A Sensitivity-Based Three-Phase Weather-Dependent Power Flow Algorithm
for Networks with Local Controllers—Part I: Algorithm Development
Abstract
Local voltage controllers (LVCs) are important components of a
modern distribution system for regulating the voltage within permissible
limits. This manuscript presents a sensitivity-based three-phase
weather-dependent power flow algorithm for distribution networks with
LVCs. This Part I presents the theoretical development of the proposed
algorithm, which has four distinct characteristics: a) it considers the
three-phase unbalanced nature of distribution systems, b) the operating
state of LVCs is calculated using sensitivity parameters, which
accelerates the convergence speed of the algorithm, c) it considers the
precise switching sequence of LVCs based on their reaction time delays,
and d) the nonlinear influence of weather variations in the power flow
is also taken into consideration. Simulations and validation results
presented in Part II indicate that the proposed approach outperforms
other existing algorithms with respect to the accuracy and speed of
convergence, thus making it a promising power flow tool for accurate
distribution system analysis.
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