Issue 1 • March-1988
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Application and testing of a fiber optic communication system at Grand Coulee
Publication Year: 1988,Page(s):1 - 5
The rationale for applying fiber-optic technology in this application is discussed with emphasis on the related design considerations important in control and protection of this large hydroelectric facility. Brief summaries of hardware used and installation considerations are given. A discussion of factory and unique field testing, including electromagnetic-interference (EMI)-induced transient inf...Show More
Damping of subsynchronous resonance using excitation controllers and static VAr compensations: a comparative study
Publication Year: 1988,Page(s):6 - 13
Cited by: Papers (46)
The results of a comparative study on the application of two countermeasures, i.e. the excitation controller and the static VAr compensator (SVC), for damping of subsynchronous resonance (SSR) are presented. To stabilize all the SSR modes, a unified approach based on modal control theory is proposed for the design of the excitation controller and the SVC, which are essentially dynamic output feedb...Show More
A frequency domain method for tuning hydro governors
Publication Year: 1988,Page(s):14 - 17
Cited by: Papers (16)
A frequency domain method to determine the optimum values for the parameters of a proportional-integral-derivative (PID) governor is presented. The method readily handles detailed models of turbine-penstock, gate dynamics, and other system components. The main advantages of the method are that it is computationally simple, that it does not involve any iterations, and that the designer can prespeci...Show More
Developing a mini-hydro plant in the remote Canadian North
Publication Year: 1988,Page(s):18 - 25
Cited by: Papers (2)
The implementation of a 1150 kW mini-hydro-generation plant at Wemindji, a remote community in Northern Canada, is described. A number of studies and investigations of the overall costs of energy to the community led to the choice of a mixed energy-supply system consisting of hydro, diesel, and firewood. The 1150 kW hydro power plant constitutes the main element in this energy supply. Details are ...Show More
Economic-emission load dispatch through goal programming techniques
Publication Year: 1988,Page(s):26 - 32
Cited by: Papers (145)
The economic-emission load dispatch problem which accounts for minimization of both cost and emission is a multiple, conflicting-objective function problem. Goal programming techniques are most suitable for such type of problems. Here, the economic-emission load dispatch problem is solved through linear and nonlinear goal programming algorithms. The application and validity of the proposed algorit...Show More
Automatic generation control for hydro systems
G.L. Kusic;J.A. Sutterfield;A.R. Caprez;J.L. Haneline;B.R. Bergman
Publication Year: 1988,Page(s):33 - 39
Cited by: Papers (25)
The authors present the decision of an automatic generation control (AGC) system implemented with digital computers that periodically sample tie-line real power flows, line frequency, and generator power outputs. These analog signals are measured at 2-5 intervals and combined with desired interchange to obtain the area control error (ACE). The ACE digital quantity is allocated to regulating hydro ...Show More
Automatic generation control for hydro systems
G.L. Kusic;J.A. Sutterfield;A.R. Caprez;J.L. Haneline;B.R. Bergman
Year: 1988 | Volume: 3 | Issue: 1
An investigation of magnesium rotors in motor operated valve actuators
Publication Year: 1988,Page(s):40 - 43
Cited by: Papers (12)
Failure mechanisms of induction motors in the valve actuators of motor operated valves are investigated. It is found that motors which contain cast magnesium rotors are susceptible to cracking and melting after carrying locked rotor current for as little as 61 s. Safety-related valve actuator motors may be thermally protected near this value to ensure operability of valve actuators. Corrosion is a...Show More
An investigation of magnesium rotors in motor operated valve actuators
Year: 1988 | Volume: 3 | Issue: 1
The time variation of wind speeds and windfarm power output in Kansas
Publication Year: 1988,Page(s):44 - 49
Cited by: Papers (27)
On the Kansas plains, 1-min average wind speeds have high autocorrelations, with a value of about 0.9 with a lag of 32 min. In the winter, spring, and fall, 10 min average wind speed autocorrelation functions drop to 0 in 20 to 30 hr. Some cyclic behavior is noticed in the winter and fall correlations, with a period of several days. It is believed that this cyclic behavior is due to the passage of...Show More
The time variation of wind speeds and windfarm power output in Kansas
Year: 1988 | Volume: 3 | Issue: 1
A feasibility study of photovoltaic-fuel cell hybrid energy system
Publication Year: 1988,Page(s):50 - 55
