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A paper describes cooperation of the standalone doubly fed induction generator with an energy storage or auxiliary power unit coupled with the DC bus of the main back-to-back power electronics converter. The control method and the energy management of the energy storage coupled through a bidirectional DC/DC converter with a DC-link of the main back-to-back converter is proposed. The control method...
This paper presents a control strategy, which allows doubly-fed induction generator (DFIG) to generate a sinusoidal stator currents and minimize an electromagnetic torque oscillations under unbalanced grid conditions. The control does not require a positive and negative sequence decomposition of the control variables, so the independent control of positive and negative sequence is not used. Instead...
The paper presents control method of rotor converter in variable speed DFIG based power generation system supplying nonlinear load. Control method allows to obtain high quality stator voltage without rotor speed or position. The method uses PLL structure for frequency control, PI controller for stator voltage amplitude regulation and separate controllers for reduction of harmonics in the frames connected...
The paper presents a method of the power management in a DC microgrid suported by supercapacitor as an energy storage. Power management method is presented in an example system consisting of a variable speed power generation system with a permanent magnet generator PMG, power electronics converter between PMG and DC link, and additional converter between DC link and energy storage. The system is loaded...
A stand-alone power system with a doubly fed induction generator DFIG is described. A Direct Voltage Control DVC for the stand alone operation is based on the stator voltage vector represented in rotating polar frame. A synchronization of the produced stator voltage vector with a reference voltage vector produces an output signal, used as a reference rotor current angular speed. This way the control...
In this letter, a stand-alone power system with doubly fed induction generator is described. Direct voltage control based on the stator voltage vector, represented in rotating polar frame, does not need any feedback from the rotor speed or position. Using positive- and negative-sequence components, an unbalanced load can be supplied
A stand alone power generation system with doubly fed induction generator and its control method is presented in the paper. A slip-ring induction generator is equipped with the stator connected capacitances for filtering the switching frequency harmonics produced by the rotor connected power electronics converter. The proposed direct voltage control method, based on the stator voltage vector reference,...
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