The Experts below are selected from a list of 38979 Experts worldwide ranked by ideXlab platform
Yanguang Han - One of the best experts on this subject based on the ideXlab platform.
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intelligent high low voltage preassembly box type transformer substation
2012Co-Authors: Yanguang HanAbstract:The utility model discloses an intelligent high-low voltage preassembly box type transformer substation, which aims at achieving remote control, remote signaling, remote measuring, remote adjusting, remote sight Power distribution management, gapless connection idle automatic compensation, no switching oscillating, no current rushing and no compensation stagnate area through the control technology of an intelligent controller. The transformer substation comprises a concrete box body (1). A 10kV ring Network Power Supply device (2) is arranged in the concrete box body, the ring Network Power Supply device is sequentially connected with a potential device (3), a low voltage Power distribution device (4), a reactive compensation device (5) and a remote meter reading device (6), and the devices are connected with the intelligent controller (8) through communication interfaces (7). A wireless data transmission terminal (9) of the intelligent controller corresponds to a wireless data transmission terminal (12) of a main station computer (11) through a wireless antenna iron tower (10). The reactive compensation device comprises a variable impedance transformer (14) controller by an antiparallel thyristor (13), the variable impedance transformer is respectively connected with a breaker (15), a vacuum contactor (16) and a current rushing restraining inductor (17), and the current rushing restraining inductor is connected with a compensation capacitor group (18). The transformer substation is used for construction of transformer substations.
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intelligent high low voltage prepackage box type transformer substation
2009Co-Authors: Yanguang HanAbstract:The utility model discloses an intelligent high-low voltage pre-assembled substation, which solves the problem of low autoimmunization level in the prior substation. The intelligent high-low voltage pre-assembled substation comprises a concrete box body (1), a 10 KV ring Network Power Supply device (2) is arranged in the concrete box body; the ring Network Power Supply device is connected with a potential device (3), low-voltage Power distribution equipment (4), a reactive Power compensator (5) and a long-distance transcription device (6) in sequence; each device is connected with an intelligent controller (8) through a communication interface (7), the wireless data transmission terminal (9) of the intelligent controller corresponds to the wireless data transmission terminal (12) of a master station computer (11) through a wireless antenna iron tower (10); the reactive Power compensator comprises a variable impedance transformer (7) controlled by an anti-parallel thyristor (13); the variable impedance transformer is respectively connected with a circuit breaker (15), a vacuum contactor (16) and an inrush current restraining inductor (17); and the inrush current restraining inductor is connected with compensation capacitor banks (18). The intelligent high-low voltage pre-assembled substation is used for the construction of a substation.
Gunwoo Moon - One of the best experts on this subject based on the ideXlab platform.
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analysis on load adaptive phase shift control for high efficiency full bridge llc resonant converter under light load conditions
IEEE Transactions on Power Electronics, 2016Co-Authors: Jaehyun Kim, Chongeun Kim, Jaekuk Kim, Jaebum Lee, Gunwoo MoonAbstract:Recently, the full-bridge (FB) LLC resonant converter is getting more attention due to its zero-voltage switching of the primary switches, zero-current switching of rectifier diodes, and high Power capability. However, the conversion efficiency is degraded under light-load conditions due to the core loss in magnetic components and the switching loss in semiconductor devices. In this paper, a new control method is proposed for the FB LLC resonant converter. In the proposed method, the frequency control is basically used to regulate the output voltage over entire load conditions. Moreover, the proposed method utilizes phase-shifted gate signals between switch legs, based on predetermined optimal duty ratio under light-load conditions. At this point, the optimal duty ratio is determined to get minimum Power loss under each light-load condition through the loss analysis of all components. Therefore, the proposed method makes high efficiency under light-load conditions. To confirm the validity of this paper, the prototype of the Network Power Supply with 320–385 V dc input and 48 V/720 W dc output is tested.
Shaoyun Ge - One of the best experts on this subject based on the ideXlab platform.
