Scheduled System Maintenance:
On May 6th, single article purchases and IEEE account management will be unavailable from 8:00 AM - 5:00 PM ET (12:00 - 21:00 UTC). We apologize for the inconvenience.
By Topic

Energy Conversion, IEEE Transactions on

Issue 1 • Date March 1996

Filter Results

Displaying Results 1 - 25 of 29
  • 1995 Combined Index

    Publication Year: 1996
    Save to Project icon | Request Permissions | PDF file iconPDF (10530 KB)  
    Freely Available from IEEE
  • Determination of the installation site and optimal capacity of the battery energy storage system for load leveling

    Publication Year: 1996 , Page(s): 162 - 167
    Cited by:  Papers (14)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (480 KB)  

    This study aims to show methods of determining the installation site and the optimal capacity of a battery energy storage system (BESS) to attain load leveling. The methods are based on the hardware characteristics of 20 kW/100 kWh and 1 MW/4 MWh prototype BESSs, which are already developed and are being developed, respectively. The candidate site of BESS installation is the secondary side of a distribution substation's main transformer (MTR). These tasks are performed by first classifying the load pattern of an MTR and comparing it to the load pattern of a total power system. If the load factor improves, then the location is determined to be a BESS installation site. Subsequently, the optimal BESS capacity for an MTR is determined using the given operation pattern, the charging/discharging characteristics and efficiency. Computational experimentation was performed on an actual distribution system in Korea. After determining the optimal capacity, the authors verified that installing the BESS on the selected MTR improved both daily and nightly load factors View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • MHD-steam thermal power plant electrical stations with zero stack emission

    Publication Year: 1996 , Page(s): 194 - 199
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (464 KB)  

    A system study of a combined cycle MHD-steam thermal power plant electrical station with zero stack emission through recirculation of CO 2, is presented. The design of the MHD generator of the topper is done by means of a quasi-one dimensional optimization model. The technology of the components is conventional. An overall efficiency larger than 40% for power plants with thermal power inputs above 1000 MWth, is obtained View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Implementation of a fuzzy logic PSS using a micro-controller and experimental test results

    Publication Year: 1996 , Page(s): 91 - 96
    Cited by:  Papers (30)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (544 KB)  

    Implementation of a fuzzy logic based power system stabilizer using the general purpose low cost Intel 8051FA microcontroller is described in this paper. Results of extensive on-line tests performed for a variety of disturbances and operating conditions are presented. These results amply demonstrate the effectiveness of the fuzzy logic based stabilizer View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Influence of photovoltaic power generation on required capacity for load frequency control

    Publication Year: 1996 , Page(s): 188 - 193
    Cited by:  Papers (33)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (508 KB)  

    We developed a mathematical model to evaluate the impact of small (rooftop) photovoltaic (PV) power-generating stations on economic and performance factors for a larger scale power system, and applied this model to the Tokyo metropolitan area. We used solar radiation data from five local meteorological stations to estimate both the individual and aggregate contributions of the projected PV stations to the local power grid. We found that an electrical power system containing a 10% contribution from PV stations would require a 2.5% increase in load frequency control (LFC) capacity over a conventional system. The break-even cost for PV power generation was found to be relatively high for contribution levels of less than 10%. Higher proportions of PV power generation gave lower break-even costs, but economic and LFC considerations imposed an upper limit of about 10% on PV contributions to the overall power systems View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The power regulation of a PWM type superconducting magnetic energy storage unit

    Publication Year: 1996 , Page(s): 168 - 174
    Cited by:  Papers (16)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (672 KB)  

    This paper presents an analysis of the power regulation of a SMES unit under PWM switching control. The criteria for executing a power limit scheme to maintain power flows of the SMES unit within a controllable range are described. A general technique for design of power controllers based on the power limit scheme is developed. Two illustrative examples, being separate active and reactive power compensations of a model power system, are presented. The study indicates that active power priority control plays a dominant role in the power regulation of a SMES unit. Experimental results for two examples are also presented View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Opportunities for the integration of intermittent renewable resources into networks using existing storage

    Publication Year: 1996 , Page(s): 181 - 187
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (628 KB)  

    The absorption of energy from intermittent resources (IR) into the existing storage in a system is described. A subsequent reshaping of this energy to sell it as firm energy is possible by exploiting the diversity in demands and generations. An algorithm to optimize the installations of IR to maximize firm sales is presented View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A fuzzy adapted field-oriented mechanism for induction motor drive

