一种适用于低压微网的下垂控制方法

由于传统的下垂控制方法对微网系统控制存在一定的局限性,提出一种基于阻抗复合控制的下垂控制方法。根据输出有功和无功实时动态改变下垂系数,利用动态变系数和暂态变系数的方法抵消线路阻抗的不匹配;采用开环和闭环补偿虚拟阻抗产生的电压降,在校正输出阻抗的同时避免虚拟阻抗产生的电压跌落,改善无功功率的动态和稳态均分特性;最后采用MATLAB/Simulink软件仿真验证所提出控制算法的可行性。

A Droop Control Method Suitable for Low Voltage Micro-grids

Because the traditional droop control method has some limitations in micro-grid control, a droop control method based on impedance compound control is proposed. According to the active and reactive power output, the droop coefficient can be changed dynamically in real time, and the mismatch of the line impedance is eliminated by using the dynamic variable coefficient and the transient variation coefficient method. The open loop and the closed loop are used to compensate the voltage drop caused by the virtual impedance. The voltage drop caused by the virtual impedance is avoided while correcting the output impedance. The dynamic and steady-state equipartition characteristics of reactive power are improved. Finally, the feasibility of the proposed control algorithm is verified by Matlab/Simulink software simulation.