考虑电动汽车配置的主动配电网鲁棒孤岛恢复
A Robust Islanding Restoration Policy for Active Distribution Network Considering Optimal Allocation of Emergency Electric Vehicles
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摘要: 主动配电网中包含各种分布式发电、电动汽车、储能设备和柔性负荷,因其在时空上的不确定性给配电调度机构的运维带来了挑战。从故障恢复的角度出发,考虑主动配电网中风光机组出力不确定因素,将电动汽车作为应急调度资源,建立了一个形式为min-max-min的三层鲁棒孤岛恢复数学模型,使得在最恶劣的运行场景下,切负荷量最小,即尽量恢复失电负荷;在求解方法上,使用(column&constraint generation,CCG)方法将该三层鲁棒优化模型转化为min松弛主问题和max-min子问题,通过迭代和添加可行割、最优割来得到原问题的最优解;考虑到max-min子问题中Distflow潮流模型中的非凸性,利用松弛技术将子问题转换为一个MISOCP规划模型,同时利用对偶理论将max-min子问题转化为单层max问题。最后,通过PG&E 69配电网系统验证了所提模型和方法的有效性。Abstract: The active distribution network contains various distributed generation, electric vehicles, energy storage equipment and flexible loads, which pose challenges to the operation and maintenance plan of the grid enterprise due to its uncertainty in the domain of time and space. From the point of service restoration after a blackout, this paper considers the uncertain factors of wind and photovoltaic in active distribution networks and uses electric vehicles as emergency dispatching resources. A three-layer robust islanding recovery mathematical model in the form of min-max-min is established which ensures the minimum load shedding in the worst case. In terms of solving method, the three-layer robust optimization model is con v e r t e d to a re l a xe d ma in pr o b l e m an d a ma x-m i n sub-problem using the Column & Constraint Generation(CCG)method. By adding feasible cuts and optimal cuts iteratively into the relaxed main problem, the optimal solution of the original problem is obtained. Considering the non-convexity of t h e D i s t f l o w p o w e r f l o w e q u a t i o n s i n t h e m a x-m i n sub-problem, the sub-problem is converted into a MISOCP pr o gr a m m i ng mo de l by us i n g re l a x a t io n te c hn i q u e s.Meanwhile, the duality theory is utilized to transform the max-min sub-problem into a single-layer max problem. Finally,the effectiveness of the proposed model and method is verified by the simulations of PG&E 69 distribution network system.