The Experts below are selected from a list of 297 Experts worldwide ranked by ideXlab platform

Frede Blaabjerg - One of the best experts on this subject based on the ideXlab platform.

  • A-Source Impedance network
    2016 IEEE Energy Conversion Congress and Exposition (ECCE), 2016
    Co-Authors: Yam P. Siwakoti, Frede Blaabjerg, Veda P. Galigekere, Marian K. Kazimierczuk
    Abstract:

    A novel A-Source Impedance network is proposed in this paper using an autotransformer for realizing converters that demand a very high dc voltage gain. The network utilizes a minimal turns ratio compared to other Magnetically Coupled Impedance Source (MCIS) networks to attain high voltage gain. In addition, the proposed converter draws a continuous current from the Source, and hence it is suitable for many types of renewable energy Sources. This voltage boost capability has been demonstrated by mathematical derivations, and it is also realized in experiments with an example single-switch 50 kHz, 200 W dc-dc converter.

  • Quadratic boost A-Source Impedance network
    2016 IEEE Energy Conversion Congress and Exposition (ECCE), 2016
    Co-Authors: Yam P. Siwakoti, Frede Blaabjerg, Andrii Chub, Dmitri Vinnikov
    Abstract:

    A novel quadratic boost A-Source Impedance network is proposed to realize converters that demand very high voltage gain. To satisfy the requirement, the network uses an autotransformer where the obtained gain is quadratically dependent on the duty ratio and is unmatched by any existing Impedance Source networks and normal dc-dc converters with coupled magnetics at the same duty ratio and turns ratio. The term “Quadratic Boost A-Source” indicates its quadratic varying gain in the operating principle of the converter. The proposed converter draws a continuous current from the Source and suits for many types of renewable Sources. This capability has been demonstrated by mathematical derivation and proven in experiments with a single-switch 200 W, 40 kHz dc-dc converter.

  • A-Source Impedance Network
    IEEE Transactions on Power Electronics, 2014
    Co-Authors: Yam P. Siwakoti, Frede Blaabjerg, Veda P. Galigekere, Agasthya Ayachit, Marian K. Kazimierczuk
    Abstract:

    A novel A-Source Impedance network is proposed in this letter. The A-Source Impedance network uses an autotransformer for realizing converters for any application that demand a very high dc voltage gain. The network utilizes a minimal turns ratio compared to other magnetically coupled Impedance Source networks to attain a high voltage gain. In addition, the proposed converter draws a continuous current from the Source, and hence it is suitable for many types of renewable energy Sources. The derived network expressions and theoretical analysis are finally validated experimentally with an example single-switch 400-W dc–dc converter. For the closed-loop control design and stability assessment, a small signal model and its analysis of the proposed network are also presented in brief.

  • Y-Source Impedance network
    2014 IEEE Applied Power Electronics Conference and Exposition - APEC 2014, 2014
    Co-Authors: Yam P. Siwakoti, Poh Chiang Loh, Frede Blaabjerg, Graham Town
    Abstract:

    This paper introduces a Y-shaped Impedance network for realizing converters that demand a high voltage gain while using a small duty ratio. To achieve that, the proposed network uses a tightly coupled transformer with three windings, whose obtained gain is presently not matched by existing networks operated at the same duty ratio. This capability has been demonstrated by mathematical derivation for the proposed network in comparison with other recently reported networks. To further prove the network performance, a single-switch dc-dc converter has been implemented with the network, before testing it experimentally. The results obtained clearly verify the network performance in addition to its higher power density that can generally be achieved by coupled magnetics.

  • Hybrid-Source Impedance Networks: Layouts and Generalized Cascading Concepts
    IEEE Transactions on Power Electronics, 2011
    Co-Authors: Feng Gao, Poh Chiang Loh, Miao Zhu, Frede Blaabjerg
    Abstract:

    Hybrid-Source Impedance networks have attracted attention among researchers because of their flexibility in performing buck-boost energy conversion. To date, three distinct types of Impedance networks can be summarized for implementing voltage-type inverters with another three types summarized for current-type inverters. These Impedance networks can in principle be combined into two generic network entities, before multiple of them can further be connected together by applying any of the two proposed generalized cascading concepts. The resulting two-level and three-level inverters implemented using the cascaded networks would have a higher output voltage gain and other unique advantages that currently have not been investigated yet. It is anticipated that these advantages would help the formed inverters find applications in photovoltaic and other renewable systems, where a high voltage gain is usually requested. Experimental testing for validating the extra boosting has already been conducted with some representative results presented at the end of this paper.

