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1.发明公开公开(公告)号：US20230369852A1
公开(公告)日：2023-11-16
申请号：US18029973
申请日：2022-04-09
申请人： Southeast University , ELECTRIC POWER RESEARCH INSTITUTE OF YUNNAN POWER GRID CO., LTD. , YUNNAN POWER GRID CO., LTD.
发明人： Pengxiang LIU , Zhi WU , Hai LU , Wei GU , Yuping LU , Enbo LUO , Dada WANG , Qirun SUN , Hao ZHANG
IPC分类号： H02J3/00
CPC分类号： H02J3/00 , H02J2203/20
摘要： A method for calculating an optimal energy flow of an integrated electricity-gas system comprises: a convex optimization part of an optimal energy flow model is established according to a fuel cost of each thermal power unit node and a gas supply cost of each nature gas source node, and a convex relaxation formula of a quadratic constraint of the optimal energy flow model is established, and a convex function is expanded by a first order Taylor expansion at a relaxation solution to form an expansion formula; a precision requirement threshold value of a non-convex constraint is given, the threshold value is compared with an unbalance magnitude of a non-convex constraint in the expansion formula; when the unbalance magnitude is greater than the threshold value, the expansion is iterated into a solution model of the integrated electricity-gas hybrid energy system until the unbalance magnitude is not greater than the threshold value.
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2.发明公开公开(公告)号：US20230361552A1
公开(公告)日：2023-11-09
申请号：US18181482
申请日：2023-03-09
发明人： Hongwen Liu , Xianping Zhao , Jindong Yang , Chenchao Chai , Lijun Tang , Ding Nie , Quancong Zhu , Yongjie Nie , Dexu Zou , Shaolei Zhai , Zhilei Zhang
摘要： The embodiments of the present invention disclose a line protection method and a related apparatus for a flexible grounding system of a power distribution network. The method comprises outputting a first compensation voltage by a voltage source of a flexible grounding device of each line of a target power distribution network in the case where a ground fault occurs in the target power distribution network; starting to calculate the zero-sequence impedance of each line in real time by the zero-sequence impedance protection device; after the first compensation voltage is output for a first output duration, outputting a second compensation voltage; calculating the zero-sequence impedance of each line in real time by the line zero-sequence impedance protection device; determining a fault line by the zero-sequence impedance protection device, and cutting off the fault line to isolate the ground fault after a trip for a preset time delay.
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公开(公告)号：US20230280388A1
公开(公告)日：2023-09-07
申请号：US18184674
申请日：2023-03-16
发明人： Hongwen Liu , Xianping Zhao , Jindong Yang , Chenchao Chai , Lijun Tang , Ding Nie , Quancong Zhu , Yongjie Nie , Dexu Zou , Shaolei Zhai , Zhilei Zhang
IPC分类号： G01R31/08
CPC分类号： G01R31/086
摘要： The embodiments of the present invention disclose a method and a related device for locating a ring power network fault. The method comprises: expanding in each ring line segment with an arbitrary point as a coordinate origin in a ring power network to construct a plurality of reference coordinate systems; acquiring monitoring point coordinate information and wavehead arrival time information of each of the monitoring point positions; acquiring assumed fault point information; acquiring a traveling wave propagation speed; constructing a plurality of distributed fault location equation sets according to the monitoring point coordinate information, the wavehead arrival time information, the assumed fault point information and the traveling wave propagation speed in each of the reference coordinate systems; and determining an actual fault position according to a solution result of each of the distributed fault location equation sets and the assumed fault section.
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公开(公告)号：US20240303391A1
公开(公告)日：2024-09-12
申请号：US18552284
申请日：2022-10-27
发明人： Wei GU , Suhan ZHANG , Hai LU , Enbo LUO
IPC分类号： G06F30/20
CPC分类号： G06F30/20
摘要： Disclosed is a method for constructing a security region of an integrated electricity and heating system, falling into the field of energy system modeling and operational analysis. The method specifically includes: establishing a dynamic model of the integrated electricity and heating system, including a power system model, a quality-regulated heating system dynamic model, and a combined heat and power unit dynamic model; constructing, in combination with operational security constraints, a security region model of the integrated electricity and heating system considering thermal dynamics; and solving, aiming at nonlinear and nonconvex characteristics of the security region of the integrated electricity and heating system, a security region boundary by an optimization-check-based concave hull method. Compared with the related art, the method considers thermal dynamics in the integrated electricity and heating system, and accurately depicts operational features. Limited operation points are solved through the optimization-check-based concave hull method, thus guaranteeing security.
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5.发明公开公开(公告)号：US20230280386A1
公开(公告)日：2023-09-07
申请号：US18176486
申请日：2023-03-01
发明人： Hongwen Liu , Xiangjun Zeng , Jindong Yang , Hao Bai , Ding Nie , Jisheng Huang , Lijun Tang , Guochao Qian , Dexu Zou , Xincui Tian
IPC分类号： G01R31/08
CPC分类号： G01R31/085 , G01R31/088
摘要： A method and a system for locating a fault of a complex power line are provided. Several monitoring points on the complex power line can be obtained by providing several traveling wave head monitoring sensors on the complex power line. The complex power line is transformed into coordinates in conjunction with an arrival moment and a location corresponding to the monitoring points, thereby establishing a trunk line fault-locating equation related to a line location, the arrival moment, and a traveling wave propagation speed, from which a first fault point can thus be derived simply and quickly. If a fault point is located on a branch line, a branch line fault-locating equation is then established to derive a second fault point. Furthermore, the first fault point and the second fault point serve as a basis for deriving a target fault point of the complex power line.
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