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学者姓名：吴翊
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Abstract ：
SF6 gas is widely used on many occasions especially in the power equipment, but it has been restricted since Kyoto Protocol as the strongest greenhouse gas. To reduce the SF6 emission, several methods are now used such the recycling & purification and the SF6 degradation. Considering the huge market of SF6 and the recent demand in the field of power equipment, it is necessary to explore new ways to thoroughly destroy SF6. This work brought out the idea to degrade retired SF6 by thermal plasma. A simplified kinetic model was established to predict the feasibility of this idea as well as the degradation products of SF6, and then the prototype of SF6 degradation by thermal plasma was built and tested. In thermal plasma, SF6 gradually decomposed into atoms, and then H2 was added to capture the released F atoms to generate HF and also prevent the association reactions of SF6. In order to achieve the desired degradation effect, the reaction temperature and the mixing ratio of H2 should be sufficiently high. However, excessive H2 could generate the H2S, and excessive discharge power could decrease the energy yield. When the flow rate of SF6/H2 was set as 8/30 L/min and the discharge current was set as 100A, the destruction removal efficiency (DRE) of SF6 was 99.0% and the energy yield was 206 g/kWh. This work also discusses how to further treat the by-products such as HF and S from this prototype effectively. © 2022 Elsevier Inc.
Keyword ：
Degradation; Destruction removal efficiency; Energy yield; H2; SF6; Thermal plasma
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| GB/T 7714 | Sun, H. , Long, H. , Wu, Y. et al. Simulation and experimental study on the degradation of the greenhouse gas SF6 by thermal plasma [J]. | Environmental Research , 2023 , 216 . |
| MLA | Sun, H. et al. "Simulation and experimental study on the degradation of the greenhouse gas SF6 by thermal plasma" . | Environmental Research 216 (2023) . |
| APA | Sun, H. , Long, H. , Wu, Y. , Guo, Y. , Rong, M. . Simulation and experimental study on the degradation of the greenhouse gas SF6 by thermal plasma . | Environmental Research , 2023 , 216 . |
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Abstract ：
The hybrid dc circuit breaker (HDCCB) is one of the most promising solutions for the dc interruption. But the power electronics-based load commutation switch (LCS) in the main current path causes the high on-state loss and cost, which inhibits the application of the HDCCB. In this paper, a novel hybrid dc circuit breaker is proposed, in which the vacuum interrupter with the external transverse magnetic field (ETMF) is designed to improve the arc voltage and thus enhance the current commutation to power electronics. The ETMF-based vacuum interrupter achieves the fast current commutation instead of the LCS, which realizes the low on-state loss and cost while preserving the short commutation and interruption time. The arc voltage characteristic with ETMF is analyzed, and the influence of the different factors on the commutation time and di/dt before current zero are investigated in detail. Based on the calculation results, a 10 kV dc breaker prototype based on the proposed topology is developed with the breaking current of 15.5 kA. Finally, the application of the proposed scheme in HVdc grids is discussed.
Keyword ：
Capacitors Circuit breakers External transverse magnetic field (ETMF) Fault currents hybrid dc circuit breaker (HDCCB) Interrupters Magnetic fields MVDC Prototypes Topology vacuum interrupter
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| GB/T 7714 | Wu, Yifei , Xiao, Yu , Wu, Yi et al. Hybrid MVDC Circuit Breaker Based on Enhanced Arc Voltage of Vacuum Interrupter [J]. | IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS , 2022 , 69 (5) : 4776-4785 . |
| MLA | Wu, Yifei et al. "Hybrid MVDC Circuit Breaker Based on Enhanced Arc Voltage of Vacuum Interrupter" . | IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS 69 . 5 (2022) : 4776-4785 . |
| APA | Wu, Yifei , Xiao, Yu , Wu, Yi , Rong, Mingzhe , Yang, Fei . Hybrid MVDC Circuit Breaker Based on Enhanced Arc Voltage of Vacuum Interrupter . | IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS , 2022 , 69 (5) , 4776-4785 . |
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Abstract ：
A hybrid fault current limiter (FCL) for medium-voltage direct current power systems is introduced in this article. It achieves low operation loss and high current limiting resistance through the combination of a fast mechanical switch, a magnetic induction module, and a number of liquid metal units (LMUs). First, the parameters of the magnetic induction module are designed to achieve a desired fault current commutation process. Then, the working principle of LMU is introduced, and its resistance properties corresponding to the liquid metal arc are studied in detail. Equations are deduced to model the V-I characteristic of LMU. Thus, the current limiting performance of the topology can be simulated. To verify the feasibility of the FCL, a 5-kV/5-kA prototype is developed and laboratory tests are implemented. Comparisons with other FCLs are also conducted to demonstrate the advantages of the proposed one. It is concluded that the prototype provides the basis for further commercial product development.
