Pub Date : 2015-06-16DOI: 10.1109/ICCEP.2015.7177633
E. Ciapessoni, D. Cirio, F. Conte, S. Massucco, F. Silvestro
This paper considers a demand side response system for frequency control in agreement with suggestions proposed by the European Network of Transmission System Operators for Electricity (ENTSO-E). Such a control strategy is designed for supporting primary frequency regulation through thermostatically controlled loads, such as domestic refrigerators and water heaters. A realistic simulation study within the scenario of the Sardinian electric network, in a 2020 forecast horizon, is presented. Results show the advantages and drawbacks of the considered strategy.
{"title":"Demand side response for frequency control in a regional power system","authors":"E. Ciapessoni, D. Cirio, F. Conte, S. Massucco, F. Silvestro","doi":"10.1109/ICCEP.2015.7177633","DOIUrl":"https://doi.org/10.1109/ICCEP.2015.7177633","url":null,"abstract":"This paper considers a demand side response system for frequency control in agreement with suggestions proposed by the European Network of Transmission System Operators for Electricity (ENTSO-E). Such a control strategy is designed for supporting primary frequency regulation through thermostatically controlled loads, such as domestic refrigerators and water heaters. A realistic simulation study within the scenario of the Sardinian electric network, in a 2020 forecast horizon, is presented. Results show the advantages and drawbacks of the considered strategy.","PeriodicalId":423870,"journal":{"name":"2015 International Conference on Clean Electrical Power (ICCEP)","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121007684","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 : 2015-06-16DOI: 10.1109/ICCEP.2015.7177545
H. Martínez-García, Y. Bolea, A. Grau-Saldes
Linear-assisted DC/DC converters are structures that allow to take advantages of the two classic alternatives in the design of power supply systems: Voltage linear regulators (classic NPN topology or LDO-low dropout-) and switching DC/DC converters. This paper shows the proposal of a modified current-mode one-cycle control for linear-assisted DC/DC converters. The modified current-mode one-cycle control technique is proposed in order to obtain the duty cycle of the linear-assisted converter switch. The proposed structure can provide an output with suitable load and line regulations. The paper shows the design of the proposed modified current-mode one-cycle linear-assisted regulator and simulation results that validate the aforementioned proposal. Specifically, the proposed system has been used to recharger outdoor autonomous robots in off-grid areas.
{"title":"One-cycle control-based linear-assisted DC/DC regulator for photovoltaic outdoor robotic recharger","authors":"H. Martínez-García, Y. Bolea, A. Grau-Saldes","doi":"10.1109/ICCEP.2015.7177545","DOIUrl":"https://doi.org/10.1109/ICCEP.2015.7177545","url":null,"abstract":"Linear-assisted DC/DC converters are structures that allow to take advantages of the two classic alternatives in the design of power supply systems: Voltage linear regulators (classic NPN topology or LDO-low dropout-) and switching DC/DC converters. This paper shows the proposal of a modified current-mode one-cycle control for linear-assisted DC/DC converters. The modified current-mode one-cycle control technique is proposed in order to obtain the duty cycle of the linear-assisted converter switch. The proposed structure can provide an output with suitable load and line regulations. The paper shows the design of the proposed modified current-mode one-cycle linear-assisted regulator and simulation results that validate the aforementioned proposal. Specifically, the proposed system has been used to recharger outdoor autonomous robots in off-grid areas.","PeriodicalId":423870,"journal":{"name":"2015 International Conference on Clean Electrical Power (ICCEP)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128772481","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 : 2015-06-16DOI: 10.1109/ICCEP.2015.7177629
C. Mademlis
This paper investigates the influence of the measurement accuracy of the wind sensors on a wind energy conversion system (WECS) performance. Specifically, the wind speed and direction sensors installed at the end of the nacelle of a three blades horizontal axis wind turbine are considered. Due to the turbulence in the wake behind the wind turbine blades, wind direction measurement is highly affected; whereas, satisfactorily accurate measurement of the wind speed can be obtained from sensors at the rear part of the turbine. Moreover, any discrepancy caused by the rotating rotor at the wind speed measurement is known with satisfactory accuracy from the rotor aerodynamic model and thus, can be taken into consideration in the processing of the data obtained. Therefore, if the required information for both MPPT and yawing control is obtained by the wind speed, WECS can be driven to a satisfactory performance. On the contrary, if WECS operation and specifically yawing control is based on direct wind direction measurement with sensors installed at the rear part of the nacelle, may result to high discrepancies from the optimum performance. Thus, a combined control technique of accurate MPPT, optimization of the electrical generator efficiency and reliable yaw control can provide maximum electric energy production of the WECS and reduction of the cut-in wind speed towards the low wind speed range. Several simulation results are presented in order to demonstrate the effectiveness and operational improvement of the suggested control scheme.
