The Experts below are selected from a list of 282 Experts worldwide ranked by ideXlab platform
Qianggang Wang - One of the best experts on this subject based on the ideXlab platform.
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Unbalanced Voltage Suppression in a Bipolar DC Distribution Network Based on DC Electric Springs
IEEE Transactions on Smart Grid, 2020Co-Authors: Jianquan Liao, Niancheng Zhou, Yuansheng Huang, Qianggang WangAbstract:In this paper, a method is proposed to mitigate unbalanced voltage and reduce power losses due to neutral line current in a bipolar direct current (DC) distribution network by introducing a DC electric spring (DC-ES). The coupling relationship between positive and Negative Pole voltages are investigated given the resistance of neutral line in the bipolar DC distribution network. The coupling matrixes of the positive and Negative Pole voltages and the DC-ES output voltages are deduced. And this matrixes demonstrate that the DC-ES control system is composed of double inputs of Pole voltages and double outputs of DC-ES voltages. The small-signal model of the bipolar DC distribution network with DC-ESs is derived further. Subsequently, the control system with double inputs and outputs is transformed into two independent control systems by introducing the decoupling control variables, thereby increasing its rapidity and anti-interference performance significantly. The proposed unbalanced voltage suppression method and decoupling control of DC-ESs are validated by simulations and experiments.
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Decoupling control for DC electric spring-based unbalanced voltage suppression in a bipolar DC distribution system
IEEE Transactions on Industrial Electronics, 1Co-Authors: Jianquan Liao, Niancheng Zhou, Yuansheng Huang, Qianggang WangAbstract:The use of bipolar direct current (DC) distribution systems introduces the possibility of unbalanced voltage (current). This situation increases the voltage deviations and power losses at each node owing to the presence of a neutral line current. This study proposes a method that mitigates the unbalanced voltage caused by constant power loads (CPLs) by DC electric springs (DC—ESs). A linearized model is used in the small-signal analysis of CPLs. On this basis, the coupling relationship between positive and Negative Pole voltages is analyzed. After DC—ESs are introduced, the positive and Negative Pole voltages and DC—ES output voltages are found to be closely related, thereby increasing the complexity of the control system. Therefore, a feedforward decoupling control block diagram is introduced on the basis of the small-signal model analysis of DC—ESs in a single node of the bipolar DC system. The control system is simplified, and different control loops can be independently controlled. Thus, the rapidity and anti-interference performance of the control system are greatly enhanced. Simulation and experimental results of the unbalanced voltage suppression in the bipolar DC system are used to verify the effectiveness of the proposed scheme.
Jianquan Liao - One of the best experts on this subject based on the ideXlab platform.
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Unbalanced Voltage Suppression in a Bipolar DC Distribution Network Based on DC Electric Springs
IEEE Transactions on Smart Grid, 2020Co-Authors: Jianquan Liao, Niancheng Zhou, Yuansheng Huang, Qianggang WangAbstract:In this paper, a method is proposed to mitigate unbalanced voltage and reduce power losses due to neutral line current in a bipolar direct current (DC) distribution network by introducing a DC electric spring (DC-ES). The coupling relationship between positive and Negative Pole voltages are investigated given the resistance of neutral line in the bipolar DC distribution network. The coupling matrixes of the positive and Negative Pole voltages and the DC-ES output voltages are deduced. And this matrixes demonstrate that the DC-ES control system is composed of double inputs of Pole voltages and double outputs of DC-ES voltages. The small-signal model of the bipolar DC distribution network with DC-ESs is derived further. Subsequently, the control system with double inputs and outputs is transformed into two independent control systems by introducing the decoupling control variables, thereby increasing its rapidity and anti-interference performance significantly. The proposed unbalanced voltage suppression method and decoupling control of DC-ESs are validated by simulations and experiments.
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Decoupling control for DC electric spring-based unbalanced voltage suppression in a bipolar DC distribution system
IEEE Transactions on Industrial Electronics, 1Co-Authors: Jianquan Liao, Niancheng Zhou, Yuansheng Huang, Qianggang WangAbstract:The use of bipolar direct current (DC) distribution systems introduces the possibility of unbalanced voltage (current). This situation increases the voltage deviations and power losses at each node owing to the presence of a neutral line current. This study proposes a method that mitigates the unbalanced voltage caused by constant power loads (CPLs) by DC electric springs (DC—ESs). A linearized model is used in the small-signal analysis of CPLs. On this basis, the coupling relationship between positive and Negative Pole voltages is analyzed. After DC—ESs are introduced, the positive and Negative Pole voltages and DC—ES output voltages are found to be closely related, thereby increasing the complexity of the control system. Therefore, a feedforward decoupling control block diagram is introduced on the basis of the small-signal model analysis of DC—ESs in a single node of the bipolar DC system. The control system is simplified, and different control loops can be independently controlled. Thus, the rapidity and anti-interference performance of the control system are greatly enhanced. Simulation and experimental results of the unbalanced voltage suppression in the bipolar DC system are used to verify the effectiveness of the proposed scheme.
Yuansheng Huang - One of the best experts on this subject based on the ideXlab platform.
