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Workshop on Wide Bandgap Power Devices and Applications in Asia (WiPDA Asia)

作者： Cheng Qian Zhiqiang Jack Wang Yong Kang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781665448178

This paper presents a theoretical analysis and an optimized parameter design method of desaturation short-circuit protection for fast response speed and strong noise immunity in silicon carbide (SiC) applications. First, the mechanism of false triggering of desaturation protection is analyzed in detail, and several key related factors are identified based on the analysis. Second, a noise suppression ability evaluation method is presented. A corresponding optimized parameter design method is also presented, which is capable of enhancing noise immunity without sacrificing response speed. Third, several influencing factors are also discussed based on evaluation method. Finally, experimental results are presented to validate the proposed parameter optimization method.

关键词： MOSFET Inductance Silicon carbide Photonic band gap Design methodology Conferences Asia

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Principle and Implementation of Networked Protection in Active Distribution Networks

Principle and Implementation of Networked Protection in Acti...

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IEEE Conference on Energy Internet and Energy System Integration (EI2)

作者： Jiexiang Han Zhe Zhang Qisheng Ran Xianggen Yin State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781665434263

The performance of conventional protections has deteriorated in active distribution networks (ADN) because of high penetration of distributed generator (DG) and solid state transformer (SST). In this paper, based on the features of short-circuit current fed by DG and SST, the current distribution characteristics of ADN are analyzed. Moreover, a networked protection scheme is proposed for ADN. This scheme compares the amplitudes of negative-sequence, zero-sequence and phase currents between different ports of grid component to realize fault identification. It can act rapidly and has the ability to cope with large transition resistance. Communication system only needs to transmit current amplitude, and synchronous sampling is not required. In addition, there is no requirement for voltage measurement, which will help to reduce cost. The effectiveness of the protection scheme is verified via simulation tests.

关键词： Fault diagnosis Resistance Voltage measurement Voltage transformers Simulation Short-circuit currents System integration

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Dual-Loop PQ Control Scheme for Transient Stability Enhancement and Current Limitation of VSG

Dual-Loop PQ Control Scheme for Transient Stability Enhancem...

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International Conference on Power System technology (POWERCON)

作者： Kun Sun Wei Yao Jinyu Wen State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781665407380

The transient angle instability and overcurrent of the virtual synchronous generator (VSG) under severe fault are risks for the stable and safe operation. Existing works have proposed some efficient methods for the transient stability enhancement or current limitation of VSG. Yet, the consideration for both of them is rarely studied. Moreover, the reasonable parameter design method for the control is usually lacked. In this paper, with the large signal model of VSG, a dual-loop PQ control scheme is introduced. With the proposed method, both the transient angle stability and overcurrent can be controlled simultaneously. In addition, how to design the reasonable coefficients of the proposed control scheme with additional requirement of output active power is also presented. The effect of the proposed method can be achieved with the coefficients in the allowable range. Finally, this method is validated by simulation results.

关键词： Simulation Design methodology Power system stability Stability analysis Synchronous generators Transient analysis

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A Novel Switching Method for All-speed Sensorless Control Strategy Based on Aviation Motor

A Novel Switching Method for All-speed Sensorless Control St...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Zixin Li Shuanghong Wang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

All-speed sensorless control method on aviation motor has been investigated in recent years due to the strict operation request of More Electric Aircraft (MEA). Generally, I/F startup strategy and back-EMF based method are combined with a linear current reduction (LCR) switching method to realize all-speed sensorless control on PMSM. Nevertheless, conventional LCR method has bad transition performance under no-load and light-load conditions. Therefore, a linear angel reduction (LAR) switching method is proposed in this paper to smooth the transition process between I/F strategy and SMO algorism. The current in LAR method declines in a specific regulation which causes the angel to reduce in a constant rate. LAR method can be used in speed stationary and speed variation circumstance, furthermore it doesn't need to change parameters along with load variation. Compared to LCR method, LAR method eliminates the angel jumping problem in switching process. Consequently, it not only suppresses the current ripple but also reduces the speed oscillations significantly. Comparison simulation results of LCR method and LAR method are presented to verify the feasibility and effectiveness of the proposed switching method.

