摘要
传统下垂控制方法会引起无互联线逆变器并联系统的误调节。该文在考虑逆变器输出阻抗和线路阻抗中阻性分量的基础上,分析了因逆变器模块滤波电感和线路阻抗差异造成的无功分配不均的原因,提出了功率下垂解耦控制方法。该方法可以消除并联系统的误调节,但并不能改善功率分配不均的现象。分析得知,逆变器模块较大的输出电压幅值将使该逆变器发出较大的有功功率和无功功率,由此提出了改进型的功率解耦控制策略,该方法可以使功率分配不均的现象得到改善。原理试验样机验证了所提控制方法的正确性和先进型。
In the paralleled inverters without control interconnection, the traditional droop characteristic may result in rnisregulation at the instance of hot-parallel. Considering of the resistive component in the output impedance and line impedance, the reason of the active and reactive power sharing improperly is analyzed. The decouple droop control scheme is presented. In this control scheme, the misregulation can be eliminated but the improper power sharing problem can not be improved. The inverter modular with the larger voltage amplitude will export the larger active and reactive power. The improved power decouple control scheme is proposed, which can improve the condition of the power sharing. The validity and advancement of the proposed control scheme have been verified by the experimental results.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2008年第21期40-45,共6页
Proceedings of the CSEE
关键词
逆变器
并联
功率均分
解耦控制
参数差异
inverter
parallel operation
power sharing
decoupling control
parameters unbalance
