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A Method of Improving the Reliability of Relay Protection of Distribution Network Containing Distributed Power

A technology of distributed power supply and relay protection, applied in the direction of automatic disconnection emergency protection device, emergency protection circuit device, electrical components, etc. , the effect of increasing the penetration rate

Active Publication Date: 2019-07-12
STATE GRID LIAONING ELECTRIC POWER RES INST +3
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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for improving the reliability of relay protection of distribution network with distributed power, so as to solve the problem that the reliability of relay protection is reduced after distributed power with different capacities is connected to the distribution network

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  • A Method of Improving the Reliability of Relay Protection of Distribution Network Containing Distributed Power
  • A Method of Improving the Reliability of Relay Protection of Distribution Network Containing Distributed Power
  • A Method of Improving the Reliability of Relay Protection of Distribution Network Containing Distributed Power

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Embodiment Construction

[0025] The specific implementation manners proposed by the present invention will be further described below in conjunction with the above-mentioned drawings.

[0026] A method for improving the reliability of distribution network relay protection with distributed power sources provided by the present invention comprises the following steps:

[0027] (1) A data analysis module is implanted in the internal memory of the relay protection device in advance. This data analysis module includes the maximum DR that is allowed to be connected to the distribution network when the protection device can operate correctly when the most serious fault occurs in the protection element of the relay protection device. The capacity value, and the current value calculated by the logic of the protected element at this time, the above values ​​can be calculated according to the location of the DR connected to the distribution network, the DR operating condition data and the topology of the distribu...

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Abstract

The present invention provides a method for improving power distribution network relay protection reliability of distributed resources. A data analysis module is implanted in a protection device in advance and comprises capacity value allowed to access DR (Distributed Resources) and logic calculation current value of the protected elements when a relay protection device can perform normal motion when protected elements have the most serious faults; and the relay protection device is configured to receive a capacity value of the DR accessing the power distribution network in real time and compare the capacity value with the capacity value allowed to access the DR to determine a calculation current value which can be employed by the reliable motion of the protection device when the elements have short circuit so as to realize a final reliable motion. The method for improving power distribution network relay protection reliability of the distributed resources facilitates the maximized utilization of the DR, improves the permeability of the DR accessing the power distribution network and reduces the influence on the power distribution network system caused by accessing and the dependence on a traditional generation mode; and in the condition without frequently deblocking and blocking and regulating the capacity of the DR accessing the power distribution network, the problem is solved that the reliability of the relay protection device is reduced because of continuous changing of the capacity of the DR accessing the power distribution network.

Description

technical field [0001] The invention relates to a method for improving the reliability of relay protection of a distribution network with distributed power sources, and belongs to the technical field of relay protection of electric power systems. Background technique [0002] With the sharp decline of fossil energy and the emergence of severe environmental protection issues, the development and utilization of clean and renewable energy has attracted widespread attention worldwide. The development and large-scale promotion of applications provides new opportunities. [0003] At present, DR mostly appears in the form of photovoltaic power generation, wind power generation, energy storage devices, or electric vehicles. While its output power meets the needs of nearby loads, the surplus is often input into the distribution network through power conversion devices. Due to the influence of weather and other factors, DR output power often has the characteristics of randomness, vol...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/28H02H3/05
CPCH02H3/05H02H7/28
Inventor 葛维春易永辉席亚克时谊赵宝陶永健雷俊王雷涛崔路张坤陈旭波黄绍辉闫凯于同伟
Owner STATE GRID LIAONING ELECTRIC POWER RES INST
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