Abstract
A specific structure of control system with double fed machine (DFM) is studied in the paper. The DFM is assumed to be a generator with stator winding connected to the power grid and it produces active and reactive powers. A command vector controlling DFM is transformed to the rotor-oriented coordinate system using angle of transformation. The angle of transformation is estimated in the system by applying a phase locked loop (PLL).Moreover, an example of application of pulse phase locked loop for estimation of voltage vector components is presented in the paper. In conclusion the properties of proposed PLL-based control systems are compared with properties of systems known from radio engineering and telecommunications described in the first chapter of the paper.
Highlights
The doubly fed induction machine (DFM) is suitable for generating systems working with variable rotor velocity
A rotor position sensor is omitted in the structure of the considered DFM control system. This is the most valuable advantage resulting from the application of phase locked loop (PLL) in the DFM control systems
Two examples of application of phase locked loop in control system with double fed machine are presented in the paper
Summary
The doubly fed induction machine (DFM) is suitable for generating systems working with variable rotor velocity. PLL equalizes frequency of voltage-controlled oscillator (VCO) with standard frequency. E. allowable deviation of standard frequency from rest frequency (Δf ϭ f1 Ϫ f0) for which the circuit shown in Fig. 2 still reaches synchronism, is limited by maximal and minimal value of voltage uF. As it results from dependence (2), in the circuit shown in Fig. 2 mentioned values are determined for arguments φ equal to 0 and π while the rest value of angle φ amounts to π/2.
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