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Distributed power supply grid connection access system

A distributed power supply and access system technology, applied to electrical components, circuit devices, AC network circuits, etc., can solve problems such as low power quality, poor system stability, and voltage fluctuations in the system, and achieve high energy utilization and flexible loads Adjustability and the effect of reducing the failure rate

Inactive Publication Date: 2015-02-18
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the DG is connected to the distribution network, due to the power supply at the user end, the distribution law of the steady-state voltage will be changed, causing voltage fluctuations, flicker and other power quality problems, which will lead to low power quality of the system, frequent faults, A series of problems such as troublesome maintenance and poor system stability

Method used

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  • Distributed power supply grid connection access system

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with the accompanying drawings.

[0017] Such as figure 1 As shown, the distributed power grid-connected access system of this embodiment includes a grid-connected inverter 1, a distributed power access control unit 2 connected to the grid-connected inverter 1, and a distributed power access control unit 2 connected to the distributed power access control unit. The mains transformer low-voltage outgoing line control unit 4 between the unit 2 and the mains transformer 3, and the low-voltage reactive power compensation control circuit 5 and the multi-channel low-voltage outgoing line circuit 6 connected to the low-voltage busbar. The low-voltage outgoing line circuit 6 is externally connected to a low-voltage load; The distributed power access control unit 2 is composed of a first isolating switch 21, a first current transformer group 22, a first circuit breaker 23 and a first lightning arrester 24, and ...

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Abstract

The invention discloses a distributed power supply grid connection access system. The distributed power supply grid connection access system comprises a grid connection inverter, a distributed power supply access control unit, a mains supply transformer low-voltage wire outlet control unit, a low-voltage reactive power compensation control circuit and a multi-way low-voltage wire outlet circuit. The distributed power supply access control unit is connected with the grid connection inverter, the mains supply transformer low-voltage wire outlet control unit is connected between the distributed power supply access control unit and a mains supply transformer, and the low-voltage reactive power compensation control circuit and the multi-way low-voltage wire outlet circuit are connected with a low-voltage busbar. By means of conversion of new energy resources, failure rate of the system is decreased, and power quality is improved; the system can serve as a standby power supply to provide electric energy for users requiring uninterrupted power supply, power reliability is guaranteed while electric charge is reduced, and reliability of a power distribution network is improved. In addition, distributed generation is flexible in load regulation capability, only a few seconds are required for starting, and output is adjustable by the hour.

Description

[0001] technical field [0002] The invention relates to the technical field of grid access systems, in particular to a grid-connected access system for distributed power sources. [0003] Background technique [0004] With the increasing shortage of conventional energy supply in our country and the increasing call for environmental protection, the development and utilization of renewable energy has received unprecedented attention. The British government took the lead in proposing the concept of "low-carbon economy" in its 2003 energy white paper. The Chinese government put forward the binding indicators of "energy saving and emission reduction" for the development of "low-carbon economy". The distributed power generation ( distributed generation (DG) technology has been highly valued and developed rapidly by the country. [0005] Distributed generation (DG) refers to: in order to meet the needs of specific users or support the economic operation of the existing distr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/382
Inventor 王琮刘立别长报
Owner STATE GRID CORP OF CHINA
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