基于多重逆变器复杂控制策略的微电网运行控制

The Operation and Control of Microgrid Based on the Complex Control Strategy of Multiple Inverters

针对传统的基于单个主控电源的主从控制和下垂控制存在的缺陷,本文借鉴传统电网的调频特性,提出了一种多重逆变器Droop-V/f-P/Q复杂控制策略用于微电网的运行控制,可充分利用负荷的频率特性,最大程度的避免微电网离并网转换时电源控制模式的切换,较好地实现离并网的平滑切换,有效地提高了微电网孤岛运行的可靠性。利用PSCAD/EMTDC软件搭建的微电网仿真模型验证了所提出的控制策略的正确性和可行性,为微电网的平滑切换和可靠运行提供了新的解决思路。

According to the shortcomings of the master-slave control of microgrid based on single master power and droop control,the characteristic of frequency modulation of traditional power grid is referenced in this paper,and the operation and control of microgrid is proposed based on the Droop-V/f-P/Q complex control strategy of multiple inverters.This method can take advantage of the frequency characteristic of load,avoid the sources control mode switching between grid-connected mode and islanded mode in most degree,and better achieve the smooth transiting of microgrid between grid-connected mode and islanded mode,which improve the operation reliability of microgrid in islanded mode.Finally,a simulation model for microgrid is developed on the PSCAD/EMTDC software,the correctness and feasibility of control method for the inverters is verified,which provide an effective way for the smooth transition and reliable operation of microgrid.