Keyword ：
Capacitors Circuit faults Current limiting fault current limiter (FCL) Fault currents Frequency modulation Limiting liquid metal (LM) medium-voltage direct current (MVdc) power system Prototypes Windings
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| GB/T 7714 | Wang, Beibei , Niu, Chunping , He, Hailong et al. Development of a Hybrid Fault Current Limiter Using Liquid Metal for Large Capacity MVdc Power Systems [J]. | IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS , 2022 , 69 (5) : 5050-5059 . |
| MLA | Wang, Beibei et al. "Development of a Hybrid Fault Current Limiter Using Liquid Metal for Large Capacity MVdc Power Systems" . | IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS 69 . 5 (2022) : 5050-5059 . |
| APA | Wang, Beibei , Niu, Chunping , He, Hailong , Wu, Yi , Rong, Mingzhe , Wang, Longlong et al. Development of a Hybrid Fault Current Limiter Using Liquid Metal for Large Capacity MVdc Power Systems . | IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS , 2022 , 69 (5) , 5050-5059 . |
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Abstract ：
The fast fault clearance in medium-voltage direct current (MVdc) grids requires the dc circuit breakers (DCCBs) with high breaking capability and low cost. The traditional hybrid DCCB realizes large current interruption relying on several insulated gate bipolar transistors in parallel, which results in difficulty of cost reduction. In this article, a novel DCCB with counter-current injection and integrated gate-commutated thyristor (IGCT) combined is proposed and analyzed. By combining forced commutation and IGCT, the large current breaking capability can be realized and the low cost is guaranteed. The simulation of the proposed DCCB is performed to evaluate the fault current breaking capability and influence of circuit parameters consisting of stray parameters and precharged capacitors on current commutation processes. Furthermore, a prototype of the 10-kV MVdc circuit breaker with 20-kA breaking capability is developed, and then the fault current breaking test is carried out to verify the validity of the proposed topology which can cut off current within 2.5 ms.
Keyword ：
Capacitors Circuit breakers Circuit faults Commutation capability Costs current commutation Fault currents integrated gate-commutated thyristors (IGCTs) medium-voltage direct current (MVdc) circuit breaker Topology Voltage
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| GB/T 7714 | Zhuang, Weibin , Rong, Mingzhe , Wu, Yifei et al. A Novel DC Circuit Breaker With Counter-Current Injection and IGCT Combined [J]. | IEEE TRANSACTIONS ON POWER ELECTRONICS , 2022 , 37 (3) : 3451-3461 . |
| MLA | Zhuang, Weibin et al. "A Novel DC Circuit Breaker With Counter-Current Injection and IGCT Combined" . | IEEE TRANSACTIONS ON POWER ELECTRONICS 37 . 3 (2022) : 3451-3461 . |
| APA | Zhuang, Weibin , Rong, Mingzhe , Wu, Yifei , Wu, Yi , Xiao, Yu , Wu, Xin et al. A Novel DC Circuit Breaker With Counter-Current Injection and IGCT Combined . | IEEE TRANSACTIONS ON POWER ELECTRONICS , 2022 , 37 (3) , 3451-3461 . |
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Abstract ：
High-voltage DC (HVDC) circuit breaker is the necessary equipment for multiterminal HVDC grids, which is a prospective power transmission method in the future. Therefore, the research about HVDC interruption ushered in an explosive development in recent years. The mechanical DC circuit breaker based on the precharged capacitor for current commutation and interruption is considered to be one of the most promising HVDC interruption solution. However, the commutation capacitor requires a complicated precharging circuit, especially in high-voltage applications, which brings a great challenge to the promotion of mechanical interruption solution. In this article, a novel self-charging mechanical HVDC circuit breaker is proposed. It utilizes the induced voltage generated by part of current limiting reactor to adaptively charge the commutation capacitor under different fault current conditions without extra auxiliary charging circuit. By investigating the influence of capacitance and inductance on the charging time and current commutation process, the optimized parameters are determined. Then, the breaking performance of proposed HVDC breaker under different rising rates of fault current is evaluated in a two-terminal HVDC system. Finally, a low-power prototype is developed to verify the feasibility of the proposed topology and an improved scheme for rated current breaking is discussed.
