一种VVVF电源的模糊PID控制

A Fuzzy PID Controller of VVVF Source

变压变频电源由于开关的非线性和对电路参数的依赖性,即使采用多种优化方式,也仍然难以提高其动态性能,因此限制了其在更宽负载范围内的运用。在此,依据模糊控制理论,用一个模糊PID开关切换控制,对现有的控制系统进行了改进。仿真结果表明,该方法在没有提高电路复杂度和主开关工作频率的情况下,提高了系统动态性能,拓宽了负载工作范围。

It is difficult to further improve the dynamic performance of multi-stage sources including variable voltage and variable frequency converter （VVVF）, because of theirs nonlinear switch and dependence on circuit parameters. In this paper a fuzzy proportional-integral-differential （PID） switch cutover control scheme is built up and its operation principle is also illustrated. Recently, some study focus on multi-stage sources including DC/DC, AC/AC and DC/AC converters, but here a fuzzy control scheme in two-stage source of AC/DC and DC/DC is presented. Then its simulation results are described and analysed. Without more complex topology structure and higher operation frequency of main switches, satisfying effect in improving the system dynamic performance and power factor （PF） is obtained.