The Experts below are selected from a list of 246 Experts worldwide ranked by ideXlab platform
D. Sun - One of the best experts on this subject based on the ideXlab platform.
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large Scale Voltage stability constrained optimal var planning and Voltage stability applications using existing opf optimal var planning tools
IEEE Transactions on Power Systems, 1999Co-Authors: Ebrahim Vaahedi, J. Tamby, Y. Mansour, D. SunAbstract:Traditionally in optimal VAr planning, the feasible operation has been translated as observing Voltage profile criteria ensuring that the system Voltage profile is acceptable for system normal and post contingency conditions. This feasibility definition is not sufficient when considering the VAr planning practice of the utilities concerned with Voltage stability problems. Presently, these utilities use two reinforcement criteria for VAr additions. While for VAr design in the regions the Voltage profile criteria is considered, for bulk transmission system VAr resources are designed to guard against Voltage instability. This paper reports on the findings of a recently completed EPRI project evaluating the existing optimal VAr planning/OPF tools for Voltage stability constrained VAr planning and Voltage stability applications. Two of the selected tools were adapted to address these applications on four large Scale utility systems (up to 6000 buses). The results were also verified using EPRI's Voltage stability program (VSTAB). The results obtained indicate that OPF/VAr planning tools can be used to address Voltage stability constrained VAr planning and Voltage stability applications in an accurate way. Additional advantages offered by these tools are easier procedures, less computation and avoidance of engineering judgment in identifying the amount of VAr requirement at the candidate sites.
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Large Scale Voltage stability constrained optimal VAr planning and Voltage stability applications using existing OPF/optimal VAr planning tools
IEEE Transactions on Power Systems, 1999Co-Authors: Ebrahim Vaahedi, J. Tamby, Y. Mansour, D. SunAbstract:Traditionally in optimal VAr planning, the feasible operation has been translated as observing Voltage profile criteria ensuring that the system Voltage profile is acceptable for system normal and post contingency conditions. This feasibility definition is not sufficient when considering the VAr planning practice of the utilities concerned with Voltage stability problems. Presently, these utilities use two reinforcement criteria for VAr additions. While for VAr design in the regions the Voltage profile criteria is considered, for bulk transmission system VAr resources are designed to guard against Voltage instability. This paper reports on the findings of a recently completed EPRI project evaluating the existing optimal VAr planning/OPF tools for Voltage stability constrained VAr planning and Voltage stability applications. Two of the selected tools were adapted to address these applications on four large Scale utility systems (up to 6000 buses). The results were also verified using EPRI's Voltage stability program (VSTAB). The results obtained indicate that OPF/VAr planning tools can be used to address Voltage stability constrained VAr planning and Voltage stability applications in an accurate way. Additional advantages offered by these tools are easier procedures, less computation and avoidance of engineering judgment in identifying the amount of VAr requirement at the candidate sites.
Ebrahim Vaahedi - One of the best experts on this subject based on the ideXlab platform.
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large Scale Voltage stability constrained optimal var planning and Voltage stability applications using existing opf optimal var planning tools
IEEE Transactions on Power Systems, 1999Co-Authors: Ebrahim Vaahedi, J. Tamby, Y. Mansour, D. SunAbstract:Traditionally in optimal VAr planning, the feasible operation has been translated as observing Voltage profile criteria ensuring that the system Voltage profile is acceptable for system normal and post contingency conditions. This feasibility definition is not sufficient when considering the VAr planning practice of the utilities concerned with Voltage stability problems. Presently, these utilities use two reinforcement criteria for VAr additions. While for VAr design in the regions the Voltage profile criteria is considered, for bulk transmission system VAr resources are designed to guard against Voltage instability. This paper reports on the findings of a recently completed EPRI project evaluating the existing optimal VAr planning/OPF tools for Voltage stability constrained VAr planning and Voltage stability applications. Two of the selected tools were adapted to address these applications on four large Scale utility systems (up to 6000 buses). The results were also verified using EPRI's Voltage stability program (VSTAB). The results obtained indicate that OPF/VAr planning tools can be used to address Voltage stability constrained VAr planning and Voltage stability applications in an accurate way. Additional advantages offered by these tools are easier procedures, less computation and avoidance of engineering judgment in identifying the amount of VAr requirement at the candidate sites.
