Frekvenční měniče Katalogy, manuály (EN+CZ)

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

Strana 696 z 825







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For more than two decades, ABB has been pioneering the developm ent VSI-based medium voltage drives. Besides excellent efficiency and reliability, diode bridges feature high power factor (typically >0. In addition, thyristor rectifier has worse power factor the supply side and typically needs additional com pensation equipment. The CSI topology either uses thyristor rectifier active rectifier unit with self-commutated components, which are inherently less reliable and efficient. Today, the VSI the preferred topology the market. Furthermore, the VSI topology has more superior dynamic control performance than the CSI topology. 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 . 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.95), which constant over the whole speed range. Until then the power switches for medium voltage drives had been either GTOs or IGBTs. A VSI allows very reliable and highly efficient input rectifier topology means simple diode bridge. For medium voltage applications such devices led compromises design that increase cost and complexity high-powered drives. IGCT-based high-powered medium voltage drives are ore reliable than edium voltage drives using IGBTs they require fewer power semiconductors. IGCT In 1996 ABB introduced IGCT (Integrated Gate Commutated Thyristor) semiconductors, fast switching power switches that have inherently low losses.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. Advantages VSI A VSI can implemented without the need for additional input output filters, which are a must CSI topology with self-commutated semiconductors