ACES - Control Avançat de Sistemes d'Energia
http://hdl.handle.net/2117/114
2024-03-28T09:21:22Z
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Current-limited suboptimal sliding mode control for voltage-regulated synchronous buck converters
http://hdl.handle.net/2117/368256
Current-limited suboptimal sliding mode control for voltage-regulated synchronous buck converters
Ramos Lara, Rafael Ramón; Repecho del Corral, Víctor; Biel Solé, Domingo
This paper proposes a new sliding mode control based on a non-linear switching surface that provides a suboptimal current-limited start-up response in step-down converters. The main idea behind the design consists in combining different switching surfaces. The first one forces the system trajectories to track a constant current path until the output voltage error is small. A non-singular terminal switching surface then drives the trajectories to the vicinity of the steady state operating point. Finally, a first order switching surface regulates the steady state providing very good rates of load and line regulation. The paper presents the design guidelines of the suboptimal sliding mode control and the experimental evaluation that confirms the effectiveness of the 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
2022-06-10T08:32:33Z
Ramos Lara, Rafael Ramón
Repecho del Corral, Víctor
Biel Solé, Domingo
This paper proposes a new sliding mode control based on a non-linear switching surface that provides a suboptimal current-limited start-up response in step-down converters. The main idea behind the design consists in combining different switching surfaces. The first one forces the system trajectories to track a constant current path until the output voltage error is small. A non-singular terminal switching surface then drives the trajectories to the vicinity of the steady state operating point. Finally, a first order switching surface regulates the steady state providing very good rates of load and line regulation. The paper presents the design guidelines of the suboptimal sliding mode control and the experimental evaluation that confirms the effectiveness of the proposal.
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Zero speed sensorless scheme for permanent magnet synchronous machine under decoupled sliding-mode control
http://hdl.handle.net/2117/368077
Zero speed sensorless scheme for permanent magnet synchronous machine under decoupled sliding-mode control
Repecho del Corral, Víctor; Biel Solé, Domingo; Dòria Cerezo, Arnau
Position estimation at low/zero speed for permanent magnet synchronous machines is commonly achieved with the injection of high-frequency signals. This article presents a new sensorless scheme that accurately observe the rotor angle at low speeds, including standstill condition, without injecting high-frequency signals. The algorithm is built upon a previous sliding-mode current controller and uses the switching functions slopes inaccuracies produced by the saliency effect to determine the rotor position and speed. Thanks to the equivalent control concept and together with a sliding-mode-based phase-locked loop observer defined by a complex switching function, the algorithm provides both rotor position and speed in a compact form. This article includes the main working principle and defines the operational range of the proposed scheme. Finally, the feasibility of the method is corroborated through experimental results in sensorless configuration.
© 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.
2022-06-07T11:44:35Z
Repecho del Corral, Víctor
Biel Solé, Domingo
Dòria Cerezo, Arnau
Position estimation at low/zero speed for permanent magnet synchronous machines is commonly achieved with the injection of high-frequency signals. This article presents a new sensorless scheme that accurately observe the rotor angle at low speeds, including standstill condition, without injecting high-frequency signals. The algorithm is built upon a previous sliding-mode current controller and uses the switching functions slopes inaccuracies produced by the saliency effect to determine the rotor position and speed. Thanks to the equivalent control concept and together with a sliding-mode-based phase-locked loop observer defined by a complex switching function, the algorithm provides both rotor position and speed in a compact form. This article includes the main working principle and defines the operational range of the proposed scheme. Finally, the feasibility of the method is corroborated through experimental results in sensorless configuration.
