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EPE Journal Volume 24-1 - Papers
- Single Inverter Configuration for Simultaneous Dual Frequency Induction Hardening with Independent Control
- A Novel Parallel Control of Best Weight CMAC and PD for Electric Load Simulator
- LED Lamp Power Supply without Electrolytic Capacitors based on Integrated Double Buck-Boost Converter Operating in Full DCM
- Reduced Saliency PMSM V/f Sensorless Control with Initial Rotor Position Estimation
- Design of Star-Connected Autotransformer Based 24-Pulse Rectifier and Its Application in the More Electric Aircraft
- Connection and Disconnection Transients for Micro-Grids under Unbalance Load Condition
EPE Journal Volume 24-1 - Editorial
By Frédérick Bordry; Alfred Rufer; Jean-Paul Burnet; Drazen Dujic
It is our pleasure to announce that the 17th Conference on Power Electronics and Applications, EPE’15-ECCE Europe, will take place in Geneva, Switzerland.
EPE Journal Volume 24-1 - Papers
By S. Porpandiselvi; N. Vishwanathan
Induction hardening is used to heat and harden different parts of components with different size and shape. Components with non uniform surface like gears require different frequencies, a low frequency to heat inner core and a high frequency to heat the outer surface. It is desirable to apply these low and high frequency currents simultaneously for proper hardening of gear. This paper proposes a single inverter topology with a load resonant circuit with independent and simultaneous control of low and high frequency currents through the load coil. The load circuit is a combination of two series resonant circuits which operates at the desired low and high frequencies. Asymmetric duty cycle control technique is used to achieve power control.
By Huatao Han; Bo Yang; Yuying Tai
This paper considers a novel parallel control algorithm of Best Weight CMAC (Cerebella Model Articulation Controller) and PD (Proportional Derivative) for the actuator electric load simulator of Unmanned Aerial Vehicles (UAVs). Although the conventional parallel controller can effectively reduce loading error and restrain the surplus torque of load simulator, it could destabilize the system due to overlearning of CMAC when tracking continuously variable loading signals like sinusoidal instructions. The overlearning issue of CMAC is investigated in detail and its divergent trend is predicted. A novel weight updating rule of CMAC, Best Weight Method, is proposed and its convergence is theoretically analyzed. This novel parallel controller can not only retain the normal learning process of conventional parallel controller, but also avoid the overlearning of CMAC. The experimental results have demonstrated that the proposed controller has good robustness, can effectively reduce the loading error, eliminate the surplus torque and assure the stability of system as well.
By J. M. Alonso; D. Gacio; M. A. Dalla Costa; M. F. da Silva; F. Bisogno; R. N. do Prado
In this paper the integrated double buck-boost converter (IDBBC) operating with both stages in discontinuous conduction mode (DCM) is analyzed. The converter is intended to supply high-voltage LED lamps from the mains, typically in street lighting applications. A high input power factor is assured by operating the first stage in DCM, thus complying with current harmonic injection standards. In this work, the second stage is also operated in DCM as an option to the continuous conduction mode (CCM) that has been studied in a previous paper. The behavior of the converter with both stages in DCM is compared with that of the converter operation with the second stage in CCM. It is demonstrated that with both converters operating in DCM the filter capacitances are reduced even further, allowing for the use of long-life non-electrolytic capacitors. A laboratory prototype to supply a 70 W LED lamp with nominal voltage of 200 V from a 230 V/50 Hz mains maintaining the same design conditions as in the previous work is presented. A comparison of both prototypes is also carried out.
By P. Sala-Perez; M. Heaxts-Aragones; S. Galceran-Arellano; D. Montesinos-Miracle
An initial rotor position estimation method without any position sensor for reduced saliency PMSM is presented. The algorithm is used in combination with a stabilized scalar control. An oscillating high-frequency voltage signal is injected at standstill to estimate the magnet pole position and after that voltage pulses are injected in the corresponding direction in order to detect the rotor polarity. Experimental results have shown the validity of the algorithm for a commercial reduced saliency motor.
By Li Weilin; Zhang Xiaobin; Li Huimin
Power quality is one of the challenging issues toward future more electric aircraft (MEA). In this paper, the authors presented a solution based on the application of a star-connected autotransformer based 24-pulse rectifier. Analysis and development of the proposed 24-pulse rectifier and the simplified MEA power system structure have been done in MATLAB/SIMULINK prior to the experimental implementation. Both simulation and experimental results are presented to validate the developed design procedure and the simulation models. The proposed autotransformer-based rectifier has resulted in elimination of less than 23rd harmonic in the supply current. As a result, the supply current is near sinusoidal in shape with low total harmonic distortion (THD). Moreover, the power factor is also improved to nearly unity in the wide operating range of permanent magnet motor loads in MEA. Thus the proposed 24-pulse rectifier is ideally suited for retrofitting with existing motor drives in MEA.
By J. Rocabert; Gustavo M.S. Azevedo; I. Candela; A. Luna; F. Blaabjerg; P. Rodriguez
In this paper the design and the implementation of a method oriented to carry out a safe and a stable intentional disconnection, and re-connection, of local micro-grids from the main distribution network under generic grid conditions, avoiding the appearance of undesired transients, will be presented. In this work a seamless transfer between grid-connected and isolated mode is achieved by means of using an adapted frequency based synchronization control loop, which works in the ab stationary reference frame, whose response can be dynamically adapted in function of the micro-grid operating conditions. In addition to this feature, the inner loops of the control algorithm proposed in this application have been implemented in order to provide a proper operation of the system under generic conditions, even in the presence of unbalanced loads. In order to prove the reliability and good performance of the proposed method simulation and experimental results will be provided and discussed in the last sections of the paper.
EPE Journal Volume 24-1: Other
By B. Sneyers
EPE'15 ECCE Europe: Call for Papers, written by B. Sneyers
By B. Sneyers; M. Doppelbauer
EPE'16 ECCE Europe: 1st Announcement, written by B. Sneyers and M. Doppelbauer