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This paper presents the experimental testing of a control strategy for the parallel operation of two micro hydro power plants (MHPPs) on an islanded micro-grid (MG). The two MHPPs are equipped with constant-speed turbines that drive induction generators (IG). The proposed control system is a combination between a voltage source inverter (VSI) and a dump load (DL). The VSI operates at constant frequency,...
The paper intends to re-design a permanent magnets synchronous generator (PMSG) having low efficiency, in order to bring it in the range of actual generators. The starting point was a real machine which was transformed from induction machine into permanent magnets machine for series production. It had low efficiency and low power factor. By following the operational aspects of the machine and the...
This paper presents a control strategy that aims to improve the parallel operation of two micro hydro power plants (MHPPs) on an islanded micro-grid (MG). The two MHPPs are equipped with fix-speed turbines that drive induction generators (IG). The proposed control system is a combination between active elements — a voltage source inverter (VSI) with a dump load (DL) on its DC side — and passive ones...
This paper presents a voltage-independent control method for an active load (AL), which is designed for integration in microgrids with the main purpose of frequency control. Ideally, the AL should behave like a controllable linear current sink whose active power is independent of the input voltage. The proposed AL approaches the aforementioned conditions by combining a robust hardware structure with...
This paper presents a control strategy that aims to improve the parallel operation of two micro hydro power plants (MHPP) on an islanded micro-grid (MG). The two MHPP are equipped with a synchronous (SG) and an induction generator (IG). The proposed control systems ensures voltage and frequency regulation. The voltage is kept constant by the SG voltage controller, while the frequency by the use of...
For Romania, a New Member State of European Union, it is imperative to develop a mechanism to lead the country toward a knowledge based economy. The use of IT tools by Romanian companies, and especially SMEs - the most important category as percentage in GDP contribution, number and employment - is an important starting point for decision makers in this direction. In this paper, we present the results...
The Romaniapsila integration in the European Union was perceived by Romanian entrepreneurs as an opportunity and threat, at once. This paper presents the result of a complex research involving more than 1000 SMEs from all over the country, relevant for the Romaniapsila economic structure, designed to offer answers to decision makers from SMEs field about the actual benefits of integration process.
Decisions, and especially the strategic decisions, represent the main "products" of managerial process, representing the main responsibility of managers. The present model represents our view of decisional process designed to be a tool for managers in strategic decision making process. Developed at an enterprise level, the model takes into account the major factors that affect a strategy's...
Romania, a New Member state of European Union, has undertaken a complex process to adapt to new conditions and requirements of European market, especially the growing competition of foreign products and services once the commercial barriers had fallen. Romanian SMEs are the one of the most affected area. In order to create a general perspective on small and medium enterprises in Romania, apprehension...
Given to the fact that organizationspsila functionality and efficiency are strictly dependent on their capacity to anticipate and set up future plans, highlighting planning/ foresight activities developed within small and medium enterprises in our country has an essential significance in creating a general image. Research results reveal that annual plans and policies are issued in 45.24% of the total...
SMEs represent the backbone of most economies. Romanian economy is no exception. Their status represents a signal for the political decision-makers of the actual situation of the economy, because a powerful SMEs sector means a healthy economy. This paper presents the main economic results for SMEs in Romania, considering SMEspsila performances in 2007 compared to 2006. The research has been conducted...
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