Modelling and Performance Analysis of Grid Connected PMSG Based Tidal Generation System

Abstract

Globally, most national grid relies on fossil fuel with consequent economic burdens, environmental pollution and global warming. Hence, Tidal energy possesses the capacity to mitigate the emission of carbon dioxide because it is clean, abundant, less expensive and predictable. However, the power output from Tidal energy generation system (TEGS) fluctuates due to changes in tidal flow whereby causing power instability. This work is geared at fundamentally model, simulate and control TEGS since it encounters problems such as harmonics, frequency fluctuations and voltage sags. These problems are resolved using a nonlinear controller coupled with a high-speed simulation of circuit-oriented electrical and digital electronic systems. The generator power output is optimised by utilising various control methods as proposed to control the voltage and frequency which is a Voltage Oriented Control technique that relies on high level performance 𝑑𝑞‐coordinate controllers. The system simulation is implemented in the MATLAB/Simulink environment. The current controller and DC‐link voltage controller are designed using Internal Model Control method. The simulation results show the system performance in response to the load and dc‐bus voltage step changes while directly running a Simulink model as a controller. The performance and validity of the preferable control method is verified by the simulation results and corresponds to available literature. The simulated results show that the controller can stabilise the constant dc-link voltage under dynamic and steady-state performance of the system.