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公开(公告)号：US20230369956A1
公开(公告)日：2023-11-16
申请号：US18246171
申请日：2020-09-29
Applicant: Mitsubishi Electric Corporation
Inventor： Fuminori NAKAMURA , Takeshi KIKUCHI , Daisuke YAMANAKA
CPC classification number: H02M1/0003 , H02M7/48 , H02M7/12
Abstract: A power conversion device includes a self-commutated power converter that performs power conversion between an AC circuit and a DC circuit, and a control device that controls switching operation of a switching element included in the self-commutated power converter. The control device calculates a deviation between a control command value for the self-commutated power converter and a feedback value from the self-commutated power converter, and performs first control to increase a switching frequency of the switching element when the deviation becomes equal to or greater than a first threshold value.
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公开(公告)号：US20220337173A1
公开(公告)日：2022-10-20
申请号：US17635415
申请日：2019-09-09
Applicant: Mitsubishi Electric Corporation
Inventor： Fuminori NAKAMURA , Takeshi KIKUCHI , Daisuke YAMANAKA , Takuya KAJIYAMA , Toshiyuki FUJII
Abstract: In an MMC-based power conversion device, a control device generates, for each leg circuit, a first voltage command value not based on circulating current circulating between a plurality of leg circuits and a second voltage command value based on the circulating current. A plurality of individual controllers are provided respectively corresponding to a plurality of converter cells and generate a gate control signal for controlling turning on and off of a switching element of the corresponding converter cell, based on the first voltage command value and the second voltage command value. When generating the gate control signal using pulse width modulation, each individual controller modulates a carrier signal in accordance with the second voltage command value such that the pulse width of the gate control signal changes in accordance with the second voltage command value.
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