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Large Scale Voltage stability constrained optimal VAr planning and Voltage stability applications using existing OPF/optimal VAr planning tools
IEEE Transactions on Power Systems, 1999Co-Authors: Ebrahim Vaahedi, J. Tamby, Y. Mansour, D. SunAbstract:Traditionally in optimal VAr planning, the feasible operation has been translated as observing Voltage profile criteria ensuring that the system Voltage profile is acceptable for system normal and post contingency conditions. This feasibility definition is not sufficient when considering the VAr planning practice of the utilities concerned with Voltage stability problems. Presently, these utilities use two reinforcement criteria for VAr additions. While for VAr design in the regions the Voltage profile criteria is considered, for bulk transmission system VAr resources are designed to guard against Voltage instability. This paper reports on the findings of a recently completed EPRI project evaluating the existing optimal VAr planning/OPF tools for Voltage stability constrained VAr planning and Voltage stability applications. Two of the selected tools were adapted to address these applications on four large Scale utility systems (up to 6000 buses). The results were also verified using EPRI's Voltage stability program (VSTAB). The results obtained indicate that OPF/VAr planning tools can be used to address Voltage stability constrained VAr planning and Voltage stability applications in an accurate way. Additional advantages offered by these tools are easier procedures, less computation and avoidance of engineering judgment in identifying the amount of VAr requirement at the candidate sites.
J. Tamby - One of the best experts on this subject based on the ideXlab platform.
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large Scale Voltage stability constrained optimal var planning and Voltage stability applications using existing opf optimal var planning tools
IEEE Transactions on Power Systems, 1999Co-Authors: Ebrahim Vaahedi, J. Tamby, Y. Mansour, D. SunAbstract:Traditionally in optimal VAr planning, the feasible operation has been translated as observing Voltage profile criteria ensuring that the system Voltage profile is acceptable for system normal and post contingency conditions. This feasibility definition is not sufficient when considering the VAr planning practice of the utilities concerned with Voltage stability problems. Presently, these utilities use two reinforcement criteria for VAr additions. While for VAr design in the regions the Voltage profile criteria is considered, for bulk transmission system VAr resources are designed to guard against Voltage instability. This paper reports on the findings of a recently completed EPRI project evaluating the existing optimal VAr planning/OPF tools for Voltage stability constrained VAr planning and Voltage stability applications. Two of the selected tools were adapted to address these applications on four large Scale utility systems (up to 6000 buses). The results were also verified using EPRI's Voltage stability program (VSTAB). The results obtained indicate that OPF/VAr planning tools can be used to address Voltage stability constrained VAr planning and Voltage stability applications in an accurate way. Additional advantages offered by these tools are easier procedures, less computation and avoidance of engineering judgment in identifying the amount of VAr requirement at the candidate sites.
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Large Scale Voltage stability constrained optimal VAr planning and Voltage stability applications using existing OPF/optimal VAr planning tools
IEEE Transactions on Power Systems, 1999Co-Authors: Ebrahim Vaahedi, J. Tamby, Y. Mansour, D. SunAbstract:Traditionally in optimal VAr planning, the feasible operation has been translated as observing Voltage profile criteria ensuring that the system Voltage profile is acceptable for system normal and post contingency conditions. This feasibility definition is not sufficient when considering the VAr planning practice of the utilities concerned with Voltage stability problems. Presently, these utilities use two reinforcement criteria for VAr additions. While for VAr design in the regions the Voltage profile criteria is considered, for bulk transmission system VAr resources are designed to guard against Voltage instability. This paper reports on the findings of a recently completed EPRI project evaluating the existing optimal VAr planning/OPF tools for Voltage stability constrained VAr planning and Voltage stability applications. Two of the selected tools were adapted to address these applications on four large Scale utility systems (up to 6000 buses). The results were also verified using EPRI's Voltage stability program (VSTAB). The results obtained indicate that OPF/VAr planning tools can be used to address Voltage stability constrained VAr planning and Voltage stability applications in an accurate way. Additional advantages offered by these tools are easier procedures, less computation and avoidance of engineering judgment in identifying the amount of VAr requirement at the candidate sites.
