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Allowable Limit

The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform

Luiz A De S Ribeiro – 1st expert 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: Jose 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.

Jose G De Matos – 2nd expert 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: Jose 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.

  • Power control in AC autonomous and isolated microgrids with renewable energy sources and energy storage systems
    IECON 2013 – 39th Annual Conference of the IEEE Industrial Electronics Society, 2013
    Co-Authors: Jose G De Matos, Luiz Antonio De Souza Ribeiro, Evandro De Carvalho Gomes

    Abstract:

    This paper presents a new strategy to control the generated power that comes from the 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 to the power sources and their respective converters the amount of power they need to generate in order to maintain the battery-bank state of charge below or equal its maximum Allowable Limit. It is proposed a modified droop control to implement this task.

Varun Bajaj – 3rd expert on this subject based on the ideXlab platform

  • A new design approach for nearly linear phase stable IIR filter using fractional derivative
    IEEE CAA Journal of Automatica Sinica, 2020
    Co-Authors: Nikhil Agrawal, Anil Kumar, Varun Bajaj

    Abstract:

    In this paper, a new design method for digital infinite impulse response (IIR) filters with nearly linear-phase response is presented using fractional derivative constraints (FDCs). In the proposed method, design problem of an IIR filter is constructed as the minimization of phase error between the desired and designed phase response of an allpass filter (APF) such that the designed lowpass filter (LPF) or highpass filter (HPF) yields less passband (ep), and stopband errors (es) with optimal stopband attenuation (As). In order to have accurate passband (pb) response, FDCs are imposed on appropriate reference frequency, where the optimality of these FDCs are ensured by using a new greedy based sorting mechanism. The simulated results reflect the efficiency of the proposed method in term of improved passband response along with better transition width. However, small reduction in As is observed within the Allowable Limit, when compared to non-fractional design approach, but the designed filter remains immune to wordlength (WL) effect.

  • A New Design Method for Stable IIR Filters With Nearly Linear-Phase Response Based on Fractional Derivative and Swarm Intelligence
    IEEE Transactions on Emerging Topics in Computational Intelligence, 2017
    Co-Authors: Nikhil Agrawal, Anil Kumar, Varun Bajaj

    Abstract:

    In this paper, a new design method based on fractional derivative (FD) is proposed for designing digital stable infinite impulse response (IIR) filters with nearly linear-phase response. In this method, the design problem is formulated as a phase error optimization of an all-pass filter connected in parallel with a pure delay function. FD is employed to improve the frequency response of the filter at some reference point (ω0) in the passband. Optimal values of FD constraints and reference points in passband are determined by minimizing the sum of error in passband (Ep) and stopband (Es) of an IIR filter, using different evolutionary techniques such as particle swarm optimization (PSO), constraint factor inertia PSO (CFI-PSO), quantum PSO, artificial bee colony algorithm, and cuckoo search technique. Comparative study provides evidence that the proposed method, based on CFI-PSO, gives the best performance amongst the employed swarm-based techniques. Experimental results show the impact of the proposed method as compared to earlier reported techniques in terms of improved response in passband and sharper transition width. However, small reduction in stopband attenuation (As) is observed within the Allowable Limit when compared to nonfractional design approaches.