TSMC-S/G系统起动时的安全换流策略研究

Research on Safe Commutation Strategy in TSMC-S / G System at Starting

将双级矩阵变换器(TSMC)应用于起动/发电系统以提高系统的运行可靠性。系统起动时采用id=0的矢量控制策略,TSMC单向开关侧工作于不可控整流状态。针对系统起动工作时若电机功率因数角大于30°引起的换流问题,分析了一个扇区中不同开关状态下的电流流通路径,提出了一种可行的安全换流调制策略。该调制策略选择合适的作用矢量,并合理分配作用时间,可确保系统中电流始终存在流通回路。整个系统采用电流闭环实现恒转矩起动。仿真结果和实验结果均验证了系统起动安全换流策略的可行性与有效性。

The two stage matrix converter( TSMC) is used in the starter / generator system to improve the reliability of the system. The id= 0 space vector control strategy is used at starting,and the unidirectional switch side of the TSMC is worked in the no controlled rectifier state. To solve the commutation problem caused by over30° motor's power factor angle,the current circulating paths with different switch states in a sector are analyzed. Then a feasible safe commutation modulation strategy is proposed,which selects appropriate vectors and allocates times reasonably,and thus ensures the existence of the current circulation loop in the system. In addition,the system uses the current closed-loop control to realize constant torque starting. The feasibility and effectiveness of the start strategy for safe commutation is validated by simulation and experimental results.