The document discusses modeling mismatch losses due to partial shading in PV plants. It presents a case study comparing different shading patterns across strings in a PV plant. Machine learning approaches like random forest and artificial neural networks were used to approximate mismatch losses, as exact computation can be computationally expensive. The random forest model provided accurate results, with correlation coefficients over 0.95, making it suitable for optimizing PV plant layout and minimizing mismatch losses. Future work involves generalizing and validating the approach for different module technologies and implementing an optimization tool.
Front end buck rectifier with reduced filter size and single-loop controlAsoka Technologies
This paper presents a transformerless solution for front-end rectification, which is particularly suitable for traction applications, requiring high voltages to be stepped down to appropriate dc voltage. The proposed topology is based on pulse widthmodulation buck rectifier (current source inverter topology) and is capable of rectification and stepping down of single-phase ac supply, in a single stage. A new control scheme is proposed to achieve constant dc output voltage and sinusoidal source current, irrespective of large ripples in the dc inductor current. The proposed scheme is configured in single-loop voltage control mode. The relevant small-signal model is derived from the large-signal model using multi order decomposition. An elaborate procedure of dc filter design is discussed, for circuit operation with minimum energy storage. All analytical results are validated by numerical simulation for sinusoidal and distorted source voltage. Experimental verification is achieved through a 1.2-kW grid-connected laboratory prototype.
It is actively developed by the Institute for Automation of Complex Power Systems.
Presented by Marija Stevic during ERIGrid - VILLAS workshop on 13th September 2018 at OFFIS, Oldenburg.
https://www.acs.eonerc.rwth-aachen.de
https://www.fein-aachen.org/projects/villas-framework/
Modified variable neighborhood search algorithm for maximum power point track...TELKOMNIKA JOURNAL
Photovoltaic (PV) systems are being increasingly popular for power generation from solar radiation as the usage of renewable energy grows. To improve the efficiency, the system should operate at its the maximum power point. Hence, several algorithms have been developed for this purpose. Continuous tracking for the maximum power point often leads to heavy energy loss. Furthermore, partial shading can dramatically lower the performance of the system. A modified variable neighborhood search algorithm is proposed resulting zero oscillations around the operating point. A set of variables are used to improve the system’s configurability in various atmospheric and geographical conditions. Simulation result proves the operation of the proposed algorithm, its accuracy, and its fast response time.
Front end buck rectifier with reduced filter size and single-loop controlAsoka Technologies
This paper presents a transformerless solution for front-end rectification, which is particularly suitable for traction applications, requiring high voltages to be stepped down to appropriate dc voltage. The proposed topology is based on pulse widthmodulation buck rectifier (current source inverter topology) and is capable of rectification and stepping down of single-phase ac supply, in a single stage. A new control scheme is proposed to achieve constant dc output voltage and sinusoidal source current, irrespective of large ripples in the dc inductor current. The proposed scheme is configured in single-loop voltage control mode. The relevant small-signal model is derived from the large-signal model using multi order decomposition. An elaborate procedure of dc filter design is discussed, for circuit operation with minimum energy storage. All analytical results are validated by numerical simulation for sinusoidal and distorted source voltage. Experimental verification is achieved through a 1.2-kW grid-connected laboratory prototype.
It is actively developed by the Institute for Automation of Complex Power Systems.
Presented by Marija Stevic during ERIGrid - VILLAS workshop on 13th September 2018 at OFFIS, Oldenburg.
https://www.acs.eonerc.rwth-aachen.de
https://www.fein-aachen.org/projects/villas-framework/
Modified variable neighborhood search algorithm for maximum power point track...TELKOMNIKA JOURNAL
Photovoltaic (PV) systems are being increasingly popular for power generation from solar radiation as the usage of renewable energy grows. To improve the efficiency, the system should operate at its the maximum power point. Hence, several algorithms have been developed for this purpose. Continuous tracking for the maximum power point often leads to heavy energy loss. Furthermore, partial shading can dramatically lower the performance of the system. A modified variable neighborhood search algorithm is proposed resulting zero oscillations around the operating point. A set of variables are used to improve the system’s configurability in various atmospheric and geographical conditions. Simulation result proves the operation of the proposed algorithm, its accuracy, and its fast response time.