    Publication Year: 1996 , Page(s): 76 - 83
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (584 KB)  

    The detuning of an indirect field-oriented induction motor drive due to variation of rotor resistance may lead to low efficiency and poor transient response. To improve this, an induction motor drive with a fuzzy adapted field-oriented mechanism is proposed. During steady state conditions, an adapted slip angular speed signal is synthesized by a fuzzy controller and used to adjust the original estimate of slip angular speed signal such that minimum stator current is obtained. When the transient due to command or load torque change occurs, the fuzzy tuning mechanism is temporarily inhibited and the final value of the adapted signal is held. A discrete two-degree-of-freedom controller (2DOF) is designed to yield good speed command tracking and load regulating responses. The effectiveness of the proposed motor drive is demonstrated experimentally View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Capacitor break-point partitioning of multi-machine systems for numerical integration by parallel processing

    Publication Year: 1996 , Page(s): 1 - 7
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (812 KB)  

    The ability to partition multimachine power system equations is very desirable because it enables the differential equations to be numerically integrated by many processors in parallel. This paper examines the reason for the present difficulty in achieving “partitioning”. The finding is that the “natural laws” are favorable to “partitioning” and the difficulty has arisen from the man-made assumption of neglecting the “electrostatic voltages” which accompany the magnetic induction process. By taking advantage of the capacitors which are present naturally in the power system, one can, in principle, use them as break-points for partitioning. The feasibility of the method is demonstrated in real-time simulations of a two-turbogenerator system by parallel processors View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Design of augmented fuzzy logic power system stabilizers to enhance power systems stability

    Publication Year: 1996 , Page(s): 97 - 103
    Cited by:  Papers (32)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (640 KB)  

    This paper presents an augmented fuzzy logic power system stabilizer (PSS) for stability enhancement of multimachine power systems. In order to accomplish a satisfactory damping characteristic over a wide range of operating points, speed deviation (Δω) and acceleration (Δω) of a synchronous generator were taken as the input signals to the fuzzy controller. It is well known that these variables have significant effects on damping the generators' shaft mechanical oscillations. A modification of the terminal voltage feedback signal to the excitation system as a function of the accelerating power on the unit, is also used to enhance the stability of the system. The stabilizing signals are computed using the standard fuzzy membership function depending on these variables. The performance of the proposed augmented fuzzy controller is compared to an optimal controller and its effectiveness is demonstrated by a detailed digital computer simulation of a single machine infinite bus and a multimachine power systems View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Reclosing torques of large induction motors with stator trapped flux

    Publication Year: 1996 , Page(s): 84 - 90
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (508 KB)  

    Large induction motors are subjected to high transient torques following the rapid reconnection of the supply. The paper shows that these torques have oscillatory components with speed dependent frequencies. These components may result in high torsional torques if the supply is reconnected at an unfavorable instant; when the frequency of one of the torque components coincides with the natural torsional frequency. However, this high torque can be avoided by the proper choice of the reclosing instant View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A transient induction motor model including saturation and deep bar effect

    Publication Year: 1996 , Page(s): 8 - 15
    Cited by:  Papers (38)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (808 KB)  

    Transient cage induction motor models for use in inverter-fed drives and controllers are reviewed. A simple transient model is presented that includes rotor deep bar effect and magnetic saturation of the magnetising and rotor leakage flux paths. The improved model requires motor details in the form of simple impedance versus frequency characteristics which can be obtained from a variety of external sources. These can range typically from detailed steady-state finite-element solutions to simple experimental measurements. The model is verified experimentally using a 75 kW, 4 pole vector controlled AC motor drive View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Emission constrained unit-commitment (ECUC)

    Publication Year: 1996 , Page(s): 132 - 138
    Cited by:  Papers (24)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (556 KB)  

    This paper presents a short-term unit commitment approach that incorporates environmental externalities into electric utility operations decision-making. The suggested approach identifies the least cost action for achieving daily or weekly emission targets. The problem formulation includes all standard system constraints, and explicitly addresses variable emission during start-up, operation, and shut-down of electric generating units. The problem is solved using a Lagrangian relaxation-based algorithm which offers a practical approach to the emission constrained unit commitment problem View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Source of induction motor bearing currents caused by PWM inverters

    Publication Year: 1996 , Page(s): 25 - 32
    Cited by:  Papers (118)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (816 KB)  

