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Grounding state identification and arc suppression coil control method for mixed connection ground operation of distribution network

A technology of arc suppressing coil and grounding state, which is applied in the field of neutral point grounding of distribution network, which can solve the problems of increasing capacitance current to ground, increasing tuning range, increasing mechanical system of arc suppressing coil, etc., so as to reduce loss part, Reduce the loss of mechanical parts, the effect of novel ideas

Active Publication Date: 2018-11-20
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention: Aiming at the simultaneous use of arc suppressing coils and resistors in parallel for hybrid grounding in the power distribution network, the ground capacitive current will increase sharply, and the tuning range will increase after the hybrid parallel connection, which will further increase the wear and tear of the arc suppressing coil mechanical system Problem, the present invention provides a method for identifying the grounding state of the mixed-connected ground operation of the distribution network, which identifies the state of the distribution network according to the electrical parameters collected from the power grid, and can accurately identify the grounded state of the mixed-connected grounding system of the distribution network. The method is novel in concept, The process is clear, the operation is simple, and the practicability is strong, which fills the gap in the identification of the grounding mode of the domestic power distribution network; furthermore, the present invention also provides a method for controlling the arc suppression coil of the distribution network hybrid connection grounding system, which can obtain the distribution network hybrid connection On the basis of the grounding state of the grounding system, the arc suppression coil is adjusted and controlled, and the mixed parallel grounding method can be pre-warned, which can reduce the mechanical wear of the arc suppression coil, timely control the arc suppression coil to be in a static state, and prolong the arc suppression coil. The service life can reduce the loss of the mechanical part of the arc suppression coil, and can reduce the probability of accidents due to the increase of ground capacitance

Method used

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  • Grounding state identification and arc suppression coil control method for mixed connection ground operation of distribution network
  • Grounding state identification and arc suppression coil control method for mixed connection ground operation of distribution network
  • Grounding state identification and arc suppression coil control method for mixed connection ground operation of distribution network

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Embodiment 1

[0038] Such as figure 1 As shown, in this embodiment, the implementation steps of the method for identifying the grounding state of the mixed-connection operation of the distribution network include:

[0039] 1) Measure the output voltage U of the distribution network o and the inductor branch current I L , the inductor branch current I L Specifically, it refers to the current flowing through the arc suppression coil in the distribution network hybrid connection grounding system. The distribution network hybrid connection grounding system includes parallel arc suppression coils and resistors; due to the large voltage and current of the distribution network, it is suitable to use voltage and current transformers, synchronous Obtain the inductive current and output voltage of the power system, and at the same time, the high voltage and high current can well overcome the nonlinearity of the transformer, so that the voltage and current can be converted more accurately;

[0040]...

Embodiment 2

[0061] This embodiment is basically the same as Embodiment 1, and the main difference is that the capacitance Z of the distribution network is calculated in step 2). C The function expression of is different, in the present embodiment, calculate the capacitive reactance Z of distribution network in step 2) C The function expression of is shown in formula (1-1);

[0062]

[0063] In formula (1-1), Z C Indicates the capacitive reactance of the distribution network, the arc suppression coil gear includes gear 1 and gear 2, U o1 Indicates the neutral point displacement voltage when the arc suppression coil is in gear 1, U o2 Indicates the neutral point displacement voltage when the arc suppression coil is in gear 2, e indicates the unbalanced voltage of the distribution network, i L1 Indicates the arc suppression coil current when the arc suppression coil is in gear 1, i L2 Indicates the arc suppression coil current when the arc suppression coil is in gear 2. The function ...

Embodiment 3

[0065] This embodiment is basically the same as Embodiment 1. The main difference is that the function expression of step 3) to calculate the detuning degree v of the arc suppression coil in the grounded hybrid system is different. In this embodiment, step 3) calculates the grounded hybrid system. The functional expression of the detuning degree v of the arc suppression coil in the system is shown in formula (2-1);

[0066]

[0067] In formula (2-1), v represents the detuning degree of the arc suppression coil in the grounded hybrid system, and the arc suppression coil stalls include stall 1 and stall 2, U o1 Indicates the neutral point displacement voltage when the arc suppression coil is in gear 1, U o2 Indicates the neutral point displacement voltage when the arc suppression coil is in gear 2, e indicates the unbalanced voltage of the distribution network, i L1 Indicates the arc suppression coil current when the arc suppression coil is in gear 1, i L2 Indicates the arc...

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Abstract

The invention discloses a method for grounding state recognition and arc suppression coil control in hybrid grounding operation of a power distribution network. By adoption of the method for grounding state recognition, power distribution network states are recognized according to power grid acquired electrical parameters, and grounding states of a hybrid grounding system of the power distribution network can be recognized accurately. The method is novel in conception, clear in process, simple in operation and high in practicality and fills a gap in recognition of domestic power distribution network grounding modes. By adoption of the method for arc suppression coil control, arc suppression coil adjustment and control can be realized on the basis of the acquired grounding states of the hybrid grounding system of the power distribution network, early warning processing of a hybrid parallel grounding mode can be realized, mechanical abrasion of arc suppression coils can be reduced, the arc suppression coils are timely controlled to be in a static state, and accordingly service lives of the arc suppression coils are prolonged, mechanical loss of the arc suppression coils can be reduced, and probability of accident occurrence caused by increase of ground capacitance can be reduced as well.

Description

technical field [0001] The invention relates to a neutral point grounding technology of a distribution network, in particular to a grounding state identification and an arc-suppression coil control method for a mixed connection operation of a distribution network. Background technique [0002] At present, my country's urban distribution network mainly adopts the grounding method of the neutral point through the arc suppression coil. However, with the increase of urbanization scale and the increase of cable consumption, the capacitive current increases rapidly, so many substations choose to adopt the resistance grounding method. Usually these two grounding methods operate independently and independently of each other. However, due to the requirements for power supply reliability, in order to ensure the power supply reliability index, many places have adopted hand-in-hand power supply measures to ensure that when a substation loses voltage for some reason, the contact circuit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/08G01R31/00
CPCG01R31/003H02H9/08
Inventor 任章鳌汪霄飞李欣
Owner STATE GRID CORP OF CHINA