A Complementary Power Supply System of Double-bus Microgrid

Abstract

A dual-bus microgrid complementary power supply system proposed by the present invention includes: an energy storage charging bus, an energy storage discharging bus, at least two energy storage modules, a main controller, and multiple microgrids; each grid-connected module is equipped with a common terminal, the first static terminal and the second static terminal; each microgrid and each energy storage module is connected to a corresponding common terminal of the grid-connected module, and the first static terminal and the second static terminal of the grid-connected module are respectively connected to the energy storage The charging bus and the energy storage and discharge bus, and the microgrid and the energy storage module are respectively connected to the energy storage charging bus or the energy storage and discharging bus through the corresponding grid-connected module. In the present invention, through the setting of the energy storage charging busbar and the energy storage discharging busbar, the energy storage module is used as the power transition transfer station to realize the grouping of microgrids with unbalanced power consumption, thereby realizing the integration of microgrids and energy storage in large power grids. The one-way power transfer between units avoids the many-to-many power transfer mode, reduces the micro-grid grid connection loss and the risk of voltage disturbance, which is conducive to reducing power loss and improving the reliability of the micro-grid.

Description

technical field [0001] The invention relates to the technical field of micro-grids, in particular to a complementary power supply system for a double-bus micro-grid. Background technique [0002] The proposal of microgrid aims to realize the flexible and efficient application of distributed power, and solve the problem of grid connection of distributed power with a large number and various forms [1]. The development and extension of microgrids can fully promote the large-scale access of distributed power sources and renewable energy, and realize the highly reliable supply of various energy forms for loads. Smart grid transition. [0003] However, the existing micro-grid grid-connected technology adopts the many-to-many power scheduling method between micro-grids in the grid-connected state, and the grid-connected network loss is large, and the voltage disturbance is large during the grid-connected process, which is not conducive to micro-grids. grid stability. Contents o...

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Problems solved by technology

[0003] However, the existing micro-grid grid-connected technology adopts the many-to-many power scheduling method between micro-grids in the grid-connected state, and the grid-connected network loss is large, and the voltage disturbance is large during the grid-connected process, which is not conducive to micro-grids. grid stability

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