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DG grid-connected electric system high acceptance protection method

A high-capacity, power system technology, applied in the direction of AC network circuits, emergency protection circuit devices, electrical components, etc., can solve the problems of power supply customer equipment damage, complicated synchronization process, etc., to achieve strong acceptability, guaranteed benefits, good flexibility

Active Publication Date: 2017-02-15
ZAOZHUANG POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. Running in a DG island will complicate the automatic reclosing and the synchronization process that requires the generator / load (island) to the power supply system during manual switching
[0005] 2. Power quality (voltage, frequency and harmonics) usually cannot be maintained at an acceptable level during DG island operation, which will cause damage to power supply customer equipment

Method used

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  • DG grid-connected electric system high acceptance protection method
  • DG grid-connected electric system high acceptance protection method
  • DG grid-connected electric system high acceptance protection method

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0033] 1DG and basic principles

[0034] 1.1 DG standard setting principle

[0035] In trying to promote the DG grid-connection standards and guidelines, the power system has tried many times to implement the DG "standard" grid-connection protection requirements. The main methods are as follows:

[0036] A. Classify the types of DG generators: various types of DG generators can be divided into three categories:

[0037] 1) Synchronous generator: including engine, gas turbine and small hydropower

[0038] 2) Induction generators: mainly wind turbines

[0039] 3) Asynchronous generators: including microturbines, fuel cells and photovoltaics.

[0040] These generator types have different electrical characteristics and therefore different interconnection protection requirements. The most common type of DG by far is the synchronous generator.

[0041]...

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PUM

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Abstract

The invention discloses a DG grid-connected electric system high acceptance protection method, which comprises the following steps: when a line has fault, carrying out corresponding protection actions according to whether a grid-connected DG system side grid-connection line is provided with longitudinal differential protection; when the grid-connected DG system side grid-connection line is provided with the longitudinal differential protection, and the line has fault, carrying out line protection action to trip off a line system side circuit breaker, and intertrip off a grid-connection line switch; and when the grid-connected DG system side grid-connection line is not provided with the longitudinal differential protection, and the line has fault, carrying out line protection action to trip off the line system side circuit breaker, and carrying out main transformer high standby zero-sequence overvoltage protection to trip off a transformer high-voltage side switch and intertrip off the DG grid-connection line switch. The DG grid-connected electric system high acceptance protection method is good in flexibility and high in acceptance, can ensure safe and reliable operation of the system, and can ensure benefit of DG service providers to the largest degree.

Description

technical field [0001] The invention relates to a high capacity protection method for a grid-connected power system based on DG. Background technique [0002] With the rapid development of smart grid today, it is predicted that more and more new power generation construction will be completed by IPP (Independent Power Producer) in the future. Many decentralized units will be connected to the grid in smaller industrial and commercial facilities, and the energy consumption of local loads will be reduced by sharing or "peak shaving". At the same time, it also makes the management of distributed power supply the focus of attention of all parties. [0003] Most distributed generation units (hereinafter referred to as "DG") are usually connected to the distribution network and substation of the power supply system through intermediate equipment. However, these power grids were designed according to the radial power supply network at the beginning of the design, and did not take ...

Claims

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Application Information

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IPC IPC(8): H02H7/26H02J3/38
CPCH02H7/26H02H7/267H02J3/381H02J3/388
Inventor 林霞李可孔令元李崭廉震冯相军王祥军刘朋万卫东种法超李强胡太元王龙石磊时永田凤字揭一鸣韩松崔岩王婷婷张琳张立卓江海旗高常德王抒阅李扬王金凤于华陈珊孟庆红李瑶朱新颖张英彬王群薛会
Owner ZAOZHUANG POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER