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Obtaining method and device for controlled voltage source ground connection current total compensation output value

A technology of voltage output and ground current, which is applied in the field of distribution network system, can solve the problems of obtaining the compensation output value of controllable voltage source, etc., and achieve the effect of reducing the difficulty of implementation, simple calculation method, and simple implementation method

Active Publication Date: 2019-03-22
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology

[0004] This application provides a method and device for obtaining the output value of the ground current full compensation of the controllable voltage source to solve the problem in related technologies that it is impossible to quickly and accurately obtain single-phase grounding under various topological structures with full compensation of the ground current of the controllable voltage source The problem of compensating output value of controllable voltage source

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  • Obtaining method and device for controlled voltage source ground connection current total compensation output value
  • Obtaining method and device for controlled voltage source ground connection current total compensation output value
  • Obtaining method and device for controlled voltage source ground connection current total compensation output value

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[0036] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0037] figure 1 The controllable voltage source 10 described in this application may be a combination of a controllable inverter voltage source 101 and a grounding transformer 102 realized by power electronics technology. Limited to other possible implementations. The controllable voltage source is electrically connected with the power grid system for full compensation of ground current.

[0038] figure 2 It is the electrical circuit diagram of the full compensation structure based on the parallel connection of the controllable voltage source and the arc suppression coil, figure 2 The neutral controllable voltage source 10 is connected in parallel with the arc suppressing coil 20, so tha...

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Abstract

The invention discloses an obtaining method and device for a controlled voltage source ground connection current total compensation output value. The method comprises the steps that detection voltageis output by a controlled voltage source, and the amplitude of the detection voltage is controlled to be constant, and the phase of the detection voltage is changed; the voltage falling number of a target phase before and after the controlled voltage source outputs the detection voltage is calculated; if the voltage falling number is within the threshold value range, the phase difference between the detection voltage and the target phase voltage before the controlled voltage source outputs the detection voltage is calculated; the phase difference is adopted, and the voltage output value for controlled voltage source total compensation during system single phase ground connection is calculated. Under various topology structures of controlled voltage source ground connection current total compensation, the voltage output value of controlled voltage source total compensation during single phase ground connection can be rapidly and accurately obtained, and the controlled voltage source total compensation implementation difficulty is lowered.

Description

technical field [0001] The present application relates to the technical field of distribution network systems, in particular to a method and device for obtaining an output value of ground current full compensation of a controllable voltage source. Background technique [0002] In the power grid system, especially the medium and low voltage distribution network system, single-phase ground faults account for the vast majority of the total number of 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 or the neutral point grounding method through a 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. When the neutral point is grounded through the arc-suppression coil, the arc-suppression coil compe...

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Application Information

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IPC IPC(8): G01R31/02G01R31/08H02H9/08
CPCG01R31/086G01R31/088G01R31/50H02H9/08
Inventor 刘红文王科张恭源柴晨超杨庆
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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