Pub Date : 2017-06-01DOI: 10.1109/ISIE.2017.8001350
A. Markou, A. Soldatos, N. Hatziargyriou
This paper deals with the control problem of a dc-dc boost converter whose operation takes place in an uncertain environment. The proposed nonlinear controller achieves the desired performance in a number of different situations. Uncertainties, unknown but bounded, are considered to be present in the load as well as in the input voltage. Effective control results as long as certain matching assumptions for the uncertainty are satisfied. If these assumptions are violated, a measure of mismatch is established that corresponds to residual uncertainty. An optimization problem is formulated that yields a threshold of the measure of mismatch which guarantees that maximum unmatched uncertainty can be tolerated.
{"title":"Optimal nonlinear robust control of a boost converter","authors":"A. Markou, A. Soldatos, N. Hatziargyriou","doi":"10.1109/ISIE.2017.8001350","DOIUrl":"https://doi.org/10.1109/ISIE.2017.8001350","url":null,"abstract":"This paper deals with the control problem of a dc-dc boost converter whose operation takes place in an uncertain environment. The proposed nonlinear controller achieves the desired performance in a number of different situations. Uncertainties, unknown but bounded, are considered to be present in the load as well as in the input voltage. Effective control results as long as certain matching assumptions for the uncertainty are satisfied. If these assumptions are violated, a measure of mismatch is established that corresponds to residual uncertainty. An optimization problem is formulated that yields a threshold of the measure of mismatch which guarantees that maximum unmatched uncertainty can be tolerated.","PeriodicalId":6597,"journal":{"name":"2017 IEEE 26th International Symposium on Industrial Electronics (ISIE)","volume":"3 1","pages":"811-814"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90187937","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 : 2017-06-01DOI: 10.1109/ISIE.2017.8001267
Amesh Narain Singh, W. Cronje, W. Doorsamy
Utilities employ Thermal instability testing (TIT) for final acceptance testing alter the construction and refurbishment of turbogenerator rotors. This type of testing is performed through two methodologies namely current injection and friction/windage in order to assess the thermal sensitivity of the machine's rotor. Although there are distinct differences between the two methods, no apparent preference is shown by service providers/OEMS globally. There is also no definitive evidence or standards that offer a comparison of the two methods and suitability assessment thereof. The presented research investigates these two methods of TIT for a synchronous generator rotor. An experimental setup with infrared thermography is employed to investigate the thermal behaviour of the machine's rotor for each of the test methods. Experimental results show that the thermal behavior of the generator rotor is significantly different for each methodology. It is also shown in this paper that contemporary TIT practice requires an augmented test methodology.
{"title":"Investigation of thermal instability testing on synchronous generator rotors using an experimental direct mapping method","authors":"Amesh Narain Singh, W. Cronje, W. Doorsamy","doi":"10.1109/ISIE.2017.8001267","DOIUrl":"https://doi.org/10.1109/ISIE.2017.8001267","url":null,"abstract":"Utilities employ Thermal instability testing (TIT) for final acceptance testing alter the construction and refurbishment of turbogenerator rotors. This type of testing is performed through two methodologies namely current injection and friction/windage in order to assess the thermal sensitivity of the machine's rotor. Although there are distinct differences between the two methods, no apparent preference is shown by service providers/OEMS globally. There is also no definitive evidence or standards that offer a comparison of the two methods and suitability assessment thereof. The presented research investigates these two methods of TIT for a synchronous generator rotor. An experimental setup with infrared thermography is employed to investigate the thermal behaviour of the machine's rotor for each of the test methods. Experimental results show that the thermal behavior of the generator rotor is significantly different for each methodology. It is also shown in this paper that contemporary TIT practice requires an augmented test methodology.","PeriodicalId":6597,"journal":{"name":"2017 IEEE 26th International Symposium on Industrial Electronics (ISIE)","volume":"25 1","pages":"321-328"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88738144","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 : 2017-06-01DOI: 10.1109/ISIE.2017.8001479
Y. Y. Nazaruddin, Antony Siahaan
This paper discusses an experiment-based approach to teaching intelligent control methodologies for students conducted at the Engineering Physics Department, Institut Teknologi Bandung, Indonesia. The teaching process conducted in the form of student final project involving several tasks, i.e. plant analysis and modeling, building up intelligent control structures for on-line purposes, implementing real-time control, and investigating the results of control performances. A laboratory-scaled process mini-plant, which has strongly inherent mechanical nonlinearity due to its mechanical components which is made difficult to control, has been used for the experiment. The objective of control is to maintain the fluid level in a tank to a specified level. Intelligent control scheme using two neural network structures was developed for this purpose, namely the feedforward neural network, which is employed as the plant identifier, and the diagonal recurrent neural network as the controller. The neural models are developed based on an on-line learning process so that the plant parameters can be adapted to the changes occurred at the plant. Results of control implementation demonstrate the applicability and the performance of the developed intelligent control scheme and has deepened students understanding and capability to implement intelligent control strategy in real-time environment.
