含综合能源的多直流电压等级互联电网运行控制及其直流故障隔离策略

Operation control and DC fault isolation strategy of a multi-DC voltage level interconnected power grid integrating with energy sources

为了满足不同地区的电力分配、电压等级和灵活调度需求,采用柔性直流输电技术构建互联电网成为了当前的主要趋势。文中分析了风电、光伏、DC/AC及DC/DC等关键组网设备的运行控制策略,组建了含新能源的多直流电压等级互联电网,分析了其结构特点和运行原理。为了应对不同位置的直流故障,提出了基于DCCB的故障隔离策略,在PSCAD/EMTDC平台下搭建了仿真模型,进行了不同工况的仿真分析,仿真结果验证了所提出的控制运行与直流故障隔离策略的有效性。

In order to meet the power distribution,voltage level and flexible scheduling requirements of different regions,establishing an interconnected power grid based on HVDC technology has become a popular trend.This paper firstly analyzes the operation control strategies of key equipment of the interconnected grid such as wind power,photovoltaic,DC/AC and DC/DC.Then,a multi-DC voltage level interconnected power grid with new energy is built,and its structural characteristics and operation principle are analyzed.Besides,in order to isolate DC faults in different locations,a fault isolation strategy based on DCCBs is proposed.Finally,the simulation model is built under the PSCAD/EMTDC platform,and the simulation analysis under different working conditions is carried out to verify the effectiveness of the proposed operation control and DC fault isolation strategy.