微电网孤岛运行时,基于下垂控制的并联逆变器可以按照运行要求分担负荷功率,但稳态频率会存在静态偏差.利用有功功率及其延时值,使逆变器在动态过程中具有下垂特性,且不影响频率的稳态值,通过原有下垂系数的调整可以保证频率质量符合要求,保证稳态时有功功率的合理分配.利用MATLAB/Simulink搭建仿真模型,仿真结果表明:所提控制策略具有良好的动态与稳态控制效果.%Parallel inverters based on droop control can share load power according to operation demand for micro-grid in autonomous operating mode,but the steady-state frequency will have static deviation.In this paper,an inverter can have dynamic droop characteristic without influencing the steady-state frequency through using active power and its delayed value.Regulating the original droop coefficient can ensure qualified frequency and reasonable active power sha-ring in steady state.A simulation model is built by MATLAB/Simulink,and the simulation results show that the proposed control strategy has good dynamic and steady state control effects.
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