基于ARCTAN函数的孤岛微电网下垂控制研究

Research on droop control of islanded microgrid based on ARCTAN function

在微电网中,各并联逆变器大多采用下垂控制,微电网的频率会随着逆变器输出有功功率产生变化,进而会导致系统频率超出允许的偏差范围。针对上述问题,提出了一种改进的下垂控制方法。首先,以逆变器输出特性和下垂控制策略为基础,分析逆变器的频率随功率变化的原因;其次,在传统下垂控制的基础上,引入ARCTAN函数构造新的下垂曲线,使微电网的频率偏差被控制在±0.2Hz以内。通过Matlab/Simulink仿真平台建立逆变器并联系统模型,仿真验证所提控制策略的有效性。仿真结果表明:控制方法能够有效限制微电网的频率波动,增强微电网频率的稳定性,可为微电网逆变器并联频率控制的优化提供参考。

In a microgrid,droop control is employed by most parallel inverters.The frequency of the microgrid will change with the active power output of the inverter,which will lead to the system frequency exceeding the permissible deviation range.To address these issues,an enhanced droop control method is introduced.First,an analysis of the frequency variation with power is conducted based on inverter output characteristics and the droop control strategy.Second,based on the traditional droop control,the ARCTAN function is introduced to construct a new droop curve to make the microgrid frequency deviation controlled within±0.2Hz.The Matlab/Simulink simulation platform is utilized to establish the parallel inverter system model,and the effectiveness of the proposed control strategy is verified through simulation.The results show that the proposed control method can effectively limit the frequency fluctuation of the microgrid and enhance the stability of the microgrid frequency,which can provide a reference for the optimization of parallel frequency control of microgrid inverters.