基于P/δ下垂控制的低压微电网频率控制策略

Control strategy for low-voltage microgrid frequency based on P / δ droop control

负荷突变情况下,含储能电源孤岛状态下的微电网为了满足快速功率分配,一般采用高下垂增益系数,针对高下垂增益系数影响微电网频率和电压稳定的问题,提出了一种改进的P/δ控制,引入了有功微分增益和无功积分增益系数,减轻了因负荷扰动导致的电压和频率瞬时突变,减小了对微电网造成的冲击,。为了实现二次调压和二次调频设计了二次调节器,提高了微电网孤岛情况下受到负荷扰动时的暂态稳定性,搭建了仿真模型和硬件实验平台验证所提控制策略的有效性。

Since microgrid is facing sudden load change, the islanded microgrid operates at a high droop gain coeffi- cient to meet the rapid power distribution. However there are Contradictions＇ between high droop gain coefficient and the regulation of frequency and the voltage stability. This paper puts forwaxd an improved P/δ droop control which in- troduces the active differential gain and reactive integral gain coefficient. The strategy avoids the voltage and frequency mutations caused by load disturbance and reduces the impact on microgrid. ：In order to achieve the secondary voltage and frequency regulation, the quadratic regulator is added to improve the stability of the transient state of the micro- grid. Simulation and experiments improve the validity of the proposed control Strategy.