US 11,799,302 B2
Power conversion system
Yoshinori Tsuruma, Tokyo (JP)
Assigned to TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION, Chuo-ku (JP)
Appl. No. 16/972,274
Filed by TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION, Chuo-ku (JP)
PCT Filed May 29, 2019, PCT No. PCT/JP2019/021378
§ 371(c)(1), (2) Date Dec. 4, 2020,
PCT Pub. No. WO2020/240742, PCT Pub. Date Dec. 3, 2020.
Prior Publication US 2022/0115888 A1, Apr. 14, 2022
Int. Cl. H02J 7/00 (2006.01); H02M 7/04 (2006.01)
CPC H02J 7/00306 (2020.01) [H02J 7/0048 (2020.01); H02M 7/043 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A power conversion system comprising:
a power conversion circuit having a DC side connected to a storage battery and having an AC side connected to an AC power source via an interconnection inductance;
a power conversion control circuit having a charging control mode for controlling the power conversion circuit to take in power from a side of the interconnection inductance to the storage battery via the power conversion circuit; and
a command value generating part configured to generate a command value for executing the charging control mode,
wherein the charging control mode included in the power conversion control circuit is a mode for controlling an output voltage of the power conversion circuit such that an interconnection inductance voltage is applied to the interconnection inductance, and the interconnection inductance voltage is determined by a power supply voltage vector of the AC power supply and a voltage command value vector having a delay phase with respect to the power supply voltage vector and having a magnitude and a phase based on the command value,
wherein the command value generating part generates a first command value for an operation of the charging control mode when a voltage of the storage battery is not lower than a predetermined over-discharge threshold value, and generates a second command value for an operation of the charging control mode when the voltage of the storage battery is lower than the over-discharge threshold value,
wherein the first command value is a command value for causing the power conversion circuit to output an output voltage corresponding to a first voltage command value vector having a first magnitude and a first delay phase, and
wherein the second command value is a command value for causing the power conversion circuit to output an output voltage corresponding to a second voltage command value vector having a second magnitude smaller than the first magnitude.