Joint optimization method and system for planning and operation of energy storage system in photovoltaic-containing power distribution network

Abstract

The invention provides a joint optimization method and system for planning and operation of an energy storage system in a photovoltaic-containing power distribution network. The method comprises the steps of building a three-layer robust optimization model for planning the energy storage system of the power distribution network, wherein the three-layer robust optimization model includes a planningmain problem model, a safety verification sub-problem model and an economic operation optimal sub-problem model; and solving through three-layer iteration to obtain the optimal solution in consideration of the worst scenes of different conditions under voltage out-of-limit safety analysis and economic optimal operation through three-layer decomposition of the robust optimization model. The sourceload uncertainty is fully considered, and the optimal configuration scheme in the worst scene is sought on the basis of ensuring that the voltage out-of-limit problem does not occur to the power distribution network. However, the problem is complicated due to too many dependent variable dimensions, so that the original problem is decomposed into a planning main problem, a safety verification sub-problem and an economic operation optimal sub-problem according to a decomposition theory, and iterative solution is carried out conveniently, quickly and effectively.

Description

technical field [0001] The present disclosure relates to the technical field of distribution network energy storage, in particular to a joint optimization method and system for energy storage system planning and operation in a photovoltaic distribution network. Background technique [0002] With the large-scale access of high-penetration distributed photovoltaics, the voltage limit problem of the distribution network is becoming more and more serious. However, in recent years, the energy storage technology has been continuously matured and the cost has been continuously reduced, which has enabled the promotion of the integrated solar storage system. Carry out arbitrage operations based on the characteristics of reserves and high issuance. However, multiple uncertainties such as source and load in the distribution network have brought huge challenges to the planning and operation optimization of the energy storage system, making it impossible for the energy storage system to...

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Problems solved by technology

[0004] (1) To absorb photovoltaics by increasing the grid structure and load transfer, but the cost of transformation is relatively high, and it is difficult to have economic benefits;

[0005] (2) Photovoltaic itself participates in the regulation of reactive power, and even cuts active power in critical periods to solve the overvoltage problem, but this solution may damage the economic interests of photovoltaic investors. How to participate in the regulation fairly, justly and actively has always been a need to solve the puzzle

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