Exploring Electric Transmission Operation with Cognitive Work Analysis Models

Electric power networks are regarded as complex socio-technical systems as they incorporate a wide number of tasks and dynamic data that needs to be monitored continuously. This preliminary study investigated the work environment of electric power transmission and the related control tasks performed by the system operators. These findings shall be incorporated into the design of an ecological interface to improve situation awareness, reduce cognitive workload, and especially support novice operators in training.

Low-Order Radial Modal Test and Analysis of Drive Motor Stator

For a driving motor stator of EDU (Electric Drive Unit) intelligent electric transmission of a domestic plug-in hybrid electric vehicle, modal tests are performed on the motor stator with or without motor shell. Either the hammering method or the frequency sweeping method is used in the test. The modal frequencies, modal shapes, and damping ratios of the first five orders that meet the requirements of the modal confidence criterion are obtained. The influence of the motor shell on the low-order radial modal of the motor stator is discussed. The results show that similar results are obtained in the modal parameter estimation respectively using the hammering method and the frequency sweeping method. They can both be used for low-order radial modal test of the motor stator. The motor stator without shell exhibits a linear structure in the frequency domain. Each modal frequency obtained by the frequency sweeping method is slightly higher than that obtained by the hammering method.