    The recent increase of bearing damage in induction machines driven by transistorized inverters has spurred activity on possible causes related to PWM inverters. This paper looks into a typical power conversion system from this perspective. It identifies the existence of the common mode voltages produced in all types of converters. A hypothesis is then proposed to explain the bearing current problem. In particular, it is shown that in an inverter-motor system the common mode voltages generated by a PWM inverter, which are attributed to PWM switching harmonics, couple through parasitic capacitances from stator windings to the rotor body and then returns through the motor bearings to the commonly grounded stator case as a closed loop circuit. The hypothesis is verified by experimental measurement of common mode coupling currents and true bearing currents in a specially modified induction motor. Solutions are then provided to suppress the bearing currents View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Control of subsynchronous resonant modes in a series compensated system through superconducting magnetic energy storage units

    Publication Year: 1996 , Page(s): 175 - 180
    Cited by:  Papers (18)  |  Patents (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (480 KB)  

    A simple and novel strategy for damping subsynchronous resonant oscillations through control of converter firing angles of a superconducting magnetic energy storage system (SMES) is proposed. The strategy is derived such that the current injected or drawn by the SMES compensates for any deviation in real and reactive power in the system. The proposed control has been tested on the IEEE second benchmark model for subsynchronous resonance studies. It has been found to eliminate the slowly growing transients resulting from the unstable modes very effectively. The control algorithm is simple and its realization will require very little hardware View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Finite element calculation of double-cage rotor equivalent circuit parameters

    Publication Year: 1996 , Page(s): 41 - 48
    Cited by:  Papers (13)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (652 KB)  

    This paper describes the use of a saturable single slot finite element model to determine the resistances and reactances of a double-cage rotor, allowing for the MMF balancing effect of the stator currents. The method is verified by comparing the impedances calculated for an unsaturated rotor with rectangular bars with their analytically determined counterparts. The model requires the user to specify both rotor frequency and current per slot. The effect of magnetic saturation is examined, and it is demonstrated that care must be taken in the choice of current at low frequencies, to avoid conditions of excessive saturation, leading to unrealistic values for inductances View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • PSS performance as affected by its output limiter

    Publication Year: 1996 , Page(s): 118 - 124
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (668 KB)  

    The effects of control limits of power system stabilizers (PSS) have been studied using the Transient Stability Simulation Package (TSSP) and a real-time simulator. Extensive simulations were carried out for three different power systems with PSSs using either electrical power or speed deviation as input signal. Results from batch and real-time simulations are in agreement with each other for the cases studied. It has been concluded that higher PSS output limit settings can achieve added damping and enhance transient stability. They yield excellent PSS performance during major system disturbances View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Interaction force analysis of transverse flux linear switched reluctance machine by Fourier projection method

    Publication Year: 1996 , Page(s): 62 - 69
    Cited by:  Papers (13)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1168 KB)  

    Since the transverse flux linear switched reluctance machine (TFLSRM) has a different structure, relative to the rotating switched reluctance machine (SRM) system, this paper proposes an efficient finite-element-based Fourier projection method to evaluate its force effect and transient phenomena. Due to the generated thrust and normal forces being two primary sources providing the machine moving operation, the relation between switching status and force change under different conditions is investigated. The advantages of the proposed technique are confirmed by simulation results, and the accuracy is also illustrated with experimental measurements. It is believed that the proposed method will provide a good guide to interaction force analysis and switching control design for related SRM systems View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A systematic approach to performance weights selection in design of robust H PSS using genetic algorithms

    Publication Year: 1996 , Page(s): 111 - 117
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (520 KB)  

    Selection of suitable performance weights is the main problem in design of a robust H power system stabilizer (PSS). In this paper, a systematic and automated approach based on genetic algorithms (GAs) is proposed. It gives rise to selection of optimal performance weights without any trial and error attempt. The resulting H PSS performs quite satisfactorily under a wide range of turbogenerator operating conditions and is robust against unmodelled low-damped torsional modes. It also provides sufficient robustness against significant changes in transmission line configuration and parameters View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Evaluation of advanced fuzzy logic PSS on analog network simulator and actual installation on hydro generators

    Publication Year: 1996 , Page(s): 125 - 131
    Cited by:  Papers (30)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (840 KB)  

    This paper presents the experimental evaluation of an advanced fuzzy logic PSS on the analog network simulator at the Research Laboratory of Kyushu Electric Power Co., Inc. The proposed power system stabilizer (PSS) is set up by using a personal computer with A/D and D/A conversion interfaces. The personal computer based PSS was set on the analog network simulator to evaluate the effectiveness of the advanced fuzzy logic control scheme, and to provide sufficient data for the actual installation of the proposed PSS on hydro-units in the Kyushu Electric Power System. This paper also describes the actual installation of the proposed PSS on hydro-units in the Kyushu Electric Power System for the long term evaluation of the proposed PSS using its prototypes View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Optimizing AC-exciter design

