Pub Date : 2019-05-01DOI: 10.1109/PEPQA.2019.8851547
J. Estrada, E. Cano-Plata, A. Ustariz-Farfán
This paper suggests that the presence of microwaves in high voltage transformers is caused by the creation of negative resistance associated with an internal parasite oscillator.Full performance of the electric transformer includes not only forced oscillations like the fundamental and its odd harmonics, assuming the input voltage sinusoidal and the nonlinear coil unpolarized. There also appear free oscillations. They have features associated with forced oscillations, so it might be better to characterize them as free-forced electric waves. We studied a circuit including a nonlinear core driving by two a-c waves designated fundamental and third harmonic. With the two input currents flowing through the coil, a complete set of modulation sidebands is generated.Our research suggests that wireless acquiring and further processing of these free microwaves may reveal new transformer features as aging.We review these concepts and offer some radiated microwaves measurements results taken below 115 KV industrial and dwelling electric lines circuits. Acquisition of microwaves is performed with a typical amplifier followed by a personal computer. Further, we realized a lab experiment with 16, 75 KVA distribution transformers looking for signatures related to forced aging. Transformers were conducted to failure by installing them in a high temperature camera. Measurements and processing of microwaves generation is a proposes a new way to assess electric power quality.
{"title":"Core microwaves generation may contain information on electric transformers aging","authors":"J. Estrada, E. Cano-Plata, A. Ustariz-Farfán","doi":"10.1109/PEPQA.2019.8851547","DOIUrl":"https://doi.org/10.1109/PEPQA.2019.8851547","url":null,"abstract":"This paper suggests that the presence of microwaves in high voltage transformers is caused by the creation of negative resistance associated with an internal parasite oscillator.Full performance of the electric transformer includes not only forced oscillations like the fundamental and its odd harmonics, assuming the input voltage sinusoidal and the nonlinear coil unpolarized. There also appear free oscillations. They have features associated with forced oscillations, so it might be better to characterize them as free-forced electric waves. We studied a circuit including a nonlinear core driving by two a-c waves designated fundamental and third harmonic. With the two input currents flowing through the coil, a complete set of modulation sidebands is generated.Our research suggests that wireless acquiring and further processing of these free microwaves may reveal new transformer features as aging.We review these concepts and offer some radiated microwaves measurements results taken below 115 KV industrial and dwelling electric lines circuits. Acquisition of microwaves is performed with a typical amplifier followed by a personal computer. Further, we realized a lab experiment with 16, 75 KVA distribution transformers looking for signatures related to forced aging. Transformers were conducted to failure by installing them in a high temperature camera. Measurements and processing of microwaves generation is a proposes a new way to assess electric power quality.","PeriodicalId":192905,"journal":{"name":"2019 IEEE Workshop on Power Electronics and Power Quality Applications (PEPQA)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121868741","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 : 2019-05-01DOI: 10.1109/PEPQA.2019.8851533
Laura M. Cruz, D. Alvarez, S. Rivera, Fernando A. Herrera
This paper presents a model to forecast load in short-term (24 h) aiming to support decision-making during contingencies in power distribution systems. The methodology is based on the calculation of both, coefficients and angles of the Fourier series in order to characterize the load curve. These parameters are fitted using historical load reports. The proposed methodology was performed using the data of two power transformers to show the behaviour of the demand curve for weekdays as well as for weekends. The quadratic mean errors obtained using the proposed algorithm and according to the computational efficiency in the fitting of the coefficients, it is possible implement the algorithm in the power systems control and operation planning.
{"title":"Short-Term Demand Forecast Using Fourier Series","authors":"Laura M. Cruz, D. Alvarez, S. Rivera, Fernando A. Herrera","doi":"10.1109/PEPQA.2019.8851533","DOIUrl":"https://doi.org/10.1109/PEPQA.2019.8851533","url":null,"abstract":"This paper presents a model to forecast load in short-term (24 h) aiming to support decision-making during contingencies in power distribution systems. The methodology is based on the calculation of both, coefficients and angles of the Fourier series in order to characterize the load curve. These parameters are fitted using historical load reports. The proposed methodology was performed using the data of two power transformers to show the behaviour of the demand curve for weekdays as well as for weekends. The quadratic mean errors obtained using the proposed algorithm and according to the computational efficiency in the fitting of the coefficients, it is possible implement the algorithm in the power systems control and operation planning.","PeriodicalId":192905,"journal":{"name":"2019 IEEE Workshop on Power Electronics and Power Quality Applications (PEPQA)","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115816183","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 : 2019-05-01DOI: 10.1109/PEPQA.2019.8851553
C. García-Ceballos, J. Mora-Flórez, S. Pérez-Londoño, L. Rodriguez-Garcia
A methodology for optimally tune PI controls in voltage source converters (VSC) is presented. The parameters of the proportional and integral level zero and primary control of the VSC are considered by proposing an objective function based on the error estimation, from the desired and the measured outputs. The minimization of the objective function is performed using particle swarm optimization (PSO) technique. The proposed methodology and the test scenarios are implemented in MATLAB-Simulink for a grid-connected microgrid, which includes a renewable source, load, distribution line and disturbances in reference signals and in the microgrid. The results show the advantages of the proposed methodology considering the adequate performance of the proportional integral control of the converter.
