Machine Learning Techniques for the Smart Grid Modeling of Solar Energy using AI
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1 Machine Learning Techniques for the Smart Grid Modeling of Solar Energy using AI Professor Dr. Wilfried Elmenreich Dr. Tamer Khatib Networked and Embedded Systems
2 Overview Scope of this tutorial Meta-heuristic search algorithms Artificial neural networks Modeling of solar radiation Modeling extraterrestrial and terrestrial solar radiation Clear sky model Satellite based models Sky transmittance-based models Ground meteorological measurement based model ANN Based modeling of solar radiation
3 Artificial Intelligence Areas Automated planning and scheduling Machine learning Natural language processing Perception Robotics Social intelligence Creativity Artificial general intelligence
4 Artificial Intelligence Techniques Automated planning and scheduling Machine learning Natural language processing Perception Robotics Social intelligence Creativity Artificial general intelligence
5 PART I Metaheuristic search algorithms
6 Meta-heuristic search algorithms For optimization problems Etymology: Meta upper level Heuristic to find Heuristic = deterministic Meta-heuristic = utilizing randomization in search So it is only for search problems? Every engineering or design challenges can be formulated into a search problem over a solution space Solution space can be particular large and multi-dimensional Standard optimization algorithms don t finish in acceptable time Need for meta-heuristic
7 Overview on Search Techniques Metaheuristics = Guided random search techniques
8 Properties of Meta-heuristic Search Algorithms Metaheuristics are strategies that guide the search process Goal is to efficiently explore the search space to find (near-)optimal solutions No single technique Metaheuristic algorithms are approximate and typically non-deterministic Metaheuristic algorithms might fail by getting trapped in confined and deceptive areas of the search space Metaheuristics are typically not problem-specific
9 Meta-heuristic Search Algorithms (1) x 2 x 3 X 4 x 1 X 5 Trajectory methods Basic Idea: Iterative improvement Simulated annealing (Scott Kirkpatrick, C. Daniel Gelatt and Mario P. Vecchi, 1983) Tabu search (Fred Glover, 1986) Variable neighborhood search (Mladenovic, Hansen, 1997)
10 Meta-heuristic Search Algorithms (2) Population-based methods Genetic algorithm (John Holland 1975) Evolutionary algorithms Genetic programming (Fogel 1964) Swarm Algorithms
11 Evolutionary Algorithm
12 Searching for Rules Simulation of target system as playground Evolvable model of local behavior (e.g., fuzzy rules, ANN) Define goal via fitness function (e.g., maximize throughput in a network) Run evolutionary algorithm to derive local rules that fulfill the given goal Explore solutions Evaluate & Iterate System model Goals (fitness function) Simulation Analyze results
13 Wilfried Elmenreich System architecture 6 major components: task description, simulation setup, interaction interface, evolvable decision unit, objective function, search algorithm Building Self-Organizing Systems 13
14 Agent behavior to be evolved Controls the agents of the SOS Processes inputs (from sensors) and produces output (to actuators) Must be evolvable Mutation Recombination Agent Control System Agent s Brain We cannot easily do this with an algorithm represented in C code
15 Artificial Neural Networks Each neuron sums up the weighted outputs of the other connected neurons The output of the neuron is the result of an activation function (e.g. step, sigmoid function) applied to this sum Neural networks are distinguished by their connection structure Feed forward connections (layered) Recursive (Ouput neurons feed back to input layer) Fully meshed
16 Evolving Neural Networks Recomb ination Mutation
17 Framework for Evolutionary Design FREVO (Framework for Evolutionary Design) Modular Java tool allowing fast simulation and evolution FREVO defines flexible components for Controller representation Problem specification Optimizer
18 Giving FREVO a Problem Basically, we need a simulation of the problem Interface for input/output connections to the agents E.g. for the public goods game: Your input last round Your revenue Feedback from a simulation run -> fitness value FREVO source code and simple tutorial for a new problem at
19 PART II Modeling of solar radiation
20 Application example Modeling of solar radiation Modeling extraterrestrial and terrestrial solar radiation Clear sky model Satellite based models Sky transmittance-based models Ground meteorological measurement based model ANN Based modeling of solar radiation
21 Preface: Solar energy Solar energy is part of the sun s energy which falls at the earth s surface. It can be harnessed, to heat water or to move electrons in a solar cell. Solar radiation data provide information on sun s potential in a specific location. These data are very important for designing solar energy systems. Due to the high cost and installation difficulties in measuring devices, these data aren't always available. thus, alternative prediction ways are needed.
