Short-circuit current computing method for ring-shaped ship power grid

A technology of short-circuit current and calculation method, which is applied in the direction of measuring current/voltage, measuring electrical variables, measuring devices, etc., can solve the problem of not clearly giving the calculation method of short-circuit current of power distribution network, and unable to meet the development needs of ship power system.

Inactive Publication Date: 2012-10-24
JIANGSU UNIV OF SCI & TECH
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Problems solved by technology

These methods generally use equivalent and approximate methods, which have certain practical significance in engineering practice, but all of them take the dry-fed power grid as the hypothetical calculation object, and do not clearly give the AC regional power distribution network based on the ring bus The calculation method of short-circuit current can no longer meet the development needs of the ship power system

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  • Short-circuit current computing method for ring-shaped ship power grid
  • Short-circuit current computing method for ring-shaped ship power grid
  • Short-circuit current computing method for ring-shaped ship power grid

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Embodiment Construction

[0066] The equivalent principle for calculating the short-circuit current of regional power distribution based on the ring bus is:

[0067] 1) Based on the AC regional power supply network of the ring bus, each power station is connected to the power distribution center (regional power supply board) of each area through the circuit breaker and the ring bus. In the calculation process, the equivalent method of the generator and the motor cannot be copied from the equivalent method in the existing standard, but needs to be modified according to the actual situation.

[0068] 2) For generators, each power station is a relatively independent operating unit, so all generators of the power station can be equivalent at the busbar of each power station. If a short-circuit fault occurs in a power station (the short-circuit point is between the generator and the main bus between rows, power distribution centers at all levels and feeders), each generator of the power station is calculate...

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Abstract

According to the structure characteristic of an alternating current region power supply system of a ring-shaped bus, through improvement on several short circuit computing methods which are widely used in the prior art at home and abroad, the original short circuit current computing method for a tree-shaped power grid is deformed into a short-circuit current computing method suitable for a ring-shaped ship power grid. The method comprises the following steps of: firstly, computing the short-circuit current of a simple grid by a star-network transformation and local equal effect method; and secondly, providing a method in which a line impedance matrix is obtained by a graph theoretic approach and then the short circuit current is calculated. According to the method, the short-circuit current computing method for a ship ring-shaped region power distribution system can be explored, the thermal stability and power stability checkout when types of the equipment are selected can be realized, and the basis can be provided for fault protection when the equipment runs.

Description

technical field [0001] The invention relates to a short-circuit current calculation method for a circular power supply network of a ship's regional power distribution system, and belongs to the field of ship power systems. Background technique [0002] With the increase of the capacity of the ship's power system, the network topology will become more and more complex. The traditional ship's power supply and distribution network has low power supply reliability due to its structural characteristics. All the loads of the large-scale ship power system lose power supply; due to the particularity of the power supply and distribution network topology and its mission of the large-scale ship power system, its network planning, load management, and the reconstruction method of the power supply network in the event of a failure cannot copy the land grid. method, we must give priority to ensuring the power supply of important loads, and the requirements for its rapidity are also very s...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00
Inventor 朱志宇刘维亭黄巧亮张冰魏海峰马继先姜文刚
Owner JIANGSU UNIV OF SCI & TECH
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