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The dynamics of load, especially induction motors, are the driving force for short-term voltage stability (STVS) problems. In this paper, the equivalent rotation speed of motors is identified online and its recovery time is estimated next to realize an emergency-demand-response (EDR) based under speed load shedding (USLS) scheme to improve STVS. The proposed scheme consists of an EDR program and two...
This paper introduces long primary double sided linear induction motor (LIM) for special industrial applications. The LIM adopts modular structure and uses block feeding method. The significance is increasing efficiency, saving energy and reducing power capacity, the primary parallel connection with segment powered drive is adopted, which consist of long primary double sided LIMs. Each segment motor...
The traction converter consists of a single-phase AC-DC rectifier and a three-phase DC-AC inverter. Due to special structural characteristics of single phase rectifier, a fluctuating voltage component with the frequency twice of the grid's, exists in DC-link voltage. Fed by fluctuating DC-link voltage, a beat phenomenon occurs in traction motor, and harmonic components appear in both stator current...
The characteristic of linear induction motor (LIM) are quite different from the rotary induction motor (RIM) due to the end effects and so on. The conventional high performance control scheme like indirect field oriented control (IFOC) cannot be directly adopted for LIM drives. In this paper, the traction characteristic of the LIM and RIM are compared from different perspectives. The performance of...
In this paper, mathematic model of linear induction motor (LIM) is developed considering the influences of end effects. A full speed range direct thrust control (DTC) scheme for LIM is proposed considering the parameters dynamic variation and characteristic of railway traction application. In low speed range, an improved indirect stator-quantities control (ISC) with circular flux track is applied...
The linear induction motor (LIM) drives using conventional direct thrust control (DTC) schemes have drawbacks of large thrust ripples in low speed range and so on. In this paper, the thrust ripples of the DTC-based LEVI drives are theoretically analyzed. A novel switching scheme using synthesized voltage vector and magnitude modulation method is proposed to replace the conventional switching table...
The normal force existing in the single-sided linear induction motor (SLIM) varies with different operation condition. It is always restrained as far as possible since it has serious influence on the performance of SLIM. In this paper, the relation between normal and thrust forces is analyzed. Decoupling control of the two forces is achieved by the appropriate choices of voltage vectors in PWM inverter...
Due to the existence of end-effects and large mechanic clearance, the parameters of linear induction motor (LIM) are variable and the efficiency is lower than that of rotary induction motor (RIM). This paper proposes a strategy to minimize the losses for direct thrust-controlled linear induction motor drives. The proposed strategy, which is based on a novel search algorithm, chooses primary current...
Single sided linear induction motor (SLIM) has good direct drive ability though its efficiency is poor compared with the rotary counterpart. The motor model including iron loss under synchronous coordination is established and the variable loss function is derived in the paper. In the proposed equivalent circuit model of SLIM, to consider the influence of primary leakage inductance on loss calculation,...
Normal force in single-sided linear induction motor (SLIM) is normally restrained in SLIM transportation system. We developed a combined levitation-and-propulsion device to utilize the normal force for levitation and thrust for propulsion with only a SLIM in our Lab. This paper describes a mathematic model for the analysis of normal -and- thrust forces through a space high harmonic method. A scheme...
Due to the existence of end-effects and the changing operational conditions, the parameters of linear induction motor (LIM) are variable. In this paper, model reference adaptive method is applied to the parameter identification of linear induction motor. Based on the proposed method, the magnetizing inductance and secondary resistance, which are both the most variable in the equivalent circuit of...
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