Power Conversion Equipment
JPWO2026013876A1Active Publication Date: 2026-01-15MITSUBISHI ELECTRIC CORP
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Patent Information
- Application Number
- JP2024565355
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-07-12
- Publication Date
- 2026-01-15
- Estimated Expiration
- 2044-07-12
AI Technical Summary
Technical Problem
Existing power conversion devices using modular multilevel converters require high sampling frequencies and complex calculations to estimate capacitor capacitance, leading to increased processing load.
Method used
A power conversion device that includes a control device to estimate capacitor capacitance based on arm current, capacitor voltage, and power loss, using simplified calculations to reduce processing load.
Benefits of technology
The proposed solution reduces the processing load required for estimating capacitor capacitance, allowing for more efficient operation of power conversion devices.
✦ Generated by Eureka AI based on patent content.
Abstract
The power conversion device (100) includes a power converter (6) including a plurality of arms (13p, 13n) and a control device (5). Each of the plurality of arms (13p, 13n) has a plurality of converter cells (1) connected in cascade to one another, and each of the plurality of converter cells (1) has a plurality of switching elements (31p, 31n) and a capacitor (32). The control device (5) includes a power calculation unit (214) that calculates a capacitor flow-in power flowing into the capacitor (32) based on a voltage command value, an arm current, a capacitor voltage, and a power loss occurring in the converter cell (1), and a capacitance estimation unit (216) that estimates the capacitance of the capacitor (32) based on the capacitor flow-in power and the capacitor voltage.
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