This paper proposes an analysis and a direct power control (DPC) design of a wind turbine driven doubly-fed induction generator (DFIG) under unbalanced network voltage conditions. A DFIG model described in the positiv...This paper proposes an analysis and a direct power control (DPC) design of a wind turbine driven doubly-fed induction generator (DFIG) under unbalanced network voltage conditions. A DFIG model described in the positive and negative synchronous reference frames is presented. Variations of the stator output active and reactive powers are fully deduced in the presence of negative sequence supply voltage and rotor flux. An enhanced DPC scheme is proposed to eliminate stator active power oscillation during network unbalance. The proposed control scheme removes rotor current regulators and the decomposition processing of positive and negative sequence rotor currents. Simulation results using PSCAD/EMTDC are presented on a 2-MW DFIG wind power generation system to validate the feasibility of the proposed control scheme under balanced and unbalanced network conditions.展开更多
Comparison of fixed speed and doubly-fed induction wind turbines during power system disturbances; Comparison of the weak grid dynamic behavior by the WECS connection of different power; Investigation of faults in aut...Comparison of fixed speed and doubly-fed induction wind turbines during power system disturbances; Comparison of the weak grid dynamic behavior by the WECS connection of different power; Investigation of faults in autonomous wind-diesel hybrid energy system by simulation; Investigation of the three phase short circuit in a weak power system including WECS; Mathematical Model of an Asynchronous Generator Taking the Iron Losses into Account; Mathematical modeling of an asynchronous switched generator;展开更多
基金Project (No. 50577056) supported by the National Natural Science Foundation of China
文摘This paper proposes an analysis and a direct power control (DPC) design of a wind turbine driven doubly-fed induction generator (DFIG) under unbalanced network voltage conditions. A DFIG model described in the positive and negative synchronous reference frames is presented. Variations of the stator output active and reactive powers are fully deduced in the presence of negative sequence supply voltage and rotor flux. An enhanced DPC scheme is proposed to eliminate stator active power oscillation during network unbalance. The proposed control scheme removes rotor current regulators and the decomposition processing of positive and negative sequence rotor currents. Simulation results using PSCAD/EMTDC are presented on a 2-MW DFIG wind power generation system to validate the feasibility of the proposed control scheme under balanced and unbalanced network conditions.
文摘Comparison of fixed speed and doubly-fed induction wind turbines during power system disturbances; Comparison of the weak grid dynamic behavior by the WECS connection of different power; Investigation of faults in autonomous wind-diesel hybrid energy system by simulation; Investigation of the three phase short circuit in a weak power system including WECS; Mathematical Model of an Asynchronous Generator Taking the Iron Losses into Account; Mathematical modeling of an asynchronous switched generator;
