|
|
|
| Analysis and optimization of overvoltage after fault blocking in back-to-back DC transmission |
| LIU Qiao, WANG Junsheng |
| NR Electric Co., Ltd, Nanjing 211102 |
|
|
|
|
Abstract When a DC bus ground fault occurs near the grounding point in a back-to-back DC transmission system, overvoltage may occur after the system is blocked. This paper analyzes the short-circuit circuit formed between the fault point and the grounding point, which causes the valve short-circuit protection to act before the pole grounding protection. In such a fault situation, the valve short-circuit protection action X block, causing overvoltage in the DC system during the blocking process. But the DC bus ground fault to act Y block, or the valve short-circuit fault to act X block, does not appear the overvoltage phenomenon after blocking. In this paper, the ground current is introduced as an auxiliary criterion, and two optimization methods are proposed. When the same DC bus ground fault occurs near the grounding side, the control system selectively performs different blocking mode. It can effectively avoid the DC system overvoltage after blocking, and is beneficial to the reliable isolation of power system faults and reduce the risk of the system’s primary equipment operation.
|
|
Received: 18 October 2023
|
|
|
|
| Cite this article: |
|
LIU Qiao,WANG Junsheng. Analysis and optimization of overvoltage after fault blocking in back-to-back DC transmission[J]. Electrical Engineering, 2024, 25(3): 79-84.
|
|
|
|
| URL: |
|
http://dqjs.cesmedia.cn/EN/Y2024/V25/I3/79
|
[1] 陶瑜, 龙英, 韩伟. 高压直流输电控制保护技术的发展与现状[J]. 高电压技术, 2004, 30(11): 8-10.
[2] 赵畹君. 高压直流输电工程技术[M]. 北京: 中国电力出版社, 2004.
[3] 袁清云. 特高压直流输电技术现状及在我国的应用前景[J]. 电网技术, 2005, 29(14): 1-3.
[4] 刘振亚. 特高压电网[M]. 北京: 中国经济出版社, 2005.
[5] 张颖, 邰能灵, 徐斌. 高压直流输电系统阀短路保护动作特性分析[J]. 电力系统自动化, 2011, 35(8): 97-102.
[6] 王俊生, 朱斌. 逆变侧换流变阀侧连接线单相接地动作策略分析[J]. 电力系统自动化, 2010, 34(23): 119-123.
[7] 张庆武, 王永平, 陈小军, 等. 特高压直流控制保护系统设计与开发[J]. 电力系统自动化, 2013, 37(21): 88-93.
[8] 陶瑜, 马为民, 马玉龙, 等. 特高压直流输电系统的控制特性[J]. 电网技术, 2006, 30(22): 1-4.
[9] 徐海军, 阮思烨, 吕鹏飞. 高岭背靠背直流50Hz和100Hz保护动作分析[J]. 电力系统保护与控制, 2010, 38(4): 54-57.
[10] 吕彦北, 卢东斌, 李林, 等. 直流线路故障时抑制交流过电压的延时移相策略研究[J]. 电气技术, 2023, 24(5): 76-81.
[11] 方乙君. 云霄背靠背换流站接地系统设计[J]. 电气技术, 2023, 24(10): 39-43.
[12] 贾轩涛, 熊飞, 张玉铎. 某特高压直流输电工程直流电压异常分析及解决措施[J]. 电气技术, 2023, 24(11): 65-70.
[13] 肖龙, 李泰, 李艳梅, 等. 高压直流输电线路故障模拟与重启动策略[J]. 电气技术, 2023, 24(8): 70-73, 77.
[14] 龙磊. 特高压混合多端直流系统故障退站后处置方法研究[J]. 电气技术, 2023, 24(3): 44-51.
[15] 尹海涛, 赖皓, 潘立邦. 特高压换流站极解锁时过压保护动作分析及改进措施研究[J]. 电工技术, 2020(8): 88-89, 92. |
|
|
|
2024, Vol. 25 
