Journal ArticleDOI
Three-Vector-Based Low-Complexity Model Predictive Direct Power Control Strategy for PWM Rectifier Without Voltage Sensors
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TLDR
A novel control scheme based on an optimal application of three voltage vectors in a symmetrical way, which takes advantage of advanced PWM techniques and the virtual flux-based control scheme is introduced to achieve voltage sensorless control.Abstract:
A voltage sensorless control of low-complexity model predictive direct power control (LC-MPDPC) for pulsewidth modulation (PWM) rectifier is proposed. The conventional LC-MPDPC adopts one or two voltage vectors during one control period, which achieve good steady-state performance and quick dynamic response. In addition, based on the mathematical model of the real system, the conventional method only requires one prediction to find the optimal voltage vector, which reduces the control complexity and computational burden. However, the use of one or two vectors during one sampling interval presents abundant current harmonics and high power ripples, and the switching frequency is variable. In order to solve these problems while preserving all the advantages of the conventional LC-MPDPC, this paper presents a novel control scheme, with the aim of operating at a constant switching frequency and obtaining an excellent steady-state performance at a low switching frequency. The proposed method is based on an optimal application of three voltage vectors in a symmetrical way, which takes advantage of advanced PWM techniques. Furthermore, the virtual flux-based control scheme is introduced to achieve voltage sensorless control. The proposed strategy is compared with the conventional MPDPC methods and its effectiveness is confirmed by both simulation and experimental results from a three-phase PWM rectifier under 1000-W operation condition.read more
Citations
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Journal ArticleDOI
Modulated Model-Free Predictive Control With Minimum Switching Losses for PMSM Drive System
TL;DR: A modulated model-free predictive control with minimum switching losses (MSL-MMFPC) is proposed to improve the steady-state performance and reduce the switching losses for a permanent magnet synchronous motor (PMSM) drive system.
Journal ArticleDOI
A Model Predictive Control Method for Grid-Connected Power Converters Without AC Voltage Sensors
TL;DR: A model predictive control strategy for grid-connected power converters is proposed in this article to reduce the current ripples without using ac voltage sensors, and a double-voltage vector-based MPC strategy is proposed based on the principle of the modulated MPC.
Journal ArticleDOI
Model Predictive Direct Power Control With Fixed Switching Frequency and Computational Amount Reduction
TL;DR: A new cost function and four steps’ MPDPC (FSMPDPC) scheme for T-type inverters and the proposed algorithm eases the computational burden of the digital signal processor (DSP).
Journal ArticleDOI
Virtual Flux Estimation for Sensorless Predictive Control of PWM Rectifiers Under Unbalanced and Distorted Grid Conditions
TL;DR: Results demonstrate that the startup procedure reduces settling time and avoids over currents; the VF-PDPC achieves better current waveforms than those obtained by the conventional PDPC under unbalanced grid conditions; the NN-VF estimator presents similar dynamic performances as the second-order generalized integrator that uses grid voltages measurement.
Journal ArticleDOI
Double-Vector Model-Free Predictive Control Method for Voltage Source Inverter With Visualization Analysis
TL;DR: In this article , a double-vector model-free predictive control (MFPC) method for voltage source inverters with visualization analysis is proposed, where the ultralocal model of the VSI is established and a full-order sliding model observer is designed to estimate the lumped disturbance.
References
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Direct power control of PWM converter without power source voltage sensors
TL;DR: In this paper, the authors proposed a novel power control strategy for a PWM converter with no power-source voltage sensors, which has two main features to improve a total power factor and efficiency.
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PWM regenerative rectifiers: state of the art
TL;DR: This work presents the state of the art in the field of regenerative rectifiers with reduced input harmonics and improved power factor, showing that PWM regenerativerectifiers are a highly developed and mature technology with a wide industrial acceptance.
Proceedings ArticleDOI
Virtual flux based direct power control of three-phase PWM rectifiers
TL;DR: In this article, the authors proposed a direct power control (DPC) of three-phase pulsewidth-modulated rectifiers without line voltage sensors, which is based on virtual flux (VF) estimation.