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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...
The principle of position estimation and sensorless control of a matrix converter fed permanent magnet synchronous motor (PMSM) has been reported before, where the current derivatives of motor line currents were measured by di/dt sensors to construct position signals. This paper presents a different implementation that eliminates the di/dt sensors. The current derivatives are calculated by measuring...
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...
The paper introduces a new scheme to track the rotor position of an induction motor. The scheme uses the measurement of current derivatives during null switching vectors of a standard PWM scheme and reduces the minimum pulse widths required to allow high frequency switching oscillations to die down. The motor current distortion is therefore also reduced. The method uses H-Bridges connected in series...
This paper investigates the use of energy storage added to a shunt active filter configuration in order to enhance its operation in maintaining power quality conditioning at a particular part of a grid system. The specific application considered is for a microgrid. In the proposed configuration the shunt active filter with energy storage (SAFES) can supply both reactive and real power for a short...
This paper proposes a new protection scheme for marine power systems (MPS). The scheme exploits the increased use of power electronic devices to provide a useful complement to traditional protection strategies which can also provide the necessary back up protection during extreme protection failure, without the need for communication channels. The scheme is described for an AC zonal Advanced Power...
This paper describes a sensorless position estimation method of a permanent magnet motor fed from a three-phase matrix converter using only its space vector PWM (SVPWM) sequence. The scheme employs measurements of the di/dt of the motor line currents to construct orthogonal ldquoresolver likerdquo position signals. In principle, the SVPWM waveforms provide sufficient excitation to extract the position...
On marine distribution systems traditional protection schemes often fail to provide the necessary reliability and discrimination. In this paper, a novel protection scheme for a zonal system, as proposed for marine applications, is presented based on active impedance estimation. The power system impedance is measured by injecting a very short current transient onto the network via a coupling inductance...
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