Abstract
In this work, a new control methodology is proposed for Type -IV wind energy conversion system (WECS) using a self-recurrent wavelet neural network (SRWNN) control with a Vienna rectifier as the machine side converter (MSC). A SRWNN combines excellent dynamic properties of recurrent neural networks and the fast convergence speed of wavelet neural network. Hidden neurons of SRWNN contains local self-feedback loops, which provide the memory feature and the necessary information of past values of the signals, allowing it to track maximum power from WECS under varying wind speeds. The Vienna rectifier allows unity power factor operation to increase electrical efficiency. Frame angle-controlled wavelet modulation is proposed for the grid side converter (GSC). Wavelet modulated inverter produces output voltage fundamental components with higher magnitudes than those obtained from the pulse width modulated inverters. The non-linear load compensation and power quality enhancement are achieved by executing frame angle control for WM inverter. The overall system is modeled, and performance is verified in MATLAB Simulink. The hardware prototype is developed, and the switching pulses for the rectifier and inverter are generated using dSPACE1104 controller. The results prove that the system provides low harmonic content and high magnitude of the fundamental current component at the machine and grid sides and ensures maximum power operation at various wind speeds.
Highlights
As the wind power generation has been increasing day by day,it is essential to design and select a proper generator and converters for wind energy conversion system (WECS)
Various power converter topologies have been proposed in the literature for the variable-speed permanent magnet synchronous generator based WECS
This paper proposes sef-recurrent wavelet neural network (SRWNN) maximum power point tracking (MPPT) control at machine side converter (MSC) and frame angle control with wavelet modulation at grid side converter (GSC) for a PMSG driven WECS
Summary
As the wind power generation has been increasing day by day,it is essential to design and select a proper generator and converters for wind energy conversion system (WECS). Power converters are the backbone of WECS for interfacing with the grid to provide greater flexibility in their operation and control, both during steady-state and transient. Various power converter topologies have been proposed in the literature for the variable-speed permanent magnet synchronous generator based WECS. With the advantages of low cost, high reliability, and simple control algorithms, a simple configuration integrating a diode rectifier, a DC chopper, and a voltage source inverter (VSI) is widely adopted [2]. With the increasing power level of the WECS, the power switch device of a DC chopper in the topology must endure high instantaneous voltage and current stress [3].
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