摘要：Conventional topologies operate with a dc link, which makes them bulkier and costlier; it also imposes limits on the compensation capability of the DVR. The dynamic voltage restorer (DVR) is a definitive solution to address the voltage-related PQ problems.This paper presents the voltage sag compensation in multi-bus system with ac chopper based dynamic voltage restorer, Voltage sag remains a serious power-quality (PQ) problem by being the most common and causing more economic losses. Topologies with the same functionality, operating without the dc link by utilizing a direct AC–AC converter, are preferable over the conventional ones. Since no storage device is employed, these topologies require improved information on instantaneous voltages at the point of common coupling and need flexible control schemes depending on these voltages. Therefore, a control scheme for DVR topologies with an AC–AC converter, based on the characterization of voltage sags is proposed to mitigate voltage sags with phase jump. The proposed control scheme is tested on an inter-phase AC–AC converter topology to validate its efficacy by using MATLAB. Index Terms: Voltage sag compensation, Multi-bus system, Power quality, DVR, AC-AC converter
