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31. 发明申请

US20220302706A1 BILATERAL STOCHASTIC POWER GRID DISPATCHING METHOD 有权
公开(公告)号：US20220302706A1
公开(公告)日：2022-09-22
申请号：US17383658
申请日：2021-07-23
申请人： Tsinghua University
发明人： Wenchuan WU , Shuwei XU , Boming ZHANG , Hongbin SUN , Bin WANG , Qinglai GUO
IPC分类号： H02J3/38 , G05B19/042
摘要： The disclosure relates to a two-side stochastic dispatching method for a power grid. By analyzing historical data of wind power, the Gaussian mixture distribution is fitted by software. For certain power system parameters, a two-side chance-constrained stochastic dispatching model is established. The hyperbolic tangent function is used to analyze and approximate cumulative distribution functions of random variables in the reserve demand constraint and the power flow constraint, to convert the two-side chance constraint into a deterministic constraint. The disclosure can have the advantage of using the hyperbolic tangent function to convert the two-side chance constraint containing risk levels and random variables into the solvable deterministic convex constraint, effectively improving the solution efficiency of the model, and providing decision makers with a more reasonable dispatching basis.

32. 发明申请

US20220255964A1 Stability criterion for time-delay of cyber-physical power systems under distributed control 有权
公开(公告)号：US20220255964A1
公开(公告)日：2022-08-11
申请号：US17328321
申请日：2021-05-24
申请人： Tsinghua University
发明人： Qinglai GUO , Hongbin SUN , Luo XU , Wenchuan WU
IPC分类号： H04L29/06
摘要： The present disclosure provides a stability criterion for time-delay of cyber-physical power systems under distributed control, which relates to a field of cyber-physical power systems technologies. The method first establishes an cyber side model of the cyber-physical power systems under distributed control and a physical power grid model of the cyber-physical power systems under distributed control respectively; then establishes simultaneous equations of the cyber side model and the physical power grid model to establish an unified differential algebraic equation model of the cyber-physical power systems under distributed control, so as to obtain a time-delay characteristic equation expression of the cyber-physical power systems under distributed control; determines a time-delay of each node, and solving the time-delay characteristic equation expression to obtain a maximum characteristic root, and performing the stability criterion for the time-delay of the cyber-physical power systems under distributed control according to a real part of the maximum characteristic root.

33. 发明申请

US20220114507A1 METHOD FOR OPTIMIZING TRANSFORMATION OF AUTOMATION EQUIPMENT IN A POWER DISTRIBUTION NETWORK BASED ON RELIABILITY CONSTRAINTS 有权
公开(公告)号：US20220114507A1
公开(公告)日：2022-04-14
申请号：US17555498
申请日：2021-12-19
申请人： Tsinghua University
发明人： Wenchuan WU , Boming ZHANG , Zihao LI , Hongbin SUN , Bin WANG , Qinglai GUO
IPC分类号： G06Q10/04 , G06Q50/06 , G05B19/042 , H02J3/00
摘要： The present disclosure provides a method for optimizing transformation of automation equipment in a power distribution network based on reliability, including determining installation states of respective components in the power distribution network and operation criterions for fault isolation, load transfer and fault recovery after a fault occurred in a feeder segment; determining a target function which is a target function for minimizing a total transformation cost of the power distribution network; determining constraint conditions including reliability constraints; establishing an optimization model for evaluating the reliability of the power distribution network based on the reliability constraints in accordance with the target function and the constraints; and solving the established optimization model for evaluating the reliability of the power distribution network based on the reliability constraints to obtain optimal solutions as optimization results of the automation transformation state of the circuit breaker and the switch and the reliability index.

34. 发明申请

US20200266631A1 STOCHASTIC DYNAMICAL UNIT COMMITMENT METHOD FOR POWER SYSTEM BASED ON SOLVING QUANTILES VIA NEWTON METHOD 审中-公开
公开(公告)号：US20200266631A1
公开(公告)日：2020-08-20
申请号：US16542651
申请日：2019-08-16
申请人： TSINGHUA UNIVERSITY , STATE GRID CORPORATION OF CHINA
发明人： Wenchuan WU , Bin WANG , Mingjie LI , Hongbin SUN , Qinglai GUO , Yue YANG , Shuwei XU
IPC分类号： H02J3/38 , G05B17/02
摘要： The disclosure provides a stochastic dynamical unit commitment method for power system based on solving quantiles via Newton method, belonging to power system technologies. The method establishes a unit commitment model with chance constraints for power system parameters. Quantiles of random variables obeying mixed Gaussian distribution is solved by Newton method, and chance constraints are transformed into deterministic linear constraints, so that original problem is transformed into mixed integer linear optimization problem. Finally, the model is solved to obtain on-off strategy and active power plan of units. The disclosure employs Newton method to transform chance constraints containing risk level and random variables into deterministic mixed integer linear constraints, which effectively improves the model solution efficiency, eliminates conservative nature of conventional robust unit commitment, provides reasonable dispatch basis for decision makers. The disclosure is employed to the stochastic and dynamic unit commitment of the power system including large-scale renewable energy grid-connected.

