The Experts below are selected from a list of 14664 Experts worldwide ranked by ideXlab platform
Huangfu Haiwen - One of the best experts on this subject based on the ideXlab platform.
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urban rail transit ground lithium ion battery energy storage system control method capable of adjusting Discharge threshold value based on pi ring
2018Co-Authors: Xiong Shi, Guo Tingting, Yang Zhongping, Lin Fei, Huangfu HaiwenAbstract:The invention relates to an urban rail transit ground lithium ion battery energy storage system control method capable of adjusting a Discharge threshold value based on a PI ring and belongs to the urban rail transit control field. According to the method, the Actual Discharge threshold value of network voltage is calculated; when a train is towed, the network voltage of a traction network drops,when the network voltage falls below Discharge threshold voltage, the traction network is connected with a high-power DC/DC device of a lithium battery energy storage system so as to enter a Dischargevoltage loop, and therefore, the lithium battery energy storage system performs discharging to maintain the voltage of the traction network near the Discharge threshold voltage; and when the train isbraked, the network voltage of the traction network rises, when the network voltage rises above a charge threshold value, the traction network is connected with the high-power DC/DC device of the lithium battery energy storage system so as to enter a charge voltage loop, and therefore, the lithium battery energy storage system performs charging to maintain the voltage of the traction network nearthe charge threshold value. With the method of the invention adopted, the problem of SOC offset caused by existing fixed threshold control can be solved, and the lithium battery energy storage systemcan work near the SOC value of a point where the power of the system is the highest.
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dynamic adjustment control method of Discharge threshold for urban rail transit battery storage system based on energy transfer
2018Co-Authors: Guo Tingting, Xiong Shi, Yang Zhongping, Lin Fei, Huangfu HaiwenAbstract:The invention relates to relates to the technology of urban rail transit energy storage and specifically to a dynamic adjustment control method of Discharge threshold for an urban rail transit batterystorage system based on energy transfer. The method of the invention comprises following steps: a control system of a battery energy storage system is communicated with a battery a manage system to obtain the voltage, current and SOC parameters of the battery in real time; the busbar voltage Udc can be obtained through a voltage sensor; according to a set SOC reference value SOCref, the Actual SOC value of the energy storage system is compared with the SOCref to obtain the difference [delta]SOC between the two; a corrected quantity [delta]U of a Discharge threshold is obtained through a section proportional regulator; an Actual Discharge threshold value Udis is obtained according to an initial Discharge threshold value Udis0 and the corrected quantity [delta]U of a Discharge threshold. According to the invention, SOC of the energy storage system can be made fluctuate within one scope to prevent the SOC of the energy storage system from being too high or too low; the Discharge quantityof the energy storage system is enlarged and the substation output power peak value is reduced.
M. Okabayashi - One of the best experts on this subject based on the ideXlab platform.
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Spreading of lower hybrid wave driven currents in PBX-M
Nuclear Fusion, 1996Co-Authors: D. Ignat, R. Kaita, Stephen Jardin, M. OkabayashiAbstract:Lower hybrid current drive (LHCD) in the tokamak Princeton Beta Experiment-Modification (PBX-M) is computed with a dynamic model in order to understand an Actual Discharge aimed at raising the central q above unity. Such configurations offer advantages for steady state operation and plasma stability. For the particular parameters of this PBX-M experiment, the calculation found singular profiles of plasma current density J and safety factor q developing soon after LHCD begins. Smoothing the lower hybrid wave driven current and power using a diffusion-like equation and a velocity-independent diffusivity for fast-electron current brought the model into reasonable agreement with the measurements if Dfast approximately=1.0 m2/s. Such a value for Dfast is in the range suggested by other work
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Spreading of wave-driven currents in a tokamak
1996Co-Authors: D. Ignat, R. Kaita, Stephen Jardin, M. OkabayashiAbstract:Lower hybrid current drive (LHCD) in the tokamak Princeton Beta Experiment-Modification (PBX-M) is computed with a dynamic model in order to understand an Actual Discharge aimed at raising the central q above unity. Such configurations offer advantages for steady-state operation and plasma stability. For the particular parameters of this PBX-M experiment, the calculation found singular profiles of plasma current density J and safety factor q developing soon after LHCD begins. Smoothing the lower hybrid-driven current and power using a diffusion-Eke equation and a velocity-independent diffusivity for fast-electron current brought the model into reasonable agreement with the measurements if D{sub fast} {approx} 1.0 m{sup 2}/s. Such a value for D{sub fast} is in the range suggested by other work.
Guo Tingting - One of the best experts on this subject based on the ideXlab platform.
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urban rail transit ground lithium ion battery energy storage system control method capable of adjusting Discharge threshold value based on pi ring
2018Co-Authors: Xiong Shi, Guo Tingting, Yang Zhongping, Lin Fei, Huangfu HaiwenAbstract:The invention relates to an urban rail transit ground lithium ion battery energy storage system control method capable of adjusting a Discharge threshold value based on a PI ring and belongs to the urban rail transit control field. According to the method, the Actual Discharge threshold value of network voltage is calculated; when a train is towed, the network voltage of a traction network drops,when the network voltage falls below Discharge threshold voltage, the traction network is connected with a high-power DC/DC device of a lithium battery energy storage system so as to enter a Dischargevoltage loop, and therefore, the lithium battery energy storage system performs discharging to maintain the voltage of the traction network near the Discharge threshold voltage; and when the train isbraked, the network voltage of the traction network rises, when the network voltage rises above a charge threshold value, the traction network is connected with the high-power DC/DC device of the lithium battery energy storage system so as to enter a charge voltage loop, and therefore, the lithium battery energy storage system performs charging to maintain the voltage of the traction network nearthe charge threshold value. With the method of the invention adopted, the problem of SOC offset caused by existing fixed threshold control can be solved, and the lithium battery energy storage systemcan work near the SOC value of a point where the power of the system is the highest.
