高比例可再生能源电力系统的输配协同优化调度方法

随着可再生能源的高比例接入和主动配电网技术的发展,传统的输配割裂的调度模式容易导致输电网与主动配电网间发、用电计划制定协调性不足,难以充分消纳集中式与分布式的可再生能源。为解决上述问题,提出一种针对高比例可再生能源电力系统的输配电网分层分布式多源协调优化调度体系,充分尊重并利用各利益主体的自主运行特性,实现分散自治、协同优化。输电网层面,利用改进区间法处理可再生能源不确定性,构造能量和备用协调优化模型。配电网层面,设置局部调度层,利用场景法对含储能系统的分布式可再生能源进行联合出力优化,将配电网层子问题构建为动态经济调度模型。在此基础上,利用目标级联法进行输配调度迭代求解,各层间仅需交换部分边界功率信息进行协调,最终获得输配协调的最优调度策略。算例结果表明调度计划的制定兼顾了输、配电网发电资源,有助于提高电网运行经济性和可再生能源消纳能力。

Optimal Dispatch Method of Transmission and Distribution Coordination for Power Systems with High Proportion of Renewable Energy

With the access of high proportion of renewable energy and the development of active distribution network technology in power systems, the traditional dispatch method, namely isolated transmission and distribution scheduling, may lead to incoordination of power generation and consumption planning between the transmission network and the active distribution network, and cannot fully utilize the centralized and distributed renewable energy. To solve the problems above, a hierarchical and distributed coordinated multi-source optimal dispatch scheme is proposed for the power system with high proportion of renewable energy, where the independence of each dispatch level is fully respected to achieve decentralized autonomy and coordinated optimization. At the transmission network level, the improved interval approach is employed to deal with the uncertainty of renewable energy, and the sub-problem is formulated as energy and reserve co-optimization model. At the distribution network level, the local dispatch level is set, and the scenario based stochastic programming is used to perform the united optimization of distributed renewable energy with energy storage integration. Thus, the sub-problem at the distribution network level is formulated as dynamic economic dispatch model. The analytic target cascading (ATC) based iterative method is applied to achieve optimal dispatch strategy of transmission and distribution coordination, while only partial boundary variables are exchanged between each area for coordination. Finally, the case study shows that the proposed coordinated dispatch scheme can take the advantage of power sources in transmission and distribution systems, which helps to improve the power grid operation economy and the ability to accommodate renewable energy.