三端口柔性多状态开关有限集模型预测控制

A Finite Control Set Model Predictive Control for Three-port

柔性多状态开关(SOP)作为一种新型电力电子装置,可提升配电网运行的灵活性与稳定性。SOP通常采用双闭环控制策略,对于三端口SOP而言共需12个PI调节器,控制结构复杂。因此,本文提出一种基于有限集模型预测控制(FCS-MPC)的三端口SOP的内环电流控制方案。该方案无需PI调节器整定且控制灵活,易于实现。建立了三端口SOP的数学模型,分析其工作原理;接着分析了FCS-MPC和双闭环控制的工作原理;在稳态运行条件和动态运行条件下,用Matlab/Simulink对基于FCS-MPC的SOP的运行情况进行仿真,对比分析了双闭环控制和FCS-MPC时的负载电流响应速度。结果表明:FCS-MPC在电流波动时具有更快响应速度,在稳态时具有更好的稳定性和抗干扰性,验证了所提方案的优越性及有效性。

Soft open point(SOP),as a new type of power electronic device,can improve both flexibility and stability of operation of power distribution network.The double closed-loop control strategy is adopted for the SOP.For the three-port SOP,12 pieces of proportional-integral(PI)regulators are needed and the control structure is complicated.Therefore,a kind of an inner loop current control scheme based on a finite control set model predictive control(FCS-MPC)is proposed for the three-port SOP.The scheme does not need PI regulator setting,the control is flexible and is easy to achieve.A mathematical model of the three-port SOP is set up and its working principle is analyzed.Then,the principle of double closed-loop and FCS-MPC control strategy is analyzed.SOP operation based on FCS-MPC is simulated under both steady-state and dynamic conditions,and the load current response speed of the double closed-loop control and FCS-MPC are compared using Matlab/Simulink.The results show that the FCS-MPC possesses faster response speed in the current fluctuation,better stability and anti-interference in the steady condition,and both superiority and effectiveness of the proposed scheme are verified.