Transient Voltage Information Entropy Difference Unit Protection Based on Fault Condition Attribute Fusion.

Area of Science:

• Electrical Engineering
• Power Systems Protection

Background:

• Traditional transient protection suffers from insufficient sensitivity and reliability under weak faults.
• Existing methods are susceptible to fault condition attributes like transition resistance and initial fault angle.
• Distinguishing between line faults, bus faults, and adjacent line faults with single-ended protection is challenging.

Purpose of the Study:

• To explore high-frequency transient voltage propagation characteristics in bus and line systems.
• To propose a novel unit protection method based on entropy difference in transient voltage information.
• To enhance the reliability and sensitivity of transient protection, particularly under weak fault conditions.

Main Methods:

• Investigated propagation characteristics of high-frequency components of transient voltage.
• Developed a unit protection method utilizing the entropy difference between line and bus transient voltage.
• Integrated fault characteristics with fault condition attributes to create composite fault characteristics.

Main Results:

• The proposed algorithm reduced original cross-data by 38.9%.
• False actions were decreased by 36.1%, and rejected actions by 6.1%.
• Extensive ATP-Draw simulations verified the algorithm's accuracy and reliability.

Conclusions:

• The entropy difference method effectively distinguishes fault types and improves protection reliability.
• Composite fault characteristics successfully mitigate the adverse influence of fault condition attributes.
• The proposed transient protection method offers enhanced performance for power systems.