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Due to the academic value and practical applications, the
objective of this dissertation is centered around the developing
of a voltage stability index and the implementing of a computer
program for voltage stability analysis. The main contributions
of this dissertation are: (1) To propose a block incremental
algorithm to calculate the minimum singular value of the power
flow Jacobian matrix as an index ofvoltage stability; (2) To
develop a widely convergent load flow method to be utilized to
simulate the load flow process for a longer duration up to
voltage collapse; (3) To implement a sparse matrix technique
basedpractical computer program for voltage stability analysis
considering loadgrowth pattern, reactive power limits of
generators, transformers tap changer control , the generation
commissioning etc.. The implementedprogram can not only provide
the desired voltag stability index fora specific operating
point, but also can provide the operating margin to voltage
collapse for the same system condition; (4) Finally, based on
the developed program, thorough voltage stability analysis of a
practicalpower system is made. This includes evaluating the
effects of the voltagestability due to tripping or addition of
transmission lines, the addition of static capacitors, modes of
load shedding etc..
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