The load at a specific network bus consists of a great number of different electrical customer loads. The equivalent load model describes the behavior of the load as viewed from the bus, resulting from the combined re...
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The load at a specific network bus consists of a great number of different electrical customer loads. The equivalent load model describes the behavior of the load as viewed from the bus, resulting from the combined reaction of all customer loads of the interconnection network on changes in bus voltage and network frequency. Therefore, the combined load characteristic is only approximately equal to the sum of all the single customer load characteristics. The specific feature of the load modelling approach presented here is the property that both customers and the network are taken into consideration.
A method is introduced which assures quite feasible computation of control actions to be taken to remedy voltage problems resulting in a section of a system because of a disturbance. The process is devised so as to co...
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A method is introduced which assures quite feasible computation of control actions to be taken to remedy voltage problems resulting in a section of a system because of a disturbance. The process is devised so as to conform to the natural structural features of the problem. A monitoring process is proposed. If a viability crisis is detected, first a cluster of interacting control tools are selected to match the cluster of violations. Then an effective viabilizing algorithm is carried out to restore viable voltage values in a manner least disruptive to the system. The algorithm only covers the affected cluster. Consequently it is of small dimension and converges fast. Use of this approach should substantially improve both cut and try approach by the operator on line, and straightforward computationally demanding computer implementations such as optimal load flow.
The generator maintenance scheduling problem is formulated as a mixed integer model. Some model approaches with different objective functions and various constraints are discussed. The results from sample problems and...
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The generator maintenance scheduling problem is formulated as a mixed integer model. Some model approaches with different objective functions and various constraints are discussed. The results from sample problems and a real-life thermal generation system are used to point out the advantages of the proposed objective function. Compared to a max-min criterion the suggested model aims at maximizing the sum of weighted reserve capacities over all periods. This yields a maintenance schedule better balanced with regard to the required reliability levels during the year and ensures a practicable schedule.
A generation and transmission system may tend, for various reasons, towards anomalous conditions that may degenerate to such an extent as to cause large and long-lasting shutdowns. In such conditions actions must be t...
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A generation and transmission system may tend, for various reasons, towards anomalous conditions that may degenerate to such an extent as to cause large and long-lasting shutdowns. In such conditions actions must be taken that may, on one hand, prevent the system from arriving at a partial or total shutdown (ante mortem actions) and, on the other hand, allow a quick restoration of the electric power system in case shutdown has occurred (post mortem actions). As far as ENEL electric power system is concerned, the ante mortem actions are briefly presented and then the post mortem actions are described, mainly the restoration plan drawn up by ENEL.
A long range reactive power planning algorithm is extended to solve the operations planning capacitor scheduling problem. The optimization method minimizes the amount of controlled switching (of capacitors and inducto...
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A long range reactive power planning algorithm is extended to solve the operations planning capacitor scheduling problem. The optimization method minimizes the amount of controlled switching (of capacitors and inductors) during light load conditions to prevent abnormally high voltages from occurring for both normal and post-contingency operating states. The optimization model simultaneously incorporates the effects of a number of contingencies and includes all load bus voltages as constraints. Test results of the methodology using a Pennsylvania-New Jersey-Maryland Interconnection (PJM) model are presented.
In order to keep a correct voltage on an electrical system, various means must be implemented in substations and in power plants. Both to improve the quality of supply (better regulation of voltage, decreasing the pro...
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In order to keep a correct voltage on an electrical system, various means must be implemented in substations and in power plants. Both to improve the quality of supply (better regulation of voltage, decreasing the probability of emergency situations) and to make easier the system operation, E. D. F. has implemented an automatic control of the voltage of the whole power system. This control makes the reactive power production of the generators dependent on the voltage in a few number of nodes of the network carefully selected. As far as capacitors are used on the high voltage systems, it is necessary to coordinate operation of this capacitors with this automatic control of the voltage. This paper describes the studies and the achievements of E. D. F. in this field.
The materials of the symposium contain 68 papers classified into the next sections: Large scale systems modeling, stability of large scale systems, hierarchical and decentralized control, order reduction and time deco...
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The materials of the symposium contain 68 papers classified into the next sections: Large scale systems modeling, stability of large scale systems, hierarchical and decentralized control, order reduction and time decomposing techniques, multicriteria optimization and game theory, decision process and production planning, powersystemssystems, traffic control problems, network and related problems, other applications. Refs. Technical and professional papersfrom this conference are indexed with the conference code no. 00037 in the Ei Engineering Meetings (TM) database produced by Engineering Information, Inc.
The materials of the symposium contain 68 papers classified into the next sections: Large scale systems modeling, stability of large scale systems, hierarchical and decentralized control, order reduction and time deco...
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The materials of the symposium contain 68 papers classified into the next sections: Large scale systems modeling, stability of large scale systems, hierarchical and decentralized control, order reduction and time decomposing techniques, multicriteria optimization and game theory, decision process and production planning, powersystemssystems, traffic control problems, network and related problems, other applications. Refs. Technical and professional papersfrom this conference are indexed with the conference code no. 00037 in the Ei Engineering Meetings (TM) database produced by Engineering Information, Inc.
The main volume contains 68 papers, and a supplementary volume contains 3 papers. The papers in the main volume are clssified into 14 groups as follows: powersystems, Industrial Process control, Socio-Economic System...
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The main volume contains 68 papers, and a supplementary volume contains 3 papers. The papers in the main volume are clssified into 14 groups as follows: powersystems, Industrial Process control, Socio-Economic systems Analysis and Management, Sparse Sets of Algebraic Equations, Stability Analysis, control System Analysis, Mathematical Programming Techniques, control System Synthesis, Optimal control and Filtering, Multicriteria Decision Problems, Decentralized control, Multilevel control Problems, Coordination Techniques, and Nonstandard Problems and Approaches. The first three groups collect papers falling in three different and important application areas. Due to the variety of the covered topics, a few other application oriented works have been collected in the subsequent ″theory devoted″ group, according to their main technical characteristics. The next three groups, namely 4 to 6, deal with the analysis of complex composite systems, while groups from 7 to 9 essentially deal with the application of decomposition techniques to the solution of relatively standard optimization and design problems. Groups 10 to 13 are concerned with generalized (multicriteria, multiperson, multilevel) decision and control problems, whereas the last group collects papers presenting problems or approaches which are still commonly referred to as nonstandard or nonconventional within the field of large scale systems. The 71 individual papers are indexed separately.
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