Multiphase Signal Sampling Correction Without Period Synchronization
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Solution Overview
Problem
Existing methods for sampling electrical signals in multiphase installations face challenges in correcting samples on a predetermined phase due to measurement errors or omission, requiring reconciliation of precision with simplicity, often involving significant memory and synchronization with the fundamental period.
Innovation Solution
A method that superimposes samples from correct phases over a fundamental period, determining a limit to minimize time differences, and correcting samples on the predetermined phase using an iterative process, allowing for precise correction without extensive memory or synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If synchronization with the fundamental period is implemented, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system uses the naturally occurring fundamental period of the electrical signals itself to guide the sampling process, rather than requiring an external synchronization source. The sampling automatically adapts to the signal's inherent periodicity, making the system self-synchronizing and eliminating complex synchronization hardware.
Solution Approach 2:
The invention changes the sampling parameter from a fixed synchronized timing to a variable timing based on the detected fundamental period. By dynamically adjusting the sampling instant according to the actual signal period, the system achieves precise measurement without requiring complex pre-synchronization mechanisms.
2Measurement precision
If a memory for storing sample values is implemented, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system performs preliminary detection of the fundamental period before conducting the actual sampling and correction operations. By knowing the period in advance, the system can directly calculate the correct sampling instants and perform corrections without needing to store and process large amounts of historical sample data, thereby reducing memory requirements.
Solution Approach 2:
Instead of storing all sample values in memory, the invention uses the fundamental period to create a simplified representation or model of the signal behavior. This allows the system to reconstruct or correct samples mathematically without physically storing every measured value, reducing memory needs while maintaining precision.
3Ease of operation
If fixed sampling period is used, then ease of operation is improved, but measurement precision deteriorates
Solution Approach 1:
The system transitions from a static fixed sampling period to a dynamic sampling approach where the sampling instant is adjusted based on the detected fundamental period. This dynamic adaptation maintains the simplicity of fixed-period implementation while achieving the precision of synchronized sampling by automatically adjusting to the actual signal characteristics.
Data Source
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AI summary
The method involves successively providing samples on correct phases by a processing unit, where the samples are associated to sampling indexes and sampling instants respectively. The samples of each phase are superposed on a fundamental period. A limit is determined for each phase, where the limit is equal to a value of the index of the sample, for which a space between a relative instant associated to the sample and the instant associated to the sample of a preset phase is minimized. A series of consecutive samples of the predetermined phase is corrected. An independent claim is also included for a device for sampling an electrical signal of an electrical multiphase installation, and for permitting to correct samples on a predetermined phase and comprising a processing unit permitting the correction of samples of the phase from correct phase samples, by using a method for sampling an electrical signal of a multiphase electrical installation.