摘要
常规直流和柔性直流并联构成的混合直流输电系统,可发挥常规直流大功率输电和柔性直流有功/无功快速解耦控制的优势,尤其针对落点极弱交流系统有较好的经济技术性能。结合云南电网与南网主网背靠背异步联网工程实例,分析了混合直流中柔直单元对于系统稳态运行和故障恢复特性的改善作用及效果,并进一步提出了柔直单元的功率优化控制策略。仿真分析结果表明,柔直单元对于合理配置无功小组、提高弱系统强度、改善故障后常规直流恢复特性效果明显,验证了功率优化控制策略的有效性。
The hybrid HVDC system consists of HVDC and VSC-HVDC, which could comprehensively utilize theadvantages of the high power transmission capability in HVDC and the active/reactive power decoupling control in VSC-HVDC, especially for the situation of HVDC link weak AC system. Based on the asynchronous interconnection project ofYunnan and CSG power grid, this paper analyzes the improving effect of VSC-HVDC module during hybrid HVDC sys-tem under the steady operation and fault recovery conditions. Furthermore, this paper proposes a power control optimiza-tion strategy of VSC-HVDC module. The simulation result indicates that the VSC-HVDC module has significant effectfor optimizing reactive group configuration, improving system strength of weak AC system, and enhancing recovery char-acteristics of HVDC. Finally, it verifies the validity of VSC-HVDC power control optimization strategy.
出处
《水电能源科学》
北大核心
2014年第12期173-177,共5页
Water Resources and Power
