摘要
针对低电压微电网中带非线性负荷的多逆变器并联系统,提出了一种分频虚拟电阻的多逆变器并联控制策略。对每个逆变器的输出电流采用带通滤波器进行分频,得到各次谐波电流;通过将各次虚拟电阻分别引入到逆变器输出的各次谐波电流反馈环中,得到各次指令谐波电压,从而对电压控制环进行修正。该方法既可减小逆变器在各次谐波频率下的等效输出电阻,也能分担各次谐波功率,有效地改善了各并联逆变器输出电压质量。通过改进阻性逆变器的功率下垂控制策略,提高了多逆变器并联的功率均分精度和动态响应速度。仿真和实验结果验证了该控制策略的有效性。
A frequency-divided virtual resistance based control strategy is proposed for multi parallel inverters supplying power to non-linear load in low-voltage microgrid. The frequency of output current of each inverter is divided by bandpass filter to obtain harmonic current of different orders;through leading virtual resistance of different orders into feedback loop for harmonic current of different orders, which are outputted by inverter respectively, the instruction for harmonic voltage of different orders are obtained, thus the voltage control loops are corrected. The proposed method not only can decrease the equivalent output resistances under frequencies of different order of harmonics, but also can make parallel inverters sharing harmonic power of different orders, so the voltage quality outputted by parallel inverters can be effectively improved. By means of improving the droop control strategy for resistive inverters, the accuracy of power equipartition among multi parallel inverters and dynamic response speed of them can be improved. The effectiveness of the proposed control strategy is validated by results of simulation and experiments.
出处
《电网技术》
EI
CSCD
北大核心
2013年第11期3276-3280,共5页
Power System Technology
基金
国家自然科学基金重点项目(51237003)
国家重点基础研究发展计划项目(973项目)(2009CB219706)
教育部新世纪优秀人才支持计划项目(NCET-10-0367)
湖南省自然科学基金重点项目(11JJ2023)~~
关键词
微电网
逆变器并联
分频
虚拟电阻
改进下垂控制
microgrid parallel inverter frequency division virtual resistor improved droop control
作者简介
彭自强（1988），男，硕士研究生，研究方向为微电网中的多逆变器并联控制，E-mail：pengziqiang12@163．com；
罗安（1957），男，教授，博士生导师，研究方向为电能质量控制和微电网控制。
