2.Problem Formulation
In order to diversify the generation requirements, four types of
generators with different parameters are considered in this study. These
four types of generators feature different generation cost and operation
characteristics. Particularly, each type of generator features maximum
output power constraints. When being connected into the grid, their
output power features various minimum power level. Meanwhile, each
generator features a starting cost, which is used to limit the on/off
times. When each generator is operated with minimum output power, each
of them features a fixed hourly rate. When the output power is higher
than the minimum output power, the marginal cost should be considered,
as introduced above.
In order to simplify the proposed problem to some extent, it is assumed
that the start point appears at the beginning of each time interval.
Meanwhile, compared to the generation cost of each generator, the
shut-down cost is much lower. Hence, the shutting down cost is
eliminated here. In order to ensure the reliable operation of
generators, sufficient generation margin should be guaranteed with
respect to the maximum allowable generation power. Here, it is set that
the surplus generation cost is set to 30% of the maximum demand
requirements. This is involved to avoid the reliability and stability
issues induced by sudden load change.
It is assumed that the load demand follows the chart in Fig. 1. The
detailed load data is shown in Table 1. Meanwhile, the generation
parameters of each generator are summarized in Table 2. The data shown
in Table 1 and Table 2 will be used in the following analysis.
Meanwhile, system parameters are listed in Table 3.