Electric power system and electric power calculation method

An electric power calculation method of calculating, in an electric power system including a vehicle, a charging stand, and a server, an amount of electric power transferred by the vehicle,

• the vehicle being configured to perform
• external charging of charging a battery with electric power supplied from outside the vehicle, and
• external discharging of supplying electric power of the battery to outside the vehicle,
• the charging stand being configured to transfer electric power between an AC power supply outside the vehicle and the vehicle in the external charging and the external discharging,
• the server being configured to communicate with the vehicle and the charging stand,
• in the external charging and the external discharging, when electric power transferred between the vehicle and the charging stand is AC power, the vehicle including
• a first charger that converts AC power supplied from the charging stand into DC power and converts DC power supplied from the battery into AC power, and
• a first detector that detects electric power input to and output from the first charger,
• the electric power calculation method comprising:
• measuring, by the vehicle, charging power supplied from the charging stand or discharging power supplied to the charging stand using a detection value of the first detector;
• and
• transmitting, by the vehicle to the server, a first measurement value that is a result of the measurement, and
• in the external charging and the external discharging, when electric power transferred between the vehicle and the charging stand is DC power,
• the charging stand including
• a second charger that converts AC power supplied from the AC power supply into DC power and converts DC power supplied from the vehicle into AC power, and
• a second detector that detects electric power input to and output from the second charger, and
• the electric power calculation method further comprising:
• measuring, by the charging stand, charging power supplied to the vehicle or discharging power supplied from the vehicle using a detection value of the second detector;
• and
• transmitting, by the charging stand to the server, a second measurement value that is a result of the measurement.

An electric power system comprising:

• a vehicle that performs
• external charging of charging a battery with electric power supplied from outside the vehicle, and
• external discharging of supplying electric power of the battery to outside the vehicle,
• a charging stand that transfers electric power between an AC power supply outside the vehicle and the vehicle in the external charging and the external discharging;
• and
• a server that communicates with the charging stand, wherein
• in the external charging and the external discharging, when electric power transferred between the vehicle and the charging stand is AC power,
• the charging stand includes a first detector that detects charging power supplied to the vehicle and discharging power supplied from the vehicle, and
• the charging stand measures the charging power or the discharging power using a detection value of the first detector, and transmits, to the server, a first measurement value that is a result of the measurement, and
• in the external charging and the external discharging, when the electric power transferred between the vehicle and the charging stand is DC power,
• the charging stand includes
• a charger that converts AC power supplied from the AC power supply into DC power and converts DC power supplied from the vehicle into AC power, and
• a second detector that detects electric power input to and output from the charger, and
• the charging stand measures charging power supplied to the vehicle or discharging power supplied from the vehicle using a detection value of the second detector, and transmits, to the server, a second measurement value that is a result of the measurement.