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Controllable voltage source grounding current full compensation output voltage calculation method and device

A technology of output voltage and ground current, which is applied in the field of calculation method and device for fully compensated output voltage of controllable voltage source ground current, can solve problems such as poor reliability of power supply, and achieve the effect of solving poor reliability of power supply

Active Publication Date: 2019-05-17
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology

[0003] This application provides a controllable voltage source grounding current fully compensated output voltage calculation method and device to solve the problem of poor reliability of the existing power supply

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  • Controllable voltage source grounding current full compensation output voltage calculation method and device
  • Controllable voltage source grounding current full compensation output voltage calculation method and device
  • Controllable voltage source grounding current full compensation output voltage calculation method and device

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Embodiment Construction

[0040] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0041] see Figure 1-3 .

[0042] The implementation of this application provides a method for calculating the output voltage of a controllable voltage source ground current fully compensated output voltage. The calculation method includes:

[0043] Step 101, when the grid system is operating normally, the controllable voltage source outputs voltage signals with different frequencies;

[0044] Step 102, measuring the voltage component of the output voltage of th...

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Abstract

The invention provides a controllable voltage source grounding current full compensation output voltage calculation method and device. The calculation method comprises the following steps: outputtinga pilot frequency voltage signal by a controllable voltage source when a grid system is in normal operation; measuring a voltage component of the output voltage of the controllable voltage source at the pilot frequency and a current component of the output current at the pilot frequency; according to the voltage component, the current component and an arc suppression coil loop impedance value, calculating the impedance formed by single-phase ground distribution parameters of the grid system, wherein the distribution parameters include the ground leakage resistance and the distributed capacitance; and calculating a compensation voltage value output by the controllable voltage source according to the output impedance of the controllable voltage source to a system neutral point, a phase voltage of a grounded phase before grounding during single-phase grounding, and the impedance formed by the arc suppression coil loop impedance and the single-phase ground distribution parameters of the grid system. The controllable voltage source grounding current full compensation output voltage calculation method and the device provided by the invention can effectively solve the problem that the existing power supply reliability is poor.

Description

technical field [0001] The present application relates to the technical field of grid electric power, in particular to a method and device for calculating the output voltage of a controllable voltage source with ground current full compensation. Background technique [0002] In the power grid system, especially in the medium and low voltage distribution network system, the single-phase ground fault accounts for the absolute 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 c...

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Application Information

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IPC IPC(8): G01R19/00G01R27/20G06F17/10G06F17/15
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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