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A review on planning, configurations, modeling and optimization techniques of hybrid renewable energy systems for off grid applications

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  • Siddaiah, Rajanna
  • Saini, R.P.

Abstract

Hybrid renewable energy (HRE) system based power generation is a cost effective alternative where power grid extensions are expensive. This system utilizes two or more locally available renewable energy resources such as wind, solar, biomass, biogas and small hydro power with or without conventional fossil fuel energy sources to create standalone mode to meet the energy needs in rural remote areas. This study offers a comprehensive review of the research work carried out in planning, configurations, and modeling and optimization techniques of hybrid renewable energy systems for off grid applications. Hybrid renewable system utilities today are more dependent on an optimal design to minimize the cost function. This paper presents a review of various mathematical models proposed by different researchers. These models have been developed based on objective functions, economics and reliability studies involving design parameters. The present study will familiarize the reader with various optimization techniques of system modeling and enable them to compare these models on the basis of their cost functions. Researchers may consider the most suitable model from the various hybrid renewable system models proposed in this study to develop customized designs for optimizing system size while incurring least cost.

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  • Siddaiah, Rajanna & Saini, R.P., 2016. "A review on planning, configurations, modeling and optimization techniques of hybrid renewable energy systems for off grid applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 58(C), pages 376-396.
    • Handle: RePEc:eee:rensus:v:58:y:2016:i:c:p:376-396
    DOI: 10.1016/j.rser.2015.12.281
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    1. Joshi, Bharati & Bhatti, T.S. & Bansal, N.K., 1992. "Decentralized energy planning model for a typical village in India," Energy, Elsevier, vol. 17(9), pages 869-876.
    2. Nema, Pragya & Nema, R.K. & Rangnekar, Saroj, 2010. "Minimization of green house gases emission by using hybrid energy system for telephony base station site application," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(6), pages 1635-1639, August.
    3. Yang, Hongxing & Wei, Zhou & Chengzhi, Lou, 2009. "Optimal design and techno-economic analysis of a hybrid solar-wind power generation system," Applied Energy, Elsevier, vol. 86(2), pages 163-169, February.
    4. Bernal-Agustín, José L. & Dufo-López, Rodolfo, 2009. "Simulation and optimization of stand-alone hybrid renewable energy systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 13(8), pages 2111-2118, October.
    5. Neves, Diana & Silva, Carlos A. & Connors, Stephen, 2014. "Design and implementation of hybrid renewable energy systems on micro-communities: A review on case studies," Renewable and Sustainable Energy Reviews, Elsevier, vol. 31(C), pages 935-946.
    6. Deshmukh, S.S. & Deshmukh, M.K., 2009. "A new approach to micro-level energy planning--A case of northern parts of Rajasthan, India," Renewable and Sustainable Energy Reviews, Elsevier, vol. 13(3), pages 634-642, April.
    7. Zhou, Wei & Lou, Chengzhi & Li, Zhongshi & Lu, Lin & Yang, Hongxing, 2010. "Current status of research on optimum sizing of stand-alone hybrid solar-wind power generation systems," Applied Energy, Elsevier, vol. 87(2), pages 380-389, February.
    8. Lujano-Rojas, Juan M. & Dufo-López, Rodolfo & Bernal-Agustín, José L., 2013. "Probabilistic modelling and analysis of stand-alone hybrid power systems," Energy, Elsevier, vol. 63(C), pages 19-27.
    9. Fang, Zhen, 1993. "A model of the energy-supply and demand system at the village level," Energy, Elsevier, vol. 18(4), pages 365-369.
    10. Al-Ashwal, A.M. & Moghram, I.S., 1997. "Proportion assessment of combined PV-wind generating systems," Renewable Energy, Elsevier, vol. 10(1), pages 43-51.
    11. Kaabeche, A. & Belhamel, M. & Ibtiouen, R., 2011. "Sizing optimization of grid-independent hybrid photovoltaic/wind power generation system," Energy, Elsevier, vol. 36(2), pages 1214-1222.
    12. Erdinc, O. & Uzunoglu, M., 2012. "Optimum design of hybrid renewable energy systems: Overview of different approaches," Renewable and Sustainable Energy Reviews, Elsevier, vol. 16(3), pages 1412-1425.
    13. Devadas, V., 2001. "Planning for rural energy system: part I," Renewable and Sustainable Energy Reviews, Elsevier, vol. 5(3), pages 203-226, September.
