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Flexible grounding system applied to ungrounded system of power distribution network and control method of flexible grounding system

A flexible grounding and grounding system technology, applied in the field of distribution network, can solve problems such as overvoltage and unbalanced parameters of three-phase lines of distribution network to ground.

Pending Publication Date: 2022-03-01
SHANDONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the capacitive current of the ungrounded system is relatively small (generally less than 20A), arc suppression coils may not be installed in the regulations, but there is still the risk of intermittent arcing grounding, which is likely to cause intermittent arcing overvoltage
In addition, there is an unbalance of three-phase line-to-ground parameters in the distribution network, and there is a certain offset in the neutral point voltage during normal operation, and it is still necessary to minimize its offset value during normal operation

Method used

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  • Flexible grounding system applied to ungrounded system of power distribution network and control method of flexible grounding system
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  • Flexible grounding system applied to ungrounded system of power distribution network and control method of flexible grounding system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Embodiment 1 of the present disclosure introduces a flexible grounding system applied to an ungrounded system of a distribution network.

[0049] Such as figure 1 A flexible grounding system applied to the ungrounded system of the distribution network is shown, including a grounding transformer arranged on the busbar of the ungrounded system of the distribution network and a flexible grounding device electrically connected to the grounding transformer;

[0050]Among them, the flexible grounding device includes a transformer unit, a filter unit, an inverter unit and a power supply unit connected in series in sequence; the anode of the secondary side of the transformer unit is connected to the grounding transformer, and the cathode is grounded; the primary side of the transformer unit is connected to the filter unit; the inverter unit adopts a single phase inverter; the power supply unit includes diode rectification circuits and capacitors connected in parallel; the recti...

Embodiment 2

[0054] Embodiment 2 of the present disclosure introduces a control method for a flexible grounding system applied to an ungrounded system of a distribution network.

[0055] Such as image 3 A control method for a flexible grounding system applied to an ungrounded system of a power distribution network includes the following steps:

[0056] Step S01: the flexible grounding system is in normal operation and overvoltage damping mode, then go to step S02;

[0057] Step S02: Detect whether a single-phase ground fault occurs, and if so, turn to step S03;

[0058] Step S03: block the inverter unit, complete the judgment of the faulty phase, and go to step S04;

[0059] Step S04: The operation mode of the flexible grounding system is converted to the arc suppression mode under the single-phase ground fault, and it is detected in real time whether the single-phase ground fault disappears, and if it is, the inverter unit is blocked, and the process goes to step S01;

[0060] Step S0...

Embodiment 3

[0080] Embodiment 3 of the present disclosure provides a computer-readable storage medium.

[0081] A computer-readable storage medium on which a program is stored. When the program is executed by a processor, the steps in the method for controlling a flexible grounding system applied to an ungrounded system of a power distribution network as described in Embodiment 2 of the present disclosure are implemented.

[0082] The detailed steps are the same as the control method of the flexible grounding system applied to the ungrounded system of the distribution network provided in the second embodiment, and will not be repeated here.

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Abstract

The invention belongs to the technical field of power distribution networks, and provides a flexible grounding system applied to an ungrounded system of a power distribution network and a control method thereof, and the method comprises the following steps: S01, when the flexible grounding system is in a normal operation and overvoltage damping mode, turning to S02; step S02, detecting whether a single-phase earth fault occurs, and if so, turning to step S03; step S03, locking the inversion unit, completing the judgment of a fault phase, and turning to step S04; step S04, converting the operation mode of the flexible grounding system into an arc extinction mode under a single-phase grounding fault, detecting whether the single-phase grounding fault disappears or not in real time, if so, locking the inverter unit, and turning to step S01; and S05, locking the inversion unit, performing transition conversion of the operation mode of the flexible grounding system, and turning to the step S04.

Description

technical field [0001] The disclosure belongs to the technical field of distribution network, and in particular relates to a flexible grounding system applied to an ungrounded system of a distribution network and a control method thereof. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] my country's distribution network generally adopts non-effective grounding forms, that is, ungrounded systems and arc-suppression coil grounding systems. Because there is no effective grounding point, problems such as overvoltage to ground and flashover of equipment often occur. This form of ineffective grounding will cause insulation breakdown and seriously affect the safety of the power system. With the development of power electronic devices, power electronic control is gradually applied to the flexible structure of distribution network. As a form of gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
CPCH02J3/0012H02J3/00125H02J3/002
Inventor 栾晓明武守远邵华强刘成孔庆绿李冰
Owner SHANDONG UNIV