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S Corsi - One of the best experts on this subject based on the ideXlab platform.

  • closure of the coordinated automatic voltage Control of the italian transmission grid part i reasons of the choice and overview of the consolidated Hierarchical System
    IEEE Transactions on Power Systems, 2004
    Co-Authors: S Corsi, M Pozzi, C Sabelli, A Serrani
    Abstract:

    Transmission network voltage regulation through coordinated automatic Control of reactive powers is now becoming a challenging objective for many utilities and System operators (ISO or TSO) to achieve significant improvements in the security, quality, and efficiency of power System operation. This survey paper is concerned with application of Secondary and Tertiary Voltage Regulations (SVR and TVR), already operating in the Italian transmission network. The basic concepts behind SVR and TVR and the related Hierarchical Control System are first described in terms of System characteristics, main functions and design requirements. Cost/benefit analysis and comparison with alternative voltage Control solutions are also provided in relation to the influence of power System restructuring process on the voltage ancillary service. More details about Control System apparatuses and their field test results are provided in Part II.

  • the coordinated automatic voltage Control of the italian transmission grid part ii Control apparatuses and field performance of the consolidated Hierarchical System
    IEEE Transactions on Power Systems, 2004
    Co-Authors: S Corsi, M Pozzi, M Sforna, G Dellolio
    Abstract:

    The Hierarchical voltage Control System, currently fully exploited in the Italian transmission grid and presented in Part I, improves voltage quality, network security and operation efficiency. This coordinated automatic System, operated by the Italian ISO (GRTN), is subdivided into three Hierarchical Control levels, requiring unconventional regulation apparatuses. They are the Voltage and Reactive Power Regulator (REPORT) at the power plant level, the Regional Voltage Regulator (RVR) at the regional dispatcher level, and the National Voltage Regulator (NVR) at the ISO Control center. This survey paper provides a general description of the characteristics of these new automatic Control apparatuses and of the interventions required on existing equipment for their installation, activation and operation. A brief presentation of the main dynamic performance of the Hierarchical Control System, from the inner to the outer Control loops, is also given with reference to laboratory, commissioning and field tests.

Richard S. Marken - One of the best experts on this subject based on the ideXlab platform.

  • - METHODS & DESIGNS Spreadsheet analysis of a Hierarchical Control System model of behavior
    1990
    Co-Authors: Richard S. Marken
    Abstract:

    The behavior of a hierarchy of Control Systems can be simulated with an electronic spreadsheet. Each Control System is a column of three cells representing the reference signal, perceptual sig­ nal, and output variable of the System. All of the Control Systems are closed-loop, the input to each System being a function of its output. The circular references in the spreadsheet are resolved through iterative recalculation. When the parameters of each Control System (amplification and slowing factors) are set to appropriate values, all Control Systems in the hierarchy continue to match perceptual signals with reference signals. A three-level hierarchy with four Systems at each level is simulated in the spreadsheet. The spreadsheet model makes it possible to observe the dynamic behavior of the Control Systems as they correct for the effects of environmental dis­ turbance and changes in higher order reference signals. It is possible to "reorganize" the System by changing the perceptions Controlled by Systems at different levels of the hierarchy. The user can also test to determine the variables being Controlled by the System. Powers (1973, 1989) has proposed a Hierarchical con­ trol System model of the purposive behavior of organisms. In this paper, a method of implementing the model on an electronic spreadsheet will be described. The spreadsheet System makes it relatively easy to explore the model's be­ havior with a personal computer. A spreadsheet im­ plementation was selected because many (perhaps most) personal computer users have access to spreadsheet soft­ ware and are familiar with its use. Moreover, the matrix design of the spreadsheet provides an excellent format for representing a Control System hierarchy. The spreadsheet model is designed to be a self-instructional System for those who want to learn how Control Systems work, but it could also be used as a research tool. The behavior of an appropriately designed version of the model could be compared to that of human or animal subjects in experi­ ments like those described by Marken (1986, 1989) and Bourbon (1989).

  • Spreadsheet analysis of a Hierarchical Control System model of behavior
    Behavior Research Methods Instruments & Computers, 1990
    Co-Authors: Richard S. Marken
    Abstract:

    The behavior of a hierarchy of Control Systems can be simulated with an electronic-spreadsheet. Each Control System is a column of three cells representing the reference signal, perceptual signal, and output variable of the System. All of the Control Systems are closed-loop, the input to each System being a function of its output. The circular references in the spreadsheet are resolved through iterative recalculation. When the parameters of each Control System (amplification and slowing factors) are set to appropriate values, all Control Systems in the hierarchy continue to match perceptual signals with reference signals. A three-level hierarchy with four Systems at each level is simulated in the spreadsheet. The spreadsheet model makes it possible to observe the dynamic behavior of the Control Systems as they correct for the effects of environmental disturbance and changes in higher order reference signals. It is possible to “reorganize” the System by changing the perceptions Controlled by Systems at different levels of the hierarchy. The user can also test to determine the variables being Controlled by the System.

Jean W Zu - One of the best experts on this subject based on the ideXlab platform.

