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Static Stable Working Zone of Grid-Connected Converter Connecting with Synchronous Generator

Static Stable Working Zone of Grid-Connected Converter Conne...

引用

2020 IEEE/IAS Industrial and Commercial Power System Asia, I and CPS Asia 2020

作者： Chen, Songbai Lin, Xinchun Zheng, Yun Liu, Wenbin Guo, Xiaoshun Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (数字)9781728143033

ISBN: (纸本)9781728143033

Grid-connected converter (GCC) and synchronous generator (SG) are important power interface devices in grid-connected power generation systems. The coupling between GCC and SG under weak grid conditions directly affects the static stability of the power system. In this paper, for the two-machine system composed of renewable-energy grid-connected converter and SG, the static stability and static limit power under weak grid conditions are studied. Firstly, starting from the basic working principles of GCC and SG, the mathematical models are established. Secondly, based on the fundamental frequency equivalent circuit of the two-machine system, the output active power characteristics of GCC and SG are studied. On this basis, the eigenvalue analysis method is used to derive the static stability criterion of the system and the constraint relationship of the static limit power between GCC and SG. Finally, the correctness of theoretical analysis is verified by Matlab/Simulink simulation. © 2020 IEEE.

关键词： Synchronous generators

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An Optimzed Parameter Design Method for Desaturation Protection Circuits towards Fast Response and Strong Noise Immunity

An Optimzed Parameter Design Method for Desaturation Protect...

引用

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

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

引用

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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Datasheet Driven Turn Off Overvoltage Prediction for Silicon Carbide Power MOSFETs Based on Theoretical Analysis

Datasheet Driven Turn Off Overvoltage Prediction for Silicon...

引用

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

作者： Cheng Qian Yuxin Ge 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 turn-off overvoltage prediction method for silicon carbide (SiC) MOSFETs based on theoretical analysis. First, the trajectory method is used to analyze the turn-off process and the key parameters associated with turn-off overvoltage are identified. Second, several reasonable assumptions are introduced to simplify the derivation. A quadratic equation containing power loop inductance, load current, gate resistance, transconductance and other parameters from datasheet is obtained. Third, experiments are presented to validate the proposed method. It is found that the prediction values are always larger than experimental values and the prediction error is within 15%. The prediction is always conservative, which is acceptable for safety concerns.

关键词： Resistance MOSFET Silicon carbide Asia Prediction methods Trajectory Safety

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Experimental Study of Fiber Bragg Grating Applied on Quench Detection of HTS Tapes

Experimental Study of Fiber Bragg Grating Applied on Quench ...

引用

2020 IEEE International Conference on Applied Superconductivity and electromagnetic Devices, ASEMD 2020

作者： Zhou, Kao Ren, Li Shi, Jing Xu, Ying Duan, Pu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781728152158

The quench detection of high temperature superconducting (HTS) tapes based on fiber Bragg grating (FBG) was investigated. It is found that the multi-peak phenomenon of FBG at cryogenic temperature can be eliminated by using epoxy adhesive to fix the FBG. A quench experiment was performed on a 20 cm long HTS tape with voltage taps and FBG. The experimental results show that the FBG quench detection is much faster than the quench voltage signal, which has great significance for the quick quench detection and protection of HTS power devices. © 2020 IEEE.

关键词： Fiber Bragg gratings

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Transient Stability Analysis of Grid-Connected Converter under Remote Voltage Sag with Reactive Power Compensation Devices

Transient Stability Analysis of Grid-Connected Converter und...

引用

2020 IEEE/IAS Industrial and Commercial Power System Asia, I and CPS Asia 2020

作者： Pan, Chen Lin, Xinchun Quan, Xuli Zheng, Yun Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9781728143033

The renewable energy system and power grid are usually connected through a grid-connected converter (GCC), whose transient performance is significantly essential during the grid faults. In actual operation, reactive power compensation devices are often connected to the common coupling point (PCC) to improve voltage stability. However, there is a lack of analysis when considering the influence of reactive power compensation devices on GCC's transient stability. In this paper, the mathematical model of GCC when static var generator (SVG) is adopted for reactive power compensation is established. The AC-side equivalent circuit of the system, the state equation and the output power characteristic curve of GCC are obtained. On this basis, the equal-area criterion (EAC) for GCC is proposed to analyze its transient stability. Finally, the simulation of remote voltage sag under different short circuit ratio (SCR) is carried out to verify the correctness of the theoretical analysis. © 2020 IEEE.

关键词： Stability

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Principle and Implementation of Networked Protection in Active Distribution Networks

Principle and Implementation of Networked Protection in Acti...

引用

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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Protection CT Polarity Checking Method for MMC-HVDC Converter Station Transformer

Protection CT Polarity Checking Method for MMC-HVDC Converte...

引用

Power and Electrical engineering (ACPEE), 5th Asia Conference on

作者： Binyan Liu Xianggen Yin Yuanlin Pan Maolin Wang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

Aiming at the difficulty of CT polarity checking of MMC-HVDC converter station transformer, a method for CT polarity checking based on waveform comparison and instantaneous power theory is proposed. The transient current during the process of the converter transformer and the converter valve charging is analyzed, and the polarity of the zero-sequence differential protection and the longitudinal differential protection is checked by comparing the crossing transient current on both sides of the protection based on the longest common subsequence (LCSS) distance. At the same time, the instantaneous active power during the converter valve deblock is used to check the polarity of directional protection. This method can not only check the polarity of longitudinal differential protection and zero-sequence differential protection, but also can check the polarity of directional protection, and the reversed phase of CT can be found out. Moreover, it can withstand a certain degree of ratio error and phase error of CT. The simulation verifies the effectiveness and applicability of the method.

关键词： Electrical engineering Sensitivity Asia Valves Transient analysis

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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...

引用

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

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

引用

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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