Week 10
Noise Analysis & Inverter Design (Parallel Work)
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Introduction
Introduction
While doing the signal testing, noise was eminent in the output wave-forms. Therefore, special signal processing techniques were applied to interpret these noises.
The V2 and V3 wave-forms were used to perform the noise analysis
Designed values for LCL filter
10 kHz design
L1=0.7mH, L2=0.7mH, C=5uF
5 kHz design
L1=1.25mH, L2=1.25mH, C=8uF
Cases Studied
Case 1- 10kHz design was executed in 5kHz
Case 2- 10kHz design was executed in 10kHz
Case 3- 5kHz design was executed in 10kHz
Case 4- 5kHz design was executed in 5kHz
Figure: V2 noise PDFs for each cases
Figure: V3 noise PDFs for each cases
Conclusion
Conclusion
Since all the noise PDFs are Gaussian (bell) shape, the Kurtosis value of 3 corresponds to Gaussian noise and when it is more than 3, it is super Gaussian. (The sharp edge of noise PDF reflects the super Gaussian behavior).
Therefore Case 1 and Case 2 noise PDFs are more Gaussian. Hence, it can be concluded that the noise is white noise and there are no external forces on them.
Case 3 and Case 4 noise PDFs are super Gaussian. Therefore, there may be an external force on the system.
Parallel Work
Parallel Work
Due to COVID19 situation the group members were unable to come together due to geographical distance. Therefore, another smart inverter had to be designed. This was undertaken with the collaboration from "Grid Friendly Inverter" group.
This inverter is identical to the initial inverter, but assembled in a home.
Figure: Front and rear of the home assembled inverter
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