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Low-voltage AC/DC power distribution mode conversion system and sequential control method and device thereof

A mode conversion and timing control technology, which is applied in the direction of circuit devices, emergency protection circuit devices, power network operating system integration, etc., can solve problems that affect the accuracy and reliability of information transmission, easy mutual interference, and wireless communication fading. To ensure the continuity of the user's power supply, improve the voltage qualification rate, and obtain accurate and reliable results

Active Publication Date: 2021-08-17
GUANGDONG POWER GRID CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, wired communication needs to set up another communication line, which is expensive, and the communication line is easily damaged, and operation and maintenance are difficult; different signals of wireless communication are easy to interfere with each other, and wireless communication has the characteristics of fading, which affects the accuracy and reliability of information transmission.

Method used

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  • Low-voltage AC/DC power distribution mode conversion system and sequential control method and device thereof
  • Low-voltage AC/DC power distribution mode conversion system and sequential control method and device thereof
  • Low-voltage AC/DC power distribution mode conversion system and sequential control method and device thereof

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Embodiment Construction

[0042] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0043] It should be understood that the step numbers used in the text are only for the convenience of description, and are not used as a limitation on the order of execution of the steps.

[0044]It should be understood that the terms used in the present specification are only for the purpose of describing particular embodiments and are not intended to limit the present invention. As used in this specification and the appended claims,...

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Abstract

The invention discloses a low-voltage AC / DC power distribution mode conversion system and a sequential control method and device thereof, and relates to the technical field of power transmission and distribution of power systems. The system comprises a distribution power supply, a distribution line, a load, a sending end converter, a receiving end converter and a plurality of circuit breakers. According to the sequential control method of the low-voltage AC / DC power distribution mode conversion system, the states of the current and voltage in a system line are detected, the opening and closing actions of different circuit breakers are controlled, the power supply transmits power to the load through the sending end converter and the receiving end converter, and switching from an alternating current power supply mode to a direct current power supply mode is completed. The switching rapidity and reliability are ensured by determining the switching control scheme of the switches at the two sides by detecting the voltage and current change conditions at the two sides, the alternating-current power distribution mode is smoothly switched to the direct-current power supply mode when the terminal demand power is increased and the voltage drop is obvious, a communication line does not need to be additionally arranged, the cost is low, and the safety of components, such as the converter, etc., and the user power supply continuity can be ensured.

Description

technical field [0001] The invention relates to the technical field of power system power transmission and distribution, in particular to a low-voltage AC-DC power distribution mode conversion system and a method and device for its sequence control. Background technique [0002] With the increasing improvement of people's living standards, household loads are increasingly diversified, refined, and large-capacity. The centralized use of high-power loads makes the voltage drop of long-distance distribution lines obvious, and the problem of voltage drop of end users is prominent. In recent years, with the gradual maturity of power electronic technology, the cost of low-voltage power electronic devices has continued to decline. The application of power electronic technology in low-voltage distribution networks to extend the power supply radius and solve the low-voltage problem of users in remote areas has gradually become more feasible and economical. In order to ensure the cost...

Claims

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Application Information

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IPC IPC(8): H02J13/00H02J3/36H02H7/26H02J9/06
CPCH02J13/00022H02J13/0004H02J3/36H02H7/26H02J9/062Y04S10/20Y04S20/248Y04S20/12Y04S40/126Y02E60/60Y02E60/00Y02B70/30Y02B90/20
Inventor 金莉雷二涛马凯谭令其李歆蔚李盈岳菁鹏马燕君王晓毛黄辉王庆斌
Owner GUANGDONG POWER GRID CO LTD
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