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Novel substation direct-current system and reliable power supply method

A technology of DC system and power supply method, applied in the direction of DC power supply parallel operation, DC network circuit device, battery circuit device, etc., which can solve the problems of DC load power failure, low reliability, and failure to operate normally

Pending Publication Date: 2021-04-23
STATE GRID FUJIAN ELECTRIC POWER CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above DC system topology still has the following problems: 1) When a battery in the series fails, the entire battery pack will fail and cannot operate normally; 2) Once the DC cable feeder fails and the line is disconnected, it may cause a large area 3) When one of the batteries fails, the DC load powered by it will lose power. Although the DC load transfer can be realized by closing the DC bus tie switch, only The power can be restarted after the DC bus tie switch is closed. During the switching process, the important DC loads in the substation are still in a power-off state for a period of time, and the reliability is not high.

Method used

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  • Novel substation direct-current system and reliable power supply method
  • Novel substation direct-current system and reliable power supply method
  • Novel substation direct-current system and reliable power supply method

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0032] It should be pointed out that the following detailed description is exemplary and is intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0033] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combina...

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Abstract

The invention provides a novel substation direct-current system and a reliable power supply method; the novel substation direct-current system comprises more than one control cabinet, each control cabinet is internally provided with a direct current subsystem, and the direct current subsystem comprises a hybrid energy storage system and a direct current load; the hybrid energy storage system comprises a super capacitor and a lithium battery. The super capacitor supplies power to short-time high-power loads including opening and closing, and the lithium battery supplies power to other stable direct-current loads. The power supply reliability of the substation direct-current system can be effectively improved, the service life of the storage battery is prolonged, the substation modularization level is improved, and the occupied area of the substation is further saved.

Description

technical field [0001] The invention relates to the field of power system safety design, in particular to a novel substation DC system and a reliable power supply method. Background technique [0002] The DC system composed of DC power supplies plays an important role in the safe and stable operation of substations and even the entire power system. In recent years, there have been many accidents in the power system that caused the power outage of the whole station due to the DC system, and even further caused the power outage of the regional power system. At present, the DC system of the substation usually adopts the method of connecting valve-regulated lead-acid batteries in series to supply power to the DC bus. With the popularization of unattended substations and the substantial improvement of the automation of substation systems, higher requirements are put forward for the safety and reliability of DC power supplies. . [0003] At present, the DC system topology common...

Claims

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Application Information

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IPC IPC(8): H02J1/10H02J7/34H02J1/14
CPCH02J1/10H02J1/109H02J7/345H02J1/14
Inventor 张成炜王亮陈罕筠张娜
Owner STATE GRID FUJIAN ELECTRIC POWER CO LTD
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