基于频域能量矩阵相似度的柔直电网纵联保护方法
By using a longitudinal protection method based on frequency domain energy matrix similarity, the problems of insufficient rapid fault identification and anti-interference capability in traditional flexible DC power grid protection are solved. This method achieves fault identification with high reliability and strong resistance to transition resistance, ensuring the stable operation of the flexible DC power grid.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- TIANJIN UNIV
- Filing Date
- 2024-01-22
- Publication Date
- 2026-07-17
AI Technical Summary
Traditional flexible DC power grid protection schemes are insufficient in terms of rapid fault identification, anti-interference capability, and resistance to transition resistance. They are particularly prone to malfunction under lightning interference, making it difficult to meet the requirements of high reliability.
A longitudinal protection method based on frequency domain energy matrix similarity is adopted. The protection is activated by measuring the change in fault voltage at both ends of the line, the fault current is decoupled by smoothing reactor, the frequency domain energy matrix is extracted by S-transform, the similarity is calculated to identify faults inside and outside the region, and interference is eliminated by combining the lightning strike identification criteria, and the fault type is determined by polarity selection.
It improves the reliability and anti-interference capability of flexible DC power grid protection, can withstand a transition resistance of 700Ω, accurately distinguishes between internal and external faults, prevents maloperation due to lightning interference, and ensures the stable operation of the power transmission system.
Smart Images
Figure CN117937368B_ABST