Keyword ：
Capacitors Circuit breakers Circuit faults Current commutation Discharges (electric) Fault currents HVDC transmission Inductors mechanical high-voltage DC (HVDC) circuit breaker parameter optimization self-charging
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| GB/T 7714 | Wu, Yifei , Peng, Sunhonghao , Wu, Yi et al. Technical Assessment on Self-Charging Mechanical HVDC Circuit Breaker [J]. | IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS , 2022 , 69 (4) : 3622-3630 . |
| MLA | Wu, Yifei et al. "Technical Assessment on Self-Charging Mechanical HVDC Circuit Breaker" . | IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS 69 . 4 (2022) : 3622-3630 . |
| APA | Wu, Yifei , Peng, Sunhonghao , Wu, Yi , Rong, Mingzhe , Yang, Fei . Technical Assessment on Self-Charging Mechanical HVDC Circuit Breaker . | IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS , 2022 , 69 (4) , 3622-3630 . |
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Abstract ：
Medium-voltage dc (MVdc) distribution systems have the advantages of high power density, low line loss and fast system response. However, the high rise rate and large peak value of short circuit current make the fault current interruption a critical problem in MVdc systems. To solve this problem, a novel circuit breaker scheme based on integrated gate-commutated thyristor (IGCTs) current sharing integrated with freewheeling is proposed in this article, which not only can ensure a high breaking capacity and short interruption time in the full current range, but also have superior vacuum interrupter recovery performance and high breaking reliability. The analysis of key factors, including stray parameters, inductance-capacitance (LC) parameters and arcing time, on the current commutation characteristics is presented, and the optimal design principle of the circuit breaker parameters is obtained. Finally, the proposed MVdc circuit breaker is verified with a 64.2 kA/10 kV fault current interruption experiment.
Keyword ：
DC circuit breakers (DCCB) integrated gate-commutated thyristor (IGCT) large capacity interruption stray parameter optimization
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| GB/T 7714 | Xiao, Yu , Wu, Yifei , Wu, Yi et al. High-Capacity MVDC Interruption Based on IGCT Current Sharing Integrated With Freewheeling [J]. | IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS , 2021 , 68 (11) : 10982-10991 . |
| MLA | Xiao, Yu et al. "High-Capacity MVDC Interruption Based on IGCT Current Sharing Integrated With Freewheeling" . | IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS 68 . 11 (2021) : 10982-10991 . |
| APA | Xiao, Yu , Wu, Yifei , Wu, Yi , Rong, Mingzhe , Yang, Fei , Gao, Chong et al. High-Capacity MVDC Interruption Based on IGCT Current Sharing Integrated With Freewheeling . | IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS , 2021 , 68 (11) , 10982-10991 . |
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Abstract ：
A novel liquid metal fault current limiter (LMFCL) is introduced to enhance the fault responding performance while increasing the rated current-carrying capacity. The proposed limiter utilizes an active trigger method to ignite the arc, achieving a much shorter pre-arcing time than the previous one, namely the self-pinch LMFCL. Firstly, the arcing phenomenon of liquid metal under a continuous current is studied, which results in a restriction of the rated current for a limiter. Then, the structure and working principle of the active triggered LMFCL are presen- ted. Experimental investigations are conducted to learn the whole arcing process. Furthermore, the current limiting performances based on the novel and conventional methods are compared, and the critical conditions of arc ignition under different parameters are studied. In addition, a continuous current-carrying test is implemented on an improved limiter. The results show that the proposed method is able to shorten the fault responding time significantly, while it allows the LMFCL to carry a considerable rated current. IEEE
Keyword ：
Active trigger; arc ignition; fault current limiters (FCLs); Fault currents; Ignition; Limiting; liquid metal (LM); Liquids; Metals; self-pinch effect; Steady-state; Surface treatment
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| GB/T 7714 | Niu, C. , Wang, B. , He, H. et al. A Novel Liquid Metal Fault Current Limiter Based on Active Trigger Method [J]. | IEEE Transactions on Power Delivery , 2021 , 36 (6) : 3619-3628 . |
| MLA | Niu, C. et al. "A Novel Liquid Metal Fault Current Limiter Based on Active Trigger Method" . | IEEE Transactions on Power Delivery 36 . 6 (2021) : 3619-3628 . |
| APA | Niu, C. , Wang, B. , He, H. , Wu, Y. , Rong, M. , Li, J. et al. A Novel Liquid Metal Fault Current Limiter Based on Active Trigger Method . | IEEE Transactions on Power Delivery , 2021 , 36 (6) , 3619-3628 . |
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Abstract ：
The triboelectric nanogenerator (TENG) has the advantages of low cost, high efficiency, flexibility, lightness, and portability. Therefore, it has caused more and more attention as an electronic skin sensor. Generally, the research on intelligent components mainly focused on flexible pressure or temperature sensors. However, the surface roughness recognition of object material still remains a challenge. Meanwhile, most of the current surface roughness recognition methods need secondary processing of the sensor signal, and rarely use the signal generated by the sensor to directly identify the surface roughness. In this paper, the load-dependent electric field model is transplanted to the conductor-dielectric contact-separation TENG (CS-TENG), and the surface roughness of conductor can be differentiated theoretically based on the output of CS-TENG. To verify its effectiveness, the TENG devices were fabricated and the home-processed steels of different roughness act as the conductor layers. By contacting the conductor layer with the dielectric layer, the electric output signal based on contact induced electrification can be generated, which can be used to quantitatively estimate the surface roughness of steels. The test results demonstrate that the output of CS-TENG decreases with the increase of surface roughness, which coincides with the simulation prediction. This method is low cost and easy to implement, which provides a new design idea to extend the functions of TENGs as tactile electronic skins.
