Dynamic Performance Simulation of Hydraulic Transmission for Low Speed Vertical Axis Marine Current Turbine Using MATLAB Simulink

Abstract

For Malaysia, ocean energy can be the best resource of green marine renewable energy. This is for the reason, the generation of the electricity by burning of fossil fuels produces undesired greenhouse gases and moreover the reserves of fossil fuels are being depleted and there is no accurate way to determine how much still remains. Turbines using hydraulic drive are being used for generating electricity by some manufacturers in the wind industry as an alternative to gearbox drive-trains because of reliability issues. Likewise, in the marine renewable sector, hydraulic-drive is an attractive option in terms of improved system efficiency, reliability and robustness. This paper presents a time domain simulation of hydraulic transmissions for Low Speed Vertical Axis Marine Current Turbines (VACT) using MATLAB Simulink software. These turbines are applied to harness marine current energy because of their relative simplicity and represent a promising technology to exploit low speed currents due to their small plants with reduced installation and maintenance costs.

ADV Preview Based Nonlinear Predictive Control for Maximizing Power Generation of a Tidal Turbine With Hydrostatic Transmission

“…In contrast to the existing HTTs [8]~ [10], the displacements of the hydraulic pump and motor can both be regulated simultaneously and continuously in the proposed HTT. By regulating the hydraulic pump displacement in time and using the high pressure accumulator as energy buffer, the HTT can well accommodate bidirectional tidal flows and considerable short-term tidal speed variations or turbulences.…”

“…In addition, the whole dynamics model of the HTT was not detailed. In [10], a time domain simulation of a low speed vertical axis HTT was presented by using MATLAB/Simulink. The simulation is useful, but the detailed dynamics modelling and control were not presented.…”

“…(a) A horizontal axis HTT is proposed, designed, modelled and finally validated to enhance the tidal turbine performance. In contract to the existing HTTs [8]- [10], the displacements of the hydraulic pump and motor can both be regulated simultaneously and continuously in the proposed HTT, which allows variable speed control of the tidal turbine rotor while maintaining constant generator rotation speed. Unlike the above-mentioned works on HTT modelling, the detailed dynamics model of the HTT is investigated and presented.…”

“…By equaling the flowrates pm QQ  in (8) and (10) and neglecting the pipeline pressure drop, the generator speed is…”