{"title":"Teaching intelligent control using a laboratory-scaled process mini-plant","authors":"Y. Y. Nazaruddin, Antony Siahaan","doi":"10.1109/ISIE.2017.8001479","DOIUrl":"https://doi.org/10.1109/ISIE.2017.8001479","url":null,"abstract":"This paper discusses an experiment-based approach to teaching intelligent control methodologies for students conducted at the Engineering Physics Department, Institut Teknologi Bandung, Indonesia. The teaching process conducted in the form of student final project involving several tasks, i.e. plant analysis and modeling, building up intelligent control structures for on-line purposes, implementing real-time control, and investigating the results of control performances. A laboratory-scaled process mini-plant, which has strongly inherent mechanical nonlinearity due to its mechanical components which is made difficult to control, has been used for the experiment. The objective of control is to maintain the fluid level in a tank to a specified level. Intelligent control scheme using two neural network structures was developed for this purpose, namely the feedforward neural network, which is employed as the plant identifier, and the diagonal recurrent neural network as the controller. The neural models are developed based on an on-line learning process so that the plant parameters can be adapted to the changes occurred at the plant. Results of control implementation demonstrate the applicability and the performance of the developed intelligent control scheme and has deepened students understanding and capability to implement intelligent control strategy in real-time environment.","PeriodicalId":6597,"journal":{"name":"2017 IEEE 26th International Symposium on Industrial Electronics (ISIE)","volume":"46 1","pages":"1567-1572"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85324637","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 : 2017-06-01DOI: 10.1109/ISIE.2017.8001446
J. Blanche, D. Flynn, Helen Lewis, G. Couples, R. Cheung
In this paper we explore the suitability of Frequency Modulated Continuous Wave sensing for geomaterial property classification. Seminal results derived from analysis of return signal amplitude and phase over a frequency bandwidth of 9.25–10.75 GHz are presented. Due to advances in microwave electronics, our evaluation explores the concept of a novel desktop analysis system for real-time monitoring of geomaterial properties. A range of geomaterial samples are analysed including, Darney, Locharbriggs and Red St. Bees Sandstones. Ambient environment ground truth measurements are compared to samples imbibed with deionised (DI) water. Results indicate that each geomaterial sample can be clearly identified, with the Darney Sandstone exhibiting the clearest response to fluid ingress, with a phase shift relative to a “dry” sample of 126° for DI water. The results of these preliminary experiments support the sensitivity of the FMCW sensing modality to variances in geomaterial properties.
本文探讨了调频连续波传感技术在地物属性分类中的适用性。对9.25-10.75 GHz频率范围内的回波信号幅度和相位进行了分析，得到了一些重要的结果。由于微波电子学的进步，我们的评估探讨了一种用于实时监测地质材料特性的新型桌面分析系统的概念。一系列的地质材料样本被分析，包括，达尼，Locharbriggs和Red St. Bees砂岩。周围环境的地面真值测量与用去离子水(DI)吸收的样品进行了比较。结果表明，每种地质材料样品都可以被清楚地识别出来，其中Darney砂岩对流体进入的响应最明显，相对于“干”样品，DI水的相移为126°。这些初步实验的结果支持了FMCW传感模式对岩土材料特性变化的敏感性。
{"title":"Analysis of geomaterials using frequency modulated continuous wave radar in the X-band","authors":"J. Blanche, D. Flynn, Helen Lewis, G. Couples, R. Cheung","doi":"10.1109/ISIE.2017.8001446","DOIUrl":"https://doi.org/10.1109/ISIE.2017.8001446","url":null,"abstract":"In this paper we explore the suitability of Frequency Modulated Continuous Wave sensing for geomaterial property classification. Seminal results derived from analysis of return signal amplitude and phase over a frequency bandwidth of 9.25–10.75 GHz are presented. Due to advances in microwave electronics, our evaluation explores the concept of a novel desktop analysis system for real-time monitoring of geomaterial properties. A range of geomaterial samples are analysed including, Darney, Locharbriggs and Red St. Bees Sandstones. Ambient environment ground truth measurements are compared to samples imbibed with deionised (DI) water. Results indicate that each geomaterial sample can be clearly identified, with the Darney Sandstone exhibiting the clearest response to fluid ingress, with a phase shift relative to a “dry” sample of 126° for DI water. The results of these preliminary experiments support the sensitivity of the FMCW sensing modality to variances in geomaterial properties.","PeriodicalId":6597,"journal":{"name":"2017 IEEE 26th International Symposium on Industrial Electronics (ISIE)","volume":"27 1","pages":"1376-1381"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90398472","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 : 2017-06-01DOI: 10.1109/ISIE.2017.8001393
