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Fault positioning method used for power distribution network and comprising multiple T-connection inversion distributive power sources

An inverter-type distributed and distributed power source technology, applied in the fault location, detecting faults according to conductor types, etc., can solve the problem that the voltage of the grid connection point cannot be easily obtained, the distribution network fault location method is no longer applicable, and the fault current distribution is solved. difficulties, etc.

Active Publication Date: 2017-08-18
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the event of a fault, the IIDG output current is related to the IIDG capacity, current output, fault type and fault location, which will make the traditional distribution network fault location method no longer applicable
Especially when the IIDGs are distributed into the feeder, even if the IIDGs can be equivalent to a voltage-controlled current source, the voltage at the grid-connected point cannot be easily obtained, so it is difficult to solve the fault current distribution

Method used

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  • Fault positioning method used for power distribution network and comprising multiple T-connection inversion distributive power sources
  • Fault positioning method used for power distribution network and comprising multiple T-connection inversion distributive power sources
  • Fault positioning method used for power distribution network and comprising multiple T-connection inversion distributive power sources

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Embodiment

[0059] This embodiment takes figure 1 Take the 10kV neutral point ungrounded simple distribution network as an example, the system reference capacity is 500MVA, the reference voltage is 10.5kV, and the system impedance value is x s = 0.126Ω. The lines are all overhead lines, and their line parameters are x 1 = 0.347Ω / km, r 1 = 0.27Ω / km. Feeder 1 has 4 inverter-type distributed power sources connected, and the feeder is divided into 4 sections, the length of each section is 0.8km, 1km, 2km, 3km; feeder 2 has only one inverter-type distributed power supply connected , whose length is 4 km. The capacities of IIDG1~IIDG5 are 2MW, 2MW, 1MW, 1.5MW and 1.2MW respectively, and the output of each IIDG during normal operation is 1.8MW, 1.5MW, 1MW, 1.5MW and 1.2MW respectively. Load 1 is 7MW, load 2 is 4MW, and the power factor is 0.9.

[0060] Using PSCAD / EMTDC simulation software to simulate and analyze the system, in the feeder internal fault criterion, k rel is 1.2, and ar...

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Abstract

The invention discloses a fault positioning method used for a power distribution network and comprising multiple T-connection inversion distributive power sources. The method includes steps of electrifying a relay protection device; initiating circuit parameters; acquiring power of the distributive power sources; acquiring voltage phasor and current phasor on two sides of a feed line; calculating output current of the distributive power sources; calculating the magnitudes of comparison voltage on two sides of the feed line; if the comparison voltage is greater than a setting value, determining faults within a feed line zone and starting a fault positioning algorithm; if the faults occur in a specific section, calculating a measurement distance percentage, and determining the faults within the section if the measurement distance percentage is smaller than 100%. By adopting the method, problems in relay protection and fault positioning when the multiple distributive power sources are in T-connection with the circuit can be solved effectively. Besides, the method is insusceptible to influence by connection number and connection position of the distributive power sources, fault types and transition resistors, and is high in adaptability and engineering practicality.

Description

technical field [0001] The invention relates to the field of relay protection of power systems, in particular to a fault location method for a distributed power distribution network with multiple T-connection inverters. Background technique [0002] Fault zone location in distribution network is the premise to realize effective isolation of fault zone and fast restoration of power supply, and plays an important role in ensuring power supply quality and improving system reliability. As more and more distributed power sources are connected to the medium and low voltage distribution network, the structure of the power distribution system has undergone fundamental changes, from a single power system to a multi-power system, and fast fault location will be more complicated. In addition, because the distributed power supply has a flexible and convenient control mode, if the faulty section can be effectively isolated, the distributed power supply can continue to supply power to oth...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/086
Inventor 马燕君王钢韩博文谢秋霞李海锋
Owner SOUTH CHINA UNIV OF TECH
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