Potential Transformer Deviation Compensation in HVDC Systems
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Solution Overview
Problem
Potential transformers in HVDC transmission systems experience significant measurement errors, especially at high voltages, leading to increased errors when multiple transformers are installed, which can cause system faults and require costly precise sensing devices to mitigate.
Innovation Solution
A deviation compensation method that detects output voltage values, checks compensation values, and adjusts actual voltage measurements across multiple potential transformers using a common compensator, determining transformation ratio, offset, and gain values to standardize measurements and verify validity, allowing for easy replacement of faulty transformers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple potential transformers are installed to measure voltage at different locations, then system control and protection coverage are improved, but measurement error accumulates and increases
Solution Approach 1:
The patent applies parameter changes by introducing compensation values (transformation ratio, offset, and gain parameters) to adjust the measurement parameters of potential transformers. This allows the system to correct measurement deviations without changing the physical transformers themselves, thereby maintaining measurement precision while using multiple transformers for system coverage.
Solution Approach 2:
The patent implements feedback mechanisms by continuously monitoring voltage measurements from multiple potential transformers and applying compensation based on measured deviations. The system uses feedback loops to adjust compensation values dynamically, ensuring that measurement errors are corrected in real-time, thus maintaining both system coverage and measurement accuracy.
2Measurement precision
If more precise sensing devices are used to reduce measurement error, then measurement precision is improved, but installation cost and technological complexity increase
Solution Approach 1:
The patent introduces an intermediary compensation mechanism that acts between the potential transformers and the measurement system. Instead of replacing expensive precise sensing devices, the system uses compensation values as intermediaries to correct measurement errors, achieving high precision while maintaining simplicity and reducing costs.
Solution Approach 2:
The patent creates a virtual copy of the ideal measurement by applying compensation values that replicate what the measurement would be if perfect transformers were used. This allows the system to achieve precision equivalent to expensive precise devices without actually installing them, thereby reducing cost and complexity.
3Measurement precision
If compensation values are applied to correct measurement deviation, then measurement precision is improved, but system reliability may decrease due to potential errors in compensation values
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing compensation values before they are needed for correction. This allows the system to have compensation parameters ready in advance, reducing the risk of errors during real-time operation and maintaining system stability while achieving measurement precision.
Solution Approach 2:
The patent implements beforehand cushioning by preparing backup compensation values and validation mechanisms in advance. This cushioning approach ensures that if errors occur in compensation values, the system has pre-prepared measures to detect and handle them, thereby maintaining reliability while still achieving measurement precision through compensation.
Data Source
AI summary
A deviation compensation method of a potential transformer is provided. The deviation compensation method includes: detecting an output voltage value of a first potential transformer; checking a compensation value applied to the first potential transformer; compensating for the output voltage value based on the compensation value to measure an actual voltage value for a location at which the first potential transformer is installed; verifying the validity of the measured actual voltage value; and resetting a deviation compensator measuring the actual voltage value according to a result of verification on the validity of the actual voltage value.