The Experts below are selected from a list of 105 Experts worldwide ranked by ideXlab platform

Hunglu Wang - One of the best experts on this subject based on the ideXlab platform.

  • a new method of passive harmonic filter planning for Controlling Voltage distortion in a power system
    IEEE Transactions on Power Delivery, 2006
    Co-Authors: G W Chang, So-yung Chu, Hunglu Wang
    Abstract:

    This paper presents a new method for planning single-tuned passive harmonic filters to control harmonic Voltage and Voltage distortion throughout a power system. Several alternative objective functions are considered as performance indices in the filter planning problem while the IEEE-519 individual and total harmonic Voltage distortion limits at each network bus, as well as filter component limits, are modeled as constraints. The tuned frequency deviation of the filter caused by component manufacturing errors and environmental changes is also taken into account. To solve the problem, a two-step procedure is first proposed to place the filters. Next, the planning problem is formulated as a constrained optimization problem for minimizing the defined network objective function and is then solved by a genetic algorithm-based optimizer to obtain the optimal size of each filter component. The usefulness of the proposed method is tested with an actual distribution network. Results show that the method is effective, computationally robust, and is suitable for the passive filter planning in a power system.

  • a new method of passive harmonic filter planning for Controlling Voltage distortion in a power system
    IEEE Power Engineering Society General Meeting 2005, 2005
    Co-Authors: G W Chang, Hunglu Wang
    Abstract:

    Summary form only given. This paper presents a new method for planning single-tuned passive harmonic filters to control harmonic Voltage and Voltage distortion throughout a power system. Several alternative objective functions are considered as performance indices in the filter planning problem while the IEEE-519 individual and total harmonic Voltage distortion limits at each network bus, as well as filter component limits are modeled as constraints. The tuned frequency deviation of the filter caused by component manufacturing errors and environmental changes is also taken into account. To solve the problem, a two-step procedure is firstly proposed to place the filters. Next, the planning problem is formulated as a constrained optimization problem for minimizing the defined network objective function and is then solved by a genetic algorithm-based optimizer to obtain the optimal size of each filter component. The usefulness of the proposed method is tested with an actual distribution network. Results show that the method is effective, computationally robust, and is suitable for the passive filter planning in a power system.

  • strategic placement and sizing of passive filters in a power system for Controlling Voltage distortion
    IEEE Transactions on Power Delivery, 2004
    Co-Authors: G W Chang, Hunglu Wang, So-yung Chu
    Abstract:

    This paper presents an approach for determining optimal or near-optimal locations and sizes of single-tuned passive harmonic filters among existent capacitor busses in a power system. The objective of the harmonic filter planning is to control the system-wide Voltage distortion, while individual/total harmonic Voltage distortion limits at each network bus, and the filter component limits are considered as constraints. The tuned frequency deviation of the filter caused by component manufacturing errors and environment is also taken into account in the problem. The proposed two-phase planning procedure is first to formulate an unconstrained optimization problem for placement of the filters based on sensitivity analysis. Next, a constrained problem is formulated and is solved by a genetic algorithm-based optimizer. The proposed method is tested with an actual distribution system. Test results show that the method is effective, computationally robust, and suitable for passive filter planning in a power system.

So-yung Chu - One of the best experts on this subject based on the ideXlab platform.

  • a new method of passive harmonic filter planning for Controlling Voltage distortion in a power system
    IEEE Transactions on Power Delivery, 2006
    Co-Authors: G W Chang, So-yung Chu, Hunglu Wang
    Abstract:

    This paper presents a new method for planning single-tuned passive harmonic filters to control harmonic Voltage and Voltage distortion throughout a power system. Several alternative objective functions are considered as performance indices in the filter planning problem while the IEEE-519 individual and total harmonic Voltage distortion limits at each network bus, as well as filter component limits, are modeled as constraints. The tuned frequency deviation of the filter caused by component manufacturing errors and environmental changes is also taken into account. To solve the problem, a two-step procedure is first proposed to place the filters. Next, the planning problem is formulated as a constrained optimization problem for minimizing the defined network objective function and is then solved by a genetic algorithm-based optimizer to obtain the optimal size of each filter component. The usefulness of the proposed method is tested with an actual distribution network. Results show that the method is effective, computationally robust, and is suitable for the passive filter planning in a power system.

  • strategic placement and sizing of passive filters in a power system for Controlling Voltage distortion
    IEEE Transactions on Power Delivery, 2004
    Co-Authors: G W Chang, Hunglu Wang, So-yung Chu
    Abstract:

    This paper presents an approach for determining optimal or near-optimal locations and sizes of single-tuned passive harmonic filters among existent capacitor busses in a power system. The objective of the harmonic filter planning is to control the system-wide Voltage distortion, while individual/total harmonic Voltage distortion limits at each network bus, and the filter component limits are considered as constraints. The tuned frequency deviation of the filter caused by component manufacturing errors and environment is also taken into account in the problem. The proposed two-phase planning procedure is first to formulate an unconstrained optimization problem for placement of the filters based on sensitivity analysis. Next, a constrained problem is formulated and is solved by a genetic algorithm-based optimizer. The proposed method is tested with an actual distribution system. Test results show that the method is effective, computationally robust, and suitable for passive filter planning in a power system.

