环形配电网的分频调节阻性有源电力滤波器位置策略

通过理论分析环形配电网的谐波放大原理,对比安装在线路中点且阻抗匹配的阻性有源电力滤波器(RAPF)和对称安装在不同位置的分频调节RAPF的抑制效果,提出了一种适用于环形配电网的分频调节RAPF的位置策略。若线路长度小于谐波波长的1/2,靠近线路中点的对称位置为最优安装位置;若线路长度大于谐波波长的1/2,距谐波源1/4波长的对称位置为最优安装位置。与安装在线路中点且阻抗匹配的RAPF相比,安装在最优位置的分频调节RAPF,当其电导增益≥匹配的电导时,均能有效地衰减谐波,获得更好的抑制效果;且电导增益越大,谐波抑制效果越好。同时,该方案对线路参数的改变具有更好的适应性。仿真和实验结果验证了该方案的有效性。

Site Selection Strategy of Discrete Frequency Tuned Resistive Active Power Filter for Harmonic Damping in Loop Power Distribution Systems

This paper analyzes the harmonic resonance theory according to the distributed parameter model of the loop feeder. Through the comparisons of the harmonic damping effects between resistive active power filter (RAPF) installed on middle bus and that symmetrically deployed on different locations, this paper proposes a site selection strategy of discrete frequency tuned RAPF to dampen harmonic propagation in loop power distribution systems. Specifically, the proposed site selection strategy notes that if the feeder length is shorter than half wavelength, the optimal installation location should be symmetrical location close to the middle point; otherwise, if the feeder length is longer than half wavelength, the optimal installation location should be symmetrical position which is a quarter wavelength away from the source. Compared with the case when the RAPF with matching impedance is installed on the middle bus of the loop line, it can achieve better harmonic attenuation effect to install discrete frequency tuned RAPF whose conductance is no less than the matching conductance. Moreover, bigger conductance leads to better damping result. Besides, the proposed strategy shows better adaptability to the variations of line parameters. Simulation and experimental results verify the validity of the proposed strategy.