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检索条件"机构=Power Engineering and Automation Research Lab"

共 66 条记录，以下是11-20 订阅

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Fabrication, characterization and efficiency analysis of a piezoelectric (AlN) ring micro-resonator on Si for low-power resonant converters

Fabrication, characterization and efficiency analysis of a p...

引用

作者： Imtiaz, Abusaleh M. Khan, Faisal H. Walling, Jeffrey S. Power Engineering and Automation Research Lab Dept. of Electrical and Computer Engineering Univ. of Utah Salt Lake City United States Power-Efficient RF Electronic Circuits Lab Dept. of Electrical and Computer Engineering Univ. of Utah Salt Lake City United States

ISBN: (纸本)9781479940325

Piezoelectric microelectromechanical systems (MEMS) resonators on Si can be a potential candidate to replace discrete L-C components in series resonant converters. In this paper, ring shaped piezoelectric (AlN) micro-resonators on Si are reported. Having vibration in contour mode, these resonators can achieve resonant frequency as low as 87.28 MHz. Recently, we have fabricated high Q (>1000) piezoelectric resonator using a CMOS compatible fabrication process, and experimental characteristics of these devices are included in this paper. Contour mode AlN MEMS resonator with moderately low resonant frequency and motional resistance has been reported for the first time (the resonant frequency and motional resistance of the fabricated device is 87.28 MHz and 36.728 μ respectively). Finally, an efficiency analysis of the series resonant topology has been performed using the equivalent electrical circuit model of the resonator. © 2014 IEEE.

关键词： Resonators

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Variable-Gain GTSDC to Mitigate SSR in Turbine Generators Connected to Series-Compensated power Systems 10

Variable-Gain GTSDC to Mitigate SSR in Turbine Generators Co...

引用

10th Renewable power Generation Conference, RPG 2021

作者： Man, Jiufang Li, Yunhong Chang, Fujie Xie, Xiaorong State Key Lab. of Power System Department of Electrical Engineering Tsinghua University Beijing China North China Electric Power Research Institute Beijing China Beijing Sifang Automation Co. Ltd. Beijing China

ISBN: (纸本)9781839536069

The generator terminal subsynchronous damping controller (GTSDC) is the considerable option for subsynchronous resonance (SSR) problems in series-compensated transmission systems. However, considering the interaction between the large turbine generator and series compensation system, the transient torque amplification (TA) cannot be effectively suppressed by the GTSDC with a fixed gain due to the deferred-response characteristic, which limits the effectiveness of the conventional GTSDC to mitigate the transient torque when the transmission system failure occurs in the early stage. To address this issue, an improved GTSDC with the variable gain is proposed in this paper, which can rapidly improve the output capacity after the system fault occurs. Firstly, the influence of GTSDC on transient torque is analyzed. Then, the gain tuning is formulated as a constrained optimization problem, in which different operating conditions and disturbances are fully considered secondly. Finally, based on a practical series-compensated transmission system in the Xilin Gol League of China, the effectiveness of the improved GTSDC is verified. The result shows that the proposed GTSDC with variable gain can effectively mitigate the transient torque for the series-compensated transmission system. © The Institution of engineering and Technology.

关键词： Constrained optimization

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Reliability Analysis and Performance Degradation of a Boost Converter

Reliability Analysis and Performance Degradation of a Boost ...

引用

IEEE Energy Conversion Congress and Exposition

作者： Mohammed Khorshed Alam Faisal H. Khan Power Engineering and Automation Research Lab (PEARL) Dept. of Electrical and Computer Engineering University of Utah

ISBN: (纸本)9781479903375

In general, power converters are being operated in closed-loop systems, and any characteristic variations in one component will simultaneously alter the operating point of other components resulting in a shift in overall reliability profile. This interdependence makes the reliability of a converter a complex function of time and operating conditions;and therefore, the application may demand periodic replacement of converters to avoid downtime and maintenance cost. By knowing the present state of health and remaining life of a power converter, it is possible to reduce the maintenance cost for expensive high-power converters. This paper presents a reliability analysis for a boost converter although this method could be used to any power converter being operated in closed-loops. Through the conducted study it is revealed that the reliability of a boost converter with control loops degrades with time, and this paper presents a method to calculate time varying reliability of a boost converter as function of characteristic variations in different components in the circuit. In addition, the effects of operating and ambient conditions have been included in the reliability model as well. It was found that any increase in the ON-resistance of the MOSFET or equivalent series resistance (ESR) of the output capacitor decreases the overall reliability of the converter. However, any variation in the capacitance has more complex impact on the converter's reliability. This conducted research is a step forward to the power converter reliability analysis because the cumulative effect of multiple degraded components has been considered in the reliability model.

