Predictive Power Control of Grid and Rotor Side converters in Doubly Fed Induction Generators Based Wind Turbine

Boulahia, Abdelmalek; Mehdi, Adel; Benalla, H.

doi:10.11591/ijece.v3i3.3474

Cited by 14 publications

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“…However, these frequency control strategies have been developed for a power system with almost complete reliance on conventional energy sources, and the penetration of RES may require the participation of these new units in the control tasks [3]. Wind turbines, particularly those of variable-speed with doubly-fed induction (DFIG), constitute one of the most used RES around the world [9] [10]. Hence, several studies have been proposed about control strategies for the active inclusion of DFIG WT in Load Frequency Control loops, and complete reviews can be found in references [7] [11] [12].…”

Section: Introductionmentioning

confidence: 99%

PI and LQR controllers for Frequency Regulation including Wind Generation

Álvarez¹,

Patiño²,

Espinosa³

2018

IJECE

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<pre>The increasing use of renewable technologies such as wind turbines in power systems may require the contribution of these new sources into grid ancillary services, such as Load Frequency Control. Hence, this work dealt with the performance comparison of two traditional control structures, PI and LQR, for secondary regulation of Load Frequency Control with the participation of variable-speed wind turbines. For this purpose, the doubly-fed induction generator wind turbine was modeled with additional control loops for emulation of the inertial response of conventional machines for frequency regulation tasks. Performance of proposed strategies was verified through simulation in a benchmark adapted from the WSCC 3 machines 9-bus test system. Results showed overall superior performance for LQR controller, although requiring more strenuous control effort from conventional units than PI control.</pre>

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Section: Introductionmentioning

confidence: 99%

PI and LQR controllers for Frequency Regulation including Wind Generation

Álvarez¹,

Patiño²,

Espinosa³

2018

IJECE

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“…The WECS based DFIGs control comprises both the rotor side converter (RSC) combines the technique of MPPT and grid side converter (GSC) controllers so that the RSC controls stator active and reactive powers and the GSC regulates dc-link voltage as well as generates an independent reactive power that is injected into the grid [7], [8], for RSC traditionally the vector control (VC) based on a stator flux orientation [7], [9] using proportional-integral (PI) controllers [10], However, it has some disadvantages, such as its dependence on the machine parameters variation, that its performance largely depends on the tuning of the PI parameters, must be optimally tuned to ensure the system stability within the whole operating range and attain sufficient dynamic response during the transient conditions [7]. In order to overcome the aforementioned problems, different nonlinear control methods such as direct torque control/direct power control (DTC/DPC) have been proposed of DFIG based wind turbine systems has proposed recently [11], [12].…”

Section: Introductionmentioning

confidence: 99%

A Complete Modeling and Control for Wind Turbine Based of a Doubly Fed Induction Generator using Direct Power Control

Senani¹,

Rahab²,

Benalla³

2017

IJPEDS

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The paper presents the complete modeling and control strategy of variable speed wind turbine system (WTS) driven doubly fed induction generators (DFIG). A back-to-back converter is employed for the power conversion exchanged between DFIG and grid. The wind turbine is operated at the maximum power point tracking (MPPT) mode its maximum efficiency. Direct power control (DPC) based on selecting of the appropriate rotor voltage vectors and the errors of the active and reactive power, the control strategy of rotor side converter combines the technique of MPPT and direct power control. In the control system of the grid side converter the direct power control has been used to maintain a constant DC-Link voltage, and the reactive power is set to 0. Simulations results using MATLAB/SIMULINK are presented and discussed on a 1.5MW DFIG wind generation system demonstrate the effectiveness of the proposed control. Keyword:Back-to-back converter DFIG DPC MPPT WTS Copyright © 2017 Institute of Advanced Engineering and Science.All rights reserved. Corresponding Author:Senani Fawzi, Laboratoire de l'Electrotechnique de Constantine (LEC), Faculté des Sciences de la Technologie, Université des frères Mentouri de Constantine 1, Ain el-bey 25000 Constantine, Algerie. Email: senani.fouzi@gmail.com INTRODUCTIONActually, there are several sources of renewable energy, wind energy, hydropower, geothermal energy, biomass, biofuel and solar energy [1]. Wind and solar electric power generation systems are popular renewable energy resources [2]. The wind energy conversion system (WECS) has been considered to be one of the main energy resources are growing rapidly among the other renewable generation power technologies due to its freely available, clean and renewable character [3][4][5]. Wind energy conversion systems are basically divided into two fixed and variable speed.Variable speed WECS have been many advantages: operation at maximized power capture over a wide range of wind speeds, reduced mechanical stresses imposed on the turbine, and improved power quality compared with fixed speed WECS[5], [6]. The variable speed WECS using the DFIGs are suitable and promising for application in wind energy. The DFIG is particularly employed for high-power applications, due to the lower converters cost and lower power losses [7].The WECS based DFIGs control comprises both the rotor side converter (RSC) combines the technique of MPPT and grid side converter (GSC) controllers so that the RSC controls stator active and reactive powers and the GSC regulates dc-link voltage as well as generates an independent reactive power that is injected into the grid [7], [8], for RSC traditionally the vector control (VC) based on a stator flux orientation [7], [9] using proportional-integral (PI) controllers [10], However, it has some disadvantages, such as its dependence on the machine parameters variation, that its performance largely depends on the tuning of the PI parameters, must be optimally tuned to ensure the system stability within the whole operating range

