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This paper proposes a coordinated control strategy of the rotor side converter (RSC) and grid side converter (GSC) of the doubly-fed induction generator (DFIG) based wind generation systems under unbalance voltage conditions. Mathematical models and system behaviors of the RSC and GSC under unbalanced voltage are illustrated. The reason why the rotor side converter has its limitation can be obtained...
A novel high-frequency isolated grid-connected PV inverter based on sinusoidal pulse width position modulation (SPWPM) is studied. It is suitable for household PV utility with advantages of light weight, small volume and high efficiency. The working principle is analyzed in details and a close loop control strategy is designed. In order to eliminate the grid-connected current distortion caused by...
This paper analyzes the transition characteristic of the doubly-fed induction generator (DFIG) during the grid fault, and the approximate short current calculation which is based on the fifth-order DFIG model is also introduced to support the analysis. A novel method which is easier and more accurate than the past ones is proposed to verify the low voltage ride through (LVRT) characteristic of the...
This paper proposes a four-multiple pulse width modulation (PWM) converter for grid interface, which is apply to the variable-speed constant-frequency direct-drive wind turbine systems. The paper introduces the principle of PWM converter, in order to improve DC voltage utilization, space vector pulse width modulation (SVPWM) technology is adopted. Then the advantages of the multiple based on carrier...
Within various topologies of variable-speed wind turbine systems, PWM converters are employed either as grid interface or as motor dive or both. According to the particular requirements for dynamic response of MPPT and utility grid connection, a real-time control strategy adopting instantaneous current regulation with ac-side voltage feedforward correction is proposed. The mathematical model of the...
In direct-drive wind turbine systems, a dual PWM converter for grid interface and its control strategy are presented. Following introducing the full-size AC-DC-AC converter, the principle and advantages of the dual inverter are analyzed. With the proposed method it not only divides high-level currents, making existing equipments apply to large-scale systems, but also reduces the current ripple amplitude...
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