Planning
system (1) for planning an operating schedule (100, 100D) of a power
plant over a predetermined period of time, wherein the power
plant is capable of generating energy by driving an energy generator using a
turbine, and of executing any of an energy-selling operating mode which sells energy by operating the power
plant in a state in which the
turbine and the energy generator are connected, a zero-load operating mode which operates the power plant in a state in which the
turbine and the energy generator are not connected, and a stop operating mode which stops the turbine, wherein the planning
system (1) comprises: a determination unit (22) configured to determine whether a predicted energy selling price (Pe1, Pe2, Pe3) is higher than energy production costs (CP); and a planning unit (23) configured to calculate a loss index (J) for each of the energy selling operating mode, the zero-load operating mode, and the stop operating mode in the event that the predicted energy selling price (Pe1, Pe2, Pe3) is equal to or less than the energy production cost (CP) within the predetermined time period, using equation (1) based on an energy selling loss (J1) which is the difference between the expected energy selling price and the energy production cost (CP), a maintenance loss (J2), and an operating loss (J3) that does not contribute to an energy sale, and to schedule the operating plan (100, 100D) such that the power plant operates in an operating mode in which the loss index (J) is smallest, where the loss index (J) corresponds to the energy sales operating mode and includes the energy sales loss (J1) and the maintenance loss (J2), where the loss index (J) corresponds to the zero-load operating mode and the stop operating mode, respectively, includes the operating loss (J3) and the maintenance loss (J2), wherein the maintenance loss (J2) includes an
operating time loss which consumes a durability based on an
operating time of a component that configures the power plant, according to an accumulated
operating time of the power plant, and a frequency of a start loss which consumes a frequency based on the frequency of starting the component according to an accumulated frequency of starting the power plant, where the maintenance loss (J2) of each of the energy sales operating mode and the no-load operating mode has the operating
time loss as a major factor, where the maintenance loss (J2) of the stop mode has the frequency of a start loss as a major factor, and where the planning unit (23) is configured to: to determine the maintenance loss (J2) of each of the energy sales operating mode and the zero load operating mode using a first
weighting coefficient (k1); to determine the maintenance loss (J2) of the stop mode using a second
weighting coefficient (k2); to decrease the first
weighting coefficient (k1) and increase the second weighting coefficient (k2), or to decrease the first weighting coefficient (k1) and increase the second weighting coefficient (k2) if the ratio of the accumulated frequency of a start to the frequency of a start increases; and to increase the first weighting coefficient (k1), decrease the second weighting coefficient (k2), or to increase the first weighting coefficient (k1) and decrease the second weighting coefficient (k2) if the ratio of accumulated operating time to durability relative to operating time increases, wherein Loss index = Energy sales loss + Maintenance loss + Operating loss that does not contribute to energy sales