The Experts below are selected from a list of 1026 Experts worldwide ranked by ideXlab platform
Shiqiong Tong - One of the best experts on this subject based on the ideXlab platform.
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Slack Bus Modeling and Cost Analysis of Distributed Generator Installations
Journal of Energy Engineering, 2007Co-Authors: Shiqiong Tong, Karen MiuAbstract:The installation and operation of distributed generators (DGs) has great potential for local utilities to improve distribution system reliability and lower their operating and expansion planning costs. To evaluate this potential, distribution system analyses must reflect its new operating environment with significant DG. Resulting tools can be utilized by both utilities and DG owners to improve their decision making algorithms. As such, this work investigates two different Slack Bus models for unbalanced distribution power flow and their impacts on subsequent cost analysis. The models include the traditional single Slack Bus model which assigns the substation as the Slack Bus and a distributed Slack Bus model which assigns Slack to the substation and DGs according to network-based participation factors. Detailed expressions for cost analysis which directly depend on the distributed Slack Bus model are presented and discussed. Simulations illustrate that the different Slack Bus models have significant impa...
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A distributed Slack Bus model and its impact on distribution system application techniques
2005 IEEE International Symposium on Circuits and Systems, 2005Co-Authors: Shiqiong Tong, Michael Kleinberg, K. MiuAbstract:Distribution system operating environments are changing rapidly. For example, with the steady and significant increase in dispersed generation expected, planning and operating application techniques must also change. The paper re-evaluates the single Slack Bus assumption typically employed in steady-state distribution power flow solvers. Specifically, a distributed Slack Bus model, based on the concept of generator domains, is discussed and integrated into a power flow solver. Improved representation and allocation of distribution system losses to multiple generators is expected to impact other application techniques, such as capacitor placement, service restoration, etc. In addition, economic impacts of dispersed generation are significant and simulation results are presented to highlight this impact.
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a network based distributed Slack Bus model for dgs in unbalanced power flow studies
IEEE Transactions on Power Systems, 2005Co-Authors: Shiqiong Tong, Karen MiuAbstract:This paper revisits the concept of a single Slack Bus in power flow solvers for distribution systems to accommodate the anticipated growth of distributed generators (DGs) in unbalanced distribution systems. It introduces a distributed Slack Bus model through scalar participation factors by applying the concept of generator domains. The participation factors are incorporated into the three-phase power flow equations, and a Newton-Raphson solver is discussed and implemented. Simulation results on systems with a different number of DGs and different levels of DG penetration are obtained and studied.
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A Distributed Slack Bus Model and Its Impact on
2005Co-Authors: Shiqiong Tong, Michael Kleinberg, Karen MiuAbstract:Distribution system operating environments are changing rapidly. For example, with the steady and significant increase in dispersed generation expected, planning and operating application techniques must also change. This paper re-evaluates the single Slack Bus assumption typically employed in steady-state distribution power flow solvers. Specifically, a distributed Slack Bus model based on the concept of generator domains will be discussed and integrated into a power flow solver. Improved representation and allocation of distribution system losses to multiple generators is expected to impact other application techniques such as capacitor placement, service restoration, etc. In addition economic impacts of dispersed generation are significant and simulation results will be presented to highlight this impact. I. INTRODUCTION
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A participation factor model for Slack Buses in distribution systems with DGs
2003 IEEE PES Transmission and Distribution Conference and Exposition (IEEE Cat. No.03CH37495), 2003Co-Authors: Shiqiong Tong, K.n. MiuAbstract:This paper revisits the concept of a single Slack Bus in power flow solvers for distribution systems to accommodate the anticipated growth of distributed generators (DG) in unbalanced distribution systems. It introduces a model to distribute the Slack Bus through scalar participation factors applying the concept of generator domains. The inclusion of the participation factors into three-phase power flow solvers is discussed.
Karen Miu - One of the best experts on this subject based on the ideXlab platform.
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Slack Bus Modeling and Cost Analysis of Distributed Generator Installations
Journal of Energy Engineering, 2007Co-Authors: Shiqiong Tong, Karen MiuAbstract:The installation and operation of distributed generators (DGs) has great potential for local utilities to improve distribution system reliability and lower their operating and expansion planning costs. To evaluate this potential, distribution system analyses must reflect its new operating environment with significant DG. Resulting tools can be utilized by both utilities and DG owners to improve their decision making algorithms. As such, this work investigates two different Slack Bus models for unbalanced distribution power flow and their impacts on subsequent cost analysis. The models include the traditional single Slack Bus model which assigns the substation as the Slack Bus and a distributed Slack Bus model which assigns Slack to the substation and DGs according to network-based participation factors. Detailed expressions for cost analysis which directly depend on the distributed Slack Bus model are presented and discussed. Simulations illustrate that the different Slack Bus models have significant impa...
