Method and system for deriving running state of high-voltage direct-current circuit breaker

Abstract

The invention provides a high-voltage direct-current circuit breaker operation state derivation method and system. The method comprises the following steps: collecting characteristic values of characteristic parameters in a characteristic subset of a high-voltage direct-current circuit breaker; respectively calculating a correlation coefficient matrix and an automatic increase and decrease trend matrix of characteristic parameters of the high-voltage direct-current circuit breaker based on the characteristic values; deducing the running state of the high-voltage direct-current circuit breaker by using the correlation coefficient matrix and the self-increasing and self-decreasing trend matrix; wherein the feature subset of the high-voltage direct-current circuit breaker is obtained by screening feature parameters in an initial feature quantity set of the high-voltage direct-current circuit breaker on the basis of a maximum correlation principle, a minimum redundancy principle, a multi-criterion empowerment sorting algorithm and an association algorithm. According to the invention, data support is provided for operators to timely know the operation state of the high-voltage direct-current circuit breaker, capture early defects of the high-voltage direct-current circuit breaker and scientifically formulate a state maintenance plan, and a powerful technical support is provided for improving the overall operation efficiency and reliability of the high-voltage direct-current circuit breaker.

Description

technical field [0001] The invention relates to the field of on-line monitoring of DC equipment, in particular to a method and system for deriving the operating state of a high-voltage DC circuit breaker. Background technique [0002] High-voltage DC circuit breaker is a comprehensive electrical device formed by effectively integrating a variety of devices with different electrical characteristics through reasonable connection methods and set operating logic. It also has the current carrying capacity and insulation capacity of mechanical switches and solid-state switches breaking ability. [0003] During the steady-state operation of HVDC circuit breakers, it is one of the important tasks of on-line monitoring of HVDC circuit breakers to analyze the overall operating state change trend of HVDC circuit breakers, predict equipment failures and analyze life cycle status. Since the characteristic parameters of power electronic devices in the degradation process have the charact...

AI Technical Summary

Problems solved by technology

Since the characteristic parameters of power electronic devices in the degradation process have the characteristics of slow state change, unobvious deviation characteristics, and easy to be covered by unknown disturbances and noises, it is difficult for the existing conventional monitoring methods to monitor the power during the steady-state operation of the high-voltage DC circuit breaker. The degradation process of electronic devices is described, and the accumulation of device degradation over time can form potential failures that endanger the safe operation of equipment

[0004] The topology design of high-voltage DC circuit breakers is complex, and the application of a large number of power electronic devices and switching devices increases the vulnerability of equipment operation

The relationship between power electronic devices is complex, and any local micro-deterioration may propagate and diffuse through the communication path between subsystems, so that the degradation process may change suddenly in a short period of time, which will lead to the failure of the high-voltage DC circuit breaker system.

[0005] At present, most of the monitoring research on high-voltage DC circuit breakers focuses on the failure mechanism of power electronic devices or modules, the analysis of fault characteristic parameters, and the fault diagnosis and location of electronic components. Lack of relevant research on identifying or assisting in identifying minor degradation of power electronic devices and switching devices

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