Pub Date : 2020-10-28DOI: 10.23919/AADECA49780.2020.9301642
J. Gómez, G. D. Sad
In this paper, a Kalman Filter type algorithm is introduced for the recursive estimation of the states of linear systems whose outputs are measured through sensors with multilevel quantized outputs. It is also shown how the algorithm can be adapted for the parameter estimation of linear systems in linear regression form, from quantized outputs. The influence of the quantization step on the performance of the proposed algorithms is analyzed through simulation examples.
{"title":"A State Observer from Multilevel Quantized Outputs","authors":"J. Gómez, G. D. Sad","doi":"10.23919/AADECA49780.2020.9301642","DOIUrl":"https://doi.org/10.23919/AADECA49780.2020.9301642","url":null,"abstract":"In this paper, a Kalman Filter type algorithm is introduced for the recursive estimation of the states of linear systems whose outputs are measured through sensors with multilevel quantized outputs. It is also shown how the algorithm can be adapted for the parameter estimation of linear systems in linear regression form, from quantized outputs. The influence of the quantization step on the performance of the proposed algorithms is analyzed through simulation examples.","PeriodicalId":127488,"journal":{"name":"2020 Argentine Conference on Automatic Control (AADECA)","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132978299","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-28DOI: 10.23919/AADECA49780.2020.9301639
R. Peña, R. Fernández, Mario Valagao Sancho, Marcelo A. Lorenc, Cristian Sosa Tellechea
In this paper, the control of an energy recovery system is analyzed. The energy recovery system is built with a pump working as a turbine (PAT), an asynchronous generator, and a four-quadrants converter that connects the system to the electrical network. This system regulates the water pressure at the output of the PAT and, because of the drop in pressure, it injects the recovered energy in the electrical grid. Furthermore, a controller is designed for the system shaping the dynamic response of the system using a Bessel polynomial and practical considerations. The design of the controller is validated through simulations.
{"title":"Control of a centrifugal pump as a turbine in an energy recovery system","authors":"R. Peña, R. Fernández, Mario Valagao Sancho, Marcelo A. Lorenc, Cristian Sosa Tellechea","doi":"10.23919/AADECA49780.2020.9301639","DOIUrl":"https://doi.org/10.23919/AADECA49780.2020.9301639","url":null,"abstract":"In this paper, the control of an energy recovery system is analyzed. The energy recovery system is built with a pump working as a turbine (PAT), an asynchronous generator, and a four-quadrants converter that connects the system to the electrical network. This system regulates the water pressure at the output of the PAT and, because of the drop in pressure, it injects the recovered energy in the electrical grid. Furthermore, a controller is designed for the system shaping the dynamic response of the system using a Bessel polynomial and practical considerations. The design of the controller is validated through simulations.","PeriodicalId":127488,"journal":{"name":"2020 Argentine Conference on Automatic Control (AADECA)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131720530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-28DOI: 10.23919/AADECA49780.2020.9301640
S. Bragagnolo, J. Vaschetti, F. Magnago
One-level optimization methods have been proposed to optimize a single user’s load profile or a cluster of users. In this work, two two-level optimization methods are studied, one case considering technical requirements and another considering economic criteria. In the upper level, the supplier optimizes it objective function. Meanwhile, at the lower level, users optimize their electrical costs. The proposed methods are based on Genetic Algorithm (GA) methods. In this sense, an indirect control is established in which users react to a price signal. Simulation results illustrate that both cases improve the demand profile and increase the retailer profit with respect to an unscheduled case. However, when the supplier tries to maximize the profit, some users receive benefits in detriment of others, concluding that the technical approach is preferable to the economic one.
