Voltage stability assessment and enhancement in a deregulated electricity market environment | |
| Author | Adhikari, Sarina |
| Call Number | AIT Thesis no.ET-05-19 |
| Subject(s) | Electricity--Marketing Electric utilities--Deregulation Electric power system stability--Evaluation |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | With the introduction of deregulation of electricity power industry, the system operators are facing major challenges in operation and control of power system, and improvement of the system reliability, quality and security. In this new environment, various market participants are found to compete for the same transmission system usage resulting in excessively stressed systems. At the same time, shortage of generation facilities at the nodes with high demands is quite considerable. These factors have led the fact that voltage instability problem should be taken as a matter of serious concern in this circumstance. Several incidents of blackouts throughout the world triggered by voltage instability have been reported over the last few decades. With this history, voltage instability is recognized as one of the main functional challenges in the present electricity power industry. The thesis encompasses an entire process of voltage stability assessment for a power system operated in a deregulated market environment. This includes an intricate process of assessment of voltage stability for the base case operating condition, contingency analysis, assessment for the post disturbance system condition and the enhancement of stability margin for the severe contingency through the use of Static Var Compensators (SVCs). For the contemporary analysis, centralized power pool market model is considered and it is modeled as an Optimal Power Flow (OPF) framework, the objective in OPF formulation being maximization of net social welfare. The voltage stability criterion is incorporated as a constraint of the optimization problem. The study incorporates analysis considering only price inelastic demands, the combination of price inelastic and price elastic demands and only price elastic demands respectively so as to observe the effects of price elasticity on the system loadability.The assessment of voltage stability in the form of system loadability is also done for the post contingency cases. For the purpose of enhancing stability in the case of severe contingency, a well known FACTS device, Static Var Compensator (SVC) is incorporated in the OPF formulation. The placement of SVC is based on the sensitivity index of maximum loading condition to the reactive power injection of SVC. The sizing of SVC is based on the optimization of the same objective function. The results are obtained for 6-bus, modified IEEE-14 bus and modified IEEE 30-bus test systems. The results show that voltage stability assessment can be carried out with this novel problem formulation where maximum loading condition is obtained as a combination of elastic and inelastic loads. Similarly, SVC' is proved to be highly favorable for the enhancement purpose in order to procure the post disturbance stability |
| Year | 2005 |
| 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) | Nadarajah, Mithulananthan |
| Examination Committee(s) | Weerakom Ongsakul;Surapong Chirarattananon |
| Scholarship Donor(s) | Government of Norway (NORAD) |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2005 |