Modeling and control of a hybrid wind-tidal turbine with hydraulic accumulator

Fan, Yajun; Mu, Anle; Ma, Tao

doi:10.1016/j.energy.2016.06.072

Cited by 35 publications

(13 citation statements)

References 25 publications

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“…Fan et al investigated the modeling and control of a hybrid wind turbine equipped with a hydraulic accumulator. Their results showed that the accumulator could suppress the power fluctuation caused by disturbances in the wind and tidal velocity . When a wind generator equipped with hydraulic energy storage (WG‐HES) uses a synchronous generator, the generator is driven by a variable motor because it adopts the hydraulic system with a “fixed displacement pump‐variable displacement motor”, and uses an accumulator.…”

Section: Introductionmentioning

confidence: 99%

“…Their results showed that the accumulator could suppress the power fluctuation caused by disturbances in the wind and tidal velocity. 23 When a wind generator equipped with hydraulic energy storage (WG-HES) uses a synchronous generator, the generator is driven by a variable motor because it adopts the hydraulic system with a "fixed displacement pump-variable displacement motor", and uses an accumulator. Therefore, the variable motor speed must be controlled to remain constant so that the synchronous generator frequency is constant.…”

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confidence: 99%

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Combined constant speed control method for a wind generator equipped with hydraulic energy storage

et al. 2019

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A wind generator equipped with hydraulic energy storage (WG-HES) uses hydraulic transmission systems instead of gearbox transmissions, thus eliminating high-power converters and reducing the tower-top cabin weight. When there is no wind or the wind speed is extremely low, the pressured oil released by accumulators is used to drive a motor to operate at a constant speed, thereby generating constant-frequency power. However, few studies have examined the constant speed control characteristics for generating electricity using only an accumulator group. In this study, a combined constant speed (CCS) proportional-integral-derivative (PID) control method based on "variable displacement and throttling" is proposed, which includes two closed loops and one regulating loop. First, a simulation model of the CCS PID control method for a variable motor was established in the Simcenter Amesim program. The influence of different PID parameters on the anti-interference ability of the constant speed control of the motor was analyzed under a given load step. Then, we obtained the range of control parameter values and a set of optimal values. Second, the effectiveness of the CCS control method and the accuracy of the simulation results were verified on a 600-kW WG-HES system prototype. The results verified that the CCS control method has good anti-interference ability and can meet the requirements of constant speed control for a variable motor under the best PID parameters. These results can provide a basis for developing control strategies for WG-HESs when there is no wind or at low wind speeds. KEYWORDS accumulator-controlled hydraulic motor, anti-interference, combined constant speed control, hydraulic energy storage | INTRODUCTIONRenewable energy is becoming increasingly prominent owing to the rising insufficiency of fossil fuels to meet the demands of the growing global population. 1-5 Solangi et al. revealed that wind energy is the most feasible renewable energy resource for electricity generation, 6 and the proportion of wind energy in the energy market is increasing continuously. 7 Significant advances in wind turbine manufacturing have enabled lowering the production costs of devices for harvesting wind energy, and the application range of wind power generation equipment has broadened. 8,9 Conventional wind turbines use gears and gearboxes to transfer energy. However, such systems have a high risk of failure and heavy cabins, both of which result in high maintenance costs. 1,10,11 Therefore, direct-drive wind turbines were developed, but these systems require a large-

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Combined constant speed control method for a wind generator equipped with hydraulic energy storage

et al. 2019

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“…presented [111] a novel hybrid wind-tidal architecture, where a hydraulic accumulator is used as a storage and balance system, placed between both hydraulic pumps and the electrical generator. Hydraulic pumps transform the output turbine mechanical energy into hydraulic energy.…”

Section: Energy Management System and Control Studiesmentioning

confidence: 99%

“…Different solutions have been investigated to limit these fluctuations. Among them, tidal energy attracted attention, concerning tidal generator control [105][106][107]109,111,112] and the possibility to use it as a flywheel storage system [106,112]. Another point of interest observed in academic research is the transient state system stability, not only for resource fluctuations but also for load change [101,102,104,107].…”

Section: Energy Management System and Control Studiesmentioning

confidence: 99%

Electrical Power Supply of Remote Maritime Areas: A Review of Hybrid Systems Based on Marine Renewable Energies

et al. 2018

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Abstract:Ocean energy holds out great potential for supplying remote maritime areas with their energy requirements, where the grid size is often small and unconnected to a continental grid. Thanks to their high maturity and competitive price, solar and wind energies are currently the most used to provide electrical energy. However, their intermittency and variability limit the power supply reliability. To solve this drawback, storage systems and Diesel generators are often used. Otherwise, among all marine renewable energies, tidal and wave energies are reaching an interesting technical level of maturity. The better predictability of these sources makes them more reliable than other alternatives. Thus, combining different renewable energy sources would reduce the intermittency and variability of the total production and so diminish the storage and genset requirements. To foster marine energy integration and new multisource system development, an up-to-date review of projects already carried out in this field is proposed. This article first presents the main characteristics of the different sources which can provide electrical energy in remote maritime areas: solar, wind, tidal, and wave energies. Then, a review of multi-source systems based on marine energies is presented, concerning not only industrial projects but also concepts and research work. Finally, the main advantages and limits are discussed.

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“…Schulte et al [11] presented a fault-tolerant control scheme based on sliding mode and tested for hydrostatic wind power systems. Similar with wind energy, tidal current energy can also be harvested with hydrostatic transmission by replacing wind turbines with current turbines [12,13].…”

Section: Introductionmentioning

confidence: 99%

Research on an Integrated Hydrostatic-Driven Electric Generator with Controllable Load for Renewable Energy Applications

Wang

2017

Energies

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Abstract:A hydrostatic transmission is a promising technology in renewable energy harvesting, such as wind energy and wave energy, where the hydrostatic-driven electric generator is a key energy conversion component. By using analytical and experimental methods, this paper investigates the performance of a novel hydrostatic-driven electric generator which integrates the functions of an axial piston hydrostatic motor and a permanent magnet electric generator together. The experimental platform consists of a prototype, an adjustable hydrostatic power source, a controllable electrical load, and various sensors. Energy conversions between hydrostatic and electrical forms are evaluated under different operating velocities and control signals. Power loss distributions are presented by combining measured data and analytical calculation. Thermal experiments are implemented under both of natural and oil-forced cooling conditions and it is found that the temperature rise is much lower when the machine is cooled by hydraulic oil. The experiments validate the energy conversion efficiency, steady controllability, and cooling capability of the integrated hydrostatic-driven electric generator. The results can provide references for further efficiency optimization, dynamic control, as well as practical application.

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Modeling and control of a hybrid wind-tidal turbine with hydraulic accumulator

Cited by 35 publications

References 25 publications

Combined constant speed control method for a wind generator equipped with hydraulic energy storage

Combined constant speed control method for a wind generator equipped with hydraulic energy storage

Electrical Power Supply of Remote Maritime Areas: A Review of Hybrid Systems Based on Marine Renewable Energies

Research on an Integrated Hydrostatic-Driven Electric Generator with Controllable Load for Renewable Energy Applications

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