Design of Dynamic Voltage Restorer

Abstract

This article studies the dynamic voltage restorer DVR (Dynamic Voltage Restorer). It is a design and research aimed at the insufficient voltage stability of modern power grids, mainly used to solve the problem of voltage sag. In this paper, the working principle of DVR is studied, the whole control scheme is proposed, and the circuit design is carried out. The common compensation strategies are summarized and compared. The main circuit of DVR is analyzed in detail, and the structure of the module is determined separately. The parameters and model selection of some modules are calculated and determined. Then the detection and algorithm of DVR are also elaborated, and the analysis is started from dq transformation. The control link does not use PID to control, but uses voltage hysteresis control, which has the characteristics of real-time control, fast response speed and strong robustness.