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With ever-increasing concerns on clean environment and global warming, there is special interest in electric vehicles (EVs) to be used instead of conventional vehicles with internal combustion engines (ICEs). Among competing machine types, permanent magnet (PM) brushless motor is the most commonly employed motor type for this technology due to their important advantages of high power density, high...
This paper introduces space vector modulation (SVM) schemes for reducing the common mode voltage (CMV) of a direct three-to seven-phase matrix converter (3×7 MC) fed a seven-phase induction motor. The proposed techniques are based on the indirect SVM (ISVM) in which the 3×7 MC can be modeled as a three-phase rectifier followed by a seven-phase inverter. The CMV reduction is achieved by suggesting...
Many mathematical models have been developed to describe the dynamic behaviour of induction machines and have been utilized in induction machines parameter identification. In some cases, model parameters may not be uniquely estimated, regardless of the used algorithm and the quality and quantity of the used measurements. This non-identifiability is related to the structure of the model itself. In...
The interest in multiphase drives has been steadily growing during the last decade due to the promising potentials offered by multiphase machines over conventional three-phase counterpart. In this context, six-phase induction machines are preferably used in many diversified high-power applications. Generally, thanks to its improved flux distribution, the asymmetrical six-phase winding topology fed...
Minimizing the number of active switching devices in switched-mode power-electronic systems has a significant importance. Reduced complexity and switching losses, low cost, weight, and volume and high reliability are the main merits gained from implementing such reduced switch-count systems. To this end, this paper proposes a new three-phase dc-ac power converter topology for diversified applications...
This paper illustrates the assessment between the multiloop control strategies that aim to damp the resonance hazard of LCL-filters and expanding the available stability margins. The establishment of the multiloop control is sustained in a sensorless manner with the reconstruction of the state variables using the Kalman observer, thus enhancing the cost measures and reliability of the distributed...
Recently, reduced switch-count converters have garnered exceptional attention in power electronic systems due to the diversified advantages such as low cost, low weight and volume, and high reliability offered by them. In this paper, a novel design of single-phase inverters with a reduced number of switching devices is proposed based on the single-ended primary-inductance converter (SEPIC). The proposed...
The control of power electronic converters is subjected to several challenges as measurement sensors drift, malfunction in harsh environments, non-ideal grid, and performance degradation due to the delay of discrete control systems. In this paper, a stationary frame resonant current controller for inverter-based distributed generation (IBDG) with sensor-less grid voltage operation is proposed. The...
Four-switch three-phase (FSTP) inverter has been proposed as an innovative inverter design to reduce the cost, complexity, size, and switching losses of the DC-AC conversion system. Traditional FSTP inverter usually operates at half the DC input voltage, hence, the output line voltage cannot exceed this value. This paper proposes a novel design for the FSTP inverter based on the topology of the single-ended...
One of the main issues accompanied with the high penetration of PV distributed generation (DG) systems in low voltage (LV) networks is the overvoltage challenge. The amount of injected power to the grid is directly related to the voltage at the point of common coupling (PCC), which necessitates limiting the amount of injected power to the grid to conservative values compared to the available capacity...
This paper proposes a novel single layer winding layout for a permanent magnet machine with improved torque density for electric vehicle applications. In this paper, two permanent-magnet (PM) machines with outer rotors and single layer fractional slot concentrated windings are compared based on two different slot/pole combinations, namely 20 slots/18 poles and 20 slots/22 poles. The two machines are...
Modular Multilevel converters (MMC) have become one of the most promising topologies for DC-AC conversion in recent years. Capacitor voltage balancing is a vital issue for proper operation of the MMC. Generally, conventional sensor-based balancing techniques require a significant amount of measurements, 2m(N-1) voltage sensors and 2m current sensors are required for a N-level m-phase converter. In...
Z-source inverter (ZSI) is recently proposed as a single-stage power conversion topology. It adds voltage boost capability for complementing the usual voltage buck operation of the traditional voltage source inverter with enhanced reliability. However, its boosting capability could be limited, and therefore, it may not be suitable for some applications requiring very high voltage boost. To enhance...
Three-phase current source inverter (CSI)-based induction motor (IM) drives are attractive in MV applications since they feature a simple inverter structure, a lower switching dv/dt, and a reliable short circuit protection. Although multiphase machine topic, especially the five-phase one, gains considerable interest recently in literature, almost all the applied control methods are targeting voltage...
Recently, magnetic gearboxes (MGBs) are serious contenders to their conventional mechanical counterparts in terms of reduced maintenance requirements, improved reliability, tolerance to mechanical inaccuracies, and inherent overload protection. MGBs are preferably employed in high speed applications and compact harsh environments. One of the challenging design aspects of MGBs is the proper selection...
Energy storage systems have become an essential part of power utilities due to their capability of providing high level of power quality and stability. Flywheel energy storage systems (FESSs) are now employed with numerous grid and renewable energy applications due to their operational merits. Some of these applications are related to fault ride-through and critical load support. Therefore, the reliability...
Due to the large variety of renewable power sources, power electronics play an important role in energy conversion. Different power converter topologies are used to interface distributed power generation systems (DPGS) with the utility network. Introduction of power electronics for DPGS provide several advantages such as energy optimal operation by employing a control algorithm to extract the maximum...
Permanent magnet (PM) vernier machines have shown promise in electric vehicle applications as they offer high torque density and low speed/high torque operation by introducing flux-modulation poles that modulate the high-speed armature rotating field and the low-speed PM rotor field. The non-overlap single layer windings provide a cost-effective design variation that eases manufacturing, reduces torque...
The development of static power converters capable of transforming DC energy obtained from alternative sources into AC has become one of the main challenges in renewable energy systems. In this context, the buck-boost inverter is advantageous for being capable of providing an AC output voltage higher or lower than the input DC voltage in a single power conversion stage. In this paper, a controller...
Due to the rapid growth of the electric energy demands, the necessity of involvement of distributed generation (DG) to overcome this demand became a must. When distributed generation renewable energy sources are coupled to the grid through a DC-AC inverter, the injected currents to the grid should be characterized by high quality and low distortion. Many factors play an important role to produce high...
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