Abstract
Energy efficient generation from renewable energy sources is of major concern nowadays. A horizontal axis marine current turbine (HAMCT) of diameter 1.9 m is modelled using the blade element momentum (BEM) scheme and the turbine output parameters are given as an input to the electrical system for a tip speed ratio (TSR) of 5 and a power coefficient of 0.4. The design aspects of a buck-boost converter with proportional integral (PI) and sliding mode controller (SMC) is investigated for HAMCT system, with the highest power output of about 15.6 kW for a water velocity of 3 m/s. A comparison between PI controller and SMC are analyzed for the tidal turbine conversion system to obtain the desired output voltage with high efficiency is discussed here. The dynamic variation on load side to be controlled with dual loop controller to regulate the output voltage and to optimize the input current. In this paper performance and resemblance of control techniques which include sliding mode controller and PI controller are analysed with step and bode plot response. The system is designed for an output voltage range of 0.38 kV to 2.4 kV which is suitable for DC microgrids. The performance of HAMCT coupled with PMSG and the power converter with a controller is modelled and designed under MATLAB/SIMULINK environment.
Highlights
The renewable energy source includes sunlight, geothermal, wind, tides, water, biomass, etc. out of these, tides are predictable sources of energy and tidal turbines show a high potential[1]
The dynamic variations of load can be controlled by properly designing an appropriate both proportional integral (PI) and a sliding mode controller (SMC) for buck-boost DC-DC converter to ensure stability of the system under any operating condition, a schematic representation of the PI controller and SM controller for the buck-boost converter is shown in Fig. 6(a) and (b)
In the DC-DC converter, input and load variation adapt the normal functioning of the system which may harm the overall tidal turbine conversion systems (TTCS), control strategy are analysed under load variation by keeping input side consistent and with time and frequency response of the controller
Summary
The renewable energy source includes sunlight, geothermal, wind, tides, water, biomass, etc. out of these, tides are predictable sources of energy and tidal turbines show a high potential[1]. Out of these, tides are predictable sources of energy and tidal turbines show a high potential[1]. This paper uses the modelling and control of PMSG for tidal turbine applications. Output current of buck boost converter (A) dd and qq self-inductances (H) Extracted power from the flow (kW). VVpph−pph ρρ Output voltage of buck boost converter (V) Incoming velocity of the tidal current (m/s) and relative velocity (m/s) seen by segment of blade section Output voltage ripple considered to be 0.5% of output voltage (V) Phase to phase voltage for and Y transformer connections (V) Water density (kg/m3). KamblKi .OOmmkakarrete.atla./l.E/nEerngeyrgPyrPocroecdeiadi0a01(62001(280)1090)05–2060–0533 λλqqqq ,λλdddd Stator qq and dd-axis flux linkages (Wb-t) xx, xx2, xxee State variable for inductor current (iiLL), output capacitor voltage (VVCC), total tracking error αα, αα2 Control parameters termed as sliding co-efficient
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