Journal ArticleDOI
A Modified Feedback Scheme Suitable for Repetitive Control of Inverter With Nonlinear Load
Naveenkumar Marati,Dinkar Prasad +1 more
TLDR
In this paper, a new output voltage feedback scheme has been proposed, which simplifies the requirement of digital compensation, and the proposed circuit turns out to be more energy efficient in comparison to few popular schemes, reported in literature.Abstract:
It is mandatory to keep the total harmonic distortion in the output of most inverters below the limits prescribed by different international standards. The harmonic distortions caused due to nonlinear loads may not get corrected by typical magnitude controller, like PID controller. Repetitive controller is more effective in such situations. Often, repetitive controller is used as add-on block to the conventional magnitude controller. Design of repetitive controller can be easily implemented on digital platform. Rapid change in phase and magnitude of inverter-filter's transfer function near corner frequency causes instability problems in repetitive controller. Various techniques have been proposed by researchers to overcome this problem. Most of the reported techniques rely on digital compensation. However, it is hard to find a digital compensator, which simultaneously meets the phase and gain requirements at moderate computational effort. Here, a new output voltage feedback scheme has been proposed, which simplifies the requirement of digital compensation. The proposed scheme requires an extra hardware but at negligible added cost. In spite of this extra hardware, the proposed circuit turns out to be more energy efficient in comparison to few popular schemes, reported in literature, where some resistance is introduced in the inverter's filter for better stability of controller. In addition to the proposed modification the paper presents a simplified explanation of the various factors affecting stability of repetitive controller. The paper also discusses a novel experimental method for verifying the efficacy of repetitive controller in suppressing distortion of any particular harmonic order.read more
Citations
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Journal ArticleDOI
Lyapunov Energy Function Based Control Method for Three-Phase UPS Inverters With Output Voltage Feedback Loops
TL;DR: A modification has been performed on the traditional Lyapunov-energy-function-based control by incorporating the output voltage feedback loops in the control variables, which offers strong robustness against variations in LC filter parameters, high-quality sinusoidal output voltage along with acceptable total harmonic distortion values under linear and nonlinear loads.
Journal ArticleDOI
Duty-Ratio Feedforward Controller Design to Minimize the Capacitor Effect of the Flyback Inverter Under the Light-Load Condition
TL;DR: The proposed method improves the displacement factor as well as the distortion factor, so the flyback inverter with the SR circuit has high power quality and is demonstrated in experiments with a 120-W rated power prototype.
Journal ArticleDOI
Internal Model Principle Method to Robust Output Voltage Tracking Control for Single-Phase UPS Inverters With Its SPWM Implementation
TL;DR: In this paper, a robust controller is designed to drive a $LC$ -filter to operate with an adjustable amplitude, and adaptive resonant frequency, and the proposed controller basically employs an internal model with a filter to examine the incremental dynamics of the voltage tracking error, and regulate the voltage modulating signal in sine pulse width modulation (SPWM).
Journal ArticleDOI
Optimal Performance Design Guideline of Hybrid Reference Frame Based Dual-Loop Control Strategy for Stand-Alone Single-Phase Inverters
TL;DR: A systematic parameter design guideline is proposed to ensure the system stability and optimize the performance of the system under control delay condition and the experimental results are presented to validate the effectiveness of the presented optimal control parameter design methodologies.
Journal ArticleDOI
Design of robust self-tuning regulator adaptive controller on single-phase full-bridge inverter
TL;DR: A self-tuning adaptive control method along with a novel robust procedure to system identification which is applied to a single-phase full-bridge Inverter with LC filter by Pulse Width Modulation (PWM).
References
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Journal ArticleDOI
Zero Phase Error Tracking Algorithm for Digital Control
TL;DR: In this article, a digital feed-forward control algorithm for tracking desired time varying signals is presented, which is particularly suited to the general motion control problems including robotic arms and positioning tables.
Journal ArticleDOI
Analysis and Synthesis of Discrete-Time Repetitive Controllers
Journal ArticleDOI
Direct repetitive control of SPWM inverter for UPS purpose
TL;DR: In this paper, a novel repetitive controller directly combined with an open loop SPWM inverter is presented, which achieves low THD% (1.4-1.7%) with nonlinear loads and fast error convergence (3-5 fundamental periods).
Journal ArticleDOI
Digital control of repetitive errors in disk drive systems
Kok Kia Chew,Masayoshi Tomizuka +1 more
TL;DR: A modified prototype repetitive controller is applied as a plug-in module to a Winchester disk drive with a preexisting analog feedback controller to demonstrate its efficacy in the reduction of this periodic component.
Journal ArticleDOI
Robust adaptive and repetitive digital tracking control and application to a hydraulic servo for noncircular machining
Tsu-Chin Tsao,Masayoshi Tomizuka +1 more
TL;DR: In this paper, the authors present the development of robust digital tracking control algorithms and their real-time implementation on an electrohydraulic servo-actuator for tool positioning in norcircular machining.