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Power distribution Network Power Supply capacity evaluation method considering n 1 criterion
2010Co-Authors: Chengshan Wang, Shuo Yao, Fengzhang Luo, Xiao Jun, Shaoyun GeAbstract:The invention belongs to the field of Power distribution systems, and relates to a method for estimating the Power Supply capacity of a Power distribution system, which takes the 'N-1' Principle into account. The method comprises the following steps: (1) the data of the Power distribution system is collected; (2) the topology of the Power distribution system is simplified, and the contact information is acquired; (3) the interconnection relation of the main transformer is analyzed to form a main transformer communication relational matrix; (4) the 'N-1' analysis of a communication unit is performed; (5) the analysis result of the step (4) is integrated to obtain the maximum allowable load factor of the main transformer; and (6) the maximum Power Supply capacity of the system is calculatedbased on the analysis result in the step (5). The invention overcomes the defects that the conventional Power distribution system is based on flow and iterative optimization, takes the capacity constraint of the actual line and the in-station priority transfer factor of a transformer station into account, provides the maximum Power Supply capacity of the Power distribution system based on the 'N-1' Principle and the one-time calculation of the interconnection relation, and finds out the Network bottleneck when in calculation, thereby providing the reference basis for optimization and planningof the Power distribution system.
Jaehyun Kim - One of the best experts on this subject based on the ideXlab platform.
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analysis on load adaptive phase shift control for high efficiency full bridge llc resonant converter under light load conditions
IEEE Transactions on Power Electronics, 2016Co-Authors: Jaehyun Kim, Chongeun Kim, Jaekuk Kim, Jaebum Lee, Gunwoo MoonAbstract:Recently, the full-bridge (FB) LLC resonant converter is getting more attention due to its zero-voltage switching of the primary switches, zero-current switching of rectifier diodes, and high Power capability. However, the conversion efficiency is degraded under light-load conditions due to the core loss in magnetic components and the switching loss in semiconductor devices. In this paper, a new control method is proposed for the FB LLC resonant converter. In the proposed method, the frequency control is basically used to regulate the output voltage over entire load conditions. Moreover, the proposed method utilizes phase-shifted gate signals between switch legs, based on predetermined optimal duty ratio under light-load conditions. At this point, the optimal duty ratio is determined to get minimum Power loss under each light-load condition through the loss analysis of all components. Therefore, the proposed method makes high efficiency under light-load conditions. To confirm the validity of this paper, the prototype of the Network Power Supply with 320–385 V dc input and 48 V/720 W dc output is tested.
Chengshan Wang - One of the best experts on this subject based on the ideXlab platform.
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Power distribution Network Power Supply capacity evaluation method considering n 1 criterion
2010Co-Authors: Chengshan Wang, Shuo Yao, Fengzhang Luo, Xiao Jun, Shaoyun GeAbstract:The invention belongs to the field of Power distribution systems, and relates to a method for estimating the Power Supply capacity of a Power distribution system, which takes the 'N-1' Principle into account. The method comprises the following steps: (1) the data of the Power distribution system is collected; (2) the topology of the Power distribution system is simplified, and the contact information is acquired; (3) the interconnection relation of the main transformer is analyzed to form a main transformer communication relational matrix; (4) the 'N-1' analysis of a communication unit is performed; (5) the analysis result of the step (4) is integrated to obtain the maximum allowable load factor of the main transformer; and (6) the maximum Power Supply capacity of the system is calculatedbased on the analysis result in the step (5). The invention overcomes the defects that the conventional Power distribution system is based on flow and iterative optimization, takes the capacity constraint of the actual line and the in-station priority transfer factor of a transformer station into account, provides the maximum Power Supply capacity of the Power distribution system based on the 'N-1' Principle and the one-time calculation of the interconnection relation, and finds out the Network bottleneck when in calculation, thereby providing the reference basis for optimization and planningof the Power distribution system.