A Novel Dynamic Weight Allocation Method for Assessing the Health Status of Remote Terminal Unit in Distribution Automation System Based on AHM and GRA

Abstract

Background: The remote terminal units (RTUs) in distribution automation system (DAS) are widely used in the field in recent years. It is lack of sample data in different operation status that makes the RTU maintenance improper. The weight allocation for the monitoring indicators in the health status evaluation needs to be identified efficiently and properly. Methods: A systematic health status assessment indicator system is constructed firstly. And then, a hybrid indicator weight allocation algorithm based on the attribute hierarchy model (AHM) and grey relational degree (GRA) is proposed to identify the elementary item in the weight allocation under small sample condition. The final indicator weight would be dynamically adjusted according to the equilibrium coefficient, which is determined by the indicator condition parameter. Results: The simulation results show that the weight allocation can be effectively and reasonably adjusted according to the indicator value even under small sample condition. Conclusion: The expert experience and objective data laws are combined and used in our proposed dynamic weight allocation method. It can be used to assess the health status of RTU in the electrical power distribution network.

Research on Hybrid AC Sampling Technology in Substation Based on Frequency Threshold

“…The principle of synchronous sampling is the ratio of the sampling frequency to the actual system frequency, a fixed proportional relationship, which indicates that the acquisition frequency tracks the system frequency in real time [1]. Software synchronous sampling is widely used in the engineering field.…”