三相升-降压PWM整流器Fuzzy-PI控制算法

针对直流电机控制等应用领域对大范围连续平滑可调直流电压的需求,分析了现有升-降压整流系统的不足,基于三相电压型升-降压PWM整流器的工作原理,按照有效降低开关损耗、控制简单、易于工程实现等原则,用拓展零矢量对传统SVPWM控制策略进行改进,建立了相应的数学模型,进行了相应的数学分析,设计了自适应模糊控制和PI控制相结合的双模控制方案,并通过Matlab7.11环境下的离散化模型仿真,将新控制算法与已有控制算法比较,证明了新控制算法的良好效果。

Fuzzy-PI Control Algorithm for Three-Phase Step-Up/Down PWM Rectifier

The disadvantages existing in the commonly used three-phase step-up/down PWM rectifier are analyzed in connection with the need of continuously adjustable DC voltage in a wide range such as the control of DC motor.Based on the working principle of the three-phase step-up/down PWM rectifier and according to the principle of low switching frequency,simple control and easy engineering implementation,a new control strategy on the basis of SVPWM is designed with the expansion of zero-vector for the rectifier.Meanwhile,the corresponding mathematical model and reasoning is also presented.Then a fuzzy-PI controller is designed with proportional-integral separation.Finally,the simulation results and analysis of novel algorithm and traditional control algorithm are also presented to verify the validity of theoretical results and control algorithm by Matlab7.11.