Configuration method of PV-storage system in web-based cellular distribution network considering balance of economy and resilience
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摘要: 新型源荷的广泛接入和不确定性增加了配电网安全运行风险，日趋频繁的极端灾害给配电网带来巨大损失，亟须提升配电网的承载能力和韧性。将光伏和储能作为一个系统进行配置，可以有效降低光伏接入带来的不确定性。现有光储系统规划大多考虑单条馈线的负荷需求，没有在更大范围内进行资源的优化调配。为此提出了一种考虑经济性和韧性均衡的网格化配电网光储系统优化配置方法。首先，基于光储系统出力模型，分析了正常和极端灾害场景下光储系统的调控机理；然后，以经济性和韧性的纳什均衡为目标，考虑网格内不同供电单元对光储系统配置需求差异等约束，建立了网格化配电网光储系统双层优化规划模型；最后，对实际配电网进行光储系统优化配置。算例结果表明所提方法可以充分考虑网格内部不同供电单元的配置需求，在有限投资内最大程度提升配电网韧性。Abstract: The wide access and uncertainty of new sources and loads increase the risk of safe operation of the distribution network.The increasingly frequent extreme disasters bring huge losses to the distribution network, and it is urgent to improve the bearing capacity and resilience of the distribution network. Configuring photovoltaic and energy storage as a whole system can effectively reduce the uncertainty caused by PV access. Most of the existing PV-storage system planning considers the load demand in a single feeder for configuration, and does not optimize the allocation of resources in a larger range. Therefore, an optimal configuration method of PV-storage system in power mesh considering economy and resilience balance is proposed. Firstly, the output model of PV-storage system is established, and the regulation mechanism of PV-storage system under normal and extreme disaster scenarios is analyzed. Secondly, taking the economy and toughness Nash equilibrium optimization as the overall goal, considering the constraints of different power supply units in the grid on the difference of the configuration requirements of the PV-storage system, a bi-level optimal planning model of the optical storage system in the power mesh is established. Finally, the optimal configuration of the PVstorage system for the actual distribution network is optimized. The results show that the proposed method can fully consider the configuration requirements of different power supply units in the grid and maximize the resilience of the distribution network within the limited investment.
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