基于固定时间一致性算法的孤岛微电网分布式容错二次控制策略

随着微电网信息侧和物理侧的耦合日益紧密，软件密集型控制器和电力电子设备的大规模应用增加了微电网遭受攻击和故障的可能性，从而影响微电网的稳定运行。为此，针对孤岛交流微电网控制通道中潜在的执行器故障和传感器故障，提出了一种基于固定时间一致性算法的分布式容错二次控制策略。首先，建立了同时计及执行器故障和传感器故障的下垂控制模型。其次，分别设计了上层分布式一致性控制算法和下层本地容错控制算法，分析了控制器对未知故障的抑制机理，从理论上证明了所提分布式容错二次控制策略的固定时间收敛特性，并进一步观测了传感器故障信号的波形。最后，算例仿真结果验证了所提控制策略的有效性。

Distributed fault-tolerant secondary control strategy for islanded microgrid based on fixed-time consensus algorithm

With the increasingly close coupling between the cyber layer and the physical layer of microgrid, the large-scale application of software-intensive controllers and power electronic devices increases the possibility of attacks and faults of the microgrid, thereby affecting the stable operation of the microgrid. For the potential actuator faults and sensor faults in the control channel of the islanded AC microgrid, a distributed fault-tolerant secondary control strategy based on fixed-time consensus algorithm is proposed. Firstly, a droop control model considering both actuator faults and sensor faults is established. Secondly, distributed consensus control algorithms and fault-tolerant control algorithms are designed in the upper layer and lower layer respectively. The mitigating mechanism of the controllers for the unknown faults is analyzed, and the fixed-time convergence characteristics of the proposed strategy are theoretically proved. Furthermore, the signal of sensor faults is estimated. Finally, the simulation example verifies the effectiveness of the proposed control strategy.