Patent ID: 9727929
Date: 2017-08-08
CPC Classifications: G06Q

Claim:
1. An energy management system which manages energy of a home, comprising: processing circuitry configured as: an energy demand estimator configured to estimate an energy demand of the home to obtain an estimated value of the energy demand; a power generation estimator configured to estimate a generation amount of energy of an energy generator of the home to obtain an estimated value of the generation amount; and a preparer configured to prepare a discharge strategy capable of maximizing a balance between a power selling profit and a power purchase loss by using a push-up effect, and a controller configured to control discharge of an energy storage apparatus, based on an actual value of the energy demand, an actual value of the generation amount, and the discharge strategy, wherein the push-up effect is an effect to increase a power selling amount derived from the energy generator by covering the energy demand with discharge of the energy storage apparatus; the preparer is further configured to: calculate an estimated value of a discharge value for each of unit periods in a standard period of time, the estimating value of the discharge value being a sum of a cancel amount of the power purchase loss in case where the estimated energy demand is covered with discharge of the energy storage apparatus and a power purchase profit based on the estimated generation amount; calculate an estimated value of a discharge value rate, which is a value obtained by dividing the estimated value of the discharge value by the discharge amount of the energy storage apparatus, for each of the unit periods; prepare a discharge strategy to distribute the discharge amount of the energy storage apparatus to the respective unit periods, in descending order of estimated values of the discharge value rate; specify a unit period at which a total of the estimated values of the energy demand becomes equal to or larger than the total discharge amount of the energy storage apparatus, the total being obtained by successively adding the estimated values of the energy demand from a unit period with a highest estimated value of the discharge value rate; and determine an estimated value of the discharge value rate in the specified unit period as a threshold, and the controller is further configured to: calculate an actual value of the discharge value rate, which is obtained by dividing the discharge amount into a sum of a cancel amount of the power purchase loss in case where the actual value of the energy demand is covered with discharge of the energy storage apparatus and a power selling profit based on the actual value of the generation amount; and discharge the energy storage apparatus when the actual value of the discharge value rate is equal to or larger than the threshold.