Conference Papers
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Item EMD based Detrending of Non-linear and Non-stationary Power System Signals(Institute of Electrical and Electronics Engineers Inc., 2021) Aalam, M.K.; Shubhanga, K.N.In electromechanical modal analysis of power systems using Wide Area Measurement System (WAMS) based setup, signal processing is complex as the signals are non-stationary and non-linear in nature. In order to get accurate modal parameters, as a first step, it is required to remove the non-linear trend of the signal. In the literature, many conventional methods such as filtering, averaging and peak detection techniques are employed for removing trend. In this paper, Empirical Mode Decomposition (EMD) method, an iterative algorithm is presented to detrend a signal. The EMD method and its variant are compared with another popularly used peak detection method referred to as the Zhou's detrending algorithm to find the efficacy of the EMD methods. To test the algorithms, a four machine, two-area power system with three-wind farms is modeled and simulated to generate the power system signals which bring out non-linear and non-stationary nature. Further, the modal characterization is carried out employing Prony analysis. © 2021 IEEE.Item Synchrophasor Measurement Standard Comparison and Testing of an FF-based PMU(Institute of Electrical and Electronics Engineers Inc., 2020) Aalam, M.K.; Shubhanga, K.N.Phasor Measurement Units (PMUs) are an integral part of Wide Area Measurement Systems (WAMS). The PMU algorithms need to be tested before they are utilized for monitoring, control and protection applications. In this context, understanding the test procedures suggested by the IEEE standard for synchrophasor measurement is very essential. This paper looks into the standards, with emphasis on the differences between the 2011 version and the 2014 update. In this paper, the IEEE standard based test procedures are listed and detailed in such a way that they can be readily applied to test any PMU algorithm for compliance verification. The steady-state and dynamic tests given in the standard are performed, using the Fourier Filter (FF) algorithm and results are compared with the permissible limits. Finally the performance of the FF is verified using realistic signals obtained from a 4-machine 10-bus system during fault conditions. © 2020 IEEE.