基于VSG的多微网二次调频控制

VSG-based Secondary Frequency Modulation Control for Multi-microgrids

在多微网系统中,负荷变动和电源输出波动容易导致频率偏移和能量传输不稳定。针对这一情况提出了基于虚拟同步发电机(VSG)技术的多微网二次调频策略。采用改进的VSG控制取代传统下垂控制,加强了应对负荷变动的抗干扰能力,使得整个系统的频率调整以及能量传输更可靠。仿真以两个微电网系统为例,对单微网和双微网负荷波动的情况加以研究。结果表明,方案在实现微电网相互支援的同时,能有效完成平滑调频和稳定传输能量的任务。

As load change and power output fluctuation could easily lead to frequency offset and unstable energy transmission in the multi-microgrid system,a VSG-based frequency modulation strategy was proposed for multi-microgrids.Traditional droop control was replaced by improved VSG control to strengthen anti-interference ability to deal with load change,so that frequency adjustment and energy transmission of the entire system might be more reliable.In the simulation,two microgrid systems were taken as examples to study load fluctuations of single microgrid and double microgrids.The results show that the proposed scheme could effectively fulfill the task of smooth frequency modulation and stable energy transmission,in addition to realizing mutual support among microgrids.