关键词： Simulation Switches Sensorless control Load management Regulation Aircraft Oscillators

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A New Excitation Power Supply for Large Capacity Superconducting Condenser

A New Excitation Power Supply for Large Capacity Superconduc...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Guangyi Zhang Chun Song Fan Zhou Dayi Li Jie Gong Weiyu Wang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

Superconducting condenser has the characteristics of small excitation resistance and small transient and sub transient reactance. Therefore, compared with conventional condenser, superconducting condenser can output greater reactive power and has better reactive power compensation characteristics. Just like the conventional condenser, the superconducting condenser also needs to be equipped with its supporting excitation power supply. At present, there is less research on the excitation power supply of the superconducting condenser. Therefore, this paper proposes a new excitation power supply system relative to the superconducting condenser, which lays a theoretical foundation for the future research work. Firstly, the structural characteristics of the 10M var HTS condenser are described, and the characteristics of the excitation winding are defined; Secondly, based on the characteristics of the excitation winding, a new design scheme of excitation power supply system is proposed: the scheme can achieve the separation of forced excitation module and constant excitation module, and the forced excitation module uses uncontrolled rectifier to provide high voltage and strong current; Constant excitation module uses four intersecting and staggered parallel buck circuit as low ripple power supply, which can not only ensure the speed of forced excitation, but also ensure the high precision requirements of constant excitation. Finally, Matlab / Simulink simulation software is used to verify the feasibility of the excitation system.

关键词： Resistance High-temperature superconductors Reactive power Power supplies Software packages Windings Rectifiers

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Short Circuit Calculation Method of Power System with Renewable Energy Sources and Experimental Verification

Short Circuit Calculation Method of Power System with Renewa...

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IEEE Conference on Energy Internet and Energy System Integration (EI2)

作者： Qinghua Lai Zhe Zhang Jiexiang Han Xianggen Yin State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781665434263

In the short-circuit current calculation of power grid, the renewable energy sources (RES) cannot use the equivalent method similar to the traditional synchronous generator because of the access mode and low voltage ride through control strategy. Therefore, it is difficult to solve the short circuit current directly by the traditional fault analysis method. According to the control strategy and fault characteristics of different types of RES, the equivalent calculation model of RES is obtained, especially the equivalent calculation model of doubly fed power sources when the negative sequence short-circuit current is not zero. On this basis, the node voltages equation and the iterative calculation method of the short-circuit current for the power grid with different types of RES are given. Then, an experimental platform with RES is established. The correctness of the equivalent calculation model and the iterative calculation method of short-circuit current are verified by short-circuit experiment.

关键词： Renewable energy sources Low voltage Short-circuit currents System integration Power grids Mathematical models Synchronous generators

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A Two-stage Electric Energy Scheduling Strategy for Pelagic Island Microgrid Clusters

A Two-stage Electric Energy Scheduling Strategy for Pelagic ...

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IEEE Asia Power and Energy engineering Conference (APEEC)

作者： Quan Sui Fanrong Wei Xiangning Lin Zhengtian Li State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

Electric vessels (EVs) can achieve interisland energy transmission among pelagic island microgrid clusters (PIMGCs) by charging or discharging. However, the renewable generation uncertainties may impact the operational economy of PIMGGs integrating EVs. To address the problem, this paper proposes a two-stage electric energy scheduling strategy. First, by analyzing the power regulation and sailing characteristics of an EV, an interisland spatial-temporal energy transmission model is established. Additionally, a two-stage electric energy scheduling model integrating the network constraints is proposed, where the day-ahead stage optimizes the EV travel trajectory decisions, and the intra-day stage manages the unit and EV power using the model prediction control (MPC) method. On this basis, this optimization model is converted into a classic mixed-integer second-order cone programming (MI-SOCP) problem, and efficiently solved by commercial solver. Simulation studies on pelagic islands in South China Sea indicate that the proposed scheduling strategy is effective and beneficial for PIMGCs.

关键词： Reactive power Uncertainty Power supplies Simulation Microgrids Predictive models Programming

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Uninterrupted Ice Melting technology Based on Zero-sequence Reactance Integrated Device

Uninterrupted Ice Melting Technology Based on Zero-sequence ...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Fan Zhou Guangyi Zhang Chun Song Dayi Li Xiong Xie Weiyu Wang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

In this article, the integrated device of zero sequence reactance consists of the grounding reactor and adjustable reactor. A set of on-line ice melting device is designed and a grounding transformer model is constructed in ANSYS software to verify the feasibility of the ice melting device. The results show that the device can make use of Joule heat generated by zero sequence current to deice the conductor.

