Ponències/Comunicacions de congressos
http://hdl.handle.net/2117/3671
2024-03-19T11:10:49Z
2024-03-19T11:10:49Z
Passivity based control of four-switch buck-boost DC-DC converter without operation mode detection
Komurcugil, Hasan
Bayhan, Sertac
Guler, Naki
Guzmán Solà, Ramon
http://hdl.handle.net/2117/385136
2023-03-17T10:20:24Z
2023-03-17T10:14:51Z
Passivity based control of four-switch buck-boost DC-DC converter without operation mode detection
Komurcugil, Hasan; Bayhan, Sertac; Guler, Naki; Guzmán Solà, Ramon
This paper presents a passivity-based control approach for four-switch buck-boost (FSBB) DC-DC converters. The state variables are selected as the inductor current and the capacitor voltage errors. The passivity based control is formulated that targets to drive the inductor current and capacitor voltage to their reference values. The reference of the inductor current is produced by a proportional-integral controller that operates on the capacitor voltage error. Two control input equations are defined for buck and boost operations due to the fact that FSBB converter contains separate switches for buck and boost stages. As a consequence of controlling each stage by the dedicated control input, the passivity based control method eliminates the need for using a mode detection algorithm. The validity and superiority of the proposed approach has been studied by Matlab/Simulink simulations under load step, reference voltage step and operation mode variations for buck and boost modes. The results reveal that the proposed control approach can regulate the output voltage under all cases.
2023-03-17T10:14:51Z
Komurcugil, Hasan
Bayhan, Sertac
Guler, Naki
Guzmán Solà, Ramon
This paper presents a passivity-based control approach for four-switch buck-boost (FSBB) DC-DC converters. The state variables are selected as the inductor current and the capacitor voltage errors. The passivity based control is formulated that targets to drive the inductor current and capacitor voltage to their reference values. The reference of the inductor current is produced by a proportional-integral controller that operates on the capacitor voltage error. Two control input equations are defined for buck and boost operations due to the fact that FSBB converter contains separate switches for buck and boost stages. As a consequence of controlling each stage by the dedicated control input, the passivity based control method eliminates the need for using a mode detection algorithm. The validity and superiority of the proposed approach has been studied by Matlab/Simulink simulations under load step, reference voltage step and operation mode variations for buck and boost modes. The results reveal that the proposed control approach can regulate the output voltage under all cases.
Mitigation of voltage sags with electric-vehicle based microgrids in large parking lots
Castilla Fernández, Miguel
Miret Tomàs, Jaume
Borrell Sanz, Angel
http://hdl.handle.net/2117/381059
2023-01-25T07:40:15Z
2023-01-25T07:30:17Z
Mitigation of voltage sags with electric-vehicle based microgrids in large parking lots
Castilla Fernández, Miguel; Miret Tomàs, Jaume; Borrell Sanz, Angel
This paper presents a real-time control strategy for electric-vehicle based microgrids to mitigate voltage sags in large parking lots. It is programmed into the digital processors of the battery chargers and consists on the injection of reactive current by both positive- and negative sequence components. As main characteristics, it should be noted that the control strategy can function correctly during both balanced and unbalanced voltage sags and is an economical solution since it does not require the inclusion of additional power converters to improve power quality. This study also looks at the ability to mitigate voltage sags based on the number of parked vehicles.
2023-01-25T07:30:17Z
Castilla Fernández, Miguel
Miret Tomàs, Jaume
Borrell Sanz, Angel
This paper presents a real-time control strategy for electric-vehicle based microgrids to mitigate voltage sags in large parking lots. It is programmed into the digital processors of the battery chargers and consists on the injection of reactive current by both positive- and negative sequence components. As main characteristics, it should be noted that the control strategy can function correctly during both balanced and unbalanced voltage sags and is an economical solution since it does not require the inclusion of additional power converters to improve power quality. This study also looks at the ability to mitigate voltage sags based on the number of parked vehicles.
