AC Grid Load Flow Mapping Using Distributed Phase Angle Sensing
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Solution Overview
Problem
Existing methods fail to accurately generate a load flow map within an AC-voltage power supply grid, which is crucial for understanding local power flows and identifying potential overloads or imbalances.
Innovation Solution
A method where grid subscribers determine their individual phase angles of the AC voltage at their connection points, transmit these values to a central data receiver, and evaluate them to generate a load flow map, utilizing a reference signal and GPS time signals for synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single reference signal transmitter is used to provide phase information, then the device complexity is reduced, but the measurement precision of load flow mapping is insufficient
Solution Approach 1:
The patent divides the power supply grid into multiple measurement zones, each equipped with its own reference signal transmitter. This segmentation allows phase information to be collected from multiple independent points, thereby improving the overall measurement precision of the load flow map without significantly increasing system complexity, as each zone operates autonomously with standardized equipment.
Solution Approach 2:
The patent combines phase information from multiple reference signal transmitters distributed across different zones with data from grid subscribers to create a comprehensive load flow map. By merging these multiple data sources and coordinating their measurements through a central evaluation unit, the system achieves high measurement precision while maintaining manageable device complexity through standardized interfaces and protocols.
2Measurement precision
If phase information is collected from multiple distributed points, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The patent designs the reference signal transmitters and grid subscriber devices with multi-functionality, enabling them to perform phase measurement, data processing, and communication functions. This universal design allows the same type of device to be deployed across multiple zones, improving measurement precision through distributed measurement while avoiding the complexity increase that would result from using different specialized devices for each function.
Solution Approach 2:
The patent introduces a central evaluation unit that acts as an intermediary between the distributed reference signal transmitters and grid subscribers. This intermediary coordinates the collection and processing of phase information from multiple points, enabling high measurement precision while managing device complexity by centralizing the complex processing tasks and providing standardized interfaces for all distributed devices.
3Manufacturing precision
If local phase angle measurements are performed at multiple grid connection points, then the load flow map accuracy improves, but the quantity of data to be transmitted and processed increases
Solution Approach 1:
The patent extracts only the essential phase angle information from each grid connection point and transmits this extracted data to the evaluation unit. By taking out only the critical phase information rather than transmitting complete raw measurement data, the system achieves high load flow map accuracy while minimizing the quantity of data that needs to be transmitted and processed across the network.
Solution Approach 2:
The patent performs preliminary processing of phase information at each grid connection point before transmission, where local devices calculate and prepare phase angle data in advance. This preliminary action reduces the data volume that needs to be transmitted by pre-processing and filtering data at the source, thereby achieving accurate load flow mapping with reduced data transmission requirements.
Data Source
AI summary
A method for ascertaining a load flow map within an AC-voltage power supply grid, wherein a plurality of grid subscribers are each arranged at a respective grid connection point in the power supply grid, includes ascertaining, by each of the plurality of grid subscribers, a respective value reflecting an individual phase angle (ϕ) of the AC voltage of the power supply grid at the respective grid connection point of each of the plurality of grid subscribers. The method also includes transmitting the respective values in the form of data from the respective plurality of grid subscribers to a superordinate data receiver; and evaluating the data and generating a load flow map based on the values reflecting the individual phase angles (ϕ).