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The objective of the proposed scheme is to extract the maximum power at different wind turbine speed. In order to achieve this, MPPT controller is implemented on the rectifier side for the extraction of maximum power. On the inverter side normal closed loop PWM control is carried out. MPPT controller is implemented using fuzzy logic control technique. The fuzzy controller's role here is to track the...
This paper deals with the modeling and control of a Wind Energy Conversion System (WECS) based on a Permanent Magnet Synchronous Generator (PMSG). The WECS operate at variable speed and the control algorithm is based on Direct Power Control (DPC) with an AC/DC conversion system with a PI controller for the DC bus output. The laboratory test system is developed with an emulator of a wind turbine and...
Conventional power management schemes for standalone wind systems typically use maximum power point tracking (MPPT) methods to extract maximum power from the wind even when the energy storage has reached its capacity. By doing so, the dummy load suffers from unnecessary stress when the load and energy storage element cannot absorb the excess power. This paper proposes an intelligent sensor-less fuzzy-logic...
Because of combustion of fossil fuels global warming caused by environmental problems, the raising prices of crude oils and natural gases. They promote continuous effort to improve energy system and its efficiency. There is a need to search for abundant and clean energy sources due to the depleted and increasing prices of oil. Wind energy acts as an alternative renewable energy source. Wind generators...
This paper proposes two effective maximum power point tracking (MPPT) algorithms for two different wind energy conversion systems connected to the grid using permanent magnet synchronous generator (PMSG). The wind turbine (WT) is connected to the grid via back-to-back PWM-VSC for the first scheme, whereas, the WT is connected to the grid via diode-bridge rectifier, boost converter and the grid side...
CSC topology with natural advantages in terms of simple structure, grid friendly waveforms, controllable power factor, and reliable grid short-circuit protection is considered to be a promising converter configuration for use in mediumvoltage (kV) high-power (MW) PMSG based wind energy systems. In view of this, three types of configurations for current source converter (CSC) based medium-voltage PMSG...
This paper proposes a control technique of water pumping system based on wind turbine generator in an isolated area. The turbine is used to drive the PMSG in order to feed an isolated load composed of a DC motor and a hydraulic centrifuge pump. The considered load receives the required active power from the DC generator. The models of the wind turbine, the PMSG Generator and the DC motor are developed...
Multilevel converters are widely recognized as a suitable solution for directly interfacing different types of power sources and energy storage systems to the medium voltage grids, due to their ability in high-voltage and high-power applications. The DC-voltage regulation of a five-level neutral-point clamped (NPC) in closed loop is presented. It consists to regulate the average value of the DC-voltage...
A novel control strategy for the operation of a permanent magnet synchronous generator (PMSG) based stand alone variable-speed wind energy system is presented in this paper. The direct drive PMSG is connected to the load through a unity power factor current-controlled rectifier, which offers features such as high power factor operation, voltage regulation ability, low switching voltage stress and...
This paper proposes a novel control technique to improve the power factor over a wide range of wind speed in a wind energy conversion system (WECS) based on a current source inverter (CSI) and an electrically excited synchronous generator (EESG). The system consists of diode rectifier on the generator-side while a pulse wave modulated (PWM) CSI is on the grid-side. In the proposed control scheme,...
In this study, power factor correction rectifier is proposed for wind turbines with three phase permanent magnet synchronous generators to provide maximum energy conversion efficiency. Reference values for the rectifier are controlled by a fuzzy logic based algorithm to track maximum power point of the wind turbine which varies with turbine characteristics, wind speed, temperature, etc. The proposed...
The current paper proposes an automated design approach for a previously developed passive converter circuits for wind turbine generators. This suggested approach allows to calculate the components for all passive converter circuits approved in European patent number PCT/EP2010/055637, where only minor changes in the source code of the mathematical and simulation software have to be made when different...
A novel control method for tip speed ratios of the series connected wind turbines in a wind farm by controlling the field currents of the wind generators is proposed. It is confirmed that good agreements between experimental and simulation results are obtained, showing the usefulness of the proposed method of the simulation model. Also, it is shown that reactive power of the wind generators of this...
This paper focuses on design and simulation of a novel small scale Wind Energy Conversion System (WECS) based on Permanent Magnet Generators (PMGs) and power electronic converters. Electric power is generated using a PMG whose output is having variable magnitude and variable frequency due to non-uniform wind velocity. In the proposed system output of PMG is converted to constant DC using a full bridge...
This paper deals with the design and conception of an embedded power source using supercapacitors (SCs) which are charged by means of solar panels and having a Unit Power Factor (UPF) electronic converter supplied by wind generator. These SCs ensure the power supply of an electrical network of 60 kW by using sliding mode principle control. The operating principle of this device and some experimental...
This paper deals with design and simulation of LLC resonant converter for renewable energy source. Here a stand-alone wind energy system is used. The LLC resonant inverter system and DC- to- DC converter system are simulated using MATLAB simulink power system blocks. This converter has advantages like reduced transformer size, reduced filter size and current source characteristics. The simulink circuit...
A conventional small-scale wind energy conversion system consists of a permanent magnet synchronous generator, a diode rectifier, a boost converter, and a grid-side inverter. Since the generator stator currents cannot be controlled independently using a diode rectifier, relatively large electromagnetic torque ripple results caused by the low frequency generator stator harmonic current. The torque...
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 outlines critical steps to be taken during design of a wind power generation and utility interfacing system. These steps include determining generator open circuit voltage, utility and DC bus voltages, determining topologies for rectifiers and inverters, examining power control strategies, sizing active and passive components in the entire system.
In the control of the wind generation, the maximal power point tracking (MPPT) control plays important role in the efficiency. This paper presents the simulation results of the MPPT control with RTDS-based PMSG model. At first, it analyzes the vector-control scheme for the MTTP, which results in independent control of active and reactive power of the generator. And then, it develops the MPPT controller...
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