Voltage collapse and power flow algorithms.

摘要

The development of Power Flow algorithms gave power system engineers the ability to monitor the power network both online and offline. Any power system analysis, at some point, has to use Power Flow algorithms to accurately analyze the system and ensure that it works properly and reliably in the event of a contingency.; A very crucial aspect of a power system analysis is the identification of the operating points where significant changes occur in voltage stability. Voltage problems are now a source of concern in highly developed networks as a result of load demand increase. For this reason, voltage collapse and voltage instability terms are appearing more frequently in the literature and in discussions of power system security, planning and operation. A system enters a state of voltage instability when a disturbance, increase in load demand, or change in system condition causes a progressive and uncontrollable decline in voltage. The main factor that causes voltage instability/collapse is the inability of the power system to meet the demand for reactive power.; In this thesis, we will try to examine how Power Flow algorithms behave under voltage collapse conditions. Many algorithms will be looked at including: Newton Raphson Power Flow (NRPF), Fast Decoupled Power Flow (FDPF), Power Flow using continuation methods (CPF), Non-iterative Power Flow using power series and continued fraction, and Optimal Power Flow (OPF). Furthermore, the effectiveness of Adaptive Localization Method during voltage collapse will be examined as well. Adaptive Localization Technique is used in power system security assessment.