IEEE Transactions on Industrial Electronics
IEEE Transactions on Industrial Electronics
Power Electronics
1. H.S.-H. Chung, S.Y.R. Hui, S.C. Tang, A. Wu, "On the use of current control scheme for switched-capacitor DC/DC converters," Trans. on Industrial Electronics, vol. 47, no. 2, pp. 238-244, Apr. 2000. Full Text Link
Abstract : This paper presents an investigation into the use of a current control scheme (CCS) and a comparison with a classical switching scheme for switched-capacitor (SC) step-down DC/DC converters. With the CCS, capacitors are charged with near-constant current, controlled by the gate-source voltage of MOSFETs. By paralleling two SC cells, the converter input current becomes continuous, resulting in much reduced conducted electromagnetic interference with other circuits fed by the same power supply. All MOSFETs are operated for half of the switching period, in order to improve the regulation capability. Static and dynamic behaviors of the converter with the CCS are predicted and confirmed in an experimental 36 W 12 V/9 V prototype
2. Bor-Ren Lin, Hsin-Hung Lu, "A novel PWM scheme for single-phase three-level power-factor-correction circuit," Trans. on Industrial Electronics, vol. 47, no. 2, pp. 245-252, Apr. 2000. Full Text Link
Abstract : This paper presents a control scheme for a single-phase AC-to-DC power converter with three-level pulsewidth modulation. A single-phase power-factor-correction circuit is proposed to improve the power quality. The hysteresis current control technique for a diode bridge, with two power switches is adopted to achieve a high power factor and low harmonic distortion. A control scheme is presented where the line current is driven to follow the reference sinusoidal current which is derived from the DC-link voltage regulator, the capacitor voltage balance compensator and the output power estimator. The blocking voltage of each power device is clamped to half of the DC-link voltage. The high power factor and low current total harmonic distortion are verified by computer simulations and hardware tests
3. K.K. Tse, H.S.-H. Chung, S.Y.R. Hui, H.C. So, "A comparative investigation on the use of random modulation schemes for DC/DC converters," Trans. on Industrial Electronics, vol. 47, no. 2, pp. 253-263, Apr. 2000. Full Text Link
Abstract : A comparative investigation on the use of random modulation schemes for DC/DC power converters is presented. The modulation schemes under consideration include randomized pulse position modulation, randomized pulsewidth modulation (PWM) and randomized carrier-frequency modulation with fixed and variable duty cycle. The paper emphasizes the suitability and applicability of each scheme in DC/DC power converters. Issues addressed include the effectiveness of randomness level on spreading the dominating frequencies that normally exist in constant-frequency PWM schemes, and the low-frequency power spectral density (PSD) of each scheme. The validity of the analyses is confirmed experimentally by using a DC/DC buck converter operating in the continuous conduction mode. The PSD of the output under each scheme is presented and compared
4. V.M. Pacheco, A.J. do Nascimento, V.J. Farias, J. Batista Vieira, L.C. de Freitas, "A quadratic buck converter with lossless commutation," Trans. on Industrial Electronics, vol. 47, no. 2, pp. 264-272, Apr. 2000. Full Text Link
Abstract : High switching frequency associated with soft commutation techniques is a new trend in switching converters. Following this trend, the authors present a buck pulsewidth modulation converter, where the DC voltage conversion ratio has a quadratic dependence on duty cycle, providing a large step-down. By introducing two resonant networks, soft switching is attained, providing highly efficient operating conditions for a wide load range at high switching frequency. Contrary to most of the converters that apply soft-switching techniques, the switches presented are not subjected to high switch voltage or current stresses and, consequently, present low conduction losses. The authors present, for this converter, the principle of operation, theoretical analysis, relevant equations and simulation and experimental results
5. Tsai-Fu Wu, Yu-Kai Chen, Yong-Heh Huang, "3C strategy for inverters in parallel operation achieving an equal current distribution," Trans. on Industrial Electronics, vol. 47, no. 2, pp. 273-281, Apr. 2000. Full Text Link
