The Experts below are selected from a list of 59151 Experts worldwide ranked by ideXlab platform

Jianguo Jiang - One of the best experts on this subject based on the ideXlab platform.

  • a г Source Circuit breaker for dc microgrid protection
    IEEE Transactions on Industrial Electronics, 2021
    Co-Authors: Zhongzheng Zhou, Jianguo Jiang, Cong Liu, Dan Zhang
    Abstract:

    In this article, a novel Г-Source Circuit breaker (CB) that can offer automatic fault isolation with no reflected fault current in the feeding Source is proposed for the protection of dc microgrids. Compared with conventional Z-Source CBs, this topology utilizes fewer elements through the magnetic coupling, thus allowing a considerably reduced volume and weight. To accurately quantify the breaker elements, detailed modeling over both short-Circuit and overload faults is carried out. The derived equations are significantly valuable for guiding the implementation of the novel breaker. A soft-starting Circuit is also introduced to limit the capacitor charging current when reenergizing the breaker. In addition, a bidirectional Г-Source CB extended from the unidirectional topology with the same impedance network is discussed. If required, a crowbar-type switch, which allows the breaker to be manually tripped, can be conveniently integrated into the Г-Source CB. This manual tripping switch is useful for clearing steady-state overload faults. Moreover, experimental waveforms of fault-clearing and manual tripping operations are included to validate the effectiveness of the novel CB.

  • Novel Bidirectional O-Z-Source Circuit Breaker for DC Microgrid Protection
    IEEE Transactions on Power Electronics, 2021
    Co-Authors: Zhongzheng Zhou, Jiayan Jiang, Dirui Yang, Jianguo Jiang
    Abstract:

    DC microgrids that feature a simple and efficient integration with renewable energy Sources and energy storage elements have drawn increasing attention in industrial applications. In this article, a bidirectional Z-Source Circuit breaker with an O-shaped impedance network (abbreviated as O-Z-Source Circuit breaker) is proposed to guarantee the reliable operation of dc microgrids. By a simplified structure, the O-Z-Source Circuit breaker allows bidirectional power flow with fewer components compared with conventional Z-Source Circuit breakers. Increased operating power efficiency can also be obtained from the novel topology. Based on detailed mathematical models, design equations are derived for sizing the components in the O-Z-Source Circuit breaker. Moreover, a new concept of equivalent capacitance that is useful for estimating the minimum detectable fault ramp rate for Z-Source Circuit breakers is presented. A discussion over snubber Circuits of the proposed breaker is also included. Finally, a laboratory prototype has been built to verify the analysis and design the O-Z-Source Circuit breaker.

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

  • special point type led light emitting diode light Source lamp and point type lamp light Source Circuit for railway signals
    2012
    Co-Authors: Hua Wang, Jingde Song, Fengtian Li, Yakui Zhang, Zhaoxia Wang, Mingcheng Wang
    Abstract:

    The utility model relates to a special point type LED (Light-Emitting Diode) light Source lamp and point type lamp light Source Circuit for railway signals, which is of a special novel LED signal mechanism for the railway signals, and has the advantages of being environment-friendly, energy-saving and long in service life. The special point type LED light Source lamp and point type lamp light Source Circuit for the railway signals comprises a point type LED light Source lamp and a point type lamp light Source Circuit. The point type LED light Source lamp consists of a radiator, a lamp cap inner sleeve, a lamp shade, a light-condensing lens, a luminous body and a prefocus plate lamp cap, the luminous body consists of a main lamp and an auxiliary lamp; the radiator adopts a sheet type radiator, a heat-conducting aluminous substrate and a heat-conducting aluminous substrate installing hole are arranged on one side of the radiator, the heat-conducting aluminous substrate is arranged in the heat-conducting aluminous substrate installing hole, the main lamp and the auxiliary lamp are arranged on the heat-conducting aluminous substrate, the lamp shade and the light-condensing lens are arranged on the outer side of the heat-conducting aluminous substrate, the lamp cap inner sleeve is arranged at the lower part of the radiator, and the prefocus plate lamp cap is arranged and fixed outside the lamp cap inner sleeve; and the point-Source lamp Circuit consists of a power supply part, a signal sampling part, a signal processing, analyzing and controlling part, and an LED driving part.

  • point type led light emitting diode light Source lamp special for railway signal and point lamp light Source Circuit
    2012
    Co-Authors: Hua Wang, Chaoxia Wang, Jingde Song, Fengtian Li, Yakui Zhang, Mingcheng Wang
    Abstract:

    The invention relates to a point type LED (Light Emitting Diode) light Source lamp special for a railway signal and a point lamp light Source Circuit, and discloses a novel LED signal mechanism special for the railway signal, which has the characteristics of environmental friendliness, energy conservation and long life. The LED signal mechanism consists of the point type LED light Source lamp andthe point lamp light Source Circuit, wherein the point type LED light Source lamp comprises a radiator, a lamp cap inner sleeve, a lamp housing, a collecting lens, a luminous body and a pre-focus plate lamp cap; the luminous body consists of a main lamp and a secondary lamp; the adopted radiator is a finned radiator; a heat-conducting aluminum substrate and a heat-conducting aluminum substrate mounting hole are formed on one side of the radiator; the heat-conducting aluminum substrate is arranged in the heat-conducting aluminum substrate mounting hole; the main lamp and the secondary lamp arearranged on the heat-conducting aluminum substrate; the lamp housing and the collecting lens are arranged outside the heat-conducting aluminum substrate; the lamp cap inner sleeve is arranged on the lower part of the radiator; the pre-focus plate lamp cap is fixedly arranged outside the lamp cap inner sleeve; and the point lamp light Source Circuit comprises a power part, a signal sampling part, a signal processing, analyzing and control part and an LED driving part.

Zhongzheng Zhou - One of the best experts on this subject based on the ideXlab platform.

  • a г Source Circuit breaker for dc microgrid protection
    IEEE Transactions on Industrial Electronics, 2021
    Co-Authors: Zhongzheng Zhou, Jianguo Jiang, Cong Liu, Dan Zhang
    Abstract:

    In this article, a novel Г-Source Circuit breaker (CB) that can offer automatic fault isolation with no reflected fault current in the feeding Source is proposed for the protection of dc microgrids. Compared with conventional Z-Source CBs, this topology utilizes fewer elements through the magnetic coupling, thus allowing a considerably reduced volume and weight. To accurately quantify the breaker elements, detailed modeling over both short-Circuit and overload faults is carried out. The derived equations are significantly valuable for guiding the implementation of the novel breaker. A soft-starting Circuit is also introduced to limit the capacitor charging current when reenergizing the breaker. In addition, a bidirectional Г-Source CB extended from the unidirectional topology with the same impedance network is discussed. If required, a crowbar-type switch, which allows the breaker to be manually tripped, can be conveniently integrated into the Г-Source CB. This manual tripping switch is useful for clearing steady-state overload faults. Moreover, experimental waveforms of fault-clearing and manual tripping operations are included to validate the effectiveness of the novel CB.

  • Novel Bidirectional O-Z-Source Circuit Breaker for DC Microgrid Protection
    IEEE Transactions on Power Electronics, 2021
    Co-Authors: Zhongzheng Zhou, Jiayan Jiang, Dirui Yang, Jianguo Jiang
    Abstract:

    DC microgrids that feature a simple and efficient integration with renewable energy Sources and energy storage elements have drawn increasing attention in industrial applications. In this article, a bidirectional Z-Source Circuit breaker with an O-shaped impedance network (abbreviated as O-Z-Source Circuit breaker) is proposed to guarantee the reliable operation of dc microgrids. By a simplified structure, the O-Z-Source Circuit breaker allows bidirectional power flow with fewer components compared with conventional Z-Source Circuit breakers. Increased operating power efficiency can also be obtained from the novel topology. Based on detailed mathematical models, design equations are derived for sizing the components in the O-Z-Source Circuit breaker. Moreover, a new concept of equivalent capacitance that is useful for estimating the minimum detectable fault ramp rate for Z-Source Circuit breakers is presented. A discussion over snubber Circuits of the proposed breaker is also included. Finally, a laboratory prototype has been built to verify the analysis and design the O-Z-Source Circuit breaker.

