In this paper, direct power control (DPC) of three-phase pulsewidth-modulated rectifiers without line voltage sensors is presented. The new system is based on virtual flux (VF) estimation. Theoretical principles of this method are discussed. The steady-state and dynamic behavior of VF-DPC are presented that illustrate the operation and performance of the proposed system compared to a convention...

In this paper direct power control (DPC) strategy is applied to control a doubly fed induction generator (DFIG) based wind energy generation system. A AC/DC/AC converter is controlled by direct power control method. The rotor side converter is controlled by selects appropriates voltage vector based on the instantaneous errors between the reference and estimated values of active and reactive pow...

An integral plus resonant sliding mode direct power control (IRSMC DPC) strategy for voltage source converter high voltage direct current (VSC-HVDC) systems under unbalanced grid voltage conditions is proposed in this paper. Through detailed instantaneous power flow analysis, a generalized power compensation method, by which the ratio between the amplitude of active and reactive power ripples c...

Starting from the principle of instantaneous power theory, this article explores various direct control (DPC) strategies for three-phase two-level pulsewidth modulation (PWM) converters. After summarizing fundamental formula PWM rectifiers, studies operating conventional table-based approach and its related improvements. It further looks into advanced counterparts employing space vector differe...

Voltage and current source inverter are widely used in electrical motor drives. In this drives, DC voltage (or current) are usually provided from phase control or line commutation rectifiers. Because of disadvantage & limitation of this converter, some new topologies are presented in advanced drive such as PWM rectifier. Thanks to well known capabilities of PWM rectifier, classical converter’s ...

The purpose of this study is to enhance the accuracy direct power/torque control (DPC/DTC) applied back-to-back converters supplying a doubly fed induction generator (DFIG) based wind power system. Two solutions are proposed. first one increase degree freedom DTC and DPC by implementing three-level converters. Fuzzy logic second solution performances both conventional control, leading in decrea...

In this paper, an improved Direct Power Control (DPC) algorithm is presented for grid connected three phase PWM rectifiers. The new DPC approach is based on two main tasks. First the optimization of the look-up table, which is well-known in conventional DPC, is outlined for selecting the optimum converter output voltage vectors. Secondly a very simple and effective method is used to directly ca...

This paper proposes a novel direct torque and reactive power control (DTC) for grid-connected doubly fed induction generators (DFIGs) in the wind power generation applications. The proposed DTC strategy employs a variable structure control (VSC) scheme to calculate the required rotor control voltage directly and to eliminate the instantaneous errors of active and reactive powers without involvi...

The major concern in smooth operation of the DFIG wind turbine technology is control of wind turbine generators to ensure stable operation and to avoid sympathetic trips during system imbalances. The operation of the DFIG under different disturbances is analyzed using MATLAB Simulink and the built-in model developed by DIgSILENT in their PowerFactory software. The specific imbalances studied ar...

Acknowledgment First of all, I would like to thank my parents who raise me and support me to do further study in Norway. I appreciate the help from my supervisor Lars Einar Norum and Phd student Hamed Nademi. I benefit a lot from their meticulous attitude to study, abundant knowledge and minded guidance. I am very grateful that NTNU Department of Electric Power Engineering provides very good ha...