Low Power and Area Efficient Multiplier Layout using Transmission GateIJEEE
This paper proposes the design and implementation of a 2-bit multiplier using fully automatic design and semi- custom design. Any digital signal processor has adder and multiplier in its core unit. Low power and high speed mac units are in high demand and therefore make a significant place in today’s vlsi environment. Power consumption of cmos circuits is a major concern in vlsi design. The proposed design is made using transmission gate logicwhich helped in using less number of cmos. The multiplier circuit is first simulated using avlsi cad tool and thus the layout was generated. The proposed circuit is simulated by using 90nm cmos technology with supply voltage of 1.2v. It is found that semi-custom based design produced better results in terms of power dissipation and area.
Final year project ideas for electrical engineering eepowerschool.comMuhammad Sarwar
Final year project is the ultimate achievement of an electrical engineering graduate. The idea
of a final year project is to practically implement the technical and professional skills learned.
Graduates work on different final year project ideas. The title of an FYP should be novel and
the project must have a positive impact on the society. Many students choose their FYP topic
in a haste, and at the end of completion, it’s no good for them. So, choose your final year
project wisely and give a lot of thinking while choosing final year project ideas for your
electrical engineering degree.
This post gives a complete list of final year project ideas for electrical engineering students. A
short summary (or synopsis) of the project has also been given to get the complete
understanding of the project. The summary contains a short introduction, methodology and
project outcomes.
Undergraduate students of BSEE are encouraged to pick a topic that would implement a novel
research idea. Though, only simulations can also be used instead of a design project. Various
simulation softwares are available to implement the FYP e.g, Matlab/Simulink, Power World
Simulator, ETAP, Digsilent PowerFactory, PSCAD etc.
Irradiance-adaptive PV Module Integrated Converter for High Efficiency and Po...Asoka Technologies
The strive for efficient and cost-effective photovoltaic systems motivated the power electronic design developed here. The work resulted in a DC-DC converter for module integration and distributed maximum power point tracking (MPPT) with a novel adaptive control scheme. The latter is essential for the combined features of high energy efficiency and high power quality over a wide range of operating conditions. The switching frequency is optimally modulated as a function of solar irradiance for power conversion efficiency maximization. With the rise of irradiance, the frequency is reduced to reach the conversion efficiency target. A search algorithm is developed to determine the optimal switching frequency step. Reducing the switching frequency may, however, compromise MPPT efficiency. Furthermore, it leads to increased ripple content. Therefore, to achieve a uniform high power quality at all conditions, interleaved converter cells are adaptively activated. The overall cost is kept low by selecting components that allow for implementing the functions at low cost. Simulation results show the high value of the module integrated converter for DC standalone and microgrid applications. A 400 W prototype was implemented at 0.14 Euro/W. Testing showed efficiencies above 95% taking into account all losses from power conversion, MPPT, and measurement and control circuitry.
A wireless precoding technique for millimetre-wave MIMO system based on SIC-MMSETELKOMNIKA JOURNAL
A communication method is proposed using Minimum Mean Square Error (MMSE) precoding and Successive Interference Cancellation (SIC) technique for millimetre-wave multiple-input multiple-output (mm-Wave MIMO) based wireless communication system. The mm-Wave MIMO technology for wireless communication system is the base potential technology for its high data transfer rate followed by data instruction and low power consumption compared to Long-Term Evolution (LTE). The mm-Wave system is already available in indoor hotspot and Wi-Fi backhaul for its high bandwidth availability and potential lead to rate of numerous Gbps/user. But, in mobile wireless communication system this technique is lagging because the channel faces relative orthogonal coordination and multiple node detection problems while rapid movement of nodes (transmitter and receiver) occur. To improve the conventional mm-wave MIMO nodal detection and coordination performance, the system processes data using symbolized error vector technique for linearization. Then the MMSE precoding detection technique improves the link strength by constantly fitting the channel coefficients based on number of independent service antennas (M), Signal to Noise Ratio (SNR), Channel Matrix (CM) and mean square errors (MSE). To maintain sequentially encoded user data connectivity and to overcome data loss, SIC method is used in combination with MMSE. MATLAB was used to validate the proposed system performance.
