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电力大数据:2019,22(6):-
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基于数值计算模型的MMC半桥型子模块仿真方法
(1.贵州电网有限公司电力科学研究院;2.贵州大学电气工程学院)
A simulation method of half-bridge sub-module of MMC based on numerical calculation model
(1.Guizhou Electric Power Design and Research Institute Co,Ltd of China Power Construction Group;2.College of Electrical Engineering,Guizhou University)
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投稿时间:2018-07-30    修订日期:2018-09-06
中文摘要: 模块化多电平换流器(MMC)的各半桥子模块均由两个开关组(1个IGBT和1个反并联的二极管)构成。针对MMC在包含的子模块规模较大的情况下,对采用电路模型分割法对MMC进行分割后的子模块进行仿真求解时仍然会占用较多资源,效率不高的问题,提出了基于数值计算模型的MMC半桥子模块仿真验证方法。首先通过分析三相MMC及其半桥子模块(HBSM)的工作机制,把半桥型子模块中的两个开关组等效为在高、低阻态不断切换的等效电阻并给出了其等效电路。然后针对电容支路的离散化问题,根据梯形积分法推导了MMC半桥型子模块的数值求解公式,给出了数值计算电路模型。最后基于MATLAB仿真平台建立了基于数值计算模型的半桥子模块仿真验证模型,通过与详细模型子模块的仿真波形对比分析,结果表明了所建立的子模块数值计算模型是可行的。
Abstract:Each half-bridge sub-module of a modular multilevel converter (MMC) consists of two switch groups (1 IGBT and 1 anti-parallel diode).In the case of the large scale of the submodules included in the MMC, the simulation solution of the submodules divided by the circuit model segmentation method will still occupy more resources and the efficiency is not high. A simulation verification method of MMC submodule based on numerical model is proposed.Firstly, by analyzing the working principle of MMC and the working mechanism of HBSM, two switching groups in the half-bridge sub-module are equivalent to the constant switching resistance in high and low resistance states, and the equivalent circuit is given. Then,in order to discretize the capacitor branch,numerical solution formula of the half-bridge sub-module of MMC is deduced based on the trapezoidal rule and the numerical calculation circuit model is given. Finally, the simulation in the MATLAB which includes two types of sub-module model,the simulation waveforms of the two models are compared and analyzed. The simulation results prove that the numerical calculation model sub-module is feasible.
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