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公开(公告)号：US20240297597A1
公开(公告)日：2024-09-05
申请号：US18697911
申请日：2021-10-07
发明人： Kaho MUKUNOKI , Toshiyuki FUJII , Ryosuke UDA , Kota HAMANAKA , Shuhei FUJIWARA
IPC分类号： H02M7/5387
CPC分类号： H02M7/53871
摘要： A current suppression control unit calculates correction terms of reference voltage command values for operating a power converter as a voltage source. The correction terms are calculated to compensate for respective current deviations of output currents transformed on two axes, with respect to current command values on a two-axis rotating coordinate system for suppressing an output current of the power converter to less than or equal to a control upper limit value. A proportional control unit has proportional elements to reflect the current deviations in the correction terms within the same axes of the two axes. A decoupling control unit has integral elements to reflect the current deviations in the correction terms between the different two axes.
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公开(公告)号：US20240146066A1
公开(公告)日：2024-05-02
申请号：US18557342
申请日：2021-06-01
发明人： Frederick PAGE , Yoshiyuki KONO , Kazuyori TAHATA , Shuhei FUJIWARA , Shinji TOMINAGA , Masatoshi TAKEDA
摘要： In a power grid stabilization system, a second energy storage system has a larger energy storage capacity than a first energy storage system. A bidirectional AC/DC converter is connected between an AC power grid and a pair of input and output terminals of the first energy storage system. A first bidirectional DC/DC converter is connected between the pair of input and output terminals of the first energy storage system and a pair of input and output terminals of the second energy storage system.
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公开(公告)号：US20220393616A1
公开(公告)日：2022-12-08
申请号：US17774990
申请日：2019-12-02
发明人： Shuhei FUJIWARA , Yoshiyuki KONO , Ryosuke UDA , Takuya KAJIYAMA , Toshiyuki FUJII , Shigeo HAYASHI
IPC分类号： H02M7/5395 , H02M1/00 , H02M7/483
摘要： A voltage evaluation value generator receives voltage detection values of power storage elements of all of converter cells included in a power converter and generates a first voltage evaluation value of each power storage element of all of the converter cells and a second voltage evaluation value of each power storage element in a plurality of converter cells included in each of a plurality of groups obtained by classifying all of the converter cells in advance, without using a mean value of voltage detection values. A voltage macro controller uses the voltage evaluation value to calculate a control value set in common to at least the converter cells in the same group for controlling deficiency and excess of stored energy in all of the converter cells and the converter cells in each group.
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公开(公告)号：US20210099102A1
公开(公告)日：2021-04-01
申请号：US16500143
申请日：2017-05-26
摘要： A power conversion device includes power conversion circuitry including a plurality of submodules connected in series to each other. The power conversion device further includes: a signal reception unit configured to receive a signal representing a voltage of a capacitor in each of the submodules; a time calculation unit configured to calculate at least one of a charging time of the capacitor and a discharging time of the capacitor based on the signal; and a determination unit configured to determine whether the capacitor has degraded or not based on at least one of a first result of comparison of the charging time with a reference charging time serving as a reference for determining degradation of the capacitor, and a second result of comparison of the discharging time with a reference discharging time serving as a reference for determining degradation of the capacitor.
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公开(公告)号：US20240154519A1
公开(公告)日：2024-05-09
申请号：US18549662
申请日：2021-03-19
发明人： Shuhei FUJIWARA , Ryosuke UDA , Yoshiyuki KONO
摘要： A control device includes a power generator simulation unit to generate a voltage command value, and a signal generation unit to generate a control signal for the power converter. The power generator simulation unit includes a first integrator to time-integrate a first difference between effective power and a target value of the effective power and output a first angular frequency, a second integrator to time-integrate the first angular frequency and output a phase of an AC voltage, and a voltage command generation unit to generate the voltage command value based on the AC voltage, a target value of the AC voltage, and the phase. When a voltage difference between the AC voltage and the target value of the AC voltage is greater than a threshold, the first integrator outputs a difference between an angular frequency of the AC voltage and a reference angle frequency as the first angular frequency.