This paper presents a recursive designing approach for high energy efficient carry select adder (CSA). Nowadays, the portable equipment’s like mobile phones and laptops have higher demands in the market. So, the designers must focus greater attention while designing such devices. Which means that have the devices must have lesser power consumption, low cost and have a better performance. The customers mainly focus on the equipment’s which have lesser power consumption, low cost and better performance. As we all know that the adders are the basic building block of microprocessors. The performance of the adders greatly influences the performance of those processors. The carry select adder is most suitable among other adders which have fast addition operation at low cost. The carry select adder (CSA) consists of chain full adders (FAs) and multiplexers. Here a carry select adder is designed with four FAs and four multiplexers. The proposed structure is assessed by the power consumption of the carry select adder using a 32-nm static CMOS technology for a wide range of supply voltages. The simulation results are obtained using Tanner EDA which reveals that the carry select adder has low power consumption.
Multi-Objective Optimization Based Design of High Efficiency DC-DC Switching ...IJPEDS-IAES
In this paper we explore the feasibility of applying multi objective stochastic
optimization algorithms to the optimal design of switching DC-DC
converters, in this way allowing the direct determination of the Pareto
optimal front of the problem. This approach provides the designer, at
affordable computational cost, a complete optimal set of choices, and a more
general insight in the objectives and parameters space, as compared to other
design procedures. As simple but significant study case we consider a low
power DC-DC hybrid control buck converter. Its optimal design is fully
analyzed basing on a Matlab public domain implementations for the
considered algorithms, the GODLIKE package implementing Genetic
Algorithm (GA), Particle Swarm Optimization (PSO) and Simulated
Annealing (SA). In this way, in a unique optimization environment, three
different optimization approaches are easily implemented and compared.
Basic assumptions for the Matlab model of the converter are briefly
discussed, and the optimal design choice is validated “a-posteriori” with
SPICE simulations.
For every car manufacturer, it is essential to reduce
the weight of vehicles. To help manufacturers reduce weight
factors, cable industries propose several solutions to reduce the
weight of harnesses such as creating new wires with reduced
conducting sections. However, we offer another complementary
solution, based on using the PLC (Power Line Communication)
technology inside a vehicle. In this article, we address the
problem of vehicle PLC, focusing on the channel modelling. The
aim of this paper is to design a novel PLC channel model under
CST MWS (CST Microwave Studio) software, able to emulate a
real vehicle PLC environment. Simulation results are compared
to experimental measurements.
Evaluation of massive multiple-input multiple-output communication performanc...IAESIJAI
The fundamental of a downlink massive multiple-input multiple-output (MIMO) energy-issue efficiency strategy is known as minimum mean squared error (MMSE) implementation degrades the performance of a downlink massive MIMO energy-efficiency scheme, so some improvements are adding for this precoding scheme to improve its workthat is called our proposal solution as a proposed improved MMSE precoder (PIMP). The energy efficiency (EE) study has also taken into mind drastically lowering radiated power while maintaining high throughput and minimizing interference issues. We further find the tradeoff between spectral efficiency (SE) and EE although they coincide at the beginning but later their interests become conflicting and divergent then leading EE to decrease so gradually while SE continues increasing logarithmically. The results achieved that for a single-cellular massive MU-MIMO downlink model, our PIMP scheme is the appropriate scenario to achieve higher precoding performance system. Furthermore, both maximum ratio transmission (MRT) and PIMP are suitable for performance improvement in massive MIMO results of EE and SE. So, the main contribution comes with this work that highest EE and SE are belong to use a PIMP which performs better appreciably than MRT at bigger ratio of number of antennas to the number of the users.
Similar to 26 corbellini random forest for mismatch (20)
State of ICS and IoT Cyber Threat Landscape Report 2024 previewPrayukth K V
The IoT and OT threat landscape report has been prepared by the Threat Research Team at Sectrio using data from Sectrio, cyber threat intelligence farming facilities spread across over 85 cities around the world. In addition, Sectrio also runs AI-based advanced threat and payload engagement facilities that serve as sinks to attract and engage sophisticated threat actors, and newer malware including new variants and latent threats that are at an earlier stage of development.
