基于虚拟同步发电机的微电网控制策略研究

针对微电网中的分布式电源出力的间歇性导致微电网频率及电压不稳定的问题,通过建立虚拟同步发电机(V irtual Synchronous Generator, VSG)控制系统的数学模型,设计了一种基于频率控制、电压控制和功率控制的反馈控制器,并给出了相应的控制方法;通过理论分析分布式电源的频率、电压特性及其对微电网频率、电压稳定性的影响,提出了能够有效抑制分布式电.源功率波动,提高微电网电能质量的控制策略。仿真结果表明:VSG能稳定地控制微电网频率、电压,具有很好的稳态性。

Control strategy for microgrid based on virtual synchronous generator

Aiming at the problem of the frequency and voltage instability of the micro- grid caused bythe intermittence of distributed generations, by establishing a mathematical model of the virtualsynchronous generator (VSG) control system, designs feedback controller based on frequency control,voltage control and power control, gives corresponding control methods. By theoretically analyzing thefrequency and voltage characteristic of the distribution generations (DGs), and their effects onfrequency and voltage stability of the micro- grid, puts forward the effective control strategy ofrestraining the power fluctuation of DGs, improving the power quality of the micro grid. The simulationresult shows that VSG can stably control the micro- grid s frequency and voltage, and has fine stabilitystate characteristic.