基于自适应虚拟电阻的低压微电网有功均分下垂控制策略

Active power sharing droop control strategy for low-voltage microgrid based on adaptive virtual resistanc

由于低压微电网中各分布式电源的线路阻抗不匹配,传统的下垂控制策略难以按照下垂系数合理分配有功功率。为此,提出一种无需通信的自适应虚拟电阻下垂控制方法。通过将微电网中每个分布式发电机(DG)单元输出的有功功率和电压传送给自适应虚拟电阻控制器中,在保证电压和频率稳定控制的前提下实现功率按逆变器容量比例进行精确分配。论文对改进方法的微电网逆变器进行小信号稳定性分析,以优化控制器有关控制参数。仿真和实验结果验证了所提控制方法的有效性。

Due to the unmatched line impedance among distributed generators in the low-voltage micro-grid,reasonable distributing active power according to droop gain is difficult by using the traditional droop control.Therefore,an adaptive virtual resistance-based droop control method without communication was proposed.By transmitting the active power and voltage output by each DG unit in the micro-grid to the a-daptive virtual resistance controller,the power can be accurately distributed according to the inverter ca-pacity ratio on the premise of ensuring the stable control of voltage and frequency.Small signal stability of the microgrid inverter was analyzed to optimize the control parameters of the controller.Simulation and experimental results verify effectiveness of the proposed control method.