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Nowadays there is an increasing use of power electronic converters on ships. With power electronic converters motors can be controlled very accurately saving a lot of energy. However, the use of converters can lead to problems with harmonic distortion on the AC bus if for the rectifiers Diode Front Ends (DFE's) are used. There will be no harmonic distortion when Active Front Ends (AFE's) are used...
A small scale wind energy conversion system has tremendous diversity of use and operating conditions, and consequently is evolving rapidly along with the large scale wind energy conversion system for generation of electricity in either stand-alone or grid connected applications. In recent years, the grid connected small wind turbine industry is primarily dominated by the Permanent Magnet Generator...
A simple method involving only a quadratic equation has been developed for calculating the minimum and maximum values of excitation capacitance that will sustain self-excitation in an induction generator meant for isolated power supplies. This approach has also been further extended for the determination of maximum load of a given power factor that could be applied to the generator without losing...
This paper discusses the modeling of a direct-driven wind energy conversion system with a synchronous generator, a diode rectifier, a boost converter and the resistor and capacitor load. In the paper, a way to establish a real time model of the system is described, a real time model of the system is established, and the dynamic results are shown. The static simulation results and the dynamic simulation...
This paper has presented a modular converter for multi-coil direct-drive permanent magnet wind generator system. The converter modules are cascaded to achieve medium voltage output (6 kV~33 kV), thus eliminating the grid-side step-up transformer, which is desirable for both on-shore and offshore wind turbines. Each converter module is composed of a rectifier, dc-link and an inverter. The generator...
This paper describes an electrical system layout for a wave power plant connecting linear generators to the grid. The electrical power out from the wave energy converters must be converted before they can be connected to the grid. The conversion is carried out in marine substations that will be placed on the seabed. The paper presents experimental power data from a wave energy converter that has been...
This work introduces an innovative low cost topology for a wind conversion system with an efficient output power control in order to meet the battery charge requirements. The project is in accord with the specifications required at IFEC 2009 (the 2009 International Future Energy Challenge, sponsored by IEEE). The proposed topology is based on a high frequency discontinuous conduction mode three-phase...
This paper studies control system operation and control strategy of 3 KW wind power generation for 3G base station. The system merges into 3G base stations to save power in order to fully ensure that base stations can get supply power normally in any case. The outputs of the system consist of a non-controlled rectifier, a boost converter and a single-phase power supply inverter, which used as the...
Direct-drive wind power generator has been receiving increasing attention due to their inherent efficiency. By eliminating the need for a gearbox between the wind turbine and generator, these systems are less expensive and also require less maintenance. This paper outlined a procedure of adapting a small, standard, readily available PM synchronous machine for direct coupling to a small wind turbine...
This paper has presented a modular converter for multi-coil direct-drive permanent magnet wind generator system. The converter modules are connected in series to achieve medium voltage output, thus eliminating the grid-side step-up transformer. The generator coils with 90 degree phase shift are rectified through power factor correction (PFC) circuit and connected in parallel to get unit power factor...
This paper presents a novel control strategy for the operation of a direct drive permanent magnet synchronous generator (PMSG) based stand alone variable speed wind turbine. The control strategy for the generator side converter with maximum power extraction is discussed. The stand alone control is featured with output voltage and frequency controller capable of handling variable load. The potential...
Mini hydropower and wind power plants have a promising future in Poland. Variable speed cascaded induction generators could be an attractive alternative to conventional double output induction generators habitually applied in mini hydropower stations. Cascaded induction generators require lower maintenance due the absence of slip rings and brushes. Unidirectional power converters can be employed in...
Wind energy conversion systems have become a focal point in the research of renewable energy sources. Due to rapid advances in the size and power rating of wind generators as well as development of power electronics. These electrical utilities generate and provide energy in AC form. As the wind energy to electrical power conversion is rather expensive we concentrate on efficiency increase inside electrical...
A new circuit topology is introduced, to build up a power electronic rectifier for applications foreseeing electrical power generation from marine currents. The new power converter seems able to guarantee both DC-side voltages with very low ripple and sinusoidal generator currents. The proposed circuit topology is intended for applications in which, for each power generation unit, two turbines (and...
Permanent magnet based wind generators are one of the more promising technology. This paper presents a comparison of power converter topologies for permanent magnet small wind turbine systems to improve the power quality and to extract the maximum power from wind. Two detailed models are presented and explained: the first configuration is made by a diode-bridge rectifier, a boost converter and an...
In a current source converter (CSC) based wind energy system, the dc link current plays an important role in determining the system dynamic performance. This paper proposes two control strategies that can be used to improve the dynamic performance of the dc link current in a CSC wind energy system using permanent magnet synchronous machine (PMSM). State space equations and small-signal models of the...
This paper presented a system of Aircraft Power Distribution System (APDS). Large-signal models of synchronous generator, three phase boost converter and inverter was developed. A two-port network interconnection rule was chose as a special convention about voltage and current variable of component exchange, and a system level model of APDS was performed. The system model was designed to assessment...
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