Low-voltage multi-source parallel power supply system structure based on alternating current and direct current hybrid bus

A technology of AC-DC hybrid and power supply system, which is applied in the direction of AC-DC network circuit layout, electrical components, circuit devices, etc., can solve problems affecting economy, improve economy, improve operating efficiency and economy, and realize trend The effect of equalization control

Inactive Publication Date: 2017-09-15
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Since each DC power source requires its own inverter, mutual influence and less economical

Method used

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  • Low-voltage multi-source parallel power supply system structure based on alternating current and direct current hybrid bus

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Embodiment Construction

[0017] as attached figure 1 As shown, the low-voltage busbar is divided into three sections by two AC / DC converters. The two sides directly connected to the traditional medium-voltage incoming line are the AC section, and the middle section is the DC section. The AC / DC converter between the AC and DC sections can realize the unified bidirectional flexible conversion of AC and DC power according to the power supply and load conditions on both sides and the bus voltage on the DC side, and can also realize the power flow balance control of the AC systems on both sides.

[0018] The AC low-voltage bus has multiple medium-voltage incoming lines (i, k are the number of medium-voltage incoming lines), which are connected to the distributed power supply with AC output and supply power to the AC load; the middle DC low-voltage bus is directly connected to the following Take DC current source as an example of DC output distributed power supply, and directly supply power to DC loads (whe...

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Abstract

The invention discloses a low-voltage multi-source parallel power supply system structure based on an alternating current and direct current hybrid bus. In a low-voltage multi-source parallel power distribution system, a low-voltage bus is divided into an alternating current segment and a direct current segment; an alternating current bus segment accesses an alternating current load, a traditional middle voltage incoming line and an alternating-current-output distributed power supply; and a direct current bus segment accesses a direct-current-output distributed power supply and a direct current load through DC / DC conversion or in a directly way. Direct current segment and alternating current segment buses are connected through an AC / DC converter. Uniform bidirectional flexible transformation of alternating current and direct current electric energy can be realized and trend equalization control of two side alternating current systems can be realized too. When a fault is generated, a power electronic device in a direct latching converter can achieve a rapid protection or current limiting effect. Two side alternating current systems are separated. When a short circuit fault is generated, a short circuit current is automatically limited so that a short circuit capacity of the system is reduced. By using the above structure, economy, power supply reliability and safety of the system are increased, and the structure is good for access of a distributed power supply.

Description

technical field [0001] The invention relates to the field of power distribution systems, in particular to the structure of a low-voltage multi-source parallel power supply system including distributed power sources. Background technique [0002] The low-voltage multi-source parallel power supply system can effectively improve the reliability of power supply and facilitate the friendly access of distributed power sources. It has become a new low-voltage power distribution mode and has been successfully applied. According to the output voltage characteristics of distributed power, it can be divided into distributed power with AC output and distributed power with DC output. The former, such as wind turbines, internal combustion engine-generator sets, etc., can be directly connected to low-voltage AC systems; the latter For example, fuel cells, photovoltaic panels, etc., each power supply needs to be connected to a low-voltage AC system through a DC / AC converter. Since each DC ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J4/00
CPCH02J4/00
Inventor 仉志华赵倩鹏田咏桃王斌曲泽奇
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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