An intelligent voltage protection system and method under complex power grid conditions
By acquiring voltage signals in real time in complex power grids and constructing a hierarchical protection setting table, combined with the line impedance matrix for fault location, the problem of inaccurate voltage sag detection in existing technologies is solved, achieving accurate voltage sag location and selective protection, thereby improving the stability of the power grid and the reliability of power supply.
CN122203167BActive Publication Date: 2026-07-24WENZHOU BAOXIANG TECH CO LTD
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Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- WENZHOU BAOXIANG TECH CO LTD
- Filing Date
- 2026-05-14
- Publication Date
- 2026-07-24
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Figure CN122203167B_ABST
Abstract
The embodiment of the application relates to an intelligent voltage protection system and method under complex power grid conditions, and belongs to the technical field of power distribution and power supply systems. The method steps comprise: collecting three-phase voltage signals, extracting fundamental wave amplitudes, determining voltage sag events, recording sag depth and duration and generating a feature vector; obtaining a hierarchical voltage protection setting value table, comparing the feature vector with the setting value table, estimating fault point distance and identifying a fault section, and issuing a trip command or maintaining a monitoring state to a circuit breaker in a preset time delay sequence. The embodiment of the application can effectively distinguish the severity of voltage sag events of different degrees, improve the selectivity and accuracy of protection action, minimize the power outage range, guarantee the power supply continuity of non-fault sections, and realize the leap of voltage protection from simple threshold judgment to intelligent hierarchical decision.
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