{"title":"A Technical and Economic Approach to Multi-Level Optimization Models for Electricity Demand Considering User-Supplier Interaction","authors":"S. Bragagnolo, J. Vaschetti, F. Magnago","doi":"10.23919/AADECA49780.2020.9301640","DOIUrl":"https://doi.org/10.23919/AADECA49780.2020.9301640","url":null,"abstract":"One-level optimization methods have been proposed to optimize a single user’s load profile or a cluster of users. In this work, two two-level optimization methods are studied, one case considering technical requirements and another considering economic criteria. In the upper level, the supplier optimizes it objective function. Meanwhile, at the lower level, users optimize their electrical costs. The proposed methods are based on Genetic Algorithm (GA) methods. In this sense, an indirect control is established in which users react to a price signal. Simulation results illustrate that both cases improve the demand profile and increase the retailer profit with respect to an unscheduled case. However, when the supplier tries to maximize the profit, some users receive benefits in detriment of others, concluding that the technical approach is preferable to the economic one.","PeriodicalId":127488,"journal":{"name":"2020 Argentine Conference on Automatic Control (AADECA)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122400787","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-28DOI: 10.23919/AADECA49780.2020.9301635
Andrea Hernández-Arango, Alejandro Herrón-Bedoya, Valentina Paredes-Ángel
This work presents a model for flow dynamics in stirred tanks with elastic walls, where fluids behave similarly as they do in human organs. By modeling such behaviour, it is possible to describe and simulate physiological events accurately. The model is applied to describe the movement of chyme, also called gastric mass, through the small intestine, using Fung model to characterize the intestinal walls. The analogy with elastic tanks makes it possible to reliably calculate transit time, and with the addition of digestion and absorption kinetics, the model would be useful to estimate the rate of appearance of substances (e.g. glucose, drugs) into the bloodstream after oral ingestion. The model is phenomenological-based, which makes it possible and simple to adapt it to other particular situations, and even different organs with similar elastic characteristics. Its phenomenological nature also implies parameter interpretability, property specially useful in physiological models.
{"title":"Phenomenological-Based Model of Tanks with Hyperelastic Walls Connected in Series","authors":"Andrea Hernández-Arango, Alejandro Herrón-Bedoya, Valentina Paredes-Ángel","doi":"10.23919/AADECA49780.2020.9301635","DOIUrl":"https://doi.org/10.23919/AADECA49780.2020.9301635","url":null,"abstract":"This work presents a model for flow dynamics in stirred tanks with elastic walls, where fluids behave similarly as they do in human organs. By modeling such behaviour, it is possible to describe and simulate physiological events accurately. The model is applied to describe the movement of chyme, also called gastric mass, through the small intestine, using Fung model to characterize the intestinal walls. The analogy with elastic tanks makes it possible to reliably calculate transit time, and with the addition of digestion and absorption kinetics, the model would be useful to estimate the rate of appearance of substances (e.g. glucose, drugs) into the bloodstream after oral ingestion. The model is phenomenological-based, which makes it possible and simple to adapt it to other particular situations, and even different organs with similar elastic characteristics. Its phenomenological nature also implies parameter interpretability, property specially useful in physiological models.","PeriodicalId":127488,"journal":{"name":"2020 Argentine Conference on Automatic Control (AADECA)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126491898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-28DOI: 10.23919/AADECA49780.2020.9301630
Emanuel Bernardi, E. J. Adam
This short paper presents a strategy to tolerate the income of additive faults in nonlinear chemical processes. For that, an observed-based fault detection and diagnosis scheme is implemented to generate an early and detailed fault information. Then, this valuable knowledge is used to compensate the effects induced by actuators and sensors faults throughout the use of an integrated optimization-based estimation and model predictive control scheme, which allows to track a reference even in presence of faults. A simulation based on a typical chemical industrial process, the highly non-linear continuous stirred tank reactor, is addressed to illustrate the design process and the performance of such approach.
