基于改进型P/Q控制的多源微电网功率脉动抑制

针对微电网三相不对称负载引起的功率脉动严重影响供电质量的问题,提出基于正负序信号解耦的改进型P/Q控制策略.利用叠加原理将并网点采集的实时信号分解,提取出各自独立、三相平衡的正负序分量,设计陷波器实现正负序分量的解耦控制,通过抑制负序电流分量降低功率脉动.仿真结果证明:提出的控制策略能够准确地对脉动电流正负序分量进行解耦控制,在保证正序分量有效输出的同时,将负序分量降到最低,改进后功率脉动降低了50%.

Power pulsation suppression of multi-source microgrid based on improved P/Q control

In order to solve the problem that power pulsation caused by three-phase imbalanced load seriously damages the quality of power supply in a microgrid, an improved P/Q control strategy based on decoupling of positive and negative sequence signals was proposed. The real-time signals collected from grid-connected points were decomposed through superposition principle, and positive and negative sequence components both independent with three-phase balance were extracted. A notch filter was designed to realize the decoupling control of positive and negative sequence components. The power pulsation was reduced by suppressing the negative sequence current. Simulation results show that the positive and negative components of pulsation current can be accurately decoupled and controlled with the as-proposed control strategy. The positive component can be effectively output, and the negative component can be minimized at the same time. As a result, the power pulsation reduces by 50%.