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Traction application inverter runs in very low switching frequency to reduce switching losses, whereas in case of PMSM as traction applications, there is not a the whole speed range strategy can not only achieve synchronized SVPWM modulation but also transit to six-step mode. Based on zero-sequence voltage injection SVPWM, synchronized modulation and over-modulation methods, this paper put forward...
This paper proposes a grid-connection control strategy for doubly fed induction generator (DFIG) wind power systems based on direct virtual stator active and reactive power control. The proposed control strategy, named as Direct Virtual Power Control (DVPC), is achieved without proportional- integral (PI) regulator. It requires grid voltages, rotor currents, and rotor position information only. Using...
A multiport power electronic transformer (PET) serves as the energy router (ER) of the next generation DC distribution systems. In this paper, control strategies of a multiport PET for DC distribution applications are proposed. Multiple active bridge (MAB) converters serve as the isolation units. Star and ring connected synchronization and communication methods are used in the PET system. After the...
The adjustable-speed drive is attractive for pump, compressor, and other centrifugal load applications due to its flexibility and high operating efficiency, compared with the conventional constant-speed drive system. This paper has developed a converter-based starting method for a doubly fed induction machine (DFIM) with centrifugal loads by constant volts/hertz control, instead of using the additional...
The 400 Hz medium frequency power supply is a key component feeding the critical loads on ships and airplanes. In order to solve some problems met in the existed system, this paper developed a complete mathematical model and operation strategy for the doubly fed induction machine (DFIM) based motor-generator frequency conversion system, including the process of starting, grid synchronization and vector-controlled...
A variable speed constant frequency (VSCF) doubly fed induction generator (DFIG) system using back-to-back converter for wind turbine is described. Based on analysis of stator flux oriented vector control theory of doubly fed induction generator, a maximal power point track (MPPT) and control strategy for the unity power factor of stator output is explored. The paper also discusses the feasibility...
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