Abstract : A circular chain control (3C) strategy for inverters in parallel operation is presented in the paper. In the proposed inverter system, all the modules have the same circuit configuration, and each module includes an inner current loop and an outer voltage loop control. A proportional-integral controller is adopted as the inner current loop controller to expedite the dynamic response, while an H∞ robust controller is adopted to reach the robustness of the multimodule inverter system and to reduce possible interactive effects among inverters. With the 3C strategy, the modules are in circular chain connection and each module has an inner current loop control to track the inductor current of its previous module, achieving an equal current distribution. Simulation results of two-module and a three-module inverter systems with different kinds of loads and with modular discrepancy have demonstrated the feasibility of the proposed control scheme. Hardware measurements are also presented to verify the theoretical discussion
6. A.L. Shenkman, B. Axelrod, V. Chudnovsky, "A new simplified model of the dynamics of the current-fed parallel resonant inverter," Trans. on Industrial Electronics, vol. 47, no. 2, pp. 282-286, Apr. 2000. Full Text Link
Abstract : In this paper, the transient analysis of a current-fed parallel inverter, widely used in industrial applications (such as for the heating and melting of metals), is performed. A high-inductance smoothing inductor is usually connected in the input of the inverter and its load may be represented by a parallel resonant circuit characterized by high quality factor Q. To simplify the dynamic analysis of such an inverter, approximating it by a second-order switchless continuous dynamic link (i.e., RLC circuit) is suggested. The comparative analysis of the inverter and approximating circuit, whose parameters are properly chosen, shows the permissibility of such an approximation. It also shows how to assure desired aperiodic dynamic behavior. Then, by analyzing the approximating circuit, the expressions for inverter parameters are found. With these expressions, the values of a smoothing inductor, a compensating capacitance and a voltage factor, in order to ensure the aperiodic behavior of the inverter, can be calculated. The results of the proposed analysis were checked on laboratory and industrial prototypes of the above inverter. The theoretical and experimental results are in good agreement
7. Tsai-Fu Wu, Chien-Hsuan Chang, Yu-Hai Chen, "A fuzzy-logic-controlled single-stage converter for PV-powered lighting system applications," Trans. on Industrial Electronics, vol. 47, no. 2, pp. 287-296, Apr. 2000. Full Text Link
Abstract : This paper presents a fuzzy-logic-controlled single-stage power converter (SSC) for photovoltaic (PV)-powered lighting system applications. The SSC is the integration of a bidirectional buck-boost charger/discharger and a class-D series resonant parallel loaded inverter. The designed fuzzy logic controller (FLC) can control both the charging and discharging current, and can improve its dynamic and steady-state performance. Furthermore, a maximum power point tracker (MPPT) based on a perturb-and-observe method is also realized to effectively draw power from PV arrays. Both the FLC and the MPPT are implemented on a single-chip microprocessor. Simulated and experimental results obtained from the proposed circuit with an FLC have verified the adaptivity, robustness and feasibility
8. W. le Roux, J.D. van Wyk, "The effect of signal measurement and processing delay on the compensation of harmonics by PWM converters," Trans. on Industrial Electronics, vol. 47, no. 2, pp. 297-304, Apr. 2000. Full Text Link
Abstract : The effect of the delay time on the reference signal for compensation due to the data acquisition and digital signal processing is examined. The time delay will cause incorrect compensation and unwanted remaining nonactive power after compensation. A theoretical evaluation is done on the negative effect on compensation due to a single frequency distortion. This evaluation is expanded to handle multiple harmonic distortion to calculate the total theoretical ineffectivity of compensation for a specific load due to a specific time delay. This provides a method of calculating the ineffectivity caused by any delay in compensation, whatever the cause. Finally, the theoretical evaluations are validated by means of experimental results
Drive Control
9. Duwang Li, R. Tymerski, T. Ninomiya, "Chebyshev series integration method for transient simulation of switched networks," Trans. on Industrial Electronics, vol. 47, no. 2, pp. 305-314, Apr. 2000. Full Text Link
