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Inverter Topologies – Variable Speed Drives

Voltage-source inverter has a configuration where rate of change of voltage (dv/dt) in the inverter is limited by a large capacitor connected in parallel across the DC link. Current-source inverter has a configuration where rate…

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Modes of Operation – Variable Speed Drives

Variable speed drives are capable of operating in 4-quadrant modes of operation. When energy is transferred from the electric motor to the mechanical load, it is operating in motoring mode. These modes take place in…

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Phase Sequence of Harmonics

Harmonics of different orders have different phase sequences. What is phase sequence any way? In simple terms, a phase sequence is the order of rotation of phase vectors relative to each other. Positive sequence has…

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