特高压直流分层接入方式下层间交互影响研究

为研究特高压直流分层接入方式对电力系统带来的影响,分析了直流分层接入方式下层间交互影响因子的计算方法,对比不同计算方法之间的差异,分析其产生的原因。通过与传统接入方式的对比,研究了直流分层接入方式对层间交互影响、有效短路比以及暂态过电压的影响。结果表明直流分层接入方式下层间交互影响更小,各层有效短路比更大,暂态过电压更小。相比传统接入方式,直流分层接入方式更优。

Study on Hierarchical Interaction of UHVDC Hierarchical Connection Mode

To study the impact of ultra high-voltage direct current (UHVDC) hierarchical connection mode on power system,the calculation methods of hierarchical interaction factor (HIF) are proposed and the causes of the deviation between different methods are analyzed.The impacts of UHVDC hierarchical connection mode on HIF,effective short circuit ratio (ESCR) and transient over-voltage (TOV) are investigated compared with the traditional connection mode.The results indicate that the HIF is smaller,the ESCR is larger and the TOV is smaller under the hierarchical connection mode.The hierarchical connection mode is more superior with the traditional one.