Electric machine driving method and system under non-conventional work mode of oil pumping unit
The present invention discloses a method and a system pertaining to the field of oil production engineering. According to the method, the crank complete-cycle operation uses a utility frequency driving mode, and the crank incomplete-cycle pumping operation and the crank incomplete-cycle no-pumping, operation use a variable, frequency driving mode. The system is provided with a utility frequency loop and a variable frequency loop which are provided with a common input terminal and a common output terminal. The common input terminal of the utility frequency loop and the variable frequency loop is connected to a utility frequency power supply circuit, and the output terminal is connected to a driving electric machine of the oil pumping unit. A frequency changer is configured in the variable frequency loop. An operation control unit is further configured outside the utility frequency loop and the variable frequency loop.
HARBIN SURFICS ELECTRICAL TECHNOLOGY INC
H H F E F H
H02P H02P F04B E21B F04B H02P
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Feifei Wen Ye Chenglin Hongliang Jie Chunlong Min Yanan Jinyuan Mingting Feng Lin Yunlong Guoqing Deshi
Wan Xing Yang Liu Gong Zhang Sun Zhang Sun Li Han Wei Wang Chen Wang Zhang