{"title":"Influence of the measurement accuracy of wind sensors on wind system performance","authors":"C. Mademlis","doi":"10.1109/ICCEP.2015.7177629","DOIUrl":"https://doi.org/10.1109/ICCEP.2015.7177629","url":null,"abstract":"This paper investigates the influence of the measurement accuracy of the wind sensors on a wind energy conversion system (WECS) performance. Specifically, the wind speed and direction sensors installed at the end of the nacelle of a three blades horizontal axis wind turbine are considered. Due to the turbulence in the wake behind the wind turbine blades, wind direction measurement is highly affected; whereas, satisfactorily accurate measurement of the wind speed can be obtained from sensors at the rear part of the turbine. Moreover, any discrepancy caused by the rotating rotor at the wind speed measurement is known with satisfactory accuracy from the rotor aerodynamic model and thus, can be taken into consideration in the processing of the data obtained. Therefore, if the required information for both MPPT and yawing control is obtained by the wind speed, WECS can be driven to a satisfactory performance. On the contrary, if WECS operation and specifically yawing control is based on direct wind direction measurement with sensors installed at the rear part of the nacelle, may result to high discrepancies from the optimum performance. Thus, a combined control technique of accurate MPPT, optimization of the electrical generator efficiency and reliable yaw control can provide maximum electric energy production of the WECS and reduction of the cut-in wind speed towards the low wind speed range. Several simulation results are presented in order to demonstrate the effectiveness and operational improvement of the suggested control scheme.","PeriodicalId":423870,"journal":{"name":"2015 International Conference on Clean Electrical Power (ICCEP)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128418435","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 : 2015-06-16DOI: 10.1109/ICCEP.2015.7177596
L. Palma
In this paper a power conditioning system based on a modular connection of Z-Source DC-DC converters is presented. The proposed structure presents advantages such as modularity, high voltage gain, and multiple independently controlled input terminals. All these make it suitable for application in PV power plants, especially in cases where large arrays are required in which having the ability of independently following the maximum power point of different array sections is desirable. Moreover it is shown that the proposed structure can continue operation even if faulty modules are present in the power conditioner. Theoretical analysis of the operation of Z-Source DC-DC converter is performed and simulations of a 1 [kW] five module power conditioning system presented.
{"title":"Modular Z-source DC-DC converter based multilevel power conditioning system for PV applications","authors":"L. Palma","doi":"10.1109/ICCEP.2015.7177596","DOIUrl":"https://doi.org/10.1109/ICCEP.2015.7177596","url":null,"abstract":"In this paper a power conditioning system based on a modular connection of Z-Source DC-DC converters is presented. The proposed structure presents advantages such as modularity, high voltage gain, and multiple independently controlled input terminals. All these make it suitable for application in PV power plants, especially in cases where large arrays are required in which having the ability of independently following the maximum power point of different array sections is desirable. Moreover it is shown that the proposed structure can continue operation even if faulty modules are present in the power conditioner. Theoretical analysis of the operation of Z-Source DC-DC converter is performed and simulations of a 1 [kW] five module power conditioning system presented.","PeriodicalId":423870,"journal":{"name":"2015 International Conference on Clean Electrical Power (ICCEP)","volume":"440 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129408966","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 : 2015-06-16DOI: 10.1109/ICCEP.2015.7177620
Benjamin Grichting, J. Goette, M. Jacomet
Arc faults in photo-voltaic (Pv) systems are dangerous events and can create huge damage. In order to decrease the number of these events, arc fault detectors are used. The advantages of the here presented detection algorithm are the relatively low computational demand and the ability to work with most standard analog-digital converter (Adc) contained in micro controllers.
{"title":"Cascaded fuzzy logic based arc fault detection in photovoltaic applications","authors":"Benjamin Grichting, J. Goette, M. Jacomet","doi":"10.1109/ICCEP.2015.7177620","DOIUrl":"https://doi.org/10.1109/ICCEP.2015.7177620","url":null,"abstract":"Arc faults in photo-voltaic (Pv) systems are dangerous events and can create huge damage. In order to decrease the number of these events, arc fault detectors are used. The advantages of the here presented detection algorithm are the relatively low computational demand and the ability to work with most standard analog-digital converter (Adc) contained in micro controllers.","PeriodicalId":423870,"journal":{"name":"2015 International Conference on Clean Electrical Power (ICCEP)","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114680141","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 : 2015-06-16DOI: 10.1109/ICCEP.2015.7177583
G. Campobello, S. de Caro, O. Giordano, A. Russo, A. Segreto, S. Serrano, T. Scimone, A. Testa
The paper describes a simulation framework able to accomplish a simulation of a PV plants including a Wireless Sensor Network (WSN). The developed framework is entirely implemented in a Matlab/Simulink environment, and can be used to accomplish in-depth performance evaluation of two very different systems interacting between them, the power generator and the wireless data transfer network. As an example, the developed framework is exploited to investigate the effects of possible data losses, or delays, on the efficiency of a PV generator based on the Module Integrated Converter concept and equipped with a centralized MPPT system exploiting a WSN to monitor PV modules electric variables and the distribution of solar irradiation and temperature over the plant area.