Optimizing voltage support using electric vehicles in an islanded microgrid under voltage sags
Miret Tomàs, Jaume
Castilla Fernández, Miguel
Borrell Sanz, Àngel
http://hdl.handle.net/2117/380681
2023-01-18T12:10:17Z
2023-01-18T12:05:32Z
Optimizing voltage support using electric vehicles in an islanded microgrid under voltage sags
Miret Tomàs, Jaume; Castilla Fernández, Miguel; Borrell Sanz, Àngel
The number of electric vehicles connected to the grid is growing constantly due to environmental and regulatory issues. Using these connected vehicles as distributed generators is a promising future functionality, known as vehicle to grid concept. When connected to an islanded microgrid, the electric vehicles can collaborate to support the overall system stability. Specially during grid faults, as voltage sags or over currents, when electric vehicles can mimic the low voltage ride through protocols required to distributed generators. This work deals with an islanded microgrid with electric vehicles injecting reactive power when a sag occurs. The control proposal has three main objectives: from the microgrid point of view, it provides optimized voltage support reducing the voltage unbalance and avoids over voltages in the less faulty phases; from electric vehicle point of view, it avoids active power oscillations which affects positively to the lifespan of the electric vehicle charger-components. Selected experimental results demonstrate the effectiveness of the control proposal.
© 2022 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
2023-01-18T12:05:32Z
Miret Tomàs, Jaume
Castilla Fernández, Miguel
Borrell Sanz, Àngel
The number of electric vehicles connected to the grid is growing constantly due to environmental and regulatory issues. Using these connected vehicles as distributed generators is a promising future functionality, known as vehicle to grid concept. When connected to an islanded microgrid, the electric vehicles can collaborate to support the overall system stability. Specially during grid faults, as voltage sags or over currents, when electric vehicles can mimic the low voltage ride through protocols required to distributed generators. This work deals with an islanded microgrid with electric vehicles injecting reactive power when a sag occurs. The control proposal has three main objectives: from the microgrid point of view, it provides optimized voltage support reducing the voltage unbalance and avoids over voltages in the less faulty phases; from electric vehicle point of view, it avoids active power oscillations which affects positively to the lifespan of the electric vehicle charger-components. Selected experimental results demonstrate the effectiveness of the control proposal.
Voltage support using electric vehicles in an islanded resistive-microgrid under voltage sags
Miret Tomàs, Jaume
Castilla Fernández, Miguel
Borrell Sanz, Àngel
http://hdl.handle.net/2117/380680
2023-01-18T12:00:26Z
2023-01-18T11:58:16Z
Voltage support using electric vehicles in an islanded resistive-microgrid under voltage sags
Miret Tomàs, Jaume; Castilla Fernández, Miguel; Borrell Sanz, Àngel
The number of electric vehicles connected to the grid is growing constantly due to environmental and regulatory issues. Conventionally these vehicles work as variable loads, although using them as distributed generators is a promising future functionality, known as vehicle to grid concept. Using vehicle to grid capacities to support the grid during voltage sags, emulating Low Voltage Ride Through protocols, have been studied extensively, also in the field of islanded microgrids based on power electronics converters. This work proposes a change of paradigm for low voltage islanded microgrids, where the network impedances are mainly resistive. Instead of injecting reactive currents during the sag, this work proposes the injection of unbalanced active currents with two main objectives. First, support the microgrid voltage prioritizing in the reduction of voltage unbalance to avoid over voltages in the less faulty phases. And second, collaborate in the active power injection with the distributed generators to supply the over currents that demands the system during short circuits which produce voltage sags. Selected simulation results demonstrate the effectiveness of the control proposal.
