多配电台区柔性直流互联系统换流站定容技术研究

Study on Capacity Setting Technique of Flexible DC Interconnection System in Multi-distribution Station

换流站容量直接关系到柔性直流互联系统的可靠性与经济性。为解决多配电台区通过柔性直流技术实现互联后换流站容量配置问题,建立双层优化模型实现换流站优化定容。其中,内层优化模型以柔性直流互联系统收益、新能源消纳率最高为优化目标,对配电系统的功率互济调度策略进行优化得出系统功率互济最优策略;外层优化模型考虑内层模型给出的功率互济策略以及可靠性、经济性等约束条件,对换流站容载比进行优化,得出换流站最优容载比以及最优容量配置。采用智能优化算法即粒子群算法对优化模型进行迭代求解,以三端柔性直流互联系统为具体算例进行计算分析,结果验证了所提算法的有效性。

The converter station capacity is directly related to the reliability and economy of the flexible direct current(DC)interconnection system.In order to solve the capacity allocation problem of converter station after multi-distribution area is interconnected by flexible DC technology,a two-layer optimization model established to optimize the constant capacity of converter station.Taking the most benefits of the flexible DC interconnection system and the highest consumption of renewable energy as optimization object,the inner optimization model optimizes the power exchange scheduling strategy of the distribution system to obtain the optimal strategy of power exchange.Optimal mutual power support strategy given by inner model and constrain conditions such as reliability as well as economy are considered in outer model,so that optimal capacity-load ratio and the optimal capacity configuration of converter station can be obtained.The intelligent algorithm,such as particle swarm optimization algorithm,is used to solve the optimization model iteratively.Taking a three-terminal flexible and direct interconnection system as an example,the results prove the effectiveness of the method proposed in this paper.