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Ramaprabha, R.
- Design of Auxiliary Resonant Boost Converter for Flywheel based Photovoltaic Fed Microgrid
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Authors
Affiliations
1 Department of EEE, SSN College of Engineering, Old Mahabalipuram Road, Kalavakkam, Chennai - 603110, Tamil Nadu, IN
2 Department of EEE, Saveetha School of Engineering, Thandalam, Chennai - 602105, Tamil Nadu, IN
1 Department of EEE, SSN College of Engineering, Old Mahabalipuram Road, Kalavakkam, Chennai - 603110, Tamil Nadu, IN
2 Department of EEE, Saveetha School of Engineering, Thandalam, Chennai - 602105, Tamil Nadu, IN
Source
Indian Journal of Science and Technology, Vol 9, No 13 (2016), Pagination:Abstract
Background/Objectives: To have a sustainable and low carbon living, efficient use of renewable energy is necessary hence, a power converter with less switching loss is proposed for the improvement of efficiency of proposed system. Methods/Statistical Analysis: In this work a dc boost converter is considered using an auxiliary resonant circuit for implementation of soft switching technology to reduce switching loss in the converter. The proposed dc resonant boost converter is designed for a required dc output based on the gate duty cycle. The soft switching is made possible by suitably designing the values of the inductor and capacitor of the dc resonant circuit. This circuit is simulated with MATLAB software. Findings: The resonant dc boost converter was simulated using MATLAB software with hard switching, the results of the simulation is discussed with waveforms and numerical values. The soft switched converter was able to provide an improved output voltage of 2Volts, current of 0.4 A, compared to the conventionally designed converter. Suitable design of the resonant components namely the inductor and capacitor, the efficiency of the soft-switched resonant boost converter improved by 2% compared to hard switched converter. Both the hard switching and soft-switched converters were simulated in open loop. It is evident from the output voltage and current waveforms, the settling time taken by the soft-switched converter is more compared to hard switched converter, but the improvement in voltage profile, current profile and efficiency overcomes the drawback of increased settling time. The resonant soft-switched converter when compared with the other converters reported provides an improved performance hence very much suitable for solar photovoltaic application. Applications/Improvements: The performance of the soft-switched converter can be improved further through closed loop control with simple controllers or using fuzzy logic controllers. This converter can also be used for other sources in any distributed generation.Keywords
Auxiliary Resonance, dc-dc Converter, Resonant Converter, Soft Switching, Solar Photovoltaic- Comparative Analysis of Grid Connected Transformerless Photovoltaic Inverters for Leakage Current Minimization
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Authors
Affiliations
1 Department of Electrical and Electronics Engineering, SSN college of Engineering, Kalavakkam, Tamil Nadu – 63110, IN
1 Department of Electrical and Electronics Engineering, SSN college of Engineering, Kalavakkam, Tamil Nadu – 63110, IN
Source
Indian Journal of Science and Technology, Vol 11, No 23 (2018), Pagination: 1-8Abstract
Objectives: To make a comparative analysis of four transformerless topologies namely H5, H6, oH5 and H-Bridge Zero Voltage State Rectifier (HBZVR) in terms of leakage current and THD. Methods/Statistical Analysis: H5, H6, oH5 and HBZVR topologies have been simulated. Then these topologies are compared in terms of leakage current and THD. Based on the comparative analysis, the topology with less leakage current and THD has been chosen for photovoltaic interface. The interfacing circuit is simulated and realized as prototype to validate the results practically. Findings: It is found from the review that HBZVR topology has less leakage current and THD. This topology employs both galvanic isolation and Common Mode Voltage (CMV) clamping. It is found that the common mode voltage in HBZVR is almost eliminated. The conclusion derived from this paper may be helpful in selecting proper topology for PV interface. Application/ Improvements: Generally, in grid connected PV inverters, transformers provide galvanic isolation between the two electrical circuits, thus preventing the flow of leakage current between the stray capacitance of PV and ground. But, ransformers reduce the overall efficiency of the system, which lead to the development of transformerless PV system. Galvanic connection exists between the PV and grid in transformerless inverter, which leads to the presence of leakage current. So, to reduce leakage current, many topologies are introduced which employs either dc-decoupling or ac-decoupling to provide galvanic isolation. The HBZVR topology provides proper isolation for PV interface where the capacitance of the panel with respect to ground is large.References
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