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Digital control of multiphase series capacitor buck converter prototype for the powering of HL-LHC inner triplet magnets
http://hdl.handle.net/2117/368059
Digital control of multiphase series capacitor buck converter prototype for the powering of HL-LHC inner triplet magnets
Ibarra Basabe, Edorta; Arias Pujol, Antoni; Martínez de Alegría, Iñigo; Otero, Alberto; de Mallac, Louis
A major upgrade will be conducted in the Large Hardon Collider (LHC) at CERN. This high-luminosity (HL) version of the LHC will increase the nominal luminosity by a factor of five. One of the key technologies of the HL-LHC is the new superconducting inner triplet (IT) magnets, responsible of producing high magnetic fields to focus particle beams. To power the IT magnets from the grid, a multistage power supply with an intermediate 24-V battery pack is being considered. In such topology, a low-voltage high-current dc/dc converter operating with a very high step-down ratio is required for the final conversion stage. In this work, an interleaved multiphase series capacitor buck converter is proposed to feed the IT magnets from the battery pack. A novel voltage regulation approach that ensures the current balance between the paralleled series capacitor cells is also proposed, where one cell is responsible for the output voltage regulation, while the remaining cells are current-regulated. A balanced current sharing between the series capacitor cells is achieved, when the current-controlled cells are referenced by the actual current of the first one. The proposal is theoretically analyzed and experimentally validated in a six-cell 1000-A prototype unit.
©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.
2022-06-07T08:03:22Z
Ibarra Basabe, Edorta
Arias Pujol, Antoni
Martínez de Alegría, Iñigo
Otero, Alberto
de Mallac, Louis
A major upgrade will be conducted in the Large Hardon Collider (LHC) at CERN. This high-luminosity (HL) version of the LHC will increase the nominal luminosity by a factor of five. One of the key technologies of the HL-LHC is the new superconducting inner triplet (IT) magnets, responsible of producing high magnetic fields to focus particle beams. To power the IT magnets from the grid, a multistage power supply with an intermediate 24-V battery pack is being considered. In such topology, a low-voltage high-current dc/dc converter operating with a very high step-down ratio is required for the final conversion stage. In this work, an interleaved multiphase series capacitor buck converter is proposed to feed the IT magnets from the battery pack. A novel voltage regulation approach that ensures the current balance between the paralleled series capacitor cells is also proposed, where one cell is responsible for the output voltage regulation, while the remaining cells are current-regulated. A balanced current sharing between the series capacitor cells is achieved, when the current-controlled cells are referenced by the actual current of the first one. The proposal is theoretically analyzed and experimentally validated in a six-cell 1000-A prototype unit.
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Comparison of first- and second-order sliding-mode controllers for a dc-dc dual active bridge
http://hdl.handle.net/2117/367787
Comparison of first- and second-order sliding-mode controllers for a dc-dc dual active bridge
Dòria Cerezo, Arnau; Serra, Federico; Esteban, Francisco Daniel; Biel Solé, Domingo; Griñó Cubero, Robert
This paper compares four sliding-mode control strategies for a dual active bridge. The proposed control algorithms define different switching functions resulting in first-and second-order controllers, and using both discontinuous and continuous sliding-mode algorithms. The paper details the design stage and includes simulation and experimental tests to better compare the performance for each control scheme.
2022-05-27T10:48:49Z
Dòria Cerezo, Arnau
Serra, Federico
Esteban, Francisco Daniel
Biel Solé, Domingo
Griñó Cubero, Robert
This paper compares four sliding-mode control strategies for a dual active bridge. The proposed control algorithms define different switching functions resulting in first-and second-order controllers, and using both discontinuous and continuous sliding-mode algorithms. The paper details the design stage and includes simulation and experimental tests to better compare the performance for each control scheme.
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Combined heat and power using high-temperature proton exchange membrane fuel cells for housing facilities
http://hdl.handle.net/2117/365085
Combined heat and power using high-temperature proton exchange membrane fuel cells for housing facilities
Sanz i López, Víctor; Lopez Diest, Guillermo; Costa Castelló, Ramon; Batlle Arnau, Carles
Recently, new alternatives to conventional energy sources such as fossil fuels are arising due to global problems related to climate change effect and energy shortage. In this context, fuel cells and combined heat and power technologies appear as a possible solution due to their ability to provide both electrical and thermal energy more efficiently compared to traditional methods. Related to this, high-temperature proton exchange membrane fuel cells offer the possibility of implementing combined heat and power systems, and they are also considered an efficient technology that emits less greenhouse gases. In this article a model predictive control based energy management system for a specific house is presented. Simulation and control models of the system are presented, together with dimensions and energy profiles used. Finally, control objectives and the proposed control algorithm are detailed, and the results when trying to match residential heat and power demands are discussed.
© 20xx 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.