    Publication Year: 1996 , Page(s): 16 - 24
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (816 KB)  

    This paper presents important concepts that are to be considered in designing an AC exciter of a brushless exciter. These concepts are important because, based on these concepts, such as physical proportions, magnetic flux densities, current densities and existing design performance, a method for synthesizing a group of designs can be produced for an optimal solution of brushless exciter design. Brushless exciters are multi-pole, high frequency machines with a rotating armature and a stationary field windings. Selection of exciter rating, rotor length and diameter, armature core and winding, flux level, armature slots, air gap size, armature winding connection, and winding pitch are discussed. Also, a summary table of a case study, which was done utilizing the concepts in this paper, is presented View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Neural network identification of power system transfer functions

    Publication Year: 1996 , Page(s): 104 - 110
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (568 KB)  

    This paper describes an investigation into the use of a multilayered neural network for measuring the transfer function of a power system for use in power system stabilizer (PSS) tuning and assessing PSS damping. The objectives are to quickly and accurately measure the transfer function relating the electric power output to the AVR PSS reference voltage input of a system with the plant operating under normal conditions. In addition, the excitation signal used in the identification procedure is such that it will not adversely affect the terminal voltage or the system frequency. This research emphasized the development of a neural network that is easily trained and robust to changing system conditions. Performance studies of the trained neural network are described. Simulation studies suggest the practical feasibility of the algorithm as a stand-alone identification package and as a portion of a self-tuning algorithm requiring identification in the strategy. The same technique applied to a forward modelling scheme can be used to test the damping contribution from different control strategies View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Lead acid battery storage configurations for improved available capacity

    Publication Year: 1996 , Page(s): 139 - 145
    Cited by:  Papers (15)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (416 KB)  

    Battery storage is a crucial element in alternative energy and electric vehicle systems. Three battery storage configurations: a conventional; a parallel; and a dual, were analyzed for both shallow cycle and deep cycle lead-acid batteries to determine if capacity improvement is achievable. Daily profiles for the weekly irradiance, daily loads, and ambient temperature are simulated. Cycle tests were performed monthly to determine the effect each configuration had on the available battery capacity. Results for each battery type differ. Available capacity was improved using the parallel configuration with shallow cycle batteries and the dual configuration with deep cycle batteries View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Calculation of machine winding electrical parameters at high frequencies for switching transient studies

    Publication Year: 1996 , Page(s): 33 - 40
    Cited by:  Papers (36)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (476 KB)  

    This paper describes a multiconductor transmission line approach for calculating the machine winding electrical parameters for switching transient studies. The technique is based upon the solution of the one dimension diffusion equation in the slot of electrical machines. The coil electrical parameters are calculated considering both the magnetic flux in the iron and in the air. Several practical formulations for calculating the winding electrical parameter are proposed which take into account the machine winding design characteristics. The computer models are validated by a comparison of measured and calculated results in two high voltage induction motors View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Magnetic circuit modeling of the field regulated reluctance machine. Part II: saturation modeling and results

    Publication Year: 1996 , Page(s): 56 - 61
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (488 KB)  

    This paper explores and offers solutions for two causes of simulation instabilities which occur when modeling machines using magnetic circuits. An algorithm for dynamic simulation of electric machines based on the magnetic circuit model (MCM) developed in part I of this paper is augmented to include the ability to model magnetic saturation without numerical oscillations. The resulting MCM algorithm is implemented in a digital computer program which is well suited for both simulation of transients in nonsinusoidally wound machines such as a field regulated reluctance machine (FRRM), and for design. The model developed is verified using a laboratory prototype FRRM, power converter, and controller. Results of computer simulations using the magnetic circuit model agree well with experimental machine data View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.

Aims & Scope

The IEEE Transactions on Energy Conversion includes in its venue the research, development, design, application, construction, installation, operation, analysis and control of electric power generating and energy storage equipment (along with conventional, cogeneration, nuclear, distributed or renewable sources, central station and grid connection). The scope also includes electromechanical energy conversion, electric machinery, devices, systems and facilities for the safe, reliable, and economic generation and utilization of electrical energy for general industrial, commercial, public, and domestic consumption of electrical energy.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Juri Jatskevich
University of British Columbia