Stability Analysis Suite (STASU) for DC and Three-Phase AC Electrical Power Systems
A comprehensive analysis toolset is developed for addressing the system stability at alternating-current (AC) and direct-current (DC) electrical interfaces from test and simulation results of small-signal dq and DC impedances. The software tool also includes Graphical User Interfaces (GUI) to facilitate fast and flexible data visualization and analyses. From the dq impedance data (either measured or simulated), AC stability is assessed using the Generalized Nyquist Criteria (GNC) or a simpler formulation of GNC. Similarly, from the DC impedance data, stability is assessed using the Nyquist criteria applied to Single-Input-Single-Output (SISO) system. The algorithm for the impedance extraction by simulation is based on Fast Fourier Transformation (FFT), whose window is determined by a Phase-Looked Loop (PLL) synchronized with the line frequency to minimize errors caused by unbalanced and harmonic components. Furthermore, two types of injection signal waveforms can be used for impedance identification; the pure sinusoidal signal (single-tone signal) and the multi-tone signal, which is the superposition of multiple frequency components of sinusoidal signals. The multi-tone approach significantly reduces the computational time needed for impedance identification. STAISU is a comprehensive, user-friendly software toolset for assessing system stability using DC or dq impedance data obtained by either measurements from hardware testing or calculations from simulation models.
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