多馈入直流系统广义短路比:定义与理论分析  

Generalized Short Circuit Ratio for Multi-infeed DC Systems: Definition and Theoretical Analysis

作　　者：辛焕海[1] 章枫 于洋[2] 甘德强[1] 徐谦[3] 

机构地区：[1]浙江大学电气工程学院,浙江省杭州市310027 [2]国网北京经济技术研究院,北京市昌平区102209 [3]国网浙江省电力公司经济技术研究院,浙江省杭州市310006

出　　处：《中国电机工程学报》2016年第3期633-647,共15页Proceedings of the CSEE

摘　　要：分析了静态电压稳定和多馈入系统短路比的联系,从特征根的角度探索了一种刻画交直流系统强度和稳定性的多馈入系统广义短路比(generalized short circuit ratio,GSCR)指标,克服了传统短路比概念在多馈入下物理机理不明确及对交流系统强度刻画不准确的缺陷,实现了短路比概念在单馈入和多馈入下物理意义及数学形式上的统一。GSCR是在较弱的假定条件下定义,因此具有一般性。理论证明GSCR唯一存在且不小于最小多馈入短路比,而传统短路比仅是GSCR在附加较强假设条件后的一个特例。仿真算例表明新定义下的GSCR能更准确地描述多馈入系统受端交流电网的强度。The relationship between the short circuit ratio（SCR） and static voltage stability is analyzed in this paper for multi-infeed DC systems（MIDC）. A new concept named generalized short circuit ratio（GSCR） has been proposed to exactly depict the strength and voltage stability of AC-DC systems according to the eigenvalue decomposition method, which can overcome the unclear physical mechanism of the traditional multi-infeed short circuit ratio（MISCR） and unify the concept of SCR in single and multi-infeed DC system physically and mathematically. The GSCR is general since it is defined under weaker assumptions. Furthermore, some properties on the GSCR are given, including the unique existence of the GSCR and that the GSCR is not less than the minimum MISCR, and it is shown that the MISCR is a special case of GSCR under the condition of strong additional assumptions. Numerical simulations illustrate that for a MIDC, the strength of the AC system can be described better by the defined GSCR than the MISCR.

关 键 词：多馈入直流系统 多馈入短路比 广义短路比 交流电网强度 

分 类 号：TM723[电气工程—电力系统及自动化]