摘要
混合双馈入直流输电系统中电网换相换流器高压直流输电(line commutated converter based high voltage directcurrent,LCC-HVDC)子系统对电压源换流器高压直流输电(voltage source converter based high voltage direct current,VSC-HVDC)子系统运行特性的影响机理有待深入研究。首先建立了基于不同LCC-HVDC子系统控制模式的混合双馈入直流输电系统数学模型,并分析归纳了VSC-HVDC子系统的安全稳定运行约束条件和判据,提出了一种确定混合双馈入直流系统中VSC-HVDC子系统稳态运行区域的计算方法。在此基础上对比分析了VSC-HVDC子系统稳态运行区域与LCC-HVDC子系统控制模式、交流系统短路比、LCC-HVDC与VSC-HVDC容量配比之间的关系。最后,基于PSCAD/EMTDC软件搭建了混合双馈入直流系统仿真模型,仿真验证了VSC-HVDC子系统稳态运行区域计算方法的有效性。
The influence mechanism of line commutated converter based high voltage direct current （LCC-HVDC） sub-system to the operation characteristic of voltage source converter based high voltage direct current （VSC-HVDC） sub-system in hybrid dual-infeed HVDC system needs further study. Firstly, the mathematical models of hybrid dual-infeed HVDC system with different LCC-HVDC control modes were derived in this paper. Based on these models, the security and stability constraints of the VSC-HVDC sub-system in hybrid dual-infeed HVDC system were analyzed and summarized. Then, an approach to determine the stable operating area of the VSC-HVDC sub-system in hybrid dual-infeed HVDC system was presented. Based on this method, the impact of the different control mode of LCC-HVDC sub-system, the short circuit ratio （SCR） of AC system and the capacity rate between LCC-HVDC and VSC-HVDC on the stable operating area of VSC-HVDC sub-system were studied. Lastly, the validity of the proposed approach was proved by hybrid dual-infeed HVDC simulation model built in PSCAD/EMTDC.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2017年第13期3764-3774,共11页
Proceedings of the CSEE
基金
国家自然科学基金项目(51507060)
中央高校基本科研业务专项资金资助项目(2016MS07)~~
关键词
混合双馈入直流系统
电压源换流器型高压直流输
电系统:安全稳定约束条件
稳态运行区域
Hybrid dual-infeed high voltage direct currentsystem
voltage source converter based high voltage directcurrent
security and stability constraints
stable operating area
