基于虚拟阻抗的微电网功率控制研究

Study of the microgrid power control based on virtual impedance control

传统下垂控制方法难以实现输出阻抗不匹配的多并联逆变器协调控制。文中提出了基于虚拟阻抗的微网功率控制方法,该新型控制方法可有效实现多并联逆变器负荷均分控制;克服了传统下垂控制方法的响应速度慢、参数设计复杂、稳定裕度低的技术缺陷。文中通过MATLAB/Simulink搭建的仿真模型,有效验证了新型控制策略的有效性和可行性。

The coordination control of multiple parallel converters cannot be realized by the traditional droop control when the output impedance is asymmetrical. A novel control strategy based on a virtual resistance for parallel three phase inverters is proposed. It can achieve the load sharing capability and also overcome the drawbacks of the conventional droop control such as slow transient response, complex design, and limited stability margins. The effectiveness and feasibility of the novel control strategy is effectively verified in the MATLAB/Simulink.