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Irrigation pumping system that marks a sizeable load on the grid is generally blind on assessment of peak demand hours, while in operation. Such operation if smartly controlled may avoid shedding of some connected loads to match power demand. Moreover, due to the accessibility of only single-phase supply, the rural pump three-phase loads are supplied through either by splitting ac single phase into...
Dual three-phase (asymmetrical six-phase) induction motors have received significant attention in high power medium voltage drive applications. Typically, two three-phase voltage source converters are needed to feed such a drive system. In medium voltage applications, multilevel inverters are preferred as they provide a stepped output voltage waveform that reduces dv/dt stresses and provides a better...
A system is described whereby floating capacitor H-bridge converters are located in each phase between the utility grid and a squirrel cage induction motor. Injecting a series voltage in each phase, the power electronics can be used to control the motor voltage during starting and hence limit the motor starting current to the desired level. The motor voltage can also be used under steady-state operation...
This paper presents a control technique for smoothing voltage oscillations in the sub-modules of Modular Multilevel Converter during start-up operations of high-power medium-voltage induction motor drive. At steady-state, the power fluctuations in each sub-module at fundamental and 2nd harmonic frequencies generate capacitor voltage oscillations which are much higher as the current frequency decreases...
Cascaded neutral point clamped (NPC) inverter is more suitable for high voltage, high power applications, but the power and voltage balances are crucial in practical uses. This paper proposes an effective SPWM control scheme for a cascaded NPC inverter in which a pulse rotation is fulfilled for all modulation indices. The module voltage and power, and series- capacitor voltage of each module are perfectly...
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