PHM-based middle and low voltage power distribution network operation and maintenance system and method

Abstract

The invention provides a PHM-based middle and low voltage power distribution network operation and maintenance system and method. The system comprises a data information acquisition and processing module, a state monitoring and fault early warning module, a fault detection and isolation module and a power distribution network health state evaluation module. The zero-sequence voltage abrupt change energy E(k) of the neutral point of the power distribution network is used as a starting criterion of fault early warning of the power distribution network; when a certain feeder reaches an early warning level, a fault detection and isolation module is started, positive sequence current fault components measured by each terminal node on the fault feeder are used for fault direction discrimination and fault positioning, and the amplitude of each phase of voltage is used for fault type identification; and after a master station completes fault positioning and recognition, a small resistor is actively put into the neutral point of the power distribution network for fault isolation. The operation state of the power distribution system can be monitored in real time, the health state of the power distribution system is managed, and the operation efficiency and the operation and maintenance work level of the power distribution system are improved.

Description

technical field [0001] The invention belongs to the field of fault prediction and health state management technology (PHM), and is a monitoring system aimed at integrating multiple technologies such as data collection, information processing, feature extraction, state monitoring, fault warning, health management, and artificial intelligence algorithms. The technology of giving rationalized suggestions for abnormal situations. The PHM power distribution operation and maintenance system includes panoramic state monitoring based on grid flow, fault warning based on neutral point zero-sequence voltage mutation, and constructing feeder section fault direction judgment based on positive sequence current fault components. According to the data, and accurately locate the fault section, use the voltage amplitude of each phase of the fault section detection point to identify the fault type, generate a fault decision based on the zero-sequence current amplitude ratio, and finally divide t...

AI Technical Summary

Problems solved by technology

The traditional operation and maintenance system has the following defects: 1. As the scale of the distribution network tends to be complex, the distribution system has a lack of information interaction between advanced applications, waste of fault information overlap, and low processing capacity in the calculation of large amounts of data and information. 2. The current operation and maintenance mode is not flexible enough to adapt to the intricate and frequently changing power distribution network structure, and cannot follow the enterprise's 3. The power distribution measurement terminal is easily affected by the weather and environment outdoors, and the possible interference of communication may cause the uploaded fault information to be easily distorted and distorted. Missing, because the fault diagnosis algorithm in the existing operation and maintenance system cannot tolerate faults and distort the fault information, resulting in misjudgment and missed judgment in fault diagnosis, and the operation and maintenance system is difficult to adapt to various sudden situations

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