MRAS Observer for Sensorless Control of Standalone Doubly Fed Induction Generators

Cárdenas, Roberto; Peña, R.; Proboste, J.; Asher, G.M.; Clare, John

doi:10.1109/tec.2005.847965

Cited by 244 publications

(138 citation statements)

References 11 publications

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“…This feature makes DFIG a preferred choice in highpower grid-connected WECSs, due to the huge economic gains resulting from reduced sizes of power converters and filters [19]. Moreover, different control strategies, developed and investigated in [20]- [22], have demonstrated ease of control of DFIG in standalone wind energy applications, especially from the voltage regulation point of view. However, the rotor voltage and current need to be carefully controlled during the initial transients, as they can be too high to be handled by the reduced-size converters [23].…”

Section: Conventional and Potential Generator Types Used In Wecsmentioning

confidence: 99%

A small-scale standalone wind energy conversion system featuring SCIG, CSI and a novel storage integration scheme

Alnasir

Kazerani

2016

Renewable Energy

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Small-scale standalone wind turbines provide a very attractive renewable energy source for off-grid remote communities. Taking advantage of variable-speed turbine technology, which requires a partial-or full-scale power converter, and through integrating an energy storage system, smooth and fast power flow control, maximum power point tracking, and a highquality power is ensured.Due to high reliability and efficiency, permanent magnet synchronous generator seems to be the dominating generator type in gearless wind turbines, employed for off-grid applications.However, wind turbines using geared squirrel-cage induction generator (SCIG) are still widely accepted due to their robustness, simplicity, light weight and low cost. Permanent magnet induction generator, a relatively new induction-based machine, has recently been recognized in the wind energy market as an alternative for permanent magnet synchronous generator. A thorough comparative study, among these three generator types, is conducted in this research in order to enable selection of the most appropriate generator for off-grid wind energy conversion system (WECS), subject to a set of given conditions. The system based on geared SCIG has been shown to be the most appropriate scheme for a small-scale standalone WECS, supplying a remote area.Different topologies of power electronic converters, employed in WECSs, are overviewed.Among the converters considered, current source converter is identified to have a great potential for off-grid wind turbines.Three current-source inverter-based topologies, validated in the literature for on-grid WECS, are compared for off-grid WECS application. Feasibility study and performance evaluation are conducted through analysis and simulation. Among all, the topology composed of three-phase diode bridge rectifier, DC/DC buck converter, and pulse-width-modulated current-source inverter (PWM-CSI) is identified as a simple and low-cost configuration, offering satisfactory performance for a low-power off-grid WECS.A small-scale standalone wind energy conversion system featuring SCIG, CSI and a novel energy storage integration scheme is proposed and a systematic approach for the dc-link inductor design is presented. iv In developing the overall dynamic model of the proposed wind turbine system, detailed models of the system components are derived. A reduced-order generic load model, that is suitable for both balanced and unbalanced load conditions, is developed and combined with the system components in order to enable steady-state and transient simulations of the overall system. A linear small-signal model of the system is developed around three operating points to investigate stability, controllability, and observability of the system. The eigenvalue analysis of the small-signal model shows that the open-loop system is locally stable around operating points 1 and 3, but not 2. Gramian matrices of the linearized system show that the system is completely controllable at the three operating points and completely observable at...

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Section: Conventional and Potential Generator Types Used In Wecsmentioning

confidence: 99%

A small-scale standalone wind energy conversion system featuring SCIG, CSI and a novel storage integration scheme

Alnasir

Kazerani

2016

Renewable Energy

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“…The estimation of the air gap torque and rotational speed of the DFIG is carried out by means of using a so-called Model Reference Adaptive System (MRAS) [6].…”

Section: Estimation Of Torque and Rotational Speedmentioning

confidence: 99%

Sensorless control for active damping of torsional vibrations in wind turbine drivetrains with doubly-fed induction generator

Wenske¹,

Beckert²

2016

REPQJ

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Abstract.Until now, the most common drivetrain concept for multimegawatt wind turbines is still the classic design with multi-stage gearbox and fast running doubly-fed induction generator (DFIG). Some control strategies for damping of drivetrain torque oscillations already exist, but they based on mechanical sensors, e.g. speed and rotary encoders which can fail within the harsh environment of a wind turbine. To reach the highest possible system reliability it is obvious trying to minimize the number of installed sensors.This contribution shows an innovative sensorless control method with great performance for DFIG coupled to highly oscillatory mechanical drive systems, such as in wind turbine drivetrains. The aim of the approach is, to reduce wear and increase service life by means of active damping torsional vibrations in the mechanical drivetrain during normal operation using a high reliable sensorless control system for the converter-fed generator. The outstanding feature of the control method is, that it requires no sensors for rotational angle, speed or shaft torque and considers the inherent highly oscillatory characteristic of geared drivetrains mostly equipped with DFIG. Therefore measuring of electrical quantities, that is the stator phase voltages and currents and rotor phase currents of a DFIG is sufficient, when using a combination of different observer structures for the electrical and mechanical subsystem of the drivetrain. The outcome is a sensorless field oriented vector and a state controller for effective active damping. The presented algorithms are tested on a laboratory test rig, some of the results and measurements are presented here.

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“…In this paper an indirect stator-oriented vector control scheme is used to provide constant voltage and frequency for variations in both load and wind speed. Further studies on this topic when the DFIG is connected to an unbalanced load using sensorless control have been published by the same authors in [16], and more recently by other authors in [17]. A similar indirect control approach is proposed in [18], but using rotor flux control instead of rotor current.…”

Section: Introductionmentioning

confidence: 99%

Control of Variable Speed Wind Turbines with Doubly Fed Asynchronous Generators for Stand-Alone Applications

2017

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This paper addresses the design and implementation of a novel control of a variable speed wind turbine with doubly fed induction generator for stand-alone applications. In opposition to grid-tied applications, in stand-alone systems the voltage and frequency must be generated by the doubly fed induction generator. Therefore, a voltage and frequency controller is required for supplying the load at constant voltage and frequency. This controller is implemented by orientation of the generator stator flux vector along a synchronous reference axis. In this way, constant voltage and frequency is obtained and the generator will supply the active and reactive power demanded by the load, while the wind turbine will be responsible for achieving power balance in the system. Then, power control is assumed by the pitch actuator controlling the rotational speed of the wind turbine for power balancing. A load shedding mechanism is needed if the load power exceeds the maximum available wind power. Detailed simulation results are presented and discussed to demonstrate the capabilities and contributions of the proposed control scheme.

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MRAS Observer for Sensorless Control of Standalone Doubly Fed Induction Generators

Cited by 244 publications

References 11 publications

A small-scale standalone wind energy conversion system featuring SCIG, CSI and a novel storage integration scheme

A small-scale standalone wind energy conversion system featuring SCIG, CSI and a novel storage integration scheme

Sensorless control for active damping of torsional vibrations in wind turbine drivetrains with doubly-fed induction generator

Control of Variable Speed Wind Turbines with Doubly Fed Asynchronous Generators for Stand-Alone Applications

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