A5002870554- HVDC Systems and Fault Protection
- Power Systems Fault Detection
- High-Voltage Power Transmission Systems
- Power Systems and Technologies
- Smart Grid and Power Systems
- Islanding Detection in Power Systems
- Power Systems and Renewable Energy
- Microgrid Control and Optimization
- Electrical Fault Detection and Protection
- Advanced Computational Techniques and Applications
- Power System Optimization and Stability
- Optimal Power Flow Distribution
- Machine Fault Diagnosis Techniques
- Fault Detection and Control Systems
- Lightning and Electromagnetic Phenomena
- Industrial Technology and Control Systems
- Service-Oriented Architecture and Web Services
- Simulation and Modeling Applications
- Advanced Sensor and Control Systems
- Power System Reliability and Maintenance
- Semiconductor Lasers and Optical Devices
- High voltage insulation and dielectric phenomena
- Advanced Optical Network Technologies
- Optical Network Technologies
- Photonic and Optical Devices
Southeast University
2005-2025
South China University of Technology
2015-2024
Chongqing University
2023-2024
City University of Macau
2024
Affiliated Hospital of Qingdao University
2024
Qingdao University
2024
Shandong University
2024
Shanghai Electric (China)
2022-2024
State Grid Corporation of China (China)
2024
Academe of Grassland And Animal Science
2024
The complexity of modern power grids keeps increasing due to the expansion renewable energy resources and requirement fast demand responses, which results in a great challenge for conventional grid control systems. Existing autonomous approaches requires an accurate system model powerful computational platform, is difficult scale up large-scale with more options operating conditions. Facing these challenges, this article proposes data-driven multi-agent scheme using deep reinforcement...
We propose an approach to deal with the problem of freeform surface illumination design without assuming any symmetry based on concept that this is similar optimal mass transport. With approach, converted into a nonlinear boundary for elliptic Monge-Ampére equation. The theory and numerical method are given solving problem. Experimental results show feasibility in tackling
Line-commutated converter-based-high-voltage direct-current (LCC-HVDC) transmission technology has been developing very rapidly. However, the sensitivity and reliability of HVDC line protection require further improvement. An analysis different fault types is conducted to show that normalized voltage change rate without influence wave propagation can more effectively distinguish between internal external faults with high resistances. Owing difficulty obtaining an accurate solution for a...
This paper presents a novel time-domain fault location algorithm on HVDC transmission lines. The Bergeron line model is adopted to construct equation, considering unsynchronized two-end measurement and uncertain parameters. zero time reference point set the sample of arrival at each end for traveling wave-head. Time-tags all points change with reference. So difference measurements has changed also, equals between arrivals two ends That makes it possible mix wave theory method. Besides, ratio...
The deployments of inverter-interfaced distributed generators (IIDGs) in medium voltage distribution networks may cause undesirable trips or tripping failures conventional two-terminal current differential protective relays. It is economically and technically unfeasible to reconfigure large numbers time-synchronized sampling clocks communication channels for each terminal inside the protected zone. In this paper, a more accurate IIDG mathematical equivalent model established that considers...
This article introduces a novel low rank approximation (LRA)-based model to detect the functional regions with data from about 15 million social media check-in records during year-long period in Shanghai, China. We identified series of latent structures, named spatio-temporal activity structures. While interpreting these we can obtain underlying associations between spatial and temporal patterns. Moreover, not only reproduce observed lower dimensional representative, but also project...
DC circuit breakers (DCCBs) are vital for the safe and continuous operation of large high-voltage dc grids. Insulated-gate bipolar transistor-based hybrid DCCBs (IHCBs) can interrupt currents quickly have good operational characteristics. Thyristor-based (THCBs) superior to IHCBs in terms interruption capacity because surge current thyristors. Nevertheless, existing THCBs limitations regarding one or more following characteristics: pre-activation, fast reclosing, quick small no requirement...
The stochastic response of microgrid regulation under the influence uncertainty should be considered in day-ahead optimal dispatching. This paper focuses on Stochastic Response Surface Method (SRSM) modelling and Second-Order Cone Programming (SOCP) solution for optimization strategy dispatching considering random fluctuations renewable energy supplies load demands. Based SRSM theory, distributions are converted into independent standard normal by Nataf transformation, then means a small...
Because the traditional zero-sequence overcurrent protection method is not effective in detecting single-phase-to-ground faults (SPGF) a low-resistance grounded system (LRGS), this paper analyzes fault characteristics of 10-kV LRGS detail. From perspective time domain, relationship between current and voltage deduced, corresponding to faulty lines nonfaulty are analyzed. The analysis reveals that ratio fluctuation coefficients differential have notably different characteristics;...
Ningxia wolfberry is the only product with medicinal value in China. However, nutritional elements, active ingredients, and economic of vary considerably among different origins Ningxia. It difficult to determine origin by traditional methods due same variety, similar origins, external characteristics. In study, we have for first time used a multi-task residual fully convolutional network (MRes-FCN) under Bayesian optimized architecture imaging from visible-near-infrared (Vis-NIR, 400-1000...
The Conventional zero-sequence (ZS) overcurrent protection method exhibits poor performance for single-phase to ground faults (SPGFs) with high impedance in low-resistance grounded systems (LRGSs), a type of medium-voltage (MV) distribution system. Hence, this study, novel SPGF detection methodology, designed specifically LRGSs, is proposed. Considering the effects system imbalance, crucial limitation based on ZS components, concept Δ-circuit first utilized suppress such effects, maintaining...
OPINION article Front. Digit. Health, 26 June 2020 | https://doi.org/10.3389/fdgth.2020.00005
A novel fault location scheme using feeder terminal units (FTUs) for high-impedance grounding faults in resonant systems (RGSs) is presented. The parallel resonance a (HIF) an RGS with inverter-interfaced distributed generators (IIDGs) analyzed. process exhibits unique distribution features transient zero-sequence components involving underdamped and overdamped states. We conclude that the admittances (TZSAs) from FTUs upstream of point have maximum value, while TZSAs obtained downstream are...
This research delves into the development of a composite model predictive controller designed for current loop in permanent magnet synchronous motor (PMSM) servo system. In order to enhance performance system, proposed integrates an extended state observer (ESO) and actuating delay compensation. The ESO is employed estimation lumped disturbance affecting PMSM, while prediction incorporates both estimated delayed output derive optimized control law. Simulation experimental results further...
Compared with conventional HVDC systems, the hybrid multiterminal (Hybrid-MTDC) system has a more sophisticated network topology composed of line commutated converter (LCC) and modular multilevel (MMC) stations, which leads to dc fault discrimination being difficult ambiguous. Furthermore, for long transmission lines, high resistances, different impedance characteristics, reliable external internal faults located at remote end T areas is particularly demanding. Therefore, considering...