基于双点检测SRAPF的环形配电系统背景谐波衰减策略研究

RESEARCH ON HARMONIC MITIGATING BASED ON DOUBLE POINT DETECTION OF SINGLE RESISTIVE ACTIVE POWER FILTER IN CLOSED-LOOP DISTRIBUTION SYSEMS

对于环型配电网,具有较高的供电可靠性,已然成为一种发展趋势,其线路电感与功率因数校正电容之间的谐振使得系统背景谐波电压谐振放大,导致电力系统中的谐波电压严重畸变。针对环形配电网中谐波谐振现象,提出一种基于双点检测单阻性有源滤波器(double point detection of single resistive active power filter,DPDSRAPF)的谐波衰减策略,即检测环形配电网中2个节点(其中一个节点为中点,另一节点为中点以外的节点)的谐波电压,而APF和非线性负载改变等工况下,具有更好的鲁棒性和谐波衰减效果。仿真分析和实验结果均验证该方案的正确性和有效性。

As a kind of development trend,the closed-loop distribution feeder has high power supply reliability. The harmonic resonance caused by capacitors for power factor correction and system inductors may lead to significant voltage distortion along the feeder. For this phenomenon,this paper proposes an double point detection of single resistive active power filter(DPDSRAPF)to damp out the harmonic resonance. The principle of the strategy is that the harmonic voltage of two nodes(one of the nodes is the midpoint,another node is outside the midpoint)are tested and APF is only installed at the middle point of the closed-loop distribution feeder. The proposed strategy has better capability of harmonic damping and harmonic mitigating,especially in response to variation of line impedance and non-linear loads. Both simulation and experiment results have been provided to validate the proposed strategy.