兼顾谐波补偿和三相有功调节功能的不平衡控制策略研究
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摘要
采用兼顾谐波补偿和三相有功调节功能的不平衡控制策略,能够对负载不平衡的三相四线制系统进行调节,平衡三相电流,补偿无功和谐波,提高系统的电能质量。使用单相谐波检测算法,提取出各相基波有功电流,取其均值作为三相平衡时各相电流目标值。通过调节器控制,在负载侧电流不变的情况下,对网侧电流进行重新分配,使之达到平衡状态,消除无功、谐波并降低中性线电流。仿真和试验结果均证明了该方法的正确性和可行性。
The proposed control strategy can adjust the three-phase four-wire system with unbalanced load,balance the three-phase currents,compensate reactive power and harmonics,and improve the power quality of the system.The single harmonic detection algorithm is used to extract the fundamental active currents,and the mean of the fundamental active currents is as the three-phase balanced current values.Through the regulator control,under the condition that the load side current remains unchanged,the network side current is redistributed to achieve a balanced state,eliminating reactive power,harmonics and reducing the neutral line current.The simulation and experimental results show that the method is correct and feasible.
The proposed control strategy can adjust the three-phase four-wire system with unbalanced load,balance the three-phase currents,compensate reactive power and harmonics,and improve the power quality of the system.The single harmonic detection algorithm is used to extract the fundamental active currents,and the mean of the fundamental active currents is as the three-phase balanced current values.Through the regulator control,under the condition that the load side current remains unchanged,the network side current is redistributed to achieve a balanced state,eliminating reactive power,harmonics and reducing the neutral line current.The simulation and experimental results show that the method is correct and feasible.
引文
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[10] 黄海宏,刘鑫,薛欢,等.基于载波相移技术的H桥级联高压APF研究[J].电子测量与仪器学报,2012,26(8):687-692.
[11] 黄海宏,杨佳能,吴晓,等.改进单相谐波检测算法在三相四线制APF的应用[J].电子测量与仪器学报,2016,30(1):133-140.
[12] 张晓滨,钟彦儒,王小艳.无功、负序及谐波电流检测中的数字滤波器研究[J].电工技术学报,2011,26(8):138-144.
[2] 方恒福,盛万兴,王金丽,等.配电台区三相负荷不平衡实时在线治理方法研究[J].中国电机工程学报,2015,35(9):2185-2193.
[3] 周恒逸,齐飞,毛柳明,等.基于SVG调节配变三相不平衡电流的应用研究[J].高压电器,2016,52(5):48-53.
[4] 黄海宏,王钰,许若冰,等.双环重复控制三相四线制有源电力滤波器[J].电力自动化设备,2016,36(4):40-45.
[5] 庞庆,彭琪,余祥,等.三相四线制APF谐波检测和控制策略的研究[J].电力电子技术,2018,52(6):96-100.
[6] 刘桂英,粟时平,秦志清.应用多倍频旋转坐标正交变换的三相四线制电路谐波检测方法[J].电网技术,2010,34(7):87-93.
[7] 汤胜清,程小华.一种基于多层前向神经网络的谐波检测方法[J].中国电机工程学报,2006,26(18):90-94.
[8] SUDIPTA N,PAMPA S,SWAPAN K G.A wavelet based novel method for the detection of harmonic sources in power systems[J].International Journal of Electrical Power and Energy Systems,2012,40(1):945-949.
[9] 杜少武,吴义敏,黄海宏.一种基于DSP的单相谐波检测方法的研究[J].电力电子技术,2012,46(2):80-82.
[10] 黄海宏,刘鑫,薛欢,等.基于载波相移技术的H桥级联高压APF研究[J].电子测量与仪器学报,2012,26(8):687-692.
[11] 黄海宏,杨佳能,吴晓,等.改进单相谐波检测算法在三相四线制APF的应用[J].电子测量与仪器学报,2016,30(1):133-140.
[12] 张晓滨,钟彦儒,王小艳.无功、负序及谐波电流检测中的数字滤波器研究[J].电工技术学报,2011,26(8):138-144.