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Европейская академия
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| В начало | Энциклопедия ЕАЕН | |
Энциклопедия Европейской академии естественных наук |
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Liu Jian
Liu Jian, a PhD, a professor, and a professorial senior engineer, is currently Vice President of the State Grid Shaanxi Electric Power Research Institute. He serves as a part-time professor and doctoral supervisor at 8 universities, including Xi'an Jiaotong University, and is a member of the editorial board for 7 electrical core journals, including Power System Automation. Additionally, he is a senior member of IEEE, a member of the Standardization Technical Committee of the State Grid Corporation of China, the vice chairman of the Power Distribution Special Committee of the National Electric Power Transmission and Distribution Collaboration Network (EPTC), and the chairman of the Distribution System Monitoring and Automation Committee of PSIM of IEEE PES China. He is a recipient of the Special Government Allowances from the State Council, a national level candidate for the Ten thousand Talents Project, a scientific and technological leader of State Grid Corporation, and was awarded the China Electric Power Science and Technology Person of the Year Award. He was listed among the top 2% of globally influential scientists by Stanford University and ELSEVIER. He has won the Science and Technology Progress Award 40 times, published 19 books and more than 300 academic papers, and holds 57 invention patents. He is the founder of power distribution automation technology in China.
The distribution automation system developed by Liu in the Yinchuan urban area is the earliest distribution automation system in China. He establishes a variable-structure dissipative network model and a scale reduction calculation method for complex distribution networks. Furthermore, he presents a fast recovery method for large-area power outages in distribution networks, which has already been implemented in 23 large cities. He proposed fault-tolerant fault location and healthy area optimization restoration methods for distribution networks, instantaneous trip protection for the whole feeder, fast current-limiting protection, and adaptive reclosing principles, communication-independent feeder automation, and fast self-healing principles for neighborhood interaction. These innovations have become commonly used in distribution automation products in China.
He proposed the principle of a phase-controlled pre-adjusted arc extinguishing coil, a new approach to complex ground fault handling, and an active modulation based high-resistance ground detection method. Above innovation has been applied in the distribution system with 267 110kV substations，based on which, cable trench fires due to single-phase ground faults are successfully prevented. Additionally, he proposed the principle of active intervention based arc extinction, which can reliably quench the arc in the case of single-phase grounding without power outage. These inventions have been adopted by over 100 smelting and chemical enterprises that require continuity power supply.
He invented the main station injection test method and the main station and secondary synergistic injection test method and developed a complete set of equipment to test Feeder Aotomation Systems. He invented a controllable arc generator used for the system-level field testing of single-phase grounding fault handling performance and developed a mobile test equipment and defect diagnosis expert system to address the historical challenge of having to wait for faults to occur on the operational grid for testing, which often resulted in the inability to detect defects in a timely manner. It has been applied in more than 100 cities for distribution automation project testing.
He proposed a multi-objective elite optimization and robustness evaluation method, an engineering testability analysis method for situations where measurements are lacking, and a test plan optimization method. He proposed the sampling blind number theory, which addressed the challenge of analyzing the uncertainty of random variables with arbitrariness probability-distributing passing through any linear or nonlinear systems. These innovations have been applied to the health-state diagnosis of substation grounding grids and transformers.
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