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In this paper, a hybrid particle swarm optimization (HPSO) algorithm to optimize the parameters of DC voltage margin controllers in a voltage source converters multi-terminal direct current (VSC-MTDC) system is proposed. The proposed approach presents a multi-objective function with different time intervals using integral of time-weighted absolute value of the error (ITAE), such that the voltage margin controllers will provide a minimum undershoot, minimum overshoot and fast settling time performance. The performance of the proposed approach is tested on a three-terminal VSC-MTDC system in PSCAD environment through time domain simulations, and comparison to controllers optimized by SIMPLEX algorithm confirmed the favorable performance of the proposed HPSO-tuned controllers. |
