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Method for improving relay protection reliability of power distribution network containing distributed power supply

A distributed power supply and relay protection technology, applied in the direction of overcurrent protection, emergency protection circuit devices, electrical components, etc., can solve the problems of distribution network protection influence, protection incorrect action, etc., and achieve feasibility Strong, beneficial to maximize utilization and improve reliability

Pending Publication Date: 2022-03-25
江苏力源电力工程有限公司
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for improving the reliability of distribution network relay protection with distributed power, aiming at solving the problem of accessing distributed power in the distribution network in the prior art, which will affect the distribution network The protection has a greater impact, which may lead to technical problems of incorrect action of the protection

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  • Method for improving relay protection reliability of power distribution network containing distributed power supply
  • Method for improving relay protection reliability of power distribution network containing distributed power supply
  • Method for improving relay protection reliability of power distribution network containing distributed power supply

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Embodiment Construction

[0031] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention. In addition, in the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0032] see Figure 1 to Figure 5 , the present invention provides a method for improving the reliability of distribution network relay protection with distributed power, comprising the following steps:

[0033] S100: Determine the location where the distributed power access point is connected to the distribution network, and connect the relay protection equipment at this location;

[0034] S200: Pre-em...

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Abstract

The invention relates to the technical field of relay protection of a power distribution network of a power system, and particularly discloses a method for improving relay protection reliability of a power distribution network containing a distributed power supply, which comprises the following steps of: determining a position where an access point of the distributed power supply accesses the power distribution network, and connecting relay protection equipment at the position; the method comprises the following steps of: pre-implanting a capacity value of a distributed power supply which is allowed to be accessed to a power distribution network when protection can correctly act when a protected element generates the most serious fault in relay protection equipment, and calculating a current value through logic of the protected element at the moment; and the relay protection equipment receives the capacity value of the distributed power supply accessed to the power distribution network and the current value passing through the protected element at the moment in real time through the power distribution network communication system. The method can meet the requirement that the injection capacity of the distributed power supply is larger and larger, the maximum utilization of the distributed power supply is facilitated, the situation that the reliability of the relay protection device is reduced due to continuous change of the capacity of the distributed power supply connected to the power distribution network is avoided, and the feasibility is high.

Description

technical field [0001] The invention relates to the technical field of relay protection for power system distribution networks, in particular to a method for improving the reliability of relay protection for distribution networks with distributed power sources. Background technique [0002] At present, most of the distribution network systems are single-side power supply and radial networks. The protection configuration is mainly three-stage current protection, that is, current quick-break, time-limited current quick-break and definite time over-current protection. It is also possible to configure only two-stage protection. That is, current quick break and definite time overcurrent protection. [0003] Under this protection configuration, if a distributed power supply (DG) is connected to the distribution network, it will have a greater impact on the protection of the distribution network, which may lead to incorrect action of the protection. In view of this, the present inv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02H3/08
CPCH02H7/26H02H3/08
Inventor 何菲沈伟全思平胡欣卫江春孙雷
Owner 江苏力源电力工程有限公司
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