    14. Yap, Wai Kean & Karri, Vishy, 2015. "An off-grid hybrid PV/diesel model as a planning and design tool, incorporating dynamic and ANN modelling techniques," Renewable Energy, Elsevier, vol. 78(C), pages 42-50.
    15. Viral, Rajkumar & Khatod, D.K., 2012. "Optimal planning of distributed generation systems in distribution system: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 16(7), pages 5146-5165.
    16. Iniyan, S & Sumathy, K, 2000. "An optimal renewable energy model for various end-uses," Energy, Elsevier, vol. 25(6), pages 563-575.
    17. Iniyan, S & Suganthi, L & Jagadeesan, T.R & Samuel, Anand A, 2000. "Reliability based socio economic optimal renewable energy model for India," Renewable Energy, Elsevier, vol. 19(1), pages 291-297.
    18. Kanase-Patil, A.B. & Saini, R.P. & Sharma, M.P., 2010. "Integrated renewable energy systems for off grid rural electrification of remote area," Renewable Energy, Elsevier, vol. 35(6), pages 1342-1349.
    19. Iqbal, M. & Azam, M. & Naeem, M. & Khwaja, A.S. & Anpalagan, A., 2014. "Optimization classification, algorithms and tools for renewable energy: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 39(C), pages 640-654.
    20. Arul, P.G. & Ramachandaramurthy, Vigna K. & Rajkumar, R.K., 2015. "Control strategies for a hybrid renewable energy system: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 42(C), pages 597-608.
    21. Diaf, S. & Notton, G. & Belhamel, M. & Haddadi, M. & Louche, A., 2008. "Design and techno-economical optimization for hybrid PV/wind system under various meteorological conditions," Applied Energy, Elsevier, vol. 85(10), pages 968-987, October.
    22. Devadas, V., 2001. "Planning for rural energy system: part II," Renewable and Sustainable Energy Reviews, Elsevier, vol. 5(3), pages 227-270, September.
    23. Diaf, S. & Belhamel, M. & Haddadi, M. & Louche, A., 2008. "Technical and economic assessment of hybrid photovoltaic/wind system with battery storage in Corsica island," Energy Policy, Elsevier, vol. 36(2), pages 743-754, February.
    24. Akikur, R.K. & Saidur, R. & Ping, H.W. & Ullah, K.R., 2013. "Comparative study of stand-alone and hybrid solar energy systems suitable for off-grid rural electrification: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 27(C), pages 738-752.
    25. Sinha, Sunanda & Chandel, S.S., 2015. "Review of recent trends in optimization techniques for solar photovoltaic–wind based hybrid energy systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 50(C), pages 755-769.
    26. Diaf, S. & Diaf, D. & Belhamel, M. & Haddadi, M. & Louche, A., 2007. "A methodology for optimal sizing of autonomous hybrid PV/wind system," Energy Policy, Elsevier, vol. 35(11), pages 5708-5718, November.
    27. Olatomiwa, Lanre & Mekhilef, Saad & Huda, A.S.N. & Ohunakin, Olayinka S., 2015. "Economic evaluation of hybrid energy systems for rural electrification in six geo-political zones of Nigeria," Renewable Energy, Elsevier, vol. 83(C), pages 435-446.
    28. Kanase-Patil, A.B. & Saini, R.P. & Sharma, M.P., 2011. "Sizing of integrated renewable energy system based on load profiles and reliability index for the state of Uttarakhand in India," Renewable Energy, Elsevier, vol. 36(11), pages 2809-2821.
    29. Das, T.K. & Chakraborty, D. & Seth, Swapan, 1990. "Energy consumption and prospects for renewable energy technologies in an Indian village," Energy, Elsevier, vol. 15(5), pages 445-449.
    30. Gupta, Ajai & Saini, R.P. & Sharma, M.P., 2010. "Steady-state modelling of hybrid energy system for off grid electrification of cluster of villages," Renewable Energy, Elsevier, vol. 35(2), pages 520-535.
    31. Baños, R. & Manzano-Agugliaro, F. & Montoya, F.G. & Gil, C. & Alcayde, A. & Gómez, J., 2011. "Optimization methods applied to renewable and sustainable energy: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 15(4), pages 1753-1766, May.
    32. Hiremath, Rahul B. & Kumar, Bimlesh & Balachandra, P. & Ravindranath, N.H., 2010. "Bottom-up approach for decentralised energy planning: Case study of Tumkur district in India," Energy Policy, Elsevier, vol. 38(2), pages 862-874, February.
