The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform
Keliang Zhou - One of the best experts on this subject based on the ideXlab platform.
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A novel repetitive controller for nk±m order Harmonics compensation
Proceedings of the 30th Chinese Control Conference, 2011Co-Authors: Wenzhou Lu, Keliang ZhouAbstract:This paper presents a novel repetitive control (RC) scheme called nk±m order Harmonic repetitive control (nk±m RC), which provides a universal formula for various RC schemes, such as regular RC, Odd-Harmonic RC, 6k±1 order Harmonic RC, and so on. The proposed control scheme can achieve zero-error tracking or perfect disturbance rejection for any specific nk±m order Harmonics. Compared with the regular RC, nk±m RC occupies less data memory and offers faster error convergence rate. It also yields very low total Harmonics distortion (THD) and very high tracking accuracy. An application example of nk±m RC controlled three-phase PWM inverter demonstrates the effectiveness of the proposed nk±m RC scheme.
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Robust Odd-Harmonic repetitive controller for three-phase CVCF PWM inverters
2011 International Conference on Electrical Machines and Systems, 2011Co-Authors: Yunhu Yang, Keliang Zhou, Ming Cheng, Wenzhou LuAbstract:In this paper, a robust Odd-Harmonic repetitive control (RORC) scheme which combines robust feedback control with Odd-Harmonic repetitive control (ORC) is proposed for three-phase constant-voltage-constant-frequency (CVCF) pulse-width modulated (PWM) inverters. Experiment results show that robust Odd-Harmonic repetitive controlled inverter produces high quality output voltage with good robustness and fast dynamic response even in the presence of nonlinear loads and sudden load changes. It provides a fast, robust and accurate high performance control solution to power converters.
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Odd-Harmonic repetitive control of single phase active power filter
CICED 2010 Proceedings, 2010Co-Authors: Yunhu Yang, Keliang Zhou, Wenzhou LuAbstract:An Odd-Harmonic repetitive control (ORC) scheme is proposed for shunt active power filter (APF) to eliminate the dominant Harmonic currents caused by nonlinear loads and compensate reactive currents. Compared with conventional RC, Odd-Harmonic RC can achieve high tracking accuracy with faster error convergence rate and smaller data memory size. Simulations results are provided to verify the validity of the proposed control scheme.
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Plug-In Dual-Mode-Structure Repetitive Controller for CVCF PWM Inverters
IEEE Transactions on Industrial Electronics, 2009Co-Authors: Keliang Zhou, Danwei Wang, Bin Zhang, Yigang WangAbstract:Repetitive control (RC) is found to be a high-performance control scheme for constant-voltage constant-frequency (CVCF) pulsewidth-modulated (PWM) converters to eliminate output total Harmonic distortion. In this paper, a dual-mode-structure RC (DMRC) is proposed to further improve the control performance of RC. The proposed DMRC controller comprises of two paralleled periodic signal generators: an Odd-Harmonic one and an even-Harmonic one. Without additional complexity and loss of tracking accuracy, DMRC can achieve a faster error convergence rate than the conventional RC does. Moreover, the tracking accuracy of DMRC is higher than that of Odd-Harmonic RC. In the presence of nonlinear load disturbances and parameter uncertainties, an application example of a DMRC-controlled single-phase PWM inverter is provided to evaluate the proposed DMRC scheme. Systematical experimental results show the effectiveness and superior advantages of the DMRC approach.
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A Novel Repetitive Controlled 3-Phase CVCF PWM Inverter for UPS
IECON 2007 - 33rd Annual Conference of the IEEE Industrial Electronics Society, 2007Co-Authors: Keliang Zhou, Danwei Wang, Ramon Costa-castellóAbstract:A novel repetitive control scheme which adopts zero-phase compensated Odd-Harmonic signal generator, is proposed for three-phase CVCF PWM inverters to simplify the implementation of repetitive controller and track sinusoidal reference signals at much faster convergence rate and high tracking accuracy (very low THD). The simulation results verify the effectiveness of the proposed scheme.
Ramon Costa-castelló - One of the best experts on this subject based on the ideXlab platform.
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CDC - Second-order Odd-Harmonic repetitive control and its application to active filter control
49th IEEE Conference on Decision and Control (CDC), 2010Co-Authors: Ramon Costa-castelló, Germán A. Ramos, Maarten SteinbuchAbstract:High order repetitive control has been introduced to overcome performance decay of repetitive control systems under varying frequency of the signals to be tracked/rejected or improving the interhamonic behavior. However, most high order repetitive internal models used to improve frequency uncertainty are unstable, as a consequence practical implementations are more difficult. In this work a stable, second order Odd-Harmonic repetitive control system is presented and studied. The proposed internal model has been implemented and validated in a shunt active filter current controller. This high order controller allows dealing with the grid frequency variations without using adaptive schemes.