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公开(公告)号：US20240022183A1
公开(公告)日：2024-01-18
申请号：US18254584
申请日：2020-12-09
IPC分类号： H02M7/5395 , H02M7/483 , H02M1/00
CPC分类号： H02M7/5395 , H02M7/4835 , H02M1/0054 , H02M1/0012
摘要： A power conversion device includes a power converter including a plurality of arms each having a plurality of converter cells cascaded to each other. A control device includes an AC current controller to control AC current flowing between the power converter and an AC circuit and a circulating current controller to control circulating current flowing between the arms of the power converter. The AC current controller reduces an effective value or amplitude value of AC current in a discharge operation mode in which a voltage of a power storage element of each converter cell is discharged, compared with in a normal operation mode. The circulating current controller increases an effective value or amplitude value of circulating current in the discharge operation mode, compared with in the normal operation mode.
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公开(公告)号：US20220200475A1
公开(公告)日：2022-06-23
申请号：US17603471
申请日：2019-04-25
发明人： Ryosuke UDA , Takeshi KIKUCHI , Shuhei FUJIWARA , Yoshiyuki KONO
摘要： A control device includes: a phase error calculation unit to calculate a phase error between a phase of a voltage command for the power converter and a phase of a point-of-interconnection voltage; and an isolated system determination unit to determine whether the AC power system has shifted from an interconnected system to an isolated system, based on the phase error and a magnitude of the point-of-interconnection voltage, the interconnected system being the AC power system connected to a generator, the isolated system being the AC power system not connected to the generator. The isolated system determination unit determines that the AC power system has shifted from the interconnected system to the isolated system, when at least a first condition is met that the phase error is outside a reference range and the magnitude of the point-of-interconnection voltage is greater than a first voltage threshold.
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公开(公告)号：US20220029524A1
公开(公告)日：2022-01-27
申请号：US17292905
申请日：2018-12-25
IPC分类号： H02M1/12 , H02M7/49 , H02M1/32 , H02M7/5387
摘要： A power converter includes an arm in which a plurality of converter cells are connected in series, each of the converter cells including at least two switching elements, a power storage element, and a pair of output terminals. A control device controls the power converter. The converter cell includes a switch to have the converter cell bypassed. When the control device senses failure of the converter cell, it has the failed converter cell within the arm bypassed and controls a normal converter cell within the arm to suppress a ratio of a harmonic component in an arm current that increases due to the failure.
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公开(公告)号：US20230147142A1
公开(公告)日：2023-05-11
申请号：US17919703
申请日：2020-06-17
CPC分类号： H02M7/12 , H02M1/0067 , H02J3/001 , H02M1/4208 , H02M1/32
摘要： A power conversion system includes: a first power converter to perform power conversion between a first AC system and a DC circuit; and a second power converter to perform power conversion between a second AC system and the DC circuit. Each of the first power converter and the second power converter includes a plurality of submodules connected in series. Each of the plurality of submodules includes a plurality of switching elements and a capacitor. A first fundamental frequency of the first AC system is greater than a second fundamental frequency of the second AC system. A first average voltage value of a capacitor in a first submodule included in the first power converter is larger than a second average voltage value of a capacitor in a second submodule included in the second power converter.
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公开(公告)号：US20230056080A1
公开(公告)日：2023-02-23
申请号：US17797272
申请日：2020-03-11
摘要： A power conversion device includes a power conversion circuit unit including a plurality of leg circuits. Each of the leg circuits includes a plurality of converter cells each having a capacitor and connected in series to each other. Each of the plurality of converter cells is a first converter cell including at least two switching elements or a second converter cell including at least four switching elements. The power conversion device further includes a control device. The control device operates the plurality of the first converter cells that are controlled not based on a circulating current circulating between the plurality of leg circuits as a voltage source that outputs a circulating voltage in a circulation circuit indicating a closed circuit that does not include a DC circuit and an AC circuit, and operates the plurality of the second converter cells to control the circulating current in the circulation circuit.
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