A5103014070- High-Voltage Power Transmission Systems
- Power Systems Fault Detection
- HVDC Systems and Fault Protection
- Smart Grid and Power Systems
- Power Systems and Technologies
- Magnetic Properties and Applications
- Elevator Systems and Control
- Power Quality and Harmonics
- Advanced Decision-Making Techniques
- Smart Grid Security and Resilience
- Power System Reliability and Maintenance
- Multilevel Inverters and Converters
- Microgrid Control and Optimization
- Power Systems and Renewable Energy
- Islanding Detection in Power Systems
- Wind Turbine Control Systems
Huazhong University of Science and Technology
2006-2024
State Key Laboratory of Advanced Electromagnetic Engineering and Technology
2024
During nonsevere fault conditions, the crowbar protection is not activated and rotor windings of a doubly fed induction generator (DFIG) are still excited by ac/dc/ac converter. In these cases, dynamic response rotor-side converter (RSC) has large influence on current characteristics DFIG. this paper, an analysis method for DFIG under conditions proposed. First, RSC analyzed condition that external power control loop shut down reference signals inner kept constant. Then, simplified...
This paper presents a novel compensation technology of static synchronous compensator integrated with distribution transformer (DT-STATCOM). STATCOM is connected the taps at high-voltage (HV) windings. By selecting appropriate tap voltage level, it can help to make full use spare capacity transformer, simplify main circuit topology STATCOM, and reduce current level power devices. The theoretical basis for DT-STATCOM reactive explained. For Dyn-type structure multigroup HV windings mainly...
Static synchronous compensator (STATCOM) is a widely used power electronic device to achieve dynamic reactive compensation and improve the quality of system. The i p -i q current detecting method generally for STATCOM harmonic command detecting. However, it required that point be same as load when using traditional method, limiting flexibility choose installation position STATCOM. To solve this problem, paper proposed an improved both voltage phase angles are used, making no longer limited...
On the basis of principle breaker failure protection delay and analysis main factors which affect protection, a sub-station-area dead-zone technical scheme based on current differential is proposed. In this scheme, an incomplete structured by breakers transformer (CT) non-fault area, adjacent to fault area. When criteria are satisfied, will trip realise isolation fault. This not only affected CT tailing saturation, but also greatly reduces time achieves free setting. The implementation...
The series capacitor compensation is one of the key technologies in EHV and UHV long distance power transmission lines. This paper analyzes operation characteristics main protection combined with engineering practice when line overcompensation due to system modified influence transition resistance mode on current differential protection. According simulation results, it presents countermeasure improving sensitivity
For the Inverter-Interfaced Distributed Generator (IIDG) access system, a ground fault occurred on 110 kV contact line, and zero-sequence current distribution both sides of line was analyzed by combining characteristics controlled source IIDG after fault, relationship between sequence quantities, neutral grounding method transformer capacity IIDG. Factors. The analysis points out that side mode determines zero sequences line; when system circuit breaker is disconnected, mainly affects...
China has developed and utilized new energy represented by wind power photovoltaic generation on a large scale. The proportion of capacity in the grid is constantly increasing. short-circuit current characteristics 100% high-voltage at county level are complex, second harmonic component may exceed braking setting range transformer, resulting misoperation element. This paper first introduces main principle transformer protection level, then explains influence fault transient protection....