A5100745745- Microgrid Control and Optimization
- HVDC Systems and Fault Protection
- Islanding Detection in Power Systems
- Wind Turbine Control Systems
- Smart Grid Energy Management
- Advanced Sensor and Control Systems
- Optimal Power Flow Distribution
- Advanced Algorithms and Applications
- Frequency Control in Power Systems
- Power Systems and Renewable Energy
- Magnetic Properties and Applications
- Smart Grid and Power Systems
- Fatigue and fracture mechanics
- Advanced DC-DC Converters
- Industrial Technology and Control Systems
- Power System Reliability and Maintenance
- Adaptive Control of Nonlinear Systems
- Geoscience and Mining Technology
- Power System Optimization and Stability
- Stability and Control of Uncertain Systems
- Meat and Animal Product Quality
- Control and Stability of Dynamical Systems
- Power Quality and Harmonics
- Wireless Sensor Networks and IoT
- Auditing, Earnings Management, Governance
Tsinghua University
2001-2024
Wuhan University of Technology
2024
State Grid Corporation of China (China)
2024
Hunan University of Science and Technology
2010-2023
Hefei Normal University
2023
Goldwind (China)
2023
University of Shanghai for Science and Technology
2022
North China Electric Power University
2016-2022
Nanjing University of Aeronautics and Astronautics
2022
Xiangtan University
2022
Unstable subsynchronous control interaction (SSCI) between wind farms (WFs) and series-compensated grid has posed a big threat to the safety of equipment stability system. Many studies have been conducted on its analysis control. However, very little research done protection. To fill gap, this paper proposes system-wide protection against unstable SSCI in power systems with fixed series compensations. The is composed centralized coordinator (CPC) several distributed relays (DPRs). Local DPRs...
Recently, sub- and super-synchronous oscillation (SSO) associated with converter-based wind turbine generators (WTGs) has been attracting wide attentions. To investigate such SSO incidents, impedance or admittance-based modeling analysis were widely used. It was discovered that coupling effects exist between impedances admittances at complementary (i.e., sub super-synchronous) frequencies. However, there is a lack of experimental validation on the different WTGs. In this paper,...
Impedance/admittance models (IM/AMs) have been effectively utilized for the stability analysis of converter participated emerging oscillation issues. The IM/AMs are either derived from existing theoretical knowledge or measured by experimental approaches. However, it is quite challenging to get black/gray-box devices [such as based wind turbine generators (WTGs)] over a wide range operating conditions. This article proposes method identify AM voltage-sourced converters exploiting...
Recently, subsynchronous interaction (SSI), a type of stability issue caused by interactionsbetween power electronic converters and weak grids, has attracted greatconcerns. Many efforts have been made to use impedance/admittance‐based methodsfor its modelling analysis. However, most impedance/admittance models(IM/AMs) are aimed at higher‐frequency dynamics do not reflect the couplingeffects between sub‐ super‐synchronous frequencies or outer controlloops, which, as indicated in this work,...
The interactions between voltage-sourced converters (VSCs) and the grid may trigger unstable electromagnetic oscillations. Impedance model-based analysis is widely utilized for investigating such emerging stability issues, mainly due to its capability model black/gray-box VSC-based devices without complete knowledge of their internal control structures parameters. It well known that characteristics triggered oscillation are determined by operating conditions. However, most existing...
Recently, serious subsynchronous oscillation (SSO) events have occurred frequently due to the increasing interactions of direct-drive wind turbines with power systems. This emerging SSO would cause action torsional vibration protection and trip turbine generators. To ensure safe stable operation system avoid unnecessary oscillations, mechanism characteristics such SSOs are investigated. In this study, Hami in Xinjiang Uygur Autonomous region is taken as an example illustrate factors kind...
Recently, emerging sub‐synchronous oscillation (SSO) issues caused by the interaction between power electronic converters and weak AC grids have provoked serious stability concerns. Impedance‐based modelling approaches been widely employed for analysis of such interactions. In this study, a sequence‐domain frequency‐coupled impedance model (FCIM) corresponding criterion are proposed. First, fast identification method FCIM is proposed, in which impedance‐frequency curves FCIMs at multiple...
摘要: 工业机器人在推进工业自动化、柔性化、智能化发展道路上起着举足轻重的作用。机器人定位误差是制约其在生产制造领域应用的关键因素之一,定位误差的大小直接决定其制造所得产品的质量和精度,而机器人误差补偿技术对提高机器人的定位精度具有重要意义。以工业机器人定位误差测量-预测-补偿为线索,详细综述了国内外学者在开环测量和闭环测量技术、基于模型的误差预测和基于非模型的误差预测方法、在线补偿和离线补偿技术的研究进展。最后,对该领域的发展趋势进行了展望,以期对工业机器人定位误差补偿研究提供一定参考。
The operation characteristics of energy storage can help the distribution network absorb more renewable while improving safety and economy power system. Mobile systems (MESSs) have a broad application market compared with stationary electric vehicles due to their flexible mobility good dispatch ability. However, when urban traffic flows rise, congested environment will prolong transit time MESS, which ultimately affect state networks economic benefits MESS. This paper proposes bi-level...
In this study, we propose a novel distributed secondary control scheme for both voltage and frequency in autonomous microgrids. By incorporating predictive mechanisms into generations, the is converted to tracker consensus problem of model control, with synchronous convergence procedure magnitudes reference value drastically accelerated at low communication cost. A sufficient local stability condition parameter analysis established. Thus, proportional integral method combined finite-time...
Urban Railway Transit Power Supply System (URTPSS) involves power quality problems related to reactive and harmonics. In addition this, it is susceptible multi-system resonance at specific frequencies. Negative impedance caused by capacitive characteristics carries the risk of harmonic amplification, which may lead equipment damage instability within metro substation system. This paper analyzes monitored profile real-world "SHL" identifies harmonics 35kV AC bus. A theoretical analysis...
Most of the existing stability analysis methods are capable determining oscillatory black-box converter interfaced generators (CIGs) under given operating conditions only but can hardly identify critical conditions. In this letter, an region (OSR) is defined with short-circuit ratio and output power as variables, a method to obtain OSR for CIG proposed. First, modeled variable-operating-point impedance model (VOPIM) through perturbation tests. Then, points, which system has zero-damping...
In order to improve the scheduling flexibility of grid connected wind power generation system, it is necessary apply energy storage technology, and main key technology system how determine capacity configuration system. Using individual advantages superconducting magnetic (SMES), battery hydrogen storage, configured, which an management strategy based on principle meeting load shortage rate improving overall economy According whole life cycle cost theory, annual average function expression...
We construct an instrument to study the behavior of delamination strength in laminates which can be defined as critical transverse stress at actual occurs. The device allows anvil measurements room temperature or liquid nitrogen temperature. For electro-magnetic laminated materials (e.g., a superconducting YaBa2Cu3O(7-x) coated conductor has typical structure), was measured while properties transport current were also recorded. Moreover, influences external magnetic field on presented.
A grid model SMES system was developed for study on utility and customer power applications. The consists of a 20 kJ NbTi magnet, 15 kW 12-pulse IGBT current source converter DSP-based controller. To reduce the heat leakage, couple HTS leads were designed fabricated which are composed Bi-2223 tapes have maximum operating 150 A. topology chosen not only owing to its low total harmonic distortion (THD) but also high capability injecting capacitive reactive into network. In controller two very...