带制动特性的变速抽蓄机组交流励磁绕组保护方法及系统
By filtering out the DC component and harmonics in the differential current using a three-point integral and average value filtering algorithm, and combining it with the ratio braking characteristic equation, the problem of locating short-circuit faults in the AC excitation winding of variable speed pumped storage units was solved, enabling reliable fault determination and location, and improving the sensitivity and reliability of the protection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- BEIJING SIFANG JIBAO ENG TECH
- Filing Date
- 2023-11-02
- Publication Date
- 2026-07-17
AI Technical Summary
The lack of effective protection methods in the current technology to distinguish between inter-turn short circuits and phase-to-phase short circuits in the AC excitation winding of variable speed pumped storage units makes fault location difficult and affects the stability of the power grid.
A three-point integral and average value filtering algorithm is used to filter out the DC component and harmonics in the differential current. Combined with the ratio braking characteristic equation of the total current of each phase on the stator side, a protection method is constructed to distinguish between faults inside and outside the zone. The fault location is determined by comparing harmonic differential and conventional differential.
It improves the sensitivity and reliability of AC excitation winding protection, and can reliably locate whether a short-circuit fault occurs on the stator side or the AC excitation winding side, which facilitates maintenance and ensures stable operation of the power grid.
Smart Images
Figure CN117650485B_ABST