自适应调节下垂系数的微电网控制策略

A Microgrid Control Strategy Based on Adaptive Drooping Coefficient Adjustment

针对采用传统下垂控制的分布式电源在孤岛运行时受负荷变化影响使其频率偏离额定值或电压幅值偏移较大,在并网运行时因配电网受到干扰后电压或频率出现波动致使输出功率不能保持恒定的缺陷,设计了一种能实现孤岛频率无静差、孤岛电压幅值小偏移量和并网恒功率输出的自适应调节下垂系数的控制器。同时,基于该下垂控制器的特点,提出了一种改进的微电网综合控制策略,即多重主从控制策略,以克服基于V/f的主从微电网系统控制和基于V/f的多主微电网系统控制中存在的不足。通过MATLAB/Simulink仿真平台验证了控制器和多重主从控制策略的有效性和可行性。

For conventional droop control,it is difficult to keep rated frequency or voltage amplitude within small deviations in island operation mode when the load changes,and it is also difficult to keep constant power output in the grid-connected operation mode when the frequency or voltage amplitude of the grid fluctuates.To address these problems,a droop controller with adaptive drooping coefficient adjustment is designed to remove static deviations in frequency and maintain small deviations in voltage amplitude in island mode and to maintain constant power output in grid-connected mode.Moreover,a multiple master-slave control strategy is proposed based on the droop controller to overcome the shortcomings of the master-slave microgrid system control and the multiple master microgrid system control based on V/f.MATLAB/Simulink simulation shows that the proposed droop controller and multiple master-slave control strategy are feasible and effective.