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

  • special point type led light emitting diode light Source lamp and point type lamp light Source Circuit for railway signals
    2012
    Co-Authors: Hua Wang, Jingde Song, Fengtian Li, Yakui Zhang, Zhaoxia Wang, Mingcheng Wang
    Abstract:

    The utility model relates to a special point type LED (Light-Emitting Diode) light Source lamp and point type lamp light Source Circuit for railway signals, which is of a special novel LED signal mechanism for the railway signals, and has the advantages of being environment-friendly, energy-saving and long in service life. The special point type LED light Source lamp and point type lamp light Source Circuit for the railway signals comprises a point type LED light Source lamp and a point type lamp light Source Circuit. The point type LED light Source lamp consists of a radiator, a lamp cap inner sleeve, a lamp shade, a light-condensing lens, a luminous body and a prefocus plate lamp cap, the luminous body consists of a main lamp and an auxiliary lamp; the radiator adopts a sheet type radiator, a heat-conducting aluminous substrate and a heat-conducting aluminous substrate installing hole are arranged on one side of the radiator, the heat-conducting aluminous substrate is arranged in the heat-conducting aluminous substrate installing hole, the main lamp and the auxiliary lamp are arranged on the heat-conducting aluminous substrate, the lamp shade and the light-condensing lens are arranged on the outer side of the heat-conducting aluminous substrate, the lamp cap inner sleeve is arranged at the lower part of the radiator, and the prefocus plate lamp cap is arranged and fixed outside the lamp cap inner sleeve; and the point-Source lamp Circuit consists of a power supply part, a signal sampling part, a signal processing, analyzing and controlling part, and an LED driving part.

  • point type led light emitting diode light Source lamp special for railway signal and point lamp light Source Circuit
    2012
    Co-Authors: Hua Wang, Chaoxia Wang, Jingde Song, Fengtian Li, Yakui Zhang, Mingcheng Wang
    Abstract:

    The invention relates to a point type LED (Light Emitting Diode) light Source lamp special for a railway signal and a point lamp light Source Circuit, and discloses a novel LED signal mechanism special for the railway signal, which has the characteristics of environmental friendliness, energy conservation and long life. The LED signal mechanism consists of the point type LED light Source lamp andthe point lamp light Source Circuit, wherein the point type LED light Source lamp comprises a radiator, a lamp cap inner sleeve, a lamp housing, a collecting lens, a luminous body and a pre-focus plate lamp cap; the luminous body consists of a main lamp and a secondary lamp; the adopted radiator is a finned radiator; a heat-conducting aluminum substrate and a heat-conducting aluminum substrate mounting hole are formed on one side of the radiator; the heat-conducting aluminum substrate is arranged in the heat-conducting aluminum substrate mounting hole; the main lamp and the secondary lamp arearranged on the heat-conducting aluminum substrate; the lamp housing and the collecting lens are arranged outside the heat-conducting aluminum substrate; the lamp cap inner sleeve is arranged on the lower part of the radiator; the pre-focus plate lamp cap is fixedly arranged outside the lamp cap inner sleeve; and the point lamp light Source Circuit comprises a power part, a signal sampling part, a signal processing, analyzing and control part and an LED driving part.

Dan Zhang - One of the best experts on this subject based on the ideXlab platform.

  • a г Source Circuit breaker for dc microgrid protection
    IEEE Transactions on Industrial Electronics, 2021
    Co-Authors: Zhongzheng Zhou, Jianguo Jiang, Cong Liu, Dan Zhang
    Abstract:

    In this article, a novel Г-Source Circuit breaker (CB) that can offer automatic fault isolation with no reflected fault current in the feeding Source is proposed for the protection of dc microgrids. Compared with conventional Z-Source CBs, this topology utilizes fewer elements through the magnetic coupling, thus allowing a considerably reduced volume and weight. To accurately quantify the breaker elements, detailed modeling over both short-Circuit and overload faults is carried out. The derived equations are significantly valuable for guiding the implementation of the novel breaker. A soft-starting Circuit is also introduced to limit the capacitor charging current when reenergizing the breaker. In addition, a bidirectional Г-Source CB extended from the unidirectional topology with the same impedance network is discussed. If required, a crowbar-type switch, which allows the breaker to be manually tripped, can be conveniently integrated into the Г-Source CB. This manual tripping switch is useful for clearing steady-state overload faults. Moreover, experimental waveforms of fault-clearing and manual tripping operations are included to validate the effectiveness of the novel CB.