一种基于动态相量法的交—直—交变频器系统简化模型

摘要

In order to solve the time consuming problem when Matlab/Simulink and Power System Blocksets is applied for the simulation and modelling of AC-DC-AC inverter.Firstly, a dynamic phasor model of AC-DC-AC converter based on the switching function is established.On this basis, the sinusoidal pulse width modulation (SPWM)is replaced to realize the simplification of the inverter model by taking into account the fundamental frequency component of switching function.Finally, the theory of model simplification is presented and the proposed model is verified by a simulation.The results show that the simplified model not only improves the dynamic characteristics of AC-DC-AC converter system, but also significantly reduces the simulating time.It is especially suitable for the system simulation of double-fed wind power and hydroelectric generating units.%为解决Matlab/Simulink和Power System Blocksets对交—直—交变频器建模仿真耗时长的问题, 运用动态相量法对交-直-交型变频器进行建模仿真分析.首先建立基于开关函数的交—直—交变频器动态相量法模型, 在此基础上, 只考虑开关函数的基频分量, 巧妙地替代正弦脉宽调制环节, 实现了变频器模型的简化.最后, 阐述模型简化的理论依据, 并通过仿真进行验证模型特性.结果表明:简化模型不仅保留了变频器系统的动态特性而且可以显著地缩短仿真耗时, 尤其适合于对双馈风力、水力发电机组进行系统级仿真研究等应用场合.