scholarly journals Damping of Torsional Vibrations in a Type-IV Wind Turbine Interfaced to a Grid-Forming Converter

2021 ◽  
Author(s):  
Artur AVAZOV ◽  
Frédéric Colas ◽  
Jef Beerten ◽  
Xavier Guillaud
Keyword(s):  
Wind Turbine ◽  
Negative Impact ◽  
Stable Operation ◽  
Torsional Vibrations ◽  
Type Iv ◽  
Power Oscillations ◽  
Inertial Response ◽  
Transient Events ◽  
Grid Side ◽  
Classical Control

This paper introduces a Type-IV wind turbine interfaced to a grid-forming converter. In order to retain the stable operation of a wind turbine in the presence of a grid-forming control, the classical control of a back-to-back converter has to be modified. The modification of this control creates a strong link between a wind turbine and grid dynamics. From the grid side perspective, this link allows provision of the inertial response from a wind turbine during transient events. On the wind turbine side, this coupling causes the appearance of the torsional vibrations within the drivetrain structure. These vibrations are then propagated to the grid as power oscillations. As a result, there is a negative impact on the mechanical components of a wind turbine as well as on the power system operation. In this work, a solution is introduced in order to suppress the undesired vibrations by applying a damping technique to the control of a back-to-back converter combined with a grid-forming control. Based on the conducted analysis, the addition of a damping filter results in the mitigation of torsional vibrations.

scholarly journals Damping of Torsional Vibrations in a Type-IV Wind Turbine Interfaced to a Grid-Forming Converter

2021 ◽  
Author(s):  
Artur AVAZOV ◽  
Frédéric Colas ◽  
Jef Beerten ◽  
Xavier Guillaud
Keyword(s):  
Wind Turbine ◽  
Negative Impact ◽  
Stable Operation ◽  
Torsional Vibrations ◽  
Type Iv ◽  
Power Oscillations ◽  
Inertial Response ◽  
Transient Events ◽  
Grid Side ◽  
Classical Control

This paper introduces a Type-IV wind turbine interfaced to a grid-forming converter. In order to retain the stable operation of a wind turbine in the presence of a grid-forming control, the classical control of a back-to-back converter has to be modified. The modification of this control creates a strong link between a wind turbine and grid dynamics. From the grid side perspective, this link allows provision of the inertial response from a wind turbine during transient events. On the wind turbine side, this coupling causes the appearance of the torsional vibrations within the drivetrain structure. These vibrations are then propagated to the grid as power oscillations. As a result, there is a negative impact on the mechanical components of a wind turbine as well as on the power system operation. In this work, a solution is introduced in order to suppress the undesired vibrations by applying a damping technique to the control of a back-to-back converter combined with a grid-forming control. Based on the conducted analysis, the addition of a damping filter results in the mitigation of torsional vibrations.

scholarly journals Control of a Type-IV Wind Turbine With the Capability of Robust Grid-Synchronization and Inertial Response for Weak Grid Stable Operation

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 58553-58569 ◽  
Author(s):  
Shun Sang ◽  
Chen Zhang ◽  
Xu Cai ◽  
Marta Molinas ◽  
Jianwen Zhang ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Stable Operation ◽  
Weak Grid ◽  
Grid Synchronization ◽  
Type Iv ◽  
Inertial Response

Torsional Vibrations in the Drivetrain of DFIG- and PMG-Based Wind Turbines: Comparison and Mitigation

2015 ◽  
Author(s):  
Fariba Fateh ◽  
Warren N. White ◽  
Don Gruenbacher
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Sliding Mode ◽  
Torsional Vibrations ◽  
Doubly Fed Induction Generator ◽  
Voltage Dip ◽  
Power Oscillations ◽  
Control Scheme ◽  
Doubly Fed ◽  
Mechanical Disturbances

In this paper, torsional vibrations in a five-mass drivetrain of a doubly fed induction generator (DFIG)-based and a permanent magnet generator (PMG)-based wind turbine are investigated through simulations. The simulated model includes aerodynamics of a 750kW wind turbine, as well as the dynamics of the generator, gearbox, and back-to-back power converters. In this study, the effectiveness of a sliding mode based control scheme to damp the drivetrain torsional vibrations for the events of a voltage dip occurring on the power grid and a wind speed variation is presented. The simulation results demonstrate mechanical disturbances have similar impacts on the drivetrain of DFIG-based and PMG-based wind turbines. However, the back-to-back converters in a PMG-based wind turbine effectively isolate the effects of power oscillations on the drivetrain.

scholarly journals Application of Input Shaping Method to Vibrations Damping in a Type-IV Wind Turbine Interfaced with a Grid-Forming Converter

2021 ◽  
Author(s):  
Artur AVAZOV
Keyword(s):  
Wind Turbine ◽  
Electrical Power ◽  
Voltage Source ◽  
Additional Stress ◽  
Voltage Source Converter ◽  
Input Shaping ◽  
Torsional Vibrations ◽  
Electromagnetic Torque ◽  
Direct Drive ◽  
Type Iv

Type-IV wind turbines can experience torsional vibrations in the drivetrain structure. This can lead to additional stress on turbine components and a quality reduction of the power delivered to the grid. The vibrations are mostly induced by fast variations of the electromagnetic torque, which depends on the control of a back-to-back converter. A number of studies have already presented methods to mitigate the drivetrain vibrations. However, the research was dedicated to cases when the converter, interfacing a wind turbine to the grid, operates based on a grid-following control. A wind turbine can be also interfaced to a grid-forming converter. In this case, a back-to-back converter control creates a strong link between the electromagnetic torque and grid dynamics, so the abovementioned problem remains relevant. Therefore, this paper presents a solution to damp torsional vibrations in the direct drive of a Type-IV wind turbine, interfaced to the electrical power grid with a voltage source converter based on a grid-forming control. The damping of the drivetrain vibrations relies on the input shaping method implemented using a zero-vibration filter. Simulation results prove the effectiveness of the method to damp drivetrain vibrations during grid frequency variations. In addition to that, damping impact on system behavior with respect to other parameters is analyzed and its mitigation is discussed.

