Power generation control of a hydrostatic wind turbine implemented by model‐free adaptive control scheme

Abstract

The hydrostatic wind turbine (HWT) is a type of wind turbine that uses hydrostatic transmission (HST) drivetrain to replace the traditional gearbox drivetrain. Without the fragile and expensive gearbox and power converters, HWT can potentially reduce the maintenance costs owing to the gearbox and power converter failures in wind power system, especially in offshore cases. We design an MFAC torque controller to regulate the pump torque of the HWT and compared with an scriptH∞ torque controller. Then we design an MFAC pitch controller to stabilise the rotor speed of HWT and compared with a gain‐scheduling proportional‐integral (PI) controller and a gain‐scheduling PI controller with antiwindup (PIAW). The results indicate that MFAC torque controller provides more effective tracking performance than the scriptH∞ controller and that MFAC pitch controller shows better rotor speed stabilisation performance in comparison with the gain‐scheduling PI controller and PIAW.

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

“…g f g 0 e mp md 1 ta (26) Because the relative order of the HESS (motor operating conditions) is 1 < 2, the design state feedback control is more complicated at this time, and it is difficult to implement in engineering practice.…”

“…Current research on HWTs pays considerable attention to improve the power capture performances and electrical grid connection by applying advanced control strategies 25–27 . Some research are relevant to active power smoothing control by HWT.…”

“…Current research on HWTs pays considerable attention to improve the power capture performances and electrical grid connection by applying advanced control strategies. [25][26][27] Some research are relevant to active power smoothing control by HWT. The 60 L hydraulic accumulator was added to a 50 kW HWT, and a control strategy proposed for the energy storage system to realize the power smooth control.…”

A novel collaborative control algorithm for maximum power point tracking of wind energy hydraulic conversion system

“…In addition, the existence of power converters decouples the generator from the grid, which impedes the direct inertia response to the grid, leading to reduced system stability and reliability 9 . Hydrostatic wind turbine (HWT) has the potential to address the above problems 10 . The power captured by the rotor can be transferred to the generator flexibly, which is installed either in the rotor nacelle, or on the ground that is benefit for operation and maintenance 11–13 .…”

Data‐driven modeling for fatigue loads of large‐scale wind turbines under active power regulation

“…The difference consisting in geographical location makes the wind conditions faced by wind turbines (WTs) in mountainous terrain noticeably different, leading to large deviations in the available wind power and fatigue distribution among the WTs 3 . Meanwhile, the wind farms are required to provide active power for the grid, and several control strategies of power dispatch ( e.g ., proportional distribution 4 and proportional–integral 5 ) are easy to be implemented. However, these strategies mainly focus on power reference tracking without considering fatigue loads of the WTs, which may significantly shorten the fatigue life of the WTs with richer wind in mountainous wind farms.…”