Power Converter Start-Up Selection for AC Supply Balance
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Solution Overview
Problem
In power conversion systems using modular multilevel converters (MMC), the start-up of power conversion devices can significantly impact the balance of electric power supply and demand in AC systems, especially when the AC systems have different power supply capabilities. Existing solutions do not adequately address the issue of minimizing the influence on AC systems during the start-up of power conversion devices.
Innovation Solution
A power conversion system with multiple power conversion devices connected to various AC systems, where a start-up device selects an AC system with the highest power supply capability based on system information and starts up the corresponding power conversion device, thereby minimizing the influence on the AC system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a power conversion device is started up from an AC system without sufficient power supply margin, then the power conversion device can be started up, but the balance between supply and demand of electric power cannot be maintained and the AC system is greatly influenced
Solution Approach 1:
The start-up device performs preliminary assessment of power supply capability for each AC system before initiating the start-up sequence. By evaluating system information in advance and selecting an appropriate AC system based on power supply margin, the invention prevents adverse effects on the AC system while ensuring successful start-up of the power conversion device
Data Source
AI summary
A power conversion system includes a plurality of power conversion devices connected to a plurality of AC systems, respectively. The power conversion devices are further connected to a common DC circuit. The power conversion system further includes a start-up device to start up each power conversion device. The start-up device selects an AC system that satisfies a defined condition relating to power supply capability from among the plurality of AC systems based on system information of the plurality of AC systems and starts up a power conversion device connected to the selected AC system.