基于分频-模糊控制算法的微电网并网谐波抑制策略

为改善微电网电能质量,实现储能系统效率最大化。本文首先分析了微电网基本结构特性,在实现对谐波电流准确检测的基础上,提出一种基于比例矢量比例积分(Proportional vector proportional integral,PVPI)的储能变流器(Power Conversion System,PCS)分频控制策略,随后,利用PVPI分频控制所具有的频率选择特性,实现对特定次频率的谐波分量的抑制,同时,结合模糊算法对PVPI控制器进行比例积分系数的在线实时调整,提高动态响应性能,使储能变流器能够有效地利用自身剩余容量对微电网内部的谐波实现补偿,改善微电网的电能质量,最后,搭建微电网并网仿真模型,仿真结果证明了所提分频-模糊控制策略的有效性。

An Harmonic Grid-Connecting Current Suppression Strategy for Frequency Division-fuzzyControl Based Microgrid

In order to improve the power quality of microgrid, the efficiency of energy storage system is maximized. Based on the analysis of the structural characteristics of microgrid, this paper proposes a frequency division control strategy for energy storage converter based on proportional vector proportional integral, which uses the frequency selection characteristics of PVPI frequency division control to achieve harmonics for specific sub-frequency. The fuzzy adjustment algorithm is used to adjust the proportional coefficient and the integral coefficient of the PVPI controller, thereby effectively realize the frequency division control of the Power Conversion System(PCS) and making the storage. The energy converter can effectively utilize the remaining capacity of the converter to compensate the harmonics inside the micro grid and improve the power quality of the micro grid. The simulation results demonstrate the effectiveness of the proposed PVPI crossover control strategy.