  • Strategic placement and sizing of passive filters in a power system for Controlling Voltage distortion
    IEEE Power Engineering Society General Meeting 2004., 2004
    Co-Authors: G. Chang, Hong-lu Wang, So-yung Chu
    Abstract:

    Summary form only given. This paper presents an approach for determining optimal or near-optimal locations and sizes of single-tuned passive harmonic filters among existent capacitor busses in a power system. The objective of the harmonic filter planning is to control the system-wide Voltage distortion, while individual/total harmonic Voltage distortion limits at each network bus, and the filter component limits are considered as constraints. The tuned frequency deviation of the filter caused by component manufacturing errors and environment is also taken into account in the problem. The proposed two-phase planning procedure is firstly to formulate an unconstrained optimization problem for placement of the filters based on sensitivity analysis. Next, a constrained problem is formulated and is solved by a genetic algorithm-based optimizer. The proposed method is tested with an actual distribution system. Test results show that the method is effective, computationally robust, and suitable for passive filter planning in a power system.

G W Chang - One of the best experts on this subject based on the ideXlab platform.

  • a new method of passive harmonic filter planning for Controlling Voltage distortion in a power system
    IEEE Transactions on Power Delivery, 2006
    Co-Authors: G W Chang, So-yung Chu, Hunglu Wang
    Abstract:

    This paper presents a new method for planning single-tuned passive harmonic filters to control harmonic Voltage and Voltage distortion throughout a power system. Several alternative objective functions are considered as performance indices in the filter planning problem while the IEEE-519 individual and total harmonic Voltage distortion limits at each network bus, as well as filter component limits, are modeled as constraints. The tuned frequency deviation of the filter caused by component manufacturing errors and environmental changes is also taken into account. To solve the problem, a two-step procedure is first proposed to place the filters. Next, the planning problem is formulated as a constrained optimization problem for minimizing the defined network objective function and is then solved by a genetic algorithm-based optimizer to obtain the optimal size of each filter component. The usefulness of the proposed method is tested with an actual distribution network. Results show that the method is effective, computationally robust, and is suitable for the passive filter planning in a power system.

  • a new method of passive harmonic filter planning for Controlling Voltage distortion in a power system
    IEEE Power Engineering Society General Meeting 2005, 2005
    Co-Authors: G W Chang, Hunglu Wang
    Abstract:

    Summary form only given. This paper presents a new method for planning single-tuned passive harmonic filters to control harmonic Voltage and Voltage distortion throughout a power system. Several alternative objective functions are considered as performance indices in the filter planning problem while the IEEE-519 individual and total harmonic Voltage distortion limits at each network bus, as well as filter component limits are modeled as constraints. The tuned frequency deviation of the filter caused by component manufacturing errors and environmental changes is also taken into account. To solve the problem, a two-step procedure is firstly proposed to place the filters. Next, the planning problem is formulated as a constrained optimization problem for minimizing the defined network objective function and is then solved by a genetic algorithm-based optimizer to obtain the optimal size of each filter component. The usefulness of the proposed method is tested with an actual distribution network. Results show that the method is effective, computationally robust, and is suitable for the passive filter planning in a power system.

  • strategic placement and sizing of passive filters in a power system for Controlling Voltage distortion
    IEEE Transactions on Power Delivery, 2004
    Co-Authors: G W Chang, Hunglu Wang, So-yung Chu
    Abstract:

    This paper presents an approach for determining optimal or near-optimal locations and sizes of single-tuned passive harmonic filters among existent capacitor busses in a power system. The objective of the harmonic filter planning is to control the system-wide Voltage distortion, while individual/total harmonic Voltage distortion limits at each network bus, and the filter component limits are considered as constraints. The tuned frequency deviation of the filter caused by component manufacturing errors and environment is also taken into account in the problem. The proposed two-phase planning procedure is first to formulate an unconstrained optimization problem for placement of the filters based on sensitivity analysis. Next, a constrained problem is formulated and is solved by a genetic algorithm-based optimizer. The proposed method is tested with an actual distribution system. Test results show that the method is effective, computationally robust, and suitable for passive filter planning in a power system.

Markus N. Preising - One of the best experts on this subject based on the ideXlab platform.

