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Power generation characteristics of two generator systems consisting of a permanent magnet synchronous generator and diode bridge rectifiers are discussed in this paper. One of the discussed systems has three-phase stator windings, and the other has two sets of three-phase (six-phase) stator windings to reduce pulsation in the electromagnetic torque and DC current. Experimental results reveal that...
Characteristic analysis of a 2MW wind power system with doubly-fed induction generator (DFIG) is carried out. In the analysis, tower shadow effect that occurs in case of downwind turbine remarkably is considered. Tower shadow effect is modeled as a variation of the output power. Stator-field-oriented vector control is applied to the control system in order to compensate the variation. Furthermore,...
In this paper, the advanced electric technologies for grid power integration of different offshore wave energy conversion devices are presented. The electrical connection configurations for integrating the electric power of the multi wave energy conversion devices such as the Oscillating Water Column, Pelamis, the Wave Point Absorbers and the Wave Dragon are developed by employing the most efficient...
A sensorless control strategy for a permanent magnet synchronous generator (PMSG) in variable speed wind energy conversion system (WECS) is proposed. The proposed method is based on recursive least square estimation (RLSE) algorithm for rotor speed estimation using an equation containing only stator flux and current. Further, rotor position information used for coordinate transformation is computed...
Rare earth permanent magnet (PM) materials are used in interior permanent magnet synchronous motors (IPMSM) as mainstream motors in hybrid electrical vehicles (HEV). In mass produced HEVs, the steep rise of price for the recent rare earth materials like Neodymium, Dysprosium, Boron, and etc is one of serious concerns. Therefore, a switched reluctance motor (SRM) without permanent magnets is one of...
In this paper the design for the 2004 Prius electric drive machine is investigated in detail to assess its characteristics. It takes the form a fluid-cooled interior permanent magnet machine. This information is used to generate a complete operating profile. This information is then utilized to produce a design for an alternative induction motor. The specification is found to be demanding however...
This paper proposes a new generalized speed-varying ellipse voltage injection method for sensorless drive of PMSMs. The injected high-frequency voltage has unique spatially-rotating ellipse-shape, whose both amplitudes of the major and minor axes vary dependently of the motor speed. Although the voltage shape can be designed through selecting a design parameter, the associated high-frequency current...
Stand-alone power systems (SPS) are attracting more and more interest with the global movement toward the distributed generation. Due to their disconnection to the power grid, they are suffering from poor load following capability under load variations. In order to solve this problem, this paper provides an AC power solution based on flywheel energy storage. The proposed flywheel system is characterized...
This paper proposes a control method suitable for limited armature voltage and current in a permanent-magnet synchronous motor drive system based on direct torque control. First, this paper proposes torque-limiting and flux-weakening control that is suitable for a direct torque control based motor drive system. The proposed method utilizes a mathematical model in a rotating reference frame synchronized...
This paper presents novel high-frequency signal injection-based self-sensing methods for four-phase switched reluctance machines. The methods cover full magnetic operating range of the drive including saturation and show compensation methods to improve the rotor position estimation under saturation. The effects of magnetic saturation on machine saliencies are studied and modified carrier signal injection...
Current regulation is an essential part of many AC drives and power converters, with fast and accurate measurement of the current being essential for this purpose. High frequency harmonics, which are always present in power converter systems, can produce aliasing phenomena if the signals from the current sensors are not adequately processed and sampled. Synchronous sampling is a mean to reduce the...
The authors proposed a high power and low vibration novel segment type switched reluctance motor (SRM), but it had a problem of large torque ripple. We also proposed the novel segment type SRM with a 2-steps slide or skew rotor to reduce the torque ripple. We produced the experimental machine and measured the characteristics. The average torque was decreased slightly in comparison with the non slide...
This paper proposes an outer-rotor-type permanent magnet motor for electric scooter propulsion systems. The designed motor is integrated into the wheel rim on the tire and meets the specifications of the electric scooter. The simulation using non-linear finite element analysis (FEA) method results match experimental data obtained from the prototype 20-poles motor for electric scooter propulsion systems...
We have proposed a q-axis flux observer based speed sensorless vector control for induction motors with stator resistance identification. A linear model of proposed system is derived and the trajectories of poles and zeros are shown to study the stability limit. A simulation program is developed including the effects of discrete algorithm of proposed method, PWM mechanism and the characteristic of...
Multi-cell inverter include an array of singlephase inverters capable of handling higher voltage ratings with lower rating power electronics devices. In this paper, a Real Time Digital Feedback Controller (RTDFBC) combined with a Repetitive Controller is proposed to control a Variable Frequency Drive (VFD) fed by a multi-cell inverter. This digital control is characterized by a very fast transient...
The goal of this paper is utilization of the state observer to research a new capability of controlling the axial gap self-bearing motor. Analytical and experimental evaluation for a sensorless speed vector control of a salient axial gap self-bearing motor is presented. The approach is based on the estimation of the extended electromotive force (EEMF) through a Luenberger Observer (LO) with help of...
In this paper, Direct Torque Control (DTC) algorithms for dual three-phase induction motor fed by six phases Voltage Source Inverter (VSI) is described. The induction machine has two sets of three-phase stator windings spatially shifted by arbitrary angle. The machine dynamic model is based on the vector space decomposition theory. Optimal switching strategies to control the machine for different...
This paper presents a sensorless direct torque control method for matrix converter fed interior permanent magnet synchronous machine. The matrix converter is split into rectifier and inverter stages based on the Indirect Space Vector Modulation theory. Therefore, the hysteresis flux and torque control is achieved by selecting one of the six active and two zero voltage vectors in the inverter stage...
A Novel model reference adaptive system (MRAS) based speed estimation technique is presented in this paper. The speed estimator utilizes instantaneous and steady state values of V⃗* × I⃗ in the reference and adjustable models of the MRAS respectively. The major advantages of this method are: (i) flux estimation is not required and (ii) the method is stable in all the 4-quadrants of operation. The...
Elevated frequencies in high-speed ac machines increase the skin effect in stator windings, making it necessary in many cases to divide each phase winding into high numbers of small-diameter strands connected in parallel. Unfortunately, circulating currents among the strands in a single bundle can significantly increase the total copper losses depending on several factors including the twisting (i...
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