Abstract
AbstractUnder the background of high wind power permeability, the frequency regulation capability of high voltage direct current (HVDC) sending system tends to deteriorate. For this reason, this paper regards the wind farm (WF) and HVDC as a combined frequency regulation system, and proposes a strategy to cooperate with HVDC and WF to participate in frequency regulation based on fuzzy logic control. First of all, at the system level, in order to realize the dynamic cooperation of the WF and the HVDC to participate in frequency regulation, two fuzzy logic controllers (FLCs) are designed to determine the total power support of the combined system and the coefficient of the WF participating in the frequency regulation according to the frequency deviation of the system and the operation state of the WF, respectively. Secondly, at the WF level, considering the rotating kinetic energy and capacity of wind turbines (WTs), a power allocation strategy is proposed to maximize the utilization of frequency regulation capacity of the multiple WTs in WF. Finally, based on the fast power regulation of HVDC, an active secondary frequency drop (SFD) restrain strategy is proposed to avoid the possible SFD caused by speed recovery of WFs. The simulation results show that the proposed strategy can making full use of the frequency regulation ability of the WF and HVDC, and effectively improve the frequency characteristics of the HVDC sending system.KeywordsHVDCFrequency responseFuzzy logic control
Published Version
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