关键词： boost converters Converters Reliability analysis reliability model power conversion unit degradation of performance Health Status output capacitor CLOSED LOOP TIME FUNCTIONS Maintenance costs

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Transferable Neural Network Method Used for PMSM Permanent Magnet Temperature Estimation in Electrical Drive System

Transferable Neural Network Method Used for PMSM Permanent M...

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2024 Boao New power System International Forum - power System and New Energy Technology Innovation Forum, NPSIF 2024

作者： Zhang, Xiaotian Lang, Wangjie Zhao, Yiyang Gong, Chao Yantai Research Institute Harbin Engineering University Yantai China Research Center for Intelligent Equipment Zhejiang Lab Hangzhou China Guigang Power Supply Bureau CSG Guangxi Power Grid Co. Ltd. Guigang China School of Automation Northwestern Polytechnical University Xi'an China

ISBN: (纸本)9798331504557

Nowadays, electric drive systems are increasingly used in many industrial scenarios, especially in electric vehicles (EVs). Many permanent magnet synchronous motors (PMSMs) lack stable and accurate temperature monitoring and can only rely on expensive motor designs to ensure safe operation at high temperatures. Temperature monitoring using traditional thermal modeling methods requires workers to have strong expertise, such as the selection of a priori parameters. This paper proposes a transferable estimation method for the temperature of the permanent magnets (PMs) of the motor rotor. The domain adaptation module is added to the 1-D convolutional neural network (CNN) to realize the transfer function of the training model. Before the model pre-training stage, the generative adversarial network (GAN) technique is applied to data augmentation for improving the generalization ability of the pre-trained model. Since the training of the domain adaptation module does not require labeled data, the model can be migrated across multiple different motors and more accurately estimate the temperature of the PMs. The final experimental part verifies the accuracy of this method through the professional measured temperature data of the PMSM. The mean square errors of proposed method are under 0.51. © 2024 IEEE.

关键词： Mean square error

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A new approach of strip steel tempering and straightening in strip rolling

A new approach of strip steel tempering and straightening in...

引用

4th International Conference on Advanced engineering Materials and Technology, AEMT 2014

作者： Yu, Ji Lai Gu, Ting Quan Wang, Jian Guo Baosteel-NSC automotive steel sheets co. ltd Shanghai China Research Institute Baoshan iron and steel co. ltd Shanghai China School of Mechatronical Engineering and Automation Shanghai University Shanghai Key Lab of Power Station Automation Technology Shanghai China

ISBN: (纸本)9783038352068

This paper firstly analyzes the problems that exist in the cold rolling of steel industry. Secondly, a new approach is proposed to temper and straighten the strip steel based on the temper leveling mill, shortly, TLM. The required high quality of the wave, surface and mechanical properties can be achieved only with TLM. TLM holds the functions of both temper machine and straightening mill and can produce good quality strip steel, no only the waviness, mechanical properties, but also the surface quality. The usage of TLM can lower the cost of the production of tempering, straightening and equipment investment. Finally, the experiments are done and verify the validity of the approach. © (2014) Trans Tech Publications, Switzerland.

关键词： Cold rolling

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An automatic control strategy of strip width in cold rolling

An automatic control strategy of strip width in cold rolling

引用

4th International Conference on Advanced engineering Materials and Technology, AEMT 2014

ISBN: (纸本)9783038352068

This paper proposes an automatic control strategy of the strip width in cold rolling process. The prediction model for the exit strip width of each stand is established. In addition to the strip width variation of the incoming hot-rolled material between the measured and the pre-set values, the variations of the rolling force, tension, bending force and the roll shift amount of each stand are utilized to model and forecast the stand exit width deformation. Then, the model can be used to determine the compensation values of the different profile adjustment mechanism and the exit strip width can be controlled in high accuracy. In this way, the effect of the strip width variation of the incoming hot-rolled material and the fluctuation of the stand rolling process parameters on the exit strip width can be eliminated. Moreover, the feed-forward control of the strip width can reduce the incidence of abnormal situation, such as the strip breakage and off-tracking, and improve the stability of the cold rolling process. © (2014) Trans Tech Publications, Switzerland.

关键词： Cold rolling

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research on EV charging load response management method based on short-term prediction results

Research on EV charging load response management method base...

