Model-based tuning approach for multi-band Power System stabilisers PSS4B using an improved modal performance index


Multi-band Power System stabilisers (MB-PSSs) PSS4B (IEEE standard 421.5-2005) are advanced Power System damping controllers that have evident blessings over typical PSSs in damping low-frequency oscillatory modes. But, finding optimal settings for such controllers is challenging due to the increased complexity of the PSS4B structure. This study describes a strategy for MB-PSS parameter optimisation based mostly on an improved modal performance index as a live of the controller's stabilising impact. The tuning problem is formulated as a non-linear constrained optimisation search method: proposed modal performance index is chosen as an objective perform to be minimised, while properly selected constraints guarantee stability of the closed-loop system and robustness of the proposed design. The methodology is demonstrated on a benchmark system that's based on an existing network. Comparative analysis between the MB-PSSs with optimised settings and speed-primarily based PSS1A-sort stabilisers designed using the conventional ways show the practicality and effectiveness of the proposed methodology. The implemented approach has a bonus of being scalable and suitable for the model-based mostly tuning of feedback controller of general structure. Additionally, several performance metrics and non-linear simulations in the ElectroMagnetic Transient Program (EMTP) software make sure superior characteristics of PSS4B.

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