14-07-2014, 02:32 PM
COMPARISON OF DISTRIBUTION SYSTEMS POWER FLOW
ALGORITHMS FOR VOLTAGE DEPENDENT LOADS
COMPARISON OF DISTRIBUTION.pdf (Size: 436.3 KB / Downloads: 46)
ABSTRACT
In this paper, the convergence ability of Distribution
Systems Power Flow Algorithms, which are widely used for
distribution systems analysis, is compared with different
voltage-dependent load models. The convergence ability of
methods are also evaluated for different tolerance values,
voltage levels, loading conditions and R/X ratios, under the
wide range exponents of loads. Results show that Ratio-Flow
method is preferable from other methods.
. CONCLUSIONS
In this paper, convergence ability of distribution system
load flow methods which are widely used for distribution
systems load flow solution is analysed on ill-conditioned
radial systems with different voltage-dependent load
models. Four methods has been applied to 12-bus
distribution system (without laterals) and 30-bus
distribution system (with three laterals). The load flow
problem has been successfully solved with different static
load types and results obtained by using four methods
have been compared. The results have been evaluated
under different tolerance values, different voltage levels,
different loading conditions and different R/X ratio,
under the wide range of the exponents of the loads in the
30-Bus radial distribution systems. The results show that
the Ratio-Flow method is simple and has fast
convergence ability. Moreover, it needs less number of
iteration and less sensitive to the distribution system
parameters than Forward-Backward Substitution method
and Ladder Network Theory. Moreover, Classical
Newton-Raphson method did not converged for 30-bus
distribution system.