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Unbalanced Voltage Suppression in a Bipolar DC Distribution Network Based on DC Electric Springs
IEEE Transactions on Smart Grid, 2020Co-Authors: Jianquan Liao, Niancheng Zhou, Yuansheng Huang, Qianggang WangAbstract:In this paper, a method is proposed to mitigate unbalanced voltage and reduce power losses due to neutral line current in a bipolar direct current (DC) distribution network by introducing a DC electric spring (DC-ES). The coupling relationship between positive and Negative Pole voltages are investigated given the resistance of neutral line in the bipolar DC distribution network. The coupling matrixes of the positive and Negative Pole voltages and the DC-ES output voltages are deduced. And this matrixes demonstrate that the DC-ES control system is composed of double inputs of Pole voltages and double outputs of DC-ES voltages. The small-signal model of the bipolar DC distribution network with DC-ESs is derived further. Subsequently, the control system with double inputs and outputs is transformed into two independent control systems by introducing the decoupling control variables, thereby increasing its rapidity and anti-interference performance significantly. The proposed unbalanced voltage suppression method and decoupling control of DC-ESs are validated by simulations and experiments.
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Decoupling control for DC electric spring-based unbalanced voltage suppression in a bipolar DC distribution system
IEEE Transactions on Industrial Electronics, 1Co-Authors: Jianquan Liao, Niancheng Zhou, Yuansheng Huang, Qianggang WangAbstract:The use of bipolar direct current (DC) distribution systems introduces the possibility of unbalanced voltage (current). This situation increases the voltage deviations and power losses at each node owing to the presence of a neutral line current. This study proposes a method that mitigates the unbalanced voltage caused by constant power loads (CPLs) by DC electric springs (DC—ESs). A linearized model is used in the small-signal analysis of CPLs. On this basis, the coupling relationship between positive and Negative Pole voltages is analyzed. After DC—ESs are introduced, the positive and Negative Pole voltages and DC—ES output voltages are found to be closely related, thereby increasing the complexity of the control system. Therefore, a feedforward decoupling control block diagram is introduced on the basis of the small-signal model analysis of DC—ESs in a single node of the bipolar DC system. The control system is simplified, and different control loops can be independently controlled. Thus, the rapidity and anti-interference performance of the control system are greatly enhanced. Simulation and experimental results of the unbalanced voltage suppression in the bipolar DC system are used to verify the effectiveness of the proposed scheme.
Niancheng Zhou - One of the best experts on this subject based on the ideXlab platform.
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Unbalanced Voltage Suppression in a Bipolar DC Distribution Network Based on DC Electric Springs
IEEE Transactions on Smart Grid, 2020Co-Authors: Jianquan Liao, Niancheng Zhou, Yuansheng Huang, Qianggang WangAbstract:In this paper, a method is proposed to mitigate unbalanced voltage and reduce power losses due to neutral line current in a bipolar direct current (DC) distribution network by introducing a DC electric spring (DC-ES). The coupling relationship between positive and Negative Pole voltages are investigated given the resistance of neutral line in the bipolar DC distribution network. The coupling matrixes of the positive and Negative Pole voltages and the DC-ES output voltages are deduced. And this matrixes demonstrate that the DC-ES control system is composed of double inputs of Pole voltages and double outputs of DC-ES voltages. The small-signal model of the bipolar DC distribution network with DC-ESs is derived further. Subsequently, the control system with double inputs and outputs is transformed into two independent control systems by introducing the decoupling control variables, thereby increasing its rapidity and anti-interference performance significantly. The proposed unbalanced voltage suppression method and decoupling control of DC-ESs are validated by simulations and experiments.
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Decoupling control for DC electric spring-based unbalanced voltage suppression in a bipolar DC distribution system
IEEE Transactions on Industrial Electronics, 1Co-Authors: Jianquan Liao, Niancheng Zhou, Yuansheng Huang, Qianggang WangAbstract:The use of bipolar direct current (DC) distribution systems introduces the possibility of unbalanced voltage (current). This situation increases the voltage deviations and power losses at each node owing to the presence of a neutral line current. This study proposes a method that mitigates the unbalanced voltage caused by constant power loads (CPLs) by DC electric springs (DC—ESs). A linearized model is used in the small-signal analysis of CPLs. On this basis, the coupling relationship between positive and Negative Pole voltages is analyzed. After DC—ESs are introduced, the positive and Negative Pole voltages and DC—ES output voltages are found to be closely related, thereby increasing the complexity of the control system. Therefore, a feedforward decoupling control block diagram is introduced on the basis of the small-signal model analysis of DC—ESs in a single node of the bipolar DC system. The control system is simplified, and different control loops can be independently controlled. Thus, the rapidity and anti-interference performance of the control system are greatly enhanced. Simulation and experimental results of the unbalanced voltage suppression in the bipolar DC system are used to verify the effectiveness of the proposed scheme.
Richard Nuccitelli - One of the best experts on this subject based on the ideXlab platform.
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human keratinocytes migrate to the Negative Pole in direct current electric fields comparable to those measured in mammalian wounds
Journal of Cell Science, 1996Co-Authors: Karen Y Nishimura, Roslyn Rivkah Isseroff, Richard NuccitelliAbstract:Previous measurements of the lateral electric fields near skin wounds in guinea pigs have detected DC fields between 100–200 mV/mm near the edge of the wound. We have studied the translocation response of motile primary human keratinocytes migrating on a collagen substrate while exposed to similar physiological DC electric fields. We find that keratinocytes migrate randomly on collagen in fields of 5 mV/mm or less, but in larger fields they migrate towards the Negative Pole of the field, exhibiting galvanotaxis. Since these cells have an average cell length of 50 microns, this implies that they are able to detect a voltage gradient as low as 0.5 mV along their length. This cath-odally-directed movement exhibits increased directedness with increasing field strengths between 10 and 100 mV/mm. We observe a maximally directed response at 100 mV/mm with half of the cells responding to the field within 14 minutes. The average speed of migration tended to be greater in fields above 50 mV/mm than in smaller fields. We conclude that human keratinocytes migrate towards the Negative Pole in DC electric fields that are of the same magnitude as measured in vivo near wounds in mammalian skin.
