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EPE Journal Volume 16-1 - Papers
- Voltage Sag Response of PWM Inverters for Variable-Speed Wind Turbines
- Evaluation of Wind Farm Layouts
- A Current-Source Active Power Filter with a New d.c. Filter Structure
- Diode Recovery Characteristics Considerations for Optimizing Performance & Cost of Continuous Mode Boost PFC Converters
- Vector Control of an Induction Motor Fed by a PWM Inverter with Output LC Filter
- Fuel Cells for Electric Power Generation: Peculiarities and Dedicated Solutions for Power Electronic Conditioning Systems
EPE Journal Volume 16-1 - Editorial
By M. Jufer
The election of a new EPE Association President is the occasion for a reflexion on the future of this association.
By T. Undeland
The short history of NORPIE....
EPE Journal Volume 16-1 - Papers
By R. Ottersten; A. Petersson; K. Pietiläinen
The voltage sag response of PWM inverters is analyzed for a candidate dc-link voltage control system. It is shown that the voltage sag response is mainly determined by the dynamics of the dc-link voltage and the control system. PWM inverters are found to be robust against voltage sags, but the remaining grid voltage limits the maximum active power that can be delivered to the utility grid.
By S. Lundberg
In this paper, layouts of various large-scale wind farms, using either AC or DC to transfer the generated power, are investigated. The criterion used to evaluate the different layouts is the energy production cost, which is defined as the total investment divided with the total energy production of the wind farm. To determine the energy production and the total investment, loss and cost models for the components in the wind farm are used and the most important ones are presented in this paper.
The investigation shows that a wind farm with series connected DC wind turbines seems to have the best potential to give the lowest energy production cost, if the transmission distance is longer than 10-20 km.
By M. Salo
The main drawback of the current-source active power filter is the heavy and bulky d.c. side filter. The large d.c. filter is needed to store the energy of the compensated harmonic components. In this paper a new smaller d.c. filter structure is proposed for the current-source active power filter. In the presented d.c. filter structure the energy of the most important harmonics are stored in resonant circuit which makes it possible to decrease the overall size of the filter. The function of the proposed dc filter structure is examined with both simulations and experimental tests.
By S. Basu; T. Undeland
This paper explores ways, including the use of SiC diodes, to increase the efficiency and switching frequency of continuous mode Boost PFC Converters. The dependence of electrical and thermal performances of these PFC circuits on the characteristics of the power switching devices is studied. By making measurements on a practical 1000 W PFC circuit prototype, this paper shows as to how every specific application would need an unique design solution to optimize the cost and performance of a PFC circuit.
By J. Salomäki; J. Luomi
This paper introduces a control method for an induction motor that is supplied by a PWM voltage source inverter through an LC filter. A cascade control structure is employed and a full-order observer is used to estimate the system states. Thus no additional voltage or current measurements are needed for the vector control of the motor. Two alternative methods are presented for the observer gain selection. Simulation and experimental results confirm the functionality of the proposed control method.
By F. Profumo; A. Tenconi; M. Cerchio; R. Bojoi; G. Gianolio
The Fuel Cells (FCs) output power is usually generated at low DC voltage. The output voltage is not constant and it depends on the operation conditions. Furthermore, the FC dynamic response is slower than the transients typically requested by loads; hence, in many applications, the FC generators must be interfaced with the loads and the other possible energy/power sources. For these reasons, the FC stack output power and/or the batteries/supercapacitors input/output power must be conditioned by means of an electronic power converter. The purpose of the paper is to present the main issues related to the conditioning of FC power output; in particular, considering the specific requirements of the interface electronic converters in the two most important applications: micro distributed generation (or cogeneration) and the transportation systems. The paper mainly discusses the basic circuit topologies of the DC/DC converters dedicated to the FC power conditioning, in particular considering the Proton Exchange Membrane FC technology.