Variable-Pitch Power Regulation of Tethered-Wing Systems Based on Robust Gain-Scheduling H-infinity Control

TL;DR

This paper presents a robust gain-scheduling H-infinity control strategy for variable-pitch tethered-wing systems, enhancing power regulation and load mitigation by adapting to wind conditions using LPV models.

Contribution

It introduces a novel LPV-based H-infinity control approach for tethered-wing systems, improving robustness and dynamic load management during varying wind speeds.

Findings

Controllers effectively maximize energy capture in low wind speeds.

The scheme reduces mechanical loads during high wind speeds.

Simulations show improved power regulation and load mitigation.

Abstract

In this paper, we deal with the power regulation of tethered-wing systems and demonstrate advantages of variable-pitch control in mitigating the dynamic mechanical loads and power fluctuations. The proposed scheme is based on a strategy that maximizes the energy capture during low-speed wind and prevents overloads during the high-speed wind. To realize this strategy, we use a tether reeling-speed controller to track the optimal generator speed during low-speed wind and a MIMO speed-force controller for power limitation during high-speed wind. The controllers are synthesized using H-infinity method and are based on a linear parameter varying (LPV) system that expresses the flexible dynamics of system as a function of the tether's length and force. Using this method, the controllers are made robust with respect to dynamic and parametric uncertainties and the wing's pitch angle activity is minimized during high-speed wind. We carry out extensive simulations to demonstrate the controllers' performance. These include the implementation of the scheme in a detailed 3-dimensional tethered-wing system simulator with a realistic turbulent wind field.