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Power System Analysis
01 Jan 1994-
TL;DR: In this paper, the authors present a model for estimating the Impedance of Transmission Lines and the Capacitance of Transformer Lines in the presence of Symmetrical Faults.
Abstract: 1 Basic Concepts 2 Transformers 3 The Synchronous Machine 4 Series Impedance of Transmission Lines 5 Capacitance of Transmission Lines 6 Current and Voltage Relations on a Transmission Line 7 The Admittance Model and Network Calculations 8 The Impedance Model and Network Calculations 9 Power Flow Solutions 10 Symmetrical Faults 11 Symmetrical Components and Sequence Networks 12 Unsymmetrical Faults 13 Economic Operation of Power Systems 14 Zbus Methods in Contingency Analysis 15 State Estimation of Power Systems 16 Power System Stability
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TL;DR: In this article, a method is proposed to let variable-speed wind turbines emulate inertia and support primary frequency control, where the required power is obtained from the kinetic energy stored in the rotating mass of the turbine blades.
Abstract: The increasing penetration of variable-speed wind turbines in the electricity grid will result in a reduction of the number of connected conventional power plants. This will require changes in the way the grid frequency is controlled. In this letter, a method is proposed to let variable-speed wind turbines emulate inertia and support primary frequency control. The required power is obtained from the kinetic energy stored in the rotating mass of the turbine blades.
1,106 citations
Cites background from "Power System Analysis"
...Typical inertia constants for the generators of the large power plants are in the range of 2–9 s [3]....
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TL;DR: In this article, the authors present a comprehensive summary of the causes and effects of voltage unbalance and discuss related standards, definitions, and mitigation techniques, as well as the resulting adverse effects on the system and on equipment such as induction motors and power electronic converters and drives.
Abstract: This paper endeavors to present a comprehensive summary of the causes and effects of voltage unbalance and to discuss related standards, definitions, and mitigation techniques. Several causes of voltage unbalance on the power system and in industrial facilities are presented as well as the resulting adverse effects on the system and on equipment such as induction motors and power electronic converters and drives. Standards addressing voltage unbalance are discussed and clarified, and several mitigation techniques are suggested to correct voltage unbalance problems. This paper makes apparent the importance of identifying potential unbalance problems for the benefit of both the utility and customer.
656 citations
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TL;DR: In this article, a condition for the stability of the synchronous state enables identification of network parameters that enhance spontaneous synchronization, highlighting the possibility of smart grids that operate optimally in real-world systems.
Abstract: Power-grid networks must be synchronized in order to function. A condition for the stability of the synchronous state enables identification of network parameters that enhance spontaneous synchronization—heralding the possibility of smart grids that operate optimally in real-world systems.
653 citations
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TL;DR: A survey of the most relevant scientific studies investigating the properties of different Power Grids infrastructures using Complex Network Analysis techniques and methodologies and traces the evolution in such field of the approach of study during the years to see the improvement achieved in the analysis.
Abstract: The statistical tools of Complex Network Analysis are of useful to understand salient properties of complex systems, may these be natural or pertaining human engineered infrastructures. One of these that is receiving growing attention for its societal relevance is that of electricity distribution. In this paper, we present a survey of the most relevant scientific studies investigating the properties of different Power Grids infrastructures using Complex Network Analysis techniques and methodologies. We categorize and explore the most relevant literature works considering general topological properties, physical properties, and differences between the various graph-related indicators and reliability aspects. We also trace the evolution in such field of the approach of study during the years to see the improvement achieved in the analysis.
586 citations
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TL;DR: In this article, a combined analysis was developed to investigate the performance of electricity and heat networks as an integrated whole, based on a model of electrical power flow and hydraulic and thermal circuits together with their coupling components (CHP units, heat pumps, electric boilers and circulation pumps).
576 citations
Cites background or methods from "Power System Analysis"
...This additional equation was formed using the equal-incremental-fuel-cost criterion [27,28,46]....
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...The equal-incremental-fuel-cost criterion states that for optimum economy the incremental fuel cost should be identical for all contributing turbine-generator sets [27,28]....
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...The AC electrical power flow model for electrical networks is well established [27,28]....
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