| Summary: | 博士 === 國立成功大學 === 電機工程研究所 === 84 === In this dissertation, the steady-state small dis -turbance
voltage stability limit for a radial distribution system
is thoroughly analyzed. The solutions for radial
distribution systems. By this method, an equivalent 2-bus
network can be obtained during the solving process. Based
on the 2-bus network, the steady-state load limit and
voltage stability limit are investigated. The circle
diagrams and Jacobian determinant are developed first to
derive the load limit and voltage stability limit for radial
distribution systems. For the purpose of checking the limits
equations derived by the authors, the well-known L stability
indicator is adopted for the task of justification.
The consistency among these methods is shown. It is
shown that the positive Jacobian determinant
corresponds to an L indicator less than 1 which meets the
voltage stability criterion. To show the effects of load
models on the voltage stability limit, a composite load
model composed of a part of constant power load, a part of
constant impedance load and a part of constant current load
is adopted to derive the general equation of voltage stability
limit. It is found that the voltage stability problems
are mostly caused by the constant power load. In the
literature, almost all the tasks of proving the uniqueness
of a voltage solution for a radial distribution system are
based on a 2-bus system. In this dissertation, the authors
derive a general equation of the [dV/dP] of load bus, and by
checking the sign of [dV/dP] of each load bus, the
uniqueness of a voltage solution can be shown. The method of
proof developed is more general than those methods published.
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