高频开关电源模糊内模PID控制器设计

The design of fuzzy internal model PID controller in high-frequency switching power supply

针对移相全桥开关电源系统的主电路结构及传统PID控制器参数调节复杂的问题,首先应用状态空间平均法建立了全桥型变换器的动态小信号数学模型,模型仿真验证了数学模型的准确性;在此基础上,根据内模控制器的设计原则,设计了内模-PID控制器,以减少可调参数的数量,降低参数调节的复杂性,并引入模糊算法,构成模糊内模-PID控制器,从而兼顾控制器的动态性能和鲁棒性能。最终仿真,证明了所设计控制器的有效性。

In view of the main circuit structure of the phase-shifted full-bridge switching power supply system and the complexity of traditional PID controller parameter adjustment, the full-bridge switching power dynamic small-signal mathematical model was established by using the state-space averaging method firstly, and the accuracy of which was verified by simulation. And then, on the basis of the internal model design principle, an internal model PID controller was designed to reduce the number of adjustable parameters and the complexity of parameters adjustment. By introdu- cing the fuzzy algorithms, a fuzzy internal model-PID controller was designed to take into account the dynamic per- formance and robust performance. Finally, simulation proves the effectiveness of the designed controller.