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Remote distributed DC power supply system and control method thereof

A technology of power supply system and control method, applied in parallel operation of DC power supply, DC network circuit device, AC network circuit, etc., can solve problems such as no long-distance transmission voltage compensation and control content, and difficulty in long-distance DC transmission.

Pending Publication Date: 2017-11-28
山东鼎维数字技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent document can only be used as an uninterruptible power supply, without voltage compensation and control content for long-distance power transmission, it is difficult to achieve long-distance DC power transmission over a kilometer level

Method used

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  • Remote distributed DC power supply system and control method thereof
  • Remote distributed DC power supply system and control method thereof
  • Remote distributed DC power supply system and control method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A remote distributed DC power supply system, including a cable for a DC bus, a plurality of distributed power generation modules and distributed load modules arranged on the cable, and a bidirectional inverter arranged at one end of the DC bus to realize Grid-connected; the distributed power generation module is a current-type power supply.

[0036] The system also includes a control loop for closed-loop regulation between the distributed generation module, the distributed load module and the bidirectional inverter.

[0037] When the bidirectional inverter is in the rectification working state, the control loop includes: a voltage regulator, a minimum voltage judgment module, an overload regulation module and a voltage limiting module for controlling output. When the bidirectional inverter is in the rectification working state, it is called a rectifier. The output voltage limit given value of the rectifier and the actual output voltage value of the rectifier are compar...

Embodiment 2

[0040] A remote distributed DC power supply system as described in Embodiment 1, the difference is that the cable is a small-diameter two-wire cable; the length of the cable is 10-20 kilometers.

Embodiment 3

[0042] A control method for a remote distributed DC power supply system as described in Embodiments 1 and 2, including the following:

[0043] When the power generation of the distributed power generation module is insufficient, the bidirectional inverter works in the rectification state, and the three-phase AC power grid supplies power to the DC power grid where the remote distributed DC power supply system is located;

[0044] When the power generated by the distributed power generation module exceeds the load demand, the bidirectional inverter works in an inverting state, and the DC grid where the remote distributed DC power supply system is located supplies power to the three-phase AC grid.

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PUM

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Abstract

A remote distributed DC power supply system comprises the components of a cable which is used for a DC bus, a plurality of distributed power generating modules, and distributed load modules, wherein the plurality of distributed power generating modules and the distributed load modules are arranged on the cable. One end of the DC bus is provided with a bidirectional inverter for realizing grid integration. The distributed power generating module is a current type power supply. The system further comprises a control loop for closed loop adjustment among the distributed power generating modules, the distributed load modules and the bidirectional inverter. The remote distributed DC power supply system used in a DC power grid aims at technical problems of distributed equipment in a path, relatively long distance and high difficulty in supplying long-term stable electric power to distributed power consumption facilities, thereby accurately controlling voltage and current of a relatively long DC bus and realizing a stable power grid operation effect.

Description

technical field [0001] The invention relates to a remote distributed DC power supply system and a control method thereof, belonging to the technical field of remote distributed DC power supply. Background technique [0002] Billboards, monitoring, base stations and other facilities on both sides of the expressway need long-term stable power supply. The equipment along the road is scattered and far away, and the power demand of each equipment is small. If it is designed according to the ordinary power grid, the cost is often high. Therefore, the remote distributed DC power supply system can give full play to its characteristics on the expressway and provide long-term stable power for distributed small power facilities. In addition to power consumption nodes, the remote distributed DC power supply system also includes a large number of renewable energy generation nodes and energy storage nodes, such as photovoltaics and wind power. The voltage and current of the 10-20 kilomet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/00H02J1/10H02J3/38
CPCH02J3/383H02J3/386H02J1/00H02J1/10Y02E10/56Y02E10/76
Inventor 王宏王吉武
Owner 山东鼎维数字技术有限公司