Frekvenční měniče Katalogy, manuály (EN+CZ)

| Kategorie: Katalog  | Tento dokument chci!

Vydal: ABB s.r.o, ELSYNN Autor: ABB ELSYnn

Strana 696 z 825







Poznámky redaktora
The CSI topology either uses thyristor rectifier active rectifier unit with self-commutated components, which are inherently less reliable and efficient. In addition, thyristor rectifier has worse power factor the supply side and typically needs additional com pensation equipment. IGCT-based high-powered medium voltage drives are ore reliable than edium voltage drives using IGBTs they require fewer power semiconductors. For medium voltage applications such devices led compromises design that increase cost and complexity high-powered drives. For more than two decades, ABB has been pioneering the developm ent VSI-based medium voltage drives.The evolution ABB’s VSI-MF topology ABB has been driving the evolution state-of-the-art medium voltage drive technologies for more than years. A VSI allows very reliable and highly efficient input rectifier topology means simple diode bridge. Furthermore, the VSI topology has more superior dynamic control performance than the CSI topology. IGCT In 1996 ABB introduced IGCT (Integrated Gate Commutated Thyristor) semiconductors, fast switching power switches that have inherently low losses. 1969 Start drive development 1985 1993 Megastar 3-level PWM drive with vector control Self-healing capacitors 1995 Direct Torque Control (DTC) 1996 Integrated Gate Commutated Thyristors (IGCTs) 8 ACS 5000 ABB . Until then the power switches for medium voltage drives had been either GTOs or IGBTs.95), which constant over the whole speed range. Advantages VSI A VSI can implemented without the need for additional input output filters, which are a must CSI topology with self-commutated semiconductors. Today, the VSI the preferred topology the market. VSI In general, today’s state-of-the-art medium voltage drive products are based one of two basic inverter topologies: Voltage Source Inverter (VSI), employing DC-link capacitor and providing switched voltage waveform, and Current Source Inverter (CSI), employing a DC-link inductor and providing switched current waveform. Besides excellent efficiency and reliability, diode bridges feature high power factor (typically >0