Hydraulic Transmission Systems in Wind Energy Generation

Hydraulic transmission systems represent an innovative alternative to traditional mechanical gearboxes in wind turbines, using fluid power to convey torque from the rotor to the generator. By incorporating pumps, motors and accumulators, these systems enable continuously variable speed control, an essential feature for maximising energy capture across fluctuating wind conditions. Closed‐loop hydrostatic circuits permit precise regulation of fluid flow and pressure, smoothing power output and reducing mechanical stress on drivetrain components. The integration of hydraulic accumulators provides short‐term energy storage, buffering the intermittency of wind and improving grid compliance by delivering constant frequency electrical power. Such configurations offer high power density, modularity and reduced maintenance requirements, making them particularly attractive for offshore and community‐scale applications. Recent advances in control strategies, including model‐free adaptive techniques and intelligent optimisation algorithms, have enhanced the dynamic response and efficiency of hydraulic drivetrains. As wind turbines increase in size and capacity, hydraulic transmission systems are emerging as a versatile solution for improving reliability, lowering life‐cycle costs and supporting the global transition to renewable energy.

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Hydraulic Transmission Systems in Wind Energy Generation publication trend

The graph below shows the total number of articles in hydraulic transmission systems in wind energy generation across all publications each year (not limited to Nature Index journals).

Technical terms

Hydrostatic transmission: A fluid‐power drivetrain in which pressurised fluid is used to transmit torque between pump and motor, offering continuously variable speed control.

Variable‐displacement pump: A hydraulic pump whose output flow is adjusted by altering the swash plate angle, enabling regulation of torque and speed.

Hydraulic accumulator: A device that stores energy in the form of pressurised fluid, employing a gas‐charged chamber or spring to buffer fluctuations in flow and pressure.

Maximum power point tracking (MPPT): A control technique that continuously adjusts operating parameters to extract the highest possible power from a wind turbine under variable wind conditions.

Tip‐speed ratio (TSR): The ratio of the linear speed of the blade tip to the wind speed, a key parameter for optimising aerodynamic efficiency.

References

1. Improving Renewable Energy Recovery Efficiency in Variable Pressure Source Systems Through BP Neural Network Optimization. International Journal of Energy Research (2024).
2. Experimental Validation of a Hydrostatic Transmission for Community Wind Turbines. Energies (2022).
3. Adaptive fuzzy Proportion Integration Differentiation control in hydraulic offshore wind turbine for optimal power extraction based on the estimated wind speed. Energy Science & Engineering (2020).