G. Rigatos, P. Siano, Farouk ZOUARI, S. Ademi
A nonlinear H-infinity (optimal) control method is developed for the problem of simultaneous control of the depth and heading angle of an autonomous submarine. This is a multi-variable nonlinear control problem and its solution allows for precise underwater navigation of the submarine. The submarine's dynamic model undergoes approximate linearization around a temporary equilibrium that is recmputed at each iteration of the control algorithm. The linearization procedure is based on Taylor series expansion and on the computation of the submarine's model Jacobian matrices. For the approximately linearized model, the optimal control problem is solved through the design of an H-infinity feedback controller. The computation of the controller's gain requires the solution of an algebraic Riccati equstion, which is repetitively performed at each step of the control method. The stability of the control scheme is proven through Lyapunov analysis. First, it is demonstrated that for the submarine's control loop, the H-infinity tracking performance criterion holds. Moroever, under moderate conditions it is shown that that the control scheme is globally asymptotically stable.
{"title":"A nonlinear optimal control methoc for autonomous submarines' diving","authors":"G. Rigatos, P. Siano, Farouk ZOUARI, S. Ademi","doi":"10.1109/ISIE.2017.8001393","DOIUrl":"https://doi.org/10.1109/ISIE.2017.8001393","url":null,"abstract":"A nonlinear H-infinity (optimal) control method is developed for the problem of simultaneous control of the depth and heading angle of an autonomous submarine. This is a multi-variable nonlinear control problem and its solution allows for precise underwater navigation of the submarine. The submarine's dynamic model undergoes approximate linearization around a temporary equilibrium that is recmputed at each iteration of the control algorithm. The linearization procedure is based on Taylor series expansion and on the computation of the submarine's model Jacobian matrices. For the approximately linearized model, the optimal control problem is solved through the design of an H-infinity feedback controller. The computation of the controller's gain requires the solution of an algebraic Riccati equstion, which is repetitively performed at each step of the control method. The stability of the control scheme is proven through Lyapunov analysis. First, it is demonstrated that for the submarine's control loop, the H-infinity tracking performance criterion holds. Moroever, under moderate conditions it is shown that that the control scheme is globally asymptotically stable.","PeriodicalId":6597,"journal":{"name":"2017 IEEE 26th International Symposium on Industrial Electronics (ISIE)","volume":"37 11 1","pages":"1061-1066"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78332137","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 : 2017-06-01DOI: 10.1109/ISIE.2017.8001565
Christiaan M. Fourie, D. V. Bhatt, B. Silva, Anuj Kumar, G. Hancke
Fish conservation is a concern due to the impact of industrial fishing that causes overfishing. Fish farming has been an approach to fish conservation and systems are required to monitor ecosystems. This paper describes the design of a solar powered autonomous fish pond management system that can be used for fish conservation. The system consists of a floating node, equipped with sensors, that is able to regulate the water's pH and also dispense food into the water as necessary. It is found that the system is able to successfully control the pond's temperature and dissolved oxygen.
