In the controllable rectifier circuit, the conditions for realizing active inverter ()

A、TheloadhasDCelectromotiveforce,itspolaritymustbeconsistentwiththeconductiondirectionofthethyristor,anditsvalueshouldbegreaterthantheaveragevoltageontheDCsideoftheconverter;thecontrolangleofthethyristorisrequiredtobea>p/2;
B、TheloadhasaDCelectromotiveforce,itspolaritymustbeconsistentwiththeconductiondirectionofthethyristor,anditsvalueshouldbeequaltotheaveragevoltageontheDCsideoftheconverter.Requirescontrolangleofthyristora>p/2;
C、TheloadhasDCelectromotiveforce,itspolaritymustbeoppositetotheconductiondirectionofthethyristor,anditsvalueshouldbeequaltotheaveragevoltageontheDCsideoftheconverter;thecontrolangleofthethyristorisrequiredtobea

D、TheloadhasaDCelectromotiveforce,itspolaritymustbeoppositetotheconductiondirectionofthethyristor,anditsvalueshouldbegreaterthantheaveragevoltageontheDCsideoftheconverter;thecontrolangleofthethyristorisrequiredtobea