The latest edition of the OT/ICS and IoT security Threat Landscape Report 2024 also covers:
State of global ICS asset and network exposure
Sectoral targets and attacks as well as the cost of ransom
Global APT activity, AI usage, actor and tactic profiles, and implications
Rise in volumes of AI-powered cyberattacks
Major cyber events in 2024
Malware and malicious payload trends
Cyberattack types and targets
Vulnerability exploit attempts on CVEs
Attacks on counties – USA
Expansion of bot farms – how, where, and why
In-depth analysis of the cyber threat landscape across North America, South America, Europe, APAC, and the Middle East
Why are attacks on smart factories rising?
Cyber risk predictions
Axis of attacks – Europe
Systemic attacks in the Middle East
Download the full report from here:
https://sectrio.com/resources/ot-threat-landscape-reports/sectrio-releases-ot-ics-and-iot-security-threat-landscape-report-2024/
Connector Corner: Automate dynamic content and events by pushing a buttonDianaGray10
Here is something new! In our next Connector Corner webinar, we will demonstrate how you can use a single workflow to:
Create a campaign using Mailchimp with merge tags/fields
Send an interactive Slack channel message (using buttons)
Have the message received by managers and peers along with a test email for review
But there’s more:
In a second workflow supporting the same use case, you’ll see:
Your campaign sent to target colleagues for approval
If the “Approve” button is clicked, a Jira/Zendesk ticket is created for the marketing design team
But—if the “Reject” button is pushed, colleagues will be alerted via Slack message
Join us to learn more about this new, human-in-the-loop capability, brought to you by Integration Service connectors.
And...
Speakers:
Akshay Agnihotri, Product Manager
Charlie Greenberg, Host
JMeter webinar - integration with InfluxDB and GrafanaRTTS
Watch this recorded webinar about real-time monitoring of application performance. See how to integrate Apache JMeter, the open-source leader in performance testing, with InfluxDB, the open-source time-series database, and Grafana, the open-source analytics and visualization application.
In this webinar, we will review the benefits of leveraging InfluxDB and Grafana when executing load tests and demonstrate how these tools are used to visualize performance metrics.
Length: 30 minutes
Session Overview
-------------------------------------------
During this webinar, we will cover the following topics while demonstrating the integrations of JMeter, InfluxDB and Grafana:
- What out-of-the-box solutions are available for real-time monitoring JMeter tests?
- What are the benefits of integrating InfluxDB and Grafana into the load testing stack?
- Which features are provided by Grafana?
- Demonstration of InfluxDB and Grafana using a practice web application
To view the webinar recording, go to:
https://www.rttsweb.com/jmeter-integration-webinar
DevOps and Testing slides at DASA ConnectKari Kakkonen
My and Rik Marselis slides at 30.5.2024 DASA Connect conference. We discuss about what is testing, then what is agile testing and finally what is Testing in DevOps. Finally we had lovely workshop with the participants trying to find out different ways to think about quality and testing in different parts of the DevOps infinity loop.
Let's dive deeper into the world of ODC! Ricardo Alves (OutSystems) will join us to tell all about the new Data Fabric. After that, Sezen de Bruijn (OutSystems) will get into the details on how to best design a sturdy architecture within ODC.
LF Energy Webinar: Electrical Grid Modelling and Simulation Through PowSyBl -...DanBrown980551
Do you want to learn how to model and simulate an electrical network from scratch in under an hour?
Then welcome to this PowSyBl workshop, hosted by Rte, the French Transmission System Operator (TSO)!
During the webinar, you will discover the PowSyBl ecosystem as well as handle and study an electrical network through an interactive Python notebook.
PowSyBl is an open source project hosted by LF Energy, which offers a comprehensive set of features for electrical grid modelling and simulation. Among other advanced features, PowSyBl provides:
- A fully editable and extendable library for grid component modelling;
- Visualization tools to display your network;
- Grid simulation tools, such as power flows, security analyses (with or without remedial actions) and sensitivity analyses;
The framework is mostly written in Java, with a Python binding so that Python developers can access PowSyBl functionalities as well.
What you will learn during the webinar:
- For beginners: discover PowSyBl's functionalities through a quick general presentation and the notebook, without needing any expert coding skills;
- For advanced developers: master the skills to efficiently apply PowSyBl functionalities to your real-world scenarios.