{"title":"Optimal control tuning of a VSC converter for microgrid applications","authors":"C. García-Ceballos, J. Mora-Flórez, S. Pérez-Londoño, L. Rodriguez-Garcia","doi":"10.1109/PEPQA.2019.8851553","DOIUrl":"https://doi.org/10.1109/PEPQA.2019.8851553","url":null,"abstract":"A methodology for optimally tune PI controls in voltage source converters (VSC) is presented. The parameters of the proportional and integral level zero and primary control of the VSC are considered by proposing an objective function based on the error estimation, from the desired and the measured outputs. The minimization of the objective function is performed using particle swarm optimization (PSO) technique. The proposed methodology and the test scenarios are implemented in MATLAB-Simulink for a grid-connected microgrid, which includes a renewable source, load, distribution line and disturbances in reference signals and in the microgrid. The results show the advantages of the proposed methodology considering the adequate performance of the proportional integral control of the converter.","PeriodicalId":192905,"journal":{"name":"2019 IEEE Workshop on Power Electronics and Power Quality Applications (PEPQA)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123863369","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 : 2019-05-01DOI: 10.1109/PEPQA.2019.8851536
A. I. Narvaez-Villota, A. Ustariz-Farfán, L. F. Diaz-Cadavid, J. A. Ocampo-Wilches, E. Cano-Plata
The real-time data flow over TCP/IP (Transmission Control Protocol/Internet Protocol) between running simulation models allows evaluating the designed models and its communication capabilities. This paper presents a proposed methodology for the data flow in real time between modeled components of a protection scheme with local control, for a distribution system in Smart Grids. The proposed methodology specifies the characteristics of the modeled components, as Intelligent Electronic Devices (IEDs) and a Local Control Center (LCC). In addition, the communication network architecture based on TCP/IP protocol to allow the data flow is selected. In order to evaluate the methodology, a case study is implemented in MATLAB/Simulink. In the case study test, the LCC response time is measured. The obtained results in the LCC response time measurements were lower than 110 ms.
{"title":"Development of a Methodology for Data Flow over TCP/IP for a Protection Scheme in Smart Grids","authors":"A. I. Narvaez-Villota, A. Ustariz-Farfán, L. F. Diaz-Cadavid, J. A. Ocampo-Wilches, E. Cano-Plata","doi":"10.1109/PEPQA.2019.8851536","DOIUrl":"https://doi.org/10.1109/PEPQA.2019.8851536","url":null,"abstract":"The real-time data flow over TCP/IP (Transmission Control Protocol/Internet Protocol) between running simulation models allows evaluating the designed models and its communication capabilities. This paper presents a proposed methodology for the data flow in real time between modeled components of a protection scheme with local control, for a distribution system in Smart Grids. The proposed methodology specifies the characteristics of the modeled components, as Intelligent Electronic Devices (IEDs) and a Local Control Center (LCC). In addition, the communication network architecture based on TCP/IP protocol to allow the data flow is selected. In order to evaluate the methodology, a case study is implemented in MATLAB/Simulink. In the case study test, the LCC response time is measured. The obtained results in the LCC response time measurements were lower than 110 ms.","PeriodicalId":192905,"journal":{"name":"2019 IEEE Workshop on Power Electronics and Power Quality Applications (PEPQA)","volume":"49 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131032737","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 : 2019-05-01DOI: 10.1109/PEPQA.2019.8851571
H. Albunashee, R. McCann
Reactive power (Q) is typically supplied by capacitor banks in conventional electric power distribution systems. However, the increasing use of distributed energy resources (DERs) complicates the ability to regulate voltages using conventional methods. This creates a need for secure network controls for coordinating reactive power compensation. Inverters presently used with wind and solar DERs have the ability to inject Q but do not have real-time information of the amount of Q consumed in the distribution system. In this paper, a combination of a tertiary droop control assisted by an ac-based state estimator for a ring/mesh distribution system is designed to control a 12.47kV DER to supply the required Q. Detailed simulation results show that such a combination can control DERs to keep the power factor greater than 98% at remote distribution substations in a quasi-real-time fashion. The results suggest that the future of distribution management systems (DMS) should follow the same trends in transmission-level energy management systems (EMS) in controlling DERs.
