Simulation Analysis of DVR Performance for Voltage Sag Mitigation

ABSTRACT:

Voltage sag is truly one of intensity quality issue and it end up extreme to mechanical clients. Voltage hang can cause miss task to a few touchy electronic types of gear. That issue can be moderating with voltage infusion strategy utilizing custom power gadget, Dynamic Voltage Restorer (DVR). This paper presents displaying and investigation of a DVR with heartbeat width tweak (PWM) based controller utilizing Matlab/Simulink. The execution of the DVR relies upon the effectiveness of the control strategy associated with exchanging the inverter. This paper proposed two control procedures which is PI Controller (PI) and Fuzzy Logic Controller (FL). Complete outcomes are introduced to evaluate the execution of every controller as the best power quality arrangement. Different components that likewise can influence the execution and ability of DVR are displayed also.

 

 BLOCK DIAGRAM:

 Figure1. DVR Modelling using Matlab/Simulink

 EXPECTED SIMULATION RESULTS:

Figure 2. (a) Injection voltage from DVR controlled by PI ; (b) injection voltage controlled by FL

Figure 3. (a) Output voltage at load 1 after injection voltage from DVR controlled by PI; (b) Output voltage at load 1after injection voltage controlled by FL.

Figure 4. (a) Injection voltage from DVR controlled by PI; (b) injection voltage controlled by FL.

Figure 5. (a) Output voltage at load 1 after injection voltage from DVR controlled by PI; (b) Output voltage at load 1after injection voltage controlled by FL.

Figure 6. THD generated when PI controller is applied

Figure 7. THD generated when FL controller is applied.

CONCLUSION:

In this examination, the displaying and reenactment of DVR controlled by PI and FL Controller has been produced utilizing Matlab/Simulink. For both controller, the reenactment result demonstrates that the DVR repays the hang rapidly (70μs) and gives great voltage direction. DVR handles numerous types, adjusted and unequal blame with no troubles and infuses the proper voltage segment to address any blame circumstance happened in the supply voltage to keep the heap voltage adjusted and steady at the ostensible esteem. The two controllers demonstrate an incredible execution and create low THD (<5%). Notwithstanding, it very well may be seen that FL Controller gives better execution with THD produced with just 0.64% while PI created 1.68% THD. In any case, other a few factors that can influence the execution of DVR should be tended to for improvement of the yield voltage. These variables are the vitality stockpiling limit and transformer rating. From the recreation, it unmistakably demonstrates the significance of these two factors and how they influence the execution of DVR. Hence, with regards to usage, it is urgent to think about these elements, so the execution of DVR is enhanced.

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