Kubernetes & AI - Beauty and the Beast !?! @KCD Istanbul 2024Tobias Schneck
As AI technology is pushing into IT I was wondering myself, as an “infrastructure container kubernetes guy”, how get this fancy AI technology get managed from an infrastructure operational view? Is it possible to apply our lovely cloud native principals as well? What benefit’s both technologies could bring to each other?
Let me take this questions and provide you a short journey through existing deployment models and use cases for AI software. On practical examples, we discuss what cloud/on-premise strategy we may need for applying it to our own infrastructure to get it to work from an enterprise perspective. I want to give an overview about infrastructure requirements and technologies, what could be beneficial or limiting your AI use cases in an enterprise environment. An interactive Demo will give you some insides, what approaches I got already working for real.
Smart TV Buyer Insights Survey 2024 by 91mobiles.pdf91mobiles
91mobiles recently conducted a Smart TV Buyer Insights Survey in which we asked over 3,000 respondents about the TV they own, aspects they look at on a new TV, and their TV buying preferences.
Essentials of Automations: Optimizing FME Workflows with ParametersSafe Software
Are you looking to streamline your workflows and boost your projects’ efficiency? Do you find yourself searching for ways to add flexibility and control over your FME workflows? If so, you’re in the right place.
Join us for an insightful dive into the world of FME parameters, a critical element in optimizing workflow efficiency. This webinar marks the beginning of our three-part “Essentials of Automation” series. This first webinar is designed to equip you with the knowledge and skills to utilize parameters effectively: enhancing the flexibility, maintainability, and user control of your FME projects.
Here’s what you’ll gain:
- Essentials of FME Parameters: Understand the pivotal role of parameters, including Reader/Writer, Transformer, User, and FME Flow categories. Discover how they are the key to unlocking automation and optimization within your workflows.
- Practical Applications in FME Form: Delve into key user parameter types including choice, connections, and file URLs. Allow users to control how a workflow runs, making your workflows more reusable. Learn to import values and deliver the best user experience for your workflows while enhancing accuracy.
- Optimization Strategies in FME Flow: Explore the creation and strategic deployment of parameters in FME Flow, including the use of deployment and geometry parameters, to maximize workflow efficiency.
- Pro Tips for Success: Gain insights on parameterizing connections and leveraging new features like Conditional Visibility for clarity and simplicity.
We’ll wrap up with a glimpse into future webinars, followed by a Q&A session to address your specific questions surrounding this topic.
Don’t miss this opportunity to elevate your FME expertise and drive your projects to new heights of efficiency.
GraphRAG is All You need? LLM & Knowledge GraphGuy Korland
Guy Korland, CEO and Co-founder of FalkorDB, will review two articles on the integration of language models with knowledge graphs.
1. Unifying Large Language Models and Knowledge Graphs: A Roadmap.
https://arxiv.org/abs/2306.08302
2. Microsoft Research's GraphRAG paper and a review paper on various uses of knowledge graphs:
https://www.microsoft.com/en-us/research/blog/graphrag-unlocking-llm-discovery-on-narrative-private-data/
1. PVPMC 2017 - SUPSI - LUGANO
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Gianluca Corbellini
Modeling of mismatch losses due to partial
shading in PV plants with custom modules
2. PVPMC 2017 - SUPSI - LUGANO
Agenda
Context of the project
Mismatch in PV fields
Case studies
Machine learning approaches
Results
Conclusions and next steps
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3. PVPMC 2017 - SUPSI - LUGANO
Context of the project
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PV plants are becoming very cheap, already in grid parity in most of countries
• lower margins short time to optimize the design (15min)
• designers not specialized in PV technology lack of know how
• DSOs reducing feed-in tariffs self consumption improves ROI
• MLPE are becoming more competitive when are they convenient?
There is a need in the market for a tool that has an high accuracy and can easily
optimize the design of overall PV plant in energetic and economic meanings
4. PVPMC 2017 - SUPSI - LUGANO
Context of the project
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The DesignPV project aims to support the development of inSun, a new tool for
the design and simulation of PV plants, implementing innovative features to:
Improve the accuracy of irradiation patterns
Simulate the mismatches occurring in complex PV installation
Optimize the electrical layout of PV plants (orientation, inverters, arrays,
cabling, BoS)
The project is financed by the Commission for Innovation and Technology of the
Swiss Confederation
6. PVPMC 2017 - SUPSI - LUGANO
Test case - Residential
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House fully covered with BIPV modules and complex shadings due to obstacles
and surrounding buildings – Optimal economic (LCOE) solution is not trivial.
