| Author | Islam, Mohammad Nazrul |
| Call Number | AIT Thesis no.ET-15-06 |
| Subject(s) | Voltage regulators
|
| 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 | This thesis demonstrated a method for online voltage stability assessment of a load bus using bus phasor measurements. Power system is represented by Thevenin equivalent model, which parameters are estimated by using new method based on discrete Kalman filter (DKF) and unscented Kalman filter (UKF). Two consecutive phasor measurements of bus voltage and load current are used to online estimate Thevenin equivalent parameter. Voltage stability index is calculated based on the condition of stability that, at maximum loadability point Thevenin equivalent impedance become equal to the apparent load impedance. Several measurement based methodology is proposed to assess long-term voltage stability using the advantage of PMU measurements. Current methods are facing accuracy problem on capturing system dynamics due to limitations in power system representation model. Proposed method is used a new model to represent power system dynamics for long-term voltage stability which is simple to implement. Performance of the method is tested with WSCC, 9-bus system in case of tracking instability point for gradual load increment and line outage. The result of DKF and UKF algorithm is compared with recursive least square (RLS) algorithm. The result shows that the proposed new methods can track Thevenin equivalent parameters with better accuracy and provide better result in case of quick adopting to the system dynamics. The developed voltage stability index can provide an indication for voltage collapse point. |
| Year | 2015 |
| 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) | Weerakorn Ongsakul |
| Examination Committee(s) | Singh, Jai Govind;Dhakal, Shobhakar; |
| Scholarship Donor(s) | Asian Institute of Technology Fellowship |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2015 |