Abstract
In this paper, a new virtual flux (VF) based predictive direct power control (VF_PDPC) applied for three-phase pulse width modulation (PWM) rectifier is proposed. The virtual flux estimation is performed using a pure integrator in series with a new adaptive algorithm in order to cancel dc offset and harmonic distortions in the estimated VF. The introduced structure is able to produce two virtual flux positive sequence components orthogonal output signals under unbalanced and distorted voltage conditions. The main features of the proposed virtual flux estimator are, it's simple structure, accuracy, and fast VF estimation over the excited integrators. Therefore, the estimated VF is then used for robust sensorless VF-PDPC with a constant switching frequency using space vector modulation (SVM) and tested through numerical simulations. The instantaneous active and reactive powers provided by orthogonal (VF) positive sequence components are directly controlled. More importantly, this configuration gives quasi-sinusoidal and balanced current under different input voltage conditions without using the power compensation methods. The results of the simulation confirmed the validity of the proposed virtual flux algorithm and demonstrated excellent performance under different input voltage conditions, complete rejection of disturbances.
Highlights
Grid-tied three-phase pulse width modulation (PWM) rectifiers are commonly used in numerous industrial applications
SIMULATION RESULTS To test the validity of the proposed VF_PDPC strategy, several simulation tests were conducted under different operating conditions
This paper presents the mathematical analysis and numerical implementation of a predictive direct power control based on the new virtual flux method (VF_PDPC) for three-phase PWM rectifiers
Summary
Grid-tied three-phase PWM rectifiers are commonly used in numerous industrial applications. The authors in [16] propose a new PDPC control concept based virtual flux that can ensure grid voltage sensorless function for the PWM rectifier, regulation of input active and reactive powers and a constant switching frequency operation have been successfully implemented. Authors in [9] developed a new sensorless VF-PDPC strategy for the PWM rectifier application based on a natural filter integrator (NF-I) combined with an adaptive linear neural filter with a multi-output neural (ADALINE),to ensure that the grid currents emulate the desirable sinusoidal waveform even when the voltage supply is unbalanced and/or harmonized. The VF algorithm has an open-loop structure and uses the output fundamental orthogonal signals which are obtained directly from estimating the fundamental active and reactive powers This method provides a quasisinusoidal input current waveforms under different input voltage conditions and achieved good stability, improve the performance of the VF_PDPC
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