    33. Carroquino, Javier & Dufo-López, Rodolfo & Bernal-Agustín, José L., 2015. "Sizing of off-grid renewable energy systems for drip irrigation in Mediterranean crops," Renewable Energy, Elsevier, vol. 76(C), pages 566-574.
    34. Deshmukh, M.K. & Deshmukh, S.S., 2008. "Modeling of hybrid renewable energy systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 12(1), pages 235-249, January.
    35. Mohammed, Y.S. & Mustafa, M.W. & Bashir, N., 2014. "Hybrid renewable energy systems for off-grid electric power: Review of substantial issues," Renewable and Sustainable Energy Reviews, Elsevier, vol. 35(C), pages 527-539.
    36. Georgilakis, Pavlos S. & Katsigiannis, Yiannis A., 2009. "Reliability and economic evaluation of small autonomous power systems containing only renewable energy sources," Renewable Energy, Elsevier, vol. 34(1), pages 65-70.
    37. Ismail, M.S. & Moghavvemi, M. & Mahlia, T.M.I. & Muttaqi, K.M. & Moghavvemi, S., 2015. "Effective utilization of excess energy in standalone hybrid renewable energy systems for improving comfort ability and reducing cost of energy: A review and analysis," Renewable and Sustainable Energy Reviews, Elsevier, vol. 42(C), pages 726-734.
    38. Bhandari, Binayak & Lee, Kyung-Tae & Lee, Caroline Sunyong & Song, Chul-Ki & Maskey, Ramesh K. & Ahn, Sung-Hoon, 2014. "A novel off-grid hybrid power system comprised of solar photovoltaic, wind, and hydro energy sources," Applied Energy, Elsevier, vol. 133(C), pages 236-242.
    39. Ferrer-Martí, L. & Domenech, B. & García-Villoria, A. & Pastor, R., 2013. "A MILP model to design hybrid wind–photovoltaic isolated rural electrification projects in developing countries," European Journal of Operational Research, Elsevier, vol. 226(2), pages 293-300.
    40. Ashok, S., 2007. "Optimised model for community-based hybrid energy system," Renewable Energy, Elsevier, vol. 32(7), pages 1155-1164.
    41. Akella, A.K. & Sharma, M.P. & Saini, R.P., 2007. "Optimum utilization of renewable energy sources in a remote area," Renewable and Sustainable Energy Reviews, Elsevier, vol. 11(5), pages 894-908, June.
    42. Hakimi, S.M. & Moghaddas-Tafreshi, S.M., 2009. "Optimal sizing of a stand-alone hybrid power system via particle swarm optimization for Kahnouj area in south-east of Iran," Renewable Energy, Elsevier, vol. 34(7), pages 1855-1862.
    43. Ouedraogo, Bachir I. & Kouame, S. & Azoumah, Y. & Yamegueu, D., 2015. "Incentives for rural off grid electrification in Burkina Faso using LCOE," Renewable Energy, Elsevier, vol. 78(C), pages 573-582.
    44. Blum, Nicola U. & Sryantoro Wakeling, Ratri & Schmidt, Tobias S., 2013. "Rural electrification through village grids—Assessing the cost competitiveness of isolated renewable energy technologies in Indonesia," Renewable and Sustainable Energy Reviews, Elsevier, vol. 22(C), pages 482-496.
    45. Sharafi, Masoud & ElMekkawy, Tarek Y., 2015. "Stochastic optimization of hybrid renewable energy systems using sampling average method," Renewable and Sustainable Energy Reviews, Elsevier, vol. 52(C), pages 1668-1679.
    46. Rajkumar, R.K. & Ramachandaramurthy, V.K. & Yong, B.L. & Chia, D.B., 2011. "Techno-economical optimization of hybrid pv/wind/battery system using Neuro-Fuzzy," Energy, Elsevier, vol. 36(8), pages 5148-5153.
    47. Valente, Luiz Carlos Guedes & de Almeida, Silvio Carlos Anı́bal, 1998. "Economic analysis of a diesel/photovoltaic hybrid system for decentralized power generation in northern Brazil," Energy, Elsevier, vol. 23(4), pages 317-323.
    48. Ashenayi, K. & Ramakumar, R., 1990. "IRES—A program to design integrated renewable energy systems," Energy, Elsevier, vol. 15(12), pages 1143-1152.
