Power distribution network optimization scheduling method considering echelon utilization energy storage
A technology for optimizing dispatching and distribution network, applied in the direction of electrical components, circuit devices, AC network circuits, etc.
Active Publication Date: 2020-03-27
STATE GRID FUJIAN ELECTRIC POWER CO LTD +1
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As an intelligent distribution network covering a variety of distributed energy sources and energy storage systems, the active distribution network has developed rapidly. The evaluation of the maximum power supply capacity of the distribution network is a key part of the grid planning work. However, excessive pursuit of consumption Distributed energy output while ignoring its susceptibility to disturbance will cause the distribution network to lose its regulation ability, so the distribution network optimization method that considers the load margin and its distribution balance is particularly important
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[0061] Such as figure 1 As shown, an optimal scheduling method for distribution network considering cascade utilization of energy storage, the method includes the following steps:
[0062] S1: For the decommissioned power batteries of electric vehicles, through battery sorting and reorganization, form an energy storage system that can be applied to distribution network optimization;
[0063] S2: Calculate the life attenuation degree of the energy storage system, determine the safety margin of cascade utilization of energy storage, and determine the energy storage adjustment constraints in the distribution network optimization model;
[0064] S3: Topological constraints are formed through the spanning tree principle, and the basic power flow constraints of the distribution network are determined using the Distflow model;
[0065] S4: Combining topological constraints and Distflow model, and adopting larger constant M and binary variable β fl The inequality constraints of , re...
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The invention relates to a power distribution network optimization scheduling method considering echelon utilization energy storage. The method comprises the following steps: (1) for retired power batteries of the electric vehicle, forming an energy storage system capable of being applied to distribution network optimization through battery sorting and recombination; (2) calculating the life attenuation degree of the energy storage system, determining the safety margin of echelon utilization energy storage, and determining the energy storage adjustment constraint in the power distribution network optimization model; (3) forming topological constraints through a spanning tree principle, and determining basic power flow constraints of the power distribution network by adopting a Distflow model; (4) rewriting a power flow constraint by combining a topological constraint and a Distflow model and adopting an inequality constraint containing a relatively large constant M and a binary variable; and (5) establishing a multi-objective function with the maximum load margin value and the minimum variance, forming a distribution network optimization scheduling model, and solving to obtain an optimal result. Compared with the prior art, the method is higher in accuracy.
Description
technical field [0001] The invention relates to the technical field of electric power system distribution, in particular to an optimal dispatching method of a distribution network considering cascade utilization of energy storage. Background technique [0002] With the exponential growth of the number of electric vehicles in various countries, the number of retired batteries for electric vehicles will also increase explosively. The battery contains elements such as cobalt, lithium, and some metal materials, and the decommissioned battery is directly scrapped, which pollutes the environment and wastes resources. Using the decommissioned battery for power energy storage maximizes the value under the premise of ensuring safe operation. Reducing the investment cost of energy storage devices can also reduce environmental pollution, which is of great economic value to both the energy storage industry and the battery production industry. [0003] In recent years, energy structure ...
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IPC IPC(8): H02J3/32H02J3/38
CPCH02J3/32H02J3/381Y02T10/40
Inventor 陈伯建黄霆黄道姗张慧瑜林芳苏清梅张伟骏方晓玲杜培刘智煖张健徐振华江伟
Owner STATE GRID FUJIAN ELECTRIC POWER CO LTD