级联型换流器在超导储能系统中的应用

超导储能用大功率换流器的选择直接影响了超导储能系统的工作性能。比较了近年来常用的大功率换流电路的特点,阐述了采用级联型电路作为超导储能用大功率换流器的思路,并给出了级联型模块化的超导储能电路拓扑结构。提出了超导储能装置低延迟电压补偿算法及谐波提取算法,并进行了原理仿真,结果表明超导储能系统采用级联型换流器能够有效地进行有源滤波和电压补偿工作,使电压暂降得到快速补偿,并基本上消除了系统谐波。

Application of Cascaded Converter in Superconducting Magnetic Energy Storage System

The selection of large-scale converters for superconductive magnetic energy storage(SMES)directly influences the working properties of SMES system.The authors compare the features of large-scale converters commonly used in recent years,expound the thinking of adopting cascade converter as large-scale converters for superconductive magnetic energy storage,and present the topological structure of modularized SMES prototype based on cascade converter.Low delay control algorithm including voltage sag compensation for SMES devices and harmonics extraction algorithm is put forward and corresponding simulation of the proposed principle is performed.Simulation results show that by use of cascade converter in SMES system the active filtering and voltage compensation can be effectively implemented,the voltage sag can be quickly compensated and harmonics in SMES system can be basically eliminated.