Abstract: An alarm tone adjustment circuit includes a sound collection unit with a function of collecting sound of a surrounding environment, an analog-digital (A/D) convertor, and a processing unit. The A/D convertor transforms the sound of a surrounding environment from the sound collection unit to a digital signal. The processing unit is coupled to the A/D convertor and an alarm tone unit, and determines a decibel range of the sound of surrounding environment according to a duty cycle of the digital signal, and adjusts a volume of a ring output from the alarm tone unit according to the decibel range of the sound of surrounding environment. Therefore, the alarm tone of the electronic device can be changed effectively according to the sound of surrounding environment.

Abstract: A method of calculating available output power of wind farm includes following steps. A space vector Vk is 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 Vk. A total power Ptotal of 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 Pestimate of the wind farm is obtained by accumulating the total power Ptotal of all the benchmarking wind turbines.

Abstract: Disclosed is a method for modeling a medium and long term wind power output model optimally operating in a medium and long term in a power system.

Abstract: In embodiments of device proximity detection implemented in hardware, a computing device, such as a mobile phone, appliance device, or other electronic device can be implemented with wireless radio systems for wireless communications, and a wireless radio system receives a wireless signal. A computing device includes a radio controller of the wireless radio system, and the radio controller is implemented to detect an indication associated with the wireless signal, such as a byte pattern in the wireless signal and/or a signal strength of the signal. The radio controller can then determine that the indication of the wireless signal identifies the wireless signal as pertinent to an application executing on the computing device, and communicate an event notice to a signal manager that the wireless signal has been identified. The radio controller communicates event notices via a hardware interface that is implemented to interface the radio controller with the signal manager.

Abstract: A method for managing a plurality of files in a communication network having a plurality of clients includes a server receiving (502) metadata associated with a secured file stored in a virtual data drive of a first client. The server also receives (504) data segments associated with the file from the virtual data drive of the first client. The server stores the metadata and data segments associated with the file at the server. The server generates (506) a first representation of the file based on the received metadata and data segments associated with the file and sends (508) the first representation of the file to the plurality of clients. Next, the server receives (510) a request from a second client for at least one data segment of the file. The server authenticates the request based on a plurality of access rights of a user of the second client and sends (512) the at least one data segment of the file to the second client when the request is authenticated.

Abstract: A method of calculating theoretical power of wind farm based on extrapolation of anemometer tower data includes following steps. A number of anemometer towers in a wind farm is selected, and analyzing historical data acquired by the number of anemometer towers. An air density is calculated based on the historical data of the number of anemometer towers. A power curve is calibrated based on the historical data of the number of anemometer towers. The power curve is fit based on a wind speed and a wind power of a fan head of each wind turbine based on the historical data. An theoretical power calculation extrapolation model of anemometer tower data is constructed. Real-time anemometer tower wind data and a calibrated air density are inputted into the theoretical power calculation model and calculating the wind power. The theoretical power is obtained.

Abstract: A method of computing theoretical power of wind farm based on sample wind turbine method. Historical real-time measured output data of sample wind turbines in the wind farm is statistically analyzed. A theoretical output of the sample wind turbines is analyzed based on a wind power output characteristic and a theoretical output design curve of wind turbine. A theoretical power calculation model of wind farm is constructed based on the historical real-time measured output data of sample wind turbines. A number of wind turbines actually running in real-time is obtained based on real-time information data of wind turbines in the wind farm. An actual operation data of the sample wind turbines is confirmed. The actual operation data is input into the theoretical power calculation model of wind farm. Real-time data of theoretical power of wind farm is output, and an actual operation result of wind farm is comparatively analyzed.

Abstract: An approach to assess available wind resource distribution based on interpolation method includes following steps. A correlation coefficient is obtained between each two of a number of anemometer towers, and a number of first groups are formed by grouping the anemometer towers for the first time with the shortest distance clustering method. A number of second groups are obtained by grouping the plurality of anemometer towers in each of the first groups for the second time, wherein anemometer towers are grouped with absolute value of differences of mean wind velocity between each two of the anemometer towers. A number of values of wind velocity and wind direction at an target point are obtained through at least two anemometer towers in one of the second groups by the inverse distance weighting method, wherein the at least two anemometer towers are nearest to the target point.

