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公开(公告)号：US20170047862A1
公开(公告)日：2017-02-16
申请号：US15307809
申请日：2014-09-15
发明人： An Luo , Yandong Chen , Mingyue Wang , Qingchang Zhong , Leming Zhou , Yuan Huang , Zhiyong Chen , Xiaoping Zhou , Huimin Kuang , Mingshen Li
CPC分类号： H02M7/53871 , H02J3/38 , H02J3/48 , H02M1/126 , H02M7/5395 , H02M2007/4815 , Y02B70/1441
摘要： A steady state control method for a three-phase double-mode inverter. Off-grid steady state control is composed of outer loop power droop control, voltage feed-forward quasi-resonant control, and inner current loop dead-beat control. Therefore, the response speed of the inverter is raised, and the influence caused by the load fluctuation of a micro-grid is inhibited. Based on the off-grid steady state control, grid-connected steady state control introduces phase lead control to the power droop control. Therefore, the output voltage of the inverter is always slightly ahead of the power grid voltage, which avoids the energy pour backward phenomenon of the inverter due to a phase error, and realizes stable and reliable running in the grid-connected mode.
摘要翻译： 一种三相双模逆变器的稳态控制方法。 离网稳态控制由外环功率下垂控制，电压前馈准谐振控制和内部电流环路死区控制组成。 因此，逆变器的响应速度提高，并且微小电网的负载波动引起的影响被抑制。 基于离网稳态控制，并网稳态控制将相位牵引控制引入功率下降控制。 因此，逆变器的输出电压总是略高于电网电压，避免了由于相位误差引起的逆变器的能量倒退现象，实现了并网模式下稳定可靠的运行。
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72.发明公开公开(公告)号：US20240316716A1
公开(公告)日：2024-09-26
申请号：US18733869
申请日：2024-06-05
申请人： Hunan University
发明人： He Xie , Yaonan Wang , Hui Zhang , Jianxu Mao
CPC分类号： B23Q17/22 , B23C3/12 , B23C2235/21 , B23Q2717/006
摘要： A workpiece and cutter pose calibration method based on robotic edge milling error tracking, including: 1. generating an edge milling trajectory point cloud; 2. obtaining an actual edge milling three-dimensional point cloud; 3. generating an updated edge milling three-dimensional point cloud; 4. calculating an edge milling allowance error and a posture inclination error; 5. solving position errors of the workpiece and cutter; 6. solving posture errors of the workpiece and cutter; 7. updating pose parameters of the workpiece and cutter; 8. repeating steps 4 to 7 until pose error vectors of the workpiece and cutter are both not greater than corresponding preset thresholds. The disclosure performs error comparison, error modeling, and error tracking on the three-dimensional point cloud and edge milling trajectory point cloud, even if the cutter has system errors such as axis deviation, the disclosure can accurately identify pose errors of the workpiece and cutter during edge milling.
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公开(公告)号：US11983472B2
公开(公告)日：2024-05-14
申请号：US18191149
申请日：2023-03-28
发明人： Chaoyang Chen , Yong Zhou , Zuguo Chen , Li He , Zhuangxi Tan , Pei Li , Ying Zou , Xiaowen Wu
IPC分类号： G06F30/20 , G06F113/04 , G06F119/02 , H02J3/00
CPC分类号： G06F30/20 , H02J3/00125 , G06F2113/04 , G06F2119/02 , H02J2203/20
摘要： Disclosed is a method for identifying fragile lines in power grid based on electrical betweenness, which comprises the following steps: constructing the power grid into a network diagram, sequentially removing lines in the network diagram, and sorting the electrical betweenness of each line from large to small; constructing a nonlinear model of complex network cascade failure considering overload and weighted edges, and respectively performing two ways of removing lines for sorted electrical betweenness, namely sequentially removing preset proportion lines and sequentially removing all lines until no new lines are removed in the network diagram; obtaining a change of generator-load power before and after each line removal, and evaluating a severity of power grid failure based on the change of generator-load power, thus completing an identification of power grid fragile lines.
