孤岛微电网的分布式固定时间二次协调控制

Distributed fixed-time secondary coordination control of islanded microgrids

孤岛微电网的下垂控制策略会导致系统稳态的频率和电压偏离额定值.为此,提出一种分布式固定时间二次协调控制策略以实现系统频率和电压的恢复控制,并实现期望的有功功率分配.所提出的控制方法能在固定时间内完成二次控制目标,而不依赖于系统的初始状态.该优势使得根据任务需求来离线预设整定时间成为可能.同时,采用固定时间Lyapunov方法分析二次协调控制系统的稳定性.最后,通过Matlab/Simulink仿真实验验证分布式固定时间二次控制策略的有效性.

To compensate for the frequency and voltage deviation caused by droop control, a fixed-time distributed secondary coordination control scheme is proposed to restore the frequency and voltage to their nominal values and achieve the desired active power sharing property. The proposed scheme can achieve the secondary control objectives within a fixed-time, which is independent of the initial conditions. This advantage makes it possible to off-line predesign the settling time according to task requirement. The stability of the proposed secondary control scheme is rigorously proved by applying the fixed-time Lyapunov stability theory. Finally, results of the simulation with Matlab/Simulink verify the effectiveness of the proposed distributed fixed-time secondary control scheme.