The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
R Belmans - One of the best experts on this subject based on the ideXlab platform.
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model based generation of low distortion currents in grid coupled pwm inverters using an lcl output filter
IEEE Transactions on Power Electronics, 2006Co-Authors: B Bolsens, K De Brabandere, J Van Den Keybus, Johan Driesen, R BelmansAbstract:In this paper, a single phase inductance–capacitance– inductance (LCL) output stage for grid coupled inverters is designed and built. An accurate model and observer of the output filter and the distorted grid voltage are implemented. The paper deals with the construction of a 14-state model, and the Feedback Control Loop to obtain adequate closed Loop response. Simulations indicate a good performance of the Controller, with a total harmonic current distortion (THD) below 1%. Experimental results confirm simulations, and illustrate the correct operation of the Kalman observer to estimate the distorted grid voltage (THD 3%). The observer only uses the inverter current measurement as input. The output filter effectively reduces the pulsewidth modulation harmonics in the grid current.
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model based generation of low distortion currents in grid coupled pwm inverters using an lcl output filter
Power Electronics Specialists Conference, 2004Co-Authors: B Bolsens, K De Brabandere, J Van Den Keybus, Johan Driesen, R BelmansAbstract:In this work, a single phase LCL output stage for grid coupled applications is built and evaluated. An accurate model and observer of the output filter and the distorted grid voltage is implemented. This paper deals with the construction of a 14-state model, and the Feedback Control Loop to obtain good closed Loop response. Simulations indicate a good performance of the Controller, with a total harmonic current distortion (THD) below 1%. Experimental results confirm the simulations, and illustrate the good operation of the Kalman observer to estimate the distorted grid voltage (THD 3%). The output filter effectively reduces the PWM harmonics in the grid current.
B Bolsens - One of the best experts on this subject based on the ideXlab platform.
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model based generation of low distortion currents in grid coupled pwm inverters using an lcl output filter
IEEE Transactions on Power Electronics, 2006Co-Authors: B Bolsens, K De Brabandere, J Van Den Keybus, Johan Driesen, R BelmansAbstract:In this paper, a single phase inductance–capacitance– inductance (LCL) output stage for grid coupled inverters is designed and built. An accurate model and observer of the output filter and the distorted grid voltage are implemented. The paper deals with the construction of a 14-state model, and the Feedback Control Loop to obtain adequate closed Loop response. Simulations indicate a good performance of the Controller, with a total harmonic current distortion (THD) below 1%. Experimental results confirm simulations, and illustrate the correct operation of the Kalman observer to estimate the distorted grid voltage (THD 3%). The observer only uses the inverter current measurement as input. The output filter effectively reduces the pulsewidth modulation harmonics in the grid current.
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model based generation of low distortion currents in grid coupled pwm inverters using an lcl output filter
Power Electronics Specialists Conference, 2004Co-Authors: B Bolsens, K De Brabandere, J Van Den Keybus, Johan Driesen, R BelmansAbstract:In this work, a single phase LCL output stage for grid coupled applications is built and evaluated. An accurate model and observer of the output filter and the distorted grid voltage is implemented. This paper deals with the construction of a 14-state model, and the Feedback Control Loop to obtain good closed Loop response. Simulations indicate a good performance of the Controller, with a total harmonic current distortion (THD) below 1%. Experimental results confirm the simulations, and illustrate the good operation of the Kalman observer to estimate the distorted grid voltage (THD 3%). The output filter effectively reduces the PWM harmonics in the grid current.
Bostjan Batagelj - One of the best experts on this subject based on the ideXlab platform.
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improving the side mode suppression ratio and reducing the frequency drift in an opto electronic oscillator with a Feedback Control Loop and additional phase modulation
Journal of Lightwave Technology, 2016Co-Authors: Luka Bogataj, Matjaz Vidmar, Bostjan BatageljAbstract:We present two stabilization methods for an opto-electronic oscillator. By using a frequency discriminator with a Feedback Control Loop the long-term stabilization was improved, and a frequency drift of 0.05 ppm/K was achieved without any fiber thermal stabilization. In addition, the phase-noise degradation as a result of the discriminator Control Loop was investigated. To the best of our knowledge, this has not been done before for this type of method. Our study revealed that a properly designed Control Loop does not increase the phase noise. The second stabilization method was used to increase the side-mode suppression ratio. This was achieved with an additional Control Loop in the form of an oscillator-Loop phase modulation. In this way, a 5-dB increase in the side-mode suppression ratio was recorded. The phase-noise degradation was less than 1 dB in the close-in region. The two methods were designed to operate simultaneously. This design provides both simplicity and cost effectiveness for the stabilized opto-electronic oscillator.
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A Feedback Control Loop for Frequency Stabilization in an Opto-Electronic Oscillator
Journal of Lightwave Technology, 2014Co-Authors: Luka Bogataj, Matjaz Vidmar, Bostjan BatageljAbstract:A new method for the long-term frequency stabilization of an opto-electronic oscillator (OEO) is proposed. All existing methods are based on the precise temperature stabilization of specific components of an OEO, for example, the optical fiber and the microwave band-pass filter. We propose a new method based on a Feedback Control Loop that detects the oscillator frequency using a frequency discriminator and modifies the laser wavelength to keep the oscillator frequency constant using the fiber chromatic dispersion. With the proposed method we achieved a frequency-temperature coefficient of 0.2 ppm/K. Unlike previous methods, our method also compensates the effects of other unstabilized OEO components on the OEO's frequency. Other benefits are that there is no need for an accurate temperature stabilization of the optical fiber and mode hopping is prevented.
V Vorperian - One of the best experts on this subject based on the ideXlab platform.
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synthesis of medium voltage dc to dc converters from low voltage high frequency pwm switching converters
IEEE Transactions on Power Electronics, 2007Co-Authors: V VorperianAbstract:Low-voltage dc-to-dc power conversion is a very mature industry which uses high-frequency pulsewidth modulation (PWM) switching techniques. The passive and active components needed to build low-voltage dc-to-dc converters are highly available, affordable and constantly improving. In this paper, a very simple and systematic method of using a large number of low-voltage, high-frequency PWM converters to synthesize highly redundant, medium voltage (4-40 kV) dc-to-dc converters is presented. Theoretical and practical considerations are discussed in necessary detail and test results of an actual 10-kW, 10 kV-to-400 V, converter built from 48 low-voltage forward converters are presented. Real-time and average reduced circuit models are derived to predict the dynamical behavior of the converter and to design the Feedback Control Loop.
Alexis J De Abreugarcia - One of the best experts on this subject based on the ideXlab platform.
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a novel Control for a cascaded buck boost pfc converter operating in discontinuous capacitor voltage mode
IEEE Transactions on Industrial Electronics, 2016Co-Authors: Mohamed O Badawy, Yilmaz Sozer, Alexis J De AbreugarciaAbstract:This paper presents a new dual-switch Control structure for an ac/dc noninverting cascaded buck–boost power factor correction converter. The proposed converter operates at a discontinuous capacitor voltage mode providing an inherent high-power factor and a zero voltage turn-off switching. Additionally, the proposed Control structure enables for a nondistorted sinusoidal current for a wide range of output voltage levels. Unlike the conventional methods, a mode detector is not required and consequently there is no hard transition between buck and boost modes. Although both converter switches are Controlled, only one Feedback Control Loop is required to obtain the desired power flow at a unity power factor. The principle of operation, theoretical analysis, simulation, and experimental results of a 1.6-kW prototype grid-connected converter are presented. The results confirmed the validity of the proposed system under various operating conditions.
