4Gibbs S G, Miller D L. Inferring power consumption and electrical performance from motor speed in oil-well pumping units[J]. IEEE Transactions on Industry Applications, 1997, 33(1): 187-193.
5API RP 11L. Design calculation of Sucker rod pumping system[S]. Washington. American Petroleum Institute, 1967.
6Luo Yingli, Cui Xueshen. A multifunction energy saving device with a novel power-off control strategy for beam pumping motors[J]. IEEE Transactions on Industry Applications, 2011, 47(4). 1605-1611.
7Dong Shimin, Cui Yang. The dynamic simulation model and comprehensive simulation algorithm of the beam pumping system[C]//International Conference on Mechanical and Automation Engineering. Jiujiang, China, 2013.
8Aydogmus O, Sunter S. Four-quadrant operation of PMSM drive fed by a matrix converter[C]//IEEE International Conference on AC EMP. Istanbul: IEEE, 2011: 436-439.
9Qin Hengsi, Kimball J W. Solid state transformer architecture using AC-AC dual active bridge converter [J]. IEEE Transactions on Industry Applications, 2013, 60(9): 3720-3730.
10Agamloh E B. The partial-load efficiency of induction motors[J], IEEE Transactions on Industry Applications, 2009, 45(1): 332-340.