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Test cases - Industrial
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Industrial building with sheds and trees, a good positioning of modules and
cabling into string and MPPTs can improve significantly overall performances.
It could be hard to find the best trade off between cablings and energy yield.
8. PVPMC 2017 - SUPSI - LUGANO
Test cases - BIPV
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Installation on façade need to have a smart cabling of modules, very hard to
design it manually depending on obstacles.
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Mismatch in PV fields
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PV plants performance are affected by different sources of mismatch:
• Electrical characteristics of PV modules (current and voltage)
• Cells’ temperature (voltage)
• Non uniform soiling
• Degradation
• Irradiance due to partial shading (current)
Mismatch losses are defined as:
ML =
𝑃𝐼 − 𝑃𝐴
𝑃𝐼
Where 𝑃𝐼 is the ideal power output if every cells work at MPP, while 𝑃𝐴 is the
power output in actual conditions
10. PVPMC 2017 - SUPSI - LUGANO
Approximation of Mismatch
Random Forest
Averages the output of regression trees that approximate
the target as a piecewise-constant function for different
subset of the inputs
Artificial Neural Newtork
Approximate the target iteratively transforming affine
functions of the inputs with a nonlinear 'activation
function' (usually sigmoid)
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For big PV plants and complex irradiation patterns the exact computation of mismatch
losses can be computationally expensive, so an approximated model could speed up the
energy yield simulation.
Two machine learning approaches have been studied:
Averaging
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PV Field modelling
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To generalize the model to any number of submodules per string, the input of the ANN and
RF have been normalized to the length of the string (shading fraction), moreover the
diffuse fraction is considered as input. The test case is a Poly-Si module.
Machine Learning
s1
s2
…
sN
kD
Mismatch
Losses
Example
s = [7/16 6/16 3/16 0 0 0]
kD = 0.3
ML = 0.244
Both machine learning approaches
need to be trained with a large dataset
of examples, to minimize the size of
the training dataset some equivalence
classes are considered:
• the shading fraction is sorted
• Position of modules inside its string
is not considered
The computation of the prediction is
extremely fast in both cases.
si ∈ [0, 1] kD ∈ 0.1, 1 ML ∈ [0.1, 1]
12. PVPMC 2017 - SUPSI - LUGANO
Case Study
PV Plant with a single inverter (single MPPT), field of 6 strings of 16 submodules each.
Yellow submodules get full irradiance (global) while grey ones get only diffuse irradiance,
different diffuse ratio are simulated, results below are referring to 0.3 (e.g. global of 1000
W/m2 of which 300 W/m of diffuse).
16 submodules are shaded, how the mismatch loss is affected from the distribution of the
shading pattern among the strings?
Optimal cabling of modules in arrays
BEST CASE - 0.1%WORST CASE - 24.4%
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13. PVPMC 2017 - SUPSI - LUGANO
Results
Results are presented for number of
strings between 1 and 5, the
correlation coefficient are very high,
guaranteeing good approximation
and also good ranking capabilities
(optimization tool)
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# of
strings
RMSE R2 Spearman
correlation
Pearson
correlation
1 0.0279 0.937 0.981 0.968
2 0.0128 0.988 0.996 0.994
3 0.0084 0.995 0.998 0.997
4 0.0082 0.997 0.998 0.998
5 0.0148 0.985 0.994 0.992
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Conclusions and next steps
The Random Forest model provide a very good accuracy and is fast to run inside a
simulation tool
• Generalize the approach to different technologies, high efficiency modules (> losses)
and modules with lower fill factor (< losses)
New Random Forest can be easily trained
• Validate the exact and approximated models with real PV plants
Measurement during the summer with natural and artificial shadings
• Design and implementation of a tool for the layout optimization of PV fields,
arrangement of modules in strings to minimize the mismatch losses
Ongoing CTI project with inSun
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15. PVPMC 2017 - SUPSI - LUGANO
Thank you for you attention
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