2022-03-31T11:20:43Z
Sanz i López, Víctor
Lopez Diest, Guillermo
Costa Castelló, Ramon
Batlle Arnau, Carles
Recently, new alternatives to conventional energy sources such as fossil fuels are arising due to global problems related to climate change effect and energy shortage. In this context, fuel cells and combined heat and power technologies appear as a possible solution due to their ability to provide both electrical and thermal energy more efficiently compared to traditional methods. Related to this, high-temperature proton exchange membrane fuel cells offer the possibility of implementing combined heat and power systems, and they are also considered an efficient technology that emits less greenhouse gases. In this article a model predictive control based energy management system for a specific house is presented. Simulation and control models of the system are presented, together with dimensions and energy profiles used. Finally, control objectives and the proposed control algorithm are detailed, and the results when trying to match residential heat and power demands are discussed.
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Sliding modes in a class of complex-valued nonlinear systems
http://hdl.handle.net/2117/362087
Sliding modes in a class of complex-valued nonlinear systems
Dòria Cerezo, Arnau; Olm Miras, Josep Maria; Biel Solé, Domingo; Fossas Colet, Enric
A number of physical systems allow a complex-valued representation. This article extends the theory of sliding modes to a class of nonlinear systems described by complex-valued variables. Hence, states, parameters, control actions, and sliding manifolds belong, in general, to the complex field. In this article, it is also shown that the proposed design in the complex-valued framework provides shorter reaching times to the sliding manifold than the standard sliding-mode design at equal initial condition and control effort. Different implementation approaches are also evaluated, and numerical examples illustrate the proposal.
© 2021 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
2022-02-10T10:14:04Z
Dòria Cerezo, Arnau
Olm Miras, Josep Maria
Biel Solé, Domingo
Fossas Colet, Enric
A number of physical systems allow a complex-valued representation. This article extends the theory of sliding modes to a class of nonlinear systems described by complex-valued variables. Hence, states, parameters, control actions, and sliding manifolds belong, in general, to the complex field. In this article, it is also shown that the proposed design in the complex-valued framework provides shorter reaching times to the sliding manifold than the standard sliding-mode design at equal initial condition and control effort. Different implementation approaches are also evaluated, and numerical examples illustrate the proposal.
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A Multiple-Reference Complex-Based Controller for Power Converters
http://hdl.handle.net/2117/359904
A Multiple-Reference Complex-Based Controller for Power Converters
Serra, Federico; Dòria Cerezo, Arnau; Bodson, Marc
A multiple-reference complex-based controller is proposed for three-phase power converters feeding nonlinear and unbalanced loads. The control scheme incorporates a stable multiple-complex coefficient filter with bandwidths that are set arbitrarily and independently for every harmonic under consideration. The multiple-reference complex-based control scheme is applied to an uninterruptible power supply system with a voltage source converter. Each harmonic is controlled using a standard complex proportional-resonant controller that is designed for stability and robustness using the Nyquist criterion. Similar stability and robustness properties follow for the overall system due to the frequency-domain properties of the filter and of the controllers. The proposed methodology is validated in simulation and experimental tests.
2022-01-18T12:27:11Z
Serra, Federico
Dòria Cerezo, Arnau
Bodson, Marc
A multiple-reference complex-based controller is proposed for three-phase power converters feeding nonlinear and unbalanced loads. The control scheme incorporates a stable multiple-complex coefficient filter with bandwidths that are set arbitrarily and independently for every harmonic under consideration. The multiple-reference complex-based control scheme is applied to an uninterruptible power supply system with a voltage source converter. Each harmonic is controlled using a standard complex proportional-resonant controller that is designed for stability and robustness using the Nyquist criterion. Similar stability and robustness properties follow for the overall system due to the frequency-domain properties of the filter and of the controllers. The proposed methodology is validated in simulation and experimental tests.
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Three-phase phase-locked loop algorithms based on sliding modes
http://hdl.handle.net/2117/359814
Three-phase phase-locked loop algorithms based on sliding modes
Dòria Cerezo, Arnau; Repecho del Corral, Víctor; Biel Solé, Domingo
This article proposes a family of phase-locked loop schemes based on sliding modes. The use of sliding mode algorithms ensures fast response and global stability. In particular, two new algorithms are presented, both based on a complex framework for representing three-phase signals. This article compares the obtained algorithms with the traditional schemes, and a faster response is obtained when sliding modes are used. Additionally, as an application example, the algorithm is combined with a complex-coefficient filter that allows an easy identification of both positive and negative sequence harmonics. The proposed algorithms are illustrated by numerical simulations and experimentally validated using a digital signal processor.
