Microgrid integrated relay protection method suitable for grid-connected operation and isolated island operation

A relay protection and micro-grid technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of misoperation or refusal of the original protection device, and no longer meeting the operating conditions.

Active Publication Date: 2015-06-17
TONGJI UNIV +1
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Problems solved by technology

[0004] However, after the microgrid is connected to the grid, its boosting or sinking effect affects the magnitude and direction of the fault current in the original distribution network, making the setting value of the original relay protection device in the distribution system no longer meet the operating conditions, which may cause the original protection Misoperation or refusal of the device to cause more serious accidents

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  • Microgrid integrated relay protection method suitable for grid-connected operation and isolated island operation
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  • Microgrid integrated relay protection method suitable for grid-connected operation and isolated island operation

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Embodiment Construction

[0020] Please refer to the accompanying drawings below for further description of the present invention.

[0021] Refer to microgrid system figure 1 , the concrete technical scheme of the present invention is as follows:

[0022] Such as figure 1 Shown is the structure diagram of the micro-grid system of the present invention, which consists of a micro-power source (which can be a micro-power source such as photovoltaics and fans, or an energy storage device), two loads, four feeders, four protection devices, and four busbar nodes , B1 is the protection at the common connection point, B2, B3, B4 are used for line protection.

[0023] 1. When the distribution network outside the microgrid fails, the reverse power flowing from the microgrid to the public grid is detected at the public grid connection point (PCC), and the grid-connected circuit breaker B1 is responsible for disconnecting the microgrid, and the microgrid turns into Island mode of operation.

[0024] 2. When th...

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Abstract

Disclosed is a microgrid integrated relay protection method suitable for grid-connected operation and isolated island operation. When a circuit has a fault under different operation modes of a microgrid, a fault section can be cut off accurately, according to a provided setting method and different relative positions of a micro power source and a protection device, different distance setting methods are adopted, adaptivity is achieved, and the problems of protection failures, maloperation and the like caused by distributed power source output currents are solved. In addition, the method only needs to be slightly modified in a general microcomputer protection program, no additional circuit or device needs to be mounted, cost is low, and great significance in the safety of the microgrid is achieved.

Description

technical field [0001] The invention belongs to the intersecting field of distributed power generation and power system protection, and relates to grid-connection of new energy sources, operation mode and protection of micro-grids, and a novel relay protection method for distribution networks. Background technique [0002] The energy problem is becoming more and more urgent, and the use of new energy such as wind power and solar energy is an important way to solve the energy shortage and achieve sustainable development. [0003] The extensive application of distributed generation energy supply technology helps to utilize clean and renewable energy, but at the same time poses new challenges to the safety and reliability of the power system. Due to the inherent intermittency of distributed energy and power generation technology, there are many problems in the direct connection of distributed energy to the grid, such as power quality, power flow, and coordination of the entire ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
Inventor 金立军蒋苗苗程逸帆张颖瑶魏然张磊周科韩建伟杨乐
Owner TONGJI UNIV
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