长距离海缆线路复役引起的主变无功倒送现象分析

Reversed Reactive Power Analysis of Main Transformer Caused by Recommission of Long Submarine Cable Lines

舟山蓬莱供区海缆线路众多,充电功率较大,电网补偿了一定容量的电抗器。舟山柔性直流及大量风电场的接入,对改善电网无功分布有一定积极作用。针对一起长距离海缆线路复役引起的蓬莱供区无功倒送现象,分析柔性直流及风电接入对海岛电网无功的调节作用,并在进行长距离海缆线路复役时,进行无功容量调节时采取相应措施策略(柔直舟衢站、舟洋站定无功控制,增加换流站无功吸收)。实际运行结果表明,舟山柔直运行情况良好,舟山柔直能够对舟山电网的无功调节起到积极作用。

Due to substantial submarine cable lines and large charging power in Penglai power supply service area in Zhoushan, reactors with given capacity are compensated in the power grid. The access of Zhoushan HVDC flexible system and multiple wind farms have positive effect on reactive power distribution. In consideration of the reversed reactive power of main transformer caused by recommission of long submarine cable lines in Penglai power supply service area, regulation of the HVDC flexible system and wind farm access is analyzed; besides, some measures and control strategies（HVDC flexible Zhouqu substation and Zhouyang substation for reactive power control, and reactive power absorption of converter station increased） for the reactive power regulation are proposed during the recommission of long submarine cable. It is shown that Zhoushan HVDC flexible system is in sound operation and plays a positive role in reactive power regulation of Zhoushan power grid.