文档介绍：100 IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, VOL. 46, NO. 1, FEBRUARY 1999
A Dynamic Decoupling Control Scheme for
High-Speed Operation of Induction Motors
Jinhwan Jung, Student Member, IEEE, and Kwanghee Nam, Member, IEEE
Abstract— In a high-speed operation of a vector-controlled TABLE I
induction motor, coupling between d –q current dynamics impairs THE RELATIVE MAGNITUDES OF PONENTS
the characteristics of torque response. The feedforward decou- OF AN INDUCTION MOTOR VERSUS MOTOR SPEED
pling scheme does not perform well if there exists an error in
the motor parameter estimation. We derive a dynamic decou-
pling condition when the two additional proportional integral
current controllers are used. A great advantage of this dynamic
decoupling controller is the robustness to the motor parameter
estimation errors. Further, we observe that overmodulation meth-
ods lead to the violation of the decoupling condition, thereby
yielding a poor performance in the high-speed high-power op-
eration. As a method of resolving this problem, we propose
a decoupling preserving overmodulation algorithm which also
enhances the torque transient response. Through simulation and of the three terms versus speed. Note that the proportion of
experimental results, we demonstrate the improved performance coupling term grows large as the speed increases. For example,
of the proposed controller.
the coupling term takes approximately more than 30% of the
Index Terms— Coupling, decoupling preserving overmodula- applied voltage above 8000 r/min. Hence, the coupling may
tion, dynamic decoupling, feedforward decoupling, high-speed deteriorate the current response in the high-speed range, if it
operation, overmodulation, robustness.
is not pensated.
A well-known decoupling strategy is to calculate the cou-
I. INTRODUCTION pling voltages using the stator current and to add their negative
NDUCTION motors are suitable for high-speed operation quantities to the con