Abstract
This paper addresses the control of a Tubular Linear Switched Reluctance Generator (TLSRG) with application in a point absorber device. A maximum power point tracking (MPPT) strategy is proposed to maximize the power extraction from ocean waves. The generator is characterized by average maximum force of 120 kN and a maximum velocity of 1.3 m/s. The proposed MPPT is achieved by changing the generator damping load according to the excitation force induced by a regular wave. A hysteresis controller is applied to regulate the phase current intensity which allows the control of the linear force provided by the generator. The conversion system direct current (DC) bus voltage is adjusted by an isolated DC/DC converter with a proportional integral controller to define the appropriate duty-cycle.
Highlights
The point absorber devices with direct drive extraction mechanism are the more efficient systems for ocean wave energy conversion at low velocity oscillations [1]
With the absence of permanent magnets in its configuration, the switched reluctance machine is a strong alternative as linear generator for direct conversion devices
The Tubular Linear Switched Reluctance Generator (TLSRG) has been designed with the capability to provide a mean damping force of, approximately, 120 kN, which is the maximum value expected for the ocean wave excitation force
Summary
The point absorber devices with direct drive extraction mechanism are the more efficient systems for ocean wave energy conversion at low velocity oscillations [1]. The complex-conjugate control and passive loading are the continuous control techniques with more acceptance for point absorber devices [11] The former seeks a resonant motion of the floating body by changing respective amplitude and phase while the latter only modifies the amplitude by adjusting the converter dynamic resistance to improve the power absorption from the incoming waves. In [20], a novel robust model predictive control is presented for application in heaving wave energy converters to maximize the power conversion output while accounting with the device motion constraints In the latter approach, the PTO force is parameterized using orthogonal polynomials in order to reduce the computational complexity verified in standard model predictive control techniques. The complexity of controller is heavily reduced which makes it easier to implement
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