Voltage equalization control of series-parallel offshore wind farm units
To address the issue of wind curtailment in serially connected wind turbine clusters,a supercapacitor-based energy storage unit is added to the DC side.In the serial cluster,a reference turbine is set,and by controlling the bidirectional DC/DC converter to absorb and release energy,the power output to the DC bus from other turbines in the same cluster,except for the reference unit,is equalized. This achieves consistent wind power and outlet voltage across the DC wind turbines,implementing supercapacitor-based equal voltage control for DC turbines.This approach reduces the difference in wind power output between the turbines in the serial cluster,thereby lowering the rate of wind curtailment. Furthermore,to address issues such as large inductor current ripple and imbalance in two-phase DC/DC converters,a phase-shifting current balancing control strategy is employed.Finally,a simulation model is built in Matlab/Simulink,and our simulation results validate the effectiveness of the proposed strategy.
voltage equalization controlababdoned windphase-shifted current sharing controlnew converter
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