SEA TITAN datasheet

Introduction

SEA TITAN project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No. 764014. The aim is making a step change in the wave energy sector by designing, building, testing and validating a crosscutting and innovative Direct Drive Power Take-Off (PTO) solution to be used with multiple types of wave energy converter. The developed Direct Drive Power Take-Off comprises a linear switched reluctance machine (LSRM) used for wave energy applications. The LSRM comprises two main parts: a static passive side and moving active part, formed by two active sides with different manufacturing process.

The results collected in this document describe the tests on the two Active Sides of the PTO developed in the SEA TITAN. These tests allow to characterise the electrical and magnetic parameters of the machine, especially the force and the magnetic flux. From these results and the design curves obtained by FEM software, a comparison and an adjustment of the mathematical model could be done, checking the design parameters defined during the design process. Moreover, the results are the input of the mathematical model which contains the losses of the system. This model is used to analyse the impact of the PTO in its integration with different Wave Energy Converters (WECs).

Those results collected in this repository are described in detailed in the deliverables D5.4 and D5.5 of the SEA TITAN project.

Description of the parameters used

The repository contains the following parameters:

Active Side identifier (“Active Side identifier”):

This parameter incorporates the identification number of the Active Side. The first active module is manufacturing a single-pancake coils and the second module hosts the welded plate coils.

Phase identifier (“Phase identifier”):

This parameter incorporates the identification number of the Phase in each Active Side. In this case, each module has 3 phases.

Position [mm] (“Position [mm]”):

This parameter describes the position of the active side respect to the passive side and is measured by a wire encoder (model Waycon SX135). It starts from the fully alignment position for a phase of one Active Side. This position is the point in which the force developed by the machine is zero since both poles, active and passive, are aligned. The array ends when the fully misalignment position is achieved. This position is the midpoint between two poles of the passive side.

Modified Position [mm] (“Modified Position [mm]”):

This parameter describes the position of the active side respect to the passive side. The array starts with the zero value which is the fully alignment position for the activated phase. This position is the point in which the force developed by the machine is zero since both poles, active and passive, are aligned. The array ends when the fully misalignment position is achieved. This position is the midpoint between two poles of the passive side.

Current Reference [A] (“Current Reference [A]”):

This parameter is the theoretical value defined in the control as input for the control. In the tests, the supply current follows a hysteresis band waveform, therefore the reference value and the mean value could some discrepancy.

Real current measured by the Yokogawa [A] (“Yokogawa current [A]”):

This parameter describes the RMS value of the current supplied by the power converter to the activated phase of the Active Side. This variable is measured by an advance oscilloscope (Yokogawa PX8000).

Real current measured by a Fluke clamp meter [A] (“Fluke current [A]”):

This parameter describes the mean value of the current supplied by the power converter to the activated phase of the Active Side. This variable is measured by a Fluke clamp meter (Fluke 365 clamp meter).

Current measured by the monitoring and control system implemented in Labview [A] (“Labview current [A]”):

This parameter describes the mean value of the current supplied by the power converter to the activated phase of the Active Side. In this case, the value is measured by a current sensor (LEM sensor) which record displays the value in the control system.

Voltage measured by the Yokogawa [V] (“Yokogawa voltage [V]”):

This parameter describes the mean value of the voltage supplied by the power converter to the activated phase of the Active Side. This variable is measured by a precision oscilloscope (Yokogawa PX8000).

Voltage measured by a Fluke multimeter [V] (“Fluke voltage [V]”):

This parameter describes the mean value of the voltage supplied by the power converter to the activated phase of the Active Side. This variable is measured by a multimeter (Fluke 175 multimeter).

Voltage measured by the load cell [V] (“load cell voltage [V]”):

This parameter describes the voltage measured by the load cell. This voltage represents an equivalent force developed by the machine. The cell is calibrated in the range (0-10V) and is installed in the Active Side. The load cell model is TCE 10t and an electronic equipment for amplifying the signal measured by the sensor (model AEP TA4).

Force calculated by the load cell [N] (“Force load cell [N]”):

This parameter is calculated from the voltage value measured by the load cell. Both parameters voltage and force has a direct relationship.