摘要
多馈入直流系统强非线性、强耦合特征使评估交直流系统之间相对强弱关系变得异常复杂。基于2008年CIGRE直流工作组提出的多馈入直流短路比(MISCR)定义,分析了MISCR构成元素及影响其大小的因素和内在机理,详细论证了直流落点间联络阻抗、系统等值阻抗、直流功率等元素之间相互关系对MISCR的影响及其变化特征,给出了临界条件和拐点解析解;并进一步研究了含有直流系统的两区域联网对MISCR的影响,推导得出联网前后SCR到MISCR的变化规律;最后,指出了MISCR后续改进研究应考虑的问题。所得结论可用于指导MISCR概念的应用,以及交直流电网规划和运行。
With the strongly nonlinear and coupled features in multi-infeed DC system, it is difficult to evaluate the AC/DC systems. Based on the M1SCR definition proposed by CIGRE working group in 2008, this paper analyzes the elements of MISCR and the factors and their mechanism. Then, the MISCR and its characteristics influenced by the relationship among the impedance and equivalent impedance of AC system and DC power are demonstrated in detail, and the analytical solutions of the critical condition and inflection point are given. Furthermore, the change rules between SCR and MISCR are deduced before and after network interconnection. Finally, this paper presents the existing limitations of MISCR definition and the problems should be considered. The study results in this paper can be used to guide the application of MISCR concept and AC/DC power grid planning and operation.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2012年第9期69-74,81,共7页
Power System Protection and Control
