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Method and device for networked protection of microgrid

A technology of microgrid and power grid, applied in emergency protection circuit devices, circuit devices, electrical components, etc., can solve the problems of high investment in protection equipment, expanding the scope of accident impact, poor protection ability, etc., to improve protection efficiency and ensure safety and stability. The effect of running, reducing stress

Active Publication Date: 2013-10-16
CHINA ENERGY ENG GRP GUANGDONG ELECTRIC POWER DESIGN INST CO LTD +1
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Problems solved by technology

[0009] One of the purposes of the present invention is to provide a networked protection method for microgrids in order to overcome the shortcomings of the prior art, such as high investment in protection equipment, poor protection capabilities, and easy expansion of the scope of accidents. The method requires less investment and can Improve the reliability of the protection system and make the protection performance more stable

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  • Method and device for networked protection of microgrid
  • Method and device for networked protection of microgrid
  • Method and device for networked protection of microgrid

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Embodiment Construction

[0059] The present invention will be further described below in conjunction with the accompanying drawings.

[0060] like figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 and Image 6 A microgrid network protection device shown includes a monitoring protection layer 1, an interval layer 2 and a process layer 3; the monitoring protection layer 1 is composed of a protection control host; the interval layer 2 includes several intelligent electronic units IED, and the intelligent electronic The unit IED has the electrical structure of information collection, fault detection and execution, information exchange with the protection control host and issuing trip commands to the circuit breaker; process layer 3 includes bay switches, circuit breakers, voltage transformer EVT and current transformer ECT; bay layer 2 The intelligent electronic unit IED is distributed and set at the input / output ports of the bay switch, circuit breaker, voltage transformer EVT and current tran...

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Abstract

The invention discloses a method and a device for networked protection of a microgrid. Voltage and current information of a line is collected through intelligent electronic devices (IEDs) dispersedly installed on a main transformer, a bus and two sides of a power grid line; a main power grid is judged to break down or not according to a set fault detection method; operating states of the main power grid and the microgrid are monitored continuously when the main power grid is judged to operate normally, a networked monitoring system is put into operation when the main power grid is judged to break down, the intelligent electronic devices (IEDs) first judge a line on which a fault occurs according to fault direction information, and then send fault judgment information to a protection control host. According to the invention, real-time monitoring is carried out on the microgrid by adopting a networked protection system, thereby enabling the microgrid protection to become an organic unity, coordinating with each other, realizing protection for the selectivity, the rapidity, the sensitivity and the reliability of the microgrid, ensuring safe and stable operation of the microgrid system, and improving the utilization rate and the reliability of distributed generation (DG).

Description

technical field [0001] The invention relates to a networked protection method and device for a microgrid. It belongs to the field of microgrid protection. Background technique [0002] Microgrid is a very important part of smart grid. It is composed of distributed power supply DG, load and power transmission and distribution system. It can operate independently or in parallel with the large power grid. It has the function of coordinating and optimizing internal power supply and load control. micro power system. [0003] Since the microgrid has multiple sub-microgrids, distributed power sources DG and loads, the short-circuit current capabilities provided by different types of distributed power sources DG are related to their control strategies. The different contributions of distributed power sources DG to short-circuit current make the protection setting calculation more accurate. The power flow is two-way flow, and the short-circuit current is different in network mode a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/28H02J13/00
CPCY04S10/18Y02E60/724Y02E60/00
Inventor 张寅怀谭茂强张雪焱鲁丽娟谷新梅邓长虹黄文涛莫言君其他发明人请求不公开姓名
Owner CHINA ENERGY ENG GRP GUANGDONG ELECTRIC POWER DESIGN INST CO LTD
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