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An improved quasi-z-source dual-inverter for open-end winding induction motor drives is presented in the paper. The improved quasi-z-source dual-inverter can not only realize boost/buck function, but also suppress DC-link bus overshoot voltage, which is suitable for medium/high-power level. The topology allows shoot-through state, so that the dead-time effect cannot be existed. The dual-inverter belongs...
Modular multilevel converter (MMC) has been a research hotspot in the past decade in the high-voltage high-power applications. The basic working principle is analyzed in depth in this paper firstly. A precise control law is deduced to control the output voltage and the circulating current directly and precisely. Different from the conventional control law, arm inductor voltages are considered in the...
This paper establish the mathematical model of VIENNA rectifier in d-q synchronous reference frame, after analyzed the variables' relationship and all of the switches on-off states and then proposed a novel scheme for fast response of VIENNA rectifier. And transfer the result signal into a-P coordinate to analyze the relationship of the signal. At last changing the components to achieve faster response,...
This paper studies the fault tolerant control schemes for the active neutral-point-clamping three-level (ANPC-3L) inverters under different fault conditions. The fault conditions include the device-level faults in one inverter leg, the inverter-leg faults, and the open-circuit faults in load. The impacts of faults in devices, inverter leg and load on output voltage levels and mid-point voltages of...
Conventional model predictive power control (C-MPPC) requires a large amount of calculations, which is an obstacle for its application, especially in the multilevel converters. To solve this problem, this paper presents an efficient MPPC (E-MPPC) for three-level AC/DC converters by eliminating the complicated power predictions. As a result, the execute time and computational burden are reduced significantly...
In the electric vehicle(EV) system, the Technology for the efficient operation of a battery is one of the most important technologies. By the voltage difference between the cell and between modules of electric car battery, it will not be able to efficiently use the battery. Using the voltage balancing method to each of the battery modules to increase the available space for the battery module, it...
This paper proposes current-fed two-inductor bi-directional DC-DC converter using resonance(CF_TIBCR) for high efficiency and high step-up applications. Conventional dual half bridge(DHB) converter have problems of high voltage spikes and unavailable charge/discharge resulting from uni-directional converter. Hence, operating frequency and the efficiency are also limited. To solve these problems and...
In this paper, a study of dynamic torque ripples using an integrated simulation model of Brushless DC (BLDC) motor and drive systems is presented. An accurate simulation-based model of a BLDC motor based on Phase-Variable approach considering the effect of structural saliency is described. The proposed integrated motor drive model is developed in MATLAB Simulink, which allows drive system designers...
To prevent failures of a rolling bearing in the gearbox drive system, acceleration sensors are used to detect fault-related signals of the bearing. It is a big challenge to observe and identify signals caused by bearing defects in the time domain or the frequency spectrum by a conventional Fourier analysis. The time-frequency representation of the fault-related signals implemented by the windowed...
Electromagnetic response of induction motors to torsional vibration is studied using space-vector and finite element (FE) models. Comparison of the results shows that the skin effect in the rotor bars plays an important role and the basic space-vector model has to be updated to a double-cage or triple-cage model. The results of the higher order models agree well with those of the FE analysis as long...
High-frequency leakage current in PWM inverter-fed AC motor drive systems is a major cause of the EMI problems, which can affect the operations of nearby equipments. This paper presents a study on leakage current mitigation by the use of an active EMI filter. This filter has simple structure, composing of only two parts, a common-mode current transformer for leakage current detection and an amplifier...
The hardware and control algorithms of low cost scheme for integrated dual AC motor drive system with the function of a rectifier to perform as single-phase on-board electric vehicles (EVs) integrated battery charger are presented in this paper. In the system, a five-leg inverter is proposed; two legs are for the auxiliary motor, three are needed for the main traction motor. Both motors are three...
In this paper, a comparison between the proposed level-shift and the phase-shift duty-cycle modulations, based on the continuous carrier-based space vector pulse width modulation (SVPWM) via the ac and dc components injection technique, is presented. The dual techniques are selected to overcome the output voltage distortion of the nine-switch inverter caused by the cross-over of the duty-cycle modulating...
This paper introduces a sensorless current-sharing strategy for two-phase input-parallel output-parallel (IPOP) DC-DC converters. A dual active bridge (DAB) DC-DC converter is chosen as the basic DC-DC converter. With this strategy, the parameter mismatches between phases are estimated by perturbing the duty cycle in one phase and measuring the changes of duty cycles in both phases. Then the duty...
This paper presents a method of designing the phase locked loop (PLL) for rotor speed estimation. The transfer function from the torque current to the estimated rotor speed is derived and is compared with that from the torque current to the real rotor speed. The damping ratio of the PLL is selected to make the two transfer functions as close to each other as possible. A first-order filer is further...
The rotor shape of external rotor surface permanent-magnet machine (SPM) substantially affects the induced voltage, the iron losses and the torque ripple, which are importance machine performances. This paper proposes a rotor design method to optimize these motor performances, by using rectangular magnet without complex shape. According to the rectangular magnet, a non-uniform air gap is obtained,...
The modular multilevel converter (MMC) mainly run at power frequency (50 or 60Hz) especially in the field of HVDC field. The disadvantage of cell capacitor voltage fluctuation at low frequency blocks the kind of convertor applied at AC motor drive. This paper uses a set of control novel scheme to restrain the fluctuation and make MMC to drive induction motor running from standstill to grid frequency.
In this paper, a new control strategy based on the passivity-based control theory of Euler-Lagrange (EL) systems is proposed for a single-phase three-level inverter. The proposed regulators are based on an energy shaping and damping injection scheme. Since the passivity-based methodology is a nonlinear approach, excellent transient response and global stability can be assured under large perturbations...
High speed permanent magnet motor (HSPMM) has the advantages of connecting with the load directly and getting rid of traditional mechanical increasing gear. Therefore, HSPMM is being more widely used in the industrial application and aerospace aspect recently. Inner rotor structure is generally adopted in traditional HSPMM, and in order to avoid enormous tensile stress of PM, special rotor protecting...
This paper proposes the design method on the notch structure of stator tooth to reduce the cogging torque of the single-phase brushless Direct Current (BLDC) Motor. The single phase BLDC motors generates the dead-point causing a starting failure. This problem is solved by using an asymmetric air-gap structure. However, the asymmetric air-gap structure increases the cogging torque causing a noise and...
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