摘要
为了准确评估混合多馈入直流系统中电压源换流器型高压直流(voltage source converter based high voltage direct current,VSC-HVDC)的受端系统强度,对VSC-HVDC的有效短路比进行研究。第一,建立了含有VSC和LCC的混合双馈入直流输电系统的小信号模型,基于该模型提出了LCC的运行阻抗的基本概念和计算方法;第二,结合LCC的运行阻抗,提出了混合多馈入直流输电系统中VSCHVDC有效短路比的计算方法,并分析了计及LCC-HVDC影响时VSC-HVDC的功率运行极限;第三,利用建立的小信号模型,研究了VSC控制器参数对其功率运行极限的影响。通过基于PSCAD/EMTDC的仿真分析,验证了相关结论的正确性。
Effective short circuit ratio （ESCR） of voltage source converter based high voltage direct current （VSC-HVDC） in hybrid dual-infeed HVDC system is investigated to evaluate VSC-HVDC system strength. Firstly, small signal model for dual-infeed HVDC system including LCC-HVDC and VSC-HVDC is developed. The model enables LCC operational impedance to be calculated theoretically. Secondly, based on LCC operational impedance, VSC-HVDC ESCR in hybrid multi-infeed HVDC system is calculated. Then taking LCC-HVDC impact into consideration, theoretical maximum available power of VSC is investigated. Thirdly, impact of controller parameters on VSC power limit is analyzed using the developed small signal model. Conclusions are validated by comparison with PSCAD/EMTDC results.
出处
《电网技术》
EI
CSCD
北大核心
2017年第8期2436-2442,共7页
Power System Technology
基金
国家自然科学基金资助项目(51507060)
先进输电技术国家重点实验室开发基金项目~~
关键词
混合多馈入直流输电系统
运行阻抗
有效短路比
控制参数
功率极限
multi-infeed HVDC system
operational impedance
effective short circuit ratio
control parameters
maximum power limit