Y. Mansour - One of the best experts on this subject based on the ideXlab platform.
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large Scale Voltage stability constrained optimal var planning and Voltage stability applications using existing opf optimal var planning tools
IEEE Transactions on Power Systems, 1999Co-Authors: Ebrahim Vaahedi, J. Tamby, Y. Mansour, D. SunAbstract:Traditionally in optimal VAr planning, the feasible operation has been translated as observing Voltage profile criteria ensuring that the system Voltage profile is acceptable for system normal and post contingency conditions. This feasibility definition is not sufficient when considering the VAr planning practice of the utilities concerned with Voltage stability problems. Presently, these utilities use two reinforcement criteria for VAr additions. While for VAr design in the regions the Voltage profile criteria is considered, for bulk transmission system VAr resources are designed to guard against Voltage instability. This paper reports on the findings of a recently completed EPRI project evaluating the existing optimal VAr planning/OPF tools for Voltage stability constrained VAr planning and Voltage stability applications. Two of the selected tools were adapted to address these applications on four large Scale utility systems (up to 6000 buses). The results were also verified using EPRI's Voltage stability program (VSTAB). The results obtained indicate that OPF/VAr planning tools can be used to address Voltage stability constrained VAr planning and Voltage stability applications in an accurate way. Additional advantages offered by these tools are easier procedures, less computation and avoidance of engineering judgment in identifying the amount of VAr requirement at the candidate sites.
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Large Scale Voltage stability constrained optimal VAr planning and Voltage stability applications using existing OPF/optimal VAr planning tools
IEEE Transactions on Power Systems, 1999Co-Authors: Ebrahim Vaahedi, J. Tamby, Y. Mansour, D. SunAbstract:Traditionally in optimal VAr planning, the feasible operation has been translated as observing Voltage profile criteria ensuring that the system Voltage profile is acceptable for system normal and post contingency conditions. This feasibility definition is not sufficient when considering the VAr planning practice of the utilities concerned with Voltage stability problems. Presently, these utilities use two reinforcement criteria for VAr additions. While for VAr design in the regions the Voltage profile criteria is considered, for bulk transmission system VAr resources are designed to guard against Voltage instability. This paper reports on the findings of a recently completed EPRI project evaluating the existing optimal VAr planning/OPF tools for Voltage stability constrained VAr planning and Voltage stability applications. Two of the selected tools were adapted to address these applications on four large Scale utility systems (up to 6000 buses). The results were also verified using EPRI's Voltage stability program (VSTAB). The results obtained indicate that OPF/VAr planning tools can be used to address Voltage stability constrained VAr planning and Voltage stability applications in an accurate way. Additional advantages offered by these tools are easier procedures, less computation and avoidance of engineering judgment in identifying the amount of VAr requirement at the candidate sites.
D J Allstot - One of the best experts on this subject based on the ideXlab platform.
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a mixed signal calibration technique for low Voltage cmos 1 5 bit stage pipeline data converters
International Symposium on Circuits and Systems, 2003Co-Authors: Jianjun Guo, Waisiu Law, C T Peach, W J Helms, D J AllstotAbstract:A mixed analog/digital calibration technique for low-Voltage CMOS pipeline A/D converters is presented. It provides high linearity over a large full-Scale Voltage range while operating at low power supply Voltages. Extensive HSPICE simulation results are used to characterize the nonlinearity of a typical CMOS folded-cascode operational amplifier, and the new correction algorithm is validated using MATLAB behavioral simulations. A 10-bit converter requires only two additional calibration stages and achieves a full-Scale range of 1.5V/sub pp/ using a single 1.8V power supply. The simulated DNL and INL values are 0.67LSB and 0.58LSB, respectively, and the effective number of bits is 9.6.
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ISCAS (1) - A mixed-signal calibration technique for low-Voltage CMOS 1.5-bit/stage pipeline data converters
Proceedings of the 2003 International Symposium on Circuits and Systems 2003. ISCAS '03., 1Co-Authors: Jianjun Guo, Waisiu Law, C T Peach, W J Helms, D J AllstotAbstract:A mixed analog/digital calibration technique for low-Voltage CMOS pipeline A/D converters is presented. It provides high linearity over a large full-Scale Voltage range while operating at low power supply Voltages. Extensive HSPICE simulation results are used to characterize the nonlinearity of a typical CMOS folded-cascode operational amplifier, and the new correction algorithm is validated using MATLAB behavioral simulations. A 10-bit converter requires only two additional calibration stages and achieves a full-Scale range of 1.5V/sub pp/ using a single 1.8V power supply. The simulated DNL and INL values are 0.67LSB and 0.58LSB, respectively, and the effective number of bits is 9.6.
