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This work presents a robust control approach for Maximum Power Point Tracking (MPPT) of a standalone solar Photo Voltaic (PV) system, in order to boost its efficiency. For testing the algorithm, it was considered an 80W stand-alone solar PV cell. In order to improve the efficiency of the charge controller, the proposed control strategy follows the maximum power point output.
The paper presents some issues on testing the generators, integrated in wind turbine systems. Generators are subject to perturbations transmitted from the source to the source and to perturbations determined by the variable speed of the turbines' blades. The paper reviews the standards concerning tests in wind systems and depicts some specific tests, using a programmable source and specific standard...
The analysis of the electrical machines operation, usually appeals to monitoring and diagnosis techniques, the operation faults involving electrical, mechanical and aerodynamical parameters modification. The mechanical faults are due mainly to the unbalance of the rotating parts of the electrical machines and their analysis can be carried out using the vibration amplitude versus time and/or the vibration...
This paper deals with DC - AC static converter systems, of very high voltages and currents, used for electricity power transmission. It has been analyzed three types of converters: with forced commutation, with commutation from load and the solution proposed by the authors. There are shown the advantages in hybrid switching converters, which in essence connect, constructive and as principle of operation,...
The paper presents the design, FEM and experimental analysis of a Permanent magnet electrodynamic vibrator used in a Vibration Test System. This kind of Vibration Test System is to be used for electronic equipment vibration testing. A first prototype of a Permanent magnet electrodynamic vibrator has been designed and manufactured. After experimental testing it has been found that magnetic flux density...
The paper deals with the general problem of EMI filters used for harmonic perturbations generated by the PWM converters. In particular - are presented the design aspects and experimental results for EMI filter connected between the active filter and the low voltage network. For a typical solution of three phase EMI filter, a FEM modeling of magnetic circuit is performed. For the designed filter, the...
It is well known, actual trend in power electronics about exchange power thyristors with devices more flexible from point of view of commutation and possibility of command (IGBT, MOS transistors, GTO). There are applications, for example, DC high voltage electrical energy transmission, where because of high power switched, power thyristors remain an efficient solution. In this paper, is presented...
The issue of non-conventional energy sources now is correlated with energy efficiency and clean energy. An application researched by the authors is vibration stress relieving, which consist in vibration of stress reliving piece with electromagnetic or electro-dynamic vibrator to determine frequencies of resonance. Technology is energy efficient and involves a single-phase inverter with variable frequencies,...
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