Networking method for minitype electric network

Abstract

The invention discloses a networking method for a micro grid. The method is characterized in that: an AC generation source is connected with a DC bus through an AC / DC converter; a DC generation source is connected with the DC bus through a DC / DC converter; the DC bus is connected with a large power grid through a grid-connected inverter; the DC bus is connected with a power accumulator; and the AC / DC converter, the DC / DC converter and the grid-connected inverter are controlled by a system controller. The micro grid of the invention can be connected with a plurality of generation sources with different power generation properties and promote the development of micro grids. A networking structure of the DC bus can reduce the control difficulty of the micro grid and improve the power supply quality of the micro grid. The networking structure of the DC bus has a great advantage in connection of the micro grid to the large power grid and can adjust the grid-connection output active power and inactive power of the micro grid through the grid-connected inverter during grid connection in favor of the large power grid.

Description

Technical field [0001] The invention relates to a networking method of a micro-grid, in particular to the networking of a micro-grid containing power generation sources of different power generation properties. Background technique [0002] Microgrid technology refers to a system that connects dispersed power generation resources (such as self-powered power generation equipment or backup generator sets, solar power generation equipment, wind power generation equipment, diesel power generation equipment, etc.) in a certain area. It can provide users The power supply can also be operated in parallel with the main large-scale power grid through the distribution link. [0003] Chinese patent ZL02136471.0 discloses a distributed power networking and power supply method. It uses distributed small generators to connect generators in a region to each other, users are connected to the grid, and users are also connected to each other. However, the patent does not disclose a specific networ...

AI Technical Summary

Problems solved by technology

[0006] First of all, if the AC power generation source is connected to the grid through AC, strict requirements must be imposed on the frequency, voltage and phase of the AC power generation source, which increases the difficulty of micro-grid control and cannot guarantee the grid voltage well, such as wind power generation. unit

[0007] Secondly, the AC-DC hybrid transmission network is adopted, and its cost is relatively high

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