A5047750420- High-Voltage Power Transmission Systems
- HVDC Systems and Fault Protection
- Power System Reliability and Maintenance
- Microgrid Control and Optimization
State Grid Corporation of China (China)
2023
Huazhong University of Science and Technology
2020-2022
Although the harmonics interaction plays a vital role in causing commutation failure (CF) an ultra HVDC (UHVDC) system with hierarchical connection, it has not been sufficiently considered previous work. In this paper, electric among inverter valves of UHVDC connection during receiving fault transient process is demonstrated. Moreover, mechanism CFs also investigated via analysis interaction. After AC occurs, appearance processes local (LCF) and concurrent (CCF) are divided into several...
Harmonics interaction is an important factor in causing concurrent commutation failures (CCF) of multiple converter stations multi-infeed HVDC (MI-HVDC) systems, but it was not studied sufficiently existing literature. In this paper, the mechanism analysis and quantitative calculation harmonic are investigated. Firstly, generation process during AC fault events MI-HVDC systems with single-terminal connection hierarchical on receiving-end illustrated, respectively. Then, common...
Commutation failure (CF) is an inherent drawback of line-commutated converter high-voltage DC (LCC-HVDC) system. And CF prevention (CFPREV) control widely applied in UHVDC lines to mitigate the subsequent CF. However, formation a multi-infeed system induces power exchange and voltage interaction between AC buses during transient process, making behaviors mitigation CFs more complex. Consequently, exploring impact CFPREV on adjacent stations optimizing adapt characteristics necessary....
The continuous commutation failure (CCF) of high-voltage direct-current (HVDC) transmission system will cause consecutive impacts to the AC-DC hybrid power system. This paper proposes an improved firing angle control strategy with DC recovery rate and AC fault severity considered suppress CCF. dominant factors mechanism CCF are analyzed. Then, method dynamically adjusting according voltage drop is introduced. During after first failure, inverter side can be adaptively reduced improve margin....