基于FCS-MPC的五桥臂UPQC电能质量补偿策略研究

A power quality compensation strategy of five-leg UPQC based on FCS-MPC

针对容错模式下的统一电能质量调节器(Unified Power Quality Conditioner,UPQC),提出了一种五桥臂形式的新型拓扑结构,实现故障下的电能质量扰动综合补偿。在此基础上,对串联变流器和并联变流器进行统一建模,提出了一种基于有限集模型预测控制(Finite Control Set Model Predictive Control,FCS-MPC)的五桥臂UPQC控制策略。相比传统线性控制策略,所提算法构建了统一的预测模型以及整合优化的价值函数,实现串联变流器与并联变流器的协同控制,提高了两侧变流器的补偿精度、暂态性能以及响应速度,有效降低了控制算法的复杂度和参数调节难度,并具有较高的参数鲁棒性。仿真结果验证了所提算法的可行性和有效性。

In this paper,a five-leg topology structure of the unified power quality conditioner(UPQC)is proposed to realize comprehensive compensation of power quality disturbances in fault-tolerant mode.The series converter and parallel converter are modeled uniformly,and a control strategy of five-leg UPQC based on finite control set model predictive control(FCS-MPC)is proposed.Compared with traditional linear control strategy,the proposed algorithm constructs a unified prediction model and integrates the optimized cost function to realize the cooperative control of series and parallel converters.In addition,the compensation accuracy,transient performance and response speed of the converters on both sides are improved.The complexity of the control algorithm and the difficulty of parameter adjustment are effectively reduced with high parameter robustness.Simulation results verify the feasibility and effectiveness of the proposed algorithm.