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IEEE International Conference on Smart Instrumentation, measurement and Applications (ICSIMA)

作者： Arsalan Habib Khawaja Qi Huang Libo Lian Sichuan Key Lab of Power System Wide-area Measurement and Control University of Electronic Science and Technology Chengdu China

This experimental investigation is focused to assess a Tunnel Magneto-Resistive (TMR) and Anisotropic Magneto-Resistive (AMR) sensor for power system magnetic field measurement applications as in current sensing, transmission line monitoring, detection and classification of Transient Magnetic Field (TMF) interference in substations. For measurement applications, AMR sensors have the limitations of low field range up to ±6 Gauss impractical for high magnetic field measurements, disorientation in sensitivity at exposure to field over ±20 Gauss recurrent in outdoor applications and high power consumption not appealing for portable devices. Thus, a complete testing system is established to identify if TMR sensors are a superior candidate for our application domain. For this, both of the sensors were exposed to uniform and transient magnetic field. Experimentation with identical conditioning circuitry confirms the superior performance of TMR sensor over AMR sensor in terms of twice the sensitivity, 200 times reduced power consumption and 5 times more field range. Additionally, in a TMF event, AMR sensor response depicts a time lag of 15 microseconds whereas TMR sensor only lags by 10 nanoseconds. Magnetic fields above field range of AMR sensor disorient the sensor until recalibrated; to cater for this a practical recalibration pulse blinds the sensor for 4 milliseconds once initiated.

关键词： Magnetic fields Magnetic field measurement Tunneling magnetoresistance Transient analysis power systems Monitoring

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Smart Grid Facing the New Challenge: The Management of Electric Vehicle Charging Loads

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Energy Procedia 2011年 12卷 98-103页

作者： Changhua Zhang Qi Huang Jiashen Tian Lei Chen Yongxing Cao Ran Zhang Sichuan Provincial Key Lab of Power System Wide-area Measurement and Control University of Electronic Science and Technology of China. Chengdu China Sichuan Electric Power Test & Research Institute Chengdu China

Because of the energy shortage, air pollution and greenhouse gas over mission, the plug-in electric vehicles can be looked as the alternative of the current fossil fuels vehicles. But PHEVs charging brings out the serious problem to the power systems security operation. Smart grid, with its flexible operation ways, is likely to solve this problem. This paper discusses the relationship between the smart grid and the PHEVs charging load. Then introduce the PHEVs influence on the power system based its different operation model. The third part presents the coordinated charging schedule model and in the last part, some core technologies to construct the communication net are also discussed.

关键词： Charging loads plug-in hybrid electric vehicles (PHEV) smart grid zigbee

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Separated Double-Layer Magnetic Shielding with Magnetic Sensor for Large Current measurement

Separated Double-Layer Magnetic Shielding with Magnetic Sens...

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2018 International Conference on Innovative Smart Grid Technologies, ISGT Asia 2018

作者： Chen, Yafeng Huang, Qi Khawaja, Arsalan Habib Sichuan Provincial Key Lab of Power System Wide-Area Measurement and Control School of Energy Science and Engineering University of Electronic Science and Technology of China Chengdu China U.S.- Pakistan Center for Advanced Studies in Energy National University of Sciences and Technology Islamabad Pakistan

ISBN: (纸本)9781538642917

One drawback of contactless current measurement by magnetic sensor is that its detected results can be easily affected by the superposition of the external magnetic interference. Damping the effect of the noise is complex and delicate without the knowledge of the interference. The usage of magnetic shielding is one potent way to compensate the shortcoming. However, complete magnetic shielding fails to provide the shielding for the shielding only happens within the material. Therefore, in this paper, a separated double-layer structure with the gap is proposed for large current measurement with strong magnetic noise from random places. The ambition is to keep the targeted magnetic field within the shielding stable even when exposed to strong magnetic interference environment. Parameters of the designed structure are investigated and the validation of the structure is confirmed by finite element analysis method when the magnitude of the current under measurement ranging up to 1000 A. From FEA method, when the interference is at arbitrary places around the conductor, the standard deviation without and with noise is less than 0.13, authenticating the efficacy of this shielding structure. © 2018 IEEE.

关键词： Magnetic sensors

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Evaluation of the effect of modal interaction higher than 2nd order in small-signal analysis

Evaluation of the effect of modal interaction higher than 2n...

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IEEE General Meeting power& Energy Society

作者： Qi Huang Zhouqiang Wang Changhua Zhang Key Laboratory of Power System Wide-area Measurement and Control University of Electronic Science and Technology Chengdu Sichuan China

This paper attempts to obtain insight about the effect of modal interaction of higher than 2 nd order in small-signal analysis, through evaluating the effect of 3 rd order modal interaction. The indices that quantify the 3 rd order modal interaction are defined, following the modal analysis procedures used in linear modal analysis and second order modal analysis. Numerical simulation results demonstrates that, there are definitely modal interaction higher than 2 nd order, and with further higher order modal analysis, it is possible to detect more information about modal interaction, which might be useful in power system control.

关键词： power system dynamics power system modeling power system analysis computing power system control Modal analysis power system stability power systems power system interconnection Nonlinear dynamical systems Numerical simulation

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Development of a tool for the analysis of power system higher order oscillation

Development of a tool for the analysis of power system highe...

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IEEE General Meeting power& Energy Society

作者： Zhouqiang Wang Qi Huang Changhua Zhang Sichuan Provincial Key Laboratory of Power System Wide-area Measurement and Control University of Electronic Science and Technology Chengdu Sichuan China

The analysis of higher order modal interaction attracts much attention from scholars all over the world. The normal form theory and the modal series method offer new ideas for solving these problems. However, literature review and simulation show that modal analysis for a certain case with these approaches may obtain different results. In this paper, the currently available methods are integrated into a tool PSMAT (power system modal analysis tool), so that one can compare the results with different approaches, and then select the most appropriate method for his analysis purpose. The developed tool has all the functionalities in modal analysis as well as the quantitative indices. The design of the tool is described and case studies are presented. The results obtained with this tool are discussed. It is verified that this tool is effective, in both modal analysis and comparison of the approaches.

关键词： power system analysis computing Modal analysis power system modeling power system simulation power system stability power system interconnection Taylor series Signal analysis Performance analysis Equations

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A new assessment method to voltage vulnerability within the static energy frame

A new assessment method to voltage vulnerability within the ...

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IEEE General Meeting power& Energy Society

作者： Qunying Liu Qifang Liu Qi Huang Sichuan Provincial Key Lab of Power System Wide-area Measurement and Control UESTC Chengdu China GUODIAN Sichuan Ashine Power Company Limited Chengdu China

ISBN: (纸本)9781424465491

Voltage vulnerability has been important in power system security research. Considering the characteristic that the voltage are mainly influenced by the reactive power, the potential energy margin which can embody the impacts from the reactive load, the reactive output of generator, the reactive compensation, and so on, was proposed as the benchmark, and then, the degree index and the trend index of voltage vulnerability were derived, the impacts of grid topology and the reactive power inject ingredients on the voltage vulnerability were discussed. On this base, the assessment index of branch vulnerability was proposed to compute the distance of the current value of branch transmission to the initial value and ascertain the vulnerable area. In IEEE-30bus system, the feasibility and exactness of this method are identified by the simulation.

关键词： Indexes Reactive power Potential energy Equations Generators Mathematical model Production

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Design of an adaptive on-load de-icing scheme for overhead power transmission line

Design of an adaptive on-load de-icing scheme for overhead p...

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IEEE General Meeting power& Energy Society

作者： Qi Huang Yong Chen Changhua Zhang Sichuan Provincial Key Laboratory of Power System Wide-area Measurement and Control University of Electronic Science and Technology Chengdu Sichuan China

This paper reports part of the results in the project to develop an on-load de-icing system. In the system, a high frequency high voltage excitation with adjustable frequency, is used to de-ice the ice covered on long power transmission line. The system is highly efficient in de-icing due to the joint heating effect brought by transmission line loss and dielectric loss. The mathematical model of the system is developed. And on the basis of analysis and numerical simulation results, an adaptive scheme is designed. In the system, networked sensors are deployed to monitor the ice condition on transmission line, and on-line regulate the frequency of the high-voltage excitation according to the monitored ice information, to ensure that there is no severe ice-covering spot on long transmission line.

关键词： power transmission lines Frequency Ice Dielectric losses Propagation losses Condition monitoring Voltage Heating Mathematical model Numerical simulation

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A DLL-based Router Scheme for the Process-layer Network in Smart Substations 5

A DLL-based Router Scheme for the Process-layer Network in S...

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5th IEEE International Conference on Electronics Technology, ICET 2022

作者： Guo, Rui Zheng, Ai Huang, Qi Sun, Huabo Chen, Lei Beijing Microelectronics Technology Institute Fpga Department Beijing China Smart Network Innovation Center China United Network Communications Limited Beijing China University of Electronic Science and Technology of China Sichuan Provincial Key Lab of Power System Wide-area Measurement and Control Chengdu China

ISBN: (纸本)9781665485081

With the extensive utilization of Intelligence Electronic Devices (IED), the modern smart substation is regard of a typical Internet of Things (IoT) system. The process-layer network in smart substations, which carries the measurements and control signals, needs to operate reliably in the face of unforeseen failures and external malicious attacks. In this paper: i) a mathematical framework for the process-layer network, attacks, and signals is modeled;ii) fundamental network performance limitations from system-theoretic and graph-theoretic perspectives are characterized;and iii) A DLL-based Router Scheme (DRS) is designed to ensure the network performance for the effective operation of IoT. Finally, we validate our design through a series of cases, and the results show that the designed DRS is effective to smooth the network performance. © 2022 IEEE.

关键词： Internet of things

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A Two-Stage Robust Scheduling Strategy for Multi-Energy Microgrid Considering Multiple Uncertainties 8

A Two-Stage Robust Scheduling Strategy for Multi-Energy Micr...

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8th International Conference on power Energy systems and Applications, ICoPESA 2024

作者： Zhang, Sen Hu, Weihao Cao, Xilin Zhao, Yincheng Liu, Rundong Ma, Haojie Zhan, Wei Li, Mingxuan School of Mechanical and Electrical Engineering University of Electronic Science and Technology of China Sichuan Provincial Key Lab of Power System Wide Area Measurement and Control Chengdu China School of Management and Economics Beijing Institute of Technology Beijing China SPIC Southwest Energy Research Institute Chengdu China

ISBN: (纸本)9798350351668

To achieve the economic operation of a multi-energy micro grid under multiple uncertain environments, this study introduces a novel two-stage robust scheduling approach, encompassing both day-ahead planning and real-time adjustments. First, the multi-energy micro grid day-ahead economic dispatch model is constructed based on the prediction scenarios, and integrated demand response is considered to increase the flexibility of the system. Afterwards, the strategy is adjusted in the real-time phase, considering the uncertainty of energy production and consumption. The Column-and-Constraint Generation algorithm is employed to resolve the above two-stage issues effectively, and the optimal economic operation strategy of the MEMG is obtained. Finally, a case study demonstrates the economy and robustness of the proposed methodology. © 2024 IEEE.

关键词： Demand response

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DC Bus Voltage Regulation for Distributed Energy Sources through Buck-Boost Converter in a Direct Current Micro Grid

DC Bus Voltage Regulation for Distributed Energy Sources thr...

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2019 IEEE PES Innovative Smart Grid Technologies Asia, ISGT 2019

作者： Solangi, Asif Raza Huang, Qi Raza, Ghalib Abbas, Muneer Solangi, Siraj Hyder Sichuan Provincial Key Lab of Power System Wide -Area Measurement and Control School of Mechanical and Electrical Engineering University of Electronic Science and Technology of China China Benazir Bhutto Shaheed University of Technology and Skill Development Khairpur Pakistan Indus University Karachi Pakistan University of Sindh Jamshoro Pakistan

ISBN: (纸本)9781728135205

Direct current micro-grid (DCMG) based on renewable energy sources (RES) is facing an issue of maintaining standard voltage at DC bus under variable power generation and utilization. This paper proposes the DCMG based on distributed energy sources (DES) and buck-boost converter to maintain standard voltage at DC bus. Photovoltaic panel (PV), wind turbine (WT) and battery are utilized as DES. PV, battery and WT are linked to DC bus through buck-boost converter. The simulation model of PV and WT has been developed using MULTISIM simulation tool. To measure the performance of the designed system, the DC load of 500 watt has been organized for DCMG system. The protection from reverse current flow and over voltage is also provided. The simulation outcomes verified that, at DC bus standard voltage has been maintained for both utilization and generation. © 2019 IEEE.

关键词： Wind turbines

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