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模块化多电平换流器子模块宽频建模及其瞬态特性研究

发布时间:2019-01-12 11:07  文章来源:笔耕文化传播
【摘要】:柔性直流输电是坚强智能电网的核心装备,与传统直流输电相比,柔性直流输电在孤岛供电、城市配电网的增容改造、交流系统互联、大规模风电场并网等方面具有明显技术优势,是我国大电网发展格局的战略选择。目前最受关注的柔性直流输电拓扑为模块化多电平换流器(Modular Multilevel Converter,MMC),该拓扑换流阀中的核心设备是MMC子模块。因此,针对MMC子模块的宽频建模和瞬态分析有着重要意义。本文针对工程用MMC子模块,首先搭建了子模块的瞬态特性测试平台,该平台可对MMC子模块进行不同电压电流和开关时间下的动态特性测试,从而得到了多种工况下的动态特性曲线。然后针对子模块内部的各种元器件,分别搭建了详细的电路仿真模型。包括高压IGBT器件的解析模型,快速续流二极管的行为模型和旁路晶闸管的截止状态模型。同时针对测试回路整体和局部的杂散电感进行了提取。最后,通过对两种不同电压功率等级的IGBT模块的试验和仿真,验证了模型和参数提取的正确性,并且针对有无旁路晶闸管时的子模块瞬态特性进行了测试仿真,并从机理上解释了晶闸管如何影响开关过程,以及其对子模块总体损耗的影响。本文提取了MMC子模块的核心器件参数及回路杂散参数,建立了子模块的宽频模型,对于后续子模块不同工况损耗计算,子模块的优化设计和子模块电磁骚扰分析有着巨大帮助。
[Abstract]:Flexible direct current transmission is the core equipment of strong smart grid. Compared with traditional direct current transmission, flexible direct current transmission supplies power in isolated islands, increases the capacity of urban distribution network, and interconnects the AC system. The large scale wind farm has obvious technical advantages and is the strategic choice of the development pattern of large power grid in China. At present, the most concerned flexible DC transmission topology is modularized multilevel converter (Modular Multilevel Converter,MMC). The core device in this topology converter valve is the MMC submodule. Therefore, broadband modeling and transient analysis for MMC submodules are of great significance. In this paper, the transient characteristic test platform of the submodule is built for the engineering MMC submodule. The platform can test the dynamic characteristics of the MMC submodule under different voltage, current and switching time. The dynamic characteristic curves under various working conditions are obtained. Then the detailed circuit simulation model is built for various components in the sub-module. It includes the analytical model of high voltage IGBT device, the behavior model of fast recurrent diode and the cutoff state model of bypass thyristor. At the same time, the whole and local stray inductors of the test circuit are extracted. Finally, two kinds of IGBT modules with different voltage power levels are tested and simulated to verify the correctness of the model and parameter extraction, and the transient characteristics of sub-modules with or without bypass thyristors are tested and simulated. It also explains how the thyristor affects the switching process and how it affects the overall loss of the sub-module. In this paper, the core device parameters and the stray loop parameters of the MMC submodule are extracted, and the broadband model of the sub-module is established, which is of great help to the calculation of the loss under different working conditions, the optimization design of the sub-module and the analysis of the electromagnetic disturbance of the sub-module.
【学位授予单位】:华北电力大学(北京)
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:TM721.1;TM46

【参考文献】

相关期刊论文 前10条

1 李岩;罗雨;许树楷;周月宾;袁志昌;;柔性直流输电技术:应用、进步与期望[J];南方电网技术;2015年01期

2 马为民;吴方R,

本文编号:2407705


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