Power Conversion Device

Abstract

The power conversion device (100) includes a power converter (6), a control device (50), and a plurality of relay devices (30). The control device (50) transmits a communication frame (61) to the plurality of relay devices (30) via a ring-shaped network (510). Each of the plurality of relay devices (30) receives the communication frame (61) including first information on the number of relay devices (30) through which the communication frame (61) passes before reaching the own relay device (30), second information indicating the maximum number indicated by the first information, and a control command for controlling the plurality of converter cells (1), adjusts the transmission timing of the control command in the own relay device (30) based on the first information and the second information so that the control commands are transmitted simultaneously from the plurality of relay devices (30), and transmits the control command to one or more converter cells (1) connected to the own relay device (30) according to the adjusted transmission timing.

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