移相变压器应用于输电线路在线融冰方法与仿真研究

Deicing Method and Simulation of Phase-shifting Transformer for on-load Transmission Lines

针对传统直流融冰过程中线路需要停运,且存在融冰时间长、谐波污染等局限,该文提出了应用移相变压器实现输电线路在线融冰的方法。首先理论推导了采用移相变压器用于在线融冰原理,得到了环流融冰过程中有功、无功消耗及电压降落的计算公式。其次,基于典型220kV主网线路融冰电流要求,设计了融冰用移相变压器,并在MATLAB建立了计及阻抗变化的移相变压器等效电路模型。最后论文以贵州电网东部地区220kV线路融冰需求为工程算例,仿真计算得到线路在空载和负载情况下线路融冰过程的电压降落、无功补偿策略。基于移相变压器的输电线路融冰研究为在线融冰提供了理论支撑和工程技术实现提供了参考。

The transmission line needs to be shut down during the traditional DC ice melting process,such process has limitations such as long ice melting time and harmonic pollution,In view of this situation,a method to achieve online ice melting of the transmission line based on the phase-shifting transformer is proposed in this paper.The theoretical calculation formula for deicing on-load transmission lines using phase-shifting transformer is deduced,and the calculation method of the active power,reactive power and voltage drop in the circulation ice-melting process is given.Secondly,based on the ice-melting current consumption requirements in the 220kV transmission line,the parameters of phase-shifting transformer for ice-melting are designed,and the equivalent circuit model of the phase-shifting transformer considering the changing impedance is established in MATLAB.Finally,considering the ice melting demand of the 220kV lines in the eastern part of Guizhou Power Grid Co Ltd,a simulation model is established.The voltage drop and reactive power compensation strategies of the lines during the ice melting process under no-load and load conditions are calculated.The research on deicing on-load transmission lines based on phase-shifting transformers provides theoretical support and engineering technology for deicing on-load transmission lines.