A collaborative planning method of optical/storage and planning islands for distribution networks considering the risk of loss of load

Abstract

With the implementation of national new energy policy and electric power system reform, a large number of distributed energies are connected to the distribution network in various forms. In order to ensure the reliability of power supply for power users, power grid enterprises need to consider the uncertainty of new energy sources and provide them with the necessary backup, but to some extent, this reduces the utilization rate of equipment. In order to avoid this negative effect, the distribution network should adopt active operation strategy under the condition of fault, and fully dispatch distributed energy to participate in fault recovery, in order to improve the load rate of distribution network equipment. The invention establishes a programming model which takes the total investment cost is minimum, the risk of losing load is minimum as multi-objective, voltage stability, power flow does not cross line and the like as constraint conditions, and adopts a programming model based onNSGA-II, the multi-objective evolutionary algorithm is used to solve the problem. The range of planned islands and the location and capacity of photovoltaic and energy storage batteries in the islandsare taken into account in the planning. The validity of the model and the method established by the invention is verified by simulation.

Description

technical field [0001] The invention belongs to the field of distribution network multi-objective planning, and relates to site selection and capacity determination of photovoltaics and energy storage and planning of island ranges. Background technique [0002] With the implementation of the national new energy policy and the reform of the power system, a large number of distributed energy sources are connected to the distribution network in various forms; in order to ensure the reliability of power supply for power users, grid companies need to consider the uncertainty of new energy sources and provide It provides the necessary backup, but this reduces the utilization rate of equipment to a certain extent; in order to avoid this negative impact, the distribution network should adopt an active operation strategy in the event of a fault, and fully dispatch distributed energy resources to participate in fault recovery in order to improve The load rate of distribution network e...

AI Technical Summary

Problems solved by technology

[0004] (1) There are two ways to deal with the reliability index in the objective function, one is to convert the lost load loss into the reliability cost into the objective function, and the other is to use the reliability index as a multi-objective, but most of them do not consider the user failure. Variation in load loss;

[0005] (2) The switch is not considered in the planning, because the probability of island formation is closely related to the location of the switch, the load in the island, and the configuration of the power supply. At the same time, the switch configuration is also related to the economics of grid planning, so ignoring the switch configuration will lead to economical planning. Insufficient accuracy of sex and reliability calculations

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