Networking method for minitype electric network

A micro-grid and networking technology, which is applied to electrical components, circuit devices, AC network circuits, etc., can solve the problems of not being able to ensure the voltage on the network, high cost, and increased difficulty in micro-grid control, and reduce the difficulty , reduce power transmission loss, and reduce the cost of the controller

Inactive Publication Date: 2009-05-20
SOUTH CHINA UNIV OF TECH
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  • Description
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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

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  • Networking method for minitype electric network

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Embodiment Construction

[0019] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0020] As attached figure 1 The DC bus micro-grid shown includes DC power source 1, unsteady AC power source 3, controllable power, constant voltage AC power source 5, DC load 15, AC load 7, inverter 8, grid-connected inverter The device 16, the storage 11, 13, and the system controller 14.

[0021] (1) The voltage of the DC bus 9 is a constant voltage V set by the system controller. The DC power source 1 (such as solar power) keeps the output voltage at a constant voltage V through the DC / DC converter 2, and the system controller 14 detects The output power of the DC generator gives the DC / DC converter 2 a voltage holding command.

[0022] (2) The unsteady AC power source 3 (such as wind power generation) keeps the output voltage at a constant voltage V through the AC / DC converter 4, and the system controller 14 obtains the output power of the unsteady AC power ...

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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...

Claims

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Application Information

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IPC IPC(8): H02J1/10H02J3/00H02J3/38
Inventor 康龙云张彦宁吴捷陈渊睿郭红霞
Owner SOUTH CHINA UNIV OF TECH
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