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Wind pumped storage systems are becoming more and more attractive in the context of higher quantities of wind power to be absorbed by the grid, power system stability, load balancing and frequency control. The power losses of a pump drive inverter system are evaluated considering two different topologies: 2L VSC and respectively 3L NPC VSC starting from 2.2 kW up to 1.85 MW power levels. The analyze...
Integrating wind energy into the grid may raise stability problems. Solutions for avoiding these situations are studied and energy storage methods are suitable for balancing the energy between the wind turbine and grid. In this paper, an autonomous wind turbine pumped storage system is presented. The focus of this paper is to improve the efficiency of this system, which is small at low power levels...
Energy storage devices and solutions are required for power quality and balance within wind systems. In the context of rapidly expanding of distributed energy sources, the wind energy converters are in the center of interest. In this case, the direct dependence of the power generation capability for a given wind speed represents a major problem of wind energy conversion with regard to large-scale...
The purpose of the paper is analyzing the possibilities of improving the efficiency of a 2 kW wind pump storage system at low wind conditions. Two possible solutions are considered for the converter supplying the induction motor pump system: two-level and respectively three-level NPC inverter. Inverter total power losses are computed based on models proposed in the paper, considering a very low wind...
This paper is focused on control solutions for a single-phase inverter for distributed generation (DG) systems requiring power quality features as harmonic and reactive power compensation for grid-connected operation. Based on these characteristics, a new current reference generator based on sinusoidal signal integrator (SSI) and instantaneous reactive power (IRP) is proposed. Simulation and experimental...
This paper deals with a hybrid power system based on renewable energy sources, working in stand-alone mode. It consists of a micro-hydro plant including a synchronous generator and a wind turbine with an induction generator. A frequency controller, based on dump load and common voltage regulator for the two generators, ensures the system's power balance. The study -including simulations- focuses on...
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