A zero-sequence voltage suppression method based on neutral grounding impedance optimization control

Abstract

The invention relates to a zero-sequence voltage suppression method based on neutral point grounding impedance optimization control, which comprises the following steps: S11, real-time measuring distribution network parameters to ground; 12, adjusting that parameters of the parallel resistance or the series resistance of the arc suppression coil according to the ground parameters; further, the ground parameters include a ground capacitance and a damping rate; Further, the specific method of the step S11 is to tune the arc suppression coil to a state far away from the resonance point when the power network is in normal operation, monitor the magnitude of the capacitive current of the power network in real time, and instantaneously adjust the arc suppression coil to carry out compensation after the single-phase grounding occurs in the power network; The host computer determines the transient traveling wave signal detection sensor corresponding to the fault feeder according to the alarm type; The invention has an effective fault protection circuit. The utility model has the advantages of avoiding arc reignition at the fault point.

Description

technical field [0001] The invention belongs to the technical field of line fault detection, and in particular relates to an initial fault location and early warning method of a distribution network. Background technique [0002] The distribution network is a network that plays an important role in distributing electric energy in the power network. It is generally composed of overhead lines, cables, towers, distribution transformers, isolating switches, reactive power compensators and some auxiliary facilities. The distribution network usually has three-phase-to-ground parameter asymmetry and three-phase load imbalance, which causes the problem of unbalanced three-phase output voltage of the distribution network and brings a series of hazards to the power system and users. The output of the transformer endangers the safety of the transformer; the utilization rate of the motor capacity decreases; the loss of the power grid increases; the power supply equipment cannot work nor...

AI Technical Summary

Problems solved by technology

However, with the method of manually switching capacitors or voltage regulators, the switching time and switching capacity depend on the past operating experience of the system, and the accuracy and speed of suppression are difficult to meet the requirements; the method of changing the system grounding will cause serious problems in the system operation mode. Large changes may lead to resonance, resulting in greater voltage imbalance

Therefore, existing suppression methods still have problems, the suppression is not reliable, and the effect is not obvious