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公开(公告)号：US11930080B1
公开(公告)日：2024-03-12
申请号：US18486693
申请日：2023-10-13
申请人： HUNAN UNIVERSITY
发明人： Hongbo Jiang , Zhu Xiao , Kehua Yang , Daibo Liu
IPC分类号： H04L67/12 , H04L67/568
CPC分类号： H04L67/12 , H04L67/568
摘要： The present application discloses a vehicle-mounted heterogeneous network collaborative task unloading method, which comprises the following steps: calculating a communication delay when a vehicle requests a cache from a smart lamp post for a vehicle terminal; taking the maximum communication delay in all the caches as the communication delay between the vehicle and the smart lamp post network, and determining whether the communication delay is less than the time when the vehicle sends a request to a cloud center, if so, unloading a task to the smart lamp post network, otherwise, unloading a task to the cloud center; taking profit of a single smart lamp post itself as an index for the smart lamp post terminal, dividing the smart lamp post network into a plurality of coalitions, taking the profit maximization of the coalition as an optimization objective, optimizing a smart lamp post combination in the coalition.
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公开(公告)号：US11906957B1
公开(公告)日：2024-02-20
申请号：US18223559
申请日：2023-07-19
申请人： HUNAN UNIVERSITY
发明人： Lipeng Zhu , Zhikang Shuai , Jiayong Li , Bin Zhou , Cong Zhang , Yuhan Hu , Weizhi Huang , Limengqian Zheng
CPC分类号： G05B23/0221 , H02J3/001 , G05B2223/06 , H02J2203/20
摘要： A method for assessing short-term voltage stability of a power grid based on synchronous spatio-temporal information learning includes: performing a time-domain simulation for each transient fault of a power grid under each operating mode, and extracting temporal response trajectories of each monitoring bus and stability status information of the power grid to obtain a transient sample set; constructing a spatial adjacency matrix and a temporal adjacency matrix separately, and integrating the spatial adjacency matrix and the temporal adjacency matrix into a spatio-temporal adjacency matrix; performing synchronous spatio-temporal information learning by using a graph convolutional neural network algorithm, and performing training to obtain a short-term voltage stability assessment model driven by spatio-temporal information synchronization; and inputting a transient temporal responsive trajectory obtained into the short-term voltage stability assessment model, to obtain an assessment result of short-term voltage stability of the power grid.
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公开(公告)号：US20230399910A1
公开(公告)日：2023-12-14
申请号：US18457150
申请日：2023-08-28
发明人： Yongping JIN , Zhaodong TONG , Youduo PENG
摘要： A drilling and sampling device applied to a seafloor tracked vehicle, including a slide seat, a positioning electromagnet, a pipe-replacing cylinder, a dial claw, a plurality of clamping assemblies, a plurality of sampling drill pipes, a drill pipe rack, a frame, a thrust cylinder, a pipe-releasing assembly, a guide rod, a drive pipe, a power head, and a pipe-replacing disc. The guide rod and the thrust cylinder are fixedly arranged on the frame. The slide seat is in clearance fit with the guide rod. A piston rod end of the thrust cylinder is hingedly connected to the slide seat. The power head is fixedly arranged on the slide seat. The drive pipe is arranged at an output end of the power head, and is coaxially screwed with the plurality of sampling drill pipes. The dial claw is slidably arranged in the arc guide groove.
