基于伪滑模控制的模块化超导储能系统电网电压补偿算法

Pseudo-Sliding Mode Based on Power Grid Voltage Compensating Algorithm for Modularized Superconductive Magnetic Energy Storage System

提出了一种基于伪滑模控制的模块化超导储能系统电网电压补偿算法。该算法以滑动模态为核心,采用具有滞环的变结构控制有效降低了标准滑模控制的抖动问题,使换流器能够快速补偿负载端电压凹陷并滤除电网谐波,保证电压敏感负荷在电压受到干扰的情况下正常工作。基于级联型换流器数学模型,分析了伪滑模变结构控制的工作特性及其与电路参数之间的关系。仿真结果表明,采用滞环伪滑模控制的超导储能系统能够在系统干扰较大的情况下保持控制的稳定性,迅速跟踪指令信号,动态响应时间在1ms之内,具有良好的鲁棒性与实时性。

A pseudo-sliding mode based on power grid voltage compensating algorithm for modularized superconductive magnetic energy storage system is proposed. The sliding mode is the kernel of the proposed algorithm and a variable structure control method with hysteresis loop is utilized, so the trembling phenomenon in standard sliding mode control can be effectively restrained; thus the converter can rapidly compensate the voltage sag at demand side and filtrate harmonics in power gird, and the normal operation of voltage-sensitive loads can be ensured under voltage interference. Based on the mathematical model of cascaded converter, the running characteristic of pseudo-sliding variable structure control and the relation between this running characteristic and circuit parameters are analyzed. Simulation results show that the SMES, which adopts pseudo-sliding mode control with hysteresis loop, can stabilize load voltage under strong disturbance of power grid, rapidly trace the reference signal, and its dynamic response time is less than lms, so the proposed algorithm possesses good robust and real-time performance.