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Ground fault fully compensated controllable voltage source output voltage computing method

A ground fault and voltage source technology, applied in the field of power transmission and transformation, can solve problems such as difficult arc extinguishing, and achieve the effect of easy control and effective compensation of fault current

Inactive Publication Date: 2018-12-21
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology

[0004] The purpose of this application is to provide a method for calculating the output voltage of a controllable voltage source with full compensation for ground faults, so as to solve the problem in the prior art that the current source is connected to the neutral point for compensation and the arc is difficult to extinguish.

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  • Ground fault fully compensated controllable voltage source output voltage computing method
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  • Ground fault fully compensated controllable voltage source output voltage computing method

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Embodiment Construction

[0021] refer to figure 1 , the embodiment of the present application provides a method for calculating the output voltage of a controllable voltage source with full ground fault compensation, including:

[0022] Step S1. Obtain the line-to-ground capacitance C when a ground fault occurs 0 , leakage resistance R 0 , fault grounding resistance R f , arc suppression coil inductance L, resistance R L and the internal resistance r of the controllable voltage source;

[0023] Step S2, according to the arc suppression coil inductance L, the resistance R L , the leakage resistance R 0 and the line-to-ground capacitance C 0 , calculate the parallel impedance Z of line-to-ground parameters and compensation inductance parameters 1 ;

[0024] Step S3, according to the fault grounding resistance R f , the internal resistance r of the controllable voltage source and the parallel impedance Z of the line-to-ground parameter and the compensation inductance parameter 1 , to calculate ...

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Abstract

The invention discloses a ground fault fully compensated controllable voltage source output voltage computing method, comprising the steps of obtaining circuit ground capacitance, leakage resistance,fault ground resistance, arc suppression coil inductance, resistance and controllable voltage source internal resistance when a ground fault occurs; computing parallel impedance of a circuit ground parameter and a compensation inductance parameter according to the arc suppression coil inductance, the resistance, the leakage resistance and the circuit ground capacitance; and computing a controllable voltage source output voltage according to the fault ground resistance, the controllable voltage source internal resistance and the parallel impedance of the circuit ground parameter and the compensation inductance parameter. According to the method, in a voltage source access mode, the state problem that an arc suppression coil inductance parameter and the circuit ground capacitance approximateto power frequency resonance does not need to be taken into consideration; control is relatively easy; a fault current can be effectively compensated; and arc quenching is carried out on a fault point. According to the method, phase and amplitude of the output voltage are obtained through computing, the current at the fault point is quenched through control over the phase and amplitude of a controllable voltage source, and safe and stable operation of a power grid is ensured.

Description

technical field [0001] The present application relates to the technical field of power transmission and transformation, in particular to a method for calculating the output voltage of a controllable voltage source with full compensation for ground faults. Background technique [0002] The medium-voltage distribution network generally adopts the low-current grounding method (the neutral point is not grounded or grounded through the arc suppression coil). The operation mode in which the neutral point is grounded through the arc suppression coil is also called resonance grounding. When a single-phase ground fault occurs, the capacitive current at the fault point can be compensated by the inductive current generated by the inductance coil connected between the neutral point and the ground. Extinguish the arc at the fault point. However, the arc suppression coil can only compensate the capacitive current, not the active current. Moreover, in order to avoid linear resonance, the ...

Claims

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Application Information

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IPC IPC(8): G01R31/02G01R31/08G06F17/50
CPCG01R31/086G01R31/50G06F30/20
Inventor 刘红文何乐为王科杨庆
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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