{"title":"Nonlinear Fault-tolerant Model Predictive Control Strategy for Industrial Processes","authors":"Emanuel Bernardi, E. J. Adam","doi":"10.23919/AADECA49780.2020.9301630","DOIUrl":"https://doi.org/10.23919/AADECA49780.2020.9301630","url":null,"abstract":"This short paper presents a strategy to tolerate the income of additive faults in nonlinear chemical processes. For that, an observed-based fault detection and diagnosis scheme is implemented to generate an early and detailed fault information. Then, this valuable knowledge is used to compensate the effects induced by actuators and sensors faults throughout the use of an integrated optimization-based estimation and model predictive control scheme, which allows to track a reference even in presence of faults. A simulation based on a typical chemical industrial process, the highly non-linear continuous stirred tank reactor, is addressed to illustrate the design process and the performance of such approach.","PeriodicalId":127488,"journal":{"name":"2020 Argentine Conference on Automatic Control (AADECA)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117088785","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-28DOI: 10.23919/AADECA49780.2020.9301637
Viyils Sangregorio‐Soto, C. Garzón‐Castro, G. Mazzanti, Manuel Figueredo, J. Cortés-Romero
Microalgae have been explored as a promising alternative energy source over the last few years, and several control strategies have been developed to maintain their operational conditions. However, these bioprocesses still pose difficult challenges, due to the nonlinearity and uncertainties of microalgal dynamics. This paper addresses the problem of biomass regulation in a continuous culture of the microalga Dunaliella tertiolecta. Our strategy is based on a Proportional-Integral (PI) controller assisted by a Generalized Proportional Integral (GPI) observer, in order to mitigate the impact of disturbances on biomass levels. The proposed design was tested via numerical simulation, using MATLAB/Simulink™ 2020a environment. The robustness of the controller was demonstrated by subjecting the simulated bioreactor to disturbances and changes in reference biomass densities. The proposed strategy effectively tracked the reference within an insignificant deviation ±0.5%. Furthermore, our proposal effectively rejected disturbances that classical PI was unable to counter.
{"title":"Proportional-Integral Controller Assisted by GPI Observer for Microalgal Continuous Culture","authors":"Viyils Sangregorio‐Soto, C. Garzón‐Castro, G. Mazzanti, Manuel Figueredo, J. Cortés-Romero","doi":"10.23919/AADECA49780.2020.9301637","DOIUrl":"https://doi.org/10.23919/AADECA49780.2020.9301637","url":null,"abstract":"Microalgae have been explored as a promising alternative energy source over the last few years, and several control strategies have been developed to maintain their operational conditions. However, these bioprocesses still pose difficult challenges, due to the nonlinearity and uncertainties of microalgal dynamics. This paper addresses the problem of biomass regulation in a continuous culture of the microalga Dunaliella tertiolecta. Our strategy is based on a Proportional-Integral (PI) controller assisted by a Generalized Proportional Integral (GPI) observer, in order to mitigate the impact of disturbances on biomass levels. The proposed design was tested via numerical simulation, using MATLAB/Simulink™ 2020a environment. The robustness of the controller was demonstrated by subjecting the simulated bioreactor to disturbances and changes in reference biomass densities. The proposed strategy effectively tracked the reference within an insignificant deviation ±0.5%. Furthermore, our proposal effectively rejected disturbances that classical PI was unable to counter.","PeriodicalId":127488,"journal":{"name":"2020 Argentine Conference on Automatic Control (AADECA)","volume":"18 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130929674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-28DOI: 10.23919/AADECA49780.2020.9301641
P. Donato, Álvaro Hernández, M. Funes, I. Carugati, Rubén Nieto, J. Ureña
Smart grids are a concept that is becoming a concrete reality in developed countries, and is only just emerging in developing countries. In both cases, they are transforming the customers' relationship with electricity in unexpected ways. In this work, it is shown an overview of some functionalities that will be developed within the smart grids, which have a common denominator: the use of non-intrusive load monitoring techniques. Some of these new functionalities have special relevance in the electrical networks of developing countries which present complex challenges and need to be updated fast. There are also some of the features that will be shown to present great challenges in developed countries at present, but which will be of interest in the future in the rest of the world.
{"title":"Review of NILM applications in smart grids: power quality assessment and assisted independent living","authors":"P. Donato, Álvaro Hernández, M. Funes, I. Carugati, Rubén Nieto, J. Ureña","doi":"10.23919/AADECA49780.2020.9301641","DOIUrl":"https://doi.org/10.23919/AADECA49780.2020.9301641","url":null,"abstract":"Smart grids are a concept that is becoming a concrete reality in developed countries, and is only just emerging in developing countries. In both cases, they are transforming the customers' relationship with electricity in unexpected ways. In this work, it is shown an overview of some functionalities that will be developed within the smart grids, which have a common denominator: the use of non-intrusive load monitoring techniques. Some of these new functionalities have special relevance in the electrical networks of developing countries which present complex challenges and need to be updated fast. There are also some of the features that will be shown to present great challenges in developed countries at present, but which will be of interest in the future in the rest of the world.","PeriodicalId":127488,"journal":{"name":"2020 Argentine Conference on Automatic Control (AADECA)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115270094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-28DOI: 10.23919/AADECA49780.2020.9301638
Hugo O. Garcés, A. Rojas
Combustion is at the core of many industrial activities, and it is still mainly tied to non-renewable and contaminating fuel sources. This situation calls for maximizing the efficiency of these types of processes, as well as reducing the contaminants produced. Extremum seeking control (ESC) has the potential to achieve the efficiency required. Here we identify a ladle furnace process using optical variables (OV). We test the options of a Hammerstein or Hammerstein-Wiener plant structures. We then propose an ESC design for the identified nonlinear plant model and simulate its operation. Finally, motivated by a future implementation of the designed ESC over a network, we analyze through simulations three communication networks features: the variance of a communication channel additive noise, the variance of a communication channel gain, and the probability of packet-dropouts.