  • bestrophin 1 phenotypes and functional aspects in bestrophinopathies
    Ophthalmic Genetics, 2015
    Co-Authors: Caroline Pasquay, Lu Fei Wang, Birgit Lorenz, Markus N. Preising
    Abstract:

    This is to review the current state of knowledge on the functional and clinical aspects of bestrophin 1, a prominent member of a family of proteins involved in the control and properties of the light peak of the EOG. Initially human bestrophin 1 gene (BEST1) mutations were identified to underlie Best vitelliform macular dystrophy (VMD), a dominantly inherited, juvenile-onset form of macular degeneration. In the recent past the phenotypical spectrum of retinal disorders associated with BEST1 mutations has been extended and the term bestrophinopathies was coined. The physiological role of bestrophin 1 is still not completely understood but has been linked to the generation of a transepithelial chloride current by Controlling Voltage-dependent calcium channels (VDCC). Dysfunction of bestrophin 1 may result in abnormal ion and fluid transport by the retinal pigment epithelium (RPE) disturbing and even disrupting direct interactions between the RPE and the photoreceptors.

  • Bestrophin 1 – Phenotypes and Functional Aspects in Bestrophinopathies
    Ophthalmic Genetics, 2013
    Co-Authors: Caroline Pasquay, Lu Fei Wang, Birgit Lorenz, Markus N. Preising
    Abstract:

    This is to review the current state of knowledge on the functional and clinical aspects of bestrophin 1, a prominent member of a family of proteins involved in the control and properties of the light peak of the EOG. Initially human bestrophin 1 gene (BEST1) mutations were identified to underlie Best vitelliform macular dystrophy (VMD), a dominantly inherited, juvenile-onset form of macular degeneration. In the recent past the phenotypical spectrum of retinal disorders associated with BEST1 mutations has been extended and the term bestrophinopathies was coined. The physiological role of bestrophin 1 is still not completely understood but has been linked to the generation of a transepithelial chloride current by Controlling Voltage-dependent calcium channels (VDCC). Dysfunction of bestrophin 1 may result in abnormal ion and fluid transport by the retinal pigment epithelium (RPE) disturbing and even disrupting direct interactions between the RPE and the photoreceptors.

Sadao Funahashi - One of the best experts on this subject based on the ideXlab platform.

  • Voltage fluctuation compensator for shinkansen
    Electrical Engineering in Japan, 2008
    Co-Authors: Tetsuo Uzuka, Shouji Ikedo, Keiji Ueda, Yoshifumi Mochinaga, Sadao Funahashi
    Abstract:

    In AC electric railways, three-phase Voltage is changed into the single-phase circuit of two circuits with the Scott-connected transformer. If unbalancing of the load between single-phase circuits becomes large, Voltage fluctuation becomes large on the three-phase side. Railway static power conditioner (RPC) was developed for the purpose of Controlling Voltage fluctuation on the three-phase side. An RPC is comprised of a pair of self-commutated PWM inverters. These inverters connect the main phase and teaser feeding buses, coupled with a DC side capacitor such as a back-to-back (BTB) converter. In this way, the two self-commutated inverters can act as a static var compensator (SVC) to compensate for the reactive power and as an active power accommodator from one feeding bus to another. 20 MVA/60 kV RPCs started commercial operation in 2002 at each two substations on the newly extended Tohoku Shinkansen for compensating Voltage fluctuation on the three-phase side caused by traction loads, absorbing harmonic current. The results of operational testing indicate that an RPC can accommodate single-phase loads such as those of PWM-controlled Shinkansen and thyristor phase-controlled Shinkansen, and handle the exciting rush current of transformers, as well as compensate for harmonics successfully. © 2007 Wiley Periodicals, Inc. Electr Eng Jpn, 162(4): 25–34, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.20397

  • Voltage fluctuation compensator for shinkansen
    Ieej Transactions on Power and Energy, 2005
    Co-Authors: Tetsuo Uzuka, Shouji Ikedo, Keiji Ueda, Yoshifumi Mochinaga, Sadao Funahashi
    Abstract:

    In AC electric Railway, three-phase Voltage is changed into the single-phase circuit of two circuits with the Scott-connected transformer. If it becomes large unbalancing of the load between single-phase circuits, Voltage fluctuation becomes large on three-phase side. Then, Railway Static Power Conditioner (RPC) was developed for the purpose of Controlling Voltage fluctuation on three-phase side. An RPC is comprised of a pair of self-commutated PWM inverters. These inverters connect the main phase and teaser feeding buses, coupled with a DC side capacitor such as a Back-To-Back (BTB) converter. In this way, the two self-commutated inverters can act as a static var compensator (SVC) to compensate for the reactive power and as an active power accommodator from one feeding bus to another.20MVA/60kV RPCs started commercial operation in 2002 at each two substations on the newly extended Tohoku Shinkansen for compensating Voltage fluctuation on three-phase side caused by traction loads, absorbing harmonic current. The results of operational testing indicate that an RPC can accommodate single-phase loads such as those of PWM-controlled Shinkansen and thyristor phase-controlled Shinkansen, and handle the exciting rush current of transformers, as well as compensate for harmonics successfully.