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a network based distributed Slack Bus model for dgs in unbalanced power flow studies
IEEE Transactions on Power Systems, 2005Co-Authors: Shiqiong Tong, Karen MiuAbstract:This paper revisits the concept of a single Slack Bus in power flow solvers for distribution systems to accommodate the anticipated growth of distributed generators (DGs) in unbalanced distribution systems. It introduces a distributed Slack Bus model through scalar participation factors by applying the concept of generator domains. The participation factors are incorporated into the three-phase power flow equations, and a Newton-Raphson solver is discussed and implemented. Simulation results on systems with a different number of DGs and different levels of DG penetration are obtained and studied.
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A Distributed Slack Bus Model and Its Impact on
2005Co-Authors: Shiqiong Tong, Michael Kleinberg, Karen MiuAbstract:Distribution system operating environments are changing rapidly. For example, with the steady and significant increase in dispersed generation expected, planning and operating application techniques must also change. This paper re-evaluates the single Slack Bus assumption typically employed in steady-state distribution power flow solvers. Specifically, a distributed Slack Bus model based on the concept of generator domains will be discussed and integrated into a power flow solver. Improved representation and allocation of distribution system losses to multiple generators is expected to impact other application techniques such as capacitor placement, service restoration, etc. In addition economic impacts of dispersed generation are significant and simulation results will be presented to highlight this impact. I. INTRODUCTION
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Participation Factor Studies for Distributed Slack Bus Models in Three-Phase Distribution Power Flow Analysis
2005 2006 PES TD, 1Co-Authors: Shiqiong Tong, Karen MiuAbstract:With the increase of distributed generators (DGs) installed within power networks, new analysis tools for planning and operating are required to develop for distribution systems with multiple sources. Power flow with a distributed Slack Bus model is considered more realistic than a single Slack Bus model, since there is no Slack Bus in real power systems. Participation factors can be applied to assign Slack for distributed Slack Bus models. Previous works about participation factors for distributed Slack Bus models focused on transmission systems. Due to special characteristics of distribution systems, such as high R/X ratios and network imbalance, these previous works cannot be applied directly. This paper presents a three-phase distribution power flow with a distributed Slack Bus model and studies of two different methods to calculate participation factors. The methods are based on network sensitivity factors and on the concepts of generator domains
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ISCAS (5) - A distributed Slack Bus model and its impact on distribution system application techniques
2005 IEEE International Symposium on Circuits and Systems, 1Co-Authors: Shiqiong Tong, Michael Kleinberg, Karen MiuAbstract:Distribution system operating environments are changing rapidly. For example, with the steady and significant increase in dispersed generation expected, planning and operating application techniques must also change. The paper re-evaluates the single Slack Bus assumption typically employed in steady-state distribution power flow solvers. Specifically, a distributed Slack Bus model, based on the concept of generator domains, is discussed and integrated into a power flow solver. Improved representation and allocation of distribution system losses to multiple generators is expected to impact other application techniques, such as capacitor placement, service restoration, etc. In addition, economic impacts of dispersed generation are significant and simulation results are presented to highlight this impact.
K. Miu - One of the best experts on this subject based on the ideXlab platform.
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A distributed Slack Bus model and its impact on distribution system application techniques
2005 IEEE International Symposium on Circuits and Systems, 2005Co-Authors: Shiqiong Tong, Michael Kleinberg, K. MiuAbstract:Distribution system operating environments are changing rapidly. For example, with the steady and significant increase in dispersed generation expected, planning and operating application techniques must also change. The paper re-evaluates the single Slack Bus assumption typically employed in steady-state distribution power flow solvers. Specifically, a distributed Slack Bus model, based on the concept of generator domains, is discussed and integrated into a power flow solver. Improved representation and allocation of distribution system losses to multiple generators is expected to impact other application techniques, such as capacitor placement, service restoration, etc. In addition, economic impacts of dispersed generation are significant and simulation results are presented to highlight this impact.
Michael Kleinberg - One of the best experts on this subject based on the ideXlab platform.
