A5082494364- Islanding Detection in Power Systems
- Microgrid Control and Optimization
- Power Systems Fault Detection
- HVDC Systems and Fault Protection
- Power Systems and Renewable Energy
- Catalytic Processes in Materials Science
- Catalysts for Methane Reforming
- Catalysis and Oxidation Reactions
- Multilevel Inverters and Converters
- Spacecraft Dynamics and Control
- Spacecraft Design and Technology
- Solar and Space Plasma Dynamics
- Advanced ceramic materials synthesis
- Quantum Mechanics and Applications
- Magnesium Oxide Properties and Applications
- High-Voltage Power Transmission Systems
- Advanced Battery Technologies Research
- Quantum Computing Algorithms and Architecture
- Silicon Carbide Semiconductor Technologies
- Layered Double Hydroxides Synthesis and Applications
- Quantum Information and Cryptography
- Interconnection Networks and Systems
- Modular Robots and Swarm Intelligence
- Cellular Automata and Applications
- Corporate Finance and Governance
Changsha University
2022-2025
State Grid Corporation of China (China)
2021-2024
NARI Group (China)
2024
Hunan University
2023
China Astronaut Research and Training Center
2021
Guizhou University of Finance and Economics
2021
Beijing University of Posts and Telecommunications
2018
Tongji University
2015-2017
The traditional overcurrent protection is not suitable for the microgrid. One of main reasons that fault response inverter-interfaced distributed generator (IIDG) very different from rotational generator. This paper develops models IIDGs within a low-voltage microgrid, including active/reactive power (PQ)-controlled and voltage-controlled IIDGs. Considering control strategy PQ-controlled IIDG varies, this introduces adjustable parameters into model to reflect its characteristics as...
An integrated wide-area protection scheme for active distribution networks (ADNs) based on a fault components principle is proposed in this paper. The structure of three-level hierarchically coordinated system that enables the strategy introduced. To manage communication network failures, backup also proposed. In addition, can overcome problems complex operating conditions, such as islanding and non-islanding situations, resistance, high-impedance faults topology change. PSCAD/EMTDC used...
Since micro-sources are mostly interfaced to microgrid by power inverters, this paper gives an insight of the control methods micro-source inverters reviewing some recent documents. Firstly, basic principles different inverter illustrated analyzing electrical circuits and loops. Then, main problems typical improved schemes ωU-droop grid-supporting presented. In results discussion part, comparison kinds is presented notable research points discussed. It concluded that most promising method...
Based on non-maximally entangled four-particle cluster states, we propose a new hierarchical information splitting protocol to probabilistically realize the quantum state sharing of an arbitrary unknown two-qubit state. In this scheme, sender transmits secret three agents who are divided into two grades with Bell-state measurements, and broadcasts measurement results via classical channel. One agent is in upper grade lower grade. The only needs cooperate one other recover but both need help...
Island‐capable microgrids can potentially enhance the efficiency of distributed generations. In general, protection schemes in traditional distribution network cannot meet requirements microgrid internal protection. order to solve problem, this paper proposes positive‐sequence fault component current as starting criterion. And a graph model describing overall structure is established. The information about currents, including amplitude and direction, acquired locate branch. Furthermore, new...
Due to the existence of bidirectional fault currents in active distribution networks (ADN), a key issue its protection is how identify direction. In traditional power systems, positive sequence component (PSFC) based schemes are widely used, since they have good performance under different types fault. However, due diversity voltage variants and influence from low-voltage ride-through (LVRT) requirement, PSFC impedance angle an inverter-interfaced distributed generator (IIDG) difficult...
Abstract For low Earth orbit (LEO) satellites, solar panel is a firstly key device to convert the radiation into electric power supply energy consume. However, array always suffering from degradation due harsh space environments. To meet balance in end life of spacecraft, attitude determination and control system (ADCS) plays an important role direction change input. Here, cell performance parameters LEO satellite running on dawn-dusk Sun synchronous (SSO) are investigated. A yaw maneuver...
Three-level converter is a hot spot in the field of high power commutation research and application, one its key technologies modulation strategy that deserves attention. Traditional space vector pulse width (SVPWM) has some disadvantages such as complex algorithm large amount computation. For this, an optimized proposed. By redividing sector, three-level SVPWM converted into two-level SVPWM. And mature simple seven-stage technology used to obtain control equivalent switching state, which...
In traditional power systems, the positive sequence fault component (PSFC) based criteria is often used to identify directions. If PSFC impedance angle of inverter‐interfaced distributed generator (IIDG) between 0 and 90°, PSFC‐based will remain applicable in active distribution networks (ADNs). However, due diversity IIDG control mode uncertainty voltage variation caused by faults, difficult determine. To solve this problem, paper proposes a two‐stage scheme for IIDG. At different stages,...
Multi-microgrid has many new characteristics, such as bi-directional power flows, flexible operation modes and variable fault currents with different control strategy of inverter interfaced distributed generations (IIDGs). All these featuring aspects pose challenges to multi-microgrid protection. In this paper, current voltage characteristics feeders are analyzed when occurs in positions multi-microgrid. Based on the distribution line parameters, a protection scheme for internal is proposed,...
Microgrid is characterized by the bidirectional fault current, thus a key issue of microgrid protection to accurately determine direction. In traditional multi-generator system, directional element based on positive sequence component (PSFC) widely used, since it has good performance under different types faults. this paper, PSFC network an inverter-based analyzed. The analysis results show that direction can be determined only when equivalent impedances all distributed generators (DGs) in...
Abstract The grid‐forming converter (GFC) is used to regulate the voltage and frequency of a local grid. However, due limited current capacity, GFC must actively modify its control strategy when serious external fault occurs, thus avoid possible damage caused by overcurrent. This paper proposes novel reference generation method for based on equivalent impedance magnitude (EEIM), which has following merits: (i) faulty phase currents non‐faulty can be controlled within their operational...
Abstract Durable CuO/ZnO/CeO 2 /ZrO catalyst on SiC support for methanol steam reforming (MSR) was prepared by the combination of inverse microemulsion method and precipitation which is termed as microemulsion/precipitation method. The presence Ce−O−Zr solid solution facilitated production oxygen vacancies Ce 3+ species in catalyst. Owing to unique tiny reaction pool addition precipitant method, particle size principally between 6 nm, with an average 3.66 nm. Besides, small highly dispersed...
The family of frequency estimators based on discrete oscillator is believed to be the simplest one for single-phase grid voltage. In order make this more feasible in micro-grid, a novel design proposed paper. novelty includes clear input-output relationship oscillator, an optimized model (DOM) and enhanced pre-filter. Firstly, established by time-domain feedback analysis, it reveals have inherent complex-coefficient comb filtering ability. Then DOM given makes high ability near nominal...
Abstract Company performance can directly reflect the operation’s status, which has always been one of central topics. Starting from CEO power, this paper introduced corporate innovation strategy and ownership concentration, established corresponding research model, studied relationship between them. In model design, company was taken as dependent variable, power concentration independent variables, then data processing software used to establish a regression model. Through test, it is found...