与传统中频电源相比,模块化中频静变电源具有选用灵活、可靠性高、冗余性好、便于系统维护等优点。中频静变电源整流器在控制母线电压稳定的同时还要实现单位功率因数控制。为此,具体分析了双电流环控制策略,给出了双电流环控制器中电压电流正负序分离原理和双dq锁相环的具体实现方法,即延时信号抵消(DSC)和双闭环准比例谐振(PR)。针对逆变器输出电压基波无差跟踪困难、谐波含量高等问题,采用双闭环多重准PR控制策略,实现中频电压的稳定输出。仿真和试验结果表明,双电流环控制器能同时实现母线电压稳定和单位功率因数控制,采用双闭环多重准PR控制策略的中频逆变器能够输出稳定的中频交流电压。

Compared with traditional medium frequency power supply, modular medium frequency static power supply had the advantages of flexible selection, high reliability, good redundancy and easy system maintenance. The rectifier of medium frequency static power supply should achieve unit power factor control while controlling bus voltage stability. For this reason, the dual current loop control strategy was analyzed concretely. The principle of separating positive and negative sequences of voltage and current in dual current loop controller and the concrete realization method of double dqphase locked loop were introduced, i.e., delay signal cancellation (DSC) and quasi proportional resonance (PR). Aiming at the problems of high harmonic content and difficulty in tracking the fundamental wave of the output voltage of the inverter, a multiple quasi PR control strategy was adopted to achieve the stable output of the medium frequency voltage. The simulation and experimental results showed that the dual current loop controller could achieve bus voltage stability and unit power factor control simultaneously. The medium frequency inverter with double closed loop multiple quasi PR control strategy could output stable medium frequency AC voltage.

TM 46

国家自然科学基金项目(51807199,51977218)