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CCA - Odd-Harmonic repetitive control of an active filter under varying network frequency: Practical considerations
2010 IEEE International Conference on Control Applications, 2010Co-Authors: Ramon Costa-castelló, Germán A. Ramos, Rafel Cardoner-parpalAbstract:This work deals with the design and analysis of a controller for a shunt active power filter. The design is based on combined feedforward and feedback actions, the last using Odd-Harmonic repetitive control, and aims at obtaining good closed-loop performance in spite of the possible frequency variations that may occur in the electrical network. As these changes affect the performance of the controller, the proposal includes a compensation technique consisting of an adaptive change of the sampling time of the digital controller according to the network frequency variation. However, this implies structural changes in the closed-loop system that may eventually destabilize it. Hence, this article is also concerned with closed-loop stability of the resulting system, which is analyzed using a robust control approach that takes advantage of the small gain theorem. Experimental results reporting good performance of the closed-loop system are provided.
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Robust high-order repetitive control of an active filter using an Odd-Harmonic internal model
2010 IEEE International Symposium on Industrial Electronics, 2010Co-Authors: Germán A. Ramos, Ramon Costa-castelló, Rafel CardonerAbstract:Shunt active power filters have proven to be an efficient means to compensate for the negative effects of nonlinear and reactive loads on the power quality of the electrical distribution network. In this context, the control objective is to achieve a power factor close to 1, as well as load current Harmonics and reactive power compensation. A useful control strategy for this purpose is repetitive control. However, the performance of repetitive controllers is strongly affected by frequency variations of the involved signals. This work analyzes the effect of such variations and describes the architecture of an Odd-Harmonic, high-order repetitive controller specifically designed to obtain robust closed-loop performance against frequency variations that may occur in the electrical network.
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Odd-Harmonic repetitive control of an active filter under varying network frequency: Practical considerations
Proceedings of the IEEE International Conference on Control Applications, 2010Co-Authors: Ramon Costa-castelló, J.M. Olm, Germán A. Ramos, Rafel Cardoner-parpalAbstract:This work deals with the design and analysis of a controller for a shunt active power filter. The design is based on combined feedforward and feedback actions, the last using Odd-Harmonic repetitive control, and aims at obtaining good closed-loop performance in spite of the possible frequency variations that may occur in the electrical network. As these changes affect the performance of the controller, the proposal includes a compensation technique consisting of an adaptive change of the sampling time of the digital controller according to the network frequency variation. However, this implies structural changes in the closed-loop system that may eventually destabilize it. Hence, this article is also concerned with closed-loop stability of the resulting system, which is analyzed using a robust control approach that takes advantage of the small gain theorem. Experimental results reporting good performance of the closed-loop system are provided. © 2010 IEEE.
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Second-order Odd-Harmonic repetitive control and its application to active filter control
49th IEEE Conference on Decision and Control (CDC), 2010Co-Authors: Ramon Costa-castelló, Germán A. Ramos, Maarten SteinbuchAbstract:High order repetitive control has been introduced to overcome performance decay of repetitive control systems under varying frequency of the signals to be tracked/rejected or improving the interhamonic behavior. However, most high order repetitive internal models used to improve frequency uncertainty are unstable, as a consequence practical implementations are more difficult. In this work a stable, second order Odd-Harmonic repetitive control system is presented and studied. The proposed internal model has been implemented and validated in a shunt active filter current controller. This high order controller allows dealing with the grid frequency variations without using adaptive schemes.
Yigang Wang - One of the best experts on this subject based on the ideXlab platform.
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Plug-In Dual-Mode-Structure Repetitive Controller for CVCF PWM Inverters
IEEE Transactions on Industrial Electronics, 2009Co-Authors: Keliang Zhou, Danwei Wang, Bin Zhang, Yigang WangAbstract:Repetitive control (RC) is found to be a high-performance control scheme for constant-voltage constant-frequency (CVCF) pulsewidth-modulated (PWM) converters to eliminate output total Harmonic distortion. In this paper, a dual-mode-structure RC (DMRC) is proposed to further improve the control performance of RC. The proposed DMRC controller comprises of two paralleled periodic signal generators: an Odd-Harmonic one and an even-Harmonic one. Without additional complexity and loss of tracking accuracy, DMRC can achieve a faster error convergence rate than the conventional RC does. Moreover, the tracking accuracy of DMRC is higher than that of Odd-Harmonic RC. In the presence of nonlinear load disturbances and parameter uncertainties, an application example of a DMRC-controlled single-phase PWM inverter is provided to evaluate the proposed DMRC scheme. Systematical experimental results show the effectiveness and superior advantages of the DMRC approach.
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Zero-phase Odd-Harmonic repetitive controller for a single-phase PWM inverter
IEEE Transactions on Power Electronics, 2006Co-Authors: Keliang Zhou, Danwei Wang, Bin Zhang, Yigang WangAbstract:In this paper, a zero-phase Odd-Harmonic repetitive control scheme is proposed for pulse-width modulation inverters. The proposed repetitive controller combines an Odd-Harmonic periodic generator with a noncasual zero-phase compensation filter. It occupies less data memory than a conventional repetitive controller does. Moreover, it offers faster convergence of the tracking error, and yields very low total Harmonics distortion (THD) and low tracking error. Analysis and design of the proposed system are presented. Experimental results with the proposed repetitive controller are presented to validate the approach. The phenomena of even-Harmonic residues in the proposed control system is discussed and experimentally demonstrated.
