Research on the control strategy of a series-parallel flexible interconnection device based on energy extraction from a multi-winding transformer
Flexible interconnection devices are applied in distribution networks to solve issues like reverse power flow from renewable energy sources and uneven load distribution across supply areas due to their control flexibility and functional diversity.However,current flexible AC interconnection schemes struggle to balance reliability and cost-effectiveness in engineering applications.To address this,firstly the paper proposes a novel topology for a series-parallel flexible interconnection device(SFID)that extracts power using a multi-winding transformer.Secondly,the control theory models of parallel side submodule and series side converter chain of direct series flexible interconnection device are established respectively,and the corresponding DC voltage independent control scheme of shunt side submodule and active power control scheme of series side converter chain are proposed.Finally,the proposed control strategies are validated by full-load operational results from a flexible AC interconnection demonstration project.
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维普
