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Wind power, as an important and promising renewable resource, is widely studied. Because the wind is highly variable, it is very desirable to operate a wind turbine at variable speeds. In this respect, doubly fed induction generator (DFIG) has become popular in wind power generation system. The steady state simulation analysis of a DFIG is essential to understand the behavior of DFIG such that it...
This paper introduces a general Bayesian framework for obtaining sparse solutions to classify predicting, and the practical model 'relevance vector machine' (RVM) by Michael E. Tipping, which is applied in electric system transient stability assessment (TSA). As a bran-new thought of probabilistic learning model, it offers the superior level of generalization accuracy and a number of additional advantages...
With the development of tidal current power generation technology, the research on developing of detection and control system, which is suitable for the energy conversion of tidal current generation, is becoming an important component of developing tidal current energy. The paper introduces the basic composition of tidal current power generation system, as well as the detection and control technology,...
In this paper, an improved torque control method for induction motor driven by a matrix converter is presented, in which the principles of variable-structure(VS) control and direct torque control (DTC) are combined to ensure high-performance operation in the steady state and under transient conditions. Two hysteresis regulators or the existing proportional-integral controllers of torque and flux were...
In the rotor winding magnetomotive force (MMF) of an ac machine, there exist so-called slot harmonics which appear in pairs and the lower order harmonic of each pair rotates in the opposite direction against the fundamental component. In addition, the slot harmonics have the same winding factor as the fundamental component. Based on these properties, this paper develops a brushless doubly fed machine...
This paper proposes a new direct power control (DPC) strategy and a novel crowbar protection technique for the doubly fed induction generator (DFIG) used in the wind power generation systems. The main difficulty for a DFIG to ride through severe unbalanced grid voltage dips is the large transient currents induced in the rotor windings, which may damage the ac excitation converter. The proposed DPC...
Poor line power factor is one of disadvantages of the cascade speed control in wound rotor induction motor drives. So a new method to improve the line power factor of cascade speed control system is proposed, which integrates power factor correction (PFC) and cascade speed control. Then the principle of cascade speed control (CSC) with PFC is analyzed in detail. For the low slip voltage frequency,...
In this paper, a software package of finite element (FE) analysis for induction machines is presented. The back-EMF in windings is expressed by magnetic vector potential, which is used to couple with transient finite element analysis. The equations of drive circuit and rotor bars are described by loop circuit equations. The pre-processing and post-processing of this package are developed based on...
We investigated the effects of armature reaction on the performance of a three-phase three-stack claw pole motor with soft magnetic composite stator core by using three-dimensional finite-element analysis (FEA), which is an effective approach to accurately compute the parameters and performance such as the back electromotive force (EMF), core losses, and winding inductance at various saturation levels...
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