멀티-레벨 H-Bridge 인버터를 이용한 Line-Interactive DVR

Recently, the interest on power quality has been hot issue. The equipments cause voltage disturbance and has become more sensitive to the voltage disturbance. This paper deals with 5-Level H-Bridge Line-Inter active Dynamic Voltage Restorer(LICVER) system The LIDVER has following advantages in comparison with the DVR with series injection transformer It has the power factor near to unity under normal source voltage, can compensate the harmonic current of the load and the instant, interruption, and has the fast response First, the construction, the operation mode and algebraic modeling of LIDVER are reviewed And then a voltage with constant amplitude To fide PWM method suitable for H-Bridge converter, two PWM methods are compared and analyzed Finally, simulation results verify the proposed 5-level H-Bridge LIDVR system.