{"title":"Efficiency assessment of MIC PV plants using Wireless Sensor Networks","authors":"G. Campobello, S. de Caro, O. Giordano, A. Russo, A. Segreto, S. Serrano, T. Scimone, A. Testa","doi":"10.1109/ICCEP.2015.7177583","DOIUrl":"https://doi.org/10.1109/ICCEP.2015.7177583","url":null,"abstract":"The paper describes a simulation framework able to accomplish a simulation of a PV plants including a Wireless Sensor Network (WSN). The developed framework is entirely implemented in a Matlab/Simulink environment, and can be used to accomplish in-depth performance evaluation of two very different systems interacting between them, the power generator and the wireless data transfer network. As an example, the developed framework is exploited to investigate the effects of possible data losses, or delays, on the efficiency of a PV generator based on the Module Integrated Converter concept and equipped with a centralized MPPT system exploiting a WSN to monitor PV modules electric variables and the distribution of solar irradiation and temperature over the plant area.","PeriodicalId":423870,"journal":{"name":"2015 International Conference on Clean Electrical Power (ICCEP)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114718045","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 : 2015-06-16DOI: 10.1109/ICCEP.2015.7177607
S. Vergura, A. M. Pavan
Modelling of PhotoVoltaic (PV) devices is today used for a number of activities such as systems monitoring, power forecasting, fault diagnosis, etc. Explicit empirical models based on the datasheet parameters are quite easy to implement in computer-aided calculations and therefore they allow fast evaluations of the electrical behavior, whatever is the test condition (steady-state, transient, etc.). This paper focus on the introduction of a correction factor for one of these models in order to improve its performance for operating points different than maximum power point (MPP). The comparison between the current-voltage (I-V) characteristics predicted by the former and the proposed models clearly shows the effectiveness of the proposed correction factors. The model is tested for different environment conditions and for different materials constituting the PV cells.
{"title":"On the photovoltaic explicit empirical model: Operations along the current-voltage curve","authors":"S. Vergura, A. M. Pavan","doi":"10.1109/ICCEP.2015.7177607","DOIUrl":"https://doi.org/10.1109/ICCEP.2015.7177607","url":null,"abstract":"Modelling of PhotoVoltaic (PV) devices is today used for a number of activities such as systems monitoring, power forecasting, fault diagnosis, etc. Explicit empirical models based on the datasheet parameters are quite easy to implement in computer-aided calculations and therefore they allow fast evaluations of the electrical behavior, whatever is the test condition (steady-state, transient, etc.). This paper focus on the introduction of a correction factor for one of these models in order to improve its performance for operating points different than maximum power point (MPP). The comparison between the current-voltage (I-V) characteristics predicted by the former and the proposed models clearly shows the effectiveness of the proposed correction factors. The model is tested for different environment conditions and for different materials constituting the PV cells.","PeriodicalId":423870,"journal":{"name":"2015 International Conference on Clean Electrical Power (ICCEP)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126752457","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 : 2015-06-16DOI: 10.1109/ICCEP.2015.7177627
E. Kouhiisfahani, A. Samieipour, T. Morawietz, J. Kraut, R. Hiesgen, D. Meissner
The paper reports first results of research aiming at the preparation of ionically conductive monograin membranes for photoelectrochemical solar energy storage. Polyurethane and PFSA solutions have been mixed to prepare composite membranes which in it's polyurethane part allow for the fixation of semiconductor single crystalline grains, while the PFSA component should allow for the establishment of ionically conductive pathways for ions through the membranes. This goal was achieved at least partly as is demonstrated by the conductivity results obtained. Although, the membranes change considerably with respect to their mechanical appearance.
