State Grid Corporation of China

Gansu Electric Power Corporation Wind Power Technology Center

Boe Technology Group Co., Ltd.

Tsinghua University

State Grid Gansu Eletric Power Corporation

State Grid Gansu Electric Power Corporation

Huawei Technologies Co., Limited

Beijing Boe Optoelectronics Technology Co., Ltd.

Beijing Boe Display Technology Co., Ltd.

North China Electric Power University

Wind Power Technology Center of Gansu Electric Power Company

Gansu Electric Power Company of State Grid

Economic and Technological Research Institute, State Grid Shandong Electric Power Company

Long Zhao

Qiang Zhou

Ningbo Wang

Yanhong Ma

Jin Li

Dan Jin

Liang Lu

Kun Ding

Shiyuan Zhou

Wenying Liu

Ming Ma

Rong Huang

Guangtu Liu

Dingmei Wang

Jianmei Zhang

Qingquan Lv

Rundong Ge

Jiaming Wang

Cai Liang

Peng Xu

Jian Zhang

Hui Zhao

Yuan Wang

Wei Zhu

Jian Wu

Ning Zhang

Qi Sun

Ziwei Cui

Bin Yang

Yunbao Zeng

Bo Li

Ning-Bo Wang

Luyang Wang

Qing-Quan Lv

Ying Qiao

Zong-Xiang Lu

Dan Wang

Xinlong Zhao

Zilan Zhao

Yan Wang

Jie Zhang

Xinming Duan

Xiaonan Gao

Jianing Zhang

Dong Liu

Duo Wang

Ying Mou

Yuhong Zhang

Shanjie Jia

Shien He

Xushan Han

Yi Zhu

Hongquan Xu

Xiaoyong Wang

Xiaohai Gao

Jinping Zhang

Xin Tian

Xin Wei

Jia Wei

Han Xiao

Xueliang Li

Yalong Li

Jing Wen

Xiaodan Wu

Xiaoming Liu

Chengyu Song

Zhijie Zheng

Chongru Liu

Yi Ding

Hong Mou

Jianchao Li

Zhongyi Liu

The present disclosure provides a method, an apparatus, and a medium for calculating capacities of a plurality of photovoltaic power stations. The method includes: receiving a plurality of historical weather data sets from the plurality of weather monitoring stations; determining a scene year based on the plurality of historical weather data sets; receiving an actual generating capacity of each photovoltaic power station predicted by a power system dispatch center; extracting weather data of each photovoltaic power station in the scene year from the corresponding historical weather data set; obtaining an available generating capacity of each photovoltaic power station in the scene year based on the weather data; and determining a capacity of each photovoltaic power station in the scene year according to the actual generating capacity and the available generating capacity of each photovoltaic power station.

Method, apparatus, and medium for calculating capacities of photovoltaic power stations

A tool configured for adjusting a plurality of pressing heads of an auxiliary welding machine and a method for operating the same are disclosed. The tool includes: a support; a limiting mechanism disposed on the support, wherein the limiting mechanism has a limiting groove for receiving a top end of at least one of the plurality of pressing head. It is possible to adjust the plurality of pressing heads of the auxiliary welding machine more conveniently and accurately using the above tool.

Tool for adjusting pressing heads of auxiliary welding machine and method for operating the same

The present invention discloses a preamble sequence generating method and device, which are used to avoid a problem, caused by damages to a preamble sequence resulting from interference in an NB-PLC system, that it is difficult for a receive end to correctly perform timing synchronization. The method includes: determining a quantity m of orthogonal frequency division multiplexing OFDM symbols that constitute a single pattern in a preamble sequence, where m is not less than 2; and generating a preamble sequence according to m, so that every m OFDM symbols that are in the generated preamble sequence and consecutive in a time domain constitute a single pattern, and the generated preamble sequence includes at least two patterns, where the patterns are different from each other. Embodiments of the present invention further provide a timing synchronization method and device.

Preamble sequence generating method, timing synchronization method, and device

The present invention discloses a maintenance schedule optimization method for an electric power system including large-scale wind power to build objective function to make it get optimal results, then constrain the objective function, constraint conditions include: constrain according to maintenance natural environment; constrain according to maintenance time of wind power plant; constrain according to maintenance site of wind power plant; constrain according to system reliability at wind power plant; constrain according to maintenance continuity of generator unit. Under the above constraint conditions, the electric power system is modeled with heuristic algorithm according to the above objective function. Through modeling the electric power system including large-scale wind power, optimize maintenance time of wind turbines in electric power system through modeling under a certain constraint conditions to maintain the wind power equipment properly while ensuring maximum efficiency of wind power generation at the same time.