22 How big is solar energy? Source: Boyle, G Renewable Energy. OXFORD..
23 Modeling of extraterrestrial solar radiation The Sun emits radiant energy in an amount that is a function of its temperature. Blackbody model can be used to describe how much radiation the sun emits. A blackbody is defined to be a perfect emitter as well as a perfect absorber The wavelengths emitted by a blackbody depend on its temperature as described by Planck s law: E λ = λt 1 ] λ 5 [e Where, Eλ is the emissive power per area (W/m2 μm), T is the absolute temperature of the body (K), λ is the wavelength (μm).
24 Modeling of extraterrestrial solar radiation To calculate the daily extraterrestrial solar radiation on the top of the atmosphere, the path that the earth rotates around the sun must be considered. The eccentricity of the ellipse is small and the orbit is, in fact, quite nearly circular. Therefore, the extraterrestrial solar radiation in W/m2 can be described as, where Rav is the mean sun-earth distance I o = 1367 R av R R is the actual sun-earth distance depending on the day of the year After all, the daily extraterrestrial solar radiation can be given as follows, I o = 1367[ cos 360n 365 ] 2
25 Modeling of terrestrial solar radiation Attenuation of incoming radiation is a function of the distance that the beam has to travel through the atmosphere, which is easily calculable, as well as factors such as dust, air pollution, atmospheric water vapor, clouds, and turbidity
26 Modeling of terrestrial solar radiation There are many theories for modeling terrestrial solar radiation, Clear sky model Satellite based model Environmental measurement based model Ground meteorological measurement based model
27 Clear sky model Beam radiation at the surface can exceed 70% of the extraterrestrial flux Constant and uniform attenuation factor is assumed Isotropic model is assumed
28 Clear sky model
29 Satellite based models 29
30 Sky transmittance-based models
31 Ground meteorological measurement based model
32 Ground meteorological measurement based model
33 Ground meteorological measurement based model
34 Sensitivity of data
35 Model type and configuration and inputs
36 Number of neurons in the hidden layer If a low number of hidden neurons are used, under fitting may occur and this will cause high training and generalization error while over fitting and high variance may occur when the hidden layer consist of a large number of hidden neurons. Usually the number of hidden nodes can be obtained by using some rules of thumb. For example, the hidden layer s neurons have to be somewhere between the input layer size and the output layer size. the hidden layer will never require more than twice the number of the inputs. the number of hidden nodes are 2/3 or (70%-90%) of the number of input nodes. In addition, it has been recommended that by adding the number of the input to the number of the output and multiply the result by (2/3), the number of the hidden nodes can be achieved.
37 Modeling results using GRNN
38 Summary Artificial Intelligence algorithms are complex algorithms to handle complex problems Simple, deconstructable problems (given network, linear composable power flows) -> standard algorithms Complex problems (many variables, open questions such as network structure) -> complex algorithms We covered: Evolutionary algorithms Artificial neural networks Neural network application for modeling of solar radiation
39 Wilfried Elmenreich Thank you Welcome any question Einführung in Smart Grids 39
40 Further Links Video: 6 minute introduction to FREVO: Download FREVO (open source): A. Sobe, I. Fehérvári, and W. Elmenreich. FREVO: A tool for evolving and evaluating self-organizing systems. In Proceedings of the 1st International Workshop on Evaluation for Self-Adaptive and Self-Organizing Systems, Lyon, France, September I. Fehervari and W. Elmenreich. Evolution as a tool to design selforganizing systems. In Self-Organizing Systems, volume LNCS 8221, pages Springer Verlag, T. Khatib, A Mohamed, K Sopian. A review of solar energy modeling techniques. J. of Renewable & Sustainable Energy Reviews (5): T. Khatib, A. Mohamed, K. Sopian, M. Mahmoud. Assessment of Artificial Neural Networks for Hourly Solar Radiation Prediction. J. of Photoenergy (ID ):1-7.
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