35. 发明申请

US20190056704A1 METHOD AND DEVICE FOR SOLVING OPTIMAL POWER FLOW IN POWER SUPPLY SYSTEM, AND STORAGE MEDIUM 审中-公开
公开(公告)号：US20190056704A1
公开(公告)日：2019-02-21
申请号：US15853017
申请日：2017-12-22
申请人： Tsinghua University
发明人： Wenchuan WU , Boming ZHANG , Hongbin SUN
IPC分类号： G05B17/02
摘要： The present disclosure provides a method and a device for solving an optimal power flow in a power supply system. A second convex model of the optimal power flow is established. A relaxation variant sum e according to the second convex model is determined. It is judged whether the relaxation variant sum e is greater than a preset threshold. If the relaxation variant sum e is greater than the preset threshold, the second convex model of the optimal power flow is established. If the relaxation variant sum e is not greater than the preset threshold, the solution of the second convex optimal model is determined as a feasible solution of the optimal model of the optimal power flow.

36. 发明申请

US20170220521A1 METHOD AND DEVICE FOR ESTIMATING STATE OF POWER SYSTEM 审中-公开
公开(公告)号：US20170220521A1
公开(公告)日：2017-08-03
申请号：US15331876
申请日：2016-10-23
申请人： Tsinghua University
发明人： Wenchuan WU , Boming ZHANG , Hongbin SUN , Weiye ZHENG , Qinglai GUO , Bin WANG
IPC分类号： G06F17/12 , G05F1/66
CPC分类号： G05F1/66 , G05B23/02 , G06F17/11
摘要： A method and a device for estimating a state of a power system are provided. The method includes: dividing the power system into a plurality of sub-systems; establishing a first linear model of the power system for a first stage; solving the first linear model by an alternating direction multiplier method to obtain the intermediate state variables of each sub-system; performing a nonlinear transformation at a second stage on the intermediate state variables to obtain intermediate measured values; establishing a second linear model of the power system for a third stage according to the intermediate measured values; and solving the third linear model by the alternating direction multiplier method to obtain the final state variables of each sub-system.

37. 发明申请

US20140222227A1 METHOD FOR CALCULATING CONTINUATION POWER FLOW OF ELECTRIC POWER SYSTEM 有权
标题翻译：计算电力系统连续流量的方法
公开(公告)号：US20140222227A1
公开(公告)日：2014-08-07
申请号：US14174114
申请日：2014-02-06
申请人： Tsinghua University
发明人： Wenchuan WU , Boming ZHANG , Hongbin SUN , Qinglai GUO , Yuntao JU
IPC分类号： G05B15/02
CPC分类号： H02J3/06
摘要： A method for obtaining a continuous power flow of an electric power system is provided. The method comprises: establishing first power flow equations for PQ buses, and establishing second power flow equations for PV buses; establishing power flow equations according to the first flow equations, the second power flow equations, and a voltage magnitude and a voltage phase of a balance bus; choosing a bus having a fastest voltage drop as a parameterization bus, and defining a parameterization variable according to a voltage magnitude of the parameterization bus and the load growth factor; defining an equality constraint equation according to the parameterization variable, and generating an extended power flow equation according to the equality constraint equation and the power flow equations; solving the extended power flow equation by a plurality of iterations to obtain a plurality of load summations; generating a P-V curve according to the plurality of load summations.
摘要翻译：提供一种用于获得电力系统的连续动力流的方法。该方法包括：为PQ总线建立第一功率流方程，并为PV总线建立第二功率流方程; 根据第一流量方程，第二功率流方程以及平衡母线的电压幅度和电压相位建立功率流方程; 选择具有最快电压降的总线作为参数化总线，并根据参数化总线的电压幅值和负载增长因子定义参数化变量; 根据参数化变量定义等式约束方程，并根据等式约束方程和功率流方程生成扩展功率流方程; 通过多次迭代求解扩展功率流方程以获得多个负载求和; 根据多个负载求和产生P-V曲线。

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