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In this paper a Coordinated Secondary Voltage Control (CSVC) applied to transmission and sub-transmission level, in the context of deregulated industry, is proposed. Using the principle of the CSVC, the system was divided in volta...
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In this paper a Coordinated Secondary Voltage Control (CSVC) applied to transmission and sub-transmission level, in the context of deregulated industry, is proposed. Using the principle of the CSVC, the system was divided in voltage control areas and some pilot node for each one were chosen to have voltages monitoring in order to describe the voltage behaviour inside the area. The automatic voltage regulators of LTC and switching of compensation devices (capacitors) provide the primary voltage control in substation level (local control). The CSVC is carried out in two pilot node using information of the system (transmission and sub-transmission margins) and local area (distribution system). Preliminar results the benefits of application of CSVC are illustrated through a real system of the electric power utility in South of Brazil. An area with two pilot node was modeling to analyze the performance of proposed CSVC. Steady-state approach was first used to determine the structure of the adequate control sequence in terms of a choice of ULTC are candidate to control and amount of control are necessary to minimize system losses and reactive power interchanges and provide voltage stability and security.
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This paper presents preliminary results of the investigations related to the prospective application of a hierarchical coordinated voltage control to parts of the Brazilian EHV network. The paper focuses on the Secondary Voltage C...
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This paper presents preliminary results of the investigations related to the prospective application of a hierarchical coordinated voltage control to parts of the Brazilian EHV network. The paper focuses on the Secondary Voltage Control (SVC) hierarchical level, with emphasis on voltage control by power plants and synchronous condensers. The study system analyzed is the Rio de Janeiro (Rio) Area, which is an energy importing area. Results refer to a heavy load condition, typical of a hot summer day.
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摘要 :
In this paper, a basic overview of voltage control levels is provided with emphasis on Secondary Voltage Control (SVC). The Brazilian simulations of implementing SVC are discussed to highlight the benefits of SVC. Also, some imple...
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In this paper, a basic overview of voltage control levels is provided with emphasis on Secondary Voltage Control (SVC). The Brazilian simulations of implementing SVC are discussed to highlight the benefits of SVC. Also, some implementation issues are discussed.
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摘要 :
In this paper, a basic overview of voltage control levels is provided with emphasis on Secondary Voltage Control (SVC). The Brazilian simulations of implementing SVC are discussed to highlight the benefits of SVC. Also, some imple...
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In this paper, a basic overview of voltage control levels is provided with emphasis on Secondary Voltage Control (SVC). The Brazilian simulations of implementing SVC are discussed to highlight the benefits of SVC. Also, some implementation issues are discussed.
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Transformer voltage regulator can be used to regulate the voltage in the electrical network. The authors developed a voltage regulator prototype. Transformer regulator introduces a boost or buck voltage in the line and allows one ...
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Transformer voltage regulator can be used to regulate the voltage in the electrical network. The authors developed a voltage regulator prototype. Transformer regulator introduces a boost or buck voltage in the line and allows one to adjust the network voltage in amplitude (longitudinal voltage control) and phase (transversal voltage control). Mathematical models of the network with transformer voltage regulator developed in SamSim. The simulation results allowed determining the parameters of the longitudinal and transverse perturbations that can be compensated by voltage regulator. The influence of the transformer regulator model parameters on its dynamic characteristics has been investigated.
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This paper describes how voltage control areas can be identified by analyzing two sensitivity matrices. The voltage control sensitivity matrix [VCS] consists of diagonal elements that relate the magnitude of each control variable ...
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This paper describes how voltage control areas can be identified by analyzing two sensitivity matrices. The voltage control sensitivity matrix [VCS] consists of diagonal elements that relate the magnitude of each control variable to the respective controlled voltage. Analysis of the sign of these elements provides information about whether a particular control action is appropriate or not, i.e., whether it will have the expected effect or an opposite one. The off-diagonal elements represent the interdependence among the voltage control devices. The V-Q sensitivity matrix [J_(SQV)] is obtained by reducing the Jacobian matrix used to solve the load flow equations by the Newton method. Comparison of the voltage control areas identified by eigenvalue and eigenvector analysis using each of the sensitivity matrices yields consistent results. A comparison is also made of these areas with those obtained directly from the matrices by applying the concept of voltage coherency.
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摘要 :
This paper describes how voltage control areas can be identified by analyzing two sensitivity matrices. The voltage control sensitivity matrix [VCS] consists of diagonal elements that relate the magnitude of each control variable ...
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This paper describes how voltage control areas can be identified by analyzing two sensitivity matrices. The voltage control sensitivity matrix [VCS] consists of diagonal elements that relate the magnitude of each control variable to the respective controlled voltage. Analysis of the sign of these elements provides information about whether a particular control action is appropriate or not, i.e., whether it will have the expected effect or an opposite one. The off-diagonal elements represent the interdependence among the voltage control devices. The V-Q sensitivity matrix [JSQV] is obtained by reducing the Jacobian matrix used to solve the load flow equations by the Newton method. Comparison of the voltage control areas identified by eigenvalue and eigenvector analysis using each of the sensitivity matrices yields consistent results. A comparison is also made of these areas with those obtained directly from the matrices by applying the concept of voltage coherency.
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摘要 :
This paper describes how voltage control areas can be identified by analyzing two sensitivity matrices. The voltage control sensitivity matrix [VCS] consists of diagonal elements that relate the magnitude of each control variable ...
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This paper describes how voltage control areas can be identified by analyzing two sensitivity matrices. The voltage control sensitivity matrix [VCS] consists of diagonal elements that relate the magnitude of each control variable to the respective controlled voltage. Analysis of the sign of these elements provides information about whether a particular control action is appropriate or not, i.e., whether it will have the expected effect or an opposite one. The off-diagonal elements represent the interdependence among the voltage control devices. The V-Q sensitivity matrix [JSQV] is obtained by reducing the Jacobian matrix used to solve the load flow equations by the Newton method. Comparison of the voltage control areas identified by eigenvalue and eigenvector analysis using each of the sensitivity matrices yields consistent results. A comparison is also made of these areas with those obtained directly from the matrices by applying the concept of voltage coherency.
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This paper presents a new method for determining coherent bus group called voltage control area (VCA) based on reactive power control capabilities of that area. VCA can be used in voltage stability assessment and optimal reactive ...
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This paper presents a new method for determining coherent bus group called voltage control area (VCA) based on reactive power control capabilities of that area. VCA can be used in voltage stability assessment and optimal reactive power allocation. The proposed method is based on the sensitivity of reactive power of generator to reactive power of load which is the direct relation between the production and consumption of reactive power in the system. The results are shown for the New England 39 bus test system and 68 bus test system.
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In this paper, the problem of analytically coordinating dissimilar voltage control actions to prevent voltage collapse in a large power system is addressed. A framework for hybrid control based on coordination of controls with dif...
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In this paper, the problem of analytically coordinating dissimilar voltage control actions to prevent voltage collapse in a large power system is addressed. A framework for hybrid control based on coordination of controls with different responsetime and dynamic characteristics is presented. The proposed method is based on a security constrained steady-state approach. The minimum distance from the operating point to the bifurcation boundary is used to evaluate system security. The optimalcorrective control direction towards adequate security is then obtained by calculating the sensitivity of the minimum distance with respect to controls. The actual dispatch of controls along the optimal direction, which takes into account impacts ofeconomic cost and control availability, is determined as the solution of a multiple stage optimization problem using differential dynamic programming. The algorithm is demonstrated for a system with dynamic load models representing the main grid of theNew South Wales, Australia.
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