研究了基于传统模糊控制的VSC-HVDC控制系统,提出了一种新型的控制策略.基于线性反馈化理论,对内电流环进行了精确建模.同时,在设计外环控制时,将整个系统的控制过程细分为三个阶段,不同的阶段采取不同的控制方法.分析了该方法实现的机理,并基于Matlab与PSCAD仿真软件的互连,对其进行了软件仿真验证.结果表明,该方法能在保持传统模糊控制具有良好动态性能的同时,提高系统启动阶段控制性能,消除传统模糊控制产生的抖振现象从而改善稳态控制的效果,具有优良的综合性能.%A novel control strategy is proposed by analyzing the VSC-HVDC control system of classical fuzzy controller. Based on linear feedback theory, the inner loop current is modelled accurately. When outer loop is designed, the control process is divided into three stages and different control methods are used correspondingly. The realization mechanism of the proposed method is analyzed, and based on the inter-connection of Matlab and PSCAD, the software of the method is simulated and verified. The simulation results show that the designed controller can improve control performance when system started, while maintaining better dynamic performance and eliminating chattering of traditional fuzzy controller, thus to improve steady state control effect. It has an excellent comprehensive performance.This work is supported by National Natural Science Foundation of China (No. 50777066).
展开▼
