正弦波逆变电源的自适应模糊控制策略及实现

逆变电源系统结构特殊且具有较强的非线性和参数时变性,尤其在非线性负载下采用常规控制难以获得理想的控制效果.本文将一种自适应模糊控制方法应用到单相正弦波逆变电源的控制当中,提出通过设计辅助模糊控制器对比例因子进行在线调整来改善常规模糊控制器的自适应能力和鲁棒性,使逆变电源控制器在兼顾系统动态响应性能的基础上,提高了不同负载特性下系统的输出波形质量.3kW样机的实验结果表明这种参数自调整的自适应模糊控制能使逆变电源在非线性负载下具有较好的动、静态特性.

A control scheme of SPWM inverters based on self-adaptive fuzzy control

As the sine wave inverter is highly nonlinear and has variable parameters due to its special structure of complicated multi-stage power converter, the perfect control can not be obtained with conventional control methods especially under nonlinear rectifier loads. A Self-adaptive Fuzzy control in this paper is applied to single-phase SPWM inverter. Assistant Fuzzy controller is designed to improve the self-adaptive and robust property through adjusting the scaling factor of main fuzzy controller on-line. The structure and parameters of main circuit are provided in the paper. Design processes of main fuzzy controller and assistant fuzzy controller are also given in detail. By this design the inverter can not only stabilize the output sine waveforms but also realize rapid transient response under variable loads. Experiment result of 3kW prototype verifies the Self-adaptive Fuzzy controller of scaling factor self-adjusting.