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Electromagnetic torque can be used to form a model reference adaptive system (MRAS) to achieve online identification of rotor time constant in an induction motor drive. The steady-state torque error caused by rotor time constant error is established in this paper. Based on the steady-state analysis, the converging relationship in the MRAS is found out to be lost for some operating points. Then the...
Electromagnetic transients resulting from voltage dips complicate the low-voltage ride-through (LVRT) of doubly fed induction generator (DFIG) based wind turbines (WTs). To study the transients deeply, an analytical method to solve the dynamic response is presented in this paper. Although some attempts have been made in literature, the accuracy cannot be ensured, or the physical significance implied...
This paper proposes an optimal current control with linear quadratic regulators for 3-phase grid-connected inverters. Because the 3-phase current control is a multivariable control problem with multiple interconnected loops, the traditional control methods, like proportional-integral-derivative control and predictive control, have the difficulty in optimizing their parameters. The proposed control...
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