1. Introduction
Gotikhel Hydropower Plant (GHP) is one of the nearest Isolated Micro Hydropower Plant (MHP) from the main city out of 650 isolated MHPs available in Nepal which still supplies electrical power to 173 Households, one hull machine and one school. The extension of national grid has made life of MHPs insecure as consumers want the energy from more reliable source i.e. from national grid. In the context of Nepal, especially in rural areas, construction of MHPs are very costly and because of unplanned extension of national grid, some of MHPs are in closing conditions and same cases will continue more in future. So, there is a huge risk in big investments and valuable efforts of villagers.
Synchronization of MHPs to the national grid will be the ultimate solution for the existence of MHPs in Nepal. So, this Master Thesis will also focus on grid connection of GHP and consequent impacts on technical as well as financial sectors before and after the grid connection of GHP.
2. Objectives
Taking GHP as a private/ community pilot project for grid connection in Nepal, the following objectives of grid-connected MHPs has been generalized:
• To ensure optimum use of national resource and fulfill the possible new demand of energy in rural areas since grid connection and Power Exchange Agreement (PEA) allow the Rural Electrification Entity (REE) to sell their excess energy to Nepal Electricity Authority (NEA) grid and the REE can purchase the required energy from the grid when the demand of its members surpass the generation by MHP(s) under it.
• To facilitate development of new MHPs by local communities, Individual Power Producers as they can profiteer by selling the excess energy to the grid.
• To ensure market for spill energy of MHPs.
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3. Contents of the thesis
This thesis includes following:
• Introduction of GHP
• Problem Analysis of GHP
• Technical aspects of GHP
- Turbine and turbine selection
- Turbine Control System
- Generator
- Distribution Transformer
- Switchgear Equipment
- Protection system
- Transmission and distribution systems
- Instrumentation
- Single line diagram of GHP
- Synchronization
• Short circuit and load flow analysis
• Financial aspects of GHP
• Impacts of grid connection
• Conclusion
Inhaltsverzeichnis (Table of Contents)
- INTRODUCTION.
- GENERAL
- GOTIKHEL MICRO HYDROPOWER PLANT
- OBJECTIVES OF GRID CONNECTION OF GHP.
- GHP IN GENERAL
- GENERAL LAYOUT..
- SALIENT FEATURES OF GHP
- PROBLEM ANALYSIS OF GHP
- PROBLEM ANALYSIS OF EXISTING GHP
- Forebay...
- Penstock.
- Pelton Turbine
- Induction/Asynchronous Generator.
- Electrical Cabinet..
- PROBLEM ANALYSIS FOR GRID CONNECTION
- TECHNICAL ASPECTS OF GRID CONNECTION
- TURBINE AND TURBINE SELECTION
- Pelton Turbine
- Cross Flow Turbine...
- Turbine Selection..
- TURBINE CONTROL SYSTEM
- GENERATOR
- Synchronous Generator
- Sizing of Synchronous Generator for MHP in Nepal.
- DISTRIBUTION TRANSFORMER..
- SINGLE LINE DIAGRAM OF GHP.
- SHORT CIRCUIT ANALYSIS OF GHP
- SWITCHGEAR EQUIPMENT....
- Low Voltage Circuit Breaker.
- Surge Arrester
- Fuses..
- PROTECTION SYSTEM.
- CONNECTION BETWEEN GHP AND NEA
- INSTRUMENTATION
- Current Transformer.
- Meter..
- SYNCHRONIZATION....
- LOAD FLOW ANALYSIS OF GHP
- FINANCIAL ASPECTS OF GRID CONNECTION
- METHODS USED FOR FINANCIAL ANALYSIS OF GHP
- Internal Rate of Return
- Net Present Value..
- Benefit/ Cost Ratio.
- Payback Period.
- FINANCIAL ANALYSIS OF GHP.
- POSSIBLE IMPACTS OF GRID CONNECTION
- TECHNICAL IMPACTS OF GRID CONNECTION
- FINANCIAL IMPACTS OF GRID CONNECTION.
Zielsetzung und Themenschwerpunkte (Objectives and Key Themes)
This master’s thesis explores the technical and financial feasibility of connecting the Gotikhel Micro Hydropower Plant (GHP) to the national grid in Nepal. It examines the existing problems within the GHP, analyzes the technical aspects of grid connection, including turbine selection, generator sizing, and protection systems, and conducts a load flow analysis to assess the impact of grid connection on the system. The study also addresses the financial implications of grid connection, evaluating the economic viability of the project through various financial metrics.- Technical Feasibility of Grid Connection
- Financial Viability of Grid Connection
- Problem Analysis and Mitigation Strategies for the Existing GHP
- Technical Aspects of Grid Connection: Turbine Selection, Generator Sizing, Protection Systems, etc.
- Impact of Grid Connection on System Performance
Zusammenfassung der Kapitel (Chapter Summaries)
- Chapter 1 provides an introduction to the Gotikhel Micro Hydropower Plant (GHP) and outlines the objectives of connecting it to the national grid in Nepal.
- Chapter 2 offers a detailed overview of the GHP, including its general layout and salient features.
- Chapter 3 analyzes the problems encountered with the existing GHP, focusing on aspects such as the forebay, penstock, turbine, generator, and electrical cabinet. It also explores the challenges posed by grid connection.
- Chapter 4 delves into the technical aspects of grid connection, covering turbine selection, turbine control systems, generator design, distribution transformer sizing, short circuit analysis, switchgear equipment, protection systems, and synchronization procedures.
- Chapter 5 conducts a load flow analysis to assess the impact of grid connection on the system, considering different scenarios with varying village load and GHP operation.
- Chapter 6 examines the financial aspects of grid connection, presenting methods used for financial analysis, including internal rate of return, net present value, benefit/cost ratio, and payback period. It also discusses the financial analysis of the GHP project.
- Chapter 7 explores the potential technical and financial impacts of grid connection on the GHP and the surrounding communities.
Schlüsselwörter (Keywords)
This thesis focuses on the technical and financial aspects of grid connecting a micro hydropower plant in Nepal, highlighting the challenges and benefits associated with such an endeavor. Key areas of investigation include turbine selection, generator sizing, short circuit analysis, load flow analysis, and financial viability through methods such as internal rate of return and net present value. The study also explores the technical and financial impacts of grid connection on the system and the local communities.- Quote paper
- Suman Budhathoki (Author), 2011, Grid Connection of Gotikhel Micro Hydropower Plant without Interrupting Isolated Load, Munich, GRIN Verlag, https://www.grin.com/document/181739
