An Enhanced Voltage Sag Compensation Scheme for Dynamic Voltage Restorer

ABSTRACT:  

This paper manages enhancing the voltage nature of touchy burdens from voltage droops utilizing dynamic voltage restorer (DVR). The higher dynamic power necessity related with voltage stage hop remuneration has caused a generous ascent in size and cost of dc connect vitality stockpiling arrangement of DVR. The current control procedures either moderate the stage bounce or enhance the usage of dc interface vitality by (I) diminishing the abundancy of infused voltage, or (ii) advancing the dc transport vitality bolster. In this paper, an upgraded list pay procedure is suggested that mitigates the stage bounce in the heap voltage while enhancing the general droop remuneration time. A scientific examination demonstrates that the proposed strategy essentially builds the DVR list bolster time (over half) contrasted and the current stage bounce pay strategies. This upgrade can likewise be viewed as a significant decrease in dc interface capacitor measure for new establishment. The execution of proposed technique is assessed utilizing recreation contemplate lastly, confirmed tentatively on a scaled lab model.

 

CIRCUIT DIAGRAM:

 

 Fig. 1 Basic DVR based system configuration.

 EXPECTED SIMULATION RESULTS:

 

Fig. 2. Simulation results for the proposed sag compensation method for 50% sag depth. (a) PCC voltage, (b) load voltage, (c) DVR voltage, (d) DVR active and reactive power, and (e) dc link voltage.

Fig. 3. Simulation results for the proposed sag compensation method for 23% sag depth. (a) PCC voltage, (b) load voltage, (c) DVR voltage, (d) DVR active and reactive power, and (e) dc link voltage.

 CONCLUSION:

In this paper an upgraded hang remuneration conspire is proposed for capacitor bolstered DVR. The proposed procedure enhances the voltage nature of touchy loads by ensuring them against the lattice voltage droops including the stage bounce. It likewise builds remuneration time by working in least dynamic power mode through a controlled change once the stage bounce is redressed. To show the viability of the proposed technique a scientific correlation is completed with the current stage bounce pay plans. It is demonstrated that pay time can be reached out from 10 to 25 cycles (considering presag infusion as the reference strategy) for the planned furthest reaches of half droop profundity with 450 stage bounce. Further expansion in remuneration time can be accomplished for middle of the road droop profundities. This all-inclusive pay time can be viewed as extensive decrease in dc connect capacitor estimate (for the examined case over half) for the new establishment. The viability of the proposed strategy is assessed through broad recreations in MATLAB/Simulink and approved on a scaled lab model tentatively. The trial results exhibit the plausibility of the proposed stage hop remuneration strategy for viable applications.