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dynamic adjustment control method of Discharge threshold for urban rail transit battery storage system based on energy transfer
2018Co-Authors: Guo Tingting, Xiong Shi, Yang Zhongping, Lin Fei, Huangfu HaiwenAbstract:The invention relates to relates to the technology of urban rail transit energy storage and specifically to a dynamic adjustment control method of Discharge threshold for an urban rail transit batterystorage system based on energy transfer. The method of the invention comprises following steps: a control system of a battery energy storage system is communicated with a battery a manage system to obtain the voltage, current and SOC parameters of the battery in real time; the busbar voltage Udc can be obtained through a voltage sensor; according to a set SOC reference value SOCref, the Actual SOC value of the energy storage system is compared with the SOCref to obtain the difference [delta]SOC between the two; a corrected quantity [delta]U of a Discharge threshold is obtained through a section proportional regulator; an Actual Discharge threshold value Udis is obtained according to an initial Discharge threshold value Udis0 and the corrected quantity [delta]U of a Discharge threshold. According to the invention, SOC of the energy storage system can be made fluctuate within one scope to prevent the SOC of the energy storage system from being too high or too low; the Discharge quantityof the energy storage system is enlarged and the substation output power peak value is reduced.
Xiong Shi - One of the best experts on this subject based on the ideXlab platform.
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urban rail transit ground lithium ion battery energy storage system control method capable of adjusting Discharge threshold value based on pi ring
2018Co-Authors: Xiong Shi, Guo Tingting, Yang Zhongping, Lin Fei, Huangfu HaiwenAbstract:The invention relates to an urban rail transit ground lithium ion battery energy storage system control method capable of adjusting a Discharge threshold value based on a PI ring and belongs to the urban rail transit control field. According to the method, the Actual Discharge threshold value of network voltage is calculated; when a train is towed, the network voltage of a traction network drops,when the network voltage falls below Discharge threshold voltage, the traction network is connected with a high-power DC/DC device of a lithium battery energy storage system so as to enter a Dischargevoltage loop, and therefore, the lithium battery energy storage system performs discharging to maintain the voltage of the traction network near the Discharge threshold voltage; and when the train isbraked, the network voltage of the traction network rises, when the network voltage rises above a charge threshold value, the traction network is connected with the high-power DC/DC device of the lithium battery energy storage system so as to enter a charge voltage loop, and therefore, the lithium battery energy storage system performs charging to maintain the voltage of the traction network nearthe charge threshold value. With the method of the invention adopted, the problem of SOC offset caused by existing fixed threshold control can be solved, and the lithium battery energy storage systemcan work near the SOC value of a point where the power of the system is the highest.
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dynamic adjustment control method of Discharge threshold for urban rail transit battery storage system based on energy transfer
2018Co-Authors: Guo Tingting, Xiong Shi, Yang Zhongping, Lin Fei, Huangfu HaiwenAbstract:The invention relates to relates to the technology of urban rail transit energy storage and specifically to a dynamic adjustment control method of Discharge threshold for an urban rail transit batterystorage system based on energy transfer. The method of the invention comprises following steps: a control system of a battery energy storage system is communicated with a battery a manage system to obtain the voltage, current and SOC parameters of the battery in real time; the busbar voltage Udc can be obtained through a voltage sensor; according to a set SOC reference value SOCref, the Actual SOC value of the energy storage system is compared with the SOCref to obtain the difference [delta]SOC between the two; a corrected quantity [delta]U of a Discharge threshold is obtained through a section proportional regulator; an Actual Discharge threshold value Udis is obtained according to an initial Discharge threshold value Udis0 and the corrected quantity [delta]U of a Discharge threshold. According to the invention, SOC of the energy storage system can be made fluctuate within one scope to prevent the SOC of the energy storage system from being too high or too low; the Discharge quantityof the energy storage system is enlarged and the substation output power peak value is reduced.
D. Ignat - One of the best experts on this subject based on the ideXlab platform.
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Spreading of lower hybrid wave driven currents in PBX-M
Nuclear Fusion, 1996Co-Authors: D. Ignat, R. Kaita, Stephen Jardin, M. OkabayashiAbstract:Lower hybrid current drive (LHCD) in the tokamak Princeton Beta Experiment-Modification (PBX-M) is computed with a dynamic model in order to understand an Actual Discharge aimed at raising the central q above unity. Such configurations offer advantages for steady state operation and plasma stability. For the particular parameters of this PBX-M experiment, the calculation found singular profiles of plasma current density J and safety factor q developing soon after LHCD begins. Smoothing the lower hybrid wave driven current and power using a diffusion-like equation and a velocity-independent diffusivity for fast-electron current brought the model into reasonable agreement with the measurements if Dfast approximately=1.0 m2/s. Such a value for Dfast is in the range suggested by other work
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Spreading of wave-driven currents in a tokamak
1996Co-Authors: D. Ignat, R. Kaita, Stephen Jardin, M. OkabayashiAbstract:Lower hybrid current drive (LHCD) in the tokamak Princeton Beta Experiment-Modification (PBX-M) is computed with a dynamic model in order to understand an Actual Discharge aimed at raising the central q above unity. Such configurations offer advantages for steady-state operation and plasma stability. For the particular parameters of this PBX-M experiment, the calculation found singular profiles of plasma current density J and safety factor q developing soon after LHCD begins. Smoothing the lower hybrid-driven current and power using a diffusion-Eke equation and a velocity-independent diffusivity for fast-electron current brought the model into reasonable agreement with the measurements if D{sub fast} {approx} 1.0 m{sup 2}/s. Such a value for D{sub fast} is in the range suggested by other work.
