基于描述函数法的光伏直流并网系统稳定性分析  

Stability analysis of PV grid-connected DC system based on describing function method

作　　者：潘琪 朱玮珂 杨星星 何杭航 韦巍[2] PAN Qi;ZHU Wei-ke;YANG Xing-xing;HE Hang-hang;WEI Wei(State Grid Jiangsu Electric Power Company Suzhou Electric Power Supply Company,Suzhou 215000,China;College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]国网江苏省电力公司苏州供电公司,江苏苏州215000 [2]浙江大学电气工程学院,浙江杭州310027

出　　处：《能源工程》2021年第1期79-88,共10页Energy Engineering

基　　金：国家电网江苏电力股份有限公司技术研究项目。

摘　　要：功率控制和电压控制是光伏并网系统的两种常见控制方式,采用传统小信号分析方法对电压控制下的光伏并网系统进行稳定性分析,采用描述函数法对基于扰动观察法的功率控制下的光伏并网系统的非线性部分进行建模与分析。分析了系统参数、控制参数、光伏接入位置等因素在不同控制方式下对光伏并网系统的影响,并从性能和稳定性方面对比了两种光伏并网控制方式。Power control method and voltage control method are two common control methods of the photovoltaic grid-connected system. In this paper, the traditional small signal method is adopted to analyze the stability of the photovoltaic grid-connected system under voltage control, and the describing function method is adopted to model and analyze the nonlinear part of the system under the power control based on perturbation and observation(P&O) method. The influence of system parameters, control parameters, photovoltaic access location on the grid-connected system under different control conditions are analyzed, and the two control methods are compared in terms of performance and stability.

关 键 词：光伏并网系统 功率控制 电压控制 描述函数法 

分 类 号：TM71[电气工程—电力系统及自动化]