【摘要】 滞环电流控制广泛应用于微电网系统并网逆变器中,这种控制方式存在的主要问题是开关频率不固定、电流谐波较大。针对该问题提出了一种变论域模糊滞环宽度控制方法。通过研究开关频率与滞环宽度之间的关系,首先引入伸缩因子,然后设计变论域模糊控制器,最后实现动态调节滞环比较器的宽度,从而达到稳定开关频率的目的。通过实验,有效验证了该控制策略具有良好的动态、稳态性能,从而提高了并网效率。更多还原

【Abstract】 Hysteresis current control is a control mode of current tracking control which is widely used in microgrid grid-connected inverter.The main shortcomings are inconstant in switching frequency and big harmonics of the current.A proposal of a variable universe fuzzy hysteresis bandwidth control approach is made for the problem in which made the width of the hysteresis dynamically regulating. Firstly, the contraction-expansion factor is introduced. Then the variable universe fuzzy controller is designed.thus stabilizing the switching frequency by investigating the relationship between switching frequency and hysteresis bandwidth.Through the experiment,it is proved that the control strategy has good dynamic and steady state performance, thus the grid efficiency is improved.更多还原