交直流混联电网LCC-HVDC换流器建模方法综述
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摘要
交直流电网混联,大规模电力跨区输送成为我国电力系统的主要特点。电网换相换流器型直流输电(line commutated converter high voltage direct current,LCC-HVDC)是我国交直流混联电网的主要组成部分,为实现交直流混联电网快速、准确仿真,该文对现有的LCC-HVDC换流器建模方法进行了分析与总结,对其优缺点进行评述,并根据作者观点,提出可进一步研究的内容:在仿真规模较大的交直流混联电网时,可用开关函数对LCC-HVDC进行建模,但模型准确度需要提升;多条LCC-HVDC输电线路的仿真可使用换流器级别模型与换流阀级别模型进行组合仿真;不同精细程度模型之间的数据接口要进行优化设计。
The hybrid of AC and DC power grid and large-scale power transmission across regions have become main characteristics of power grid in China. As LCC-HVDC transmission lines are main structure of AC/DC hybrid power grid in China, to realize the fast and accurate simulation of AC/DC hybrid power grid, this paper analyzed and summarized existing modeling methods of LCC-HVDC converter. Advantages and disadvantages of these models were investigated, and suggestions for further research were proposed from the authors' point of view: In the simulation of a large-scale AC/DC hybrid power grid, the LCC-HVDC can be modeled by switching function methods, but accuracy of the model needs to be improved; Simulation of multiple LCC-HVDC transmission lines can combine converter-level models with valve-level models; The data interfaces between different models should be optimized.
The hybrid of AC and DC power grid and large-scale power transmission across regions have become main characteristics of power grid in China. As LCC-HVDC transmission lines are main structure of AC/DC hybrid power grid in China, to realize the fast and accurate simulation of AC/DC hybrid power grid, this paper analyzed and summarized existing modeling methods of LCC-HVDC converter. Advantages and disadvantages of these models were investigated, and suggestions for further research were proposed from the authors' point of view: In the simulation of a large-scale AC/DC hybrid power grid, the LCC-HVDC can be modeled by switching function methods, but accuracy of the model needs to be improved; Simulation of multiple LCC-HVDC transmission lines can combine converter-level models with valve-level models; The data interfaces between different models should be optimized.
引文
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