Abstract: 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 Uref of each substation; adopting 3? method to process set voltage reference Uref to 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.

Abstract: 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.

Abstract: A method of calculating available output power of wind farm includes following steps. A space vector Vk is 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 Vk. A total power Ptotal of 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 Pestimate of the wind farm is obtained by accumulating the total power Ptotal of all the benchmarking wind turbines.

Abstract: 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.

Abstract: A recovery circuit for a basic input-output system (BIOS) of a computer includes a storage, a platform controller hub (PCH), and a processor. An effective chip select signal is received by a chip selection pin of the storage via a second pin of the processor when a first pin of the processor does not receive any signals, data in the processor is transmitted to the PCH to make the computer boot up, the data in the processor is transmitted to the storage to erase and update data in the storage.

Abstract: 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.

Abstract: A method of analyzing wake flow of wind turbine based on multiple wake flow models includes following steps. A number of wake flow model are analyzed. A number of wake flow turbulence models are analyzed based on analysis results of the wake flow models. A number of wake flow combined models are analyzed based on the analysis results of the wake flow turbulence models, and the wind turbine wake flow analysis results of all the wake flow models, wake flow turbulence modes, and wake flow combine models are obtained.

Abstract: A method of dividing irradiance regions based on rotated empirical orthogonal function includes following steps. A standardized matrix averaging on annual total radiation amount data is performed. An empirical orthogonal function decomposition on an annual total radiation variable field matrix is performed based on the standardized matrix averaging result of the annual total radiation amount data. A variance contribution rate and an accumulative variance contribution rate are calculated by rotating a load matrix and a factor matrix according to a varimax orthogonal rotation principle based on the empirical orthogonal function decomposition result of the annual total radiation variable field matrix. The irradiance regions are divided according to results of the variance contribution rate and the accumulative variance contribution rate.

Abstract: A power-saving circuit for a computer that includes a host and a monitor, the power-saving circuit includes a sensing module and a control module. The sensing module is configured to detect whether an external object in vicinity of the monitor is absent from the vicinity of the monitor, and output a corresponding detecting signal in response to detecting that the external object is absent. The control module includes a controller electronically coupled to the sensing module, the host and the monitor. The controller is configured to calculate a time period of the absence of the external object according to the detecting signal, and control the host and monitor to proceed into different power modes according to the time period.

Abstract: A method for managing a plurality of files in a communication network having a plurality of clients includes a server receiving (502) metadata associated with a secured file stored in a virtual data drive of a first client. The server also receives (504) data segments associated with the file from the virtual data drive of the first client. The server stores the metadata and data segments associated with the file at the server. The server generates (506) a first representation of the file based on the received metadata and data segments associated with the file and sends (508) the first representation of the file to the plurality of clients. Next, the server receives (510) a request from a second client for at least one data segment of the file. The server authenticates the request based on a plurality of access rights of a user of the second client and sends (512) the at least one data segment of the file to the second client when the request is authenticated.

Abstract: A brightness adjusting circuit is coupled to a display. The brightness adjusting circuit includes an acquisition module, a conversion module, a control module, and a processing module. The conversion module is connected to the acquisition module. The control module is connected to the conversion module. The processing module is connected to the control module and the conversion module. The display receives brightness signals outputted from the processing module and adjusts the brightness of the display.

Abstract: An ultra-short-term forecasting method including real-time monitoring of the effect of upper and lower courses, comprising: obtaining ultra-short-term model forecast results through the model lattices based on the T639 global spectral model course library data source, the CALMET wind field diagnostic model and static data; establishing statistical equations on the effect of upper and lower courses between the corresponding reference index station and each target wind tower for obtaining the effect of upper and lower courses of the target wind towers based on the wind tower database of the target wind power base and combined with the wind direction and speed real-time monitoring data of the reference index stations in the upper and lower courses, forecasting the ultra-short-term wind speed changes of each target wind tower and correct combined with the ultra-short-term model forecast results to form forecasting of the ultra-short-term wind speed changes of the wind towers in the target wind power base; after r