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Wide-area monitoring systems are a requirement in the current power systems in order to provide an appropriate monitoring, supervision and protection from undesired events. Electromechanical oscillations can provoke critical situations and affect the power transmission capability. This paper applies the Multi-Prony Analysis (MPA) to estimate the critical modes by using the tie-lines power measurements...
The large scale penetration of non-synchronous generation based power electronics converters interfaces in current power systems is modifying their dynamic characteristics. The observation, monitoring and supervision of the electromechanical oscillation changes due to this integration is a requirement in order to protect the system from undesired events. This paper uses the Prony analysis to estimate...
This paper improves the existing Kalman-based technique for detecting electromechanical oscillations using Synchrophasor measurements. The novelty is the utilization of a distributed architecture to extract maximum a-posteriori (MAP) estimations of oscillatory parameters. This was achieved by an expectation maximization (EM) algorithm. To improve initial condition estimation, initial correlation information...
The use of Hilbert-Huang Transform (HHT) demonstrated to be effective in detecting time-varying electromechanical oscillations. HHT is a two-step algorithm, consisting of Empirical Mode Decomposition (EMD) and Hilbert Transform. EMD decomposes a signal into a set of Intrinsic Mode Functions, each containing the one oscillatory function. In this paper, the focus is on improving the EMD operation. The...
Phasor Measurement Units (PMUs) is being implemented for on-line oscillation monitoring due to its advantages of enabling faster sampling and accurately measuring phasor information. Many modal analysis algorithms can be implemented due to this. However, bad parameter tuning or sampling at inappropriate intervals, though satisfying Nyquist-Shannon Sampling Criterion, can result into inaccurately estimating...
The adaptive Power System Stabilizer (PSS) tuning method for damping inter-area oscillation is presented in this paper. The primary focus is to adaptively improve the observability of the PSS reflecting the changing operating conditions in order to achieve effective damping towards Inter-Area oscillations. The proposed design approach is considered to be an indirect approach since the PSS parameters...
Detecting unstable inter-area oscillations in electrical power systems is very essential for designing appropriate generator damping strategies. Techniques like Prony analysis and Kalman filter have been proposed to extract oscillation parameters. However, Prony analysis finds it difficult to detect time-varying parameters and the performance of Kalman Filter, which is an adaptive tracking method,...
Load characteristics are known to have an effect on the performance of a Power system stabilizer (PSS) while damping inter-area oscillation. In this paper, conventional and wide area control system (WACS) based PSS designs are comparatively assessed. The conventional PSS utilizes local rotor speed as its input whereas the WACS-based PSS can use both local and remote generator rotor speeds. From existing...
Wide area monitoring system (WAMS) using phasor measurement units (PMU) is being implemented for online oscillation monitoring using Prony analysis. However sampling at inappropriate intervals, though satisfying Nyquist-Shannon criterion, can still cause the Prony analysis to inaccurately estimate damping factors and oscillating frequencies. Hence, this paper investigates possible ways for checking...
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