The concept and feasibility study results of applying fuel cells to provide operational support to photovoltaic (PV) arrays are presented. Through simulation using actual data, it is shown that it is feasible to use fuel cells in coordination with PV to meet variable loads to either utility or stand-alone applications. The dynamic response required of the fuel cell to support the hybrid operation ...Show More
Relationship between stator core buckling, core losses, vibration and local over-temperatures
Publication Year: 1988,Page(s):56 - 63
Cited by: Papers (3)
Measurements on a hydrogenerator stator core during core test with higher-than-normal magnetic flux and extended test time provided the base for a study of interaction between buckling, local heat generation, hot spots, and vibration. The mechanism of buckling is analyzed. Curves were developed showing how the buckling influences the temperature at the bottom of the slot and between the stator coi...Show More
System performance improvement provided by a power conditioning subsystem for central station photovoltaic-fuel cell power plant
Publication Year: 1988,Page(s):64 - 70
Cited by: Papers (29)
An augmented power conditioning subsystem (APCS), which can improve the power system performance besides performing DC/AC power conversion, is proposed. With the benefits provided by the APCS, connecting photovoltaic cells, fuel cells, or their combination to a power system would provide not only additional sources and control of real power, but also additional economic reactive power control as w...Show More
Intelligent user interface for expert systems applied to power plant maintenance and troubleshooting
Publication Year: 1988,Page(s):71 - 77
A research and development project is under way to specify, design, construct, and evaluate a user interface system to meet the requirements of a knowledge-based system for gas turbine electronics equipment maintenance and troubleshooting. The user interface is a portable device with text display, video and overlay graphics display, voice recognition and speech production, special-function keypad,...Show More
Load-level-sensitive governor gains for speed control of hydrogenerators
Publication Year: 1988,Page(s):78 - 84
Cited by: Papers (8)
The application of load-level-sensitive gains to proportional-plus-integral speed control of hydrogenerators is discussed. Appropriate root configuration gain functions of wicket gate position are derived for isolated resistive loads. Computer programs are used to calculate these gains from model turbine data and system parameters. Root locus tuning is used to determine appropriate gains for infin...Show More
Load-level-sensitive governor gains for speed control of hydrogenerators
Year: 1988 | Volume: 3 | Issue: 1
Speed loop cancellation governor for hydrogenerators. I. Development
Publication Year: 1988,Page(s):85 - 90
Cited by: Papers (4)
Speed control governors for hydrogenerators utilize a proportional-integral (PI) control with constant gains. Given the nonlinear characteristics of the installations, the result is compromised speed and power transients for step load changes. The PI control is not able to provide a responsive power response while maintaining the desired speed transient. The development of a control strategy that ...Show More
Speed loop cancellation governor for hydrogenerators. I. Development
Year: 1988 | Volume: 3 | Issue: 1
Speed loop cancellation governor for hydrogenerators. II. Application
Publication Year: 1988,Page(s):91 - 94
Cited by: Papers (6)
For pt.I see ibid., vol.3, no.1, p.85-90 (1988). The essential dynamics for a hydrogenerator supplying a large grid may be represented by two control loops: the first for power and the second for speed. Previously, the authors developed a governor design intended to neutralize the speed loop's destabilizing effects while tuning for improved load tracking. The practical implementation of such a con...Show More
Speed loop cancellation governor for hydrogenerators. II. Application
Year: 1988 | Volume: 3 | Issue: 1
Effects of system parameters and circuit breaker characteristics on switching large synchronous motors
Publication Year: 1988,Page(s):95 - 101
Cited by: Papers (7)
Interturn insulation breakdown in stator windings resulted in the failure of thirteen 21000 HP synchronous motors. To confirm if the failures were caused by steep-front voltage surges, field measurements were conducted during switching operation of one of the compressed air magnetic circuit breakers in one of the affected plants. The results indicate that the number of motors running in parallel w...Show More
Design and demonstration of a microcomputer controller for an industrial sized DC motor
Publication Year: 1988,Page(s):102 - 110
A method of designing a three-phase fully-controlled thyristor-DC motor drive system with speed and/or current closed-loop control is presented. Both the circuit design and the control algorithm of a continuous (analog) controller or a digital controller design are studied. The effectiveness of the design method is well verified by extensive experiments. The dynamics of the system reasonably confi...Show More