{"title":"State Estimation and Real-Time Cyber Secure Power Factor Correction for Utility-Scale DERs","authors":"H. Albunashee, R. McCann","doi":"10.1109/PEPQA.2019.8851571","DOIUrl":"https://doi.org/10.1109/PEPQA.2019.8851571","url":null,"abstract":"Reactive power (Q) is typically supplied by capacitor banks in conventional electric power distribution systems. However, the increasing use of distributed energy resources (DERs) complicates the ability to regulate voltages using conventional methods. This creates a need for secure network controls for coordinating reactive power compensation. Inverters presently used with wind and solar DERs have the ability to inject Q but do not have real-time information of the amount of Q consumed in the distribution system. In this paper, a combination of a tertiary droop control assisted by an ac-based state estimator for a ring/mesh distribution system is designed to control a 12.47kV DER to supply the required Q. Detailed simulation results show that such a combination can control DERs to keep the power factor greater than 98% at remote distribution substations in a quasi-real-time fashion. The results suggest that the future of distribution management systems (DMS) should follow the same trends in transmission-level energy management systems (EMS) in controlling DERs.","PeriodicalId":192905,"journal":{"name":"2019 IEEE Workshop on Power Electronics and Power Quality Applications (PEPQA)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132709350","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 : 2019-05-01DOI: 10.1109/pepqa.2019.8851544
{"title":"PEPQA 2019 Committees","authors":"","doi":"10.1109/pepqa.2019.8851544","DOIUrl":"https://doi.org/10.1109/pepqa.2019.8851544","url":null,"abstract":"","PeriodicalId":192905,"journal":{"name":"2019 IEEE Workshop on Power Electronics and Power Quality Applications (PEPQA)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134366226","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 : 2019-05-01DOI: 10.1109/PEPQA.2019.8851548
A. Guerrero-Guerrero, J. L. Castiblanco-Pasuy, A. Ustariz-Farfán, E. Cano-Plata
This paper presents a novel topology which reduces losses through soft switching technique and has an energy recovery circuit. The proposed topology takes advantage of inductor and capacitor parallel connection to reduce switching losses to off. The values of the capacitor and the inductor are selected using a genetic algorithm (GA). The circuit and operating principle of the proposed topology are presented. Validation is carried out by means simulation and the results are presented. Simulations using LTspice of the proposed topology and conventional hard switching topologies are compared. The soft switching proposed topology shows a reduction of switching losses of up to 12.5 % with respect to conventional hard switching topology.
{"title":"Characterization of Parameters of a Non-dissipative Snubber Network Using a Genetic Algorithm","authors":"A. Guerrero-Guerrero, J. L. Castiblanco-Pasuy, A. Ustariz-Farfán, E. Cano-Plata","doi":"10.1109/PEPQA.2019.8851548","DOIUrl":"https://doi.org/10.1109/PEPQA.2019.8851548","url":null,"abstract":"This paper presents a novel topology which reduces losses through soft switching technique and has an energy recovery circuit. The proposed topology takes advantage of inductor and capacitor parallel connection to reduce switching losses to off. The values of the capacitor and the inductor are selected using a genetic algorithm (GA). The circuit and operating principle of the proposed topology are presented. Validation is carried out by means simulation and the results are presented. Simulations using LTspice of the proposed topology and conventional hard switching topologies are compared. The soft switching proposed topology shows a reduction of switching losses of up to 12.5 % with respect to conventional hard switching topology.","PeriodicalId":192905,"journal":{"name":"2019 IEEE Workshop on Power Electronics and Power Quality Applications (PEPQA)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115834976","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 : 2019-05-01DOI: 10.1109/PEPQA.2019.8851557
María García-Rodríguez, Jeisson Moreno-Vargas, G. Osma-Pinto, César Duarte-Gualdrón
Over the last years, the implementation of PV systems has been growing rapidly. The PV penetration in power systems means new concerns about their impacts on the power quality (PQ) of the distribution networks. Both, intermittent nature of solar PV and electronic power devices used in PV systems could affect the voltage profile, harmonic distortions, and voltage unbalance, among others. The aim of this paper is to evaluate and quantify the impact of PV systems on some PQ parameters of low voltage (LV) distribution networks. This, by performing a comparative statistical analysis through the application of hypothesis testing of the difference between two population means, where those populations are the data with and without PV generation classified into PV power and load power scenarios. The methodology covers the selection of PQ parameters and their monitoring, the application of a scenario matrix for grouping data with similar load and PV injection conditions, and, lastly, the Wilcoxon rank sum test (non-parametric test) is applied. This methodology is applied to evaluate the effect of the integration of a PV system (9.8 kWp) on the LV network of a university building.
