Dynamic Voltage Restorer Detection Algorithm And Compen-Sation Strategy Research

With the technological revolution of electrical equipment,the influence of Voltage sag problem is more and more prominent.DVR is the most effective compensation eq-uipment to solve the Voltage sag problem.lt can ensure the sustained stability of sensi-tive load voltage so as to avoid the unnecessary economic losses because of Voltage sag problem.This thesis,with DVR as research subject,makes a research on the calculation and compensation strategy of Voltage sag.First,Comparatively analyzing the three main cir-cuit topology,choosing the converter structured by Three single-phase full bridge to ha-ve a more flexible control as the DVR main circuit of this research subject.Second,w-hen there is a deviation in system frequency and an error in the traditional ??-dq cal-culation,we use the Variable step size difference detection algorithm based on ??-dq.T-his calculation method can ensure that while checking the immediacy,we can also avo-id the checking errors brought by frequency deviation.Third,in view of the problem th-at the traditional minimum energy compensation strategy can not ensure that when it out flows the minimum active power,it can also ensure its longest time,with the opti-mum math calculation according to the relationship between the angle jump and the compensation time,we can get the best according angle jump,as a result,we can ensur-e that the minimum energy compensation can be finished in the longest time in any case.At last,we establish the DVR system simulation model with the help of Simulink simulation software,and make a simulation verification in the case of Single phase fault,two-phase fault,three-phase fault.The simulation verification result show that the DVR system combined by Variable step size difference detection algorithm based on ??-dq and modified minimum energy compensation strategy has a quick response speed,a good tracking effect,a strong anti-interference ability and high compensation precision.It effectively delays the compensation time and reaches to the best result.