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In this paper, one improved speed estimation method of linear induction motor (LIM) based on stator current observer is developed, of which the observer is deeply investigated and fully optimized. Then it discusses the estimation accuracy of observer influenced by different disturbances, and the effect of observer parameters on dynamic response is analyzed. Through comprehensive simulation, the speed...
The linear induction machine (LIM) suffers heavily from low efficiency due to its large air-gap length, the influence of end-effects, and the partial load conditions. Several loss minimization control (LMC) techniques have been developed for LIM to adjust the flux to an optimal level to reduce the losses in the steady state. However, these methods are not applicable during dynamic process, since it...
The linear induction machine (LIM) suffers heavily from low efficiency, due to its large air-gap length and the influence of end-effects, including transversal edge-effect and longitudinal end-effect. Worse still, its efficiency usually goes down at light load for the comparative higher copper losses caused by constant excitation current. In this paper, to improve the LIM working efficiency, a novel...
The efficiency optimization control (EOC) in steady state optimizes the flux to improve the efficiency of linear induction machine (LIM). However, it is inefficient in dynamic operations, in which the aforementioned flux solution no longer satisfies the change of thrust, thus the efficiency is deteriorated. In this paper, LIM losses including both copper and core losses during thrust transient are...
A three-phase three-wire shunt active power filter based on a H-bridge three-level converter as its main circuit is presented. The dc-link voltage stable conditions and the effects of the fundamental sequence components on the input active power of the inverter are described in details. Then a dc-link voltage control strategy based on the negative sequence current control method is proposed. The dc-link...
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