Power pool-based dual-layer bus direct microgrid and control method therefor

Abstract

The invention relates to a direct current microgrid, specifically relates to a power pool-based dual-layer bus direct microgrid and a control method therefor, and solves the problems of high energy conversion loss and low system operating efficiency of the existing single-bus direct current microgrid, and high probability of power interference and poor system operating economy of the existing dual-bus direct current microgrid. The power pool-based dual-layer bus direct microgrid comprises an energy storage voltage regulation system, a direct current sub grid I and a direct current sub grid II, wherein the energy storage voltage regulation system comprises a power pool, a lithium battery pack, a DC / DC converter I, a DC / DC converter II and a DC / DC converter III; the power pool comprises a supercapacitor and a middle bus in parallel; the direct current sub grid I comprises a photovoltaic power generation unit I, a direct current load I and a direct current bus I; the direct current sub grid II comprises a photovoltaic power generation unit II, a direct current load II and a direct current bus II; and the direct current sub grid I and the direct current sub grid II have different voltage levels. The power pool-based dual-layer bus direct microgrid is applicable to a variety of fields.

Description

Technical field [0001] The invention relates to a DC micro-grid, in particular to a double-layer bus-bar DC micro-grid based on a power pool and a control method thereof. Background technique [0002] As people pay more and more attention to energy and environmental issues, clean energy represented by wind and solar energy has increasingly shown its superiority over traditional fossil energy, but these distributed energy sources are inherently intermittent and random. To realize the efficient use of distributed energy, people integrate distributed power, energy storage and load, and put forward the concept of microgrid. Compared with the traditional AC microgrid, the DC microgrid has a simple control method and does not need to consider issues such as reactive power, frequency, phase synchronization, etc. It can operate in islands or grid-connected, so it has been recognized by experts at home and abroad. At the same time, the emergence and development of a large number of DC so...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of high energy conversion loss and low system operation efficiency of the existing single-bus DC micro-grid, the existing double-bus DC micro-grid is prone to power interference and poor system operation economy, the present invention provides a double-layer power grid based on a power pool. Busbar DC microgrid and its control method

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