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A new control method for active filters based only on voltage detection at the Point of Common Coupling (PCC) is proposed. This technique allows using the active filter as a plug-and-play sensorless device, as it is possible to compensate the harmonics produced by the distorting loads just by measuring the PCC voltage, without needing to measure the distorting load current, and just with an approximate...
A sensorless control system for a surface mounted permanent magnet (PM) machine is developed which uses measurement of motor current derivative during the fundamental PWM vector excitation only. Vector extension is required when the vector width falls below a minimum time duration. The extension is made to allow the high frequency switching oscillations due to parasitic capacitances in the drive to...
This paper presents the application of a controller based on state space design for a shunt active filter with energy storage (SAFES) within a local power supply network in the presence of distributed generation. The aim is to guarantee voltage regulation and harmonic cancellation at the load site caused by a load step change or harmonic distortion. To achieve this objective, the SAFES is controlled...
This paper presents a complete scheme for simulation of single-phase transformers with internal faults. Traditional methods may not be effective in displaying hysteretic characteristics in the transformer core. The approach in this paper uses transmission line method (TLM) incorporating Jiles-Atherton model to introduce nonlinear hysteresis. A small 25 kVA 11 kV/220 V power transformer with turn-to-earth...
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