© 2022 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
2023-01-18T11:58:16Z
Miret Tomàs, Jaume
Castilla Fernández, Miguel
Borrell Sanz, Àngel
The number of electric vehicles connected to the grid is growing constantly due to environmental and regulatory issues. Conventionally these vehicles work as variable loads, although using them as distributed generators is a promising future functionality, known as vehicle to grid concept. Using vehicle to grid capacities to support the grid during voltage sags, emulating Low Voltage Ride Through protocols, have been studied extensively, also in the field of islanded microgrids based on power electronics converters. This work proposes a change of paradigm for low voltage islanded microgrids, where the network impedances are mainly resistive. Instead of injecting reactive currents during the sag, this work proposes the injection of unbalanced active currents with two main objectives. First, support the microgrid voltage prioritizing in the reduction of voltage unbalance to avoid over voltages in the less faulty phases. And second, collaborate in the active power injection with the distributed generators to supply the over currents that demands the system during short circuits which produce voltage sags. Selected simulation results demonstrate the effectiveness of the control proposal.
Proposal of novel single-phase power quality indicators considering subsynchronous frequency perturbations in voltage and current under non-sinusoidal conditions
El Mariachet Carreño, Jordi
Matas Alcalá, José
Martín Cañadas, María Elena
Tinoco, G.
Abdalinejad, S.
http://hdl.handle.net/2117/168108
2021-07-21T17:09:30Z
2019-09-10T13:07:39Z
Proposal of novel single-phase power quality indicators considering subsynchronous frequency perturbations in voltage and current under non-sinusoidal conditions
El Mariachet Carreño, Jordi; Matas Alcalá, José; Martín Cañadas, María Elena; Tinoco, G.; Abdalinejad, S.
This work pretends to reconsider power quality (PQ), in AC single-phase low voltage systems, considering perturbation sources with frequency components below the fundamental frequency in voltage and current signals. These perturbations induced by sources like Geomagnetic Induced Currents (GMC), Arc Furnaces, switching VSC, etc. [1]-[2],[30]-[32], can occur in a frequency range comprised between DC and the fundamental frequency of the system. Standard PQ indexes do not characterize properly these subsynchronous frequency perturbations (SFFP), [2]-[3] and this work pretends to analyze the spectra from 0 to 50Hz for voltage and current, proposing new formulation for some PQ as a function of SSFP, with the intention of explaining the observed degradation of the power quality in single-phase low voltage electric systems.
2019-09-10T13:07:39Z
El Mariachet Carreño, Jordi
Matas Alcalá, José
Martín Cañadas, María Elena
Tinoco, G.
Abdalinejad, S.
This work pretends to reconsider power quality (PQ), in AC single-phase low voltage systems, considering perturbation sources with frequency components below the fundamental frequency in voltage and current signals. These perturbations induced by sources like Geomagnetic Induced Currents (GMC), Arc Furnaces, switching VSC, etc. [1]-[2],[30]-[32], can occur in a frequency range comprised between DC and the fundamental frequency of the system. Standard PQ indexes do not characterize properly these subsynchronous frequency perturbations (SFFP), [2]-[3] and this work pretends to analyze the spectra from 0 to 50Hz for voltage and current, proposing new formulation for some PQ as a function of SSFP, with the intention of explaining the observed degradation of the power quality in single-phase low voltage electric systems.
Multi-layer active power and frequency control strategy for industrial microgrids
Rey, Juan Manuel
Solano, Javier
Torres Martínez, Javier
Miret Tomàs, Jaume
Ghahderijani, Mohammad Moradi
Castilla Fernández, Miguel
http://hdl.handle.net/2117/123046
2022-05-22T08:32:54Z
2018-10-26T07:28:43Z
Multi-layer active power and frequency control strategy for industrial microgrids
Rey, Juan Manuel; Solano, Javier; Torres Martínez, Javier; Miret Tomàs, Jaume; Ghahderijani, Mohammad Moradi; Castilla Fernández, Miguel
Industrial microgrids require control strategies that guarantee high reliability and power quality. In this paper a multi-layer active power and frequency control strategy for industrial microgrids is presented. It is composed by a threelayer hierarchical scheme. The first control layer is based on the droop method. The secondary control layer is based on an eventdriven communication scheme that launches a protocol which controls the secondary terms. The tertiary control layer calculates an optimal economical dispatch. The proposed control guarantees an excellent performance in terms of frequency restoration and power sharing. Experimental results obtained on a laboratory microgrid are presented to validate the performance of the proposed control scheme.
