Microgrid energy two-stage robust optimization method and system

Abstract

The invention discloses a microgrid energy two-stage robust optimization method and system. The method comprises the steps: taking operation equipment and a load in a microgrid as constraints, and taking the minimization of the operation cost as a target to construct an island-type microgrid energy scheduling model; constructing an uncertainty set for uncertainty variables in the scheduling model;taking the switching variable as a first-stage variable, taking other energy optimization decision variables as second-stage optimization variables, taking the minimum operation cost as an optimization target, and taking the operation limitation and the uncertainty set of each equipment as constraints to construct a two-stage robust optimization model based on an expected scene; and respectivelysolving a first-stage model and a second-stage model in an alternate iteration mode by adopting a column and cut generation algorithm until convergence to obtain energy optimization results such as micro-grid power generation and power utilization plans. The method and the system are used for solving the problems of conservative decision, poor economy and the like in the prior art, the safe and stable operation of the island-type microgrid in an uncertain environment can be ensured, and the economic operation of the system also can be maintained.

Description

technical field [0001] The invention relates to the technical field of distributed power generation and micro-grid, in particular to a two-stage robust optimization method and system for island-type power grid energy based on expected scenarios. Background technique [0002] The island-type grid is a working mode of the micro-grid when it is separated from the large grid. It is more common in remote areas where the grid is difficult to build and promote, such as Gobi, islands and other places. In such areas, the construction and operation costs of large power grids are high, and there are many difficulties. Therefore, microgrids can only use their own internal controllable power generation equipment and energy storage systems, and at the same time use local wind power, solar energy and other renewable energy for autonomous power supply. . As a relatively closed system, the island-type microgrid will face many uncertain factors in the energy management process of determining...

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Problems solved by technology

[0005] The invention provides a two-stage robust optimization method and system for microgrid energy, which is used to overcome the defects of conservative decision-making and poor economy in the prior art, aiming at the economical operation of the microgrid in the desired scenario, and at the same time ensuring any Under the scenario, the microgrid system can maintain feasible operation, thereby reducing the conservatism of decision-making, which can not only ensure the safe and stable operation of the island microgrid in an uncertain environment, but also maintain a better system economic operation.

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