Abstract : An efficient integration routine based on the Chebyshev series expansion is given. Adoption of a Chebyshev expansion minimizes the order of the polynomial approximation which together with a number of basic properties of the expansion results in an efficient integration method. Furthermore, integration error control may conveniently be approached by monitoring the coefficients of the expansion. The proposed error control scheme varies the expansion order while keeping the step size fixed. A software program for the simulation of networks with ideal switches was written which incorporates the above features. Two examples, one of a nonswitched network and the other of a switched network, are given to illustrate the speed and accuracy of the program and effectiveness of the error control scheme. To quantify the advantages of the proposed scheme, a comparison is made with a previously developed simulator (viz., LAPS) and also a commercially available SPICE program
10. H.Z. Akpolat, G.M. Asher, J.C. Clare, "A practical approach to the design of robust speed controllers for machine drives," Trans. on Industrial Electronics, vol. 47, no. 2, pp. 315-324, Apr. 2000. Full Text Link
Abstract : This paper presents a practical approach to the robust speed control of electrical drives. The approach is based on sliding mode control (SMC), but it is shown how sampling time, system noise, actuation limit, and antiwindup integrator reduce the control to an online maximum-gain selection constrained by system noise. The paper proposes a trajectory-reference compensator and fuzzy gain interpolator to fully exploit the system actuation while avoiding chattering and remaining within specified noise limits, only the SMC switching line needs to be selected; the remaining control design is systematic and, thus, should be of interest to drive engineers in industry. Experimental results on a vector-controlled AC motor drive rig with variable-inertia loads are presented to verify the approach
11. S.R. Bowes, Jian Li, "New robust adaptive control algorithm for high-performance AC drives," Trans. on Industrial Electronics, vol. 47, no. 2, pp. 325-336, Apr. 2000. Full Text Link
Abstract : This paper presents a new robust structure for a model reference adaptive control (MRAC) controller for field-oriented-controlled (FOC) drives which requires no prior knowledge of the drive parameters and is guaranteed to provide global asymptotic stability of the closed-loop system. This structure simplifies the design and implementation of the adaptive controller requiring less effort to synthesis than a standard MRAC system. Discussion on theoretical aspects, such as selection of a reference model, stability analysis proof, gain adaptive process, steady-state error elimination, and robustness to unmodeled dynamics are included. The paper describes many practical aspects of the implementation, such as adaptive gain analysis, adaptive rate selection, the gain variation limits, gain windup prevention measure, and initial values. The new robust adaptive controller has been successfully implemented on an FOC drive and experiment results for dynamic tracking, sudden loading and unloading, and gains adaptation under different operation conditions are presented to support the robustness of the proposed controller
12. J. Hirai, Tae-Woong Kim, A. Kawamura, "Position-sensorless drive of linear pulse motor for suppressing transient vibration," Trans. on Industrial Electronics, vol. 47, no. 2, pp. 337-345, Apr. 2000. Full Text Link
Abstract : The linear pulse motor (LPM) has been widely used because of its simple structure and easy control without the use of feedback. However, degradation of the response performance occurs, resulting from the transient vibration which is inherent in the LPM. The fastest way to suppress the vibration is to close the control loop using the position feedback sensor, However, the straightforward use of such a sensor feedback leads to higher cost and complicated configuration, sacrificing the structural advantage of the LPM. Therefore, the authors propose a Kalman filter-based sensorless control for suppressing the transient vibration. In this proposed control method, the LPM mover position and speed are optimally estimated using an extended Kalman filter applied to the nonlinear state equations of excitation winding circuits. The effectiveness of this method is confirmed by experiments on a prototype LPM control system using a digital signal processor
13. Guchuan Zhu, L.-A. Dessaint, O. Akhrif, A. Kaddouri, "Speed tracking control of a permanent-magnet synchronous motor with state and load torque observer," Trans. on Industrial Electronics, vol. 47, no. 2, pp. 346-355, Apr. 2000. Full Text Link
Abstract : This paper is concerned with the speed tracking control problem for a permanent-magnet synchronous motor (PMSM) in the presence of an unknown load torque disturbance. After a brief review of the mathematical model of the PMSM, a speed tracking control law using the exact linearization methodology is introduced. The tracking control algorithm is completed by adding an extended observer which provides, on the one hand, the motor speed and acceleration and, on the other hand, estimates the unknown load torque. The stability of the closed-loop system composed of a nonlinear speed tracking controller and an observer is studied by the way of Lyapunov theory. Furthermore, the decoupling of the state observer and the load torque observer is discussed. Finally, a real-time implementation and the experimental results of the proposed control strategy are presented
14. Faa-Jeng Lin, Rong-Jong Wai, Chih-Hong Lin, Da-Chung Liu, "Decoupled stator-flux-oriented induction motor drive with fuzzy neural network uncertainty observer," Trans. on Industrial Electronics, vol. 47, no. 2, pp. 356-367, Apr. 2000. Full Text Link
Abstract : A stator-flux-oriented induction motor drive using online rotor time-constant estimation with a robust speed controller is introduced in this paper. The estimation of the rotor time constant is made on the basis of the model reference adaptive system using an energy function. The estimated rotor time-constant is used in the current-decoupled controller, which is designed to decouple the torque and flux in the stator-flux-field-oriented control. Moreover, a robust speed controller, which is comprised of an integral-proportional speed controller and a fuzzy neural network uncertainty observer, is designed to increase the robustness of the speed control loop. The effectiveness of the proposed control scheme is demonstrated by simulation and experimental results
15. K.R. Thompson, P.P. Acarnley, C. French, "Rotor position estimation in a switched reluctance drive using recursive least squares," Trans. on Industrial Electronics, vol. 47, no. 2, pp. 368-379, Apr. 2000. Full Text Link
Abstract : This paper describes a new algorithm for the estimation of rotor position in a switched reluctance motor. It is based on a recursive least-squares estimator deducing both position and speed. A particular advantage of the algorithm is its ability to extract information about rotor position at very low speeds (one electrical cycle per minute) from voltage and current waveforms sampled only at the converter switching frequency. Experimental results for a 12/8 motor demonstrate that estimation is possible over the full range of operating conditions, including the field-weakening region, with a typical accuracy of better than two mechanical degrees. The paper also illustrates the performance of the algorithm by showing it operating within a sensorless position controller
16. B. Robyns, F. Berthereau, J.-P. Hautier, H. Buyse, "A fuzzy-logic-based multimodel field orientation in an indirect FOC of an induction motor," Trans. on Industrial Electronics, vol. 47, no. 2, pp. 380-388, Apr. 2000. Full Text Link
Abstract : Classical indirect field-oriented control is highly sensitive to uncertainties in the rotor resistance of the induction motor. This sensitivity can be reduced by combining two different methods to compute the stator electrical frequency. Fuzzy logic is used to combine both methods to obtain a compromise which reduces the flux control sensitivity to electrical parameter errors at each operating point. The design of the fuzzy logic block is based on a theoretical sensitivity analysis taking magnetic saturation into account, in simulations and in experiments. In this paper, the performance of the proposed control algorithm is theoretically and experimentally studied. The theoretical predictions are validated by experiments, by considering the stator current variations, to develop a given steady-state torque, induced by the imperfect flux control
Robotics and Vision
17. N. Kasa, H. Watanabe, "A mechanical sensorless control system for salient-pole brushless DC motor with autocalibration of estimated position angles," Trans. on Industrial Electronics, vol. 47, no. 2, pp. 389-395, Apr. 2000. Full Text Link
