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System Analysis for Hydrostatic Transmission for Wave Energy Applications - Simulation and Validation
Dominic Dießel, RWTH Aachen University, Institute for Fluid Power Drives and Controls (IFAS), Germany
Wave Energy Converters (WEC) are used to transform energy stored in ocean waves
into electrical energy. One type of WECs consists of buoyant bodies. To extract energy
from their motion, hydraulic cylinders can be used to generate hydraulic power. For
conversion into electric power various systems have been analysed in literature.
However, the focus was put on efficiency and rigorous analyses of the system
behaviour are still missing. In this paper an exemplary system consisting of two
hydraulic cylinders, switchable check valves, accumulators and three motor-generator
sets is analysed with help of simulation and measurement. This exemplary system is
called WavePOD and was installed at the Institute for Fluid Power Drives and Controls
(IFAS) of RWTH Aachen University together with Aquamarine Power and Bosch
Rexroth for testing. In this paper the data collected during various test phases is used
for system analysis and for validating the simulation. The simulation model is
presented. The systems response to various switching operations is investigated.
Comparing the simulation with measurements validates the system`s dynamic model.