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Patent Agency Ranking
公开(公告)号：US09692243B2
公开(公告)日：2017-06-27
申请号：US14440925
申请日：2013-11-19
Inventor： Mitsuru Kaji , Kenichi Watanabe , Hoday Stearns
CPC classification number: H02J7/0068 , H02J3/32 , H02J13/0006 , Y02E60/722 , Y04S10/14
Abstract: Provided is a frequency regulation method for regulating a frequency of a power system so that the frequency approximates to a rated frequency, the method including: measuring the frequency; obtaining an SOC (state of charge) of a storage battery; determining a base-point of power to be charged in or discharged from the storage battery when the measured frequency is equal to a predetermined rated frequency; determining a control variable changed from the base-point by an amount corresponding to a frequency deviation that is a difference between the predetermined rated frequency and the measured frequency; and charging or discharging the storage battery based on the control variable, wherein in the determining a base-point, a third rate of change is smaller than a first rate of change and a second rate of change that are average rates of change in the base-point with respect to the SOC when the SOC is within a first range and a second range, respectively.
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公开(公告)号：US10067493B2
公开(公告)日：2018-09-04
申请号：US14781114
申请日：2014-02-26
Inventor： Hoday Stearns , Kenichi Watanabe , Mitsuru Kaji
Abstract: A frequency control method for use in a frequency control system including: a server that receives, from a power system operator, a power command for controlling a frequency of a power grid within a predetermined frequency; at least one distributed energy resource; and a local controller connected to the server through a communication network and to the at least one distributed energy resource, the frequency control method includes: receiving the power command from the power system operator; obtaining a frequency measurement of the power grid; predicting a next power command using the frequency measurement, before the next power command is received from the power system operator; and controlling an input or output of the at least one distributed power energy resource using the predicted next power command, before the next power command is received from the power system operator.
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公开(公告)号：US09787123B2
公开(公告)日：2017-10-10
申请号：US14848246
申请日：2015-09-08
Inventor： Mitsuru Kaji
CPC classification number: H02J7/007 , H01M10/44 , H01M10/446 , H02J3/14 , H02J3/32
Abstract: A charge/discharge control device according to an aspect of the present disclosure is equipped with a system frequency measurer 303 that measures a system frequency, a base frequency updater 304 that updates a base frequency, a frequency bias calculator 305 that calculates a frequency bias indicating the difference between the base frequency and the system frequency, a charge/discharge command value decider 306 that uses the frequency bias to decide a power command value, and a charge/discharge controller 307 that causes a power storage system to charge/discharge power. The base frequency updater 304 determines whether or not reverse operation will occur, and in the case of determining that reverse operation will not occur, updates the base frequency so that the base frequency matches a frequency obtained by applying a low-pass filter to a temporal variation of the system frequency, while in the case of determining that reverse operation will occur, updates the base frequency so that the base frequency matches the system frequency.
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公开(公告)号：US11329471B2
公开(公告)日：2022-05-10
申请号：US16757846
申请日：2018-09-21
Inventor： Tatsuo Koga , Atsushi Okita , Mitsuru Kaji
Abstract: An arc detection circuit includes a current detector and arc determination unit. The current detector detects a current flowing through a transmission line which connects an electric power supply device and an electric power conversion circuit. The arc determination unit calculates, from a result of measurement of the current, an area of interest and an area for comparison. The area of interest is an area of a region of interest defined by a predetermined frequency range and predetermined time for determination. The area for comparison is an area of a portion in which detected strength exceeds a predetermined strength threshold in the region of interest. The arc determination unit determines an electric arc has occurred when a ratio between the area of interest and the area for comparison exceeds a predetermined area-ratio threshold.
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5.发明授权公开(公告)号：US09685799B2
公开(公告)日：2017-06-20
申请号：US14777631
申请日：2014-03-14
Inventor： Mitsuru Kaji , Tzen Woo Tham
CPC classification number: H02J7/0029 , H02J3/24 , H02J3/32 , H02J7/007 , H02J2007/0037 , H02J2007/004
Abstract: A storage battery controller includes a charging/discharging rate setter which sets a rate at which the battery is charged/discharged to approximate the power system frequency to rated frequency; and a charge and discharge controller which controls charge and discharge of the battery, in which the gain adjuster: when the measured charge level is lower than a lower limit of a normal range and the obtained power system frequency is within a first non-sensitive zone ranging from a first frequency lower than the rated frequency to the rated frequency, decreases the charging rate to a predetermined percentage of the charging rate; and when the measured frequency is higher than an upper limit of the normal range and the obtained power system frequency is within a second non-sensitive zone ranging from a second frequency higher than the rated frequency to the rated frequency, adjusts the discharging rate to decrease the discharging rate.
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