shengyuan外文文献翻译

2021年1月19日发(作者：vesine)

Power Supply and Distribution System





The revolution of electric power system has brought a new big round construction,which is
pushing
the
greater
revolution
of
electric
power
technique
along
with
the
application
of
new
technique and advanced equipment. Especially, the combination of the information technique and
electric power technique, to great ex- tent, has improved reliability on electric quality and electric
supply.
The
technical
development
decreases
the
cost
on
electric
construction
and
drives
innovation of electric network.





This
dissertation
introduces
the
building
condition
of
distribution
automation(DA),
and
brings forward two typical construction modes on DA construction, integrative mode and fission
mode .It
emphasize
the
DA
structure
under
the
condition
of
the
fission
mode
and
presents
the
system configuration, the main station scheme, the feeder scheme, the optimized communication
scheme etc., which is for DA research reference.





Not only do the dissertation design a way founded on the magrginal electric price fitted to
our present national electric power market with regards to future trends of electric power market
in China and fair trade under the government surveillance, that is group competitio n in short- term
trade under the way of grouped price and quantity harmony, but also puts forward combination
arithmetic, math model of trading plan and safty economical restriction. It can solve the original
contradiction between medium and long term contract price and short term competitive price with
improvement
on
competitive
percentage
and
cut
down
the
unfair
income
difference
of
electric
factory, at the same time, it can optimize the electric limit for all electric factories and reduce the
total purchase charge of electric power from burthen curve of whole electric market network.

Electricity system state is estimated to be one of the key techniques in DA realization. The
dissertation
recommends
the
resolvent
of
bad
measurement
data
and
structure
mistake
on
the
ground
of
describing
state
estimate
way.
It
also
advances
a
practical
test
and
judging
way
on
topology mistake in state estimate about bad data test and abnormity in state estimate as well as
the problem and effect on bad data from state measure to state estimate .As for real time monitor
and control problem, the dissertation introduces a new way to solve them by electricity break and
exceptional analysis, and the way has been tested in Weifang DA.
Concerning
the
lack
of
concordant
wave
on
preve
nting
concordant
wave
and
non-power
compensation
and non-continuity
on
compensation,
there
is
a
topology
structure
of
PWM
main
circuit
and
nonpower
theory
on
active
filter
the
waves
technique
and
builds
flat
proof
on
the
ground of Saber Designer and proves to be practical. Meanwhile, it analyzes and designs the way
of non-power need of electric network tre- nds and decreasing line loss combined with DA, which
have been tested its objective economic benefit throu- gh counting example.
As
for
the
(DA)
trouble
measurement,
position,
isolation
and
resume,
This
dissertation
analyzes
the
changes
of
pressure
and
current
for
line
problem,
gets
math
equation
by
educing
phase
short
circuit
and
problem
position
under
the
condition
of
single-phase
and
works
out
equation and several parameter s U& , s I& and e I& table on problem . It brings out optimized
isolation and resume plan, realizes auto isolation and network reconstruction, reduces the power
off
range
and
time
and
improves
the
reliability
of
electric
power
supply
through
problem
self-
diagnoses and self- analysis. It also introduces software flow and use for problem judgement and
sets a model on network reconstruction and computer flow.
The distribution network is an important link among the power system. Its neutral grounding
mode and operation connects security and stability of the power system directly. At the same time,
the problem about neutral grounding is associated with national conditions, natural environment,
device fabrication and operation. For example, the activity situation of the thunder and lightning,
insulating structure and the peripheral interference will influence the choice of neutral grounding
mode
Conversely,
neutral
grounding
mode
affects
design,
operation,
debugs
and
developing.
Generally in the system higher in grade in the voltage, the insulating expenses account for more
sizable proportion at the total price of the equipment. It is very remarkable to bring the economic
benefits by reducing the insulating level. Usually such system adopt the neutral directly grounding
and
adopt
the
autoreclosing
to
guarantee
power
supply
reliability.
On
the
contrary,
the
system
which is lower in the voltage adopts neutral none grounding to raise power supply reliability. So it
is an important subject to make use of new- type earth device to apply to the distribution network
under considering the situation in such factors of various fields as power supply reliability, safety
factor, over-voltage factor, the choice of relay protection, investment cost, etc.
The neutral grounding mode of the network mainly adopts none grounding, grounding by arc
suppressing coil, grounding by reactance grounding and directly grounding. The best grounding
mode is confirmed through the technology comparison. It can help the network run in safety and
limit the earth electric arc by using auto-tracking compensate device and using the line protection
with the detection of the sensitive small ground current. With the comparison with technological
and
economy,
the
conclusion
is
drawn
that
the
improved
arc
suppressing
coil
grounding
mode
shows a very big development potential.
Combines
the
development
of
domestic
and
international
technology
and
innovative
achievement, and introduces the computer earth protection and autotracking compensate device. It
proves
that
the
improved
arc
suppressing
coil
grounding
mode
have
better
operation
characteristics
in
power
supply
reliability,
personal
security,
security
of
equipment
and
interference of communication.
As a result of the domination of the arc suppressing coil grounding mode, it should be more
popularized and applied in the distribution network in the future.




供配电系统


电力体制的改革引发了新一轮大规模的电力建设热潮从 而极大地推动了电力技术革命
新技术新设备的开发与应用日新月异特别是信息技术与电力技术的结合在很 大程度上提高