Abstract : In this paper, a mechanical sensorless control system is reported for salient-pole brushless DC motor drives. Here, two new methods are proposed for obtaining the position angle, the accuracy of which affects the operation of the switching devices of the inverter that drives the motor. First, the method for estimating the position angle is proposed. Secondly, the correcting method for reducing the errors involved in the estimation of position angle is given. The experimental results show that the estimated position angles are calibrated automatically, and then the proposed sensorless control system can control the speed and the position angles of the motor precisely
18. M. Kaufhold, H. Aninger, M. Berth, J. Speck, M. Eberhardt, "Electrical stress and failure mechanism of the winding insulation in PWM-inverter-fed low-voltage induction motors," Trans. on Industrial Electronics, vol. 47, no. 2, pp. 396-402, Apr. 2000. Full Text Link
Abstract : The winding insulation of low-voltage induction motors in adjustable-speed drive systems with voltage-fed inverters is substantially more stressed than in line-powered motors. Consequently, this operation is subject to limitations depending on the electrical stress and on the failure behavior of the winding insulation. Actual recommendations do not consider sufficiently the physics behind these phenomena and contain large utilizable reserves
19. Seul Jung, T.C. Hsia, "Robust neural force control scheme under uncertainties in robot dynamics and unknown environment," Trans. on Industrial Electronics, vol. 47, no. 2, pp. 403-412, Apr. 2000. Full Text Link
Abstract : The original impedance function is known to lack robustness due to unknown robot dynamic model and the environment. In order to improve that result, a new impedance function is derived which specifies a desired force directly. This results in a new robust robot force tracking impedance control scheme, which employs a neural network as a compensator to cancel out all uncertainties. The proposed neural force control scheme is capable of making the robot track a specified desired force as well as of compensating for uncertainties in environment location and stiffness, and in robot dynamics. Separate training signals for free-space motion and contact-space motion control are developed to train the neural compensator online. The design of the training signals is justified. Simulation studies with a three-link rotary robot manipulator are carried out and the results show excellent force tracking performance
Signal Processing
20. S. Komada, N. Machii, T. Hori, "Control of redundant manipulators considering order of disturbance observer," Trans. on Industrial Electronics, vol. 47, no. 2, pp. 413-420, Apr. 2000. Full Text Link
Abstract : A manipulator control method using a disturbance observer with no inverse dynamics has been proposed. The order of the disturbance observer affects the performance of control system, because nominalization of plant is dependent on the control object and the order of the disturbance observer. This paper proposes a unique choice of disturbance observers of different order in joint and task space to improve system performance of hybrid position/force control of redundant manipulators. Also, it has been shown that a proper selection of a coefficient of the disturbance observer is capable to improve robust stability, while not influencing basic performance. The proposed strategy can realize acceleration control and second derivative of force control in the task space, which realizes robust and precise control of manipulators. Experimental results using a redundant manipulator show the effectiveness of the proposed strategy
21. Shiuh-Jer Huang, Ji-Shin Lee, "A stable self-organizing fuzzy controller for robotic motion control," Trans. on Industrial Electronics, vol. 47, no. 2, pp. 421-428, Apr. 2000. Full Text Link
Abstract : It is well known that robotic manipulators are highly nonlinear coupling dynamic systems. It is difficult to establish an appropriate mathematical model for the design of a model-based controller. Although fuzzy logic control has a model-free feature, it still needs time-consuming work for the rules bank and fuzzy parameters adjustment. In this paper, a stable self-organizing fuzzy controller (SOFC) is proposed to manipulate the motion trajectory of a 5-degrees-of-freedom robot. This approach has a learning ability for responding to the time-varying characteristic of a robot. Its control rules bank can be established and modified continuously by online learning with zero initial fuzzy rules. In addition, this control strategy has effectively improved the stability problem of a previous SOFC. The experimental results show that this intelligent controller has a stable learning ability and good motion control capability
