Abstract: A computer-implemented method for determining a grid stability of an electrical energy grid. A communication device receives a dataset with parameters for components of the electrical energy grid and a model generation device generates a root-mean-square model and an electromagnetic transient model based on the parameters. Then a performance device calculates a respective performance property for the root-mean-square model and the electromagnetic transient model and a difference value is determined between the two performance properties by an assessment device. When the difference value exceeds a difference threshold value, the electromagnetic transient model is selected. Otherwise the root-mean-square model is selected. There is also described a corresponding arrangement and a corresponding computer program product.

Abstract: A method and a device for the mutual monitoring and/or control of a multiplicity of autonomous technical systems which are at least partially interconnected to one another via a communication network is provided. At least one of the autonomous technical systems is embodied as a monitoring autonomous technical system and monitors the operating behaviour of other autonomous technical systems. Since a specified first rule, the monitoring autonomous technical system detects an operating behavior, which is contrary to the rule, of a first autonomous technical system and generates a status message about the operating behavior which is contrary to the rule therefrom. Depending on the evaluation, a control rule is derived for the first autonomous technical system and communicated to a control module which is assigned to the first autonomous technical system. The operating behavior of the first autonomous technical system is controlled on the basis of the control rule.

Abstract: A computer-implemented method, computer-implemented tool and power plant control device for energy balancing solar power plants and a solar power plant system is provided.

Abstract: In order to estimate states of health of batteries storing electrical energy significantly indicated by battery capacity and battery internal resistance, by which the estimation of states of health of batteries, deteriorated over time usage, is automated and carried out without a need of any specific test such as a capacity test and the usage of data out of normal operation, it is proposed to collect data from normal operation of a battery storing electrical energy relating to battery-internal physical properties such as a terminal direct current IDC, a terminal direct voltage UDV and a battery cell temperature T due to battery measurements and the determination or estimation, based on this data and a battery model, of a model parameter by solving an optimization-/model parameter estimation-problem and minimizing a difference between the battery model and the battery measurements.

Abstract: In order to detect power production degradation of a solar power plant (SPP) with at least one photovoltaic module (PVM), by which the detection of power production degradation, affected for instance by long term aging or soiling of the photovoltaic module of the solar power plant, is automated and carried out sensorless, it is proposed to determine the degradation by calibrating local measurements of data related to module/plant-internal parameters (PT) such as irradiance I and temperature T or electric power P and temperature as measurement data (MDI,ti, MDT,ti, MDP,ti against irradiance reference data (RDI,ti) for instance satellite data in the form of weather data for the same time and then analyze a variation of the calibration.

Abstract: In order to estimate states of health of batteries storing electrical energy significantly indicated by battery capacity and battery internal resistance, by which the estimation of states of health of batteries, deteriorated over time usage, is automated and carried out without a need of any specific test such as a capacity test and the usage of data out of normal operation, it is proposed to collect data from normal operation of a battery storing electrical energy relating to battery-internal physical properties such as a terminal direct current IDC, a terminal direct voltage UDV and a battery cell temperature T due to battery measurements and the determination or estimation, based on this data and a battery model, of a model parameter by solving an optimization-/model parameter estimation-problem and minimizing a difference between the battery model and the battery measurements.

Abstract: To control a power network having a photovoltaic system, a time curve of a light radiation of the photovoltaic system is determined, wherein an increase of the time curve in relation to a reference curve of the light radiation is detected. As a result of the detection of the increase, a preparatory measure is then introduced to prepare the power network for an upcoming power drop of the photovoltaic system.

Abstract: Various embodiments include a method for determining a design of an energy system comprising: providing a plurality of values of a parameter of an optimization method using an extraction of the values according to a probability distribution of the parameter; specifying a respective single-target function of the energy system for each of the plurality of values; forming an overall target function using the single-target functions; and extremizing the overall target function using the optimization method.

Abstract: Pixels are classified within a time series of first and second images for the first image, a first probability map is provided with a first probability for a cloud for each first pixel and, for the second image, a second probability map with a second probability for a cloud for each second pixel; first and second mean intensity values are calculated for the pixels; local zero mean images are calculated by subtracting the mean intensity value from the intensity value of the respective pixel; a maximum difference map is generated by calculating, for spatially corresponding pixels, an absolute difference value between a first and second zero mean value; a weighting map is produced by multiplying each absolute difference value with a non-linear function; and a classifying map is computed based on the first probability map, the second probability map, and the weighting map.

Abstract: A method of classifying a near sun sky image includes at least one of the following steps: providing a recurrent neural network in the shape of a long short-term memory cell, the memory cell having at least an input gate, a neuron with a self-recurrent connection, a forget gate, and an output gate, and using a convolutional neural network, which includes, in the cited order, at least an input layer, one or more convolutional layers, an average pooling layer, and an output layer.

Abstract: A method and a device for the mutual monitoring and/or control of a multiplicity of autonomous technical systems which are at least partially interconnected to one another via a communication network is provided. At least one of the autonomous technical systems is embodied as a monitoring autonomous technical system and monitors the operating behaviour of other autonomous technical systems. Since a specified first rule, the monitoring autonomous technical system detects an operating behavior, which is contrary to the rule, of a first autonomous technical system and generates a status message about the operating behavior which is contrary to the rule therefrom. Depending on the evaluation, a control rule is derived for the first autonomous technical system and communicated to a control module which is assigned to the first autonomous technical system. The operating behavior of the first autonomous technical system is controlled on the basis of the control rule.

