500 kV同塔双回输电线路感应电压和感应电流建模分析

Modeling and Analysis of Induced Voltage and Induced Current of 500 kV Double circuit Transmission Lines on the Same Tower

摘要:

考虑到同塔双回输电线路一回运行、一回停运时，在停运线路上可能产生较大的感应电压和感应电流，对检修人员和设备产生一定的安全隐患。为了研究不同运行工况下的感应电压和感应电流，利用ATPEMPT软件建立了500 kV同塔双回架空输电线路仿真模型；计算分析了线路长度、输送功率、运行电压和土壤电阻率对感应电压和感应电流的影响；最后，利用混合差分进化-粒子群优化算法对上述影响因素与感应电压和感应电流进行多变量拟合。结果表明：线路长度对电磁感应电压、静电感应电流和电磁感应电流影响较大；输送功率对电磁感应电压和电磁感应电流影响较为显著；运行电压对静电感应电压、电磁感应电压、静电感应电流和电磁感应电流均有影响，几乎均成正比关系；土壤电阻率对电磁感应电压和电磁感应电流有一定影响。通过多元拟合分析，建立了上述影响因素与感应电压和感应电流的函数关系，为后续工程中感应电压、感应电流的估算提供了参考。

Abstract:

When one circuit of transmission line operates and the other circuit of transmission line stops, large induced voltage and induced current may be generated on the shutdown line, which has certain potential safety hazards for operators and equipment. In order to study the induced voltage and induced current under different operating conditions, a simulation model of 500 kV double circuit overhead transmission line on the same tower is established by using ATP EMPT software. Then, the effects of line length, transmission power, operating voltage and soil resistivity on induced voltage and induced current are calculated and analyzed by the model. Finally, the hybrid differential evolution particle swarm optimization algorithm is used to fit the formula of induced voltage and induced current. The results show that: the line length has a great influence on the electromagnetic induced voltage, electrostatic induced current and electromagnetic induced current. The transmission power has a significant effect on electromagnetic induced voltage and electromagnetic induced current. The operating voltage has an effect on the induced voltage and induced current, almost in direct proportion. Soil resistivity has a certain effect on electromagnetic induced voltage and electromagnetic induced current. Through multi variable fitting analysis, the functional relationship between the above influencing factors and induced voltage and induced current is obtained, which provides a reference for the estimation of induced voltage and current in subsequent projects.