Patent ID: 9698610
Date: 2017-07-04
CPC Classifications: H02J

Claim:
1. A method of controlling a power storage apparatus connected to a grid for power system stabilization control, based on a performance score indicating responsiveness of the charge or discharge to a power instruction value, the method comprising: receiving, in a period of a stabilization control, a power instruction value indicating a power value which the power storage apparatus is to charge or discharge; obtaining a remaining state of charge (SOC) of the power storage apparatus; and controlling charge or discharge of the power storage apparatus according to the power instruction value, when the power instruction value is received, wherein the performance score is represented by a weighted sum of each of a degree of delay, a degree of correlation, and a degree of precision, the each of the degree of delay, the degree of correlation, and the degree of precision being between a power value indicated by the power instruction value and a power value of power charged or discharged from the power storage apparatus according to the power instruction value, and wherein the charge or discharge of the power storage apparatus are further controlled based on a weight of the performance score, according to one control method selected from among a first control method, a second control method, and a third control method, wherein in the first control method, a delay time is determined according to a difference between a target SOC and the remaining SOC, the delay time being from when the power instruction value is received to when the power storage apparatus is caused to charge or discharge according to the power instruction value, (i) when the remaining SOC is smaller than the target SOC, the delay time is set, in a period in which the power instruction value increases as time passes, from when the power instruction value is received to when the power storage apparatus is caused to charge or discharge according to the power instruction value, and (ii) when the remaining SOC is larger than the target SOC, the delay time is set, in a period in which the power instruction value decreases as time passes, from when the power instruction value is received to when the power storage apparatus is caused to charge or discharge according to the power instruction value, in the second control method, an offset is added to the power instruction value according to a difference between the target SOC and the remaining SOC, and (i) when the remaining SOC is smaller than the target SOC, the offset gets larger as an absolute value of a charge power value indicated by the power instruction value becomes smaller, and (ii) when the remaining SOC is larger than the target SOC, the offset gets larger as an absolute value of a discharge power value indicated by the power instruction value becomes smaller, and in the third control method, a stop time is determined according to a difference between the target SOC and the remaining SOC, (i) stopping charge or discharge of the power storage apparatus for the stop time in a predetermined period, when the remaining SOC is smaller than the target SOC, in a period in which the power instruction value indicates discharge, and (ii) stopping charge or discharge of the power storage apparatus for the stop time in the predetermined period, when the remaining SOC is larger than the target SOC, in a period in which the power instruction value indicates charge.