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“…In [8], the variations in active and reactive power abd DC bus voltage is addressed and both the GSC and RSC are dynamically controlled by active and reactive power of DFIG. The objective of maintaining DC link voltage at constant level is achieved in [9] for variable speed performance but it is not dealt with the unbalanced voltage case. The DC bus voltage and electromagnetic torque oscillations due to fault in [10] is not addressed properly.…”

Section: Introductionmentioning

confidence: 99%

A Control Strategy for DFIM to Minimize DC Bus Voltage Fluctuations and Torque Oscillations

Madhav

Obulesu

2017

IJEECS

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The Keywords: doubly fed induction generator, direct power control, rotor connected converter, grid connected converter, torque oscillations cancellationCopyright © 2017 Institute of Advanced Engineering and Science. All rights reserved. IntroductionIn the recent past and also presently the wind energy generation has developed rapidly both in terms of onshore and offshore wind farms. In variable speed wind energy conversion systems, the Doubly Fed Induction Generator (DFIG) is considered to be common solution [1]. The commonly used control technique for these variable speed wind turbines is the Field Oriented Control (FOC) technique [2] but has drawbacks like nature of linearity and lack of robustness when it is subjected to variations in operational conditions. The nonlinear control techniques like Direct Torque Control (DTC) or Direct Power Control (DPC) [3][4][5] have gained importance in the recent past. These techniques are used because of the nature of nonlinearity of the inverter with finite possible states and due to the linear time-varying nature of the DFIG model. The basic principle of these techniques is to control instantaneously the torque or active power and the magnitude of flux or reactive power in one sample time by selecting voltage space vector and an average control signal. In DPC technique, the Rotor Side Converter (RSC) instantaneous switching states are determined based on the active and reactive power measurements made in the stator circuit, which is quite different from the DTC technique i.e., the measurements are taken at one terminal of the DFIG and the switching states are carried at another terminal. There is no necessity of PWM voltages integration in DPC strategy unlike DTC strategy, which leads to stable operation even when rotor frequency is set to zero. The DPC strategy is independent of stator or rotor resistance as it is inherently a position sensor less method.As the DFIG is directly connected to grid, therefore it is more succumbed to faults which generally cause non-sinusoidal output currents, electromagnetic torque (T em ) or power oscillations which leads to more mechanical stress in the wind turbine and ripples in the DClink voltage, unequal heating and power loss. Various methods were proposed to focus on the solution to control DFIG when there is a network unbalance. In [6], a modified Direct Torque Control technique is applied to rotor side frequency converter and the transient behavior of

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Predictive Power Control of Grid and Rotor Side converters in Doubly Fed Induction Generators Based Wind Turbine

Cited by 14 publications

References 0 publications

PI and LQR controllers for Frequency Regulation including Wind Generation

PI and LQR controllers for Frequency Regulation including Wind Generation

A Complete Modeling and Control for Wind Turbine Based of a Doubly Fed Induction Generator using Direct Power Control

A Control Strategy for DFIM to Minimize DC Bus Voltage Fluctuations and Torque Oscillations

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