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In this paper, the current sensorless control for dual-boost half-bridge (DBHB) converter with power factor correction (PFC) function is presented. The short-through problem can be avoided by the dual-boost structure for enhancing the reliability. It also reduces the power dissipation due to the body diodes' reverse recovery current of switches. Furthermore, the intrinsic voltage-doubler characteristic...
Inherent 2nd harmonic resistive and inductive saliencies are generally employed for rotor position estimation of permanent magnet synchronous machine at standstill and in low speed range. However, the resultant estimated rotor position has an angle ambiguity of π due to the lack of magnetic polarity information in these saliencies. Therefore, this paper utilises the high frequency (HF) inductance...
Reliable rotor position/speed estimation is one of the key issues in the position/speed sensorless control of permanent-magnet synchronous machines (PMSM). In this paper, a quasi-sliding-mode observer (QSMO) with an online observer parameter adaption scheme is employed to estimate the extended electromotive force of a salient-pole PMSM. Due to machine parameter variations, inverter nonlinearities...
This paper presents the validation of a MPPT technique, based on a Growing Neural Gas (GNG) network, for high performance marine current generator with induction machine, in presence of torque oscillations caused by time and space variation of the turbine operating conditions. The unsteady torque delivered by a notional turbine working in the presence of waves and of sea bottom boundary layer is obtained...
This paper proposes a speed sensorless technique for high performance induction motor drives based on the retrieval and tracking of the rotor slot harmonic. First, two cascaded ADALINEs (Adaptive Linear Elements) are used to extract the rotor slot harmonic (RSH) from the stator phase current signature, acting as adaptive filters, respectively in configuration band and notch, whose output consists...
In this paper, we propose a new position sensorless drive system for an interior permanent magnet synchronous motor (IPMSM) with maximum torque control. The proposed method is based on extended electromotive force (EEMF) and voltage injection synchronized with a pulse-width modulated (PWM) carrier. In the proposed method, in order to estimate the magnetic pole position using the EEMF, there is no...
In signal injection sensorless drives, the injection voltage can't be reduced under a certain value. The lower limit of the injection voltage mainly comes from the inverter nonlinearity that distorts the injection voltage and degrades the position estimation performance. After analyzing the inverter nonlinearity during the voltage injection, it is revealed that the parasitic capacitances of IGBT switches...
An optimal design of internal Ferrite permanent magnet motor with embedded key FEM verification is presented with the scope to increase the efficiency of the small power motors without to use the expensive, rare earth permanent magnets. Two internal flux concentration topologies are analyzed and the geometric dimensions and performances are presented for three cases, all at 1kW rated power at 4500rpm...
This paper presents a high-speed drive to be used for electrically-assisted turbo charging in an internal combustion engine. The electrification of the turbo-charger system can enhance the performance and reduce the dynamic drawbacks that affect conventional solutions i.e. turbo-lag. However, the design of the electric drive presents some challenges, especially related to the thermally aggressive...
This paper presents a multi motor drive based on a dual purpose energy conversion system with an energy storage. The proposed structure and control are directly applicable for heating ventilation and air conditioning (HVAC) systems adding an energy storage functionality. Based on the new structure, a dual functional control scheme has been introduced to manage the charging/discharging of the energy...
This paper proposes a novel rotor position estimation algorithm for the vector control of the doubly-fed induction generators (DFIGs) in wind power applications. The proposed algorithm uses a sliding mode observer (SMO) to estimate the rotor position information from the stator currents. The estimated rotor position is then used for the position sensorless vector control of the DFIG. The proposed...
In the past, plenty of identification methods have been proposed for the encoderless control of induction machines and of permanent magnet synchronous machines, including all important tasks of the encoderless operation, such as the identification of the initial rotor position, the low and the high speed operation of the drive. However, not all the available methods are suitable for the application...
In this paper a design approach for a sensorless controlled, brushless, interior permanent magnet machine is attained. An initial study based on established electrical machine formulas provides the machine's basic geometrical sizing. The next design stage combines a particle swarm optimisation (PSO) search routine with a magneto-static finite element (FE) solver to provide a more in depth optimisation...
Anti-clockwise pulsating injection method utilising the synergies of both pulsating injection and zero sequence voltage sensing has been proposed to enhance the rotor position estimation of permanent magnet synchronous machine (PMSM) drives. However, the detailed comparisons with the conventional carrier signal injection methods have not been carried out. Therefore, in this paper, for the three types...
This paper analyzes and compares position estimation performances of fundamental-model-based sensorless control methods considering the effects of inverter nonlinearities and parameter estimation errors. Based on the investigation of four conventional sensorless control algorithms, estimated position error from each algorithm is represented in a quantitative manner. This representation is helpful...
There are several problems in the Modular Multilevel Converter (MMC), such as the appearance of circulating current, capacitor voltage unbalance and the requirement for a high number of sensors. All these problems will decrease the reliability and raise the cost/uncertainty of using MMC solutions. As a result, a sensorless control method is proposed in this paper, which targets to improve the performances...
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