POWER CONVERTER AND CONTROL METHOD THEREOF

Japanese Patent JP3892804

B2

PROBLEM TO BE SOLVED: To miniaturize a serial multiplex inverter where a plurality of single-phase cell inverters are connected in series on an output side by providing a smoothing capacitor between a forward converter that converts AC into DC and an inverter that converts DC into AC.
SOLUTION: The DC input current Idcu-Idcw of each single-phase inverter is calculated, and the current value is used to estimate variation ΔVdcu-ΔVdcw of the DC input voltage of each single-phase inverter for correcting output voltage command Vu*-Vw* of each phase of the inverter. The electric power supplied to a load from the smoothing capacitor by the single-phase inverter fluctuates by twice the AC output frequency. So, the input current and voltage of DC is easy to fluctuate much, and reducing the capacitance of the smoothing capacitor makes fluctuation of the DC voltage further large for easier occurrence of fluctuation in the torque of a dynamo electric motor. By estimating this without a DC voltage detecting means for effectively correcting a voltage command, the torque fluctuation is suppressed, resulting in a smaller power converter.

JP5734609	Inverter device and grid interconnection inverter system equipped with this inverter device
JP3053945	INDUSTRIAL APPLICABILITY: A control device for a neutral point clamp type power converter.
WO/2024/061449	A METHOD OF CONTROLLING A MODULAR MULTILEVEL CONVERTER

Yoshitoshi Akita
Toshiaki Okuyama
Shigetoshi Okamatsu
Keiji Kunii

JP2002373783A

March 14, 2007

December 25, 2002

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株式会社日立製作所

H02M7/483; H02M7/00; H02M7/48; H02M7/487; H02M7/49; (IPC1-7): H02M7/48

JP2001128459A
JP4087571A
JP2002101699A
JP9037559A
JP11069880A

Polaire Patent Business Corporation
Katsuo Ogawa
Kyosuke Tanaka
Takashi Sasaki

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