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A method for actively withdrawing from arc suppression coil with active power injection and full compensation

An arc suppressing coil, active technology, applied in emergency protection circuit devices for limiting overcurrent/overvoltage, emergency treatment AC circuit layout, emergency protection circuit devices, etc., to achieve the effect of suppressing resonance and ensuring timely exit from operation

Active Publication Date: 2022-04-08
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this invention also cannot realize the active withdrawal of the arc suppressing coil after the full compensation of the grounding wire fault, and cannot solve the above technical problems

Method used

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  • A method for actively withdrawing from arc suppression coil with active power injection and full compensation
  • A method for actively withdrawing from arc suppression coil with active power injection and full compensation
  • A method for actively withdrawing from arc suppression coil with active power injection and full compensation

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A method for actively withdrawing from an active power injection fully compensated arc suppression coil, comprising the following steps:

[0049] S1: In the process of ground residual current compensation, by controlling the single-phase voltage source inverter to inject additional periodic active current with variable amplitude to the neutral point, it is equivalent to adding damping resistance R in the parallel resonant circuit s , used to suppress the resonance between the damping arc suppression coil and the capacitor, and realize the rapid exit of the active full compensation arc suppression coil after the ground fault is restored;

[0050] S2: Establish the equivalent model of the zero-sequence current path after the ground fault recovery of the distribution network;

[0051] S3: Through the equivalent model of the zero-sequence current path in S2, establish the relationship between the zero-sequence voltage drop amplitude and time;

[0052] S4: The injected acti...

Embodiment 2

[0078] The active power injection full-compensation arc suppressing coil active withdrawal method of the embodiment of the present invention differs from the first embodiment in that:

[0079] In S1, the grounding residual current compensation process is as follows: the residual current full compensation device is mainly composed of a master-slave arc suppression coil and a single-phase inverter. The arc-suppression coil uses an automatic turn-adjusting arc-suppression coil as the main arc-suppression coil, and the controllable part of the single-phase inverter as the slave arc-suppression coil. The main arc-suppression coil compensates most of the fundamental ground current, and the compensation current is generated from the arc-suppression coil through the single-phase inverter by using PWM control technology. As a beneficial supplement to the main arc-suppression coil, it compensates for the remaining fundamental ground current harmonic components in .

[0080] When the di...

example

[0133] Taking the 10kV distribution network with three-circuit outlet system as an example, the system design is carried out.

[0134] (1) Calculation of ground capacitance

[0135] After considering the single-phase grounding, the grounding current is 60A, then the calculated value of the capacitance can be

[0136]

[0137] (2) Calculation of the inductance value of the main arc suppression coil

[0138] According to the parallel resonance theory of inductors and capacitors, the theoretical inductance value can be obtained as:

[0139]

[0140] In practice, the main arc suppression coil is generally in an overcompensated state, that is, the detuning degree γ<0, according to the calculation formula of the detuning degree:

[0141]

[0142] For different degrees of detuning there are:

[0143]

[0144] From this, the formula for calculating the overcompensation inductance value is:

[0145]

[0146] (3) Calculation of line grounding resistance

[0147] The ...

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Abstract

The invention discloses a method for actively withdrawing active power injection fully compensated arc suppressing coils, and belongs to the technical field of power distribution fault maintenance. In the process of ground residual compensation, by controlling the single-phase voltage source inverter to inject additional periodic active current with variable amplitude into the neutral point, it is equivalent to adding damping resistance in the parallel resonant circuit R s , which is used to damp the resonance between the arc suppression coil and the capacitor, and realize the rapid exit of the active full compensation arc suppression coil after the ground fault is restored; establish the equivalent model of the zero-sequence current path after the ground fault recovery of the distribution network; through the zero-sequence current path The equivalent model establishes the relationship between the amplitude of the zero-sequence voltage drop and time; the injected active current decreases with the drop of the zero-sequence voltage, and the neutral point voltage drops below the threshold to control the single-phase voltage source inverter to stop running. Therefore, the present invention can realize the active withdrawal of the arc suppression coil after the fault of the ground wire is fully compensated.

Description

technical field [0001] The invention relates to the technical field of power distribution fault maintenance, in particular to a method for actively withdrawing active power injection fully compensated arc suppression coils. Background technique [0002] With the increasing capacity of urban distribution network and the large increase of nonlinear loads and cable lines, while the magnitude of the ground fault current is increasing, the residual current component it contains is also greatly increasing, while the traditional arc suppressing coil The active component and harmonic component in the ground fault current cannot be compensated, which makes it difficult to control the ground residual current within the specified range. A large residual current will cause the arc to be unable to be extinguished in time, which seriously threatens the safe operation of the power grid and also poses a huge threat to personal safety. Therefore, active arc suppression based on full compensa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00H02H9/08
CPCH02J3/001H02H9/08
Inventor 王鹏冯光徐铭铭张建宾陈明董轩王磊孙芊赵健李丰君
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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