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Electric vehicles (EVs) constitute a very attractive solution due to environmental and technical reasons. Their reliable performance and efficiency is mainly based on applying effective control and drive techniques. Since EVs are complex electromechanical systems and their nonlinear description make the control design and analysis a cumbersome task, in this paper, sliding mode controllers (SMC) in...
One of the commonly used approaches to avoid the short circuit of power devices for pulse-width-modulation (PWM) inverters is to add dead-time into the control signals. The drawback of this approach is that severe distortion in phase currents and output voltages may occur. This paper proposes an adaptive-linear-neuron based nonlinearity compensation strategy to cope with the disturbance voltage caused...
The Series Dynamic Braking Resistor (SDBR) helps in the post fault recovery of the wind generator. This paper investigates the best location of the SDBR in the Doubly Fed Induction Generator (DFIG) architecture, considering the best switching signal of the SDBR. The SDBR was connected at the stator, rotor and grid side converter of the DFIG wind generator. The DC-link voltage, rotor current and grid...
In this paper the switched reluctance generator (SRG) is explored considering the improvement of its efficiency. This machine generates a DC power that is directly related to input driving parameters. Simulation results are presented bringing a case study of parametric regression to track the best efficiency for any input parameters: excitation voltage and turn off angle. A method known as parametric...
A novel control algorithm, one-cycle control, was adopted in five-phase six-leg switching power amplifiers for magnetic bearing. Mathematical models of current ripple were derived, from which methods to reduce the current ripple is obtained. Simulation and experiments were conducted on for different parameters. The results were compared with bipolar and unipolar one-cycle control, which agrees with...
In this paper, a three-phase 12/8 switched reluctance generator is taken as the study object and a control system based on that generator is designed. In that system, the digital signal controller applied for is dsPIC30F6010, and power converter circuit adopt asymmetric half-bridge topology, and the main switches use power MOSFET. The paper analyzes the process of power generation and the basic structure...
Doubly-Fed Induction Generator (DFIG) has been used extensively in Variable Speed Constant Frequency (VSCF) technique of wind energy generation systems. For DC-Link voltage regulation we used LM-SMC controller on grid side converter. For LVRT Enhancement hybrid of STFCL and DC-Chopper strategy is used. STFCL has the ability to protect converter from over-current and over-voltage as well as gearbox...
This paper presents a method of controlling switched reluctance generators (SRG) for maximum efficiency where the SRG operates in single pulse mode. The analysis and modeling of experiment data showed that the optimal-efficiency turn-on angle can be characterized as a function of output power and speed. Thus the maximum efficiency is achieved where the turn-on angle is fixed at optimum value and the...
This paper proposes a finite control set-model predictive control (FCS-MPC) system for low-voltage ride through (LVRT) capability enhancement of doubly-fed induction generators (DFIGs) in variable-speed wind turbine systems (WTSs). The proposed FCS-MPC system takes the discrete states of the converter into account and the future converter performance is predicted for each sampling period. Then the...
This paper deals with the driver design for Brushless DC Motor (BLDCM) by quasi-sinusoidal voltage source inverter with voltage space vector pulse width modulation (VSVPWM) technology. Traditionally, BLDCM is driven by six-step inverter with digital Hall sensor feedback, and has the property of trapezoidal back EMF. However, this paper presents an approach to generate a quasi-sinusoidal voltage source...
This paper deals with a comparative study between Proportional Integral (PI) and Sliding Mode in control of a doubly fed induction generator to feed power to the grid. Modeling of the DFIG in d-q frame reference is presented and the field-oriented strategy is applied. We use PI and sliding mode techniques respectively to control the rotor side converter (RSC) and the grid side converter (GSC). Simulation...
Axial flux PM machines, featured by compact size and high performance, are suitable for powertrains of electric vehicles. This paper studies the design and control of a totally enclosed axial flux PM integrated- starter-generator system. Torque density and volume benefits from large number of pole pairs when designing PM machines. However, the increased pole pair number decreases the switching-frequency-to-electrical-period...
High power quality, efficiency and cost effective are crucial aspects in industrial applications. Therefore, the four-switch three-phase inverter (4S3P) has been discovered. But it has been known by many performance limitations in the low-frequency region, because of the generation of an unbalanced current due to the fluctuation of the centre tap voltage of the dc-link capacitors. Those drawbacks...
This article focuses on the development of an embedded control scheme coupled to an advanced power electronic amplifier for a Travelling Wave Ultrasonic Motor (TWUM). The operation of TWUMs relies on the formation of a mechanically induced travelling wave on the motors stator. Utilizing a customized full-bridge resonant inverter and a micro-controller that monitors the error between the desired rotors...
The sliding mode control technique applied to the drive control is analyzed in terms of dynamic response and energy saving in a stand-alone network. The drive is equipped with a surface-mounted permanent magnet synchronous motor fed by renewable power through a voltage-source inverter. The design of sliding mode control is presented and it is shown that the developed control eliminates the influence...
Non-Line-Start Permanent Magnet Synchronous Machines (NLSPMSMs) have no damping windings in the rotor and hence cannot start themselves directly to the grid. For applications where a constant speed drive is preferred, NLSPMSMs are required to be driven by the grid. Therefore, inverter aided soft startup and soft stop of such kind of motors are necessary. In this paper, a modified method of switching...
This paper describes a direct power control (DPC) strategy used for a doubly fed induction generator (DFIG) for wind energy system. The system operates in stand-alone (SA) and can connect to the grid through smooth transition. The proposed control structure is capable of regulating the stator voltage and frequency for an isolated load in case of grid outage. Also, when grid is available, it can control...
This paper presents the excitation control of a high speed Switched Reluctance Generator (SRG). The single-pulse control strategy is widely adopted for high speed SRG which discretizes the generator model into a static optimization problem with excitation angles as the control variables. The conventional procedure of finding the optimal excitation angles is divided into two groups, i.e. purely equation-based...
This paper proposes a new Direct Power Control (DPC) strategy for a single Voltage Source Converter (VSC) based Doubly Fed Induction Generator (DFIG) by employing Four Switch Three Phase Inverter (FSTPI) instead of Six Switch Three Phase Inverter (SSTPI). Reduce number of active switch not only improves reliability but also decreases cost, and conduction losses. The new switching table for FSTPI is...
This paper presents a modified hysteretic controller to improve Direct Torque Control (DTC) of the Doubly-Fed Induction Generator (DFIG) to achieve constant switching frequency and reduced torque and flux ripples. The proposed controller generates appropriate voltage vector with variable magnitude and angle, in order to reduce those ripples. The Space Vector Modulation is employed to apply the reference...
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