基于自适应下垂控制的微电网控制策略研究

Research on control strategy for microgrid based on adaptive droop control

感应电动机负荷的起动和功率变化对微电网孤岛运行时的电能质量及功率平衡影响较大,因此提出了一种自适应暂态下垂控制方法。该方法在传统下垂控制中引入暂态分量、功率与下垂系数的一次函数项,以改善下垂控制的动态性能和均流效果。针对含有感应电动机负荷的微电网,采用基于分层控制结构的自适应暂态下垂控制和PQ控制相结合的协调控制策略。利用PSCAD/EMTDC进行仿真实验,仿真结果验证了所提自适应下垂控制方法的正确性和微电网协调控制策略的有效性。

The start and power change of induction motor load have a big influence on voltage, frequency and power balance of microgrid, especially of islanded microgrid. So an adaptive-transient droop control strategy is investigated. In the proposed method, a linear function of the power and droop coefficient and a transient component are introduced to improve the dynamic performance and power sharing of traditional droop control. The whole control strategy of microgrid, which contains induction motor load, is a combination of adaptive-transient droop control and PQ control based on hierarchical control. The simulation model of microgrid is implemented in PSCAD/EMTDC software. The simulation results verify the correctness of the proposed adaptive-transient droop control and the effectiveness of the microgrid control strategy.