Diesel Generator Parallel Operation
by Starlight Generator dieselgeneratortechThe function
of parallel operation between diesel generator set
Improve the reliability and
continuity of power supply system. Since multiple generator sets are connected
into a single grid, the voltage and frequency of the power supply are stable
and can withstand the shock of large load variation.
Maintenance. Maintenance is more
convenient. Multiple units in parallel use, can centralized dispatch,
distribution of active and reactive load, can make maintenance, maintenance
convenient and timely.
More economical. According to the
size of the load on the network, a suitable number of small power units can be
put in order to reduce the fuel oil and oil waste caused by the small load
operation of the large power unit.
Future expansion is more
flexible. We only need to install the power generation and parallel equipment,
and when the company needs to expand the power network capacity, we can add the
generating units, and can easily realize the expansion of the unit, so that the
initial investment is more economical.
Once the external power supply is
interrupted, the diesel generator set should be started automatically to play
the role of emergency power supply. What are the three starting modes of diesel
generator set in automatic mode?
Boot
according to demand
In automatic mode, when the
on-off input port is effective, the module with the highest priority starts
first. When the load is greater than the maximum percentage set by the module,
the sub-priority module starts up and synchronizes. Average load distribution.
When the load is less than the
minimum percentage of the downtime set by the module, when the sub-priority
module is delayed, the switch and heat dissipation stop.
The sub-priority module is turned
on when the load generating set is shut down.
Full boot
In the automatic mode, when the
on-off input port is effective, all the modules are turned on, first the module
with load condition is closed first, and the other modules, after the load
condition is reached, synchronize one by one. Then the module detects the load,
and when the load is less than the minimum percentage of the downtime set by
the module, the module with small priority is delayed, and the switch and heat
dissipation stop.
When the load is greater than the
maximum percentage set by the module, all the remaining unpowered generating
units are automatically turned on.
When the load generating set is
stopped, all the remaining unturned-on generating units are automatically
turned on.
Balanced
engine running time
In automatic mode, the generator
set with small engine running time will start up first when the switch input
port is remotely started with load (according to demand).
When the operating time of the
generating set with load is longer than that of the equalized engine set by
other generating units, the other units are scheduled to start up (can start
according to the demand, all the two modes), and the other units synchronize
and merge. Open and unload your own downtime.
All generators turn on and off in
turn according to the running time of the equalization engine.
When a diesel generator works in
parallel, it often occurs that the load current cannot be balanced
distribution, or that the current and power oscillate periodically, which
results in the instability of rotational speed, voltage and path. That is, the
generator can not work in parallel stably. For such problems, electricians tend
to think that they are caused by mechanical causes of diesel engines, while
crew members think that they are caused by electrical equipment. And both
parties can prove that the relevant part of each unit is normal in performance.
In this way, the problem is difficult to solve because of the lack of clear
analysis of the fault cause and the mutual prevarication. It should be pointed
out that the mechanical and electrical properties of most diesel generators
with poor parallel performance are good when they are operated separately. This
show that the problem is caused by the establishment of a certain relationship
after the parallel connection of the generator set. Therefore, when analyzing
these problems, we must start with the cooperation of the characteristics and
parameters of the parallel gensets. All the same time, the factors that affect
the parallel operation of generator sets are often ignored or considered
irrelevant when the gensets are used separately.
Sponsor Ads
Created on Nov 3rd 2018 02:09. Viewed 441 times.