Modular Converter Error Reporting via Message Comparison
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Solution Overview
Problem
In modular multilevel power converters, defects in modules or communication links can be overlooked during maintenance, leading to reduced availability of the power converter despite servicing, due to the complexity and visual non-recognizability of these issues.
Innovation Solution
A method involving a control device that sends messages to modules with check values, allowing detection of errors by comparing received and sent messages, and storing information about errors in a monitoring device to generate a fault report, which includes identifiers and installation locations of affected modules or communication links.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual inspection of modules and communication links is performed during maintenance, then the power converter can be serviced, but defective modules and communication links are often overlooked due to the large number of components and their visual non-recognizability
Solution Approach 1:
The system implements automatic feedback mechanisms where modules send status messages to a control device, which compares received messages with sent messages to detect errors. This automated feedback loop eliminates manual inspection and ensures reliable detection of defective modules and communication links, directly resolving the contradiction between maintenance servicing and defect detection difficulty.
Solution Approach 2:
The monitoring system enables self-service by automatically detecting and documenting errors without requiring manual intervention. The control device autonomously compares messages, identifies discrepancies, and generates error reports, allowing the power converter to self-diagnose defects in its modules and communication links, thereby overcoming the limitations of manual inspection.
2Adaptability or versatility
If the power converter has a large number of modules and communication links, then high output voltages and scalability are achieved, but the complexity increases and defective components become harder to identify
Solution Approach 1:
The automated monitoring system provides feedback for each module and communication link, creating a manageable information structure despite the large number of components. Each module's status is independently tracked through message comparison, allowing the system to scale to high voltages while maintaining clear visibility into the status of individual components through structured feedback mechanisms.
Solution Approach 2:
The control device acts as an intermediary between the numerous modules and the monitoring system. It centralizes the collection and comparison of messages from all modules, simplifying the management of complexity by providing a single point of coordination that handles the large number of communication links and modules systematically.
3Reliability
If automatic error detection and documentation is implemented, then defective components are reliably identified, but additional monitoring infrastructure and message comparison mechanisms are required
Solution Approach 1:
The control device performs multiple functions: it controls the power converter operation, manages communication with modules, and executes error detection through message comparison. By making the control device universal and multi-functional, the patent avoids adding separate dedicated monitoring hardware, thereby achieving reliable error detection without proportionally increasing device complexity.
Data Source
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AI summary
The invention relates to a method for generating an error report relating to an electrical converter, having a plurality of similar modules (1_1, 1_2, 1_3), each having at least two electronic switching elements (202, 206) and an electrical energy storage means (210). In the method, a control device (35) sends a first message (425) to one of the modules (1_1), which first message (425) is transmitted to the module (1_1) via a communications connection (37) associated with the module (1_1). In addition, the module (1_1) sends a second message (430) to the control device (35). The first message (425) received at the module (1_1) is checked (502) to determine whether it differs from the transmitted first message, and the presence of an error is detected when the received first message (425) differs from the transmitted first message. When an error is detected, information (435) relating to said error is stored (508) in a monitoring device (410) and an error report (445) is generated.