Civil Engineering Reference
In-Depth Information
Electricity-driven operating mode
For this operating mode, the electrical power demand is the control variable of
the power output from the CHP unit. In principal there are two possible oper-
ating modes:
-
working in parallel with other systems; the CHP unit supplies the consumers
until it reaches its maximum electrical output.
-
working independently; the CHP unit (very often in combination with a
battery system) has to cover its own consumers
'
demand.
by taking additional measures, the CHP unit may also be used as stand-by
power supplying system.
The thermal energy, which is produced simultaneously by the CHP unit, should
be used as well as possible. When it is appropriate, the heat storage tanks or
other capacities may be used for heat storage.
-
Combined operating modes
It is also possible to apply combined operating modes, for example:
Heat-driven with peak-electricity function,
Maximum electricity and/or heat demand,
Minimum electricity and/or heat demand.
3.2 Control Strategy of the CCHP System
Designing the control system needs an analysis of all the elements that in
uence the
performance level indicators of the mCCHP system: the thermal and electrical
energy sources production, the loads which occur in summer and winter regime, as
well as the state of the main thermal and electrical battery sources.
In a larger frame, this analysis is useful for achieving the following mutually
dependent objectives:
to establish the potential solutions set regarding the structure of a mCCHP
system based on renewable energy sources and designed for
residential
consumers;
to establish the potential solutions set regarding the system control, all these
being viable from the point of view of the steady-state regime performances; and
to analyze the system
s operating through modeling and numerical simulation in
dynamic regime. The purpose of this analysis is the functional design of the
system, based on comparative evaluations, when a certain working solution is
applied associated to a certain control solution.
'
In order to achieve these objectives, the modeling and numerical simulation of
the mCCHP system is based on the aspects below mentioned.
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