22. Xinkai Chen, S. Komada, T. Fukuda, "Design of a nonlinear disturbance observer," Trans. on Industrial Electronics, vol. 47, no. 2, pp. 429-437, Apr. 2000. Full Text Link
Abstract : This paper presents a new disturbance observer based on the variable structure system theory for minimum-phase (with respect to the relationship between the disturbance and output) dynamical systems with arbitrary relative degrees. The model uncertainties and the nonlinear parts of the system are merged into the disturbance term and are regarded as a part of the disturbances. The upper and lower bounds of the disturbance are assumed to be known as a priori information. Simulation results are presented to show the robustness and effectiveness of the new disturbance observer. Experimental results show the practicality of the new observer
Emerging Technologies
23. D. Cole, S. Sridharan, M. Moody, "Frequency offset correction for HF radio speech reception," Trans. on Industrial Electronics, vol. 47, no. 2, pp. 438-443, Apr. 2000. Full Text Link
Abstract : High-frequency single-sideband (HF-SSB) radio communication suffers from highly variable propagation conditions and high levels of interference noise. One common distortion is frequency shifting of the received signal due to differences in carrier frequencies at transmitter and receiver, or to Doppler shifts due to the transmission path. This paper presents a novel and efficient technique to compensate for this frequency offset using only the received speech signal to determine and correct the frequency error. Good improvement in received speech quality is achieved, using a mean opinion score measurement
24. Kuo-Kai Shyu, Cheng-Yuan Chang, "Modified FIR filter with phase compensation technique to feedforward active noise controller design," Trans. on Industrial Electronics, vol. 47, no. 2, pp. 444-453, Apr. 2000. Full Text Link
Abstract : In this paper, a finite-impulse response (FIR) filter with phase compensation is proposed to design the digital controller for active noise cancellation in ducts. This method can overcome the influence of delay effects, which arise from the analog devices, and then help to improve the ability of noise reduction. Moreover, all the control algorithms are implemented in a fixed-point-type digital signal processor that produces an antinoise signal to cancel noise in the authors' experiments. Experiments are demonstrated in a polyvinyl chloride material circular duct. It is proved that, by using the FIR filter with phase compensation, the reduction of broadband noise is about 20 dB, and about 50 dB of narrowband noise. The system also provides the ability to cancel the noise with two harmonic components, like automobile noise
25. W.L. Xu, S.K. Tso, Y. Tso, "Reuse of existing design information in the development of new electronic PTC devices via a neural network approach," Trans. on Industrial Electronics, vol. 47, no. 2, pp. 454-469, Apr. 2000. Full Text Link
Abstract : Burning events and voltage endurance are two important aspects that need to be predicted during the design and development stage of a new series of electronic positive temperature coefficient (PTC) devices. In this paper, these problems are identified by experiments conducted on well-developed devices, and are resolved by improving the resistance-temperature characteristics of the PTC devices in order to overdamp, underdamp, or critically damp high-current/high-voltage surges. The use of neural networks is proposed, to learn the empirical or experimental design information that already exists, and then to predict the occurrence of burning events and the voltage endurance of new PTC devices at the design/development stage. Two predictive schemes are presented separately, for burning events and for voltage endurance, where the training patterns for the desired outputs are either generated from empirical formulae or collected from experiments on already-developed PTC devices. The predicted results are discussed against the experimental results that are available, and an overall concept is finally given for the integration of the neural predictive models into the computer-aided design/computer-aided engineering system used for the PTC devices
26. M.H.R. Fazlur Rahman, R. Devanathan, Zhu Kuanyi, "Neural network approach for linearizing control of nonlinear process plants," Trans. on Industrial Electronics, vol. 47, no. 2, pp. 470-477, Apr. 2000. Full Text Link
