Intelligent power distribution network neutral point grounding active full-compensation control system

Abstract

The invention relates to the arc quenching and voltage stabilization technology of a power distribution network neutral point grounding fault point and particularly relates to an intelligent power distribution network neutral point grounding active full-compensation control system. The intelligent power distribution network neutral point grounding active full-compensation control system is characterized in structure by comprising a data acquisition system, a control circuit, a driving circuit, an inversion circuit, a filter circuit, an access circuit and a control power source, wherein a data acquisition end of the data acquisition system is connected with an electric power system, an output end of the data acquisition system is connected with the control circuit, a control output end of the control circuit is respectively connected with the driving circuit and the control power source, and the inversion circuit is connected with an input end of the electric power system respectively through the filter circuit and the access circuit. The system is advantaged in that a voltage recovery open loop and closed loop control method taking a dissonance degree, a damping rate, reactive compensation current and active compensation current as parameters is provided according to analysis, timely self-healing of a fault is guaranteed, moreover, the system voltage can recover to a normal state rapidly.

Description

technical field [0001] The invention relates to an arc extinguishing and voltage stabilization technology at a neutral point grounding fault point of a distribution network, in particular to an active full compensation control system for a neutral point grounding of an intelligent distribution network. Background technique [0002] According to statistics, in the operation of the power grid, more than 95% of power outages are caused by the distribution network. Single-phase grounding is the most important form of faults in the distribution network, accounting for about 80% of the total faults. Therefore, when a fault occurs, it is of great significance to realize the self-healing or even seamless self-healing of the smart grid without power outage. When the neutral point of distribution network adopts non-effective grounding method (commonly known as small current grounding method, which traditionally mainly includes non-grounding and arc-suppression coil grounding), the fau...

AI Technical Summary

Problems solved by technology

[0009] It can be concluded that although the traditional arc suppressing coil has a certain inhibitory effect on voltage recovery, because the system detuning degree v and damping rate d are relatively fixed, its voltage recovery process is a natural characteristic of the system and cannot be controlled or adjusted by other measures

The voltage recovery is generally completed within a few cycles, and sufficient time cannot be reserved for arc insulation recovery.

Especially when the amount of overcompensation is large (the degree of detuning is large), there will be a beat frequency phenomenon, not only the voltage recovery time is greatly advanced, the maximum value of the recovery voltage will exceed the normal phase voltage, which is very unfavorable for arc insulation recovery

Traditional arc suppression coil tuning does not take suppression of voltage recovery as the main goal

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