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Method for locating faults of power distribution network with distributed power supplies

A distributed power supply and distribution network failure technology, applied in the field of power systems, can solve problems such as low accuracy

Active Publication Date: 2014-07-16
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to propose a method for fault location of a distribution network containing distributed power sources, which is characterized in that it comprises the following steps:

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  • Method for locating faults of power distribution network with distributed power supplies
  • Method for locating faults of power distribution network with distributed power supplies
  • Method for locating faults of power distribution network with distributed power supplies

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Embodiment Construction

[0035] A method for locating faults in distribution networks with distributed power sources proposed by the present invention includes the following steps:

[0036] Step 1. Establish the Thevenin equivalent model of distributed power supply and obtain the calculation formula of three-phase impedance matrix;

[0037] Step 2. Inject the fault current into each node and calculate the voltage change value at each power supply;

[0038] Step 3, comparing the difference between the voltage change measurement value and the voltage change calculation value at each power supply, and determining a node in the fault section by searching for the fault current injection point corresponding to the minimum difference;

[0039] Step 4, determining another node of the faulty section can realize faulty section location.

[0040] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings.

[0041] To locate the fault in the distribution network, i...

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Abstract

The invention belongs to the field of power systems and particularly relates to a method for locating faults of a power distribution network with distributed power supplies. According to the method, on the basis of voltage current information measured by synchronous phasor measurement devices or fault recording devices installed on a main power supply and outlets of the distributed power supplies, errors of measured values and calculated values of variations of voltages of the power supplies before and after the faults occur are compared to judge the positions of the faults, and asymmetry of the distributed power supplies, distribution transformers and distribution lines are taken into consideration in the process of solving the calculated values of voltage change. According to the method, only the voltage current information of the outlets of the power supplies needs to be obtained, the state information of a relay protector, a breaker, a switching equipment and the like is not needed, the method has the advantages that less information is needed, the physical significance is definite, the calculation process is simple, and the fault locating accuracy is good; meanwhile, the more the number of the distributed power supplies is, the more the number of connected accesses along the power supplies is, and the less the number of disconnected accesses is; the method is more accurate.

Description

technical field [0001] The invention belongs to the field of electric power systems, and in particular relates to a fault location method for a distribution network containing distributed power sources. Background technique [0002] In the power system, the distribution network is the final link directly facing all levels and types of users, and its operation level directly affects the quality and reliability of power supply on the user side. In recent years, Distributed Generation (DG) technology has developed rapidly. More and more distributed power sources are connected to the distribution network, which reduces carbon emissions, but at the same time makes the distribution network radiated by a single power source. The network has become a multi-terminal power supply network, which brings challenges to the relay protection and fault location of the distribution network. The distribution network fault location methods proposed by scholars at home and abroad mainly include...

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Application Information

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IPC IPC(8): G06F19/00G01R31/08
Inventor 戴志辉
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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