Neutral point voltage suppression and voltage arc extinction method and system based on active inverter split-phase injection

A neutral point voltage, neutral point technology, applied in the field of distribution network, can solve the problem of difficulty in taking into account the suppression of neutral point displacement voltage for arc suppression and other problems

Active Publication Date: 2020-07-17
HANGZHOU ELECTRIC EQUIP MFG +3
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  • Application Information

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Problems solved by technology

[0005] To sum up, the widely used arc suppression methods and neutral point displacement voltage suppression methods in existing proj...

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  • Neutral point voltage suppression and voltage arc extinction method and system based on active inverter split-phase injection
  • Neutral point voltage suppression and voltage arc extinction method and system based on active inverter split-phase injection
  • Neutral point voltage suppression and voltage arc extinction method and system based on active inverter split-phase injection

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Embodiment Construction

[0059] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0060] A neutral point voltage suppression and voltage arc suppression method based on active inverter phase separation injection. First, active inverter devices are installed at the first end of the three-phase lines of the distribution network; secondly, by monitoring the neutral point of the distribution network Point displacement voltage and distribution network system damping rate, to determine whether the distribution network neutral point displacement voltage exceeds the set value, if exceeded, continue to judge the distribution network system damping rate, otherwise, continue to monitor the distribution network neutral point displacement voltage and the damping rate of the distribution network system; when the variation of the damping rate of the distribution network system exceeds the set variation, or the damping rate of the distribution networ...

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Abstract

The invention discloses a neutral point voltage suppression and voltage arc extinguishing method and system based on active inverter split-phase injection, and the method comprises the steps of respectively hanging active inverters at the head end of a line to adjust a neutral point voltage or a fault phase voltage, and taking a damping rate as a basis for judging a grounding fault or three-phaseimbalance. According to the method, the voltage arc extinguishing can be carried out when the power distribution network is in a single-phase earth fault state, the displacement voltage suppression iscarried out when the power distribution network is in an abnormal operation state, and the device utilization rate is high. Theoretical analysis shows that the method has better voltage arc extinction and displacement voltage suppression capacity, and is flexible in injection mode, higher in reliability and high in adaptability.

Description

technical field [0001] The invention belongs to the field of distribution networks, and in particular relates to a neutral point voltage suppression and voltage arc suppression method and system based on active inverter phase separation injection. Background technique [0002] The complex structure of the distribution network is prone to random arcing ground faults. If it is not handled in time, a large arcing grounding overvoltage will be generated, which seriously threatens the safe and stable operation of the power system. In order to effectively reduce the impact of arc ground faults, the neutral point of my country's distribution network is widely grounded by arc suppression coils, and the reactive part of the fault residual current is compensated by the arc suppression coil inductive current. Compared with the effective grounding of the neutral point, this grounding method increases the zero-sequence impedance of the system. When the parameters of the line to ground ar...

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Application Information

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IPC IPC(8): H02H9/08H02H9/04
CPCH02H9/08H02H9/04Y02E40/30
Inventor 陈晓刚梁洪湘陈识微喻锟郎宏飞曾祥君杨海娟陈柏宇
Owner HANGZHOU ELECTRIC EQUIP MFG
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