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2024 IEEE Transportation Electrification Conference and Expo, Asia-Pacific, ITEC Asia-Pacific 2024

作者： Pang, Songling Zhao, Yunan Ge, Ganheng Tang, Jinrui Peng, Yong Electric Research Institute Of Hainan Power Grid Co. Ltd Tropical Smart Grid Lab Haikou China Wuhan University Of Technology School Of Automation Wuhan China China Power Engineering Consulting Group Central Southern China Electric Power Design Institute Co. Ltd Wuhan China

ISBN: (纸本)9798331529277

An electrical vehicle (EV) charging load response management method based on short-term load forecasting results is proposed and discussed in this paper. Firstly, each user in the region makes an online reservation for their respective desired charging time and charging duration. And then, based on the signals submitted by all EVs in the region, the suggested charging start time for each EV is differentiated by considering the status of the EV's battery, the short-term forecasts of the charging load, and the response management objectives. After receiving the suggested time pushed by the system, each EV can voluntarily choose whether to accept the response management strategy or not. The proposed method fully coordinates the system optimization operation of the distribution network and EV charging behavior management. And the driver's participation is fully considered in the short-term EV charging load demand-side response process. The proposed method provides an important basic support for the system-level demand-side response regulation in the long-time scale. © 2024 IEEE.

关键词： Demand response

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Repeated Strike Process During Disconnector Operation in Ultra-High Voltage Gas-Insulated Switchgear

Repeated Strike Process During Disconnector Operation in Ult...

引用

作者： Guan, Yonggang Cai, Yuanji Chen, Weijiang Liu, Weidong Li, Zhibing Yue, Gongchang Zhang, Junmin State Key Lab of Control and Simulation of Power System and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing100084 China State Grid Corporation of China Beijing100031 China China Electric Power Research Institute Beijing100192 China School of Automation Science and Electrical Engineering Beihang University Beijing100191 China

Very fast transient over-voltage (VFTO), induced by disconnector operations in gas-insulated switchgears, has become the limiting dielectric stress at ultra-high voltage levels. Much work has been done to investigate single-strike waveforms of VFTO. However, little study has been carried out investigating the repeated strike process, which would influence VFTO significantly. In this paper, we carried out 450 effective experiments in an ultra-high voltage test circuit, and conducted calculations through the Monte Carlo simulation method, to investigate the repeated strike process. Firstly, the mechanism of the repeated strike process is proposed, based on the experimental results. Afterwards, statistical breakdown characteristics of disconnectors are obtained and analyzed. Finally, simulations of the repeated strike process are conducted, which indicate that the dielectric strength recovery speed and polarity effect factor have a joint effect on VFTO. This study enhances the understanding of the nature of VFTO, and may help to optimize the disconnector designed to minimize VFTO.

关键词： Monte Carlo methods

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Study on Robust Estimation of Combined Heat and power Networks based on Huber Estimation

Study on Robust Estimation of Combined Heat and Power Networ...

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2021 IEEE Sustainable power and Energy Conference, iSPEC 2021

作者： Hu, Yunlong Wang, Qi Ni, Ming Yang, Yi Zhu, Yongkang Yao, Xiecheng Nanjing Normal University College of Electrical and Automation Engineering Nanjing China Nari Group Corporation State Key Lab of Smart Grid Protection and Control Nanjing China State Grid Jiangsu Electric Power Research Institute Nanjing China

ISBN: (纸本)9781665414395

Combined heat and power state estimation is the basis for safety assessment, optimal dispatching and other functions in multi-flow energy management centers, and has important theoretical value and practical significance. The measurement system inevitably has gross errors or bad data. The traditional weighted least squares method can't restrain its influence, so the robust estimation method of combined heat and power network based on Huber estimation is proposed. The results of calculation examples show that the proposed method has good robustness and can restrain the influence of gross errors on the estimation accuracy. © 2021 IEEE.

关键词： Electric power transmission networks

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Design and Simulation of Contour mode MEMS Resonator on Si for power Converters

Design and Simulation of Contour mode MEMS Resonator on Si f...

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IEEE Workshop on Control and Modeling for power Electronics

作者： Abusaleh M. Imtiaz Faisal H. Khan Power Electronics and Automation Research Lab (PEARL) Dept. of Electrical and Computer Engineering Univ. of Utah

ISBN: (纸本)9781467349154

Microelectromechanical systems (MEMS) resonators on Si have the potential to replace the discrete passive components in a power converter. These devices not only can reduce the size and weight of the converter but also can facilitate the implementation of power converter on a chip. In this paper, a contour mode MEMS resonator has been presented that can achieve resonant frequency in the range of several MHz, and the operating principles of the device have been discussed in detail. This device was simulated in COMSOL Multiphysics, and a resonant converter has been simulated in PSIM to harvest energy from a thermo electric generator. The equivalent electrical model of the MEMS resonator was incorporated into that circuit validating the feasibility of using MEMS resonator in power conversion systems. Detailed fabrication process of the device has been presented and implemented at University of Utah's Nanofab. Initial experimental characteristics of the resonator have been included in the paper.

关键词： power conversion unit Resonator Device Component Microelectromechanical systems Silicon Converters simulating power CONVERSION SYSTEM resonant converter operating principles Energy sources frequency ranges contour Fabrication process resonant frequencies

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