Optimizing and dispatching method for microgrid economical operation on basis of multiple time scale coordination

Abstract

The invention discloses an optimizing and dispatching method for microgrid economical operation on the basis of multiple time scale coordination, comprising the following steps: dividing microgrid economical operation into two time scales, namely a dayahead plan and real-time dispatching; in the dayahead plan, dividing one dispatching period into a plurality of time intervals, and modelling into a mixed integer linear programming program based on the dayahead prediction data; and during the real-time dispatching period, complying with the startup and halt result of the dayahead plan, and modelling into a nonlinear plan based on real-time ultra-short term prediction data. In the optimizing and dispatching method, the coordinated mechanism of two time scales is designed, the dispatching scheme obtained with the method not only can satisfy the economic factors of a long time scale but also can satisfy safe operation constraints, such as the inner microgrid voltage, carrying capacity and the like of short time scales, and the capacity fluctuation of new energy is smoothened. The method is suitable for optimizing and dispatching economical operation in the parallel and single network operation of a micro power grid composed of a controllable power supply, an uncontrolled power supply and energy storage equipment of any type and any volume proportion.

Description

technical field [0001] The invention belongs to the technical field of power system operation, simulation, analysis and dispatching, and in particular relates to a microgrid economical operation optimization dispatching method based on multi-time scale coordination. Background technique [0002] Distributed power generation technology is one of the key technologies for the development of the electric power industry in the 21st century. It has changed the pattern of traditional power production and supply from the bottom, and has many advantages such as low investment, low energy consumption, high reliability, flexible power transmission, and fast restoration of power supply. With the promotion and application of renewable energy represented by wind energy and solar energy in countries around the world, the advantages of distributed power generation technology in energy saving, emission reduction, and prevention of large-scale power outages have been unanimously recognized by...

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Problems solved by technology

Most of the existing research focuses on the optimal scheduling of micro-grid real-time economic operation, ignoring the impact of large-time-scale planning (such as the day before) on the economics of system operation, and lacks multi-time-scale coordination and optimization; Simplified heuristic strategy and overly complex mixed integer nonlinear programming model, the former cannot reach the mathematical optimum and cannot guarantee long-run economics, the latter's solution process is too complicated and it is difficult to find a feasible solution, so neither can satisfy Requirements for economy, safety, energy saving and emission reduction in the actual operation of the microgrid

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