Optimization of AC Filter for Offshore Wind Power Transmission System via 24-Pulse Diode Rectifier

This research proposes an efficient configuration method for the AC filter in an offshore wind farm via a 24-pulse diode rectifier unit. First, the fundamental theory of the 24-pulse diode rectifier unit is explained, along with the construction of the offshore wind power delivery system via this unit. Second, the transmitted active power variation is taken into account while calculating the reactive power needed by the 24-pulse diode rectifier unit. The structure of the AC filter is simplified from the single-tuned or double-tuned filter to a capacitor. Then, the optimization method of the reactive capacity of the AC filter is proposed with the comprehensive consideration of the filtering effect and the filter capacity under full active power variation. Lastly, the offshore wind test system based on a 24-pulse diode rectifier unit is designed with the AC filter optimized, and the harmonic voltage is examined in PSCAD/EMTDC to confirm the efficacy of the suggested AC filter configuration technique.