摘要
针对基于电压源型变流器(voltage source converter,VSC)的多端直流输电(multi-terminal HVDC transmission,MTDC)系统的电磁暂态仿真中,每一个VSC均包含多个电力电子器件,同时采用脉宽调制技术,势必增加VSC-MTDC仿真系统的数学计算量的问题,提出了一种VSC平均值模型替代VSC详细模型,以简化仿真系统。基于VSC平均值模型的简化方法,即:忽略变流器输出电压中的所有高次谐波,以受控电压源替代变流器输出,以虚拟受控电流源表征交/直流接口关系。最后,通过搭建三端VSC-MTDC输电仿真系统,对比了所提出的平均值模型与详细模型在各个工况下的系统响应,仿真结果表明,VSC平均值模型与详细模型在不同工况下,两者的系统动态响应基本一致,采用平均值模型系统仿真速度更快,仿真效率更高。
Aiming at the problem that the mathematical calculation of the VSC-MTDC simulation system is greatly increased by the number of power electronic component switches and pulse width modulation technology of VSC in the electromagnetic transient simulation,an average-value model of VSC was proposed to replace the detailed model of VSC in order to simplify the simulation system. The simplified method based on the VSC average-value model,and the high-order harmonic of the output voltage of the converter is neglected. The output of the converter was replaced by the controlled voltage source,and the AC/DC interface relationship was expressed virtual controlled current source. At last,a 3-terminal VSC-MTDC transmission simulation system was built,and the system responses in different cases of detailed model were compared with the average-value model. The simulation results show that the system responses of the two kind of models are nearly the same,and the average-value model greatly speeds up the system simulation and improves the simulation efficiency.
出处
《电机与控制学报》
EI
CSCD
北大核心
2018年第3期1-8,共8页
Electric Machines and Control
基金
国家自然科学基金(51377105)
上海市联盟计划项目(2015LM11)
关键词
电压源型变流器
多端直流输电
平均值模型
电磁暂态仿真
voltage source converter
multi-terminal HVDC
average-value model
electromagnetic transient simulation
