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Micro-grid protection method

A microgrid and differential protection technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of the reliability impact of the action of the delay synchronization performance protection device, the complex communication network of the microgrid differential protection, etc.

Inactive Publication Date: 2017-01-18
YANGZHOU KEYU ELECTRICITY
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Problems solved by technology

Differential protection relies on communication devices to transmit electrical quantities and status information at both ends of the line. With the increase of micro-grid nodes, the micro-grid differential protection communication network tends to become more complex, and the delay synchronization performance of the communication network is important for the reliability of the protection device action. Sex will have a greater impact

Method used

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Embodiment Construction

[0028] A microgrid protection method, comprising the following steps:

[0029] Step 1. Construction of the microgrid line differential protection model with communication delay;

[0030] Step 2, research on communication delay detection technology;

[0031] Step 3. Establishment of an information model of a microgrid line differential protection device based on IEC61850.

[0032] The construction of the microgrid line differential protection model with communication delay in the above step 1, specific steps

[0033] include:

[0034] Step 1. Construction of the microgrid differential protection model, so that the microgrid can smoothly switch between island operation and grid-connected operation;

[0035] Step 2. Improvement of the differential protection algorithm, introducing a third-order dynamic time warping algorithm into the traditional differential protection algorithm;

[0036] Step 3. The establishment of the communication delay evaluation index, using the method ...

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Abstract

The invention discloses a micro-grid protection method which is applied to the technical field of an electric power system and comprises the following steps: 1) establishing a micro-grid line differential protection model in communication delay; 2) conducting research on the detection technology in communication delay; and 3) establishing an information model based on the IEC61850 micro-grid line differential protection system. According to the first step of establishing a micro-grid line differential protection model in communication delay, a micro-grid line differential protection model is established so that the micro-grid can switch smoothly between the islanding operation mode and the grid connection operation mode. In step 2, the differential protection algorithm is improved by the introduction of a third-order dynamic time warping algorithm into the traditional differential protection algorithm. In step 3, the establishment of communication delay evaluation indexes and the use of a multi-interval optimization method protect the seeking problem of critical dimension in communication network delay. The invention has the communication delay compensation function, and achieves high reliability and strong compatibility.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a method for protecting a micro-grid. Background technique [0002] At present, the microgrid has become a hot spot widely concerned by researchers at home and abroad. Microgrid is a small power generation and distribution system composed of distributed power sources, energy conversion devices, loads, monitoring and protection devices, etc., which can realize the functions of self-control and management. When distributed power is connected to the microgrid, its power fluctuation, bidirectional power flow, and the change of transient characteristics caused by the change of system inertia after the introduction of converter equipment make the change of electrical quantity after a fault very complicated. Traditional distribution network The current quick-break relay protection can no longer meet the needs of micro-grid relay protection. Therefore, the differential protection...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
CPCH02H7/263
Inventor 王博谷昌瑞朱善俊
Owner YANGZHOU KEYU ELECTRICITY
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