Adaptive Takagi–Sugeno Fuzzy Model Predictive Control for Permanent Magnet Synchronous Generator-Based Hydrokinetic Turbine Systems

Yu-Chen Lin,Valentina Emilia Balas,Ji-Fan Yang,Yu-Heng Chang

doi:10.3390/en13205296

Abstract

This paper presents a sensorless model predictive torque control strategy based on an adaptive Takagi–Sugeno (T–S) fuzzy model for the design of a six–phase permanent magnet synchronous generator (PMSG)–based hydrokinetic turbine systems (PMSG-HTs), which not only provides clean electric energy and stable energy-conversion efficiency, but also improves the reliability and robustness of the electricity supply. An adaptive T–S fuzzy model is first formed to characterize the nonlinear system of the PMSG before a model predictive torque controller based on the T–S fuzzy model for the PMSG system is employed to indirectly control the stator current and the stator flux magnitude, which improves the performance in terms of anti–disturbance, and achieves maximum hydropower tracking. Finally, we consider two types of tidal current, namely the mixed semidiurnal tidal current and the northwest European shelf tidal current. The simulation results demonstrate that the proposed control strategy can significantly improve the voltage–support capacity, while ensuring the stable operation of the PMSG in hydrokinetic turbine systems, especially under uneven tidal current speed conditions.

Highlights

With the international oil crisis and the continuous deterioration of the global environment, many countries are stepping up their development of renewable energy sources, which include tidal, wind, solar, geothermal, and marine energy, as well as biomass, and biofuels
Discussion (PMSG-HTs), two real-world tidal current profile cases were considered in terms of the northwest European shelf [37] and the Pentland Firth [38]
An adaptive T–S fuzzy model predictive control (ATSFMPC) strategy has been proposed for a sensorless permanent magnet synchronous generator (PMSG)-based hydrokinetic turbine systems (PMSG-HTs) when there are random fluctuations due to the uncertainty of tidal current speed

Summary

Introduction

With the international oil crisis and the continuous deterioration of the global environment, many countries are stepping up their development of renewable energy sources, which include tidal, wind, solar, geothermal, and marine energy, as well as biomass, and biofuels. The exploitation of wind and marine energy has dramatically increased in recent years. The former has the disadvantages of the length of operating time and the dependence on the seasonal wind speed variations, while, given that the oceans contain rich tidal current energy and that the tidal current is highly predictable since the high– and low–tide cycles are well known, the latter can provide a stable output and sufficient power to the grid. Hydroelectric power is a reliable renewable energy source that contributes to the stability and stable electricity delivery by reason of its flexible generation potential. New technology has applied ocean power from ocean tides, waves, currents, salinity, and ocean temperature difference to increase

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Results

Conclusion