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Active filters represent one of the most performant solutions for improving power quality in distribution networks. The development of active distribution grids imposed new requirements for active filters, as they are installed in points of common coupling (PCC) and considering that the grid parameters can change in time. In the paper a thoroughly approach of the measurement chain and associated uncertainties...
Most of the turbine-generator groups using renewables as primary energy (small hydro plants or wind farms) do not optimally provide the electric power when they have to operate at constant speed in order to supply the electric energy at the rated frequency. In this paper a solution that enables such a generator to operate at highest possible efficiency, i.e. at variable speed, is presented. An ac-dc-ac...
In this paper is presented a solution for optimal operation of the Francis turbine, the most used hydro energy converter in small hydro plants. As the efficiency of this turbine is highly dependent from the water flow, which generally has a large variation, variable speed operation was chosen. Due to the fact that all hydro generators are AC machines, the connection to the 50 Hz power grid can be...
The paper presents a variable speed solution for optimal operation of a group of small water turbines integrated in a medium voltage AC grid. As the efficiency of hydro machines is dependent on the water flow, which usually exhibits a large variation, operation at variable speed is considered. Due to the fact that all hydro generators are AC machines, the connection to the 50 Hz power grid can be...
A low power factor and an increased harmonic content are some of the negative effects of the nonlinear loads and power electronics converters. In order to mitigate these effects, active power filters with complex current loops together with appropriate current control strategies are proposed. In this paper a new method to generate the reference current using a recursive algorithm is presented. Due...
Low power factor and increased current harmonic content are some of the negative effects of static power converters usage. To correct these disadvantages, active power filters with complex current control schemes can be used. This paper proposes an new method for tuning the resonant controllers also known as proportional sinusoidal-signal-integrator (P-SSI) controllers, based on Naslin polynomials...
In the paper, a new approach on the model of the broken rotor bars and rotor rings of the induction generators used in micro hydro power plants is proposed. Any physical asymmetry of the rotor, as a broken bar or a broken ring directly affects the stator current and the machine torque by distorting the corresponding waveforms. The analysis of simulation results and experimental data obtained for different...
A DC grid with different type of generators and load is presented. It is considered an islanded and grid connected operation. A low voltage laboratory model is simulated and tested and is expected in the future the results to be extended to high voltage applications. It is demonstrated that the solution can have not only scientific but also commercial viability.
The exploitation of renewable sources is expected to become the most promising solution to the environmental issues and to the permanent increase of prices of the fossil energy. Since most of renewable energy sources are widely distributed and the energy converters generally do not provide electric power at main grid frequency and voltage, a DC bus is suggested to be used for integrating them into...
Active power filters have been intensively explored in the past decade. Various topologies and control schemes have been documented aiming at reducing the cost and improving the performance of the compensation system. Hybrid active filters inherit the efficiency of passive filters and the improved performance of active filters, and thus constitute a viable improved approach for harmonic compensation...
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