基于模糊滞环空间矢量的变换器控制策略

采用滞环空间矢量控制的三相电压型变换器电压外环调节主要依赖于传统比例积分(PI)调节器,所以当系统状态或者自身参数变化时,将难以使系统获得满意的动态性能。针对该问题,在电压外环引入模糊PI调节器,根据工程经验在线调整P、I参数,以应对系统变化。同时给出电流内环滞环空间矢量控制中开关状态的选择原则。仿真和实验结果表明,所提控制策略能够有效保证系统稳态性。此外,与采用传统PI调节器的滞环空间矢量控制策略的对比结果表明,所提控制策略可以将变换器的暂态响应时间减少55%以上,使系统获得更为出色的暂态性能。

Fuzzy hysteresis space vector based control scheme for converters

It is difficult for the classical proportional-integral (PI) regulator employed in the outer voltage loop to satisfy the system performance requirement, when the system states or its parameters are changed in the three-phase voltage source converter using the hysteresis space vector control. The fuzzy based PI regulator is therefore introduced. The coefficients of P and I are adjusted online based on the engineering experience to deal with the system change. A hysteresis space vector control is adopted in the inner current loop. Its principle for selecting the switching states is provided. Finally, the simulation and experiment results show that, the proposed control method can guarantee the system stability effectively. Moreover, compared with the hysteresis space vector control with the classical PI regulator, the proposed control method can reduce the transient setting time more than 55% and ensure the better transient performance.