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Power Symposium, 1990., Proceedings of the Twenty-Second Annual North American

Date 15-16 Oct. 1990

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Displaying Results 1 - 25 of 49
  • Proceedings of the Twenty-Second Annual North American Power Symposium (Cat. No.90TH0343-4)

    Publication Year: 1990
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    Freely Available from IEEE
  • A predictor corrector algorithm in the parallel solution of power system dynamics

    Publication Year: 1990 , Page(s): 118 - 125
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (352 KB)  

    While software is being developed for automatically detecting parallelism in an otherwise serial code, concurrent research in developing parallel numerical algorithms is also useful. The authors compare the speedups obtained using both these approaches in the dynamic simulation of a power system. A sequential algorithm that can be automatically converted to execute in parallel is developed. An exp... View full abstract»

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  • Design and development of a line voltage detector

    Publication Year: 1990 , Page(s): 155 - 161
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    A voltage detector to determine whether a line is energized or not was designed and developed into a prototype. A voltage proportional to the line-to-neutral voltage is filtered through a third order bandpass filter, to obtain the triggering signal for the detector. The prototype was tested in the laboratory using a 1.5 kVA, 120/7200 V, single phase distribution transformer. the low voltage side o... View full abstract»

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  • Effect of geomagnetic-induced-current on power grids and communication systems: a review

    Publication Year: 1990 , Page(s): 251 - 262
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (444 KB)  

    The authors provide an up-to-date engineering review on the effect of geomagnetic-induced-current (GIC) on power systems and apparatus. The topics dealt with are effects on power systems; static VAr compensation and harmonic distortion; mitigation of GIC in power systems; measurements and instrumentation; effect of GIC on communication systems; and strategies for developing immunity from geomagnet... View full abstract»

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  • Effects of under-load tap changer (LTC) on power system voltage stability

    Publication Year: 1990 , Page(s): 298 - 303
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (372 KB)  

    The effect of load tap changer (LTC) action on a transformer's adjusted side voltage (usually the secondary side of step-down transformers) is evaluated when the tap position on LTC is raised (lowered) to increase (decrease) the adjusted side voltage. The effects of other measures such as series and shunt compensation and their combination with LTCs are also evaluated. A static representation mode... View full abstract»

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  • Building the basis for user interactive computing in slow transient and dynamic power system studies

    Publication Year: 1990 , Page(s): 14 - 21
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (564 KB)  

    The authors address the problem of slow transient and dynamic simulation of power systems on personal computers. An approach is presented for the systematic description and organization of the information and data pertaining to these studies, such as control system configuration and parameters, output selection, simulation scenario description, etc., in order to provide the basis for user interact... View full abstract»

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  • Speed control of series motors by means of thyristor bridges

    Publication Year: 1990 , Page(s): 428 - 434
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (228 KB)  

    The behavior of a single-phase gate controlled thyristor bridge supplying a R-L network is digitally simulated. The results are compared with an experiment on the same system to verify the correctness of the digital model. A series motor is digitally simulated together with the digital model of the thyristor bridge. Speed control of the series motor is achieved by controlling the gate signals to t... View full abstract»

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  • Corrosion and steel grounding

    Publication Year: 1990 , Page(s): 162 - 170
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (420 KB)  

    Based on the National Bureau of Standards statistical data on the corrosion of steel (M. Romanoff, 1957), an equation is developed to estimate the corrosion rate of underground steel that varies with soil resistivity, pH value, moisture and aeration. This formula, together with IEEE Standard 80-1986, is used in the design of steel grounding. formulae are also discussed on how to design proper cath... View full abstract»

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  • Phase-to-ground switching transients in EHV systems

    Publication Year: 1990 , Page(s): 203 - 210
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (296 KB)  

    The author outlines the effects of unequal pole closure of circuit breakers on the magnitudes of phase-to-ground overvoltages. A model of a short section of a 500 kV line is used. Results show that the mean value of the phase-to-ground voltage increases in both directions away from the zero switching angle where it shows a minimum. The minimum is more distinct in the case of sequential switching t... View full abstract»

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  • A new estimate of a heater/air conditioner duty cycle based on the maximum likelihood theory

    Publication Year: 1990 , Page(s): 136 - 144
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (364 KB)  

    The objective is to derive a duty cycle of a heater/air conditioner unit that correctly accounts for the effects of the driving process noise. The unit is modeled by using a stochastic hybrid state model driven by a white Gaussian process. Using the Kolmogorov backward equation, first passage theory, and the theory of maximum likelihood-estimation, a duty cycle is derived that shows the effects of... View full abstract»

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  • Modelling and simulation of the Chukha hydro power plant, Bhutan and the nearby Indian power system

    Publication Year: 1990 , Page(s): 398 - 404
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (364 KB)  

    The Chukha power plant in Bhutan consists of four units of 84 MW each of pelton wheel turbines operating under a head of 435 m. It is interconnected with a steam power plant at Farakka, India, consisting of four units of 100 MW each. The objectives of the study are (1) to model and simulate the speed and load changes of the two plants for a small step change of load applied anywhere in the power n... View full abstract»

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  • Single phase induction motor drive scheme for pump irrigation using photovoltaic source

    Publication Year: 1990 , Page(s): 415 - 427
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (432 KB)  

    The authors present the modeling and simulation of a solar powered induction motor drive for pump irrigation. The model can be used to relate input quantities like solar array voltage and current to outputs like speed and torque. The simulation of the unified system is presented and the results can be used to select the ratings of the various components. Using a harmonic elimination technique, the... View full abstract»

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  • An adaptive stabilizer for multimachine power systems