Practical considerations concerning impulse voltage testing of form-wound coils for rotating machines
Publication Year: 1988,Page(s):111 - 115
Cited by: Papers (11)
The authors review the response of the windings of high-voltage AC rotating machines to system-generated transient voltages and also impulse test techniques and withstand levels of form-wound stator coils. Design tests on coils with a vacuum pressure impregnation (VPI) insulation system have confirmed very high turn-to-turn insulation strength well above actual system transient voltages. Because o...Show More
A finite element technique for calculating the magnet sizes and inductances of permanent magnet machines
Publication Year: 1988,Page(s):116 - 122
Cited by: Papers (40)
A method for calculating the magnet size, and the direct and quadrature axis reactances of permanent magnet synchronous machines, using the finite-element method is presented. In this method the machine is modeled by its equivalent d-q representation of armature MMF and the appropriate reactances are calculated from the magnetic energy in the magnetic field. This is in contrast to the conventional...Show More
Theoretical development and experimental verification of a DC-AC electronically rectified load-generator system model compatible with common network analysis software packages
A.A. Arkadan;T.J. Hijazi;N.A. Demerdash;J.G. Vaidya;V.K. Maddali
Publication Year: 1988,Page(s):123 - 131
Cited by: Papers (9)
A method for modeling electronically commutated DC-AC load-rectifier-generator systems is presented. The method is based on a modified form of Park's d-q-o transformation, and yields an equivalent system network which is compatible with most commonly known network analysis software packages. The method was used to develop a model for the simulation of the dynamic steady-state performance of a DC-A...Show More
Determination of negative-sequence resistance of turbo-generators from rated-frequency standstill tests
Publication Year: 1988,Page(s):132 - 139
Cited by: Papers (1)
Systematic analysis and comparison of standstill and rotational test results for a large number of turbogenerators in the range of 30 to 1300 MVA and having various damper systems, shows that the ratio of negative-sequence resistance to mean subtransient resistance varies in a narrow range of +or-10% around 0.85. This corresponds to an increase of about 1.5 to 1.85 times in the equivalent rotor re...Show More
Subsynchronous resonance phenomena considering skin effects in solid iron rotor turbo-generators
Publication Year: 1988,Page(s):140 - 148
The question of how the skin effects of the eddy current in the rotor of a synchronous generator influence the induction generation modes and the torsional interaction modes of the subsynchronous resonance (SSR) phenomena is addressed. The 3-D magnetic diffusion equation is solved in a round solid iron rotor to provide data for comparison and discussion purposes. The problem of representing skin d...Show More
Impulse voltage withstand capability of rotating machine insulation as determined from model specimens
Publication Year: 1988,Page(s):149 - 156
Cited by: Papers (8)
An evaluation of present-day turn and groundwall insulation is discussed. The surge breakdown voltage of unaged insulated specimens was evaluated at two rates of surge voltage rise; the values of breakdown voltage were compared to those obtained by direct voltage and 60 Hz alternating voltage. The insulations were then aged by voltage from conductor to ground and periodically evaluated for surge b...Show More
Parasitic torques in saturated induction motors
Publication Year: 1988,Page(s):157 - 163
Cited by: Papers (9)
A method for analyzing the performance of induction machines for parasitic torques is described. Such torques arise from the interactions of fundamental and harmonic components of air flux density due to geometrical considerations such as slotting, and saturation effects. Parasitic torques arise under balanced sinusoidal drive conditions. However, they are greatly exacerbated under nonsinusoidal d...Show More
Identification of parameters for superconducting generators having free or fixed outer rotor, based on tests and calculations
Publication Year: 1988,Page(s):164 - 171
Cited by: Papers (2)
The generator, with its concentric and in part solid and conductive parts, is represented by a shell model, and the parameters of the system of equivalent windings are first obtained approximately using a two-dimensional analytical field calculation. The effect of the finite length, which is neglected in this field calculation, is taken into account by variation of the model geometry and material ...Show More
Contact Information
Editor-in-Chief
Dionysios Aliprantis
Professor
Purdue University, Elmore Family School of Electrical and Computer Engineering
West Lafayette
USA
dionysis@purdue.eduContact Information
Editor-in-Chief
Dionysios Aliprantis
Professor
Purdue University, Elmore Family School of Electrical and Computer Engineering
West Lafayette
USA
dionysis@purdue.eduIEEE Account
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