A5030238786- HVDC Systems and Fault Protection
- Power Systems Fault Detection
- High-Voltage Power Transmission Systems
- Islanding Detection in Power Systems
- Membrane Separation and Gas Transport
- Polymer Foaming and Composites
- Advanced Sensor and Energy Harvesting Materials
- Advancements in Battery Materials
- Membrane Separation Technologies
- Surface Modification and Superhydrophobicity
- Supercapacitor Materials and Fabrication
- Electrospun Nanofibers in Biomedical Applications
- Electrical Fault Detection and Protection
- Image Retrieval and Classification Techniques
- Magnetic confinement fusion research
- Innovative Microfluidic and Catalytic Techniques Innovation
- Phase Equilibria and Thermodynamics
- Smart Grid Security and Resilience
- Cardiac Structural Anomalies and Repair
- Lightning and Electromagnetic Phenomena
- Magneto-Optical Properties and Applications
- Vehicle License Plate Recognition
- Frequency Control in Power Systems
- Power Systems and Technologies
- Handwritten Text Recognition Techniques
Tsinghua University
2018-2025
Xiamen University
2015-2017
State Council of the People's Republic of China
2015-2017
Flexible solid-state supercapacitors attract more and attention as the power supply for wearable electronics. To fabricate such devices, flexible economical current collectors are needed. In this paper, we report stainless steel fabrics collector high-performance graphene-based supercapacitors. The have superior properties compared with widely used collectors. show large specific capacitance of 180.4 mF/cm2, retention 96.8% after 7500 charge–discharge cycles. Furthermore, 96.4% is retained...
The back-to-back modular multi-level converter–high-voltage DC (MMC-HVDC) system is gaining popularity in the field of enhancing power transmission capacity but poses challenges to fault diagnosis. A novel method for location such a based on convolutional networks (ConvNets) presented. proposed uses voltages and currents only one terminal lines. Compared with existing methods, automatically learns features from dataset voltage signals. then achieved by linear regression an L 1 penalty using...
In the development of power systems, traditional AC grids are gradually evolving into AC/DC hybrid grids. However, safety is threatened by cascading faults, which a set chain events caused single fault and will eventually lead to blackout. Based on blackout accident that happened in Brazil March 21st, 2018, this paper analyzes cause, mechanism, faults Simulations based PSCAD/EMTDC software have been carried out illustrate typical scenario including HVDC commutation failure, DC blocking, flow...
Double-terminal traveling wave-based fault location is one of the most reliable and accurate technologies for power transmission line location. However, existing methods require a global positioning system (GPS) or communication latency estimation to synchronize data from two terminals. In this study, we propose an innovative double-terminal method that independent either GPS estimation. The basic principle proposed arrival time difference between initial surges could be roughly calculated...
This paper presents a novel, etching-free and versatile preparation methodology, using commercially available polystyrene CO<sub>2</sub>-expanded liquid selective swelling process combined with hyper-cross-linking reaction.
Commutation failures represent a prevalent issue encountered in line-commutated-converter high voltage direct current (LCC-HVDC) systems. As the widespread deployment of HVDC systems continues, risk associated with commutation increases, posing growing threat to power grids due their potential trigger severe consequences, including cascading and blackouts. This research paper aims address significant failure within (DC) through advocating for use resistive-type Superconducting Fault Current...
High voltage direct current (HVDC) technology is the ideal solution for long distance bulk power transmission. However, different from AC systems, differential protection of HVDC lines still faces a lot challenges. We claim that perspective state estimation, essence to estimate variables using measured data, which validity indicates whether there fault. Therefore, performance highly related model accuracy. Using detailed distributed parameter line model, this paper developed novel method...
Optical voltage transformer (OVT) is a new emerging with the development of microelectronics technology, optoelectronic technology and digital which based on linear photoelectric effect polarization optics. Compared traditional transformers, OVT has advantages isolation, wide frequency band, high accuracy dynamic range, so was highly expected when it appeared. However, at early stage OVT's promotion, mainly used to measure power voltage. Moreover, although capacitive had many shortcomings...
Chinese characters are always arranged in arbitrary orders and forms scene images which difficult to handle for text line based methods. Recently approaches adopt irregular reading solve this problem but a is often ambiguous. In paper, we propose character framework spotting from another view. Specifically, the consists of three components detection, recognition grouping respectively. It worth mentioning that novel Conditional Random Field(CRF) algorithm presented arrangement text....
This paper proposes an inverse time zero sequence protection using traveling wave starting information, which solves the problem of delayed action when a single-phase high resistance ground fault occurs. On transmission line with as main protection, it must be equipped corresponding backup based on power frequency, and zero-sequence direction performance is superior. However, delay required for faults in zone. article uses startup information double-terminal to accelerate realize full-line...
Commutation failure (CF) is one of the major concerns in high-voltage direct current (HVDC) transmission system. Of many methods to mitigate CF, advancing firing angle preferred since it can be easily implemented HVDC controllers without extra hardware modification. However, previous works either lack for quantitative analysis or based on much strong hypothesis. In this paper, we propose a novel CF mitigation method improved commutation area. The salient feature proposed strategy that DC not...
With the rapid consumption of non-renewable energy such as fossil energy, countries around world are vigorously developing wind, light, geothermal and other renewable energy. Since most large-scale power stations located in remote areas, order to better connect grid, is widely used through flexible DC connection transmission scheme. The AC line station incorporated into double ended converter supply has new fault characteristics. This paper introduces application traveling wave differential...
Commutation failures represent a prevalent issue encountered in line-commutated-converter high voltage direct current (LCC-HVDC) systems. As the widespread deployment of HVDC systems continues, risk associated with commutation increases, posing growing threat to power grids due their potential trigger severe consequences, including cascading and blackouts. This research paper aims address significant failure within (DC) through advocating for use resistive-type Superconducting Fault Current...
Superconducting fault current limiters (SFCLs) offer an efficient means of limiting currents and supporting system reliability. However, they weaken the characteristics reduce sensitivity traditional relay protection. The seamless integration SFCLs with protective relays remains a complex under-explored area, impeding their widespread industrial adoption. In parallel, differential (CDPs) are almost primary protection for all high-voltage electrical equipment cornerstone global power...
Several MMC-HVDC systems with renewable energy sources connected have been constructed in the past decades. For AC transmission lines between MMC stations and sources, fault-ride-through strategies at both ends will lead to complicated fault characteristics. Specifically, current amplitudes are restricted phase angles controlled, characteristics decrease reliability sensitivity of traditional relay protection. This paper proposes a differential protection based on traveling wave theory,...
Traveling wave differential protection (TWDP) has shown advantages over traditional current in terms of sensitivity, rapidity and immunity to distributed capacitive current. However, existing TWDP schemes depends heavily on data synchronization through either GPS or communication, which the potential failure should be considered. This paper discusses backup solutions for condition failure. Firstly, influence error is analyzed. The results indicate that such would lead mal-operation under...
Correction for ‘Hierarchically porous polystyrene membranes fabricated <italic>via</italic> a CO<sub>2</sub>-expanded liquid selective swelling and <italic>in situ</italic> hyper-cross-linking method’ by Haozong Wang <italic>et al.</italic>, <italic>RSC Adv.</italic>, 2015, <bold>5</bold>, 68639–68645.
Fault location in distribution systems includes 2 subtasks: fault distance estimation and section identification. This paper presents a method based on reclosure-generating traveling waves system topology. Firstly, the under normal conditions are analyzed to find wave reflected by point, through which could be estimated. Secondly, we propose identification comparing real measured with simulated different potential points. Noticing that only time information of rather than their magnitude is...