{"title":"CZTS monograin membranes for photoelectrochemical fuel production modifications for fuel production","authors":"E. Kouhiisfahani, A. Samieipour, T. Morawietz, J. Kraut, R. Hiesgen, D. Meissner","doi":"10.1109/ICCEP.2015.7177627","DOIUrl":"https://doi.org/10.1109/ICCEP.2015.7177627","url":null,"abstract":"The paper reports first results of research aiming at the preparation of ionically conductive monograin membranes for photoelectrochemical solar energy storage. Polyurethane and PFSA solutions have been mixed to prepare composite membranes which in it's polyurethane part allow for the fixation of semiconductor single crystalline grains, while the PFSA component should allow for the establishment of ionically conductive pathways for ions through the membranes. This goal was achieved at least partly as is demonstrated by the conductivity results obtained. Although, the membranes change considerably with respect to their mechanical appearance.","PeriodicalId":423870,"journal":{"name":"2015 International Conference on Clean Electrical Power (ICCEP)","volume":"593 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115105057","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 : 2015-06-16DOI: 10.1109/ICCEP.2015.7177659
K. Hurayb, Y. Moumouni, F. A. Anon da Silva, Y. Baghzouz
Partial shading on a solar photovoltaic (PV) array is known to have a significant impact on its energy yield. This paper presents experimental measurements on a 2 kW grid-tied PV array under different shading profiles that are caused by structures of various shapes at different times of the year. A simulation method that provides an accurate description of shadow movement of the simpler structure on the array surface at different times of the day is presented. While the shade geometry can be accurately predicted, lack of knowledge about the relative amount of sunlight received by the most shaded cell in each group of cells in shunt with bypass diodes limits the simulation tool from determining the impact on the I-V and P-V curves of the array.
{"title":"Evaluation of the impact of partial shading on the performance of a grid-tied photovoltaic system","authors":"K. Hurayb, Y. Moumouni, F. A. Anon da Silva, Y. Baghzouz","doi":"10.1109/ICCEP.2015.7177659","DOIUrl":"https://doi.org/10.1109/ICCEP.2015.7177659","url":null,"abstract":"Partial shading on a solar photovoltaic (PV) array is known to have a significant impact on its energy yield. This paper presents experimental measurements on a 2 kW grid-tied PV array under different shading profiles that are caused by structures of various shapes at different times of the year. A simulation method that provides an accurate description of shadow movement of the simpler structure on the array surface at different times of the day is presented. While the shade geometry can be accurately predicted, lack of knowledge about the relative amount of sunlight received by the most shaded cell in each group of cells in shunt with bypass diodes limits the simulation tool from determining the impact on the I-V and P-V curves of the array.","PeriodicalId":423870,"journal":{"name":"2015 International Conference on Clean Electrical Power (ICCEP)","volume":"343 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126030609","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 : 2015-06-16DOI: 10.1109/ICCEP.2015.7177651
G. Pecoraro, S. Favuzza, M. Ippolito, G. Galioto, E. R. Sanseverino, E. Telaretti, G. Zizzo
The energy market has changed radically over the last decade, mainly due to an increased penetration of renewable energies. Now the end users have directly access to the energy market and can actively take part to the electricity market. Electricity customers can indeed modify their behavior through Demand Response (DR), namely by means of pricing strategies that support a change in the end-users habits. This can be accomplished through a "loads aggregator", a third party that collects the requests and signals for Active Demand-based services coming from the markets and the different power system participants. This paper describes a new framework able to optimally select the real-time pricing curves for the electricity customers. The algorithm uses a constrained optimization problem to generates the output curves, by using as objective function the aggregator's economic benefit maximization. A case study is performed to show the advantages/disadvantages of the proposed approach.
{"title":"Optimal pricing strategies in real-time electricity pricing environments: An Italian case study","authors":"G. Pecoraro, S. Favuzza, M. Ippolito, G. Galioto, E. R. Sanseverino, E. Telaretti, G. Zizzo","doi":"10.1109/ICCEP.2015.7177651","DOIUrl":"https://doi.org/10.1109/ICCEP.2015.7177651","url":null,"abstract":"The energy market has changed radically over the last decade, mainly due to an increased penetration of renewable energies. Now the end users have directly access to the energy market and can actively take part to the electricity market. Electricity customers can indeed modify their behavior through Demand Response (DR), namely by means of pricing strategies that support a change in the end-users habits. This can be accomplished through a \"loads aggregator\", a third party that collects the requests and signals for Active Demand-based services coming from the markets and the different power system participants. This paper describes a new framework able to optimally select the real-time pricing curves for the electricity customers. The algorithm uses a constrained optimization problem to generates the output curves, by using as objective function the aggregator's economic benefit maximization. A case study is performed to show the advantages/disadvantages of the proposed approach.","PeriodicalId":423870,"journal":{"name":"2015 International Conference on Clean Electrical Power (ICCEP)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124819647","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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