Transient voltage compensation by a power electronics-based device

Dynamic Voltage Restorers (DVR) provide an advanced and economical solution for voltage sag/swell events. Such devices are used to protect sensitive loads on distribution electrical systems, placing it in series with sensitive loads. This paper presents a single-phase DVR performance under such events, able to compensate sags/swells in two cycles. A peak detector and the in-phase compensation method are used to get quick and accurate responses. The digital control system is implemented on the CompactRIO embedded system, and is programmed in LabVIEW software. The effectiveness of the proposed DVR system is verified and validated through simulations and experimental tests.