基于故障模型的环状直流系统暂态量计算方法<sub>*</sub>

徐岩; 刘婧妍; 付媛; 王毅

徐岩,刘婧妍,付媛,王毅.基于故障模型的环状直流系统暂态量计算方法_*[J].电测与仪表,2018,55(13):01-06.
Xu Yan,Liu Jingyan,Fu Yuan,WANGYI.Calculation Method of Fault Transient Quantity of Ring DC System Based on Fault Model[J].Electrical Measurement & Instrumentation,2018,55(13):01-06.

基于故障模型的环状直流系统暂态量计算方法_*

Calculation Method of Fault Transient Quantity of Ring DC System Based on Fault Model

DOI：

中文关键词: 多端直流系统故障模型保护电容放电阶段

英文关键词:multi-terminal DC system calculation of fault transient quantity decomposition fault model capacitor discharge stage

基金项目:国家重点研发计划(2016YFB0900203)；国家自然科学基金资助项目(51607070)

作者中文名	作者英文名	单位
徐岩	Xu Yan	华北电力大学新能源电力系统国家重点实验室
刘婧妍	Liu Jingyan	华北电力大学新能源电力系统国家重点实验室
付媛	Fu Yuan	华北电力大学新能源电力系统国家重点实验室
王毅	WANGYI	华北电力大学

摘要点击次数: 1643

中文摘要:

多端柔性直流系统线路上发生极间短路时,不同换流站共同作用,导致故障电流上升迅速,故障特性复杂,工程实际中要求在电容放电阶段将故障进行切除,更增加了求解的难度。针对此问题,首先,提出将n端系统电容放电过程分解为n个单端电容单独作用过程,简化了计算量。然后,根据分解前后多端模型与单端模型的参数关系表达式计算出最终结果,并分析参数的变化对故障特性的影响。最后,利用MATLAB/Simulink软件搭建了3端环状直流系统的故障模型,验证了方法的可靠性,为保护方案的设计提出了建议。该方法为直流保护中整定值的计算提供了理论依据。

英文摘要:

When multi-terminal flexible DC system occurs pole-to-pole fault, all the conventer station act together, resulting in the fault current increasing rapidly and the fault characteristics are very complex. It is required to remove the fault before the voltage zero crossing point, but also increased the difficulty of solving. Proposing a practical method to solve the current and voltage transient expression. The n-terminal system capacitor discharge process is decomposed into n single-ended capacitor alone process. According to the calculation results, the influence of the parameter change on the fault characteristics is analyzed. The fault model of 3 - terminal ring DC system is built by MATLAB / Simulink software, which verifies the reliability of the method and provides a new idea for the protection setting.

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