Keyword ：
Conductors contact mechanics Electrodes load-dependent electric field Load modeling Rough surfaces Sensors Steel surface roughness Surface roughness tactile electronic skin Triboelectric nanogenerator
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| GB/T 7714 | Wen, Jian , Niu, Chunping , He, Hailong et al. A Load-Dependent Model of Triboelectric Nanogenerators for Surface Roughness Sensing [J]. | IEEE SENSORS JOURNAL , 2021 , 21 (18) : 20220-20228 . |
| MLA | Wen, Jian et al. "A Load-Dependent Model of Triboelectric Nanogenerators for Surface Roughness Sensing" . | IEEE SENSORS JOURNAL 21 . 18 (2021) : 20220-20228 . |
| APA | Wen, Jian , Niu, Chunping , He, Hailong , Han, Weilong , Zhong, Yilin , Wu, Yi . A Load-Dependent Model of Triboelectric Nanogenerators for Surface Roughness Sensing . | IEEE SENSORS JOURNAL , 2021 , 21 (18) , 20220-20228 . |
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Abstract ：
In this work, we studied the influence of electrode materials and airflow area on CO2 conversion in gliding arc plasma. Herein, the correlation between breakdown events, including back-breakdown and re-ignition, and conversion rate was discussed. The experimental results show that the motion characteristics of the gliding arc when using different electrode materials affect the CO2 conversion, especially the energy efficiency. Thereinto, the graphite material has the best performance. The correlation coefficient between breakdown events and the conversion rate reaches 0.85 at 4 l min(-1). Furthermore, the experiment of changing the airflow area verifies this value. Changing the airflow area increases the proportion of gas passing through the gliding arc, which can improve the CO2 conversion, especially at low flow rate. When the flow rate is 3 l min(-1), the conversion rate reaches 11.1%, which is much higher than the conversion rate before improvement.
Keyword ：
breakdown events CO2 conversion gliding arc graphite motion characteristics
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| GB/T 7714 | Sun, Hao , Chen, Zhuolei , Chen, Jiefu et al. The influence of back-breakdown on the CO2 conversion in gliding arc plasma: based on experiments of different materials and improved structures [J]. | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2021 , 54 (49) . |
| MLA | Sun, Hao et al. "The influence of back-breakdown on the CO2 conversion in gliding arc plasma: based on experiments of different materials and improved structures" . | JOURNAL OF PHYSICS D-APPLIED PHYSICS 54 . 49 (2021) . |
| APA | Sun, Hao , Chen, Zhuolei , Chen, Jiefu , Long, Hu , Wu, Yi , Zhou, Wenliang . The influence of back-breakdown on the CO2 conversion in gliding arc plasma: based on experiments of different materials and improved structures . | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2021 , 54 (49) . |
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Abstract ：
The medium-voltage dc (MVDC) interruption technology has grown in recent years, driven by increased interest in using MVDC system for integrating distributed renewable energy and improving the efficiency of power supply. In this paper, two topologies of current injection MVDC breaker are focused on. The first topology is based on conventional precharged capacitor that utilizes a bridge-type commutation branch to realize the freewheeling for the interrupter and bidirectional breaking. With the help of simulation, the effect of stray inductances on the current commutation capability is analyzed in detail, and then, a prototype of the MVDC breaker is built to test the fault current breaking performance. The second topology is an improved MVDC breaker based on magnetic induction current commutation module (MICCM). With MICCM analyzed carefully in terms of circuit and structure parameters for determining their optimal values, the prototype of the improved 10-kV dc breaker is built and tested, which validates the feasibility and effectiveness of improved topology.
Keyword ：
Bridge-type commutation branch Capacitors current injection Fault currents Inductance magnetic induction medium-voltage dc (MVDC) breaker Power electronics Prototypes Switches Topology
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| GB/T 7714 | Wu, Yifei , Wu, Yi , Yang, Fei et al. Bidirectional Current Injection MVDC Circuit Breaker: Principle and Analysis [J]. | IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS , 2020 , 8 (2) : 1536-1546 . |
| MLA | Wu, Yifei et al. "Bidirectional Current Injection MVDC Circuit Breaker: Principle and Analysis" . | IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS 8 . 2 (2020) : 1536-1546 . |
| APA | Wu, Yifei , Wu, Yi , Yang, Fei , Rong, Mingzhe , Hu, Yang . Bidirectional Current Injection MVDC Circuit Breaker: Principle and Analysis . | IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS , 2020 , 8 (2) , 1536-1546 . |
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