Battery system and its control method

摘要

A battery system includes a battery, a control section that controls the battery to charge electric power supplied from the electrical grid and to discharge electric power to the electrical grid; and a system controller. The system controller controls the control section such that the battery system operates in a first mode where electric power that is generated by a pre-designated distributed electric power source associated with the electrical grid is supplied preferentially to a user's load or in a second mode where electric power that is charged in the battery is supplied preferentially to the user's load.

主权项

1. A battery system that is operable in association with an electrical grid, the battery system comprising:
a battery that charges or discharges electric power; a control section that controls said battery to charge electric power supplied from said electrical grid and to discharge electric power to said electrical grid; a system controller that controls said control section such that said battery system operates in a first mode where electric power that is generated by a pre-designated distributed electric power source associated with said electrical grid is supplied preferentially to a user's load or in a second mode where electric power that is charged in said battery is supplied preferentially to said user's load; and first electric power measurement means that measures electric power supplied to said user's load on said electrical grid side rather than an association point of said distributed electric power source, wherein said system controller controls said control section such that said battery discharges electric power to said electrical grid if electric power measured by said first electric power measurement means is greater than 0 while said battery system is operating in said first mode.