{"title":"A solar-powered fish pond management system for fish farmng conservation","authors":"Christiaan M. Fourie, D. V. Bhatt, B. Silva, Anuj Kumar, G. Hancke","doi":"10.1109/ISIE.2017.8001565","DOIUrl":"https://doi.org/10.1109/ISIE.2017.8001565","url":null,"abstract":"Fish conservation is a concern due to the impact of industrial fishing that causes overfishing. Fish farming has been an approach to fish conservation and systems are required to monitor ecosystems. This paper describes the design of a solar powered autonomous fish pond management system that can be used for fish conservation. The system consists of a floating node, equipped with sensors, that is able to regulate the water's pH and also dispense food into the water as necessary. It is found that the system is able to successfully control the pond's temperature and dissolved oxygen.","PeriodicalId":6597,"journal":{"name":"2017 IEEE 26th International Symposium on Industrial Electronics (ISIE)","volume":"13 1","pages":"2021-2026"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75972582","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 : 2017-06-01DOI: 10.1109/ISIE.2017.8001275
L. Ferraris, F. Franchini, E. Pošković
In the recent past the authors dedicated much work to small PM motor adopting permanent bonded magnets, and to the magnetization problems. Now it is largely proposed the so-called Halbach magnetization, presenting the directions of the magnetic induction variable along the magnet; its constitutes a tentative of sinusoidality for the magnetic induction component orthogonal to the magnet surface. It was decided to try to realize a motor prototype through the realization of the magnets by accosting small sectors, each with a magnetization direction different, and aiming to obtain an Halbach magnetization. In this paper a FEM simulation activity is presented to select the proper choice of the number and characteristics of the elementary sectors. At first the simulation instrument reliability has been tested through a confrontation between simulated and experimental results for some typical situations. Then the analysis was devoted to compare the windings rms voltage value and the cogging torque amplitude; the selected reference case is the one providing a radial magnetization. The analyzed solutions provide some hypothetical composed magnets, having different number of sectors and different angular amplitudes. Such activity allowed interesting considerations and a criterion useful for the choice of the magnets characteristics and for the number of the elementary sectors to be adopted for the motor prototype. The negative effect of the Halbach solution on the cogging torque amplitude is considered too.
{"title":"Study of the Halbach magnetization in small PM electrical machines adopting the bonded magnets","authors":"L. Ferraris, F. Franchini, E. Pošković","doi":"10.1109/ISIE.2017.8001275","DOIUrl":"https://doi.org/10.1109/ISIE.2017.8001275","url":null,"abstract":"In the recent past the authors dedicated much work to small PM motor adopting permanent bonded magnets, and to the magnetization problems. Now it is largely proposed the so-called Halbach magnetization, presenting the directions of the magnetic induction variable along the magnet; its constitutes a tentative of sinusoidality for the magnetic induction component orthogonal to the magnet surface. It was decided to try to realize a motor prototype through the realization of the magnets by accosting small sectors, each with a magnetization direction different, and aiming to obtain an Halbach magnetization. In this paper a FEM simulation activity is presented to select the proper choice of the number and characteristics of the elementary sectors. At first the simulation instrument reliability has been tested through a confrontation between simulated and experimental results for some typical situations. Then the analysis was devoted to compare the windings rms voltage value and the cogging torque amplitude; the selected reference case is the one providing a radial magnetization. The analyzed solutions provide some hypothetical composed magnets, having different number of sectors and different angular amplitudes. Such activity allowed interesting considerations and a criterion useful for the choice of the magnets characteristics and for the number of the elementary sectors to be adopted for the motor prototype. The negative effect of the Halbach solution on the cogging torque amplitude is considered too.","PeriodicalId":6597,"journal":{"name":"2017 IEEE 26th International Symposium on Industrial Electronics (ISIE)","volume":"23 1","pages":"374-380"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75684145","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 : 2017-06-01DOI: 10.1109/ISIE.2017.8001567
M. L. Phaswana, G. Hancke, T. D. Ramotsoela
Video surveillance has become a widely used monitoring medium. Most of the recorded data is not useful so storing it all is not practical. For these systems to be useful it requires a human operator to consistently monitor the footage. This paper proposes the use of an autonomous monitoring system for public residential streets. Only relevant footage is recorded and stored greatly reducing the storage requirements. At the core of this system, is a human detection and tracking algorithm. For the desired system, an improved HOG human detector was used to extract human features in video frames while a Kalman filter was used to track detected human subjects. The overall system accuracy was determined as 86.39% demonstrated the effectiveness and robustness of the proposed system.