    Publication Year: 1990 , Page(s): 33 - 42
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    An adaptive model-following multimachine power system stabilizer (PSS) design technique is presented. Coordinated control signals are derived at the inputs of each generating unit using only local terminal measurements. A reference model is chosen for each machine to reflect the dynamic interaction between that machine and the rest of the interconnected network. For this purpose an adaptive parame... View full abstract»

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  • Study of transmission line magnetic fields

    Publication Year: 1990 , Page(s): 222 - 231
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (416 KB)  

    The authors present a review of magnetic field calculations associated with power frequency 3, 6, and 12-phase transmission lines. A computer program implemented using an IBM PC-XT is described briefly. The interactive program allows the user to calculate the two-dimensional electric and magnetic field parameters at any point near transmission lines. Plotting and mapping features are also availabl... View full abstract»

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  • Nonlinear oscillations and voltage collapse phenomenon in electrical power system

    Publication Year: 1990 , Page(s): 274 - 282
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (484 KB)  

    The authors focus on bifurcation of modes associated with both the generator and load dynamics to show the relations between two different critical states. The authors observe that a system encounters both oscillatory-type instability and collapse-type instability using a sample power system model developed by I. Dobson et al. (1988). In addition to the collapse-type instability reported by Dobson... View full abstract»

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  • Performance evaluation of a subnetwork solution for contingency selection

    Publication Year: 1990 , Page(s): 348 - 362
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (424 KB)  

    The authors examine the computational efficiency of subnetwork solutions. A statistical approach is used to evaluate the performance of the subnetwork solution on several systems. The authors suggest that the efficiency of the subnetwork solution as compared to the full solution depends on the contingency type and the system size. For convenience, the sparsity-oriented subnetwork solution with fas... View full abstract»

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  • A fast and reliable decoupled load flow method in rectangular coordinates

    Publication Year: 1990 , Page(s): 94 - 101
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (236 KB)  

    The authors present a novel version of the fast decoupled load flow method in rectangular coordinates. The decoupling procedure uses a flat start and is based on the second-order load flow method, which is decoupled by suitable manipulations. There are no simplifications in the derivation of the method and the resulting set of equations has the same accuracy as the original expressions. To evaluat... View full abstract»

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  • Robust design of dynamic compensator for HV AC power system

    Publication Year: 1990 , Page(s): 2 - 7
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (236 KB)  

    The authors present a method to design a robust dynamic compensator for reactive power modulation to improve the dynamic performance of high voltage AC power systems. The effect of nonlinear load on parameters of a dynamic compensator for reactive power modulation using a static VAr compensator (SVC) is investigated. The values of gain and zero of the dynamic compensator, which assign the same com... View full abstract»

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  • An optimal control strategy for power distribution system operation

    Publication Year: 1990 , Page(s): 327 - 335
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (360 KB)  

    An optimal control strategy for the operation of a power distribution system is proposed. The objective is to meet all load demands while maintaining a desired profile and achieving minimization of power losses in the distribution system. A set of control objects of the distribution system consisting of security, operational and economical control laws (constraints) is integrated into the strategy... View full abstract»

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  • Transient voltage dip analysis using the transient energy function method

    Publication Year: 1990 , Page(s): 264 - 273
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (540 KB)  

    It is shown that the transient energy function (TEF) method provides a fast approximate approach to voltage dip computations. The TEF method is used to predict the stability of a power system after a disturbance has occurred. The results of application of the technique to test power systems confirmed that the voltage dips predicted by the TEF method compare well with the values from time domain si... View full abstract»

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  • Simulation of induction machine starting transients using state variable techniques

    Publication Year: 1990 , Page(s): 405 - 414
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (392 KB)  

    A simple, fast, and accurate algorithm for determining induction machine starting transients is presented. The fifth-order system of differential equations is divided into three lower-order subsystems. An iterative solution technique utilizing discrete time linear state-variable techniques is used for solution of two linear subsystems instead of the commonly used inefficient numerical techniques. ... View full abstract»

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  • A SPICE model for gate turn-off thyristors

    Publication Year: 1990 , Page(s): 145 - 154
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (640 KB)  

    The authors present a SPICE gate turn-off thyristor (GTO) model which simulates both the static negative differential resistance characteristics and the dynamic switching characteristics. The model consists of a parallel connection of two-transistors, three-resistor (2T-3R) cells. The accuracy of the model depends on the number of 2T-3R cells used. This multi-cell GTO model enables one to simulate... View full abstract»

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  • A pattern analysis approach for topology determination, bad data correction and missing measurement estimation in power systems

    Publication Year: 1990 , Page(s): 363 - 372
    Cited by:  Papers (4)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (624 KB)  

    The authors propose a novel methodology for the combined solution of the topological identification, observability analysis and bad data processing problems in power systems. The idea is to provide, in a very fast way, a reliable input database for the state estimator, without interacting with it. The solution is based on a pattern analysis approach. An efficient framework for solving data acquisi... View full abstract»

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  • A microprocessor based bus relay using a current transformer saturation detector

    Publication Year: 1990 , Page(s): 193 - 202
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (476 KB)  

    A microprocessor based bus protection scheme is presented. It uses a novel technique to overcome the problem of current transformer saturation. The protection algorithm uses a combination of the percentage differential principles and the phase comparison technique. With a sampling rate of 1440 Hz (24 samples/cycle on a 60 Hz system) a realistic bus is considered for algorithm testing. With the inc... View full abstract»

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  • A spreadsheet model for residential magnetic field exposure

    Publication Year: 1990 , Page(s): 242 - 250
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (484 KB)  

    A spreadsheet program to estimate individual magnetic field exposure within a residence is described. The magnetic field exposure (MFE) program allows utilities a quick means of determining the relative magnetic field exposure for a specific customer without an extended measurement process. Magnetic field exposure is defined as the amount of magnetic field a person is being subjected to over a spe... View full abstract»

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