{"title":"Study of the impact of grid connected PV system on PQ through a comparative analysis by scenarios","authors":"María García-Rodríguez, Jeisson Moreno-Vargas, G. Osma-Pinto, César Duarte-Gualdrón","doi":"10.1109/PEPQA.2019.8851557","DOIUrl":"https://doi.org/10.1109/PEPQA.2019.8851557","url":null,"abstract":"Over the last years, the implementation of PV systems has been growing rapidly. The PV penetration in power systems means new concerns about their impacts on the power quality (PQ) of the distribution networks. Both, intermittent nature of solar PV and electronic power devices used in PV systems could affect the voltage profile, harmonic distortions, and voltage unbalance, among others. The aim of this paper is to evaluate and quantify the impact of PV systems on some PQ parameters of low voltage (LV) distribution networks. This, by performing a comparative statistical analysis through the application of hypothesis testing of the difference between two population means, where those populations are the data with and without PV generation classified into PV power and load power scenarios. The methodology covers the selection of PQ parameters and their monitoring, the application of a scenario matrix for grouping data with similar load and PV injection conditions, and, lastly, the Wilcoxon rank sum test (non-parametric test) is applied. This methodology is applied to evaluate the effect of the integration of a PV system (9.8 kWp) on the LV network of a university building.","PeriodicalId":192905,"journal":{"name":"2019 IEEE Workshop on Power Electronics and Power Quality Applications (PEPQA)","volume":"os-35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127776179","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 : 2019-05-01DOI: 10.1109/pepqa.2019.8851560
{"title":"PEPQA 2019 Sponsors","authors":"","doi":"10.1109/pepqa.2019.8851560","DOIUrl":"https://doi.org/10.1109/pepqa.2019.8851560","url":null,"abstract":"","PeriodicalId":192905,"journal":{"name":"2019 IEEE Workshop on Power Electronics and Power Quality Applications (PEPQA)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133021211","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 : 2019-05-01DOI: 10.1109/PEPQA.2019.8851546
David F. Celeita, Diego Clavijo, G. Ramos
The use of real-time simulation tools brings several possibilities for improving testing and prototype assessment with higher precision and ensuring reliability in the study of power systems. This paper shows the design and implementation of a phasor measurement unit (PMU) in conjunction with synchronized phasor data concentrator (PDC software) to measure electrical parameters within a running real-time simulation of a power system. The system’s performance is evaluated under different scenarios to ensure standardized features of the virtual PMU and check consistent data collected by the PDC. A real case study of the Colombian transmission system is implemented. Finally, future applications and possibilities that can be developed with this platform are described.
{"title":"PMU and PDC server implementation integrated to real-time simulation tools","authors":"David F. Celeita, Diego Clavijo, G. Ramos","doi":"10.1109/PEPQA.2019.8851546","DOIUrl":"https://doi.org/10.1109/PEPQA.2019.8851546","url":null,"abstract":"The use of real-time simulation tools brings several possibilities for improving testing and prototype assessment with higher precision and ensuring reliability in the study of power systems. This paper shows the design and implementation of a phasor measurement unit (PMU) in conjunction with synchronized phasor data concentrator (PDC software) to measure electrical parameters within a running real-time simulation of a power system. The system’s performance is evaluated under different scenarios to ensure standardized features of the virtual PMU and check consistent data collected by the PDC. A real case study of the Colombian transmission system is implemented. Finally, future applications and possibilities that can be developed with this platform are described.","PeriodicalId":192905,"journal":{"name":"2019 IEEE Workshop on Power Electronics and Power Quality Applications (PEPQA)","volume":"149 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113972854","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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