基于谐波分解的光储一体化变流器控制策略及储能容量选取方法

Control strategy of integrated photoenergy storage converter based on harmonic decomposition and energy storage capacity selection method

传统光储一体化变流器控制策略中通常认为电网电压质量较好,忽略电网电压谐波分量的干扰,难以满足工程实际要求。此外,由于光伏发电出力具有间歇性和随机性,在多时间尺度下其输出功率呈现严重的多峰值非线性特性。如何选取合适的光储一体化储能系统容量,并与光伏出力特性相匹配,对平抑光伏出力波动和系统电压及频率的稳定具有重大意义。针对上述问题,对电网电压谐波进行了分类,在充分考虑电网电压谐波分量影响的前提下,提出了基于谐波分解法的光储一体化变流器改进控制策略,同时给出了一种应用于光储一体化变流器系统中储能容量选择的方法。通过搭建基于Simulink的仿真模型,验证了本文所提控制方法和储能容量选取方法的有效性和正确性。

The three-phase grid-connected converter control strategy,which applies to the battery energy storage system,generally ignores the interference of harmonic components in the grid voltage.As a result,it is difficult to meet the practical application requirements.To deal with this problem,it is necessary to optimize and improve the traditional control strategy,taking harmonics into consideration.And its bases are analysis of the harmonic characteristics and study of its control mechanism in the grid-connected converter.This paper proposes a method of harmonic decomposition,classifies the grid voltage harmonics and explores the control mechanism in the gridconnected converter.With the help of the simulation model built by Matlab/Simulink,the comparative simulation of the energy storage control system carried out under the control of the ideal grid voltage input and the actual one,verifies the correctness of the analytical method proposed in the article.