Adaptive current protection method for power distribution network including high-permeability distributed power supply

A technology of distributed power supply and high penetration rate, which is applied in the direction of emergency protection circuit devices, electrical components, etc., and can solve problems affecting the reliability of the power system, current protection misoperation, and refusal to operate

Active Publication Date: 2016-01-06
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Based on the above analysis, the existing current protection setting method cannot be applied to the situation where high-penetration distributed power sources are connected to the distribution network, which may cause misoperation and refusal of current protection, seriously affecting the reliability of the power system. sex

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  • Adaptive current protection method for power distribution network including high-permeability distributed power supply
  • Adaptive current protection method for power distribution network including high-permeability distributed power supply
  • Adaptive current protection method for power distribution network including high-permeability distributed power supply

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Embodiment Construction

[0049] Below in conjunction with accompanying drawing, implementation process of the present invention is described in further detail:

[0050] The invention is an adaptive current protection method for a high-permeability distributed power source connected to a distribution network, which specifically includes the following steps:

[0051] in such as figure 1 In the typical distribution network system shown, the Thevenin equivalent of the system power supply and the distributed power supply is the form of the ideal power supply series equivalent impedance, where S1 is the system power supply, Zs is the system equivalent impedance; S DG is a distributed power supply, Z DG It is the equivalent impedance of the distributed power supply; the lines AB, BC, CD, AD, and DE are all transmission lines with a length of 10km, the line resistance r1=0.138Ω / km, and the line reactance x1=0.369Ω / km. The rated power of loads on busbars B and D is 0.95MVA, and the rated power of loads on bu...

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Abstract

The invention discloses an adaptive current protection method for a power distribution network including a high-permeability distributed power supply. The method comprises the following steps: performing Thevenin equivalence on the distributed power supply; acquiring current and voltage information of a distributed power supply grid connection point; calculating an equivalent impedance of the distributed power supply in real time through fault current and voltage components of the distributed power supply grid connection point in the case of a fault; and putting the equivalent impedance into a setting valve calculation formula to calculate a protected setting value in real time. Through adoption of the adaptive current protection method, influences on current protection caused by access of the distributed power supply to the power distribution network can be effectively eliminated, and the situation that a protection range of the current protection changes along with the change of an access capacity of the distributed power supply is avoided. The adaptive current protection method has important significance in ensuring correct actions of the current protection under the situation of the power distribution network to which the high-permeability distributed power supply accesses.

Description

technical field [0001] The invention belongs to the field of distribution network current protection, and in particular relates to an adaptive current protection method for a distribution network containing a distributed power supply with high penetration rate. Background technique [0002] As fossil fuel reserves are depleted and global energy demand continues to grow, the prominence of renewable energy continues to rise. Distributed power generation improves the efficiency of clean energy utilization and solves the problem of power supply in remote rural areas through the use of renewable energy such as wind power and solar energy. However, the access of distributed power to the distribution network will change the original single power supply and radial structure characteristics of the power grid, so that the flow of each branch in the distribution network is no longer a unidirectional flow, directly changing the direction and direction of the short-circuit current in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/28
Inventor 徐铭铭雷响荆骁睿周宁马建伟焦在滨
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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