  • Hierarchical Control of automotive electric power steering System and anti lock brake System theory and experiment
    International Journal of Vehicle Design, 2012
    Co-Authors: Wuwei Chen, Changbao Chu, Hansong Xiao, Jean W Zu
    Abstract:

    This paper studies integrated Control of chassis Control Systems to achieve the goal of functional integration of the Control Systems. A two-layer Hierarchical Control architecture is developed for integrated Control of Electric Power Steering (EPS) System and Anti-Lock Brake System (ABS). The upper-layer Controller is designed to coordinate the interactions between the EPS System and the ABS. In the lower layer, the two Controllers including the EPS System and the ABS are designed independently to achieve their local Control objectives. Both a simulation investigation and an on-vehicle experimental study are performed to demonstrate the effectiveness of the proposed Hierarchical Control System. Simulation results show that the System is able to improve the lateral stability of the vehicle, and at the same time ensure the steering agility and braking performance of the vehicle. Moreover, on-vehicle experiment results conform to the simulation results.

  • integrated vehicle dynamics Control through coordinating electronic stability program and active suspension System
    International Conference on Mechatronics and Automation, 2009
    Co-Authors: Hansong Xiao, Wuwei Chen, Huihui Zhou, Jean W Zu
    Abstract:

    This paper investigates integrated vehicle dynamics Control through coordinating active suspension System (ASS) and electronic stability program (ESP) in order to improve the overall vehicle performance including handling, stability, and comfort. A two-layer Hierarchical Control architecture is proposed to integrated Control of the two chassis Control Systems. The upper layer Controller is designed to coordinate the interactions between the ASS and the ESP. While in the lower layer, the two Controllers including the ASS and the ESP, are developed independently to achieve their local Control objectives. Simulation investigation is performed to demonstrate the effectiveness of the proposed Hierarchical Control System. Results show that the proposed Hierarchical Control System is able to improve the multiple performance indices of the vehicle including both the ride comfort and the lateral stability, compared to the non-integrated Control System.

  • integrated Control and coordination of vehicle System dynamics
    2009
    Co-Authors: Hansong Xiao, Changbao Chu, Wuwei Chen, Jean W Zu
    Abstract:

    Current and future motor vehicles are incorporating more and more sophisticated chassis Control Systems to improve vehicle handling, stability and comfort. These Control Systems often operate independently and thus interactions and performance conflicts among the Control Systems occur inevitably. To address the problem, this study proposes a two-layer Hierarchical Control architecture for integrated Control of electric power steering (EPS) System and anti-lock brake System (ABS). The upper layer Controller is designed to coordinate the interactions between the EPS System and the ABS. While in the lower layer, the two Controllers including the EPS System and the ABS, are designed independently to achieve their local Control objectives. Simulation results show that the proposed Hierarchical Control System is able to improve the vehicle lateral stability, and at the same time ensure the vehicle steering agility, and the braking performance.Copyright © 2009 by ASME

M Pozzi - One of the best experts on this subject based on the ideXlab platform.

  • closure of the coordinated automatic voltage Control of the italian transmission grid part i reasons of the choice and overview of the consolidated Hierarchical System
    IEEE Transactions on Power Systems, 2004
    Co-Authors: S Corsi, M Pozzi, C Sabelli, A Serrani
    Abstract:

    Transmission network voltage regulation through coordinated automatic Control of reactive powers is now becoming a challenging objective for many utilities and System operators (ISO or TSO) to achieve significant improvements in the security, quality, and efficiency of power System operation. This survey paper is concerned with application of Secondary and Tertiary Voltage Regulations (SVR and TVR), already operating in the Italian transmission network. The basic concepts behind SVR and TVR and the related Hierarchical Control System are first described in terms of System characteristics, main functions and design requirements. Cost/benefit analysis and comparison with alternative voltage Control solutions are also provided in relation to the influence of power System restructuring process on the voltage ancillary service. More details about Control System apparatuses and their field test results are provided in Part II.

  • the coordinated automatic voltage Control of the italian transmission grid part ii Control apparatuses and field performance of the consolidated Hierarchical System
    IEEE Transactions on Power Systems, 2004
    Co-Authors: S Corsi, M Pozzi, M Sforna, G Dellolio
    Abstract:

    The Hierarchical voltage Control System, currently fully exploited in the Italian transmission grid and presented in Part I, improves voltage quality, network security and operation efficiency. This coordinated automatic System, operated by the Italian ISO (GRTN), is subdivided into three Hierarchical Control levels, requiring unconventional regulation apparatuses. They are the Voltage and Reactive Power Regulator (REPORT) at the power plant level, the Regional Voltage Regulator (RVR) at the regional dispatcher level, and the National Voltage Regulator (NVR) at the ISO Control center. This survey paper provides a general description of the characteristics of these new automatic Control apparatuses and of the interventions required on existing equipment for their installation, activation and operation. A brief presentation of the main dynamic performance of the Hierarchical Control System, from the inner to the outer Control loops, is also given with reference to laboratory, commissioning and field tests.

Oleg Sova - One of the best experts on this subject based on the ideXlab platform.