The Experts below are selected from a list of 42195 Experts worldwide ranked by ideXlab platform
Gehan Amaratunga - One of the best experts on this subject based on the ideXlab platform.
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real time grid Impedance Measurement of three phase micro grid system in d q frame using quadratic residue ternary sequence qrts
IEEE International Future Energy Electronics Conference, 2019Co-Authors: Srinivasarao Kamala, Sanjib K. Panda, Gehan AmaratungaAbstract:Thee-phase micro-grid systems with tightly regulated power converters are prone to interactions and causes small signal instability. The regulated converters behave like constant power loads (CPLs), and cause instability. Adaptive controllers can be used to ensure stable operation of the system, and the controllers require real-time grid Impedance Measurement. In this paper, a computationally effective Impedance Measurement technique using the Quadratic Residue Ternary Sequence (QRTS) has been proposed. The QRTS signal is a class of Pseudo Random Binary Sequence (PRBS), which is used for system identification in control engineering. The proposed signal has low crest factor compared to the conventional Newman’s multi-sine signal. The effectiveness of the proposed Impedance Measurement technique using QRTS signal has been tested in MATLAB/Simulink simulation environment for a three-phase micro-grid system. The results have been validated with the conventional Newman’s multi-sine perturbation, and results shows that the QRTS is an effective perturbation method to measure real-time grid Impedance.
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Small Signal Stability Analysis of Microgrid System Based on Real-time Grid Impedance Measurement using Quadratic Residue Binary Sequence (QRBS)
2019 IEEE 4th International Future Energy Electronics Conference (IFEEC), 2019Co-Authors: Srinivasarao Kamala, Sanjib K. Panda, Gehan AmaratungaAbstract:Thee-phase micro-grid systems with tightly regulated power converters are prone to interactions and causes small signal instability. The regulated converters behaves like constant power load (CPL), and cause instability. Adaptive controllers can be used to ensure the stable operation of system, and controllers require real-time grid Impedance Measurement. In this paper, a computationally effective Impedance Measurement technique using the Quadratic Residue Binary Sequence (QRBS) has been proposed. The QRBS signal is a class of Pseudo Random Binary Sequence (PRBS), which is used for system identification in control engineering. The proposed signal has low crest factor compared to the conventional Newman's multi-sine signal. In order to measure the grid Impedance, the QRBS sequence is added to the d and q-components of the CPL current. Once the grid Impedance is measured, stability of the system is analyzed using the Generalized Nyquist Stability Criteria (GNC). The effectiveness of proposed Impedance Measurement algorithm using the QRBS signal has been tested in MATLAB/Simulink simulation environment for a three-phase micro-grid system. Simulation results are effectively demonstrated the Impedance Measurement algorithm using QRBS sequence.
Srinivasarao Kamala - One of the best experts on this subject based on the ideXlab platform.
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real time grid Impedance Measurement of three phase micro grid system in d q frame using quadratic residue ternary sequence qrts
IEEE International Future Energy Electronics Conference, 2019Co-Authors: Srinivasarao Kamala, Sanjib K. Panda, Gehan AmaratungaAbstract:Thee-phase micro-grid systems with tightly regulated power converters are prone to interactions and causes small signal instability. The regulated converters behave like constant power loads (CPLs), and cause instability. Adaptive controllers can be used to ensure stable operation of the system, and the controllers require real-time grid Impedance Measurement. In this paper, a computationally effective Impedance Measurement technique using the Quadratic Residue Ternary Sequence (QRTS) has been proposed. The QRTS signal is a class of Pseudo Random Binary Sequence (PRBS), which is used for system identification in control engineering. The proposed signal has low crest factor compared to the conventional Newman’s multi-sine signal. The effectiveness of the proposed Impedance Measurement technique using QRTS signal has been tested in MATLAB/Simulink simulation environment for a three-phase micro-grid system. The results have been validated with the conventional Newman’s multi-sine perturbation, and results shows that the QRTS is an effective perturbation method to measure real-time grid Impedance.
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Small Signal Stability Analysis of Microgrid System Based on Real-time Grid Impedance Measurement using Quadratic Residue Binary Sequence (QRBS)
2019 IEEE 4th International Future Energy Electronics Conference (IFEEC), 2019Co-Authors: Srinivasarao Kamala, Sanjib K. Panda, Gehan AmaratungaAbstract:Thee-phase micro-grid systems with tightly regulated power converters are prone to interactions and causes small signal instability. The regulated converters behaves like constant power load (CPL), and cause instability. Adaptive controllers can be used to ensure the stable operation of system, and controllers require real-time grid Impedance Measurement. In this paper, a computationally effective Impedance Measurement technique using the Quadratic Residue Binary Sequence (QRBS) has been proposed. The QRBS signal is a class of Pseudo Random Binary Sequence (PRBS), which is used for system identification in control engineering. The proposed signal has low crest factor compared to the conventional Newman's multi-sine signal. In order to measure the grid Impedance, the QRBS sequence is added to the d and q-components of the CPL current. Once the grid Impedance is measured, stability of the system is analyzed using the Generalized Nyquist Stability Criteria (GNC). The effectiveness of proposed Impedance Measurement algorithm using the QRBS signal has been tested in MATLAB/Simulink simulation environment for a three-phase micro-grid system. Simulation results are effectively demonstrated the Impedance Measurement algorithm using QRBS sequence.
