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In this paper, a simple and robust speed estimator and Pseudo Derivative Feedback (PDF-PDF) controller are proposed for sensorless PMSM drive to improve its performance at standstill and low speed regions. The speed estimator is formed using stator flux and electromagnetic torque based model reference adaptive system, which performs better during transient conditions and reduces steady state error...
DVR control requires a robust algorithm for computing grid voltage magnitude and phase angle. Conventional SRF-PLL performs poorly as it cannot filter out negative sequence voltages and harmonics that could occur in the grid voltage. In this paper a Positive and Negative Sequence Extractor (PNSE) is formed by a Delayed Signal Cancellation (DSC) filter, which filters harmonics and extracts Instantaneous...
This paper presents a comprehensive evaluation of PI controller and proposed pseudo derivative feedback (PDF) controller based direct torque controlled (DTC) permanent magnet synchronous motor (PMSM) drive. The proposed controller eliminates oscillation and overshoot in the actual rotor speed and significantly reduces the flux, torque and stator current ripples. The performance of the proposed controller...
Accurate estimation of grid phase angle and magnitude is important for effective operation of Dynamic Voltage Restorer (DVR). Under unbalanced voltage sags, the estimated output voltages of a conventional SRF-PLL contain a second harmonic ripple which makes it difficult to control DVR. In this paper a DSOGI pre-filter based PLL is employed to extract the symmetrical components of the grid voltage...
In this paper, a new strategy for the control of terminal voltage and frequency of a stand-alone self-excited induction generator-(SEIG) based wind generator, working with variable speed and load is proposed. With a generalized impedance controller (GIC) (voltage source pulsewidth-modulated inverter with a dc-link battery), a new strategy to maintain the active and reactive power balance at the SEIG...
In this paper space vector pulse width modulation implementation using dSPACE 1104 to control the operation of a generalized impedance controller (GIC) has been explained with the hardware results. The GIC is used for regulating terminal voltage and frequency of a self excited induction generator (SEIG). It consists of an inverter having DC link battery with AC side coupling inductance. A space vector...
In this paper, the analysis of a three-phase self excited induction generator (SEIG) with static VAr compensator (STATCOM) supported with battery energy storage system has been presented. As compared to DC link capacitor provided with the STATCOM, battery energy storage improves system stability and prevents power wastage. This investigation relates to the behavior of the SEIG in presence of STATCOM,...
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