超导储能用电流调节器充放电数学模型及其控制系统

Charging and Discharging Math Model and Control System of Current Regulator for Superconducting Magnetic Energy Storage

电压型超导储能系统由电压源换流器和斩波器构成。电压源换流器负责与系统进行有功和无功的交换,而斩波器则用来实现对超导磁体的充放电,以满足系统有功功率的要求。中科院电工所提出了一个带隔离变压器的双向DC/DC形式的电流调节器,实现了斩波器的功能。本文用状态空间平均法建立了电流调节器的充放电小信号数学模型,并在此基础上分别设计了电流调节器的充放电控制器,其中充电控制器采用滞环+PI调节的方式。针对放电控制,设计了两种三环控制器,并对其进行了分析比较。实验结果证明了该控制器控制性能的有效性。

The voltage source type superconducting magnetic storage system （V-SMES） is composed by a voltage source converter （VSC） and a chopper. The VSC is used to exchange the active and reactive power with the utility and the chopper is used to charge and discharge the superconducting magnet and provide the active power for the utility. A hi-directional DC/DC type current regulator, which is used to play the role of chopper, has been proposed by the Institute of Electrical Engineering Chinese Academy of Science. In this paper, state-space averaging method is used to establish the small signal model of current regulator. Based on these models, charging and discharging controllers for current regulator is proposed. Hysteresis plus PI control method is used in the charging controller, and two kinds of three-loop discharging controller are proposed and compared in this paper. Experimental results demonstrate the good performance of these controllers.