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公开(公告)号：US11821961B2
公开(公告)日：2023-11-21
申请号：US18185429
申请日：2023-03-17
申请人： Hunan University
发明人： Bin Zhou , Ziqi Da , Zhikang Shuai , Lipeng Zhu , Cong Zhang , Jiayong Li , Yifang Jin
CPC分类号： G01R31/52 , G01R27/2605 , G06Q10/04 , G06Q50/06 , H02J3/381 , H02S50/10 , H02J2203/20 , H02J2300/24
摘要： A method for electricity-related security awareness of distributed power supply systems considering spatio-temporal distribution of rainstorms, including: establishing a multi-dimensional parallel parasitic capacitance calculation model of the distributed photovoltaic-energy storage power supply system considering accumulated water depth and micro-terrain environment; performing multi-source spatio-temporal hierarchical correlation analysis between rainstorm spatio-temporal distribution characteristics (including rainfall peak position, cloud movement, rainfall intensity and rainfall duration) and an operating state of the distributed power supply system; constructing a leakage current probability prediction model considering unevenness and randomness of the rainstorm spatio-temporal distribution; and establishing an electricity-related security awareness model based on deep meta-learning.
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78.发明公开公开(公告)号：US20230313390A1
公开(公告)日：2023-10-05
申请号：US18120544
申请日：2023-03-13
申请人： Hunan University
发明人： Binbin Huang , Xuxu Wang , Xiaojia Lei , Chao Lei
摘要： The present disclosure provides a method for generating ethylene by electrochemical selective hydrogenation of acetylene, including the following steps: continuously feeding acetylene gas into an organic solvent at a flow rate of 1 sccm to 50 sccm to obtain a solution; adding an electrolyte in the form of a solution or a solid such that the solution has an electrolyte concentration of 0.1 M to 3 M, a conductivity of 100 µs·cm-1 to 500 µs·cm-1, and a current density of 10 mA·cm-2 to 300 mA·cm-2; adding a hydrogen source such that the solution has a proton concentration of 0.1 M to 28 M; turning on an electrochemical treatment unit, and conducting constant-current or constant-potential electrolysis such that the acetylene gas is continuously and efficiently converted into ethylene gas after the electrolysis is stably conducted. The method has simple operations, low energy consumption, and quick response
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79.发明公开公开(公告)号：US20230273104A1
公开(公告)日：2023-08-31
申请号：US18314635
申请日：2023-05-09
发明人： Yongping JIN , Fenfei PENG , Deshun LIU
CPC分类号： G01N3/307 , G01N3/066 , G01N2203/0067 , G01N2203/0044 , G01N2203/001
摘要： A pre-tension and tensile impact test apparatus capable of simulating a full-sea-depth environment includes a pre-tensioning device, a Hopkinson bar device, a seawater pressure simulation device, a power source group and an acquisition control unit. The Hopkinson bar device includes an input rod, an air compressing device, a test sample and an output rod. The pre-tensioning device, the input rod, the air compressing device, the seawater pressure simulation device, the test sample and the output rod are successively arranged on the same axis. The air compressing device includes an air cylinder, an end cover and an impact piston. Two ends of the air cylinder are each provided with the end cover. The impact piston and the air cylinder are in clearance fit. The input rod is coaxially connected to the impact piston. Two ends of the input rod each extend out of the end cover.
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80.发明公开公开(公告)号：US20230273097A1
公开(公告)日：2023-08-31
申请号：US18314730
申请日：2023-05-09
发明人： Yongping JIN , Guangping LIU , Youduo PENG , Wenbo TANG , Ping LIU
IPC分类号： G01N1/04
CPC分类号： G01N1/04
摘要： A full-sea depth multi-point in-situ sampler includes a sampling assembly, a pressure-retaining assembly, a pressure-compensating assembly, and a cleaning assembly. The sampling assembly includes a handle, an extrusion valve, a needle valve core, a two-stage piston, a sampling tube, and a capturing device. The pressure-retaining assembly includes a pressure-retaining cylinder, a locking mechanism, a floating valve core, a support spring, and a drainage device. The pressure-compensating assembly includes a pressure-compensating cylinder, a piston, and an end cap. The cleaning assembly includes a cleaning sleeve, a cleaning cylinder, and multiple trigger mechanisms. A sampling and transfer method based on the sampler is also provided.
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