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A self-adaptive active full compensation control method for ground residual current

A compensation control and self-adaptive technology, which is applied to emergency protection circuit devices, electrical components, emergency protection circuit devices, etc. used to limit overcurrent/overvoltage, can solve problems such as failure to find faults in time, and maintain safe operation of power Effect

Active Publication Date: 2022-04-08
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this invention does not overcompensate the distribution network under normal conditions, and does not analyze the distortion component of the capacitor current when a fault occurs, so that the invention cannot detect the fault in time and fully compensate the fault in time

Method used

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  • A self-adaptive active full compensation control method for ground residual current
  • A self-adaptive active full compensation control method for ground residual current
  • A self-adaptive active full compensation control method for ground residual current

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Effect test

Embodiment 1

[0049] Such as figure 1 As shown, a ground residual current adaptive active full compensation control method includes the following steps:

[0050] S1: When the distribution network is in normal operation, the residual current full compensation device continuously detects the neutral point voltage, the gear position and reactance value of the main arc suppression module, and estimates the capacitance value of the current system to ground; adjust the main quenching module according to the calculation results The gear position of the arc module, so that it remains at the position of overcompensation of 15%;

[0051] S2: Using the historical fault recording data when a single-phase ground fault occurs in the power grid, estimate the fundamental capacitance current value of each feeder line under different single-phase ground faults, the ground capacitance of each line and the distortion component of the current;

[0052] S3: When a single-phase ground fault occurs in the distrib...

Embodiment 2

[0083] The ground residual current adaptive active full compensation control method of the embodiment of the present invention differs from the first embodiment in that:

[0084] 1. The compensation current mainly includes two parts: the estimation of the line-to-ground capacitance current and the estimation of the line-to-ground resistance current.

[0085] (1) Estimation of line-to-ground capacitance current

[0086] In the calculation formula of line-to-ground capacitance current shown in formula (2), the zero-sequence voltage u 0 Measurable, the grid frequency can be measured, and the line-to-ground capacitance C 0 It cannot be measured and needs to be obtained by estimation. Secondly, since the capacitor current leads the zero-sequence voltage by 90°, the zero-sequence voltage needs to be phase-shifted in the actual calculation after knowing the capacitor value. The estimation block diagram of the capacitor current is shown in Figure 4 shown.

[0087] Use the signal ...

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Abstract

The invention discloses a grounding residual current self-adaptive active full compensation control method, which belongs to the technical field of power distribution fault maintenance. When the distribution network is in normal operation, the residual current full compensation device adjusts the gear of the main arc suppression module according to the calculation result. to keep it at the position of overcompensation of 15%; use the historical fault recording data when single-phase ground faults occur in the power grid to estimate the fundamental capacitive current value of each feeder line under different single-phase ground faults, and each line The capacitance to ground and the distortion component of the current; use the zero-sequence current of the fault line, the system capacitance to ground calculated under normal conditions, the estimated capacitance of the fault line, and the empirical value of current distortion in this fault state to carry out the ground fault full current Estimation; Detect the current compensation current of the main arc suppression module and the slave arc suppression module, and apply the active inverter algorithm to control the active slave arc suppression coil to realize the full compensation of the grounding residual current. The invention can realize fast and real-time full compensation of the single-phase grounding fault residual current of the distribution network.

Description

technical field [0001] The invention relates to the technical field of power distribution fault maintenance, in particular to a grounding residual current self-adaptive active full compensation control method. Background technique [0002] With the increasing capacity of urban distribution network and the large increase of nonlinear loads and cable lines, while the magnitude of the ground fault current is increasing, the residual current component it contains is also greatly increasing, while the traditional arc suppressing coil The active component and harmonic component in the ground fault current cannot be compensated, which makes it difficult to control the ground residual current within the specified range. A large residual current will cause the arc to be unable to be extinguished in time, which seriously threatens the safe operation of the power grid and also poses a huge threat to personal safety. Therefore, active arc suppression based on full compensation of ground...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/08
CPCH02H9/08
Inventor 王鹏冯光王晗董轩张建文徐铭铭张建宾陈明施刚贾雅君
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST