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Industrial Electronics, IEEE Transactions on

Issue 6 • Date Dec. 1995

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Displaying Results 1 - 11 of 11
  • Control system for three-phase active power filter which simultaneously compensates power factor and unbalanced loads

    Publication Year: 1995 , Page(s): 636 - 641
    Cited by:  Papers (72)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (619 KB)  

    The effectiveness of an active power filter depends basically on three characteristics: (a) the modulation method used; (b) the design characteristics of the PWM modulator; and (c) the method implemented to generate the reference template. For the last characteristic there are many methods, most of them complicated and hence difficult to implement and adjust. In this paper, a new method, which has simplicity at its main characteristic, is presented. The method is based on "sample and hold" circuits, synchronized with the peak value of the phase-to-neutral mains voltage. This method is useful for shunt active power filters and is capable to eliminate harmonics, compensate power factor, and correct unbalance problems simultaneously. It also has the ability to slow-down sudden transient changes in the load. Experimental results, with the reference template obtained with the method, are presented in the paper. View full abstract»

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  • Diagnostic technique for power systems utilizing infrared thermal imaging

    Publication Year: 1995 , Page(s): 615 - 628
    Cited by:  Papers (12)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2024 KB)  

    A real-time diagnostic and control technique has been developed for use in electronic circuits whose thermal signature can be correlated to their operating status. Successful implementation of this diagnostic scheme in proof-of-concept experiments required the incorporation of several technological issues into a complete system that has the capability to detect potential fault modes in the system under observation. Included was the ability to: (1) use infrared optical fibers to view components within enclosures and complex geometries; (2) obtain the thermal profile of the system; (3) process and analyze thermal data; (4) implement a simulated artificial neural network to determine the particular condition or fault corresponding to the thermal signature; and (5) perform any necessary corrective action in a timely manner. Infrared optical fibers, routed from individual components to an external array of connectors, were used to collect and transmit energy radiated from those components. An infrared thermal imaging camera was utilized to scan the fiber array and produce an image corresponding to the thermal profile; thus, the thermal signature was obtained in a manner which was neither thermally nor electrically intrusive. Temperature data was then transmitted via an interface bus from the camera system to the control computer where information was converted into a form suitable for input into a trained artificial neural network View full abstract»

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  • Experimental evaluation of adaptive and robust schemes for robot manipulator control

    Publication Year: 1995 , Page(s): 653 - 662
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (896 KB)  

    In this paper, adaptive and robust control schemes are compared in the tracking control of robot manipulator. In adaptive control, the authors classify the adaptive control laws that have been proposed into three types. They show that the most important difference among them is that in their PD gains. They investigate their tracking performances by laboratory experiment and show that they can have similar performances by adjusting their equivalent PD gains almost equally. In robust control, two degree of freedom (TDOF) controller is examined. The authors demonstrate its strong disturbance rejection performance and robustness to parameter variation by experiment. They analyze the stability of TDOF controller against the payload change. Finally, through these experiments, they consider the advantages of adaptive and robust schemes for robot manipulator control View full abstract»

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  • Design and implementation of a demand-side multifunction battery energy storage system

    Publication Year: 1995 , Page(s): 642 - 652
    Cited by:  Papers (15)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (864 KB)  

    This paper presents a new control strategy in a battery energy storage system (BESS) for multifunction operation. The multifunction BESS operates in two modes: one is the parallel processing mode which can play as an active filter, a power conditioner, or a voltage stabilizer; and the other is the stand-alone mode which acts as a conventional uninterruptible power supply. Basic principle from the conventional control method is used and modified to accomplish the desired operation function. The proposed theoretical formulations are verified by system analysis and simulation to present its performance. A laboratory prototype is fabricated and tested to support the proposed idea of a multifunction battery energy storage system View full abstract»

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  • Neutral-point-clamped inverter with improved voltage waveform and control range

    Publication Year: 1995 , Page(s): 587 - 594
    Cited by:  Papers (10)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (788 KB)  

    A hysteresis controller-based PWM method for neutral point clamped (NPC) inverters is proposed. The closed-loop system uses the two-axis components of the transformed line-to-line voltage vectors as the control variables. In its linear control range, the PWM method includes two operating modes, namely, low and high references. At high references' mode, the output voltage is generated by switching among four vectors instead of three to improve the waveform generation. The proposed system has a linear control range 15.5% wider than conventional phase control methods. Furthermore, the control range can be easily expanded beyond the higher linear controllable range up to the square waveforms without suddenly increasing the waveform distortion. Therefore, the fundamental component of the output voltage can be smoothly and continuously controlled from zero up to square waveforms. The control circuit includes a hysteresis controller that is capable of stabilizing the neutral point potential variations within fixed limits during steady and transient states. The control method also offers high performance and fast response. Computer simulations and experimental results on a laboratory-tested motor drive are given to validate the proposed control scheme View full abstract»

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  • Nonlinear observer-based adaptive tracking control for induction motors with unknown load

    Publication Year: 1995 , Page(s): 579 - 586
    Cited by:  Papers (20)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (600 KB)  

    In this paper, we propose a nonlinear observer-based adaptive controller for induction motors with unknown load. With the use of the skew-symmetric property of induction motors, a two-stage design technique is applied to construct an observer-based controller for velocity tracking control. To demonstrate the effectiveness of the proposed scheme, a voltage-control type of drive system is set up to perform the task of velocity tracking. The main computing facility consists of two personal computers, PC 486 and PC 286, of which one is to perform the calculation of the control law and the other is to provide the function of pulse width modulation (PWM) and to generate the gating pulses. Satisfactory experimental results are shown in the paper View full abstract»

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  • A new UPS scheme provides harmonic suppression and input power factor correction

    Publication Year: 1995 , Page(s): 629 - 635
    Cited by:  Papers (28)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (576 KB)  

    A new parallel processing uninterruptible power supply (UPS) configuration is proposed in this paper. It provides active power line conditioning to minimize mains current distortion. This performance is superior to a conventional UPS. A prototype has been implemented and tested to verify its performance. The experimental results show that the input power factor of the proposed UPS is nearly unity, and the total harmonic distortion (THD) of the input current under nonlinear loading is only 3.618% for a mains voltage with THD of 1.633% View full abstract»

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  • Variable structure current control for induction motor drives by space voltage vector PWM

    Publication Year: 1995 , Page(s): 572 - 578
    Cited by:  Papers (13)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (516 KB)  

    In this paper, a variable structure current controller based on a space voltage vector PWM scheme is presented for induction motor drives. In this current controller design, only the current sensors are employed and we attempt to force the stator currents to be exactly equal to the reference currents rapidly. This proposed current controller, which is based on the space voltage vector PWM drive, exhibits several advantages in terms of reduced switching frequency, robustness to parameter variations, elimination of current/torque ripple, and improved performance in induction motor drive. It shows that the current control laws can be demonstrated in theory. Finally, simulation and experimentation results verify the proposed control scheme View full abstract»

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  • Soft-switching techniques in PWM converters

    Publication Year: 1995 , Page(s): 595 - 603
    Cited by:  Papers (93)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (816 KB)  

    A number of soft-switching pulse-width-modulated (PWM) converter techniques have been proposed, aimed at combining the desirable features of both the conventional PWM and resonant converters while avoiding their respective limitations. In this paper, three classes of zero-voltage soft-switching (PWM) converters (namely the zero-voltage-switched (ZVS) quasi-square-wave converters, ZVS-PWM converters, and zero-voltage-transition PWM converters) and two classes of zero-current soft-switching PWM converters (namely, the zero-current-switched PWM converters and zero-current-transition PWM converters) are reviewed, and their merits and limitations are assessed. Experimental results of several prototype of converters are presented to illustrate each class of converter View full abstract»

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  • Kalman filter and LQ based speed controller for torsional vibration suppression in a 2-mass motor drive system

    Publication Year: 1995 , Page(s): 564 - 571
    Cited by:  Papers (66)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (632 KB)  

    In this paper, a high-performance speed control for torsional vibration suppression in a 2-mass motor drive system, like a rolling mill which has a long shaft and large loadside mass or a robot arm which has flexible coupling, was studied. The speed control method which has better control response than a typical one in command following, torsional vibration suppression, disturbance rejection, and robustness to parameter variation, was proposed. The performance of command following, torsional vibration suppression, and robustness to parameter variation was satisfied by using a Kalman filter and LQ based speed control with an integrator. Also, disturbance rejection performance was improved through load torque compensation. Through various experiments of a real 22 kW field oriented controlled AC motor drive system having 2-mass mechanical system, the characteristics of the proposed speed controller and typical PI speed controller were compared and analyzed View full abstract»

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  • Small signal analysis of the LCC-type parallel resonant converter using discrete time domain modeling

    Publication Year: 1995 , Page(s): 604 - 614
    Cited by:  Papers (12)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (940 KB)  

    Discrete state-space modeling of the LCC-type parallel resonant power converter is presented. Using these large signal equations, small signal modeling of the power converter is obtained. Multiple loops have been used for the closed loop operation. State variable feedback control has been integrated with the linear small signal state-space model and the associated control aspects are studied. The small signal state-space model has been used to study the small signal behavior of the power converter for open loop and closed loop operation for parameters like control to output transfer function, audio-susceptibility and output impedance. Key theoretical results have been experimentally verified View full abstract»

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Aims & Scope

IEEE Transactions on Industrial Electronics encompasses the applications of electronics, controls and communications, instrumentation and computational intelligence for the enhancement of industrial and manufacturing systems and processes.

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Editor-in-Chief
Carlo Cecati
DISIM - Univ. degli Studi dell'Aquila
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