基于共直流电压母线级联型超导储能系统的动态电压恢复器最小能量控制

构造了基于共直流电压母线级联型超导储能系统的动态电压恢复器，根据该装置直流母线电压可控的特点，提出了基于直流母线电压控制的最小能量控制方案。该方案通过控制直流母线电压的幅值，实现了有功功率从电网经十二脉波二极管整流器到直流电压母线的可控传输，减少了对斩波器输出有功功率的需求，降低了超导磁体的储能量，延长了电压暂降的补偿时间。同时，文中还对控制系统进行了整体设计，实现了动态电压的补偿和最小能量控制。仿真结果证明了所提控制策略的可行性。

Minimum Energy Control of Dynamic Voltage Restorer Based on Common DC Voltage Link Cascaded Superconducting Magnetic Energy Storage System

In this paper, a dynamic voltage restorer based on common DC voltage link cascaded superconducting magnetic energy storage system is constructed for the first time. Due to the feature that the DC link voltage of voltage type superconducting magnetic energy storage system is controllable, a minimum energy control scheme based on DC link voltage control is proposed. By means of controlling the amplitude of DC link voltage, the proposed scheme realizes the active power transmission from power network via 12-pulse diode rectifier to the dc link, thus the active power demand for the chopper provided by superconducting coil is reduced, By this way, the stored energy in superconducting magnet is reduced and the compensation time for voltage sag is protracted. Meanwhile, an integrated design of control system is carried out, so the minimum energy control and the compensation of voltage sag are implemented. Simulation results show that the proposed control strategy is feasible.