基于模糊控制的广域阻尼控制器设计

Design of Wide Area Damping Controller Based on Fuzzy Control

针对互联电力系统低频振荡问题,提出了一种用广域反馈信号作为附加稳定信号的励磁控制器的设计方法广域信号传输存在的通信时滞用模糊控制方法进行补偿。描述了确定模糊推理规则的方法,首先分析模糊逻辑控制器的输入量和理想输出量,根据输入量和输出量之间的关系确定模糊论域、隶属度函数和模糊推理规则,从而建立模糊逻辑控制器。用Matlab/Simulink软件对4机2区域系统进行仿真,测试模糊广域阻尼控制器性能仿真结果表明,所设计的控制器能补偿通信过程中存在的较大时滞,增加互联电力系统阻尼仿真结果验证了模糊控制具有较好的鲁棒性和适应性。

In view of the low frequency oscillations of the interconnected power systems, a method is proposed for designing the excitation controller by using the wide-area feedback signals as additional stability signals. Fuzzy control is applied to compensate the communication time delay during transmission of the wide-area signals. A new method is introduced for determining the fuzzy rules. Firstly, the inputs and expected outputs of fuzzy logic controller are analyzed. Then, the universe of fuzzy sets, membership functions and fuzzy rules are determined based on the relationship between the relevant inputs and outputs, and the fuzzy logic controller is constituted consequently. A four-machine two-area power system is simulated by using Matlab/Simulink software in order to test the performance of the fuzzy control-based wide-area damping controller. Simulation results show that the designed controller can effectively compensate the large time delay and improve the damping of interconnected power system, which verifies the good robustness and adaptability of fuzzy control.