{"title":"Analysis of flame temperature optimization subject to network limitations","authors":"Hugo O. Garcés, A. Rojas","doi":"10.23919/AADECA49780.2020.9301638","DOIUrl":"https://doi.org/10.23919/AADECA49780.2020.9301638","url":null,"abstract":"Combustion is at the core of many industrial activities, and it is still mainly tied to non-renewable and contaminating fuel sources. This situation calls for maximizing the efficiency of these types of processes, as well as reducing the contaminants produced. Extremum seeking control (ESC) has the potential to achieve the efficiency required. Here we identify a ladle furnace process using optical variables (OV). We test the options of a Hammerstein or Hammerstein-Wiener plant structures. We then propose an ESC design for the identified nonlinear plant model and simulate its operation. Finally, motivated by a future implementation of the designed ESC over a network, we analyze through simulations three communication networks features: the variance of a communication channel additive noise, the variance of a communication channel gain, and the probability of packet-dropouts.","PeriodicalId":127488,"journal":{"name":"2020 Argentine Conference on Automatic Control (AADECA)","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121208323","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-28DOI: 10.23919/AADECA49780.2020.9301633
M. Patrone, D. Feroldi
A battery/supercapacitor electric vehicle is a promising configuration for vehicles with zero emissions and high efficiency. The propulsion system consists of an electric motor and the energy storage system is composed of batteries and supercapacitors. The electric vehicle is a power system in which the motor and the storage devices are coupled to a common DC bus through power converters. A proper energy management of the energy storage system is required to meet the power required by the electric motor. Since the storage devices possess complementary electric characteristics, it is expected that the controller achieves the main task of satisfying the demanded energy, exploiting these features to get substantial benefits in the vehicle driving performance and the battery life. In this article, we propose an energy management designed via passivity-based control for a battery/supercapacitor electric vehicle. The controller commands the energy storage system to satisfy the electric motor demand, reducing the high peak power undergone by the battery through the high power capacity of the supercapacitors. The methodology is tested under several demanding driving cycles and the results show that the battery life could be significantly extended.
{"title":"Energy Management via Passivity-Based Control for Battery/Supercapacitor Electric Vehicles","authors":"M. Patrone, D. Feroldi","doi":"10.23919/AADECA49780.2020.9301633","DOIUrl":"https://doi.org/10.23919/AADECA49780.2020.9301633","url":null,"abstract":"A battery/supercapacitor electric vehicle is a promising configuration for vehicles with zero emissions and high efficiency. The propulsion system consists of an electric motor and the energy storage system is composed of batteries and supercapacitors. The electric vehicle is a power system in which the motor and the storage devices are coupled to a common DC bus through power converters. A proper energy management of the energy storage system is required to meet the power required by the electric motor. Since the storage devices possess complementary electric characteristics, it is expected that the controller achieves the main task of satisfying the demanded energy, exploiting these features to get substantial benefits in the vehicle driving performance and the battery life. In this article, we propose an energy management designed via passivity-based control for a battery/supercapacitor electric vehicle. The controller commands the energy storage system to satisfy the electric motor demand, reducing the high peak power undergone by the battery through the high power capacity of the supercapacitors. The methodology is tested under several demanding driving cycles and the results show that the battery life could be significantly extended.","PeriodicalId":127488,"journal":{"name":"2020 Argentine Conference on Automatic Control (AADECA)","volume":"142 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124494942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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