Papers by Keyword: Space Vector Pulse Width Modulation (SVPWM)

Abstract: This paper introduces the SVPWM mechanism firstly and the software and hardware scheme of current loop in servo motor is designed; it also contains the control strategy and the current sampling principle. The dead time compensation problem in the inverter of the motor drive is discussed deeply. In the end, the software realization method of the interruption of current loop is presented in details.

Abstract: Permanent magnet synchronous motor (PMSM) now is widely used in hybrid vehicle drive area. When the space vector pulse width modulation (SVPWM) is used in PMSM control, the stator three phase currents must be collected for its control calculation. In this paper, a PMSM stator current collection system based on C8051F500 and AD7865 is designed, and proved to be effective with experiments.

Abstract: A novel control platform for the permanent magnet linear synchronous motor (PMLSM) drive system has been built up based on virtual instrument (VI) and relavant data acquisition card (DAQ) devices. In the traditional control platform, it mostly depends on digital signal processor (DSP), which needs a lot of time to further develop the interface between the personal computer (PC) and operators, and its computational capability is not strong than computer. To overcome these shortages, a novel control platform is presented on the base of one PC, one LabVIEW, and one multifunctional data acquisition card. Firstly, a space vector pulse width modulation (SVPWM) signal source is executed in the VI. Then in order to improve the precision of control system, the field oriented control (FOC) is proposed for the PMLSM. Finally comprehensive experiments verify with relative simulations.

Abstract: Traditional space vector pulse-width modulation (SVPWM) algorithm included complex calculations like triangle functions and square root, which increased execution time of the program. A novel SVPWM algorithm calculating modulation functions of three phases through stationary αβ components of reference voltage vectors was proposed here to solve the problem, which was composed of only simple four arithmeticoperations. The method simplified traditional SVPWM and improved real-time performance of digital control system. However, dead-time effect still existed in novel SVPWM algorithm. And it will lead to distortions of low speed direct-drive PMSM phase currents, brought increase of speed fluctuation, resulted in unstable operating of servo system. This paper analyzed details of error voltage vectors led by dead-time effect, researched relationship between error voltage vectors and polarities of three phase currents, and put forward a novel dead-time compensation strategy that decreased influence of zero current clamping. Simulation results showed that this strategy can effectively compensate effects of dead-time error voltage vector and improve wave forms of phase currents, which increased operating performance of low speed direct-drive PMSM.

Abstract: Came from the principle of brushless doubly-fed machine, combined the space vector pulse width modulation, modeled bidirectional PWM converter with unity power factor and feed-forward decoupling control using MATLAB/SIMULINK, studied the simulation characteristics, the results confirmed the correctness and effectiveness of the model, and provided reference for further research of the control scheme.

Abstract: The PV grid-connected control system is mainly related to a few key issues that are characteristics of photovoltaic cells, maximum power point tracking and grid-connected control of three-phase inverter. In this paper, simulation analysis and study of the three-phase grid-connected PV system control strategy. The control strategy of the three-phase PV grid-connected system is analyzed and studied by simulative experiment in this paper. First, a mathematical model of solar cells is established, then the algorithms based on perturb & observe to track maximum power point is used; Secondly, the structure of three-phase PV grid-connected system is introduced, and the space vector SVPWM controller is used to control the grid-connected inverter; Finally, the simulative results on Matlab/Simulink software show that SVPWM inverter control strategy is superior to the traditional hysteresis current inverter control strategy, which illustrates the reliability and superiority of SVPWM control strategy.

Abstract: This paper investigates the operation of a PV unit which is connected via a three-phase voltage-source inverter to the grid. The PV grid-connected control system is mainly related to a few key issues that are characteristics of photovoltaic cells, maximum power point tracking and grid-connected control of three-phase inverter. The control strategy of the three-phase PV grid-connected system is analyzed and studied by simulative experiment in this paper. A mathematical model of solar cells is established. Then the algorithms based on perturb & observe to track maximum power point is used. The structure of three-phase PV grid-connected system is introduced, and the current control method with Space Vector pulse width modulation (SVPWM) is examined and compared to other current control methods. The p-q theory is used to achieve uninterrupted compensation of the reactive power of the system. Simulative results on Matlab/Simulink software illustrate the reliability and superiority of this control strategy.

Abstract: Aiming at the problem of the harmonic of the space vector pulse width modulation (SVPWM), the analysis methods to SVPWM are studied. After introducing the principle of SVPWM, the paper discusses the harmonic distortion factor (HDF) that is an important assessing index of the harmonics. The two analysis methods- ripple current method and error triangle method – are discussed, and the relation between them is revealed. Finally, the micro HDF of the random zero distribution PWM (RZDPWM) is computed based on the two methods and analyzed.

Abstract: Space Vector Pulse Width Modulation (SVPWM) technique is one of the best method of PWM variable frequency drive and make the AC motor achieving the performance as good as DC motor. Permanent Magnet Synchronous Motor (PMSM) has many advantages of small volume, steady operation, high energy efficiency, large output torque, etc. To solve the problems of auto environment and energy sources, study on Pure Electric Vehicles (PEV) driven by PMSM based on SVPWM is an important research direction and has the practical value. On the basis of analyzing the basic models of SVPWM, PMSM and PEV, simulation model of PMSM Control System for PEV can be constructed. The results of the simulation show that the control system has super performance and meet the request of system.

Abstract: In order to improve voltage utilization ratio and dynamic performance of frequency converter, this paper presents a digital frequency converter design scheme based on digital signal processor TMS320LF2407A and the theory of space vector pulse width modulation (SVPWM) technology, provides its detailed design measures of software and hardware and SVPWM algorithm realization methods. The experimental results prove that this new frequency converter has simple structure, high control precision, higher voltage utilization ratio, better dynamic and static property.