1. Title Design and Optimization of general control and protection strategy to evacuate power from Jumdi Hydropower Project. 2. Project Description Most of the energy projects like hydro, thermal are far away from the load centers. Thus, power is to be evacuated from these power plants and transmitted using long transmission lines. The power evacuation from power plant means extracting power from power plants by connecting it to existing transmission and distribution networks or by erecting new transmission and distribution networks. The power evacuation also involves determination of power transmission capability of existing lines, determination of available margins of existing systems and design proper transmission and distribution systems considering load growth and possibility of arrival new power projects. Since the electrical energy should be distributed at cheaper price and at required quality and quantity, the power evacuation should be justifiable technically and financially. Normally, attention towards transmission and distribution system capacity, system performance (losses, voltage drop, and line loading), finance involved is not being paid before evacuating power from power plants. The normal trend is to connect the new power plants to the exis ting systems without proper power evacuation analysis, which makes overall system inefficient. If new transmission and distribution networks are to be erected for evacuating power, then they should be designed considering the load growth and possibility of arrival of new power projects in the future in that area. Otherwise, the existing systems (transmission and distribution) may have to be replaced. Thus, for efficient power evacuation, technical and financial assessment considering future load growth should be carried out before evacuating power from the power plants. This project concerns to find out possible alternatives for the evacuation of power from Jumdi Hydropower Project (JHP) and propose best power evacuation alternative for Jumdi Hydropower Project considering both technical and financial aspects. The project is also concerned with optimal design of control and protection scheme required for the proposed best power evacuation alternative to map out system reliability and outages. The project is done under the supervision of Mr. Surya Prasad Adhikari, Planning and Design Engineer, Butwal Power Company and Mr. Roshan Bhattarai, Assistant Professor, Kathmandu University with the collaboration of Butwal Power Company. This project is done for specific Jumdi Hydropower Project. So, it will certainly benefit its investor Butwal Power Company (BPC) because BPC will get information about current status of existing networks apart from best power evacuation alternative for Jumdi Hydropower Project. The “power evacuation” is new area and hence this project will also benefit all the participants of the project because knowledge gained from this project will be useful to conduct such type of power evacuation projects in other parts of country as well.
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3. Background Jumdi Hydropower Project is 2MW upcoming project under the investment of Butwal Power Company (BPC). The project is located in Gulmi district. BPC has its own transmission and distribution networks in certain parts of Rupendehi, Palpa, Syanj ha, Gulmi, Arghakhanchi and Pyuthan districts and it wants to connect the Jumdi Hydropower Project in its existing networks in efficient way. Thus, the main focus of the project is to study the current status of existing transmission and distribution networks owned by BPC and find out possible alternatives of power evacuation and finally propose best power evacuation alternative for Jumdi Hydropower Project. The project area is rich in water resources and there is high possibility of arrival of other hydropower projects in the near future. Thus, from the perspective of BPC, it is also very important to know whether the existing networks will support if other hydropower projects come in that region or they need to be upgraded to cope up with increased power flow after the arrival of new hydropower projects or with future energy demand of that region. Thus, another aspect of this project will be to perform load forecasting and analysis regarding conductor size and other protective equipments requirement considering future energy demand and propose suitable model of transmission and distribution networks which can take power if other hydropower projects are connected to it in the future or can supply increased future energy demand. This project is done as per requirement of BPC and BPC has its transmission and distribution networks in Rupendehi, Palpa, Syanjha, Gulmi, Arghakhanchi and Pyuthan districts. Thus, the research work and data collection for this project is limited in these areas only. Jumdi Hydropower Project is located in Gulmi district and other power developers like GTZ, NEA, Winrock and DoED are also electrifying the region. Thus, literature and data/information will be collected through these organizations apart from BPC. 4. Statement of goals and objectives The outcome of this project should help BPC for implementing technically sound and financially viable power evacuation strategy to evacuate power from Jumdi Hydropower Project.Thus,the objective of this project is to provide information regarding line length (both 33 and 11KV), loading of transformers (33/0.4KV and 11/0.4KV) at different districts, different power evacuation alternatives from Jumdi Hydropower Project, solution of load flow analysis of different power evacuation alternatives, technical and financial analysis of different alternatives and finally propose best power evacuation alternative for Jumdi Hydropower Project considering both technical and financial aspects.
