NOVATEUR PUBLICATIONS JournalNX- A Multidisciplinary Peer Reviewed Journal ISSN No: 2581 - 4230 VOLUME 4, ISSUE 7, July -2018 10 | Page GRID INTEGRATION ANALYSIS FOR COGENERATION AND CAPTIVE PLANT IN SUGAR INDUSTRY: A CASE STUDY OF INDUSHANKAR SUGAR INDUSTRY PVT. LTD., SARLAHI, NEPAL AJAY KUMAR JHA Department of Mechanical Engineering, Pulchowk Campus, Institute of Engineering, Tribhuvan University, Nepal Corresponding author: akjha@ioe.edu.np (A. K. Jha) SANJEEV RAY Department of Mechanical Engineering, Pulchowk Campus, Institute of Engineering, Tribhuvan University, Nepal ABSTRACT: The electricity sector in Nepal is currently facing the formidable challenges of an insufficient installed capacity, a sub-optimal infrastructure, circular debt and revenue shortage. All of the problems hamper socioeconomic activities. The demand of energy has been consistently increasing annually and the peak demand growth rate of around 10% per year requires addition of generation as well. Nepal, today, experiences a peak power shortage of 12% and an energy shortage of about 8%. To fulfill the gap of demand and supply, integration of industrial cogeneration and captive plant play significant roles. Numerous countries across the globe are consuming bagasse to generate electricity, but regrettably in our country, this valued renewable resource has mostly been thrown away as a mere trash. Analysis of exportable power from sugar industries is an important aspect of the disclosure on grid integration of captive cogeneration plant and resulting environmental impact. This study aimed at investigating exportable power from Indushankar Sugar Industry Pvt Ltd. and analyze the impact of surplus power fed on distribution grid.The GHGs emission is also estimated for bagasse-based cogeneration. The study shows Indushankar Sugar Industry can export upto7.61 and 5.4 MW during crushing and non- crushing seasons with addition of backpressure condensing turbine in existing cogeneration facility. The simulation study shows losses on feeder lines, busses and transformer as well as percentage voltage drop on the network decreases with the increase in power export. The terminal voltage at different load point also get improved. The short circuit analysis shows the fault level increases with the addition of generating units on distribution grid.The total GHG emission ranges from 1010.88 - 3489.11tons CO2eq, against the power generation of 15.55-53.68 GWh, which is expected to avoid the emission of 3250.08 - 38135.99 tons CO2eq, if the power exported from sugar industry replace the power generated from diesel plant in the industrial area or NEA’s diesel plant. KEY-WORDS: Sugar industry; Captive Plant; Grid Integration; Environmental Impact. 1. INTRODUCTION: Nepal is facing increasing power shortage from the last decades. Present installed capacity of Integrated Nepal Power System (INPS) is around 800 MW while the peak demand is of the order of 1400 MW \cite{nea2016}. Even after imports of around 150 MW at different location from India, there is a shortage of 450 MW. The total energy import from India was 1,758.41 GWh which constitute 23% of total energy requirement in 2015/16\cite{nea2016}. This scenario has raised serious concerns and thus, the Government of Nepal (GoN) has brought various remedial measures and is offering incentives for private investment to generate electricity to bridge electricity supply and demand gap\cite{moen2072}. The government has lately brought a strategy to promote and improve its share of renewable in the energy basket as well for matching the demand and supply of energy\cite{moen2072}. In this scenario, with the increasing demand for rational energy generation, the application of captive and cogeneration power plant in Nepalese sugar industries plants has gained interest. These then need to be integrated with the national/regional power grid. It is therefore of interest to analyze how much energy from sugar industries in exportable to national or regional grid for sustainable energy solution. During lean session, the shortage of power becomes more severe\cite{firoj2016}. To cope with this situation, electricity authorities are imposing load shedding and power cuts. At present the cost involved for adding new generation capacity is about 1.5-2 million USD per MW\cite{shyam2016}. Besides this, the cost of transmission and distribution comes to about 1 million USD per Km. Moreover, Nepalese power sector has power generation mainly from ROR type hydropower plants, which are snow fed, and get dry during the