Abstract : The application of a feedback linearization technique using artificial neural networks (ANNs) for a nonlinear industrial process plant is considered in this paper. The process plant is modeled first using an ANN, and then the dynamic neural network model acting as a process plant emulator is feedback linearized. A novel configuration for linearization of an ANN emulator using only backpropagation is used. Effective control of the linearized emulator is then exhibited using a linear controller. Experimentation and simulation results on the linearized emulator are presented to demonstrate the effectiveness of the feedback linearization technique
27. T.W.S. Chow, Xiao-Dong Li, Yong Fang, "A real-time learning control approach for nonlinear continuous-time system using recurrent neural networks," Trans. on Industrial Electronics, vol. 47, no. 2, pp. 478-486, Apr. 2000. Full Text Link
Abstract : In this paper, a real-time iterative learning control (ILC) approach for a nonlinear continuous-time system using recurrent neural networks (RNNs) with time-varying weights is presented. Two RNNs are utilized in the ILC system. One is used to approximate the nonlinear system and another is used to mimic the desired system response. The ILC rule is obtained by combining the two RNNs to form a neural network control system. Also, a kind of iterative RNNs training algorithm is developed based on the two-dimensional (2-D) system theory. An RNN using the proposed 2-D training algorithm is able to approximate any trajectory to a very high degree of accuracy. Simulation results show that the proposed ILC approach is very efficient. The newly developed 2-D RNNs training algorithms provides a new dimension to the application of RNNs in a nonlinear continuous-time system
28. M. Onder Efe, O. Kaynak, B.M. Wilamowski, "Stable training of computationally intelligent systems by using variable structure systems technique," Trans. on Industrial Electronics, vol. 47, no. 2, pp. 487-496, Apr. 2000. Full Text Link
Abstract : This paper presents a novel training algorithm for computationally intelligent architectures, whose outputs are differentiable with respect to the adjustable design parameters. The algorithm combines the gradient descent technique with the variable-structure-systems approach. The combination is performed by expressing the conventional weight update rule in continuous time and application of sliding-mode control method to the gradient-based training procedure. The proposed combination therefore exhibits a degree of robustness with respect to the unmodeled multivariable internal dynamics of gradient descent and to the environmental disturbances. With conventional training procedures, the excitation of this dynamics during a training cycle can lead to instability, which may be difficult to alleviate due to the multidimensionality of the solution space and the ambiguities on the free design parameters, such as learning rate or momentum coefficient. This paper develops a heuristic that a computationally intelligent system, which may be a neural network architecture or a fuzzy inference mechanism, can be trained such that the adjustable parameter values are forced to settle down (parameter stabilization) while minimizing an appropriate cost function (cost optimization). The proposed approach is applied to the control of a robotic arm in two different ways. In one, a standard fuzzy system architecture is used, whereas in the second, the arm is controlled by the use of a multilayer perceptron. In order to demonstrate the robustness of the approach presented, a considerable amount of observation noise and varying payload conditions are also studied
Letters to the Editor
29. P. Pejovic, Z. Janda, "An improved current injection network for three-phase high-power-factor rectifiers that apply the third harmonic current injection," Trans. on Industrial Electronics, vol. 47, no. 2, pp. 497-499, Apr. 2000. Full Text Link
Abstract : A novel current injection network for low-harmonic rectifiers that apply the third harmonic current injection is proposed in this paper. The current injection network requires one inductor, two capacitors, and one 1:1 transformer with a voltampere rating of only 0.16% of the input power. The transformer is introduced to provide complete rejection of harmonic components of the injected currents at even triples of the line frequency, resulting in significant reduction of the input current total harmonic distortion (THD). Dependence of the input current THD on the current injection network Q factor is computed. The THD is shown to be in the range 4%<THD<5.125%. Analytically obtained results are experimentally verified on a 1.5 kW rectifier