{"title":"Autonomous monitoring system for a public residential street","authors":"M. L. Phaswana, G. Hancke, T. D. Ramotsoela","doi":"10.1109/ISIE.2017.8001567","DOIUrl":"https://doi.org/10.1109/ISIE.2017.8001567","url":null,"abstract":"Video surveillance has become a widely used monitoring medium. Most of the recorded data is not useful so storing it all is not practical. For these systems to be useful it requires a human operator to consistently monitor the footage. This paper proposes the use of an autonomous monitoring system for public residential streets. Only relevant footage is recorded and stored greatly reducing the storage requirements. At the core of this system, is a human detection and tracking algorithm. For the desired system, an improved HOG human detector was used to extract human features in video frames while a Kalman filter was used to track detected human subjects. The overall system accuracy was determined as 86.39% demonstrated the effectiveness and robustness of the proposed system.","PeriodicalId":6597,"journal":{"name":"2017 IEEE 26th International Symposium on Industrial Electronics (ISIE)","volume":"13 1","pages":"2032-2037"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74588362","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 : 2017-06-01DOI: 10.1109/ISIE.2017.8001303
P. Evald, J. L. Mor, Débora Debiaze de Paula, A. S. Ferreira, S. Botelho, R. Z. Azzolin
This work shows three control techniques applied individually on velocity control of a welding robot. The system transfer function is found by bench tests and pole allocation method. The control strategies proposed are: Proportional Integral Controller, Pole Place Control and Model Reference Control. The techniques were designed and simulated to compare its performances acting under same situations.
{"title":"Performance comparison of control strategies applied on welding robot plant","authors":"P. Evald, J. L. Mor, Débora Debiaze de Paula, A. S. Ferreira, S. Botelho, R. Z. Azzolin","doi":"10.1109/ISIE.2017.8001303","DOIUrl":"https://doi.org/10.1109/ISIE.2017.8001303","url":null,"abstract":"This work shows three control techniques applied individually on velocity control of a welding robot. The system transfer function is found by bench tests and pole allocation method. The control strategies proposed are: Proportional Integral Controller, Pole Place Control and Model Reference Control. The techniques were designed and simulated to compare its performances acting under same situations.","PeriodicalId":6597,"journal":{"name":"2017 IEEE 26th International Symposium on Industrial Electronics (ISIE)","volume":"52 1","pages":"539-544"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73689635","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 : 2017-06-01DOI: 10.1109/ISIE.2017.8001227
I. Nicolae, P. Nicolae, R. Marinescu
The paper is focused on finding appropriate procedures of denoising electrical signals (SN) acquired from the secondary winding of the excitation transformer in a large power group and evaluating their benefits. The signals were affected by white Gaussian noise with relatively high Signal to Noise ratios. The currents have significant harmonic contents (total harmonic distortions exceeding 25%). Two sets of 30 consecutive periods from quasi-stationary data, corresponding to different active powers, were analyzed. Firstly “average” signals (AS) of one period length were determined in order to obtain estimated values for the power of noise (EPN). Computations were made afterward by using the 1-st periods from the acquired signals in order to establish the best denoising parameters, considering the EPN and the root mean square differences relative to the AS when compared to signals denoised (SD) in different ways. Once determined the denoising parameters, the 1-st periods from SN, AS and SD were analyzed by using original FFT based programs in order to evaluate power quality (PQ) indices of all types of signals. Conclusions were drawn relative to the effects of denoising over the accuracy in evaluating PQ indices.
{"title":"Dealing with noise polluting electric signals acquired from a large power group","authors":"I. Nicolae, P. Nicolae, R. Marinescu","doi":"10.1109/ISIE.2017.8001227","DOIUrl":"https://doi.org/10.1109/ISIE.2017.8001227","url":null,"abstract":"The paper is focused on finding appropriate procedures of denoising electrical signals (SN) acquired from the secondary winding of the excitation transformer in a large power group and evaluating their benefits. The signals were affected by white Gaussian noise with relatively high Signal to Noise ratios. The currents have significant harmonic contents (total harmonic distortions exceeding 25%). Two sets of 30 consecutive periods from quasi-stationary data, corresponding to different active powers, were analyzed. Firstly “average” signals (AS) of one period length were determined in order to obtain estimated values for the power of noise (EPN). Computations were made afterward by using the 1-st periods from the acquired signals in order to establish the best denoising parameters, considering the EPN and the root mean square differences relative to the AS when compared to signals denoised (SD) in different ways. Once determined the denoising parameters, the 1-st periods from SN, AS and SD were analyzed by using original FFT based programs in order to evaluate power quality (PQ) indices of all types of signals. Conclusions were drawn relative to the effects of denoising over the accuracy in evaluating PQ indices.","PeriodicalId":6597,"journal":{"name":"2017 IEEE 26th International Symposium on Industrial Electronics (ISIE)","volume":"32 1","pages":"82-87"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73984474","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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