Tese
Controle sem sensores mecânicos para gerador síncrono a ímã permanente
Fecha
2015-07-29Registro en:
BERNARDES, Thiago Araújo. Sensorless control of permanent magnet synchronous generator. 2015. 255 f. Tese (Doutorado em Engenharia Elétrica) - Universidade Federal de Santa Maria, Santa Maria, 2015.
Autor
Bernardes, Thiago Araújo
Institución
Resumen
This Thesis proposes sensorless vector control schemes that combine designed
observers in the discrete-time domain to estimate the rotor position and speed for a
permanent magnet synchronous generator of non-salient poles. Two control schemes are
proposed. The first scheme is based on a discrete sliding mode current observer in series
with an adaptive electromotive force observer. Then, the sliding conditions that assure
the sliding motion around the sliding surface are derived to ensure the stability of the
current observer as well as an innovative design procedure is proposed for it. Moreover,
the electromotive force observer is designed using Lyapunov s Discrete Direct Method,
which provides the estimated rotor position and speed. The second scheme extends
the developed methodology for the former, considering the parametric uncertainties and
eliminating the high frequency components of chattering. The second scheme uses a
discrete sliding mode current observer as in the first scheme. However, the electromotive
force observer is replaced by a phase-locked loop in series with a discrete sliding mode
robust differentiator, which follows the proposed methodology for the discrete sliding mode
current observer. Experimental results validate the theoretical analysis and demonstrate
the performance of the proposed control schemes considering a small scale wind energy
conversion system. In addition, proposed schemes are compared with others of the
literature. It should be noticed that the whole approach is carried out in discrete time
domain making it suitable for a microcontroller or digital signal processor implementation.