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The Effect of Damper on the Dynamic Performance of Energy Storage Synchronous Condenser for Active Power 26

The Effect of Damper on the Dynamic Performance of Energy St...

引用

26th International Conference on Electrical Machines and Systems, ICEMS 2023

作者： Li, Xiaozhe Palanas, Patrick J. Chen, Xi Yu, Kexun Xie, Xianfei Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350317589

With the large-scale access of new energy units and the rapid development of power electronics in the power system, the problems of low inertia and limited voltage support capacity faced by the power system are becoming more and more serious. The renewed focus on synchronous condenser has improved the voltage support capacity of the grid, but the low inertia problem is still serious due to the fixed rotor speed and limited inertia. There is an urgent need for a device that meets both voltage and frequency support. Energy Storage Synchronous Condenser (ESSC) is considered as a solution. However, for the problem of command delay, the ESSC with damper enables frequency adjustment automatically and is a better solution. In this paper, the effects of different damping parameters on the dynamic performance of the ESSC for active power are analyzed theoretically and simulatively, respectively. The results show that the ESSC with damper has ideal dynamic performance if proper damping parameters are used. © 2023 IEEE.

关键词： Energy storage

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Analysis and Design of the Feedforward Strategy for Inverters in the Weak Grid with Sequence Impedance Model

Analysis and Design of the Feedforward Strategy for Inverter...

引用

2023 International Conference on Power Energy Systems and Applications, ICoPESA 2023

作者： Bai, Chenxi Peng, Te Song, Xuan Duan, Shanxu Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350345605

The weak grid has gradually become the conventional working environment for the existing distributed energy sources, and the instability caused by the interaction between the grid and the inverter has drawn much attention. For the actual grid- connected system, there are two significant control methods. One is the resonant controller, used to reduce the harmonics for the quality of grid current. The other is the grid voltage feedforward strategy, which is quite important for system stability and no inrush start-up. However, the system might become unstable if these two strategies are used together, since the grid voltage feedforward will cause the loss of phase margin at the resonant frequency of resonant controller. Therefore, a band-stop feedforward strategy is proposed to solve this contradiction while balancing the advantages of these two important strategies, which is carefully designed based on the sequence impedance model. An experimental platform is built to verify the effectiveness of the proposed method. © 2023 IEEE.

关键词： System stability

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Sensorless Control of Switched Reluctance Motor Based on Sliding Mode Observer Using Nonlinear Flux Linkage Model 26

Sensorless Control of Switched Reluctance Motor Based on Sli...

引用

26th International Conference on Electrical Machines and Systems, ICEMS 2023

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

ISBN: (纸本)9798350317589

This paper proposes an improved position sensorless control method for switched reluctance motor (SRM) based on a sliding mode observer (SMO) using nonlinear polynomial flux linkage model. Firstly, in order to balance the accuracy and complexity of SMO, a nonlinear polynomial flux linkage model with variable coefficients is introduced. Then, a modified SMO utilizing the switching function is designed to estimate rotor position and speed. Finally, comparison simulation results are presented to verify the accuracy and robustness of the proposed sensorless method. © 2023 IEEE.

关键词： Sensorless control

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Influence of the Fluctuating Input on Hydrogen Production by Alkaline Water Electrolysis

Influence of the Fluctuating Input on Hydrogen Production by...

引用

2023 IEEE Sustainable Power and Energy Conference, iSPEC 2023

作者： Ying, Yuheng Li, Hao Zhong, Zhiyao Huang, Danji Hu, Kewei Lu, Ang Fang, Jiakun State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9798350322699

Water electrolysis by renewable energy is a popular and promising solution for power-to-hydrogen. Conventional water electrolysis prefers DC voltage which needs converters and filters. However, the fluctuation cannot be completely eliminated and the effect of AC power on electrolyzers may not be entirely negative. In this paper, a multi-physics model for hydrogen production by alkaline water electrolysis has been built. Through the latency of bubble accumulation and the convexity of the I-V curve, it is been proved that the fluctuating input may have a positive effect on the hydrogen production. The transient process of the bubble accumulation has been elaborated. An integrated industrial system for hydrogen production by water electrolysis has been built for experiments. From the results, we conclude that dynamic process of the bubble on the electrode will affect the current dynamic process of the electrolyzer. The fluctuating input promotes the hydrogen production rate and reduces the energy conversion efficiency. In the specific case, a 0.7% loss in efficiency can bring 5.3% generation rate, which may be benefit for the industry. © 2023 IEEE.

关键词： bubbles power-to-hydrogen (PtH) voltage fluctuation water electrolysis

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Investigation of False Data Injection Attacks: A Simulation Implementation and Classical Countermeasure Perspective

Investigation of False Data Injection Attacks: A Simulation ...

引用

2023 Panda Forum on Power and Energy, PandaFPE 2023

作者： Wang, Ziyu Wang, Jingyu Shi, Dongyuan Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350321173

state Estimation (SE) is used to derive accurate operating states from redundant field measurements, wherein Bad Data Detection (BDD) is used to eliminate measurement outliers. In the past decade, False Data Injection (FDI) attacks have attracted extensive attention, as they provide a strategy to introduce bias to SE results by maliciously modifying measurements in a way that can bypass BDD. Regrettably, although FDI attacks are plausible in math, whether they are feasible in practice has not been paid enough attention. This paper tries to give an answer by formulating three FDI attack vectors, each exploiting the vulnerability of a different communication protocol to achieve background reconnaissance and data tampering. Based on the proposed attack vectors, the path of launching FDI attacks in a concrete cyber environment and the corresponding defense countermeasures are analyzed through cyber-physical co-simulation. Case studies demonstrate that applying classical countermeasures, such as cryptographic techniques and access control policies, can effectively frustrate FDI attacks in the real world. Futhermore, it can be summarized from the experiments that attackers may leverage side-effects of defense countermeasures to mount more subtle attacks. It is essential to consider defending against cyber-physical attacks from an overall perspective in the future. © 2023 IEEE.

