A voltage control method of an active arc suppression device in a distribution network

Abstract

The invention discloses a voltage control method for the active arc extinction device of a power distribution network. According to the method, the method is used for controlling the output voltage ofthe active arc extinction device connected between a neutral point and the earth. In this way, the output voltage of the active arc extinction device is kept consistent with a fault phase voltage during the occurrence of the single-phase earth fault of the device. As a result, the purpose of fault arc extinction is achieved. According to the method, the purpose of controlling the output voltage is achieved by injecting a specific current into the neutral point. The current comprises active, reactive and harmonic components corresponding to the fault current. The control method specifically comprises two parts, namely a neutral point voltage outer ring and an output filter inductance current inner ring. The outer ring adopts a combined form of a proportional integrator and a proportional resonance controller, wherein the voltage of the neutral point is adjusted to generate a current inner loop given value. The inner loop adjusts the inductance current of an output filter by adopting aproportional regulator so as to track a current inner ring given value, and improves the current control accuracy through the capacitance voltage feedforward of the output filter. Therefore, no capacitance current is required. The purpose of arc extinction under the condition of the change of the grounding resistance and the distortion of the fault current can be realized.

Description

technical field [0001] The invention relates to the field of active arc suppression for ground faults, in particular to a voltage control method for an active arc suppression device in a distribution network. Background technique [0002] In the distribution network, the reliability of power supply is of great significance. Most of the reliability problems of power supply originate from single-phase ground faults. The expansion of the distribution network increases the ground fault current, and the fault arc cannot be extinguished naturally, which easily leads to the interruption of power supply. The traditional ground fault arc suppression device is mainly aimed at the capacitive component of the ground current, without considering its active component and harmonic component, and needs to detect the capacitive current, so the arc suppression effect is limited. In addition, the arc suppression coil and the line-to-ground capacitance may have series resonance, which may caus...

AI Technical Summary

Problems solved by technology

The expansion of the distribution network will increase the ground fault current, and the fault arc cannot be extinguished naturally, which will easily lead to the interruption of power supply

The traditional ground fault arc suppression device is mainly aimed at the capacitive component of the ground current, without considering its active component and harmonic component, and needs to detect the capacitive current, so the arc suppression effect is limited

In addition, the arc suppressing coil and the line-to-ground capacitance may have series resonance, which may cause overvoltage and cause cross-line faults and line insulation damage

Images