Abstract
Dynamic voltage restorer (DVR), which is installed between the supply and a critical load, can restore the load voltage to the pre-fault voltage during voltage sag. To restore load voltage, DVR should inject the equivalent of dropped voltage, which represents the voltage difference between pre-fault and fault voltage through series connected transformer. Voltage restoration of DVR needs to inject active power and energy from DVR to distribution system. However, the capability of energy storage that usually consists of capacitors in DVR is limited. Therefore, it must be considered how the injection energy can be minimized and the load voltage can be made close to the pre-fault voltage. This paper describes conventional restoration techniques like pre-sag compensation, in-phase compensation, and phase advance method. In addition, this paper proposes a new concept of restoration technique to inject minimum energy during DVR compensation. The proposed method is based on the definition of voltage tolerance of the load. In the proposed method, some particular disturbances can be corrected with less amount of energy discharge than those of conventional methods.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: International Journal of Electrical Power and Energy Systems
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
