湖南电网220kV线路直流融冰问题研究

摘要

分析了线路融冰顺序、电源点选择以及短路点选择三个融冰线路问题,根据其解决方法和模拟现场参数利用Matlab搭建仿真模型计算线路融冰电流,并选择性加入谐波抑制电抗控制谐波畸变率.利用VFP开发了一套存储查询线路电气参数以及计算融冰时间的防冻融冰管理系统,并根据其计算结果分析了融冰时间与覆冰厚度、融冰电流、风速、气温之间的关系.在娄底220 kV田上线上,采用移动式直流融冰装置,搭建仿真模型计算融冰电流和分析其谐波影响,并通过管理系统计算融冰时间,计算结果与现场融冰的结果基本吻合.%The paper analyzes three line ice-melting problems, including the line sequence of melting ice, power point selection, and short-circuit point selection.According to the solving methods and the simulated parameters, the simulation models to calculate the ice-melting current are built on Matlab, and harmonic suppression reactance is added selectively to contol harmonic distortion.VFP is used to develop a management system of anti-freezing and ice-melting, which can store and inquire line electrical parameters and calculate ice-melting time.Based on the calculating results, the relations between the ice-melting time and the ice thickness, ice-melting current, the wind speed, and the temperature are analyzed.The moving DC ice-melting device is used on 220 kV Tian-Shang line in Loudi.By building simulation models, the ice-melting current is obtained and the harmonics' influence is analyzed, then the ice-melting time is computed by the management system.It's shown that the calculation results basically accord with the results on the spot.