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Multi-pulse converters are suitable for high power application with the merits of low switching frequency (f0) and perfect harmonic performance. But the less controllability and poor regulation has a restriction on its application. This paper proposed an AC-DC/DC-AC converter based on multi-pulse converter's structure which has the same perfect harmonic performance with a low switching frequency (3f...
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...
Several pulsewidth modulation strategies have been proposed for the three-level three-phase neutral-point-clamped DC-AC converter. Among them, the nearest-three virtual-space-vector (NTV2 ) pulsewidth modulation (PWM) guarantees the DC-link capacitor voltage balance under any operating condition, provided that the addition of the three phase currents equals zero. However, this is achieved at the expense...
Voltage source PWM rectifiers connected to the AC grid are increasingly used in different applications like stand alone power supplies, high-efficiency regenerative AC drives and grid-connected renewable energies. Fast dynamics, sinusoidal input current, and unity power factor justify its wide application. The overall system performance is strongly dependent on the PWM rectifier characteristics. The...
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