A decentralized primary frequency response and virtual inertia control of energy storage units for a hybrid renewable energy microgrid system | |
| Author | Tiwari, Shubham |
| Call Number | AIT Thesis no.ET-19-19 |
| Subject(s) | Microgrids (Smart power grids) Renewable energy sources Hybrid systems |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Energy |
| Publisher | Asian Institute of Technology |
| Abstract | High penetration of renewable energy resources in grid due to its fluctuating nature causes impactful disproportion in load – generation portfolio. If grid is isolated, then this cause severe impact on stability of small grid. Paper investigates a novel decentralized control strategy for the static energy systems to stabilize isolated self-supportive microgrids. Paper propose a mathematical formulation to estimate and quantify emulated digital inertia by static renewable generators. To evaluate the performance of proposed methodology, a microgrid comprises of conventional synchronous generator, solar P.V, fuel cells as generating units with batteries and supercapacitors acting as dump units are modelled. To analyze the effect of low inertia, two scenarios are discussed. In first, a synchronous generator with high rating is modelled with predefined solar and fuel cell generation, is integrated to form a high inertia system. In second scenario, size of synchronous generator is reduced with increased penetration of solar and fuel cell power, to simulate low inertia system. Instabilities are created by sudden change in load and generation. To support frequency and to emulate inertia, the dump units i.e. batteries and supercapacitors are deployed with primary frequency response controller and inertia controller, respectively. Moreover, to make system more decentralize, in later section fuel cells attributes are explored to provide frequency support. The effectiveness of controllers is shown graphically with mathematical validation by proposed numeric approach to quantify inertia. Thesis will ensure that a decentralized approach enabling all generators to dispatch the active power support, will not only regulates the frequency nadir points but also reduces the need of active power in doing so. Thus, reducing the electrical stress on each unit responsible for providing support to the microgrid against the high penetration of RESs |
| Year | 2019 |
| Type | Thesis |
| 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) | Roy, Joyashree;Weerakorn Ongsakul; |
| Scholarship Donor(s) | Asian Institute of Technology Fellowship; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2019 |