The Experts below are selected from a list of 14877 Experts worldwide ranked by ideXlab platform

Dipti Srinivasan - One of the best experts on this subject based on the ideXlab platform.

  • nonlinear function controller a simple alternative to fuzzy logic controller for a Power Electronic Converter
    IEEE Transactions on Industrial Electronics, 2005
    Co-Authors: K Viswanathan, R Oruganti, Dipti Srinivasan
    Abstract:

    Recently, there has been an increase in the application of fuzzy logic controllers (FLCs) for control of Power Electronic Converters. Due to the FLCs' complex algorithm, their realization often calls for a compromise between cost and performance. In this paper, it is shown that the rule table of most of the two-input FLCs used with Power Converters can be approximated into a single nonlinearity. This allows the controller to be easily realized using simple, fast, and inexpensive analog circuits. The simplified "nonlinear function controller (NLFC)" developed in this manner is shown to be equivalent in performance to the original FLC through simulations. The NLFC concept is then applied to PI-FLC, a type of FLC popular in Power Converter control applications. This results in the PI-FLC being replaced by a simple "nonlinear PI controller (NPIC)". Using this simplification, the design of NPICs to obtain good dynamic performance in Power Converters is explained. An example design of NPIC for controlling a dc-dc boost Power Converter is presented. Experimental results are also presented to demonstrate the superior dynamic performance of the Converter with NPIC versus that of a linear-PI controller.

  • a universal fuzzy controller for a non linear Power Electronic Converter
    IEEE International Conference on Fuzzy Systems, 2002
    Co-Authors: K Viswanathan, Dipti Srinivasan, R Oruganti
    Abstract:

    Presents the development of a universal fuzzy controller for a non-linear Power Electronic Converter. The classical boost Converter used in Power supplies is a minimal phase system with a right-half-plane zero. This right-half-plane zero forces the designer to go for controllers that give slow dynamics. The conventional linear PI controllers for such Converters, designed under the worst case conditions of maximum load and minimum line conditions, present a lower loop bandwidth even if the operating conditions are better. Moreover, the system response is sluggish. Modern fuzzy controllers, on the other hand, can be designed to adapt to varying operating conditions for application in such nonlinear systems. The paper designs a universal fuzzy controller and compares its performance at various operating points with local PI controllers designed for the particular operating points. The settling time and overshoot for startup and step response obtained by computer simulations have been compared. The superior performance of the fuzzy controller, in particular, its ability to achieve good transient response under different operating conditions is clearly established.

R Oruganti - One of the best experts on this subject based on the ideXlab platform.

  • simple analytical models to predict conducted emi noise in a Power Electronic Converter
    Conference of the Industrial Electronics Society, 2007
    Co-Authors: Krishna Mainali, R Oruganti
    Abstract:

    Knowing the characteristics of the sources and paths involved in the injection of conducted electromagnetic interference (EMI) currents into the input source from a Power Converter allows one to analyze and improve a Converter's electromagnetic compatibility (EMC) performance. In this paper, analytical models to predict the conducted EMI noise generated by a boost Power factor correction (PFC) Converter are presented. These simple models are based on the noise generation mechanism and the path through which the noise travel. The models require the measurement of high frequency characteristics of the components involved in the noise path. By comparing the predicted noise spectra with the experimentally measured noise spectra, it is verified that the proposed analytical models can be used to reasonably predict the noise generated by the PFC. The proposed models can thus be used to carry out a preliminary design of the EMI filters needed and hence their size and cost even before building and testing the Power Converter.

  • nonlinear function controller a simple alternative to fuzzy logic controller for a Power Electronic Converter
    IEEE Transactions on Industrial Electronics, 2005
    Co-Authors: K Viswanathan, R Oruganti, Dipti Srinivasan
    Abstract:

    Recently, there has been an increase in the application of fuzzy logic controllers (FLCs) for control of Power Electronic Converters. Due to the FLCs' complex algorithm, their realization often calls for a compromise between cost and performance. In this paper, it is shown that the rule table of most of the two-input FLCs used with Power Converters can be approximated into a single nonlinearity. This allows the controller to be easily realized using simple, fast, and inexpensive analog circuits. The simplified "nonlinear function controller (NLFC)" developed in this manner is shown to be equivalent in performance to the original FLC through simulations. The NLFC concept is then applied to PI-FLC, a type of FLC popular in Power Converter control applications. This results in the PI-FLC being replaced by a simple "nonlinear PI controller (NPIC)". Using this simplification, the design of NPICs to obtain good dynamic performance in Power Converters is explained. An example design of NPIC for controlling a dc-dc boost Power Converter is presented. Experimental results are also presented to demonstrate the superior dynamic performance of the Converter with NPIC versus that of a linear-PI controller.

