一种基于改进S变换的三相不平衡检测方法
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摘要
随着我国电动汽车电力产业的快速发展,配电网中电动汽车充电桩大量接入。分布式的充电桩一般采用单相交流供电方式,导致配电网电压不平衡,使得系统损耗增加,甚至危及系统的安全。准确、快速地检测配电网的不平衡具有至关重要的意义。基于S变换的思想提出一种新型三相不平衡检测方法。通过引入2个调节因子,提高基波幅值和相位的检测速度和精确度,增强不平衡度检测效果。仿真和实验证明了所提出方法的有效性。
With the development of electric vehicle,EV charger is wildly used in power system. Power supply for the distributed EV charger is single-phase AC,it will result in the problem of distribution network imbalance. This may increase system loss,even damage the safe operation of the system. Accurate and fast detection of distribution network imbalance is significant. Based on the idea of S transform,a new three-phase imbalance detection method was proposed. By introducing two adjusting factors,the detection speed and accuracy of the amplitude and phase of the fundamental wave could be improved,and the detection effect of unbalance degree could be enhanced. Simulations and experiments show the effectiveness of the proposed method.
With the development of electric vehicle,EV charger is wildly used in power system. Power supply for the distributed EV charger is single-phase AC,it will result in the problem of distribution network imbalance. This may increase system loss,even damage the safe operation of the system. Accurate and fast detection of distribution network imbalance is significant. Based on the idea of S transform,a new three-phase imbalance detection method was proposed. By introducing two adjusting factors,the detection speed and accuracy of the amplitude and phase of the fundamental wave could be improved,and the detection effect of unbalance degree could be enhanced. Simulations and experiments show the effectiveness of the proposed method.
引文
[1]曾祥君,胡京莹,王媛媛,等.基于柔性接地技术的配电网三相不平衡过电压抑制方法[J].中国电机工程学报,2014,34(4):678-684.
[2]董雷,何林,蒲天骄.中性点接地方式对配电网可靠性的影响[J].电力系统保护与控制,2013,41(1):96-101.
[3]郭谋发,黄建业,杨耿杰.谐振接地系统故障区段模糊信息融合定位方法[J].电力系统保护与控制,2012,40(10):65-70.
[4]丛伟,孙允,刘国强,等.基于恒频注入信号计算配电网分布电容的方案与应用[J].电网技术,2013,37(10):2938-2944.
[5] GB/T 15543-2008.电能质量三相电压不平衡[S].2008.
[6]林海雪,李世林,刘惠民.电压电流频率和电能质量国家标准应用手册[M].北京:中国电力出版社,2001.
[7] Ming S,Demirtas S,Sahinoglu Z. Joint Voltage and Phase Unbalance Detector for Three Phase Power Systems[J]. IEEE Signal Processing Letters,2013,20(1):11-14.
[8] GB/T 15543—2009.电能质量三相电压不平衡[S]. 2009.
[9]周林,张有玉,刘强,等.三相不平衡度算法的比较研究[J].华东电力,2010,2(38):212-215.
[10] Ghijselen J A L,Van den Bossche A P M. Exact Voltage Unbalance Assessment Without Phase Measurements[J]. IEEE Transactions on Power Systems,2005,20(1):519-520.
[11] Furfari F A,Brittain J. Charles LeGeyt Fortescue and the Method of Symmetrical Components[J]. IEEE Industry Applications Magazine,2002,8(3):7-9.
[12]成达,温和,滕召胜,等.一种三相不平衡度相量快速算法[J].电测与仪表,2014,51(16):67-72.
[13] Zhao F,Yang R. Power-quality Disturbance Recognition Using S-transform[J]. IEEE Transactions on Power Delivery,2007,22(2):944-950.
[14]唐求,滕召胜,高云鹏,等.基于S变换的平方检测法测量电压闪变[J].中国电机工程学报,2012,32(7):60-67.
[2]董雷,何林,蒲天骄.中性点接地方式对配电网可靠性的影响[J].电力系统保护与控制,2013,41(1):96-101.
[3]郭谋发,黄建业,杨耿杰.谐振接地系统故障区段模糊信息融合定位方法[J].电力系统保护与控制,2012,40(10):65-70.
[4]丛伟,孙允,刘国强,等.基于恒频注入信号计算配电网分布电容的方案与应用[J].电网技术,2013,37(10):2938-2944.
[5] GB/T 15543-2008.电能质量三相电压不平衡[S].2008.
[6]林海雪,李世林,刘惠民.电压电流频率和电能质量国家标准应用手册[M].北京:中国电力出版社,2001.
[7] Ming S,Demirtas S,Sahinoglu Z. Joint Voltage and Phase Unbalance Detector for Three Phase Power Systems[J]. IEEE Signal Processing Letters,2013,20(1):11-14.
[8] GB/T 15543—2009.电能质量三相电压不平衡[S]. 2009.
[9]周林,张有玉,刘强,等.三相不平衡度算法的比较研究[J].华东电力,2010,2(38):212-215.
[10] Ghijselen J A L,Van den Bossche A P M. Exact Voltage Unbalance Assessment Without Phase Measurements[J]. IEEE Transactions on Power Systems,2005,20(1):519-520.
[11] Furfari F A,Brittain J. Charles LeGeyt Fortescue and the Method of Symmetrical Components[J]. IEEE Industry Applications Magazine,2002,8(3):7-9.
[12]成达,温和,滕召胜,等.一种三相不平衡度相量快速算法[J].电测与仪表,2014,51(16):67-72.
[13] Zhao F,Yang R. Power-quality Disturbance Recognition Using S-transform[J]. IEEE Transactions on Power Delivery,2007,22(2):944-950.
[14]唐求,滕召胜,高云鹏,等.基于S变换的平方检测法测量电压闪变[J].中国电机工程学报,2012,32(7):60-67.