Electric energy storage device and installation-operation method thereof
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United States of America Patent
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Apr 12, 2016
Grant Date -
Mar 13, 2014
app pub date -
Feb 14, 2012
filing date -
Feb 14, 2011
priority date (Note) -
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Abstract
Frequent charging/discharging to an electric energy storage element is suppressed for energy saving and longer lifetime. A transmission-line-side power converter device converts power from a transmission line, and supplies DC power to a feeder line connected to an electric energy storage element. An output current controller connected with a line voltage detector detects the feeder line voltage, and a charging rate detector detects a charging rate of the electric energy storage element. A control table sets charging/discharging start voltages and current saturated voltages based on the detected line voltage and charging rate. The output current controller controls the electric energy storage element to discharge at a high line voltage as the charging rate increase, to suppress charging the electric energy storage element at the low line voltage, and makes discharging difficult at the low line voltage to facilitate charging at the low line voltage as the charging rate decreases.
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