© 2021 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
2022-01-17T09:22:00Z
Dòria Cerezo, Arnau
Repecho del Corral, Víctor
Biel Solé, Domingo
This article proposes a family of phase-locked loop schemes based on sliding modes. The use of sliding mode algorithms ensures fast response and global stability. In particular, two new algorithms are presented, both based on a complex framework for representing three-phase signals. This article compares the obtained algorithms with the traditional schemes, and a faster response is obtained when sliding modes are used. Additionally, as an application example, the algorithm is combined with a complex-coefficient filter that allows an easy identification of both positive and negative sequence harmonics. The proposed algorithms are illustrated by numerical simulations and experimentally validated using a digital signal processor.
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Mechanical sensor fault-tolerant controller in pmsm drive: experimental evaluation of observers and signal injection for position estimation
http://hdl.handle.net/2117/357054
Mechanical sensor fault-tolerant controller in pmsm drive: experimental evaluation of observers and signal injection for position estimation
Medjmadj, Slimane; Diallo, Demba; Arias Pujol, Antoni
This paper presents the operating principle, results and conclusions for a FTC mechanical sensor that can guarantee continuity of operation on the whole speed range. This active FTC is based on analytical redundancy using three different estimators (an Extended Kalman Filter (EKF), a back electromotive-force-based observer (Back-EMF Observer) and a high frequency voltage injection (HFI). Thanks to this structure, the mechanical measurement is continuously monitored and at sensor fault occurrence the sensorless controller can be engaged using the best estimate. From numerical simulations and experimental results on a 1.1kW salient PMSM drive, the following conclusion has been drawn: at low and zero speed, the drive availability is obtained with the combination of the EKF and the HFI while for higher speeds EKF and Back-EMF Observer have better performance.
2021-11-24T14:33:08Z
Medjmadj, Slimane
Diallo, Demba
Arias Pujol, Antoni
This paper presents the operating principle, results and conclusions for a FTC mechanical sensor that can guarantee continuity of operation on the whole speed range. This active FTC is based on analytical redundancy using three different estimators (an Extended Kalman Filter (EKF), a back electromotive-force-based observer (Back-EMF Observer) and a high frequency voltage injection (HFI). Thanks to this structure, the mechanical measurement is continuously monitored and at sensor fault occurrence the sensorless controller can be engaged using the best estimate. From numerical simulations and experimental results on a 1.1kW salient PMSM drive, the following conclusion has been drawn: at low and zero speed, the drive availability is obtained with the combination of the EKF and the HFI while for higher speeds EKF and Back-EMF Observer have better performance.
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Sliding mode control of a dc-dc dual active bridge using the generalized space-state averaging description
http://hdl.handle.net/2117/356841
Sliding mode control of a dc-dc dual active bridge using the generalized space-state averaging description
Dòria Cerezo, Arnau; Martin Serra, Federico; Biel Solé, Domingo; Griñó Cubero, Robert
This paper presents a sliding mode control strategy for a dc-dc dual active bridge converter. The controller is based on a truncated model obtained using the generalized state space averaging method that transforms the mixed dcac dynamics of the converter into a regulation problem. The proposed controller, that uses a dynamic extension to overcome the structural problem of the non-affine control input, provides good results in terms of performance and robustness. Numerical simulations are included to validate the proposed modelling methodology and the control design.
2021-11-22T11:54:56Z
Dòria Cerezo, Arnau
Martin Serra, Federico
Biel Solé, Domingo
Griñó Cubero, Robert
This paper presents a sliding mode control strategy for a dc-dc dual active bridge converter. The controller is based on a truncated model obtained using the generalized state space averaging method that transforms the mixed dcac dynamics of the converter into a regulation problem. The proposed controller, that uses a dynamic extension to overcome the structural problem of the non-affine control input, provides good results in terms of performance and robustness. Numerical simulations are included to validate the proposed modelling methodology and the control design.