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Contingency analysis plays a key role in evaluating the performance of a system under stressed conditions. This paper proposes Trajectory Violation Integral (TVI) index as a measure to quantify the effect of contingency. Contingency clustering enables partitioning of the system into coherent and independent Voltage Control Areas. The data that is worked on during contingency clustering is of high...
This paper presents a placement method of fuzzy logic based unified power flow controller (UPFC) in power system network by analyzing dynamic voltage stability. Voltage stability indices namely LQP and voltage collapse point indicators (VCPI) indices are used to determine the weakest line for UPFC by dynamic load variation. The controllers of the shunt and series converters of the UPFC are developed...
Conventional load shedding control strategy adjusts undervoltage load shedding and underfrequency load shedding respectively, and undervoltage load shedding only focuses on local voltages without consideration on characters of transient voltage responses. This paper analyses the relationship between the disturbance scale and transient voltage drops, thus proposing a novel index for the disturbance...
This paper presents an on-line equivalent algorithm for power system based on phasor measurement unit. The method considers the changes of the system parameters and load level, which overcome parameters rift problem and the shortage of traditional two points power flow method that supposing the parameters are fixed after a small disturbance. On this basis, voltage stability and Alert margin are proposed,...
This paper presents a dynamic security assessment solution, which can be used in the system control room to improve system stability. It is based on a set of security indices. The indices are able of establishing contingencies' severity levels as a measure of different aspects of power system security. A system based on fuzzy logic is used to combine the indices into a single composite index. The...
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