Obtaining Frequency Responses of User-Defined Models in the ATP
Keywords:
ATP Models, Frequency-Dependent Network Equivalent (FDNE), Frequency response, Numerical Fourier transform, Symmetrical components of non-sinusoidal inputsAbstract
User-Defined Models (UDMs) in the Alternative Transients Program (ATP) are valuable tools. However, its creation using the ATP MODELS language is not simple. One type of UDM of particular importance is the high-fidelity Frequency-Dependent Network Equivalent (FDNE), assembled, in general, by fitting the Frequency Responses (FRs) of the self-and transfer admittances seen from the boundary buses of the external area (part of the system to be substituted by the FDNE). The correctness of the FDNE implementation can be verified by comparing its FRs with those of the external area. Unfortunately, obtaining the FRs of a UDM is not a simple task as in the case of the ATP built-in components. Thus, this work proposes a method for calculating the FRs of the UDMs implemented with the MODELS in the ATP. The proposal is based on the UDM time responses to the unit impulse in symmetric components and the Fourier transform.
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