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A new converter topology for a permanent magnet synchronous generator based variable speed wind turbine is presented in this paper. Main focus is on a combined topology of a controlled rectifier and a brand new step-up isolated DC/DC converter. This topology (controlled rectifier coupled with a quasi-Z-source based galvanically isolated step-up DC/DC converter) is essential to generate a regulated...
This paper presents a unified control method for the combined permanent magnet generator (PMG) and three-phase boost rectifier that can be used in autonomous power systems such as more-electric aircraft requiring high power density. With the unified control, the paper shows the system can function well without additional boost inductors. The design procedure for the control is presented, including...
This paper deals with an adaptive control method to be used in the dc-link voltage controller of diesel-electric power supply units being arranged with both permanent magnet generator and three-phase boost-rectifier. The proposed control method is based on a suitable manipulation of the overall system transfer function to achieve an adaptive “closed form” expression for the parameters of the dc-link...
The paper studies the performance of variable speed wind turbine (VSWT) configuration with non-inverting buck-boost converter. The wind turbine systems consist of permanent magnet synchronous generator (PMSG) connected to diode rectifier, DC chopper and load. New control strategy, based on the maximum power point tracking (MPPT) and limited power point tracking (LPPT) algorithms is used to improve...
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...
Microturbine generator system is one of the most promising distributed generation systems because it is small, efficient and mobile. When it is running, the high-frequency alternating current of permanent magnet synchronous generator generating must be rectified and inverted into 50Hz AC to meet the user requirements. Normally, the diode rectifier is used. When we need to regulate voltage, the DC/DC...
The main advantages of the high speed machine are small size and high power density. However, the high speed machine suffers from higher loss density and cooling difficulty due to small cooling area, especially the high frequency harmonic currents produced by the power conversion system increase the loss and temperature of high speed machine. The output high frequency AC power of the high speed PM...
This paper presents a control strategy for a rectifier with variable speed direct driven permanent magnet synchronous generator. In order to achieve maximum power point tracking (MPPT) for wind power generation systems, the rotating speed of wind turbines should be adjusted in the real time according to wind speeds. The fuzzy logic controller is used to track generator speed with varying wind speed...
Literature reports several future portable and distributed power supplies in the watt to kilowatt range based on rotating machinery equipped with a variable-speed permanent-magnet generator. In order to generate a constant dc voltage, an ultra-compact, highly efficient, low power rectifier is required. In this paper, different topologies are compared concerning losses, volume and control complexity...
Constant speed of mobile electrical power sources (EGS) will be soon replaced by optimally controlled variable speed, driving robust permanent magnet generator equipped with power electronics frequency and voltage control. The paper gives short revue of some problems in research and development of optimally variable speed of EGS. The results of modeling and experimental verification EGS with multilevel...
The paper presents a novel AC and DC stabilization scheme system for a Wave Energy Converter (WEC) using Permanent Magnet Linear Generator PMLG connected to a six pulse diode rectifier. The proposed dynamic controller of the WEC-Battery renewable energy system is based on Particle Swarm Optimization(PSO) technique. The optimization search algorithm is implemented to control a novel low cost dynamic...
This paper proposes the use of a three-phase high frequency semi-controlled rectifier operating in the discontinuous conduction mode, feasible for small wind energy conversion systems based on permanent magnet generator. The main advantages of the topology are: simple gate drive circuits, since all active switches of the rectifier are connected to a common point; robustness, as short circuit through...
In this paper, a novel rectifier with boost capability is presented. Through control the phase delay angle, the rectifier switches the operating mode from parallel to serial of two sets of power supplies, which is simplified from PMSG. Compared to other topology used in PMSG based variable speed system, the proposed rectifier features low cost, simple control and reliable structure. The topology can...
This paper proposes a control strategy for variable speed wind energy conversion system (WECS), incorporating maximum power point tracking (MPPT) algorithm, using direct driven permanent magnet synchronous generator (PMSG). The generator is operated in the speed control mode below the base speed by controlling the terminal voltage using three phase front-end active-rectifier feeding power to the DC...
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...
In this paper, the design and performance analysis of a robust and inexpensive permanent magnet-assisted synchronous reluctance generator (PMa-SynRG) with its corresponding control topology is studied. More specifically, the topology based on vector control for the maximum output power of generator is investigated. The torque of PMa-SynRG is controlled by a combustion engine speed and the maximum...
A novel control strategy for the operation of a permanent magnet synchronous generator (PMSG) based stand alone variable speed wind turbine is presented in this paper. The direct drive PMSG is connected to the load through a switch mode rectifier and a vector controlled pulse width modulated (PWM) IGBT-inverter. The generator side switch mode rectifier is controlled to achieve maximum power from the...
Electrical conversion system for permanent magnet wind generators is challenging due to the large rating of power electronics devices needed and the associated costs. Additionally, due to the large inductance present in the generator (synchronous reactance), voltage drops results with resistive load and the generator output power is limited. A solution utilizing an active series compensation device...
The free piston energy converter (FPEC) is a new type of power unit for hybrid electric vehicle. In a FPEC, an internal combustion engine driven permanent magnet linear generator (PMLG) may be utilized to produce electrical energy. A three-phase active rectifier topology together with its controller is presented for controlling the generator output. The PMLG loaded with an active rectifier is modeled...
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