摘要
树状直流系统极间故障特性复杂,多换流站同时作用下,高阶电流电压暂态解析式会导致计算难度显著增大。通过分析各端参数一致时端数变化,以及端数固定时参数变化对直流系统故障特性的影响,基于单端直流故障计算分析,提出计及不同端口之间相互影响的树状直流系统故障计算修正方法,减小复杂直流电网故障计算量。利用MATLAB/Simulink仿真工具搭建树状直流系统模型对计算结果进行验证,修正后电压、电流计算值与暂态仿真结果基本吻合,为故障定位和整定值的计算提供了理论依据。
The characteristics of the pole-to-pole fault in the tree DC system are complicated, and the transient analyt- ic expressions of high-order current and voltage can make the difficulty of calculation increase＂ significantly. In re- sponse to this phenomenon, on the one hand, when the parameters are the same, the impact of the changes of the number about the terminals on the waveform is considered. On the other hand, when the number of terminals is fixed, the influence of the change of the parameter on the waveform is studied. Based on the analysis of single-ended DC fault, the fault calculation modification method of tree DC system taking into account the interaction between different ports is proposed. This method can reduce the computational complexity of complex DC power network. The calcula- tion results are verified by MATLAB/S^mulink simulation tool. The calculated voltage and current values after modifi- cation are in good agreement with the results of transient simulation, which provide the theoretical basis for the fault location and calculation of setting value.
出处
《电测与仪表》
北大核心
2018年第1期21-26,52,共7页
Electrical Measurement & Instrumentation
基金
国家重点研发计划(2016YFB0900203)
关键词
树状直流系统
极间短路故障
端数变化
参数变化
tree DC systems, pole-to-pole short circuit fault, number of terminals changes, parameter changes