Yam P. Siwakoti - One of the best experts on this subject based on the ideXlab platform.

  • Quadratic boost A-Source Impedance network
    2016 IEEE Energy Conversion Congress and Exposition (ECCE), 2016
    Co-Authors: Yam P. Siwakoti, Frede Blaabjerg, Andrii Chub, Dmitri Vinnikov
    Abstract:

    A novel quadratic boost A-Source Impedance network is proposed to realize converters that demand very high voltage gain. To satisfy the requirement, the network uses an autotransformer where the obtained gain is quadratically dependent on the duty ratio and is unmatched by any existing Impedance Source networks and normal dc-dc converters with coupled magnetics at the same duty ratio and turns ratio. The term “Quadratic Boost A-Source” indicates its quadratic varying gain in the operating principle of the converter. The proposed converter draws a continuous current from the Source and suits for many types of renewable Sources. This capability has been demonstrated by mathematical derivation and proven in experiments with a single-switch 200 W, 40 kHz dc-dc converter.

  • A-Source Impedance network
    2016 IEEE Energy Conversion Congress and Exposition (ECCE), 2016
    Co-Authors: Yam P. Siwakoti, Frede Blaabjerg, Veda P. Galigekere, Marian K. Kazimierczuk
    Abstract:

    A novel A-Source Impedance network is proposed in this paper using an autotransformer for realizing converters that demand a very high dc voltage gain. The network utilizes a minimal turns ratio compared to other Magnetically Coupled Impedance Source (MCIS) networks to attain high voltage gain. In addition, the proposed converter draws a continuous current from the Source, and hence it is suitable for many types of renewable energy Sources. This voltage boost capability has been demonstrated by mathematical derivations, and it is also realized in experiments with an example single-switch 50 kHz, 200 W dc-dc converter.

  • A-Source Impedance Network
    IEEE Transactions on Power Electronics, 2014
    Co-Authors: Yam P. Siwakoti, Frede Blaabjerg, Veda P. Galigekere, Agasthya Ayachit, Marian K. Kazimierczuk
    Abstract:

    A novel A-Source Impedance network is proposed in this letter. The A-Source Impedance network uses an autotransformer for realizing converters for any application that demand a very high dc voltage gain. The network utilizes a minimal turns ratio compared to other magnetically coupled Impedance Source networks to attain a high voltage gain. In addition, the proposed converter draws a continuous current from the Source, and hence it is suitable for many types of renewable energy Sources. The derived network expressions and theoretical analysis are finally validated experimentally with an example single-switch 400-W dc–dc converter. For the closed-loop control design and stability assessment, a small signal model and its analysis of the proposed network are also presented in brief.

  • Y-Source Impedance network
    2014 IEEE Applied Power Electronics Conference and Exposition - APEC 2014, 2014
    Co-Authors: Yam P. Siwakoti, Poh Chiang Loh, Frede Blaabjerg, Graham Town
    Abstract:

    This paper introduces a Y-shaped Impedance network for realizing converters that demand a high voltage gain while using a small duty ratio. To achieve that, the proposed network uses a tightly coupled transformer with three windings, whose obtained gain is presently not matched by existing networks operated at the same duty ratio. This capability has been demonstrated by mathematical derivation for the proposed network in comparison with other recently reported networks. To further prove the network performance, a single-switch dc-dc converter has been implemented with the network, before testing it experimentally. The results obtained clearly verify the network performance in addition to its higher power density that can generally be achieved by coupled magnetics.

Jheshuan Lin - One of the best experts on this subject based on the ideXlab platform.

  • one dimensional optimization for proportional resonant controller design against the change in Source Impedance and solar irradiation in pv systems
    IEEE Transactions on Industrial Electronics, 2014
    Co-Authors: Woeiluen Chen, Jheshuan Lin
    Abstract:

    The variation in Source Impedance and solar irradiation effects on photovoltaic (PV) system control performance is investigated. A proportional-resonant (PR) controller in a stationary frame in place of a proportional-integral controller in a synchronous frame was adopted to modulate a single-phase grid-tied inverter for PV systems. Although the PR controllers have gained some momentum lately due to advantages such as instantaneous tracking capability and low-cost computational reSources, the tracking performance may decline due to changes in Source Impedance and solar irradiation where the conventional PR design rule is void. To adapt PR controllers over diverse operating conditions without incurring excessive tracking error, a one-dimensional optimization (ODO) algorithm that dictates the quality of the tracking performance is proposed to search for an appropriate factor χ between the real part of dominant and nondominant eigenvalues for the PV systems. The control gains of the PR controller can be then altered in light of the optimal χ through a simple algebraic conversion. The experimental results confirm the performance of the proposed strategy.

