一种基于SPWM的交-直-交型变频器系统简化模型

Simplified Model for AC-DC-AC Converter System Based on SPWM

针对应用Matlab/Simulink/PSB对交-直-交变频器建模仿真存在运算量大,耗时长的问题,提出了一种适合于控制系统分析设计的简化高效的基于SPWM变频器系统模型。首先详细推导了基于通用模块的变频器开关函数模型;然后提出一种代替SPWM脉宽调制环节的等效方法,组成了变频器系统的简化模型,并分析了基于简化模型设计控制系统的有效性;最后通过仿真进行验证。结果表明简化模型保持了原模型的外部特性而实际用时显著缩短,适合于控制技术研究的仿真应用。

As AC-DC-AC converter model built by Matlab/Simulink/PSB library blocks needs lots of time for calculation during simulating, a simplified and efficient AC-DC-AC converter model using SPWM with general blocks was proposed for control system design. The converter model based on switching function was obtained, and an equal method substituted for SPWM was proposed. As the result, the total simplified model was established. The correctness of control system design using this simplified model was analyzed and verified by simulations. Results show that the simplified model possesses the same outside characteristics with the original one while the simulating time is reduced remarkable, which is especially suit for control technology research .