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Connecting renewable power plants to the grid must comply with certain codes and requirements. One requirement is the ramp rate constraint, which must be fulfilled in order to avoid penalties. As this service becomes compulsory with an increased grid penetration of renewable, all possible solutions must be explored especially that large battery energy storage systems are still expensive solutions...
The increasing amount of Distributed Energy Resources (DER) components into distribution networks involves the development of accurate simulation models that take into account an increasing number of factors that influence the output power from the DG systems. This paper presents two simulation models: a PV system model using the single-diode four-parameter model based on data sheet values and a Vanadium...
This paper presents a PV panel simulation model using the single-diode four-parameter model based on data sheet values. The model was implemented first in MATLAB/Simulink, and the results have been compared with the data sheet values and characteristics of the PV panels in standard test conditions. Moreover to point out the strong dependency on ambient conditions and its influence on array operation...
The paper presents some considerations regarding the problematic of asynchronous generator's (AG) excitation. There are presented some theoretical considerations regarding the efficiency of the capacitive excited asynchronous generator compounding regarding the load voltage variation compensation. There is presented the determination of the compounding condenser's capacity by using the graph-analytical...
The increasing amount of DER components into distribution networks involves the development of accurate simulation models that take into account an increasing number of factors that influence the output power from the DG systems. This paper presents two simulation models: a PV panel model using the single-diode four-parameter model based on data sheet values and a VRB system model based on the efficiency...
The paper presents a study for determination the optimal control law for a small horizontal axis windgenerator. Experimentally, using a mixed physical-analog laboratory model, were determined the state variables, corresponding to different wind speed values, for the optimum regimes of the wind turbine, based on the turbine theoretical estimated mathematical model. From a large multitude of possible...
The paper presents a study for implementing a brake sequence for a small wind generator for regimes that exceeds the rated values. Considering data from a real wind generator, two scenarios are presented: first, during a strong wind gust both the electrical and the mechanical brakes are coupled and, for the second case, a fault in the permanent magnet synchronous generator (PMSG) is caused. This study...
The paper proposes an innovative single-phase synchronous generator - a particular case of new generators' stator windings configurations. Electric structures of these configurations are considered, in the case of constant or variable speed squirrel cage and permanent magnet rotor of the three phase machines with single-phase output. The paper is focused on the study of the two stator windings permanent...
The paper presents a control strategy for a wind energy conversion system (WECS) for an optimal extraction of power from the wind. The topology of the system consists of a permanent magnet synchronous generator (PMSG), a diode bridge rectifier, a hybrid dc-dc converter which lowers the dc voltage, a supercapacitor and an inverter. However, the grid side inverter is not subject to this paper research...
The Diesel engine — synchronous generator system (DE-SG) is widely used in applications where the power distribution grid is absent. This system can ensure, in certain constructive and control (regulation) conditions, the electric energy at nominal values (U = 400 V, f = 50 Hz). This paper shows that is necessary for the SG to have the excitation in direct current, and so, to control the excitation...
The paper proposes a new, high gain, power conversion system and an innovative speed-control strategy dedicated to optimize the efficiency and the delivered electric energy of small horizontal axis wind generators with non-regulated blades, in the frame of an European Economic Area (EEA) project, in partnership with “Politehnica” University from Timisoara.
The paper aims to demonstrate that an wind system (wind turbine — WT + synchronous generator-SG), (WT + SG) cannot actually work at its maximum power points because of the rapid variation of the wind speed value and of the increased value of the inertia moments. The considered system (WT+SG) was mathematically modelled based upon the mathematical models of WT and SG, and the analysis focuses its bearing...
This paper refers, mainly, to the problem of the current harmonics of PM synchronous generator, due to the electric conversion system rectifier, interfacing the generator and the grid, present in the structure of the variable speed windgenerators. The problem was experimentally studied on “Politehnica” University from Timisoara (UPT) laboratory test rig, based on the PM synchronous generator — “ac...
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