Adrian P Larsen - One of the best experts on this subject based on the ideXlab platform.
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An 8-channel skin Impedance Measurement system for acupuncture research
2009 Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2009Co-Authors: Tran Thong, Agatha P Colbert, Adrian P LarsenAbstract:An 8-channel skin Impedance Measurement system for acupuncture research has been developed. The underlying model of the skin used is a parallel R & C network. Pulses are used to measure the R and C values. The Measurement circuit is time multiplexed across the 8 channels at the rate of 2 Measurements per second, leading to a complete set of Measurements every 4 seconds. In static tests, the system has been operational for over 2 days of continuous Measurements. In preliminary human tests, Measurements over 2 hours have been collected per subject.
Sanjib K. Panda - One of the best experts on this subject based on the ideXlab platform.
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real time grid Impedance Measurement of three phase micro grid system in d q frame using quadratic residue ternary sequence qrts
IEEE International Future Energy Electronics Conference, 2019Co-Authors: Srinivasarao Kamala, Sanjib K. Panda, Gehan AmaratungaAbstract:Thee-phase micro-grid systems with tightly regulated power converters are prone to interactions and causes small signal instability. The regulated converters behave like constant power loads (CPLs), and cause instability. Adaptive controllers can be used to ensure stable operation of the system, and the controllers require real-time grid Impedance Measurement. In this paper, a computationally effective Impedance Measurement technique using the Quadratic Residue Ternary Sequence (QRTS) has been proposed. The QRTS signal is a class of Pseudo Random Binary Sequence (PRBS), which is used for system identification in control engineering. The proposed signal has low crest factor compared to the conventional Newman’s multi-sine signal. The effectiveness of the proposed Impedance Measurement technique using QRTS signal has been tested in MATLAB/Simulink simulation environment for a three-phase micro-grid system. The results have been validated with the conventional Newman’s multi-sine perturbation, and results shows that the QRTS is an effective perturbation method to measure real-time grid Impedance.
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Small Signal Stability Analysis of Microgrid System Based on Real-time Grid Impedance Measurement using Quadratic Residue Binary Sequence (QRBS)
2019 IEEE 4th International Future Energy Electronics Conference (IFEEC), 2019Co-Authors: Srinivasarao Kamala, Sanjib K. Panda, Gehan AmaratungaAbstract:Thee-phase micro-grid systems with tightly regulated power converters are prone to interactions and causes small signal instability. The regulated converters behaves like constant power load (CPL), and cause instability. Adaptive controllers can be used to ensure the stable operation of system, and controllers require real-time grid Impedance Measurement. In this paper, a computationally effective Impedance Measurement technique using the Quadratic Residue Binary Sequence (QRBS) has been proposed. The QRBS signal is a class of Pseudo Random Binary Sequence (PRBS), which is used for system identification in control engineering. The proposed signal has low crest factor compared to the conventional Newman's multi-sine signal. In order to measure the grid Impedance, the QRBS sequence is added to the d and q-components of the CPL current. Once the grid Impedance is measured, stability of the system is analyzed using the Generalized Nyquist Stability Criteria (GNC). The effectiveness of proposed Impedance Measurement algorithm using the QRBS signal has been tested in MATLAB/Simulink simulation environment for a three-phase micro-grid system. Simulation results are effectively demonstrated the Impedance Measurement algorithm using QRBS sequence.
Jin Bae Park - One of the best experts on this subject based on the ideXlab platform.
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Load Impedance Measurement on a Coaxial Cable via Time-Frequency Domain Reflectometry
2006 SICE-ICASE International Joint Conference, 2006Co-Authors: Ki-seok Kwak, Tae Sung Yoon, Jin Bae ParkAbstract:In this paper, a new signal processing based methodology which is able to measure a load Impedance with high accuracy and resolution is implemented. This methodology is characterized by a chirp signal with Gaussian envelope which enables one to achieve time localization and to assign energy in the frequency band of interest at the same time. For an evaluating the reflection coefficient and estimating the fault distance on a cable a normalized time-frequency cross-correlation function is utilized, and a cross time-frequency distribution function is used to acquire the phase difference between the input and the reflected signals. The real Impedance Measurement experiments have been carried out using a time-frequency domain reflectometry (TEDR) system on a coaxial cable with various sorts of terminal resistors. The experimental results of the TEDR based Impedance Measurement are compared with those of the commercial time domain reflectometry (TDR). The proposed TEDR based Impedance Measurement methodology shows that it is able to evaluate the location of fault on a coaxial cable and it can offers information of the fault as the load Impedance
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The Load Impedance Measurement in the Time-Frequency Domain Reflectometry System
2005 IEEE Instrumentationand Measurement Technology Conference Proceedings, 2005Co-Authors: Tokson Choe, Ki-seok Kwak, Yong-june Shin, Jin Bae Park, Tae Sung YoonAbstract:In this paper, TFDR-based Impedance Measurement methodology proposed by YongJune Shin et al. (2003) is implemented. TFDR allows one to compensate the error of Impedance Measurement caused by distortion in transmission line by measuring phase difference and local frequency offset between the input and the reflected signals. The implemented experimental system is composed of the TFDR as a main framework and terminal resistor as load Impedance. The experimental results imply that it is possible to acquire more accurate complex Impedance with comparatively lower performance instruments than those of the conventional commercial TDR
