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Grounding residual current adaptive active full-compensation control method

A compensation control and self-adaptive technology, applied in the direction of emergency protection circuit devices, electrical components, circuit devices, etc. for limiting overcurrent/overvoltage, it can solve problems such as failure to find faults in time, and achieve the effect of maintaining safe power operation.

Active Publication Date: 2021-05-07
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Grounding residual current adaptive active full-compensation control method
  • Grounding residual current adaptive active full-compensation control method
  • Grounding residual current adaptive active full-compensation control method

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Experimental program
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Effect test

Embodiment 1

[0049] like 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 distributi...

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 adaptive active full-compensation control method, which belongs to the technical field of power distribution fault maintenance. When a power distribution network normally operates, a residual current full-compensation device adjusts the gear of a main arc extinction module according to a calculation result, so that the gear is kept at a 15% over-compensation position; the method comprises the steps of estimating a fundamental wave capacitance current value of each feeder line of a power grid under different single-phase earth faults, earth capacitance of each line and distortion components of current by utilizing historical fault recording data when the power grid has the single-phase earth faults; estimating the grounding fault total current by using the zero sequence current of the fault line, the system ground capacitance calculated in the normal state, the estimated fault line capacitance and the empirical value of the current distortion in the fault state; and detecting the current compensation current of a main arc-extinguishing module and a slave arc-extinguishing module, and controlling an active slave arc-extinguishing coil to realize the full compensation of the grounding residual current by applying an active inversion algorithm. According to the invention, rapid and real-time full compensation of the single-phase grounding fault residual current of the power distribution network can be realized.

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 Applications(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