Present software package is designed to solve the problems
connected with the power-fuel system network's optimal work and
its stability with respect to probable disturbances. The used
model can also be used to analyze the economic problems,
concerning the PFSN work, e.g. the dependence of its functional
parameters upon the rate and balance of prices of the processes
in the system.
Model of Network
The model of network is based on the generalized PFSN
scheme, including elements of four types: consumers, sources,
stores and delivery arteries. It allows to consider time-variant
characteristics of the system and time-distributed disruptions.
The dynamics of the system's state: redistribution of energy
resources flows, the stores creation and use - can be also
described.
The consumer in the model represents a set of users of
different resources, located in a certain economic region. The
sources of fuel (oil, gas and coal) and electric power (heat,
hydro and nuclear power stations) are described. The system is
supposed to include the stores of any kind of resources. The fuel
and power delivery systems in the model correspond to the net of
main arteries of the real transportation system of every type of
resources.
A cost function is considered in connection with any of the
processes in the power-fuel system network (that are the energy
resources extraction or working out, transportation, converting,
storage and consumption).
The set of cost functions allows to express three purposes
associated with the construction and use of the PFSN. They are:
to increase the rate of consumers demand
satisfaction;
to reduce the system's failurability level;
to maintain the economical regime, i.e. use of
the shortest paths for delivery, etc.
The cost functions represent the cost of the processes and
the penalty for the approach of the process to the critical or
failurable regime. A special cost function evaluates the rate of
the consumers provision. The model operates with the notion of
consumption categories, i.e. it's supposed that the amounts of
the resources are fixed, that should be delivered to the
consumers to satisfy the demand of the first, second, etc.,
urgency. The more urgent is the unsatisfied category the higher
is the penalty, expressed by the cost function. The consumption
categories represent in fact the amount of resource needed to
provide different groups of users, that are classified by their
technological position.
Distubances
The PFSN functionality can be disturbed by various
disruptions (outer interferences or failure and malfunction of
certain elements and fragments of the network). It's supposed
that the available information about the disturbances is not
precise, but generalized (for example, the general power of the
blow). Under these conditions the stability of the system is
described by the guaranteed quality of its work.
Performance of researches
A complex of computer programs based on the described PFSN
model is created in the department. It allows the researcher to
set in the model, as the initial data, the system's geographical
configuration, technical characteristics of its elements,
parameters of the cost and penalty functions, the data or
prognosis on the possible damages of the system and its restore.
The program complex forms the network model of the
power-fuel system network with the external influences and the
temporal variations. Then the calculation is fulfilled optimizing
the system's work with respect to the introduced quality
criterion (that is the combination of the cost functions). As the
result one can obtain the optimal distribution of the energy
resource flows and strategy of the stores dynamics and system
reparation (if one needed), the data on the consumers supply and
the level of failurability of the system elements.
The researcher can vary the parameters of the system damage
and find the most harmful type of destruction. While searching
for the worst variant of the destruction the elements of the net
can be found that put the limit to the system's possibilities.
These elements should be strengthened first of all to improve the
system's stability.
The cost functions can be interpreted as the values of the
processes in common economic meaning. Then the researcher can
analyze the effect of the costs variation on the PFSN functional
parameters.
Hardware requirements:
IBM-compatible personal computer XT/AT with follows type of monitor : EGA, VGA, MCGA
or SVGA;
Any printer for getting hard copies;
Microsoft - compatible mouse;
Operational system MS-DOS version 3.0 or higher, Windows 95, Windows 98, Windows 2000 and futher;