scholarly journals Application of Input Shaping Method to Vibrations Damping in a Type-IV Wind Turbine Interfaced with a Grid-Forming Converter

2021 ◽  
Author(s):  
Artur AVAZOV
Keyword(s):  
Wind Turbine ◽  
Electrical Power ◽  
Voltage Source ◽  
Additional Stress ◽  
Voltage Source Converter ◽  
Input Shaping ◽  
Torsional Vibrations ◽  
Electromagnetic Torque ◽  
Direct Drive ◽  
Type Iv

Type-IV wind turbines can experience torsional vibrations in the drivetrain structure. This can lead to additional stress on turbine components and a quality reduction of the power delivered to the grid. The vibrations are mostly induced by fast variations of the electromagnetic torque, which depends on the control of a back-to-back converter. A number of studies have already presented methods to mitigate the drivetrain vibrations. However, the research was dedicated to cases when the converter, interfacing a wind turbine to the grid, operates based on a grid-following control. A wind turbine can be also interfaced to a grid-forming converter. In this case, a back-to-back converter control creates a strong link between the electromagnetic torque and grid dynamics, so the abovementioned problem remains relevant. Therefore, this paper presents a solution to damp torsional vibrations in the direct drive of a Type-IV wind turbine, interfaced to the electrical power grid with a voltage source converter based on a grid-forming control. The damping of the drivetrain vibrations relies on the input shaping method implemented using a zero-vibration filter. Simulation results prove the effectiveness of the method to damp drivetrain vibrations during grid frequency variations. In addition to that, damping impact on system behavior with respect to other parameters is analyzed and its mitigation is discussed.

Overview of Subsynchronous Oscillation in Grid-connected Wind Farm

2020 ◽  
Vol 13 (7) ◽  
pp. 969-979
Author(s):  
Xu Pei-Zhen ◽  
Lu Yong-Geng ◽  
Cao Xi-Min
Keyword(s):  
Power Systems ◽  
Wind Turbine ◽  
Large Scale ◽  
Wind Farm ◽  
Wind Farms ◽  
Induction Generator ◽  
Future Research ◽  
Stable Operation ◽  
Subsynchronous Oscillation ◽  
Different Types

Background: Over the past few years, the subsynchronous oscillation (SSO) caused by the grid-connected wind farm had a bad influence on the stable operation of the system and has now become a bottleneck factor restricting the efficient utilization of wind power. How to mitigate and suppress the phenomenon of SSO of wind farms has become the focus of power system research. Methods: This paper first analyzes the SSO of different types of wind turbines, including squirrelcage induction generator based wind turbine (SCIG-WT), permanent magnet synchronous generator- based wind turbine (PMSG-WT), and doubly-fed induction generator based wind turbine (DFIG-WT). Then, the mechanisms of different types of SSO are proposed with the aim to better understand SSO in large-scale wind integrated power systems, and the main analytical methods suitable for studying the SSO of wind farms are summarized. Results: On the basis of results, using additional damping control suppression methods to solve SSO caused by the flexible power transmission devices and the wind turbine converter is recommended. Conclusion: The current development direction of the SSO of large-scale wind farm grid-connected systems is summarized and the current challenges and recommendations for future research and development are discussed.

scholarly journals Research on Zero-Voltage Ride Through Control Strategy of Doubly Fed Wind Turbine

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2287
Author(s):  
Kaina Qin ◽  
Shanshan Wang ◽  
Zhongjian Kang
Keyword(s):  
Wind Turbine ◽  
Wind Power ◽  
Control Strategy ◽  
Large Scale ◽  
Sliding Mode ◽  
Stable Operation ◽  
Wide Range ◽  
Dc Bus ◽  
Doubly Fed ◽  
Zero Voltage

With the rapid increase in the proportion of the installed wind power capacity in the total grid capacity, the state has put forward higher and higher requirements for wind power integration into the grid, among which the most difficult requirement is the zero-voltage ride through (ZVRT) capability of the wind turbine. When the voltage drops deeply, a series of transient processes, such as serious overvoltage, overcurrent, or speed rise, will occur in the motor, which will seriously endanger the safe operation of the wind turbine itself and its control system, and cause large-scale off-grid accident of wind generator. Therefore, it is of great significance to improve the uninterrupted operation ability of the wind turbine. Doubly fed induction generator (DFIG) can achieve the best wind energy tracking control in a wide range of wind speed and has the advantage of flexible power regulation. It is widely used at present, but it is sensitive to the grid voltage. In the current study, the DFIG is taken as the research object. The transient process of the DFIG during a fault is analyzed in detail. The mechanism of the rotor overcurrent and DC bus overvoltage of the DFIG during fault is studied. Additionally, the simulation model is built in DIgSILENT. The active crowbar hardware protection circuit is put into the rotor side of the wind turbine, and the extended state observer and terminal sliding mode control are added to the grid side converter control. Through the cooperative control technology, the rotor overcurrent and DC bus overvoltage can be suppressed to realize the zero-voltage ride-through of the doubly fed wind turbine, and ensure the safe and stable operation of the wind farm. Finally, the simulation results are presented to verify the theoretical analysis and the proposed control strategy.

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