镇海—舟山500 kV海底电缆输电线路无功补偿仿真研究

Simulation Study on Reactive Compensation of Zhenhai-Zhoushan 500 kV Submarine Cable Transmission System

镇海-舟山输电线路将在宁波镇海至舟山大鹏岛之间架设长约17km的交流500kV交联聚乙烯海缆,这是世界上第1个交流500kV交联聚乙烯绝缘海底电缆的跨海联网工程。为研究该工程的无功补偿及电磁暂态等问题,采用PSCAD/EMTDC软件建立了全线路仿真计算模型。在计算分析线路参数、无功功率、工频谐振过电压、潜供电流和恢复电压的基础上,提出了线路高抗配置、高抗中性点小电抗等方面的设计方案。研究结果表明,工程全线无功功率合计为318MVA,建议线路两侧各架设容量约为140MVA的主电抗,同时在电抗器中性点装设大小为0.1 H的小电抗。

An AC 500kV XLPE submarine cable with a length of about 17km will be erected between Zhenhai of Ningbo and Dapeng Island of Zhoushan in Zhenhai-Zhoushan Transmission Line.It is the world’s first sea-crossing project using 500kV XLPE submarine cable.In order to study the reactive power compensation and electromagnetic transient of the project,we established a whole network simulation calculation model by using PSCAD/EMTDC software.By calculating and analyzing the line parameters,reactive power,power frequency resonant overvoltage,secondary arc current and recovery voltage,we put forward a design scheme of the configuration of HV reactor for power network project and small reactor for the neutral of HV reactors.The results show that the total reactive power of the project is 318 MVA.It is suggested that the main reactor with a capacity of 140 MVA should be installed on both sides of the line,and a neutral inductance of 0.1H should be installed.