Daisy-Chain Power Converter Control for Communication Failure Isolation
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Solution Overview
Problem
Existing power conversion systems with multiple cell units connected in a daisy-chain manner face challenges in identifying and managing communication failures, which can lead to unsafe operation and difficulty in pinpointing the failure location.
Innovation Solution
The power conversion system incorporates a daisy-chain communication line with separate lines for control signals and operation permission signals. When a communication failure is detected, each slave station suspends power supply and controls other slave stations to suspend power supply as well, allowing the master station to identify the failure part once power supply is suspended across the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a daisy-chain communication system is used to connect multiple slave stations, then the system structure is simplified and ease of operation is improved, but communication failure detection and identification becomes difficult
Solution Approach 1:
The communication system is segmented into multiple independent communication lines (first communication line for control signals, second communication line for operation permission signals). This segmentation allows failure detection in one line without affecting the other, enabling precise identification of failure locations while maintaining the overall daisy-chain structure's operational simplicity.
Solution Approach 2:
The master station acts as an intermediary that receives communication signals from multiple slave stations through separate communication lines. By mediating the communication between slave stations and coordinating failure detection across multiple lines, the master station enables centralized failure identification while preserving the distributed daisy-chain architecture's ease of operation.
2Reliability
If communication failure detection is implemented in a daisy-chain system, then system safety is improved, but device complexity increases due to multiple communication lines
Solution Approach 1:
The communication system is divided into multiple independent communication lines, each dedicated to specific signal types (control signals vs. operation permission signals). This segmentation isolates failure detection to specific lines, improving reliability by preventing failure propagation while the modular nature of segmented lines keeps the overall system complexity manageable.
Solution Approach 2:
Each communication line serves multiple functions: normal operational communication and failure detection. The first communication line handles control signals and detects control signal failures, while the second communication line handles operation permission signals and detects permission signal failures. This multi-functionality improves reliability without proportionally increasing complexity.
3Measurement precision
If separate communication lines are used for control signals and operation permission signals, then failure identification precision is improved, but device complexity increases
Solution Approach 1:
The communication system is segmented into specialized lines: the first communication line is dedicated to control signals with failure detection capability, and the second communication line is dedicated to operation permission signals with failure detection capability. This functional segmentation enables precise identification of which specific signal path has failed, improving measurement precision while maintaining manageable complexity through clear functional separation.
Solution Approach 2:
Each communication line is designed with specific local qualities optimized for its function: the first communication line is optimized for control signal transmission and detection, while the second communication line is optimized for operation permission signal transmission and detection. This local quality differentiation enables precise failure identification in each line without requiring complex cross-line analysis, balancing precision with complexity.
Data Source
AI summary
A daisy-chain communication line of a power conversion system connects a master station for controlling a plurality of slave stations each including a power converter to the plurality of slave stations. The plurality of slave stations is configured to supply electric power to a load device from the power converter of each slave station. Each of the plurality of slave stations switches between “operation” for supplying electric power from the power converter and “suspension” for suspending supply of electric power and supplies electric power to the load device. The daisy-chain communication line includes a group of a first communication line for sending the control signal α and a second communication line for sending the operation permission signal β.