变流器机电暂态仿真通用化模型的研究

Study on Converter Electromechanical Transient Simulation Universal Model

新能源接入电网需要变流器,为了适应变流器建模和控制策略多样化的特点,建立了一种通用化变流器机电暂态仿真模型。将常用变流器的建模和控制策略进行分析总结,建立了模块化的变流器模型,该模型将控制电路和主电路封装到一个模块里。与传统电磁暂态仿真中模型的区别是,以有效值、向量作为输入输出以及中间变量,面向机电暂态过程或更长时间过程,不涉及具体的物理器件、脉冲信号以及变量的瞬时值。所建电力电子变流器模型具有很强的通用性,可以适应不同类型新能源发电系统的并网。最后,在仿真软件PSCAD/EMTDC和Matlab中对光伏发电系统模型进行了适应性验证,在Matlab中编程实现的机电暂态模型和在PSCAD/EMTDC中实现的电磁暂态模型的仿真结果相同,证明了通用化建模方法的正确性。

New energy requires converters to connect with the grid.An universal converter model for the electromechanical transient simulation is proposed in order to adapt to the diversification of modeling structure and control method.The common-used modeling and control methods are analyzed and summanzed,and a modular converter model is set up which makes the control circuit and the main circuit encapsulated in a module.The difference with the model for traditional electromagnetic transient simulation is that the universal model chooses the RMS and the phaser as the input,output and intermediate variables.The universal model is designed for the electromechanical or more transient process and does not involve specific devices,pulse signals and the instantaneous value of variables.The converter model in this paper is strongly universal,and can adapt to different types of new energy power generation system connecting with the grid.In the simulation software PSCAD/EMTDC and Madab,adaptive authentication is carried out for photovoltaic system,and the model＇s simulation results in Matlab and detailed model in PSCAD/EMTDC are exactly the same,which proves the accuracy of the universal model.