    49. Ellabban, Omar & Abu-Rub, Haitham & Blaabjerg, Frede, 2014. "Renewable energy resources: Current status, future prospects and their enabling technology," Renewable and Sustainable Energy Reviews, Elsevier, vol. 39(C), pages 748-764.
    50. Kanase-Patil, A.B. & Saini, R.P. & Sharma, M.P., 2011. "Development of IREOM model based on seasonally varying load profile for hilly remote areas of Uttarakhand state in India," Energy, Elsevier, vol. 36(9), pages 5690-5702.
    51. Upadhyay, Subho & Sharma, M.P., 2014. "A review on configurations, control and sizing methodologies of hybrid energy systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 38(C), pages 47-63.
    52. Iniyan, S. & Suganthi, L. & Jagadeesan, T.R., 1998. "Renewable energy planning for India in 21st century," Renewable Energy, Elsevier, vol. 14(1), pages 453-457.
    53. Wichert, B., 1997. "PV-diesel hybrid energy systems for remote area power generation -- A review of current practice and future developments," Renewable and Sustainable Energy Reviews, Elsevier, vol. 1(3), pages 209-228, September.
    54. Chauhan, Anurag & Saini, R.P., 2015. "Renewable energy based off-grid rural electrification in Uttarakhand state of India: Technology options, modelling method, barriers and recommendations," Renewable and Sustainable Energy Reviews, Elsevier, vol. 51(C), pages 662-681.
    55. Al-Karaghouli, Ali & Renne, David & Kazmerski, Lawrence L., 2009. "Solar and wind opportunities for water desalination in the Arab regions," Renewable and Sustainable Energy Reviews, Elsevier, vol. 13(9), pages 2397-2407, December.
    56. Chauhan, Anurag & Saini, R.P., 2014. "A review on Integrated Renewable Energy System based power generation for stand-alone applications: Configurations, storage options, sizing methodologies and control," Renewable and Sustainable Energy Reviews, Elsevier, vol. 38(C), pages 99-120.
    57. Upadhyay, Subho & Sharma, M.P., 2015. "Development of hybrid energy system with cycle charging strategy using particle swarm optimization for a remote area in India," Renewable Energy, Elsevier, vol. 77(C), pages 586-598.
    58. Abbes, Dhaker & Martinez, André & Champenois, Gérard, 2014. "Life cycle cost, embodied energy and loss of power supply probability for the optimal design of hybrid power systems," Mathematics and Computers in Simulation (MATCOM), Elsevier, vol. 98(C), pages 46-62.
    59. Yadav, Amit Kumar & Chandel, S.S., 2015. "Solar energy potential assessment of western Himalayan Indian state of Himachal Pradesh using J48 algorithm of WEKA in ANN based prediction model," Renewable Energy, Elsevier, vol. 75(C), pages 675-693.
    60. Fadaee, M. & Radzi, M.A.M., 2012. "Multi-objective optimization of a stand-alone hybrid renewable energy system by using evolutionary algorithms: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 16(5), pages 3364-3369.
    61. Bajpai, Prabodh & Dash, Vaishalee, 2012. "Hybrid renewable energy systems for power generation in stand-alone applications: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 16(5), pages 2926-2939.
    62. Ho, W.S. & Hashim, H. & Lim, J.S., 2014. "Integrated biomass and solar town concept for a smart eco-village in Iskandar Malaysia (IM)," Renewable Energy, Elsevier, vol. 69(C), pages 190-201.
    63. Nfah, E.M. & Ngundam, J.M. & Vandenbergh, M. & Schmid, J., 2008. "Simulation of off-grid generation options for remote villages in Cameroon," Renewable Energy, Elsevier, vol. 33(5), pages 1064-1072.
    64. Shivarama Krishna, K. & Sathish Kumar, K., 2015. "A review on hybrid renewable energy systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 52(C), pages 907-916.
    65. Sinha, Sunanda & Chandel, S.S., 2014. "Review of software tools for hybrid renewable energy systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 32(C), pages 192-205.
    66. Devadas, V., 2001. "Planning for rural energy system: part III," Renewable and Sustainable Energy Reviews, Elsevier, vol. 5(3), pages 271-297, September.
    67. Jana, Chinmoy & Chattopadhyay, R.N., 2004. "Block level energy planning for domestic lighting—a multi-objective fuzzy linear programming approach," Energy, Elsevier, vol. 29(11), pages 1819-1829.
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