[10]吴耀东,梁海峰,高亚静,等.基于潮流追踪算法的自适应低频减载策略研究[J].中国电力,2015,48(03):61-66.WU Yaodong,LIANG Haifeng, GAO Yajing, et al.Research on adaptive UFLS strategy based on power flow tracing algorithm[J]. Electric Power, 2015, 48(03):61-66.
[11] ANDERSON P M,FOUAD A A. Power system control and stability[M]. Piscataway:EEE Press WileyInterscience, 2003:53-80.
[12]张执超,王增平,方攀宇.基于频率和电压稳定的紧急控制策略研究[J].电力系统保护与控制,2013,41(3):149-155.ZHANG Zhichao, WANG Zengping, FANG Panyu.Emergency control strategy based on frequency and voltage stability[J]. Power System Protection and Control, 2013,41(3):149-155.
[13]侯玉强,方勇杰,杨卫东,等.综合电压频率动态交互影响的自动减负荷控制新方法[J].电力系统自动化,2010,34(5):24-28.HOU Yuqiang, FANG Yongjie, YANG Weidong, et al. A new method of automatic load shedding control based on the voltage and frequency dynamic interaction[J].Automation of Electric Power Systems, 2010, 34(5):24-28.
[14]黄镔,赵良,马世英,等.基于PV曲线的低压减载配置方法[J].电网技术,2008,32(23):26-34.HUANG Bin, ZHAO Liang, MA Shiying, et al. Under voltage load shedding configuration based on PV curve[J].Power System Technology, 2008, 32(23):26-34.
[15] NIZAM M, MOHAMED A, HUSSAIN A. Dynamic voltage collapse prediction in power systems using power transfer stability index[C]. Putra Jaya:2006 IEEE International Power and Energy Conference, 2006:246-250.
[2]陈桥平,蔡泽祥,李爱民,等.互联电网的地区频率特性差异性及其对低频减载的影响研究[J].中国电力,2009,42(8):1-5.CHEN Qiaoping, CAI Zexiang, LI Aimin, et al. Study on difference of regional frequency characteristics of interconnected power system and its influence on underfrequency load shedding[J]. Electric Power, 2009, 42(8):1-5.
[3]赵强,赵良,马世英,等.南方电网系统频率特性及低频减载方案[J].中国电力,2010, 43(5):7-11.ZHAO Qiang, ZHAO Liang, MA Shiying, et al.Frequency characteristics and under-frequency load shedding schemes for China Southern Power Grid[J].Electric Power, 2010,43(5):7-11.
[4]郭晓冬.基于广域测量(WAMS)的低频减载研究[D].武汉:华中科技大学,2006.
[5]侯王宾,刘天琪,李兴源.基于综合权值和广域测量的低频减载[J].电力系统保护与控制,2011,39(21):70-75.HOU Wangbin, LIU Tianqi, LI Xingyuan. Under frequency load shedding based on comprehensive weight and wide area measurement system[J]. Power System Protection and Control, 2011, 39(21):70-75.
[6] RUDEZ U, MIHALIC R. Monitoring the first frequency derivative to improve adaptive underfrequency loadshedding schemes[J]. IEEE Transactions on Power Systems,2011,26(2):839-846.
[7]张曼,缪源诚,常宝立,黄志光,时艳强.考虑负荷频率特性的可中断负荷切除策略研究[J].电力工程技术,2018,37(05):155-160.ZHANG Man, MIAO Yuancheng, CHANG Baoli, et al.Interruptible load shedding scheme considering load frequency characteristics[J]. Electric Power Engineering Technology, 2018, 37(05):155-160.
[8]赵希才,徐光福.频率保护与分布式发电[J].供用电,2017,34(02):28-31.ZHAO Xicai, XU Guangfu. Frequency protection and distribution generation[J]. Distribution&Utilization,2017, 34(02):28-31.
[9]李琳,罗剑波,周霞,等.基于风险管理的过载切负荷策略制定[J],电网技术,2013,37(3):821-826.LI Lin, LUO Jianbo, ZHOU Xia, et al. Risk managementbased drafting of overload load shedding strategy[J].Power System Technology, 2013, 37(3):821-826.
[10]吴耀东,梁海峰,高亚静,等.基于潮流追踪算法的自适应低频减载策略研究[J].中国电力,2015,48(03):61-66.WU Yaodong,LIANG Haifeng, GAO Yajing, et al.Research on adaptive UFLS strategy based on power flow tracing algorithm[J]. Electric Power, 2015, 48(03):61-66.
[11] ANDERSON P M,FOUAD A A. Power system control and stability[M]. Piscataway:EEE Press WileyInterscience, 2003:53-80.
[12]张执超,王增平,方攀宇.基于频率和电压稳定的紧急控制策略研究[J].电力系统保护与控制,2013,41(3):149-155.ZHANG Zhichao, WANG Zengping, FANG Panyu.Emergency control strategy based on frequency and voltage stability[J]. Power System Protection and Control, 2013,41(3):149-155.
[13]侯玉强,方勇杰,杨卫东,等.综合电压频率动态交互影响的自动减负荷控制新方法[J].电力系统自动化,2010,34(5):24-28.HOU Yuqiang, FANG Yongjie, YANG Weidong, et al. A new method of automatic load shedding control based on the voltage and frequency dynamic interaction[J].Automation of Electric Power Systems, 2010, 34(5):24-28.
[14]黄镔,赵良,马世英,等.基于PV曲线的低压减载配置方法[J].电网技术,2008,32(23):26-34.HUANG Bin, ZHAO Liang, MA Shiying, et al. Under voltage load shedding configuration based on PV curve[J].Power System Technology, 2008, 32(23):26-34.
[15] NIZAM M, MOHAMED A, HUSSAIN A. Dynamic voltage collapse prediction in power systems using power transfer stability index[C]. Putra Jaya:2006 IEEE International Power and Energy Conference, 2006:246-250.