Ramon Costacastello - One of the best experts on this subject based on the ideXlab platform.
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Odd Harmonic high order repetitive control
2013Co-Authors: Germán A. Ramos, Ramon CostacastelloAbstract:HORC is mainly used to improve the repetitive control performance robustness under disturbance/reference signals with varying or uncertain frequency. Unlike standard repetitive control, the HORC involves a weighted sum of several signal periods. With a proper selection of the associated weights, this high order function offers a characteristic frequency response in which the high gain peaks located at Harmonic frequencies are extended to a wider region around the Harmonics. Furthermore, the use of an Odd-Harmonic internal model will make the system more appropriate for applications where signals have only Odd-Harmonic components, as in power electronics systems. This Chapter presents an Odd-Harmonic High Order Repetitive Controller suitable for applications involving Odd-Harmonic type signals with varying/uncertain frequency. The open loop stability of internal models used in HORC and the one presented here is analysed. Additionally, as a consequence of this analysis, an anti-windup scheme for repetitive control is proposed.
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analysis and design of a robust Odd Harmonic repetitive controller for an active filter under variable network frequency
Control Engineering Practice, 2012Co-Authors: Germán A. Ramos, Ramon CostacastelloAbstract:Abstract Frequency variations in the electrical network may cause a dramatic performance decay in repetitive controlled active filters intended to remove Odd-Harmonic distortion in single-phase AC loads. This work presents an Odd-Harmonic repetitive controller for a shunt active power filter that addresses such a performance problem. This is achieved by means of an adaptive change of the sampling period of the digital controller. However, this action implies structural changes that may result in an overall destabilization of the closed-loop system. Hence, a small-gain theorem-based robust control design technique allows to obtain a controller which assures BIBO stability in the required sampling period interval. Experimental results validate the proposal.
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technical communique digital repetitive plug in controller for Odd Harmonic periodic references and disturbances
Automatica, 2005Co-Authors: Robert Grino, Ramon CostacastelloAbstract:This work develops a digital repetitive plug-in controller for Odd-Harmonic discrete-time periodic references and disturbances. The controller presents a novel structure and it has a lower data memory occupation than the usual repetitive controllers because it takes advantage of the particular characteristics of the signals to track or attenuate. A sufficient criterion of stability, several hints for its practical application and an example are also included in the work.
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Odd Harmonic digital repetitive control of a single phase current active filter
IEEE Transactions on Power Electronics, 2004Co-Authors: Ramon Costacastello, Robert Grino, Enric FossasAbstract:Shunt active power filters have been proved as useful elements to correct distorted currents caused by nonlinear loads in power distribution systems. This work presents an all-digital approach, based on the repetitive control technique, for their control. In particular, a special digital repetitive plug-in controller for Odd-Harmonic discrete-time periodic references and disturbances is used. This approach does not introduce high gain at those frequencies for which it is not needed, and thus it improves robustness. Additionally, the necessary data memory capacity is lower than in traditional repetitive controllers. The design is performed for the particular case of single-phase shunt active filter with a full-bridge boost topology. Several experimental results are also presented to show the good behavior of the closed-loop system.
Enric Fossas - One of the best experts on this subject based on the ideXlab platform.
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Reply to "concerning "Odd-Harmonic digital repetitive control of a single-phase current active filter""
IEEE Transactions on Power Electronics, 2006Co-Authors: Ramon Costa-castelló, Robert Grino, Enric FossasAbstract:The main objective of this correspondence is to clarify several comments appearing in [1] about our work [2] without the aim of generating any controversy. Furthermore, we would like to recognize the authors of [1] as pioneers in applying the repetitive control technique to the power electronics field [3] [4] Although most of the things discussed in [1] are correct, we would like to clarify the following.
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Odd Harmonic digital repetitive control of a single phase current active filter
IEEE Transactions on Power Electronics, 2004Co-Authors: Ramon Costacastello, Robert Grino, Enric FossasAbstract:Shunt active power filters have been proved as useful elements to correct distorted currents caused by nonlinear loads in power distribution systems. This work presents an all-digital approach, based on the repetitive control technique, for their control. In particular, a special digital repetitive plug-in controller for Odd-Harmonic discrete-time periodic references and disturbances is used. This approach does not introduce high gain at those frequencies for which it is not needed, and thus it improves robustness. Additionally, the necessary data memory capacity is lower than in traditional repetitive controllers. The design is performed for the particular case of single-phase shunt active filter with a full-bridge boost topology. Several experimental results are also presented to show the good behavior of the closed-loop system.
