CONTROL DEVICE AND POWER CONVERSION DEVICE

WIPO Patent Application WO/2024/075212

A1

Provided is a control device in a power conversion device for photovoltaic power generation connected with solar panels at a DC side, wherein the control device comprises: a modulation rate calculation unit which calculates a modulation rate on the basis of a DC voltage of the DC side of the power conversion device and a system voltage RMS value of an AC side of the power conversion device; a limiter adjustment unit which calculates a lower limit limiter operation value on the basis of a prescribed lower limiter setting value, the system voltage RMS value, and a prescribed rated value in response to the modulation rate calculated by the modulation rate calculation unit; a limiter which updates a DC voltage command lower limit limiter on the basis of the lower limit limiter operation value calculated by the limiter adjustment unit; a maximum power point follow-up control unit which performs a maximum power point follow-up control on the basis of DC power generated by the solar panels to calculate a first DC voltage command value, and determines a second DC voltage command value on the basis of the calculated first DC voltage command value and the DC voltage command lower limit limiter set in the limiter; and an inverter control unit which controls an inverter in the power conversion device on the basis of the second DC voltage command value determined by the maximum power point follow-up control unit.

KATSUKURA TOMOYA (JP)
TAWADA YOSHIHIRO (JP)
FUKASAWA ISSEI (JP)
KINOSHITA MASAHIRO (JP)

PCT/JP2022/037267

April 11, 2024

October 05, 2022

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TOSHIBA MITSUBISHI ELECTRIC INDUSTRIAL SYSTEMS CORP (JP)

H02M7/48; G05F1/67

TAKADA, TAKAHASHI & PARTNERS (JP)

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