S. X. WEI, Q. J. LIU
1322
4.2.3. Float Charge Mo d e
The float charge mode is the main way of long-running
The voltage of float charging is 235n. The system
changes it into main charge mode when the capacity is
shortage cause by outrage.
The battery can discharge with constant current. It can
keep the output power constant for a considerable time.
5. Summary and P
merous model of different
more and more attention.
se asynchronous gen-
d as accessing to
.
rospect
This article summarizes nu
electric-generation principle of distributed energy supply
access grid. They include distributed power supply and
distributed storage system. For the study of distributed
energy supply system attract
Distributed energy access to distribution network is the
future trend of the development of the power system.
Wind power generator mainly u
erator model, generally considere
dis-
tribution network directly. According to the needs of the
calculation accuracy, they can be handled as PQ or PQU
nodes. For photovoltaic power generation, the main con-
sideration is modeling of the relationship between the
output active power and sunshine intensity. In the case of
special requirements, it can adjust the reactive power by
using power electronic device. The modeling of the fuel
cell is that connect the battery to grid through the
switching of electric power electronic device, which con-
trol the output active and reactive power. The modeling
of microturbine is similar to the general synchronization
generator, but need to consider the effects produced by
power electronic control unit. Storage battery also need
power electronic device to access to distribution network,
and to take reasonable charge and discharge model ac-
cording to the different stages of charge and discharge.
According to the need of analysis and control of distrib-
uted energy supply system accessing to grid, we need to
build a unified mathematical model which consider dif-
ferent power generation principle. This model will pro-
vide a basis for power flow analysis, short-circuit current
calculation as well as a variety of advanced analysis
software for transmission and distribution network.
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