  • a universal fuzzy controller for a non linear Power Electronic Converter
    IEEE International Conference on Fuzzy Systems, 2002
    Co-Authors: K Viswanathan, Dipti Srinivasan, R Oruganti
    Abstract:

    Presents the development of a universal fuzzy controller for a non-linear Power Electronic Converter. The classical boost Converter used in Power supplies is a minimal phase system with a right-half-plane zero. This right-half-plane zero forces the designer to go for controllers that give slow dynamics. The conventional linear PI controllers for such Converters, designed under the worst case conditions of maximum load and minimum line conditions, present a lower loop bandwidth even if the operating conditions are better. Moreover, the system response is sluggish. Modern fuzzy controllers, on the other hand, can be designed to adapt to varying operating conditions for application in such nonlinear systems. The paper designs a universal fuzzy controller and compares its performance at various operating points with local PI controllers designed for the particular operating points. The settling time and overshoot for startup and step response obtained by computer simulations have been compared. The superior performance of the fuzzy controller, in particular, its ability to achieve good transient response under different operating conditions is clearly established.

Luiz A De S Ribeiro - One of the best experts on this subject based on the ideXlab platform.

  • Power control in ac isolated microgrids with renewable energy sources and energy storage systems
    IEEE Transactions on Industrial Electronics, 2015
    Co-Authors: José G. De Matos, Felipe S F E Silva, Luiz A De S Ribeiro
    Abstract:

    This paper presents a new strategy to control the generated Power from energy sources existing in autonomous and isolated microgrids. In this particular study, the Power system consists of a Power Electronic Converter supplied by a battery bank, which is used to form the ac grid (grid former Converter), an energy source based on a wind turbine with its respective Power Electronic Converter (grid supplier Converter), and the Power consumers (loads). The main objective of this proposed strategy is to control the state of charge of the battery bank limiting the voltage on its terminals by controlling the Power generated by the energy sources. This is done without using dump loads or any physical communication among the Power Electronic Converters or the individual energy source controllers. The electrical frequency of the microgrid is used to inform the Power sources and their respective Converters about the amount of Power that they need to generate in order to maintain the battery-bank charging voltage below or equal its maximum allowable limit. Experimental results are presented to show the feasibility of the proposed control strategy.

K Viswanathan - One of the best experts on this subject based on the ideXlab platform.

  • nonlinear function controller a simple alternative to fuzzy logic controller for a Power Electronic Converter
    IEEE Transactions on Industrial Electronics, 2005
    Co-Authors: K Viswanathan, R Oruganti, Dipti Srinivasan
    Abstract:

    Recently, there has been an increase in the application of fuzzy logic controllers (FLCs) for control of Power Electronic Converters. Due to the FLCs' complex algorithm, their realization often calls for a compromise between cost and performance. In this paper, it is shown that the rule table of most of the two-input FLCs used with Power Converters can be approximated into a single nonlinearity. This allows the controller to be easily realized using simple, fast, and inexpensive analog circuits. The simplified "nonlinear function controller (NLFC)" developed in this manner is shown to be equivalent in performance to the original FLC through simulations. The NLFC concept is then applied to PI-FLC, a type of FLC popular in Power Converter control applications. This results in the PI-FLC being replaced by a simple "nonlinear PI controller (NPIC)". Using this simplification, the design of NPICs to obtain good dynamic performance in Power Converters is explained. An example design of NPIC for controlling a dc-dc boost Power Converter is presented. Experimental results are also presented to demonstrate the superior dynamic performance of the Converter with NPIC versus that of a linear-PI controller.

  • a universal fuzzy controller for a non linear Power Electronic Converter
    IEEE International Conference on Fuzzy Systems, 2002
    Co-Authors: K Viswanathan, Dipti Srinivasan, R Oruganti
    Abstract:

    Presents the development of a universal fuzzy controller for a non-linear Power Electronic Converter. The classical boost Converter used in Power supplies is a minimal phase system with a right-half-plane zero. This right-half-plane zero forces the designer to go for controllers that give slow dynamics. The conventional linear PI controllers for such Converters, designed under the worst case conditions of maximum load and minimum line conditions, present a lower loop bandwidth even if the operating conditions are better. Moreover, the system response is sluggish. Modern fuzzy controllers, on the other hand, can be designed to adapt to varying operating conditions for application in such nonlinear systems. The paper designs a universal fuzzy controller and compares its performance at various operating points with local PI controllers designed for the particular operating points. The settling time and overshoot for startup and step response obtained by computer simulations have been compared. The superior performance of the fuzzy controller, in particular, its ability to achieve good transient response under different operating conditions is clearly established.

José G. De Matos - One of the best experts on this subject based on the ideXlab platform.

  • Power control in ac isolated microgrids with renewable energy sources and energy storage systems
    IEEE Transactions on Industrial Electronics, 2015
    Co-Authors: José G. De Matos, Felipe S F E Silva, Luiz A De S Ribeiro
    Abstract:

    This paper presents a new strategy to control the generated Power from energy sources existing in autonomous and isolated microgrids. In this particular study, the Power system consists of a Power Electronic Converter supplied by a battery bank, which is used to form the ac grid (grid former Converter), an energy source based on a wind turbine with its respective Power Electronic Converter (grid supplier Converter), and the Power consumers (loads). The main objective of this proposed strategy is to control the state of charge of the battery bank limiting the voltage on its terminals by controlling the Power generated by the energy sources. This is done without using dump loads or any physical communication among the Power Electronic Converters or the individual energy source controllers. The electrical frequency of the microgrid is used to inform the Power sources and their respective Converters about the amount of Power that they need to generate in order to maintain the battery-bank charging voltage below or equal its maximum allowable limit. Experimental results are presented to show the feasibility of the proposed control strategy.