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Interest in using magnet-less switched reluctance generators for wind turbines applications continues to gain popularity. Mainly due to unstable price of the magnet raw material that is one of the main challenges for engineers to forecast the final cost of the wind turbine. This paper presents design of a direct drive switched reluctance generator (DDSRG) for wind turbine applications using Finite-Element...
Information of rotor position and speed plays an crucial role in variable-speed wind energy conversion systems. Traditional sensors based position detection methods not only increase hardware complexity and system cost, but also face severe challenges on reliability caused by the disturbances from the varying weather and harsh operating conditions in wind energy generation sites. Thus, with the aim...
The rotational speed of a wind turbine is very low compared to that of classical generators, a speed multiplier is then necessary. To eliminate this last, research was directed towards the design of new structures of generators called direct drive (without a speed multiplier). The synchronous and especially asynchronous machines still dominate the market of the wind applications. However, the Switched...
The Switched Reluctance Generator (SRG) is a simple and robust machine, which has found application over a wide power and speed ranges in different shapes and geometries. This paper analyzes and compares two different field-assisted switched reluctance generators for wind turbine applications. The proposed novel generators consist of two magnetically independent stator and rotor sets (layers), where...
This paper presents new sensorless rotor position detection in a two phase Switched Reluctance Generators (SRG) by applying the DSP technique. This Method, it's possible to assess the placement of rotor of switched reluctance motors senselessly with amplitude modulation by field assisted in static position and in Motion. The proposed method is based on the dependency of the phase current slope that...
Since the application of power electronic devices became dominant in wind turbine systems, shaft voltage turned into a drawback of the AC generators as well as the AC motors in the modern AC drive applications. This voltage is a resultant phenomena of interaction between PWM strategies of power electronics converters and AC generator structure. Common mode voltage generated by PWM inverters and the...
Individual pitch control (IPC) for wind turbine load reduction in Region 3 operation is improved when wake interaction is considered. The Larsen wake model is applied for composing the rotor wind profile for downstream turbines under wake interaction. The wind profile of the turbine wake was generated by modifying the NREL's TurbSim codes. The state-space models of wind turbine were obtained via linearization...
This paper presents the design process of transverse flux switched reluctance generator (TFSRG) for low speed application with reduced total weight and volume. The characteristics such as generating power of TFSRG are compared with radial flux switched reluctance generator (RFSRG) through the design result and 3D finite element method (FEM). As a result, TFSRG can reduce the weight and volume as 16%...
This paper presents a novel sensorless control system of switched reluctance generator (SRG) in order to reduce cost, simplify system structure and increase reliability. Considering nonlinear characteristics of SRG and robustness of sliding mode observer (SMO), sensorless control method of SRG based on SMO is proposed and analyzed. For wind energy conversion system (WECS), a voltage-source PWM inverter...
This paper implements of a three phase grid synchronization for doubly-fed induction generators (DFIG) in wind generation system. A stator flux oriented vector is used to control the variable speed DFIG for the utility grid synchronization, active power and reactive power. Before synchronization, the stator voltage is adjusted equal to the amplitude of the grid voltage by controlling the d-axis rotor...
This paper presents a maximum power point tracking (MPPT) method which is applied on a wind turbine with permanent magnet synchronous generator (PMSG). A three-phase switched mode rectifier (SMR) is connected with the three phase output of the PMSG. The SMR employs a modulation strategy which is based on the space vector modulation (SVM) technique. Thus, the three phase input voltage is divided in...
This paper presents several shaft voltage reduction techniques for doubly-fed induction generators in wind turbine applications. These techniques includes: pulse width modulated voltage without zero vectors, multi-level inverters with proper PWM strategy, better generator design to minimize effective capacitive couplings in shaft voltage, active common-mode filter, reducing DC-link voltage and increasing...
Conceptually, a micro-grids can operate in parallel with the main grid system to support the grid voltage or as an isolated system to support customers isolated from the grid. In islanding operations, the micro-grid can continue to supply power to the customers thereby increasing the reliability of the power system. In a micro-grid with a significant percentage of wind power, a reactive power source...
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