关键词： Three-dimensional displays Grounding Simulation Transformer cores Transformers Ice Software

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Ranging backup protection scheme adapted to photovoltaic inverter control strategy in grid-connected scenarios

Ranging backup protection scheme adapted to photovoltaic inv...

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Energy, Power and Grid (ICEPG), International Conference on

作者： Jin Zhang Yingying Wang Xiangwen Chen Zhao Li Wenhao Wu Xiangning Lin Central China Branch of State Grid Corporation of China Wuhan Hubei Province China Lamor Innovation Studio of Liu Huanzhang Wuhan Hubei Province China College of Electrical Engineering and New Energy China Three Gorges University Yichang Hubei Province China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798350377798

ISBN: (纸本)9798350377804

Large-scale photovoltaic grid connection will bring serious challenges to the adaptability of traditional relay protection, and distance protection is the first to bear the brunt due to its weak feeding effect. In this regard, this paper made the following improvements to the traditional distance protection scheme. For the protection of the large grid side, based on the negative and zero sequence networks under faults, a short-circuit impedance algorithm independent of the transition resistance size was constructed to solve the fault distance by using the sequence current conditions constructed by the negative sequence current suppression strategy of the photovoltaic field station side and the zero sequence current branching coefficients which were not affected by the control strategy of the photovoltaic inverter. When the protection on the grid side recognizes that the fault occurred in the zone and tripped the breakers, the feeding effect on the fault point disappeared and the virtual synchronizer control strategy was used on the photovoltaic field station side to ensure safe and stable operation during the fault. The protection can thus solve the short-circuit impedance triangle formed by the impedance relay, and then realize the calculation of the short-circuit impedance. The simulation results based on PSCAD/EMTDC show that the proposed scheme eliminates the effect of transition resistance, has high-ranging accuracy, can protect the full length of the line, can act as backup protection in scenarios where the pilot protection is not applicable due to communication failure, and has the role of fault ranging.

关键词： Resistance Photovoltaic systems Grounding Simulation Protective relaying Distance measurement Inverters Impedance Synchronization Protection

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Mn4+activated phosphors in photoelectric and energy conversion devices

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能源化学 2023年第11期86卷 277-299页

作者： Yang Ding Chunhua Wang Lang Pei Qinan Mao Sateesh Bandaru Runtian Zheng Soumyajit Maitra Meijiao Liu Li-Hua Chen Bao-Lian Su Jiasong Zhong College of Materials and Environmental Engineering Hangzhou Dianzi UniversityHangzhou 310018ZhejiangChina School of Energy and Environment City University of Hong KongKowloon 99077Hong KongChina Laboratory of Inorganic Materials Chemistry(CMI) University of Namur61 rue de Bruxelles B-5000NamurBelgium Department of Materials University of OxfordOxford OX1 3PHUK School of Chemistry and Chemical Engineering Zhejiang Sci-Tech UniversityHangzhou 310018ZhejiangChina State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina Laboratory of Inorganic Materials Chemistry(CMI) University of Namur61 rue de Bruxelles B-5000NamurBelgium State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina

Owing to their high luminous efficiency and tunable emission in both red light and far-red light regions,Mn4+ ion-activated phosphors have appealed significant interest in photoelectric and energy conversion devices such as white light emitting diode(W-LED),plant cultivation LED,and temperature *** to now,Mn4*has been widely introduced into the lattices of various inorganic hosts for brightly red-emitting ***,how to correlate the structure-activity relationship between host frame-work,luminescence property,and photoelectric device is urgently *** this review,we thor-oughly summarize the recent advances of Mn4+doped ***,several strategies like co-doping and defect passivation for improving Mn4+ emission are also *** importantly,the relationship between the protocols for tailoring the structures of Mn4+doped phosphors,increased luminescence performance,and the targeted devices with efficient photoelectric and energy conversion efficiency is deeply ***,the challenges and perspectives of Mn4+doped phosphors for prac-tical applications are *** cordially anticipate that this review can deliver a deep comprehen-sion of not only Mn4+luminescence mechanism but also the crystal structure tailoring strategy of phosphors,so as to spur innovative thoughts in designing advanced phosphors and deepening the applications.

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