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A distributed Slack Bus model and its impact on distribution system application techniques
2005 IEEE International Symposium on Circuits and Systems, 2005Co-Authors: Shiqiong Tong, Michael Kleinberg, K. MiuAbstract:Distribution system operating environments are changing rapidly. For example, with the steady and significant increase in dispersed generation expected, planning and operating application techniques must also change. The paper re-evaluates the single Slack Bus assumption typically employed in steady-state distribution power flow solvers. Specifically, a distributed Slack Bus model, based on the concept of generator domains, is discussed and integrated into a power flow solver. Improved representation and allocation of distribution system losses to multiple generators is expected to impact other application techniques, such as capacitor placement, service restoration, etc. In addition, economic impacts of dispersed generation are significant and simulation results are presented to highlight this impact.
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A Distributed Slack Bus Model and Its Impact on
2005Co-Authors: Shiqiong Tong, Michael Kleinberg, Karen MiuAbstract:Distribution system operating environments are changing rapidly. For example, with the steady and significant increase in dispersed generation expected, planning and operating application techniques must also change. This paper re-evaluates the single Slack Bus assumption typically employed in steady-state distribution power flow solvers. Specifically, a distributed Slack Bus model based on the concept of generator domains will be discussed and integrated into a power flow solver. Improved representation and allocation of distribution system losses to multiple generators is expected to impact other application techniques such as capacitor placement, service restoration, etc. In addition economic impacts of dispersed generation are significant and simulation results will be presented to highlight this impact. I. INTRODUCTION
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ISCAS (5) - A distributed Slack Bus model and its impact on distribution system application techniques
2005 IEEE International Symposium on Circuits and Systems, 1Co-Authors: Shiqiong Tong, Michael Kleinberg, Karen MiuAbstract:Distribution system operating environments are changing rapidly. For example, with the steady and significant increase in dispersed generation expected, planning and operating application techniques must also change. The paper re-evaluates the single Slack Bus assumption typically employed in steady-state distribution power flow solvers. Specifically, a distributed Slack Bus model, based on the concept of generator domains, is discussed and integrated into a power flow solver. Improved representation and allocation of distribution system losses to multiple generators is expected to impact other application techniques, such as capacitor placement, service restoration, etc. In addition, economic impacts of dispersed generation are significant and simulation results are presented to highlight this impact.
Alejandro D. Domínguez-garcía - One of the best experts on this subject based on the ideXlab platform.
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Reexamining the Distributed Slack Bus
IEEE Transactions on Power Systems, 2020Co-Authors: Sairaj V. Dhople, Yu Christine Chen, Abdullah Al-digs, Alejandro D. Domínguez-garcíaAbstract:Power flow formulated with a distributed Slack Bus involves modeling the active-power output of each generator with three elements: a nominal injection modulated by a fraction of the net-load imbalance allocated via a participation factor. This setup acknowledges generator dynamics and system operations, but it has long been plagued by ambiguous and inconsistent interpretations of its constituent elemental quantities. In this paper, we establish that, with the: i) nominal active-power injections set to be the economic dispatch setpoints, ii) participation factors fixed to be the ones used in automatic generation control, and iii) net-load imbalance considered to be the total load and loss unaccounted in economic dispatch, the power flow solution best matches results from a simulation unto steady state of the system differential algebraic equation (DAE) model. Numerical case studies tailored to the New England test system validate the analysis by demonstrating that solutions obtained from a distributed Slack formulation offer lower errors (with respect to DAE-model simulations) compared to the exhaustive set of all single Slack Bus choices.
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Generalized Injection Shift Factors
IEEE Transactions on Smart Grid, 2017Co-Authors: Yu Christine Chen, Sairaj V. Dhople, Alejandro D. Domínguez-garcía, Peter W. SauerAbstract:Generalized injection shift factors (ISFs) are the sensitivities of active-power line flows to active-power Bus injections. They are computed without designating an artifactual Slack Bus in the power network; therefore, conceptually, they reflect sensitivities of power flows more accurately than conventional ISFs, the values of which depend on the choice of the Slack Bus. This paper derives analytical closed-form expressions for generalized ISFs from a perturbative analysis of the ac circuit equations. In addition, they are computed from a system of linear equations that arise from high-frequency synchronized measurements collected from phasor measurement units. As an application, generalized ISFs are used to predict active-power line flows during the transient period following a contingency by leveraging inertial and governor power flows over appropriate time horizons.
