Offline operation control method suitable for user-side microgrid

Abstract

The invention discloses an offline operation control method suitable for a user-side microgrid. Research is carried out on an offline operation mode in the microgrid, a microgrid coordination control strategy of a layered structure is employed, the layered structure comprises a local control layer and a centralized control layer, and the method is applied to coordination control between multiple power sources and loads under multiple operation conditions. According to the invention, under the condition that the quality of electric energy is guaranteed, by full use of the generating advantages of various micro power sources, the micro power sources of multiple types in the user side microgrid can be coordinated and controlled efficiently and reliably so that the requirements of the mcirogrid for energy balance and output are met. The method is simple and practical, the voltage and the frequency inside the microgrid are enabled to be stable, safe operation of important loads is guaranteed, at the same time, the output of a photovoltaic power generation system is fully utilized, and the utilization rate of regenerative energy is improved.

Description

technical field [0001] The invention relates to the technical field of power grids, in particular to a method for controlling off-grid operation of a microgrid. Background technique [0002] With the gradual depletion of fossil energy and the increasing environmental pollution, the development and utilization of clean energy and renewable energy has become an inevitable choice. Renewable energy such as solar energy and wind energy has been rapidly developed and widely used in the world. At the same time, with the rapid development of industrial civilization, the demand for electricity is increasing day by day, and the scale of traditional power grids continues to expand. Ultra-high voltage and long-distance centralized power transmission methods are facing more and more challenges. Based on the above background, Distributed Generation (Distributed Power Generation) Generation, DG) technology has been widely concerned and valued by researchers at home and abroad. The develop...

AI Technical Summary

Problems solved by technology

After searching the existing technical literature, it was found that (a microgrid system and energy control method for grid-connected and off-grid operation, Chinese Patent No.: 201310618109.7) proposed a control method for off-grid operation, which passed detection The SOC (State of Charge, state of charge) of the battery controls the supercapacitor to correct the charge and discharge state of the battery, and makes the microgrid run stably through the central controller, energy control device, and load controller, but the coordination of the controller is very demanding. high

Existing micro-grid coordinated control strategies have their own advantages and disadvantages, and it is difficult to popularize and apply them on a large scale, and there are few studies on off-grid operation.

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