© 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes,creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
2018-10-26T07:28:43Z
Rey, Juan Manuel
Solano, Javier
Torres Martínez, Javier
Miret Tomàs, Jaume
Ghahderijani, Mohammad Moradi
Castilla Fernández, Miguel
Industrial microgrids require control strategies that guarantee high reliability and power quality. In this paper a multi-layer active power and frequency control strategy for industrial microgrids is presented. It is composed by a threelayer hierarchical scheme. The first control layer is based on the droop method. The secondary control layer is based on an eventdriven communication scheme that launches a protocol which controls the secondary terms. The tertiary control layer calculates an optimal economical dispatch. The proposed control guarantees an excellent performance in terms of frequency restoration and power sharing. Experimental results obtained on a laboratory microgrid are presented to validate the performance of the proposed control scheme.
A communication-less control scheme for a variable air-gap wireless energy transfer system using current source resonant converter
Ghahderijani, Mohammad Moradi
Castilla Fernández, Miguel
Rey López, Juan Manuel
Torres Martínez, Javier
Garnica López, Miguel Andrés
http://hdl.handle.net/2117/123044
2022-05-22T08:26:59Z
2018-10-26T07:19:53Z
A communication-less control scheme for a variable air-gap wireless energy transfer system using current source resonant converter
Ghahderijani, Mohammad Moradi; Castilla Fernández, Miguel; Rey López, Juan Manuel; Torres Martínez, Javier; Garnica López, Miguel Andrés
This paper presents a robust control method for wireless energy transfer systems using current source resonant converter without any communication network. The proposed control strategy is valid even for systems with variable air-gap. Output voltage regulation, resonant frequency tracking and zero voltage switching condition are the main control objectives. The control strategy includes a simple modulation technique for the primary side class-D inverter and a sliding mode controller for the secondary-side full-bridge rectifier. Theoretical features of the presented control system are tested by some selected simulation results.
© 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes,creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
2018-10-26T07:19:53Z
Ghahderijani, Mohammad Moradi
Castilla Fernández, Miguel
Rey López, Juan Manuel
Torres Martínez, Javier
Garnica López, Miguel Andrés
This paper presents a robust control method for wireless energy transfer systems using current source resonant converter without any communication network. The proposed control strategy is valid even for systems with variable air-gap. Output voltage regulation, resonant frequency tracking and zero voltage switching condition are the main control objectives. The control strategy includes a simple modulation technique for the primary side class-D inverter and a sliding mode controller for the secondary-side full-bridge rectifier. Theoretical features of the presented control system are tested by some selected simulation results.
Experimental study of clock drift impact over droop-free distributed control for industrial microgrids
Torres Martínez, Javier
Castilla Fernández, Miguel
Miret Tomàs, Jaume
Ghahderijani, Mohammad Moradi
Rey López, Juan Manuel
http://hdl.handle.net/2117/123043
2022-05-22T03:25:55Z
2018-10-26T07:06:45Z
Experimental study of clock drift impact over droop-free distributed control for industrial microgrids
Torres Martínez, Javier; Castilla Fernández, Miguel; Miret Tomàs, Jaume; Ghahderijani, Mohammad Moradi; Rey López, Juan Manuel
It is well-know that in systems composed of several digital processors, clock signals of individual units differ from each other due to clock drifts. This paper investigates the effect of clock drifts from voltage source inverters (VSI) in industrial microgrids. Particularly, a primary/secondary droopfree distributed control scheme is considered in order to evaluate its robustness against clock drifts. The study is carried out by fully experimental means using a laboratory microgrid.
© 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
2018-10-26T07:06:45Z
Torres Martínez, Javier
Castilla Fernández, Miguel
Miret Tomàs, Jaume
Ghahderijani, Mohammad Moradi
Rey López, Juan Manuel
It is well-know that in systems composed of several digital processors, clock signals of individual units differ from each other due to clock drifts. This paper investigates the effect of clock drifts from voltage source inverters (VSI) in industrial microgrids. Particularly, a primary/secondary droopfree distributed control scheme is considered in order to evaluate its robustness against clock drifts. The study is carried out by fully experimental means using a laboratory microgrid.
