Microgrid system and operation control method of the microgrid system

Abstract

The present invention discloses a micro-grid system which comprises a DC power supply device, a first DC / DC conversion device, a battery component comprising a battery, a double-direction converting device, a switch component which is provided with multiple switches and is used for selecting a part of switches in the multiple switches to be turned on according to the command of a user, a first switch which is connected between the double-direction converting device and the switch component, and a controller which is used for controlling the operation mode of the micro-grid system according to the turn-on and turn-off states of the switch component and the first switch, wherein the operation mode of the micro-grid system is a grid-connected mode, the double-direction converting device is used for obtaining the current power of a grid and controlling the output power of the double-direction converting device according to the difference between a preset power and the current power of the grid and a preset PI control mode. The micro-grid system allows a load to run in a grid-connected / grid-off mode, the grid makes up power for the load when the system output power is not enough, and the micro-grid system is prevented from injecting electric energy into the grid. The invention also discloses a control method of a micro-grid system.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a microgrid system and an operation control method for the microgrid system. Background technique [0002] With the development of green energy, various forms of energy storage power stations have also begun to be promoted. Due to the limitation of site and operating costs, it is impossible to meet the growing energy demand only by relying on large-scale energy storage power stations, and the relatively convenient and flexible micro-grid system has broad development prospects. The microgrid system may include an online microgrid system and a non-internet microgrid system. Among them, the on-grid microgrid system is connected to the grid, and can operate in the mode of peak shaving and valley filling, photovoltaic smoothing, etc., allowing the microgrid system to inject energy into the grid; the off-grid microgrid system can be connected to the grid, or it can be indepe...

AI Technical Summary

Problems solved by technology

[0003] In the related art, a DC micro-grid system that is connected to the grid and not connected to the grid is proposed. The DC / AC conversion device connected to the DC bus provides energy for the load in this micro-grid system. The disadvantage is that the power required by the load is completely Determined by the DC / AC conversion device, when the load power is greater than the rated output power of the DC / AC conversion device, the microgrid system will not be able to supply power to the load

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