9HAFIDZ S A,BASU K P. Ride through capabilities of load during voltage sag/swell and power interruption with zigzag transformer[C]//2008 IEEE Conference on Innovative Technolo- gies in Intelligent Systems and Industrial Application. Cyber- jaya, Malaysia: IEEE, 2008 : 119-122.
10MONTERO-HERNANDEZ O C,ENJETI P N. Ride-through for critical loads[ J ]. IEEE Trans on Industry Applications,2002,8 (6) :45-53.