Solar Inverter Case Study

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Reliability Prediction of New Improved Current Source Inverter (CSI) Topology for Transformer-Less Grid Connected Solar System
Kalyani C. Potdukhe
Department of Electrical Engineering
Yeshwantrao Chavan College of Engineering. Nagpur, India. kalyani.potdukhe@gmail.com Mr. A. P. Munshi
Department of Electrical Engineering Yeshwantrao Chavan College of Engineering. Nagpur, India. aniketmunshi@gmail.com Mrs. A. A. Munshi
Department of Electrical Engineering
Rajiv Gandhi College of Engineering. Nagpur, India. aam.nyss@gmail.com

Abstract— Solar inverters are mainly classified as voltage source based solar inverter and current source based solar inverter. The comparison of voltage source inverter (VSI) and current source inverter
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Time for CSI. The reliability of CSI is calculated in Ground Benign Environment. Figure 7. Reliability curve of CSI.
The reliability of CSI is found to be 96.48%. The overall failure rate of CSI is found to be 4.0937e-006 hours/failure and its MTBF is found to be 0.24432e+006 Hours. It can also be seen from the curves of VSI and CSI that in case of CSI, the reliability reduces exponentially but doesn’t go to zero in 100 years unlike VSI.
C. Reliability Analysis of Proposed CSI
Fig.8 below shows the reliability block diagram of new improved proposed CSI topology represented by circuit in Fig. 3. All the components of CSI in Fig. 8, are assumed to be connected in series from reliability point of view.

Figure 8. Reliability Block Diagram of Proposed CSI
Table 7 shows the failure rate models of components of proposed CSI and base failure rates are given in table 8
TABLE 7. FAILURE RATE MODEL OF COMPONENTS IN PROPOSED CSI
Components Failure Rate Model
Inductor (L) λL= λLb πC πQ

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