Documents

146 IJITR-4-5-252

Description
publications
Categories
Published
of 4
All materials on our website are shared by users. If you have any questions about copyright issues, please report us to resolve them. We are always happy to assist you.
Related Documents
Share
Transcript
  S. Chandra Kanth* et al. (IJITR) INTERNATIONAL JOURNAL OF INNOVATIVE TECHNOLOGY AND RESEARCH Volume No.4, Issue No.5, August –  September 2016, 4005  – 4008.   2320  – 5547 @ 2013-2016 http://www.ijitr.com All rights Reserved. Page | 4005 Topological Structure To Realize The Better Utilization Of Solar Energy Modules S.CHANDRA KANTH M.Tech Student, Dept of EEE Indur Institute of Engineering & Technology Siddipet, T.S, India B.SHIVA SURYA PRASAD Associate Professor, Dept of EEE Indur Institute of Engineering & Technology Siddipet, T.S, India Dr. KUSHAL KUMAR Professor, Dept of EEE Indur Institute of Engineering & Technology Siddipet, T.S, India ASHRAD MOHAMMED  Associate Professor, Dept of EEE Indur Institute of Engineering & Technology Siddipet, T.S, India  Abstract: The modular cascaded H-bridge multilevel inverter, which requires a remote electricity source for every H-bridge, is certainly an electricity/ac cascaded inverter topology. The separate electricity links within the multilevel inverter make independent current control possible. To understand better utilization of PV modules while growing the solar power extraction, a distributed maximum power point monitoring control plan's familiar with both single- and three-phase multilevel inverters, which enables independent charge of each electricity-link current. This paper presents a modular cascaded H-bridge multilevel solar (PV) inverter for single- or three-phase grid-connected programs. The modular cascaded multilevel topology enables you to definitely raise the efficiency and versatility of PV systems. For Many-phase grid-connected programs, PV mismatches may introduce unbalanced provided power, resulting in unbalanced grid current. To resolve the PV mismatch issue, a control plan with individual MPPT control and modulation compensation is suggested. To be capable of get rid of the adverse aftereffect in the mismatches while growing the efficiency within the PV system, the PV modules have to operate at different voltages to improve the utilization per PV module. An experimental three-phase seven-level cascaded H-bridge inverter remains built utilizing nine H-bridge modules. Each H-bridge module relates to some 185-W solar power. Simulation and experimental solutions receive to guarantee the functionality within the suggested approach. To resolve this problem, a control plan with modulation compensation can also be suggested.    Keywords:   Distributed Maximum Power Point (MPP) Tracking (MPPT); Modulation Compensation; Photovoltaic (PV); I.   INTRODUCTION While using the outstanding market increase in grid-connected solar (PV) systems, you will find growing interests in grid-connected PV designs. Cascaded inverters contain several converters connected in series thus, the very best power and/or high current inside the mixture of the multiple modules would favor this topology in medium and  big grid-connected PV systems. Because of having less non-renewable fuels and ecological problems introduced on by conventional power generation, renewable energy, particularly solar power, is  becoming extremely popular. Five inverter families may be defined, which be a consequence of different designs within the PV system: 1) central inverters 2) string inverters 3) multistring inverters 4) ac-module inverters and 5) cascaded inverters. Solar-electric-energy demand from clients is ongoing to develop consistently, along with the growth is primarily in grid-connected  programs. There's two kinds of cascaded inverters. A cascaded electricity/electricity ripping tools connection of PV modules. Each PV module offers its very own electricity/electricity ripping tools, along with the modules employing their connected converters remain connected in series to create a high electricity current, that's provided to a simplified electricity/ac inverter [1]. This method combines regions of string inverters and ac-module inverters and provides the benefits of individual module maximum power point monitoring, but it's less pricey and even more efficient than ac-module inverters. However, there are 2 power conversion techniques in this particular configuration. Another cascaded inverter, where each PV panel relates to a distinctive electricity/ac inverter, and individual’s inverters will probably be place in series to achieve a larger-current level. In addition, this electricity/ac cascaded inverter removes the advantages of the  per-string electricity bus along with the central electricity/ac inverter, which further enhances the overall efficiency. The modular cascaded H-bridge multilevel inverter, which requires a remote electricity source for every H-bridge, is certainly an electricity/ac cascaded inverter topology. The separate electricity links within the multilevel inverter make independent current control possible. Consequently, individual MPPT control in every single PV module may be accomplished, along with the energy collected from PV sections may be maximized [2]. Meanwhile, the modularity and  S. Chandra Kanth* et al. (IJITR) INTERNATIONAL JOURNAL OF INNOVATIVE TECHNOLOGY AND RESEARCH Volume No.4, Issue No.5, August –  September 2016, 4005  – 4008.   2320  – 5547 @ 2013-2016 http://www.ijitr.com All rights Reserved. Page | 4006  periodic price of multilevel converters would  position them as being a prime candidate for the next generation of efficient, robust, and reliable grid connected solar energy electronics. A modular cascaded H-bridge multilevel inverter topology for single-or three-phase grid-connected PV systems is  presented during this paper. The panel mismatch issues are addressed to show involve individual MPPT control, along with a control plan with distributed MPPT control will probably be suggested. The distributed MPPT control plan's highly relevant to both single and Three-phase systems. In addition, for the presented three-phase grid-connected PV system, if each PV module is operated in a unique MPP, PV mismatches may introduce unbalanced power deliver to the 3-phase multilevel inverter, resulting in unbalanced injected grid current. To balance the 3-phase grid current, modulation compensation can also be make the control system. A 3-phase modular cascaded multilevel inverter prototype remains built [3]. Each H-bridge relates to some 185-W solar power. The modular design will heighten the versatility within the system minimizing the price too. Simulation and experimental solutions receive to show the developed control plan. Fig.1. Block diagram of modular cascade H-bridge multilevel inverter II.   