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5. Methodology Since the objective of the project is to find best power evacuation alternative considering both technical and financial aspects, the project can de divided into two sections namely technical section and financial section. The technical section covers data collection, reliability analysis and load flow analysis while financial section covers data collection and financial analysis. The different tasks to achieve objective of the project are summarized as follows: • • • • • • literature review and data collection find out possible power evacuation alternatives perform reliability analysis of all possible alternatives perform financial analysis of all possible alternatives perform Load Flow Analysis of all possible alternatives propose the best power evacuation alternative considering both technical and financial aspects
Since the power evacuation is relatively new topic at least in the context of Nepal, it seems that there is not much studies going on it, therefore it is expected to collect literature regarding power evacuation system through the internet. The data required for the project are collected through field visits and from the organizations like BPC, GTZ, Winrock and DoED.The data required for the project are: • • • • • • • status of 33KV line and 33KV substation status of 11KV line and 11KV substation status of protective equipments like relays, circuit breakers and auto reclosures loading of 11/0.4KV and 33/0.4KV transformers data regarding the outages and failure of equipments and protective devices single line diagram of the project area data regarding conductor cost and cost of other equipments
The single line diagram for the six above mentioned districts owned by BPC has been collected which gives idea about location of transformers, transmission and distribution networks in the six above mentio ned districts and information regarding current status of 11KV, 33KV line and substation, loading of different transformers. Thus, information from single line diagram and field visit will help to find possible power evacuation alternatives. The financial analysis of each alternative is done and the options which are financially feasible are found out. The alternatives which have low initial investment or good rate of return or short payback period are more attractive.
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The reliability analysis is done for each alternative to find most reliable power evacuation option from possible alternatives. The load flow analysis considering load growth are done for all possible alternatives and the alternatives which have less voltage drop, low transmission loss and optimum line loading are considered to be technically good. Finally, the alternative which is both technically and financially sound is selected but the selected alternative should be reliable i.e. it should have very few outages. 6. Tools and software The financial analysis of different possible power evacuation alternatives is done on the basis of Internal Rate of Return ( IRR), Benefit-Cost Ratio (B-C Ratio) and Payback Period. The financial analysis using above mentioned methods is done in Excel. The project requires load flow analysis of different power evacuation options. For the load flow analysis, NetBas software is used. For 11KV radial distribution network, simple and efficient method of load flow solution based on algorithm developed by D.Das, Department of Electrical and Electronic Engineering, BITS, Pilani, India, D.P. Kothari Center of Energy studies, Indian Institute of Technology, New Delhi, India, A. Kalam, Department of Electrical and Electronic Engineering, Victoria University of Technology, Melbourne, Australia will be used. 7. Work Plan The project schedule has been prepared in MS Project. The project starts from 15th July 2005 and ends at 15th November 2005. The length of schedule excluding project selection and project proposal preparation time is about 4 months. About 20 days have been spent for project selection and preparation of project proposal. For the timely completion of the project, the project work has been split into several parts and milestones are fixed for draft report submission and final report submission. The different parts of the project are as follows: • • • • • • • • • project selection and project proposal preparation literature survey and data collection load flow analysis of different possible power evacuation alternatives financial analysis of different possible power evacuation alternatives reliability analysis of different possible power evacuation alternatives determination of best power evacuation alternative by comparing all possible alternatives in terms of technical and financial considerations design of control and protective equipments for best power evacuation alternative draft report preparation final report preparation
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