An Approach in Torque Control of Hydraulic Wind Turbine Powertrains

Akbari, Rasoul; Izadian, Afshin; Weissbach, Robert

doi:10.1109/ecce.2019.8913148

Cited by 8 publications

(9 citation statements)

References 13 publications

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“…In the case of having a variable-displacement, the pump speed is controlled through the pump displacement to obtain the maximum power coefficient (C max ) for different wind speeds. The optimum pump displacement is obtained as follows 23 :…”

Section: Optimal Pump Displacement Controlmentioning

confidence: 99%

“…The power flowing through the RSC can be controlled independently of the wind speed and turbine's angular velocity by controlling the generator speed. 23 Consequently, the GSC can be eliminated, and only the RSC can supply the rotor terminals in conjunction with storage, as shown in Figure 1. In this configuration, the RSC can control the generator's speed independently to attenuate output power fluctuations.…”

Section: The New Configurationmentioning

confidence: 99%

“…• Compared to our previous works, [23][24][25] a HESS consists of a battery, supercapacitor, and flywheel integrated into a split-shaft WECS. The proposed HESS configuration uses RSC and DFIG to control the HESS power allocation without additional dedicated hardware.…”

Section: Introductionmentioning

confidence: 98%

“…Utilizing a hydraulic transmission system (HTS) as a split-shaft in wind energy conversion systems (WECS) can provide these decouples. 23,24 Furthermore, Utilizing a doubly-fed induction generator (DFIG) alongside the HTS can reduce the system components and sizes. 25 This configuration can be employed to integrate a HESS without additional supporting hardware.…”

Section: Introductionmentioning

confidence: 99%

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Hybrid energy storage characterization for power profile enhancement in split‐shaft wind energy conversion systems

Akbari

Izadian

2022

Intl J of Energy Research

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Summary This paper characterizes an integrated hybrid energy storage unit required to support the new generator excitation system developed for doubly‐fed induction generators in the split‐shaft wind energy conversion units. The goal is to improve the power quality while significantly reducing the generator excitation power rating and component counts. The rotor excitation circuit is modified to directly include the storage to its DC link. The output power fluctuation can be attenuated solely by utilizing the rotor‐side converter making it self‐sufficient from the grid connection. The storage characteristics are identified based on several system design parameters, including the system inertia, inverter capacity, and energy storage capacity. The obtained power generation characteristics suggest an energy storage mix of fast‐acting types with a high energy capacity and moderate acting time. A feedback controller is designed to maintain the charge in the storage within the required limits. Adaptive model‐predictive control is also developed to reduce power generation fluctuations. The proposed system is investigated and simulated in MATLAB Simulink at different wind speeds to validate the results and demonstrate the system's dynamic performance. It is demonstrated that the system's inertia is critical to damping the high‐frequency oscillations of the wind power fluctuations. It is also shown that the bandwidth of the control system is determined by the system inertia and the size of the storage and inverter power rating.

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Section: Optimal Pump Displacement Controlmentioning

confidence: 99%

Section: The New Configurationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Hybrid energy storage characterization for power profile enhancement in split‐shaft wind energy conversion systems

Akbari

Izadian

2022

Intl J of Energy Research

Self Cite

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“…However, the MPPT control smoothness needed to be further improved. The frequency control and the MPPT control rely on the mechanical torque adjustment on the hydraulic motor that was coupled with the generator in [16]. A MPPT control strategy based on the tip speed ratio (TSR) was adopted for the 600 kW hydraulic energy storage wind turbine, and the maximum power tracking performance was simulated and analyzed by subjecting to turbulent speed condition in [17].…”

Section: Introductionmentioning

confidence: 99%

Application of the Feedback Linearization in Maximum Power Point Tracking Control for Hydraulic Wind Turbine

Gao

et al. 2020

Energies

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Taking the hydraulic wind turbine as the research object, the method is studied to improve the utilization ratio of wind energy for hydraulic wind turbine, when the wind speed is lower than the rated wind speed. The hydraulic fixed displacement pump speed and generating power can be used as control output to realize the maximum power point tracking control. The characteristics of the maximum power point tracking control are analyzed for hydraulic wind turbine, and the hydraulic output power is taken as control output based on the comprehensive performance requirements. Because the hydraulic wind turbine is a strong multiplication nonlinear system, the system is globally linearized based the feedback linearization method, and the maximum power point tracking control law is obtained. The simulation and experiment results show that the system has good dynamic performance with the proposed control law. The control provides theoretical guidance for optimal power tracking control law application for hydraulic wind turbine.

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Research on a power smoothing control strategy for energy storage hydraulic wind turbines

Gao

Zhang

et al. 2022

Energy Science & Engineering

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To solve the problem of large output power fluctuations in wind turbines and improve grid adaptability, a hydraulic energy storage system is introduced in traditional hydraulic wind turbines. Based on the working principle of energy storage hydraulic wind turbines, an energy storage hydraulic wind turbine state space model is established, and the feedback linearization method is introduced to solve the multiplication nonlinear problem in the modeling process. The output power is taken as the control output, and the torque compensation controller is established with the feedback linearization method. The displacement of the variable displacement pump motor is controlled to realize hydraulic energy storage system energy charging and discharging, and the wind turbine output power smoothing control is realized with the fluctuating wind speed. The power smoothing control strategy is verified with the 24 kW energy storage hydraulic wind turbines semi-physical simulation experimental platform. The proposed control strategy lays the groundwork for the wide application of the energy storage hydraulic wind turbines.

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An Approach in Torque Control of Hydraulic Wind Turbine Powertrains

Cited by 8 publications

References 13 publications

Hybrid energy storage characterization for power profile enhancement in split‐shaft wind energy conversion systems

Hybrid energy storage characterization for power profile enhancement in split‐shaft wind energy conversion systems

Application of the Feedback Linearization in Maximum Power Point Tracking Control for Hydraulic Wind Turbine

Research on a power smoothing control strategy for energy storage hydraulic wind turbines

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