Abstract
Windmills (WMs) equipped with permanent magnet synchronous generators (PMSGs) are widely used in modern wind power engineering applications. A grid WM equipped with a PMSG uses power converters for converting all electric power generated in the entire variation ranges of wind velocity and generator rotation frequency. The power converter connected on the generator side controls the generator’s active power supplied to the grid by means of the maximal power point tracing (MPPT) algorithm, and the power converter connected on the grid side controls the DC voltage and reactive power. For analyzing and studying the operation modes of a grid WM equipped with a PMSG, and for estimating the possibilities of controlling the generator rotation frequency under the conditions of variable wind velocity and generator rotation frequency with the optimal level of power supplied to the grid, all electric power components of the WM are modeled on a computer using available and newly developed systems in the MATLAB environment. The developed control algorithms implement control of the generator stator current zero direct component for monitoring the power converter connected to the generator, control of wind wheel blades position, and oriented control with respect to the grid voltage phasor for monitoring the power converter connected to the grid. The modeling results have shown that the model of the considered WM equipped with a PMSG developed in the MATLAB environment is able to perform full-scale power conversion from 0.068 p.u. to 0.985 p.u. with an average error of 2.58% with the wind velocity varying from its initial value equal to 5 m/s to the nominal value equal to 12 m/s and makes it possible to control the generator rotation frequency in the full range from 0.409 p.u. to 0.995p.u. with a percentage error of 0.91%. Thus, the model of the considered WM equipped with a PMSG developed in the MATLAB environment is adequate and can be used for reliably modeling the operation modes of a WM equipped with a PMSG.
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