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A controllable voltage source fully compensated ground fault state discrimination method and system

A ground fault and state discrimination technology, applied in the directions of fault location, reactive power compensation, reactive power adjustment/elimination/compensation, etc., can solve problems such as inability to judge faults, and achieve strong practicability, accurate calculation, and simple implementation methods Effect

Active Publication Date: 2021-05-18
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] This application provides a method for judging the state of a ground fault with full compensation of a controllable voltage source to solve the problem that after the controllable voltage source is fully compensated for the ground current, it is impossible to judge whether the fault has disappeared based on the amplitude and phase relationship of the system phase voltage and zero-sequence voltage The problem

Method used

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  • A controllable voltage source fully compensated ground fault state discrimination method and system
  • A controllable voltage source fully compensated ground fault state discrimination method and system
  • A controllable voltage source fully compensated ground fault state discrimination method and system

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Embodiment 1

[0047] see figure 1 It is a schematic flow chart of a controllable voltage source fully compensated ground fault state judgment method for this application, figure 2 For this application, a controllable voltage source alone realizes the electrical circuit diagram of the full compensation of the ground current.

[0048] A controllable voltage source fully compensated ground fault state discrimination method, said controllable voltage source fully compensated ground fault state discrimination method includes the following steps:

[0049] The single-phase of the power distribution system is grounded, and the compensation voltage is output by the controllable voltage source to fully compensate the grounding current of each line.

[0050]Specifically, in low-medium and low-voltage distribution networks, single-phase ground faults account for the vast majority of the total number of faults, and grounding is divided into various types, including intermittent arc grounding and metal...

Embodiment 2

[0065] see image 3 For this application, an electrical circuit diagram of a controllable voltage source connected in parallel with an arc suppression coil to realize full compensation of ground current.

[0066] A controllable voltage source fully compensated ground fault state discrimination method, said controllable voltage source fully compensated ground fault state discrimination method includes the following steps:

[0067] The single-phase of the power distribution system is grounded, and the grounding current of each line is fully compensated through the output compensation voltage of the controllable voltage source; and the controllable voltage source is connected in parallel with the arc suppression coil, and the grounding capacity current is compensated through the arc suppression coil.

[0068] In the second implementation of the application, the neutral point is connected to a controllable voltage source through a grounding transformer, and the controllable voltag...

Embodiment 3

[0079] see figure 2 For this application, a controllable voltage source alone realizes the electrical circuit diagram of the full compensation of the ground current.

[0080] A controllable voltage source fully compensated ground fault state discrimination system, comprising a computer device programmed to execute the steps of the controllable voltage source fully compensated ground fault state discrimination method described in claim 1.

[0081] A controllable voltage source fully compensated ground fault state judgment system, the controllable voltage source fully compensated ground fault state judgment system includes:

[0082] The current full compensation program unit is used to monitor whether the power distribution system is single-phase grounded, and output the compensation voltage through the controllable voltage source to perform current full compensation on each line;

[0083] It is also used to obtain the impedance of the corresponding line by obtaining the resis...

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Abstract

The application discloses a controllable voltage source fully compensated grounding fault state judgment method and system. After a single phase of the system is grounded, the controllable voltage source outputs a compensation voltage for grounding current compensation. During the compensation process, the amplitude and phase of the output voltage of the controllable voltage source do not change. According to the maximum value and the second maximum value of the absolute value of the zero-sequence current phase angle difference of each line, it is judged whether there is a ground fault fault, when the maximum value in the absolute value sequence of the zero-sequence current phase angle difference of each line is ≥ 2°, and the second maximum value is ≤ 1°, then the ground fault of each line disappears, otherwise, there are still faults in each line Mutually. Under various topological structures of full compensation of grounding current of controllable voltage source, the fault state can be judged quickly and accurately, and it is enough to provide a basis for the whole realization of full compensation of grounding current of controllable voltage source and the zero sequence current of each line. Judgment method for ground fault status.

Description

technical field [0001] The present application relates to the technical field of single-phase ground current full compensation of power grid, in particular to a method for judging the state of a controllable voltage source full compensation ground fault. Background technique [0002] In power grid systems, especially in medium and low voltage distribution network systems, single-phase ground faults account for the vast majority of total faults. The neutral point grounding methods of the medium and low voltage distribution network mainly include the neutral point non-grounding method, the neutral point grounding method through the arc suppression coil and the neutral point grounding method through the low-value resistance. In the neutral point ungrounded mode, the ground current is not compensated and operates with a fault, which poses a risk of personal electric shock. In the mode of grounding the neutral point through the arc-suppression coil, the arc-suppression coil comp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/52G01R31/08H02J3/18
CPCY02E40/30
Inventor 刘红文王科柴晨超杨庆
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST