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检索条件"机构=Sichuan Provincial Key Laboratory of Power System Wide-Area Measurement and Control"

共 71 条记录，以下是41-50 订阅

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Performance Analysis Of Parallel Inverter Based On Virtual Oscillator control

Performance Analysis Of Parallel Inverter Based On Virtual O...

引用

IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia)

作者： Xueting Shi Qi Huang Shi Jing Jianbo Yi 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(UESTC) China

ISBN: (纸本)9781538642924

In this paper, by improving the control strategy of virtual oscillator, a non-linear model for stability analysis is established, and a solution to the circulation problem in parallel system is proposed. The external equivalent of the virtual oscillator is the RLC resonant circuit. In this paper, through digital programming, the module is established with dual characteristics of controllable current source and controllable resistor, in which non-linear control is introduced. Through the phase-locked loop to feedback the phase change of the current and voltage in the line, it eliminates the circulating current brought by the parallel operation of the inverters. In this paper, Simulink simulation is used to control the parallel operation of two inverters with the same capacity and without interconnecting multiple lines. By conducting an experiment of voltage and current stability in the case of load-mutation, and conducting an experiment of circulating current suppression in the line with inductance is carried out to verify the feasibility of the system plan.

关键词： Oscillators Inverters Voltage control Resistors Impedance Mathematical model Asia

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Separated Double-Layer Magnetic Shielding With Magnetic Sensor For Large Current measurement

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

引用

IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia)

作者： Yafeng Chen Qi Huang Arsalan Habib Khawaja 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)9781538642924

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.

关键词： Interference Magnetic shielding Magnetic sensors Magnetic fields Magnetic noise Current measurement Conductors

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Characteristic estimation of high voltage transmission line conductors with simultaneous magnetic field and current measurements

Characteristic estimation of high voltage transmission line ...

引用

IEEE Instrumentation and measurement Technology Conference

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

ISBN: (纸本)9781467392211

Sag and galloping poses serious issues for uninterrupted operation of overhead high voltage transmission lines (HVTLs) under extreme weather conditions. This paper presents a novel approach to detect and estimate the change in sag and galloping alongside its feature characteristics (amplitude, frequency and degree of rotation). These parameters are estimated by means of magnetic field measurement with a sensor installed at support tower, and phase current measurement at the substation. It is observed that a variation in sag and conductor galloping induces a variation of magnetic field at sensor for same current amplitude. To this effect, galloping motion and magnetic field emanated from phase conductors during motion is first simulated. Then, two robust algorithms are designed to compare the simulated and measured magnetic fields to detect and quantify the change due to sag and galloping motion. This paper used empirical means to optimize our algorithms which are derived from integration solution provided by Biot-Savart law for magnetic field calculation of current carrying conductors. This reduces computational time for each iteration by 19e4 with error bounds well within the range of IEEE-644 Standard. The algorithms are validated by numerical simulations under various operating conditions.

关键词： Conductors Poles and towers Transmission line measurements Current measurement Substations power transmission lines Global Positioning system

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The design and implementation of visualized function correlation for secondary system in smart substation 5

The design and implementation of visualized function correla...

引用

5th International Conference on Smart Grid and Clean Energy Technologies, ICSGCE 2015

作者： Ren, Manman Huang, Qing Jing, Shi Sichuan Provincial Key Lab of Power System Wide-area Measurement and Control Chengdu China

ISBN: (纸本)9781467387347

In smart substation, the interrelationship among different devices is complex. The information in a smart substation is not transmitted through point to point communication, but through a novel communication network. Existing auxiliary systems for maintenance and inspection in intelligent substation cannot visualize the flow of packets in the implementation of specific function in secondary system. This paper, by analyzing the contents and requirements for maintenance and inspection in intelligent substation, designs a visualized function correlation. The function correlation library is built based on the principle of relay protection and expert experience. This library can show the interrelationship of the packets, when one specific function is triggered during the normal operation of substation, Sugiyama algorithm is used to illustrate the complete process of this function implementation. © 2015 IEEE.

关键词： Packet networks

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Experimental study of Tunnel and Anisotropic Magnetoresistive sensor for power system magnetic field measurement applications 3

Experimental study of Tunnel and Anisotropic Magnetoresistiv...

引用

3rd IEEE International Conference on Smart Instrumentation, measurement and Applications, ICSIMA 2015

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

ISBN: (纸本)9781467372558

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. © 2015 IEEE.

关键词： Anisotropy

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Experimental study of Tunnel and Anisotropic Magnetoresistive sensor for power system magnetic field measurement applications

Experimental study of Tunnel and Anisotropic Magnetoresistiv...

引用

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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The Design and Implementation of Visualized Function Correlation for Secondary system in Smart Substation

The Design and Implementation of Visualized Function Correla...

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International Conference on Smart Grid and Clean Energy Technologies

作者： Manman Ren Qing Huang Qi Huang Shi Jing Sichuan Provincial Key Lab of Power System Wide-area Measurement and Control

ISBN: (纸本)9781467387729

关键词： Smart substation Function correlation library SCD files Network packets Sugiyama algorithm

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Design of a Mean Filter Algorithm for Phase Difference measurement Based on Fourier Transform

Design of a Mean Filter Algorithm for Phase Difference Measu...

引用

International Conference on Smart Grid and Clean Energy Technologies

作者： Gen Su Qi Huang Huan Liu Xinbao Wu Sichuan Provincial Key Lab of Power System Wide-area Measurement and Control

ISBN: (纸本)9781467387729

Because of non-coherent sampling, Fourier transform when used for the measurement of phase difference is insufficient in terms of the accuracy and real-time. This paper starts with the analysis of the relationship among the phase difference error, the frequency skew and the true phase difference. Then a mean filter algorithm, which can eliminate the phase difference error as far as possible by taking advantage of the symmetry of the function, is proposed. Comparing with traditional Fourier transform based phase difference measurement algorithm, the proposed algorithm can filter out the error well, improving the accuracy of phase difference measurement.

关键词： Asynchronous sampling Phase difference measurement Fourier transform Mean filter Phase difference error

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Study on an improved Normal Form solution and reduced-order mode reconstruction in power system

Study on an improved Normal Form solution and reduced-order ...

引用

IEEE Region 10 International Conference TENCON

作者： Zhouqiang Wang Qi Huang Sichuan Provincial Key Lab of Power System Wide-area Measurement and Control University of Electronic Science and Technology of China (UESTC) Chengdu Sichuan China Dept. of Electrical Engineering Sichuan Engineering Technical College (SCETC) Deyang Sichuan China University of Electronic Science and Technology of China Chengdu CN

ISBN: (纸本)9781479986422

With the polynomial vector space decomposition by using Normal Form theory, the normalized analytical solutions of modal resonance are derived, which solves that the traditional Normal Form solution cannot be easily obtained under resonant condition. Based on the solution, from the viewpoint of whether the modal interaction couples and resonates or not, the nonlinear terms are decomposed into four types, i.e., uncoupled nonresonant terms, coupled nonresonant terms, uncoupled resonant terms and coupled resonant terms. The corresponding modes are categorized into 5 types, i.e., single modes, uncoupled nonresonant modes, coupled nonresonant modes, uncoupled resonant modes and coupled resonant modes. A reduced-order mode reconstruction based on least square method to estimate the coefficients of higher-order interactional modes is proposed. This might be potentially a new approach to cope with the challenge from huge amount of higher-order modes in higher-order nonlinear analysis. Two case studies are presented to analyze the types and reconstructions of the nonlinear modes, 2nd- and 3rd- order terms, which verifies the effectiveness of the proposed approach.

关键词： Mathematical model power system dynamics Yttrium Couplings Least squares methods Eigenvalues and eigenfunctions

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Research on Storage system Capacity of Distributed Wind power Based on Prediction Error Compensation

Research on Storage System Capacity of Distributed Wind Powe...

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International Conference on Smart Grid and Clean Energy Technologies

作者： Wen Yin Min Zhao Chao Wang Luan Chen Sichuan Provincial Key Lab of Power System Wide-area Measurement and Control University of Electronic Science Technology of China

ISBN: (纸本)9781467387729

According to the theory that wind power prediction error approximatively follows a normal probability distribution, this article introduces a concept of error tolerance rate of wind power prediction, and comes to the relationship between the capacity of energy storage system (ESS) and error tolerance rate. Furtherly, the relationship between the size of the storage capacity and the economic costs, as well as the relationship between the size of storage system capacity and some other factors that may affect the security and stability of grid, are explored. The results can guide to configure an appropriate capacity of the energy storage system under a reasonable error tolerance rate, so to ensure the safety and stability of grid and the economy can be simultaneously optimized to some extent.

关键词： Wind power forecasting Storage capacity Error tolerance rate Safety Economy

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