Synchronous Generator Magnet Wheel Angle Determination
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Solution Overview
Problem
Existing methods for determining the magnet wheel angle of synchronous generators require complex calibration and precise placement of speed measuring devices, making them inefficient and prone to instability, especially when increasing capacitive reactive power output.
Innovation Solution
The method involves storing the idle time after synchronization of the synchronous generator with the power supply network and using the difference between the determined time and idle time to calculate the magnet wheel angle, allowing for sensor placement independence and automatic correction based on prevailing conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex calibration with precise sensor placement is used to determine magnet wheel angle, then measurement precision is improved, but device complexity and ease of operation deteriorate
Solution Approach 1:
The system automatically determines the idle time period during the synchronization process without requiring manual calibration. The evaluation unit autonomously identifies the time relationship between speed signals and frequency signals, eliminating the need for complex manual calibration procedures while maintaining measurement accuracy.
Solution Approach 2:
The idle time period is determined during the synchronization process before the generator is put into operation. This preliminary determination of the time relationship between sensors and voltage zero crossings allows the system to be ready for accurate magnet wheel angle measurement without requiring subsequent calibration adjustments.
2Measurement precision
If precise sensor placement is required for calibration, then measurement precision is improved, but ease of operation and adaptability deteriorate
Solution Approach 1:
The system self-calibrates by automatically determining the idle time period during synchronization. This eliminates the need for precise manual sensor placement, as the evaluation unit adapts to the actual sensor positions and voltage zero crossing points, allowing flexible sensor installation while maintaining measurement accuracy.
Solution Approach 2:
The system changes the reference parameter from fixed sensor positions to dynamically determined idle time periods. By using the actually measured time relationship between speed signals and frequency signals during synchronization, the system adapts to any sensor placement while maintaining accurate magnet wheel angle determination.
3Power
If capacitive reactive power output is increased through underexcitation, then power output is improved, but stability deteriorates
Solution Approach 1:
The system continuously monitors the magnet wheel angle by comparing the time relationship between speed signals and frequency signals. This feedback allows real-time detection of stability changes, enabling operators to maintain higher capacitive reactive power output while staying within stable operating limits through continuous angle monitoring and adjustment.
Solution Approach 2:
By determining the idle time period during synchronization before operation begins, the system establishes a baseline for magnet wheel angle measurement. This preliminary setup enables continuous monitoring of angle changes during capacitive operation, allowing the system to detect approaching stability limits and take preventive action.
Data Source
AI summary
The method involves storing a determined time duration as an idle time duration in an evaluating unit (6) after executed synchronization of a synchronous generator (2) with a three-phase power supply network (1) and without load application of the synchronous generator for calibrating the method. A difference time is formed from the determined time duration less the idle time duration for determining a polar wheel angle (delta) of the generator. The polar wheel angle is developed based on the difference time.