Dual-loop current control strategy of high-voltage active power filters for deep and distant offshore wind power
The harmonic pollution issue that may arise during the interaction between deep and distant offshore wind power transmission systems and onshore power grids can affect the safe operation of the systems.High-voltage active power filters(HAPF)represent an efficient means of harmonic mitigation.To achieve stable control of the HHAPF,this paper proposes a dual-loop current control strategy that simultaneously detects both grid current and inverter-side current.Without the need for additional current sensors,the introduction of a first-order high-pass feedback on the inverter-side current achieves resonance peak suppression for the equivalent LCL filter and addresses the issue of LCL low-frequency gain attenuation caused by proportional feedback.Meanwhile,to effectively suppress the injection of harmonic currents from the wind farm into the grid,the current controller adopts a proportional resonant controller,and a controller parameter design method combining root locus and Bode plot is presented.Finally,the proposed dual-loop current control strategy is experimentally validated on a 30kVA scaled-down prototype.The experimental results demonstrate the effectiveness of the aforementioned method.
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