Traction Power Signal Compression for Harmonic Monitoring
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Solution Overview
Problem
High-speed rail traction power supply networks face challenges in monitoring power quality due to complex structures, difficulty in detecting harmonics above the 50th order, and poor signal transmission performance, especially under poor communication conditions.
Innovation Solution
A method and apparatus that compress digital signal frames based on data link conditions, allowing for adjustable transmission of large or small frames to improve signal transmission performance, using a processing unit to collect and convert signals, and a storage unit to store and decode them, with features like run-length encoding and multi-processing for efficient data handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional power quality monitoring devices are used, then device simplicity is maintained, but measurement precision for harmonics above 50th order deteriorates
Solution Approach 1:
The patent segments the monitoring system into specialized functional modules: signal acquisition module for collecting multi-channel signals, signal processing module for transforming and analyzing signals, and specific detection units for different power quality parameters (harmonics, negative sequence, voltage fluctuations). This segmentation enables each module to be optimized for its specific function, achieving high-precision detection of harmonics above 50th order while maintaining overall system manageability through modular architecture.
2Measurement precision
If multi-channel power quality monitoring is implemented, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent implements a universal monitoring platform that can simultaneously perform multiple power quality monitoring functions through integrated signal processing. The system uses a common signal acquisition and processing framework that handles harmonics, negative sequence components, voltage fluctuations, and other power quality parameters in a unified manner, reducing structural complexity while maintaining multi-channel monitoring precision.
Solution Approach 2:
The patent employs a nested modular architecture where signal processing functions are organized in hierarchical layers. The signal acquisition module feeds into a core signal processing module that performs transformations (FFT, DFT), which then feeds into specialized analysis modules for different power quality parameters. This nested structure allows efficient resource sharing and reduces overall system complexity while enabling comprehensive multi-channel monitoring.
3Reliability
If signal transmission is performed under poor communication conditions, then reliability is maintained, but loss of information increases
Solution Approach 1:
The patent performs preliminary signal processing and compression before transmission to reduce data volume and improve transmission reliability under poor communication conditions. The system pre-processes signals to extract essential power quality features, compresses data using efficient algorithms, and prioritizes critical information for transmission, ensuring that even with limited bandwidth, the most important power quality data is transmitted reliably without significant information loss.
Data Source
AI summary
The present invention provides a method for monitoring electrical power in high-speed rail traction power supply networks/systems, comprising: collecting voltage and current analog signals from a traction power supply system, and converting the voltage and current analog signals into voltage and current digital signals; obtaining, by a processing unit, digital signals and transfer commands; compressing, by the processing unit, the digital signals according to the transfer commands to digital signal frames; and constructing a data link between the processing unit and a storage unit and transmitting the compressed digital signal frame to the storage unit. The processing unit may use run-length coding algorithm to compress the digital signal to be stored to obtain several compressed digital signal frames. Under different conditions of data link, transmission of compressed digital signal frames is adjustable to improve the reliability of digital signal transmission.