摘要
针对带并联电抗器的同杆双回线线路,在复频域上对故障相端电压进行详细分析,提出利用故障相β模电压进行故障性质判断的方法,其中β模电压为不同回线故障相电压平均值之差。以IABIIBC跨线故障为例进行仿真分析,综合得出利用故障相β模电压进行判断的结论,并给出了不同故障类型下的β模电压求解通式。瞬时性跨线故障下β模电压中既存在工频分量又存在自由频率分量;而永久性跨线故障下β模电压中只存在工频分量。通过利用最小二乘法提取其中自由频率分量幅值可以准确判断出故障性质,原理简单,灵敏度高。大量ATP仿真实验表明,该方法能够识别不同跨线故障类型的故障性质,可以应用于带并联电抗器同杆双回线的自适应重合闸。
The terminal voltage of faulty phase in common-tower double circuit transmission lines with shunt reactors is analysed in complex frequency domain in detail, and a method to identify the property of the fault by β mode voltage in the fault phases is proposed, here the β mode voltage is the mean value difference of voltages of fault phases in different circuits. Simulation of the IABIIBC cross-country fault is performed and a conclusion that the properties of cross-country faults can be identified by β mode voltage of fault phases is attained synthetically, and the general formula to calculate the β mode voltage under different types of cross-country faults is given. Under transient cross-country faults both power frequency component and free frequency component exist in the β mode voltage; under permanent cross-country faults only power frequency component exists in the β mode voltage. Extracting the amplitude of free frequency component in the β mode voltage by least squares method the property of the fault can be identified exactly. The principle of the proposed method is simple and it is of high sensitivity. A lot of ATP simulation results show that using the proposed method the properties of different types of cross-country faults can be identified, and this method can be applied to adaptive reclosure of common-tower double-circuit transmission lines with shunt reactors.
出处
《电网技术》
EI
CSCD
北大核心
2014年第7期2001-2007,共7页
Power System Technology
关键词
同杆双回线
跨线故障
故障性质
β模电压
double-circuit transmission line on the same tower
cross-country fault
fault properties
β mode voltage
