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There are big ripples on current and electromagnet torque under traditional hysteresis direct torque control (HDTC) on motor drive system. To solve these problems, a two dimension cloud model controller is designed to instead traditional hysteretic comparator in this paper, and zero voltage vectors are used to further reduce ripples. The torque error, the flux error and stator flux position are used...
In this paper, we present a variable speed wind induction generator associated to a flywheel energy storage system. Direct torque control strategy for an induction generator used in the flywheel energy storage system, is applied. Both rotor flux and DC bus voltage are regulated by the applied of the standard switching table for an operation in the 4 quadrants. This system is used for improving the...
This paper aims at the application of a half bridge DC-DC converter as a power factor correction (PFC) converter for a permanent magnet brushless DC motor (PMBLDCM) driven air conditioner. This PFC converter is fed from single-phase AC mains through diode bridge rectifier (DBR) and connected to a voltage source inverter (VSI) feeding the PMBLDCM. The proposed PFC half-bridge converter based PMBLDCM...
In this paper, various dynamic slip control topologies are proposed for the control of grid connected opti-slip induction generator (OSIG). An elegant technique based on rotor voltage measurement has also been presented for mitigating output power fluctuations from OSIG, due to sudden wind gusts, tower shadow effect, etc. The control of OSIG is achieved using the basic principle of chopper control...
This paper proposes a new speed sensorless direct torque and flux controlled interior permanent magnet synchronous motor (IPMSM) drive. Closed-loop control of both the torque and stator flux linkage are achieved by using two proportional-integral (PI) controllers. The reference voltage vectors are generated by a space vector modulation (SVM) unit. The drive uses an adaptive sliding mode observer for...
This paper proposes an improved current control scheme for the rotor-side converter of a doubly-fed induction generator (DFIG) wind power generation system. The control scheme consists of a proportional (P) controller and a harmonic resonant (R) regulator tuned at the grid frequency. Thus, the positive and negative sequence components of rotor current are fully regulated by the PR controller without...
High speed compact BLDCM (Brushless DC Motor) is much used for a robot and medical application because of the high torque and high speed characteristics. This paper presents a simple PLL based speed control scheme for a high speed compact BLDCM. Without any complex calculation of actual speed and design of speed controller, a simple phase difference between reference and actual hall sensor signal...
This paper presents the design and analysis of comprehensive control system of a fuel cell which is directly connected to a DC motor. The fuel cell system consists of a 63-cell 300 W proton exchange membrane fuel cell (PEMFC), a 3-cell lead-acid battery and a conventional DC machine. The comprehensive controller design and analysis of the fuel cell are presented, including the design of the PEMFC...
The starting current is big and the torque is small when the motor begins to start with the nominal voltage .The discrete variable frequency method can solve the above two questions, at the same time brings the torque oscillation.The paper analyses the cause in detail, and then presents the solved method: the combination between discrete variable frequency method improvement and power factor closed...
This paper describes the optimal control of variable-speed permanent magnet synchronous generators system. In order to maximize generated power, permanent synchronous generator is controlled by a maximum power point tracking (MPPT) control and maximum efficiency control. A sensor-less scheme is proposed for MPPT. Experimental results have been carried out to verify the benefits of the proposed system.
A novel V/F induction motor control system based on stator voltage oriented method is presented. This scheme includes dead time compensation, stator voltage compensation and anti-oscillation regulation, which can greatly improve the V/F systempsilas performance especially low frequency load capability and fast response capability. Different from conventional V/F methods, all the compensation and regulation...
Direct torque control based on space vector modulation (SVM-DTC) preserve DTC transient merits, furthermore, produce better quality steady-state performance in a wide speed range. In this paper, a torque fuzzy logic controller was designed to substitute the original torque PI controller, and a fuzzy SVM-DTC system based on the torque fuzzy controller was given. A new integration algorithm for estimating...
Direct torque control of brushless DC motor (BLDC) is complex for turn-off phase. And the direct torque control of brushless DC motor based on hyper space vector solved the problem, however, the torque ripple was obvious. A modified method is presented in this paper in order to reduce the torque ripple based on hyper space vector. For the turn-off phase only affects the stator flux linkage but not...
In this paper, a novel passive boost converter for SR drive with high demagnetization voltage is proposed. A simple passive circuit is added in the front-end of conventional asymmetric converter, which consists of three diodes and one capacitor. Based on this passive network, the two capacitors can be connected in series or parallel in different operation status. So the terminal voltage of the converter...
A novel sensorless control for switched reluctance motor (SRM) driven by the three-phase full-bridge inverter is proposed. The most commonly used drive for SRM is the asymmetric half-bridge inverter but its main disadvantage is the cost due to the number of switches and diodes required to realized the drive, in comparison with the much cheaper and more widely available three-phase full-bridge inverter...
This paper presents the analysis and operation of doubly fed induction generator (DFIG)-based wind power generation system under unbalanced network voltage conditions. The limited voltage and current ratings, the control capabilities of both the grid-side and the rotor-side converter (GSC & RSC) for unbalanced network voltage compensation are investigated in detail. A new current control scheme,...
The V/F controlled induction motor driver systems always suffer from middle frequency oscillations under light load conditions. Many methods were sponsored but always complex and parameters dependent. This paper present one simple and reliable method which can improve the systemspsila stability: First, one efficient dead-time compensating method was present, which can reduce the distortion of phase...
To make a comprehensive experimental research on new-type of transverse flux permanent magnet machine (TFPMM), the synchronous machine vector diagram is adopted to seek an optimal control strategy. Simulations and experiments are operated and the results show that the conventional control strategy id=0 is suitable to TFPMM very well.
To compensate the voltage imbalance of the two split dc-link capacitors in a four-switch three-phase inverter fed direct torque control system, a modified space vector modulation (SVM) approach is proposed in this paper. The theory, design, and implementation of the modified SVM based DTC are discussed in detail, a new sector division method based on the real basic voltage vectors is introduced and...
This paper presents the dynamic modeling, prediction, control and experimental aspects of a switched reluctance starter/generator (SRS/G) system. The proposed model utilizes the Fourier series in expression of current dependent arctangent function to characterize the relationship among phase current, rotor position, flux linkage and torque characteristics. Second, a simulation model along with their...
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