Renewable powered Hybrid AD/DC home and community grid | |
| Author | Sasidharan, Nikhil |
| Call Number | AIT Diss. no.ET-16-04 |
| Subject(s) | Solar energy--Hybrid systems Biomass energy |
| Note | A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Engineering in Energy |
| Publisher | Asian Institute of Technology |
| Series Statement | Dissertation ; no. ET-16-04 |
| Abstract | The past decade has witnessed the unprecedented evolution and growth of renewable energy worldwide. There has been a substantial increase in the capacity and production of all renewable technologies and also growth in supporting policies. Due to the increase in renewable energy generation and deregulation, the world’s electric power system changes to a distributed system than a centralized system. The distributed generation includes both renewable and non-renewable energy sources. Due to its location and smaller size, there are a lot of power system problem which can be categorized as power quality issues, reactive power coordination and marginal problems in transmission systems. To avoid the drawbacks of distribution generation in main grid system, power system is planning to divide into micro grid system which possess enough generation and it will work in both as grid connected mode and autonomous mode. Though this study is equally applicable to countries of Europe and Asia, this dissertation and its case study mainly focuses on the domestic electrical sector and policies used in Thailand. The electric energy sector in Thailand is mainly dependent upon the fossil fuels. It is estimated that there is an increase in demand, almost double in the year 2030 which will be mainly met with the alternative energy sources. Energy Efficiency Development Plan by Energy Policy and Planning Office (EPPO), Thailand in the 20th year proposes a reduction of 38845 ktoe in annual energy consumption. In the Alternative Energy Development Plan (AEDP 2012: 2021), the target is set on using 25% renewable energy of total energy consumption in 2021 to avoid the import of electrical energy. In order to achieve these goals one of the suggestions is to implement and trap more energy from solar; as Thailand is blessed with rich solar energy which has annual average daily solar radiation of about 5.0 to 5.3 kWh/m2/day, corresponding to 18-19 MJ/m2/day This study will demonstrate the trapping process of solar energy in the basic level, that is roof top solar panel in the residential buildings and facilitate to modify the house hold AC distribution system into novel Hybrid AC/DC system for more efficiency and reliability. This Home grid system is formed by analyzing the distortion produced by the modern household equipment and K-factor with a significant role in overheating of residential/distribution transformers is determined. This system eliminates redundant power conversion stages and mitigate the loss due to the harmonics by a shift of harmonic intensive loads to Direct Current (DC) network side. Its effectiveness has been investigated with simulation in MATLAB as well as hardware implementation. This proposed energy efficient Home grid model could be quite helpful in fulfilling idea of Net Zero or surplus energy buildings. There is no sophisticated inverter topology for solar powered Hybrid AC/DC home with a battery storage. So, in this study, a novel reconfigurable single phase single stage solar inverter topology is proposed and validated with hardware implementation. Load modelling is a significant component in power system studies in order to ensure the reliable and economic operation. Even though real time exact load model especially for modern residential feeder is very difficult to obtain which consists of nonlinear home appliances, it is still possible to make an appropriate individual appliances load model that can improve the accuracy of simulation studies. This study also make the ZIP model of household loads which can be utilized for the load demand forecasting purposes in the power flow studies. The restructuring of the electric supply industry has prompted the situation, where customer is a critical business player. This has also made the maintaining of reliability and stability in the power system a monetarily crucial task. Selfresilient community grid is a realization of reliable and stable system at a customer’s level as individual households with solar photovoltaics or other renewable system can sustain itself even if the power grid fails. In this dissertation, an ancillary services provision for the main grid, by using a DC community grid as source of power is proposed. The individual homes are divided into hybrid AC/DC homes. The interconnection between the AC/DC houses is done using a 500 V DC line. |
| Year | 2016 |
| Corresponding Series Added Entry | Asian Institute of Technology. Dissertation ; no. ET-16-04 |
| Type | Dissertation |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Energy and Climate Change (Former title: Department of Energy, Environment, and Climate Change (DEECC)) |
| Academic Program/FoS | Energy Technology (ET) |
| Chairperson(s) | Singh Jai Govind ; |
| Examination Committee(s) | Weerakorn Ongsakul ;Dhakal Shobhakar ;Shrestha Sangam ; |
| Scholarship Donor(s) | Asian Institute of Technology Fellowship; |
| Degree | Thesis (Ph.D.) - Asian Institute of Technology, 2016 |