Abstract: To control a power network having a photovoltaic system, a time curve of a light radiation of the photovoltaic system is determined, wherein an increase of the time curve in relation to a reference curve of the light radiation is detected. As a result of the detection of the increase, a preparatory measure is then introduced to prepare the power network for an upcoming power drop of the photovoltaic system.

Abstract: A control unit includes a power supply device with a battery store including at least one battery unit; a first energy conversion device that converts nonelectrical energy into electrical energy; and a connecting unit configured such that a summed energy for the electrical energy of the energy conversion device and battery store is deliverable. The control unit receives an instantaneous output power or a future output power requirement of the first energy conversion device and further receives a predicted power of the first energy conversion device for at least one future time. The instantaneous output power or the future output power requirement and the predicted power are used to ascertain a required power at the future time. At least one battery unit is switched on in response to the threshold value being exceeded by the required power.

Abstract: A short-term cloud forecasting system includes a cloud segmentation processor that receives image data from images captured by an all sky camera. The cloud segmentation processor calculates a probability for each pixel in an image that the pixel is representative of a cloud. A cloud motion estimation processor calculates a motion vector representing estimated cloud motion calculates weights representing the likelihood that the cloud motion will cause a cloud to occlude the sun at a time in the near future. An uncertainty processor calculates one or more uncertainty indexes that quantify the confidence that a cloud forecast is accurate. Combining the cloud probabilities, the global motion vector and the at least one uncertainty index, in a sun occlusion prediction processor produces a short-term cloud forecast based on the image data that may be used as input to control systems for controlling a power grid.

Abstract: A method for estimating grid properties of a power grid coupled to a generator at a point of common coupling is provided. First, a voltage VPCC at the point of common coupling is measured. Second, a current IPCC at the point of common coupling is measured. Third, the grid properties are estimated by a grid model using as input parameters the measured voltage VPCC at the point of common coupling, the measured current IPCC at the point of common coupling and the determined phase angle. Advantageously, the absolute phases of the voltage and the current at the point of common coupling are not necessary, which makes the present method less prone to errors due to measurement noise. Further, a device and a computer program product are provided.

Abstract: A short-term cloud forecasting system includes a cloud segmentation processor that receives image data from images captured by an all sky camera. The cloud segmentation processor calculates a probability for each pixel in an image that the pixel is representative of a cloud. A cloud motion estimation processor calculates a motion vector representing estimated cloud motion calculates weights representing the likelihood that the cloud motion will cause a cloud to occlude the sun at a time in the near future. An uncertainty processor calculates one or more uncertainty indexes that quantify the confidence that a cloud forecast is accurate. Combining the cloud probabilities, the global motion vector and the at least one uncertainty index, in a sun occlusion prediction processor produces a short-term cloud forecast based on the image data that may be used as input to control systems for controlling a power grid.

Abstract: A control unit includes a power supply device with a battery store including at least one battery unit; a first energy conversion device that converts nonelectrical energy into electrical energy; and a connecting unit configured such that a summed energy for the electrical energy of the energy conversion device and battery store is deliverable. The control unit receives an instantaneous output power or a future output power requirement of the first energy conversion device and further receives a predicted power of the first energy conversion device for at least one future time. The instantaneous output power or the future output power requirement and the predicted power are used to ascertain a required power at the future time. At least one battery unit is switched on in response to the threshold value being exceeded by the required power.

Abstract: A wind turbine controller for controlling power production of a wind turbine is provided. The wind turbine is arranged within a wind farm coupled to a public power network via a point of common coupling. The wind turbine controller has a receiving unit for receiving a measured value of a property of the wind farm taken at the point of common coupling and for receiving a reference value for the property, and a control unit for controlling the power production of the wind turbine by regulating a local property of the wind turbine based on the received measured value and the received reference value such that the measured value of the wind farm taken at the point of common coupling corresponds to the reference value. Further, a wind turbine having such a controller, a wind farm and a method for controlling a power production of a wind turbine are provided.

Abstract: A method for controlling an electrical energy distribution network in which electrical power is provided via network nodes connected via power lines is provided. A portion of the network nodes are controllable network nodes with respective local controllers, and at least a portion of the controllable network nodes are energy generators. The energy distribution network is coupled to an energy transmission network at a point of common coupling and provides electrical power to the energy transmission network at the point of common coupling. The electrical power originates from the controllable network nodes. A central controller communicates with the local controllers and the energy transmission network. The central controller controls the energy distribution network with the aid of the communication with the local controllers and the energy transmission network such that at the point of common coupling, primary control power and short-circuit power are kept available for the energy transmission network.

Abstract: A method for signaling and controlling in a power grid coupling a plurality of actuators for providing power signals is provided. At a first actuator, a voltage problem is detected, a communication signal is generated based on the detected voltage problem, and the generated communication signal is transmitted over the power grid. At a second actuator, the transmitted communication signal is received, a control action is generated based on the received communication signal and the generated control action is transmitted over the power grid towards the first actuator.