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Generation, Transmission and Distribution, IEE Proceedings-

Issue 4 • Date Jul 1996

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Displaying Results 1 - 10 of 10
  • Evolutionary programming approach to reactive power planning

    Page(s): 365 - 370
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (576 KB)  

    The paper proposes an application of evolutionary programming (EP) to power system reactive power planning (RPP). RPP is a nonsmooth and nondifferentiable optimisation problem for a multiobjective function. Several techniques to make EP practicable have been developed. The proposed approach is demonstrated with the IEEE 30-bus power system. The comprehensive simulation results show that EP is a suitable method to solve the RPP problem. A conventional optimisation method is used as the comparison method. The comparison shows that EP is better than the conventional method in the RPP problem View full abstract»

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  • Spinning reserve allocation using response health analysis

    Page(s): 337 - 343
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (600 KB)  

    An approach to evaluate the degree of system well-being in the responding capability of a generation system is presented. The overall well being of a generation system in terms of its responding capability is identified as being healthy, marginal and at risk. A risk criterion, designated as the `generating system response state risk' (GSRSR), is used to determine the generating unit loading schedule. The committed units are loaded such that a specified GSRSR, an acceptable response health probability or both are satisfied. The concept of multiple criteria provides the system operator with considerable flexibility in selecting a meaningful reliability level for load dispatch. These concepts are illustrated by application to the IEEE reliability test system (IEEE-RTS) View full abstract»

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  • Capability of the static VAr compensator in damping power system oscillations

    Page(s): 353 - 358
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (476 KB)  

    The capability of the static VAr compensator (SVC) in damping power system oscillations is investigated on the basis of a Phillips-Heffron model of single-machine infinite-bus power systems. Analysis shows that the ability of the SVC to provide positive damping torque to power systems is influenced not only by the load conditions, as has been found previously, but also by the type (or parameters) of the generator and the strength of the SVC voltage control. It is found that the `dead point' of the SVC damping control function, which has been reported in two-area power systems, may also exist in a single-machine infinite-bus power system. All the conclusions in the paper have been obtained by theoretical analysis, which ensures their generality and validity in all power systems with the same basic structure, and are confirmed by numerical calculations and nonlinear simulations of an example power system View full abstract»

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  • Scheduling short-term hydrothermal generation using evolutionary programming techniques

    Page(s): 371 - 376
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (528 KB)  

    The authors present a novel evolutionary programming (EP) based algorithm for the short-term hydrothermal scheduling problem. To more realistically represent the relationship between the generation and amount of water discharge for hydroaggregates, the generation models of the hydroelectric power plants as well as thermal power plants are often expressed as nonlinear and nonsmooth curves with prohibited areas. The advantage of the proposed algorithm is that it is capable of determining the global or near global optimal solutions to such an optimisation problem with multiple local minima. The developed algorithm is illustrated and tested on two model systems. The test results are compared with those obtained using gradient search, simulated annealing and genetic algorithm methods. Numerical results show that the proposed EP-based algorithm can provide accurate solutions within a reasonable time View full abstract»

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  • Application of the controllable series compensator in damping power system oscillations

    Page(s): 359 - 364
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (488 KB)  

    In the paper, the application of the controllable series compensator (CSC) in damping power system oscillations is investigated on the basis of the Phillips-Heffron model, which is established for a general n-machine power system. The capability of the CSC damping control to provide damping to the power system is analysed in terms of its damping torque contribution both for single-machine infinite-bus and multimachine power systems. Brief guidelines for the design of the CSC damping controller are given and demonstrated on sample power systems View full abstract»

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  • Three-phase optimal harmonic power flow

    Page(s): 321 - 328
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (732 KB)  

    A new three-phase optimal-harmonic-power-flow (TOHPF) method is proposed. It is designed to minimise the three-phase power losses and the total three-phase harmonic voltage distortion while satisfying the three-phase-power-flow equations, three-phase harmonic-power-flow equations, three-phase security constraints, and the three-phase harmonic standard etc. A two-level algorithm is used to solve the problem: the master level determines the settings of three-phase compensators and taps; the slave level includes subproblems which involve cases of fundamental and harmonic frequencies separately. The test results for two power systems show the applicability of the proposed method View full abstract»

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  • Tracing the flow of electricity

    Page(s): 313 - 320
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (804 KB)  

    Continuing trends towards the deregulation and unbundling of power transmission services has resulted in the need to assess what impact a particular generator or load has on the power system. A new method of tracing the flow of electricity in meshed electrical networks is proposed which may be applied to both real and reactive power flows. The method allows the assessment of how much of the real and reactive power output from a particular power station goes to a particular load. It also allows the assessment of contributions of individual generators (or loads) to individual line flows. A loss-apportioning algorithm has also been introduced which allows the breakdown of the total transmission losses into components to be allocated to individual loads or generators. The method can be useful in providing additional insight into power system operation and can be used to modify existing tariffs of charging for transmission loss, reactive power and transmission services View full abstract»

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  • Continuous harmonic state estimation of power systems

    Page(s): 329 - 336
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (776 KB)  

    The paper presents a system-wide continuous harmonic state estimator of three-phase asymmetric power systems, with development of its reduced mathematical models and algorithm, as well as its application to a New Zealand test system. The complete harmonic information throughout the power system, including location and even type of harmonic source, is estimated from a few synchronised, partial and asymmetric measurements at selected buses and lines far from the harmonic source View full abstract»

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  • Applications of customer outage costs in system planning, design and operation

    Page(s): 305 - 312
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (780 KB)  

    Although the basic function of an electric utility company is to supply power economically and at acceptable levels of continuity and quality, the emphasis placed on these aspects during planning, design and operation depends on the level of power system development. Further development of developed power networks is dominated by technological changes and concern for strict economic operation, quality of service and reliability. The authors only address issues related to reliability and consider distribution systems which are a part of developed networks from this vantage point. It has been suggested that existing standards do not adequately address customers' concerns over reliability. To redress this, the authors address such concerns by presenting customer outage costs (COC), which are considered as proxies for reliability worth, as a criterion for providing additional justification for alternative distribution system plans, designs or operating policies. To demonstrate the application in these respects, two distribution networks based on realistic 33 kV power systems are analysed, and the effects of network modifications or changes in operating policies on traditional reliability indices and COC studied View full abstract»

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  • Combined active and reactive dispatch with multiple objectives using an analytic hierarchical process

    Page(s): 344 - 352
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (812 KB)  

    A fully coupled active and reactive dispatch using linear programming and an analytic hierarchical process is developed. The purpose of combined active and reactive dispatch (CARD) is to achieve the overall objective of minimum generation cost and to improve the distribution of reactive power and voltage, subject to constraints which ensure system security. Security is defined as the maintenance of individual circuit flows, generator reactive power output and system voltages within limits under normal system conditions and contingency cases. The weighting factors of different kinds of objective functions are determined by an analytic hierarchical process (AHP), considering the relative importance of these objective functions. The developed method is demonstrated through its application to determine the combined active and reactive dispatch of a 713-node network representing a practical power system, provided by the National Grid Company plc (NGC). The calculation results show that a good balance can be achieved among the various objectives and a satisfactory generation pattern is obtained from the enhanced CARD program View full abstract»

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