基于大湾区外环的柔性直流互联方案

面对日益严峻的短路电流超标、交直流交互影响、第三道防线难以有效设置等问题,广东等多直流馈入受端电网分区构网需求迫切。为协调分区与系统稳定、网架可靠性等方面的矛盾,支撑区内电力消费增长和大规模清洁能源接入,提出了建设大湾区外环的设想,并对广东电网大湾区外环覆盖范围、分区划分和外环容量选择等关键问题进行了具体论证,形成了基于大湾区外环的柔性直流互联构网方案。经仿真分析,该方案符合安全标准,可提升广东电网容量至预期水平且有效应对了短路电流超标、交直流交互影响突出、第三道防线难以有效设置等问题。

Flexible DC Interconnection Scheme Based on the Outer Ring of Guangdong-Hong Kong-Macao Greater Bay Area

Facing the increasingly severe problems like short circuit current exceeding limit,serious AC-DC interaction and difficulty in setting up the third defensive line,system partition in multi-DC infeed receiving power grids like Guangdong power system is urgently required.In order to solve the contradiction between system partition and system stability and reliability,and support regional power consumption growth and large-scale clean energy access,an idea of building the outer ring of the Guangdong-Hong Kong-Macao Greater Bay Area is proposed.Key issues like coverage of the outer ring of the Bay,partition scheme of Guangdong power grid and capacity selection of the outer ring are specifically discussed.Then the flexible DC interconnection network scheme based on the outer ring of the Guangdong-Hong Kong-Macao Greater Bay Area is formed.Simulation analysis indicate that the scheme could meet the relevant safety standards,the capacity of Guangdong power grid could be increased to the expected level and problems such as short circuit current exceeding standards,serious AC-DC interaction and difficulty in setting up the third defensive line are effectively dealt with.