A novel method for voltage sag / swell compensation using Dynamic Voltage Restorer

This paper presents the design of Load side compensation topology of Dynamic Voltage Restorer using Z-source Inverter which is able to compensate voltage sag and swell at sensitive load terminals. Based on this topology, the DVR consists of uncontrolled rectifier for giving DC supply to Z-Source converter through DC link. Z- Source Converter based topology is proposed in order to enhance the voltage restoration property of the device. By controlling the shoot through capability of ZSC system using IGBTs provide ride-through capability during voltage sag, swell and provides high reliability. Additionally, a control scheme called Hysteresis Voltage loop controller is proposed to synthesis the desired injecting voltage. The simulation results are presented to demonstrate the effectiveness of the proposed DVR system, which exhibits the compensation for voltage sag and swell.

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