考虑瞬时功率特性的高压直流电网双极短路故障识别技术  

Identification Technology of Bipolar Short Circuit Fault in High Voltage DC Power Grid Considering Instantaneous Power Characteristics

作　　者：覃刚 张昌庆 姜雪娇 钟磊 周朝俊 吴民 QIN Gang;ZHANG Changqing;JIANG Xuejiao;ZHONG Lei;ZHOU Chaojun;WU Min(Hainan Power Grid Corporation Ltd.,Haikou 570100,Hainan,China)

机构地区：[1]海南电网有限责任公司,海南海口570100

出　　处：《电气传动》2024年第6期83-88,共6页Electric Drive

基　　金：中国南方电网有限责任公司科技项目(073000KK52180005)。

摘　　要：高压直流电网运行过程中,由于受到负载特性和电压波动等因素影响,电容电流及谐波等瞬时功率特性较为复杂,增加了对电网系统故障的识别难度。为此,提出考虑瞬时功率特性的高压直流电网双极短路故障识别技术。通过建立高压直流电网拓扑结构模型,分析高压直流电网的双极短路故障;结合高压直流电网端点的瞬时功率特性判断出双极短路故障发生区域。利用双端故障电流最大值定位法获取双极短路故障定位,完成对高压直流电网双极短路的故障识别。实验结果表明,所提方法对高压直流电网双极短路故障定位识别精度较高,提升了故障识别效率。During the operation of high-voltage DC power grid,due to factors such as load characteristics and voltage fluctuations,the instantaneous power characteristics such as capacitor current and harmonics are more complex,which increases the difficulty of identifying faults in the power grid system.Therefore,a bipolar short circuit fault identification technology for high-voltage DC power grids considering instantaneous power characteristics was proposed.By establishing a topology model of the high-voltage DC power grid,the bipolar short circuit fault of the high-voltage DC power grid was anlyzed.Based on the instantaneous power characteristics of the endpoints of the high-voltage DC power grid,the area where the bipolar short circuit fault occurs was determined.Using the maximum value positioning method of dual terminal fault current to obtain bipolar short circuit fault location,the fault identification of bipolar short circuit in high-voltage DC power grid was completed.The experimental results show that the proposed method has high accuracy in locating and identifying bipolar short circuit faults in high-voltage DC power grids,and the efficiency of fault identification is improved.

关 键 词：高压直流电网 瞬时功率 双极短路 电流最大值定位法 模块化多电平换流器 故障识别 

分 类 号：TM732[电气工程—电力系统及自动化]