  • One-Dimensional Optimization for Proportional–Resonant Controller Design Against the Change in Source Impedance and Solar Irradiation in PV Systems
    IEEE Transactions on Industrial Electronics, 2014
    Co-Authors: Woeiluen Chen, Jheshuan Lin
    Abstract:

    The variation in Source Impedance and solar irradiation effects on photovoltaic (PV) system control performance is investigated. A proportional-resonant (PR) controller in a stationary frame in place of a proportional-integral controller in a synchronous frame was adopted to modulate a single-phase grid-tied inverter for PV systems. Although the PR controllers have gained some momentum lately due to advantages such as instantaneous tracking capability and low-cost computational reSources, the tracking performance may decline due to changes in Source Impedance and solar irradiation where the conventional PR design rule is void. To adapt PR controllers over diverse operating conditions without incurring excessive tracking error, a one-dimensional optimization (ODO) algorithm that dictates the quality of the tracking performance is proposed to search for an appropriate factor χ between the real part of dominant and nondominant eigenvalues for the PV systems. The control gains of the PR controller can be then altered in light of the optimal χ through a simple algebraic conversion. The experimental results confirm the performance of the proposed strategy.

Marian K. Kazimierczuk - One of the best experts on this subject based on the ideXlab platform.

  • A-Source Impedance network
    2016 IEEE Energy Conversion Congress and Exposition (ECCE), 2016
    Co-Authors: Yam P. Siwakoti, Frede Blaabjerg, Veda P. Galigekere, Marian K. Kazimierczuk
    Abstract:

    A novel A-Source Impedance network is proposed in this paper using an autotransformer for realizing converters that demand a very high dc voltage gain. The network utilizes a minimal turns ratio compared to other Magnetically Coupled Impedance Source (MCIS) networks to attain high voltage gain. In addition, the proposed converter draws a continuous current from the Source, and hence it is suitable for many types of renewable energy Sources. This voltage boost capability has been demonstrated by mathematical derivations, and it is also realized in experiments with an example single-switch 50 kHz, 200 W dc-dc converter.

  • A-Source Impedance Network
    IEEE Transactions on Power Electronics, 2014
    Co-Authors: Yam P. Siwakoti, Frede Blaabjerg, Veda P. Galigekere, Agasthya Ayachit, Marian K. Kazimierczuk
    Abstract:

    A novel A-Source Impedance network is proposed in this letter. The A-Source Impedance network uses an autotransformer for realizing converters for any application that demand a very high dc voltage gain. The network utilizes a minimal turns ratio compared to other magnetically coupled Impedance Source networks to attain a high voltage gain. In addition, the proposed converter draws a continuous current from the Source, and hence it is suitable for many types of renewable energy Sources. The derived network expressions and theoretical analysis are finally validated experimentally with an example single-switch 400-W dc–dc converter. For the closed-loop control design and stability assessment, a small signal model and its analysis of the proposed network are also presented in brief.

Zhenzhen Peng - One of the best experts on this subject based on the ideXlab platform.

  • a noise Source Impedance extraction method for operating smps using modified lisn and simplified calibration procedure
    IEEE Transactions on Power Electronics, 2017
    Co-Authors: Xiaofan Shang, Zhenzhen Peng
    Abstract:

    A noise Source Impedance extraction method for switched-mode power supply (SMPS) under operating condition is proposed and validated in this letter. First, a simplified precalibration method using several known Impedances is introduced to eliminate the influence of measurement instruments and other parasitic effects. Second, the configuration of the proposed method is presented and the calculation methods of common-mode and differential-mode noise Source Impedances using microwave transmission analysis are described, respectively. The experimental results show that the proposed method can extract the noise Source Impedance of SMPS in wide frequency band with sufficient accuracy. Compared with traditional methods, the complex calibration process can be simplified, and no more additional equipment is required. Moreover, a novel multiple-function line Impedance stabilization network (MF-LISN) with the function of electromagnetic interference measurement and noise Source Impedance extraction is designed according to the proposed method. Since only MF-LISN is used, it can be more convenient to extract the noise Source Impedance of SMPS for electromagnetic compatibility pretest.