孤岛微电网下的单相H桥并网逆变器系统稳定性分析

Stability Analysis of Single-Phase H-Bridge Grid Connected Inverter System in Islanded Microgrid

分布式发电是新型清洁能源发电的主要能源框架之一,微电网更是组成分布式发电各部分的整体代名词。孤岛微电网下会存在各种类型的微源,一般是由下垂控制将单相逆变器进行并联至大电网中。本文针对并网逆变器稳定性这一问题,对逆变器建立阻抗模型,采用电压电流双闭环控制,利用系统开环伯德图探索电压电流环参数对系统稳定性的影响。

Distributed generation is one of the main energy framework of new clean energy generation,and microgrid is the whole synonym of all parts of distributed generation.There are many kinds of micro sources in the islanding microgrid.Generally,the single-phase inverter is connected to the large grid by droop control.Aiming at the stability of grid connected inverter,this paper establishes impedance model of inverter,uses voltage and current double closed-loop control,and uses open-loop Bode diagram to explore the influence of voltage and current loop parameters on system stability.