Information Technology Reference
In-Depth Information
comprehensively. The formulation has given due consideration to the manufacturing
cost and economic factors viz., market in
ation and creditor interest rates on them.
This provides a more realistic approach to the problem.
fl
3.1 Load Flow
In this section, the modelling of the distribution system at fundamental and har-
monic frequencies is discussed. Generally, the capacitor placement problem is
solved at the fundamental frequency. However, the power distribution system being
non-linear in nature, harmonics are present in the voltages and currents. Therefore,
the placement problem can be solved at both, fundamental, as well as, harmonic
frequencies.
3.1.1 Modelling at Fundamental Frequency
The distribution system is highly coupled system. Therefore, the commonly used
load
flow models, utilizing the single-phase nature of the distribution system are not
utilized to solve it. For solving the radial distribution system, such as given in
Fig.
4
, with line section l between nodes i and j having shunt admittances and loads
attached to each node, three-phase backward-forward load
fl
flow (Cheng and Shir-
mohammadi
1995
) is used. Using it, the distribution system can be solved in three
steps, as.
fl
1. Nodal current calculation
y
c
;
l
2
V
j
;
k
S
L
;
n
V
i
;
k
I
i
;
k
¼
þ
ð
4
Þ
where, y
c,l
is the shunt admittance in section-l, S
L,i
and S
L,j
are the apparent
power of loads on buses i and j, V
i,k
is voltage of bus at iteration k.
Fig. 4 Line section of distribution system connecting two buses
Search WWH ::
Custom Search