Maintenance schedule optimization method for electric power system including large-scale wind power

The present invention discloses a testing method for dynamic model parameters of a wind power plant, wherein under testing conditions including stable running of wind turbine generators and reactive-load compensation equipment, stable wind speed between a cut-in wind speed and a rated wind speed, and the wind power plant output smaller than a rated output, finishes a wind speed transient disturbance test, a wind power plant unit tripping and inputting disturbance test, a wind power plant power change test, a disturbance test for reactive-load compensation equipment of the wind power plant, a tripping disturbance test for hydroelectric power plant and thermal power plant near the wind power plant and a manual single-phase ground short circuit test at the outgoing line part of the wind power plant, and records running curves of the wind power plant under each condition to finish the parameter test. The present invention realizes the advantage of providing precise measurement data for the stability analysis of an electric power system and the production dispatching of a power grid.

Method for testing dynamic model parameters of wind power plant

The present invention has disclosed an optimal control method for reactive voltage of wind power and photovoltaic power centralized grid connection in the field of wind power and photovoltaic power grid connection control technology, comprising: setting actuating stations used to control single wind power plant/photovoltaic power plant, setting substations used to control actuating stations and set master station used to control all the substations; master station calculates setting voltage reference Uof each substation; adopting 3&#x3c3; method to process set voltage reference Uto obtain set voltage reference interval; regulating high-side voltage of substation to make it fall in set voltage reference interval; if high-side voltage of substation does not fall in set voltage reference interval, then regulating the equipment in wind power plant/photovoltaic power plant via actuating station. The present invention guides the actual operations of electric power system.

Optimal control method for reactive voltage of wind power and photovoltaic power centralized grid connection

A method for improving system small disturbance stability after double-fed unit gets access to the system belongs to the field of electric power system operation and control technology. A sensitivity analysis is adopted to optimize parameter, through making sensitivity analysis on the non-ideal dominant mode happens to the system to find out several nonzero elements that are most sensitive to this mode in system matrix; elements of state matrix is adopted to replace the elements of system matrix to make analysis so as to find out the most relevant parameter set; setting parameters change in the interval to observe track for the change of eigenvalues of corresponding mode and then balancing and optimizing system parameters comprehensively according to the change of eigenvalues. Without adding other control means, the present invention can improve dominant modal damping caused by selecting improper controller parameters or system parameters after double-fed unit gets access to the system without increasing cost; as this method is also highly targeted, exhaustive efforts for all the adjustable parameters of the system can be avoided, which not only greatly decreases workload, but also improves computational efficiency, so that it is very instructive.

Method for improving small disturbance stability after double-fed unit gets access to the system

The present invention has disclosed a wind power bundling control method after wind power and thermal power are connected to a power grid in the field of electric power system security technology, including regulating wind power output and thermal power output forward or backward; calculating the transient stability margin of the grid, load level index of element and voltage out-of-limit index of busbar after regulating wind power output and thermal power output respectively; calculating wind power/thermal power paying value according to the transient stability margin of the grid, load level index of element and voltage out-of-limit index of busbar after regulating wind power output and thermal power output; if wind power/thermal power paying value is larger than set threshold value, regulating wind power output and thermal power output backward/forward; if wind power/thermal power paying value is smaller than set threshold value, regulating wind power output and thermal power output forward/backward. The present invention provides a wind power bundling control method after wind power and thermal power are connected to the power grid to ensure reasonable output of wind power and thermal power, so as to guarantee the power grid operates normally.

Wind power bundling control method after wind power and thermal power are connected to grid

Disclosed are a temperature compensation circuit for a display panel, a temperature compensation method and a liquid crystal display. The temperature compensation circuit comprises: a temperature detection unit configured to detect a variation in the temperature; a temperature conversion unit configured to convert the detected variation in the temperature into a voltage compensation value; and a compensation signal generation unit configured to process the voltage compensation value to generate a compensation signal. According to the embodiments of the present disclosure, the common electrode voltage of the display panel can be adjusted in real-time when the temperature varies, so that an amount of flickers presented on the display panel with an polarity inversion can be maintained at minimum, and thus a displaying of picture can be more stable and a visual experience of a viewer can be enhanced.

Temperature compensation circuit, temperature compensation method and liquid crystal display

A method of calculating available output power of wind farm includes following steps. A space vector Vis obtained by decomposing a power sequence of benchmarking wind turbines in a wind farm based on empirical orthogonal function. A typical power sequence of the benchmarking wind turbines is calculated by restoring the space vector V. A total power Pof a feeder on which the benchmarking wind turbines is operated is obtained by enlarging a typical power of each benchmarking wind turbine in proportion according to the quantity of the benchmarking wind turbines operated on the feeder. An output power Pof the wind farm is obtained by accumulating the total power Pof all the benchmarking wind turbines.

Method of calculating available output power of wind farm

Growing community of inventors

Lanzhou, China

Long Zhao