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Low-voltage DC power supply system for buildings

A low-voltage direct current, power supply system technology, applied in the direction of direct current network circuit devices, electrical components, circuit devices, etc., can solve the problems of power supply safety and low reliability, and achieve the effect of improving reliability

Active Publication Date: 2019-08-16
XJ ELECTRIC +3
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a low-voltage DC power supply system for buildings, which is used to solve the problems of low power supply safety and reliability of the existing DC power supply systems for buildings

Method used

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  • Low-voltage DC power supply system for buildings
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  • Low-voltage DC power supply system for buildings

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Embodiment approach

[0021] The rated capacity of the step-down transformer is determined by the total DC load in the actual access power supply area, and the corresponding calculation formula is:

[0022] P 1 =P 总 *K

[0023] Among them, P 1 is the rated capacity of the step-down transformer, P 总 is the total DC load in the actually connected power supply area, P 总 =P e *N / 1000,P eFor each user's electricity consumption index, for relatively developed areas, each user's electricity consumption index is taken as 12kw; for general areas, each user's electricity consumption index is taken as 9kw; The user's power consumption index is 6kw, N is the total number of users in the low-voltage DC power supply system of the building; K is the simultaneous rate, the more users, the smaller the K value, K = 0.55 for less than 50 households, and K = 0.45 for 50 to 100 households , K=0.40 for 100-200 households, and K=0.35 for more than 200 households.

[0024] The formula for calculating the rated cur...

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Abstract

The invention relates to a low-voltage DC power supply system for buildings, which comprises an AC bus and at least one building low-voltage DC bus corresponding to buildings. Each building low-voltage DC bus is connected with a power inlet line for accessing external AC power. The AC bus is correspondingly connected with the power inlet lines corresponding to the building low-voltage DC buses through AC output lines. Each power inlet line is equipped with an AC / DC conversion device used for converting AC power into DC power. For any building low-voltage DC bus, the building low-voltage DC busis connected with at least two household low-voltage DC buses corresponding to users, each household low-voltage DC bus is connected with at least two power supply lines used for supplying power to DC loads at different voltage levels, and at least one power supply line is equipped with a DC / DC conversion device. The low-voltage DC power supply system for buildings of the invention can meet the requirement for diverse users and diverse voltage levels in buildings, and improves the safety and reliability of DC power supply.

Description

technical field [0001] The invention relates to a low-voltage direct current power supply system for buildings, belonging to the technical field of direct current distribution networks. Background technique [0002] With the development of high-power power electronic devices, high-voltage converter stations, and high-voltage DC transmission technology, there are many DC transmission projects in my country, which provide a foundation for the construction of DC power distribution. DC power distribution can alleviate the contradiction between limited corridors of AC grid sites and high load density, and it has better acceptance of DC loads, an obvious trend of end-user load DC and better demand for high-quality power consumption, which is easy for future distributed energy and energy storage. Advantages such as high-density access and full utilization of demand. At present, although the electrical equipment is powered by AC, most of them are finally powered by DC and need to u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/00
CPCH02J1/00H02J1/082Y02E60/60
Inventor 李传西吴庆范戴国安倪传坤黄金海张爱玲卢星海田培涛雷玉磊付艳苏雨晴
Owner XJ ELECTRIC
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