| Summary: | 碩士 === 國立成功大學 === 電機工程研究所 === 83 === Analysis of voltage stability limit is an important topic in
the study of a distribution system. In this thesis, the effects
of different types of static loads is investigated on the
steady-state voltage stability limit for a radial distribution
system. The loads adopted in the investigation include constant
power loads, constant impedance loads and constant current
loads. Furthermore, the uniqueness and existence of the voltage
solution are discussed. In solving the load flow problems of
the radial power network, the DistFlow technique has been
proposed as the most suitable method. In this method, an
equivalent two-bus network will be obtained simultaneously.
Based on that, the analysis in this thesis is mainly
concentrated on the two-bus system. The detailed simulated
results are presented to justify the opinions proposed.The
result reveal that when a larger part of constant current or
constant impedance load is added to the total load, the voltage
stability limit will move far into the lower branch of the P-V
curve and multiple load flow solutions may exist.
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