关键词： state estimation

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A Generator Stator Ground Fault Location Method Based on Flexible Optical Current Transformer

A Generator Stator Ground Fault Location Method Based on Fle...

引用

2022 International Conference on Optoelectronic Materials and Devices, ICOMD 2022

作者： Qiao, Jian Guo, Jingrun Peng, Shuhao You, Junnan State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781510663268

For the large generators with different branch winding potential overlap, the existing stator ground fault location methods are difficult to determine the faulty branch. Therefore, this paper presents a novel fault location method based on the flexible optical current transformer. Based on the Faraday magneto-optical effect principle, the optical fiber reflection reciprocal interference technology is used to detect the rotation angle. The flexible optical current transformer is used to measure the equivalent zero-sequence current of each generator branch, and then the dynamic time warping distance (DTW) algorithm is used to compare the similarity of each zero-sequence current, to identify the correct faulty branch and achieve accurate grounding fault location. The simulation results verify the effectiveness of the proposed method, and the results are still reliable and sensitive when the transition resistance is 500 Ω. © 2023 SPIE.

关键词： Location

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Low-Frequency Passivity Characterization of Grid-Forming Inverter 2

Low-Frequency Passivity Characterization of Grid-Forming Inv...

引用

2nd IEEE International Power Electronics and Application Symposium, PEAS 2023

作者： Guan, Jingying Li, Shaojie Lin, Hua Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350313765

This paper focuses on the system stability of grid-forming (GFM) control through passivity criterion. An accuracy small-signal impedance model under dq-frame is established, which is used to analyze the influence of controller coefficients on system stability by passivity theory. And the inherent characterization for the risk of low-frequency resonance is revealed, indicating that its non-passivity region always exists, regardless of controller coefficients and specific control schemes. Finally, the theoretical analysis is verified by simulation results and the experiment test. © 2023 IEEE.

关键词： Grid-forming inverter low-frequency resonance passivity criterion system stability

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A Pre-disaster Optimal Maintenance Strategy for Distribution Networks to Confront Severe Convective Weather Considering Post-disaster Situations

A Pre-disaster Optimal Maintenance Strategy for Distribution...

引用

2024 IEEE China International Youth Conference on Electrical engineering, CIYCEE 2024

作者： Yao, Fuxing Miao, Shihong Wang, Tingtao Wang, Jiaxu Wang, Baisheng Tan, Haoyu School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Wuhan430074 China

ISBN: (纸本)9798331530174

The increasingly frequent severe convective weather poses a serious threat to the reliability of distribution networks. In this regard, an optimal maintenance model that considers pre-disaster defense and post-disaster mitigation stages is proposed to meet the demand for resilience enhancement. During the pre-disaster defense stage, the equipment maintenance plan and the corresponding operation strategy are decided in conjunction with the failure probability of each device. During the post-disaster mitigation stage, the emergency dispatch strategy of the grid is developed considering the diversity of damage results. On these bases, the optimal pre-disaster maintenance strategy considering post-disaster situations is identified by integrating the two stages' outage losses and operating costs. Finally, the numerical results show that the proposed strategy can give an optimal maintenance plan by combining the fragility of each device, which effectively improves the outage prevention and management capability of the distribution network under severe convective weather. © 2024 IEEE.

关键词： Operating costs

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Different Temperature Distributions During the Formation of Cathode Spot Crater in Vacuum Arcs 7

Different Temperature Distributions During the Formation of ...

引用

7th IEEE Conference on Energy Internet and Energy System Integration, EI2 2023

作者： Ye, Jingjing Yuan, Zhao Yang, Peixuan Chen, Lixue Liu, Liming Pan, Yuan Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350345094

The 2D axisymmetric model of crater with flowable heat transfer is combined with the mass, momentum, and heat transfer equations. However, it is considered that the initial cold cathode surface does not have current density. Under the new simulation condition of electric field, two typical distributions of temperature are obtained for different external parameters. At higher pressure relative to the heating efficiency, a distribution of temperature on droplet head much higher than the central area is formed. When the heating efficiency is large enough, the temperature of central area increases continuously, resulting in the same temperature as the metal droplet head. © 2023 IEEE.

关键词： Temperature distribution

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A Fast Analytical Dose Calculation Approach Based on RAMDIM in MR-Guided Proton Therapy 4

A Fast Analytical Dose Calculation Approach Based on RAMDIM ...

引用

4th International Conference on Electronic Information engineering and Computer technology, EIECT 2024

作者： Chen, Songbin Tan, Ping Xiong, Haimin Qian, Zhihong Tang, Dan School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Wuhan430074 China

ISBN: (纸本)9798331528850

In magnetic resonance-guided proton therapy, protons are deflected in magnetic fields, resulting in distortion of the dose distribution. In dose calculation, Monte Carlo simulation methods are highly accurate but time-consuming. Clinical dose validation requires a fast and accurate method to calculate the dose distribution. In this paper, a fast analytical dose calculation approach is proposed based on Raytracing Algorithm for Magnetic Deflection of Ions in Media. Different energies, different magnetic field strengths and different energy spreads are considered, and the γ-pass rates in all cases exceeds 98%. © 2024 IEEE.

关键词： Proton beam therapy

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