Control scheme for a multiple-output DC/DC current source parallel resonant converter
Ghahderijani, Mohammad Moradi
Castilla Fernández, Miguel
Miret Tomàs, Jaume
Guzmán Solà, Ramon
Rey López, Juan Manuel
http://hdl.handle.net/2117/123041
2022-05-17T10:32:22Z
2018-10-26T06:57:53Z
Control scheme for a multiple-output DC/DC current source parallel resonant converter
Ghahderijani, Mohammad Moradi; Castilla Fernández, Miguel; Miret Tomàs, Jaume; Guzmán Solà, Ramon; Rey López, Juan Manuel
The aim of this paper is to regulate the output voltages of a multiple-output DC/DC class-D current source parallel resonant converter. To this end, a sliding mode control scheme is presented consisting of an outer voltage loop, an inner current loop and a robust modulator. To devise this control scheme, the averaged large signal model of the converter is derived. In addition, this model is used to determine the stability range of the controller parameters. Some simulation results are provided to validate the expected features of the presented control configuration.
© 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
2018-10-26T06:57:53Z
Ghahderijani, Mohammad Moradi
Castilla Fernández, Miguel
Miret Tomàs, Jaume
Guzmán Solà, Ramon
Rey López, Juan Manuel
The aim of this paper is to regulate the output voltages of a multiple-output DC/DC class-D current source parallel resonant converter. To this end, a sliding mode control scheme is presented consisting of an outer voltage loop, an inner current loop and a robust modulator. To devise this control scheme, the averaged large signal model of the converter is derived. In addition, this model is used to determine the stability range of the controller parameters. Some simulation results are provided to validate the expected features of the presented control configuration.
Consensus for active power sharing and frequency restoration in islanded microgrids subject to drifting clocks
Rosero Chandi, Carlos Xavier
Martí Colom, Pau
Velasco García, Manel
Castilla Fernández, Miguel
Miret Tomàs, Jaume
Camacho Santiago, Antonio
http://hdl.handle.net/2117/123040
2022-05-22T04:41:47Z
2018-10-26T06:37:08Z
Consensus for active power sharing and frequency restoration in islanded microgrids subject to drifting clocks
Rosero Chandi, Carlos Xavier; Martí Colom, Pau; Velasco García, Manel; Castilla Fernández, Miguel; Miret Tomàs, Jaume; Camacho Santiago, Antonio
The application of consensus theory in the control of islanded microgrids (MG) is gaining increased attention because it facilitates the development of distributed control solutions. In particular, its application to active power sharing and frequency regulation has lead to satisfactory results. This paper analyses the effect that local clock drifts have in the parallel operation of voltage source inverters (VSIs) in islanded microgrids (MG) when governed by a distributed consensus algorithm. Analytical expressions that relate the steady-state frequency and active power as a function of each VSI local drift are provided. These expressions allow extracting tuning rules for the consensus-based control algorithm. Simulation results permit corroborating the theoretical analysis.
© 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
2018-10-26T06:37:08Z
Rosero Chandi, Carlos Xavier
Martí Colom, Pau
Velasco García, Manel
Castilla Fernández, Miguel
Miret Tomàs, Jaume
Camacho Santiago, Antonio
The application of consensus theory in the control of islanded microgrids (MG) is gaining increased attention because it facilitates the development of distributed control solutions. In particular, its application to active power sharing and frequency regulation has lead to satisfactory results. This paper analyses the effect that local clock drifts have in the parallel operation of voltage source inverters (VSIs) in islanded microgrids (MG) when governed by a distributed consensus algorithm. Analytical expressions that relate the steady-state frequency and active power as a function of each VSI local drift are provided. These expressions allow extracting tuning rules for the consensus-based control algorithm. Simulation results permit corroborating the theoretical analysis.