A simple maximum power point tracker for grid connected variable speed wind energy conversion system with reduced switch count power converters

Abstract

Abstract-In this paper, a simple control strategy for an optimal extraction of output power from grid connected variable speed wind energy conversion system(VSWECS) with reduced switch count power converters is presented. In order to improve the overall efficiency and to reduce the cost, B-4 PWM converters are used. The system consists of a variable speed wind turbine coupled to a permanent magnet synchronous generator(PMSG) through a gear box, two PWM B4-power converters. Output power from PMSG is first converted into dc and then it is fed to the grid. Both the power conversions are performed at unity power factor and the de link voltage is maintained constant. The (MPF'T) extracts optimum power from the wind turbine from cut-in to rated wind velocity by sensing only the turbine output power. The complete system has been simulated for various wind velocities. The control algorithm is implemented on TMS320F243 DSP and the simulated results are validated by experimental results.

Modeling and Analysis of Wind turbine Driven Self-Excited Induction Generator Connected to GridInterface with Multilevel H-Bridge Inverter

“…The dc filter capacitor Cd is assumed to be sufficiently large such that the dc voltage is ripple-free. Under this assumption, the capacitor and dc load can be replaced by a dc voltage source Vd [5]. The value of Vd varies slightly with the loading conditions.…”

“…By increasing the voltage levels of the inverter reduces the switching losses [5]. To connecting the switching devices in parallel connections it leads to higher current levels.…”

MPPT Control Methods in Wind Energy Conversion Systems

“…In [4], the turbine power equation is used for obtaining reference power for PSF based MPPT control of PMSG WECS. Fig.…”

Analysis of Wind Turbine Driven PM Generator with Power Converters

“…Permanent Magnet Generator Model Permanent Magnet Generator provides an optimal solution for varying-speed wind turbines, of gearless or single-stage gear configuration [5]. This eliminates the need for separate base frames, gearboxes, couplings, shaft lines, and pre-assembly of the nacelle.…”

“…The output of the generator can be fed to the power grid directly. A high level of overall efficiency can be achieved, while keeping the mechanical structure of the turbine simple [5]. …”