METHODOLOGY Modular cascaded H-bridge multilevel inverters for single and three-phase grid-connected PV systems. Each phase includes an H-bridge converters connected in series, combined with the electricity link of each and every single H-bridge might be given obtaining a PV panel or simply a brief string of PV sections. The cascaded multilevel inverter is connected to the grid through L filters, that are  broadly-accustomed to lessen the switching harmonics inside our. PV mismatch is a vital trouble within the PV system. Due to the unequal received irradiance, different temps, and aging inside the PV sections, the MPP of each and every single PV module may be different. If each PV module is not controlled individually, the efficiency inside the overall PV system will likely  be decreased. Inside the three-phase grid-connected PV system, a PV mismatch could cause more  problems. Aside from decreasing the overall efficiency, this may even introduce unbalanced  power ship to the three-phase grid-connected system [4]. Should there be PV mismatches  between phases, the input power each phase might  be different. Since the grid current is balanced, this improvement in input power could potentially cause unbalanced current for your grid, which is not allowed by grid standards. To solve the PV mismatch issue, a control plan with individual MPPT control and modulation compensation is recommended. To manage to eliminate the adverse aftereffect within the mismatches while growing the efficiency inside the PV system, the PV modules need to operate at different voltages to enhance the employment per PV module. The separate electricity links inside the cascaded H- bridge multilevel inverter make independent current control possible. To know individual MPPT control in every PV module, the control plan recommended expires-to-date by using this application. In every H-bridge module, an MPPT controller is decided into result in the electricity-link current reference. The distributed MPPT control ask that single-phase strategy is nearly the identical. When using the individual MPPT control in every H-bridge module, the input solar power of each and every single phase might be different, which introduces unbalanced current for your grid [5]. To solve the issue, a zero sequence current might be enforced upon the phase legs to manage to personalize the current flowing into each phase. The whole current controller offers the magnitude inside the active current reference, plus a PLL  provides the frequency and phase position inside the active current reference. The current loop then offers the modulation index. A PV mismatch could cause more difficulties with a 3-phase modular cascaded H-bridge multilevel PV inverter. III.   SIMULATION FILES  S. Chandra Kanth* et al. (IJITR) INTERNATIONAL JOURNAL OF INNOVATIVE TECHNOLOGY AND RESEARCH Volume No.4, Issue No.5, August –  September 2016, 4005  – 4008.   2320  – 5547 @ 2013-2016 http://www.ijitr.com All rights Reserved. Page | 4007 IV.   SIMULTIONRESULTS Voltage, Current, Active & Reactive Power Curves V.   CONCLUSION The modular cascaded H-bridge multilevel inverter, which needs a remote electricity source for each H-bridge, may well be a electricity/ac cascaded inverter topology. The separate electricity links inside the multilevel inverter make independent current control possible. In this  particular paper, a modular cascaded H-bridge multilevel inverter for grid-connected PV programs remains presented. The multilevel inverter topology will encourage you to definitely certainly certainly improve using connected PV modules once the voltages inside the separate electricity links are controlled individually. When using the recommended control plan, each PV module might  be operated within the unique MPP to improve the solar energy extraction, coupled with three-phase grid current is balanced regardless of the unbalanced provided solar power. Thus, a distributed MPPT control request single- and three- phase PV systems remains placed on enhance the overall efficiency of PV systems. For the three- phase grid-connected PV system, PV mismatches may introduce unbalanced provided power, resulting in unbalanced injected grid current. A modulation pay plan, that will not enhance the complexity inside the control system or cause extra  power loss, is made a decision into balance the grid current. A modular three-phase seven-level cascaded H-bridge inverter remains built-within the laboratory and examined with PV sections under different partial shading conditions. VI.   REFERENCES [1] C. D. Townsend, T. J. Summers, and R. E. Betz, “Control and modulation  scheme for a cascaded H-bridge multi-level converter in large scale  photovoltaic systems,” in  Proc.  IEEE ECCE  , Sep. 2012, pp. 3707  –  3714. [2] S. B. Kjaer, “Design and control of an inverter for photovoltaic applications,”    S. Chandra Kanth* et al. (IJITR) INTERNATIONAL JOURNAL OF INNOVATIVE TECHNOLOGY AND RESEARCH Volume No.4, Issue No.5, August –  September 2016, 4005  – 4008.   2320  – 5547 @ 2013-2016 http://www.ijitr.com All rights Reserved. Page | 4008 Ph.D. dissertation, Inst. Energy Technol., Aalborg University, Aalborg East, Denmark, 2004/2005. [3] B. Liu, S. Duan, and T. Cai, “Photovoltaic DC-building-module-based BIPV system  — Concept and design considerations,”  IEEE Trans. Power Electron. , vol. 26, no. 5, pp. 1418  –  1429, May 2011. [4] T. Esram and P. L. Chapman, “Comparison of photovoltaic array maximum power point tracking techniques,”  IEEE Trans. Energy Convers. , vol. 22, no. 2, pp. 439  –  449, Jun. 2007. [5] E. Roman, R. Alonso, P. Ibanez, S. Elorduizapatarietxe, and D. Goitia, “Intelligent PV module for grid -connected PV systems,”  IEEE Trans. Ind. Electron. , vol. 53, no. 4, pp. 1066  –  1073, Jun. 2006.
We Need Your Support
Thank you for visiting our website and your interest in our free products and services. We are nonprofit website to share and download documents. To the running of this website, we need your help to support us.

Thanks to everyone for your continued support.

No, Thanks