The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Ivo Barbi - One of the best experts on this subject based on the ideXlab platform.
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a control strategy for Parallel Operation of single phase voltage source inverters analysis design and experimental results
IEEE Transactions on Industrial Electronics, 2013Co-Authors: Telles Brunelli Lazzarin, Guilherme A T Bauer, Ivo BarbiAbstract:This paper describes a theoretical and experimental study on a control strategy for the Parallel Operation of single-phase voltage source inverters (VSI), to be applied to uninterruptible power supply. The control system for each inverter consists of two main loops, which both use instantaneous values. The first (Parallelism control) employs the feedback of the inductor current from the output filter to modify the input voltage of the same filter and, therefore, to control the power flow of each inverter to the load. Additionally, the second loop (voltage control) is responsible for controlling the output voltage of the LC filter, which coincides with the output voltage of the VSI. Due to the fact that there is no exchange of information among the VSIs regarding their Operation points, it is easier to obtain redundant systems. Furthermore, the connection (or disconnection) of inverters in a Parallel arrangement is carried out directly, without connection impedance, and can occur at any Operation point of the system. The proposed control strategy ensures the proper sharing of the load current and avoids current circulation among the inverters during transient and steady-state Operation. Moreover, its design and implementation are very simple. The control technique was verified through experimental results with a maximum load of 10 kVA supplied by three Parallel-connected inverters.
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a control strategy by instantaneous average values for Parallel Operation of single phase voltage source inverters based in the inductor current feedback
Energy Conversion Congress and Exposition, 2009Co-Authors: Telles Brunelli Lazzarin, Guilherme A T Bauer, Ivo BarbiAbstract:This paper presents a simple, effective and robust control strategy applied to Parallel connected of single phase voltage source inverters. The Parallelism control is only done using internal measures of each inverter. The objective is to obtain a control system where the inverters are independent from each other. The proposed control strategy of each inverter has two control loops by instantaneous average values: one for voltage and another for current. The first one is designed to control the output voltage of the inverter, while the second is designed to lead the Parallel Operation of the inverters. The Parallelism control acts in the voltage before the LC filter and it is based on the feedback of the L inductor current. Its function is to guarantee the correct load current sharing. The control technique was corroborated through experimental results with a maximum load of 10 kVA supplied by three Parallel connected inverters.
Josep M Guerrero - One of the best experts on this subject based on the ideXlab platform.
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advanced synchronization control for inverters Parallel Operation in microgrids using coupled hopf oscillators
CPSS Transactions on Power Electronics and Applications, 2020Co-Authors: Baoze Wei, Josep M Guerrero, J Matas, Juan C VasquezAbstract:A simple high-performance decentralized controller based on Hopf oscillator is proposed for three-phase Parallel voltage source inverter (VSI) in islanded Microgrid. In αβ frame, the oscillators equations corresponding output current and common bus voltage as feedbacks are designed according to coupled oscillator synchronization properties. The enough common bus information is considered to realize external synchronization, and the current feedback is to achieve internal synchronization between VSIs. Then, the controller employs Hopf evolution dynamics to integrate their both. Therefore, a larger phase error can be eliminated when additional inverter connects, and the pre-synchronization item is proposed to be close to synchronize with the Operational inverters. In addition, an integrated small-signal states pace based on averaged model for two Parallel VSIs is developed, and the root locus shows the large stability margin and low sensitivity of parameters. Simulation and experiment results verified the effectiveness of the proposed method in aspects of the fast dynamics response and precise current sharing performance.
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multilayer control for inverters in Parallel Operation without intercommunications
IEEE Transactions on Power Electronics, 2012Co-Authors: Ming Hua, Yan Xing, Josep M GuerreroAbstract:In this paper, a multilayer control is proposed for inverters that are able to operate in Parallel without intercommunications. The first control layer is an improved droop method that introduces power proportional terms into the conventional droop scheme, letting both active and reactive power to be shared among the inverters. The second layer is designed to compensate the voltage deviations caused by the aforementioned droop control, thus improving the load-voltage regulation of the system. The third layer is a quasi-synchronization control that roughly adjusts the angle of the inverter to be close to the common ac bus. This layer ensures that the phase difference of each inverter is inside a limited margin with the help of the phase signal sensed from the common ac bus. The principle of Operation of the control scheme has been analyzed in detail. A small-signal model has been developed in order to study the system dynamics, which can be used for adjusting the main control parameters. A prototype consisting of a two 35-kVA-inverter system has been built and tested in order to verify the feasibility of the proposed approach.
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Parallel Operation of uninterruptible power supply systems in microgrids
European Conference on Power Electronics and Applications, 2007Co-Authors: Josep M Guerrero, J. L. Sosa, J Matas, Juan C Vasquez, L. Garcia De VicunaAbstract:In this paper, a control scheme applied to distributed UPSs forming a microgrid is proposed. The control architecture consists of two levels of hierarchy: 1) the P/Q droop control method of every UPS unit and 2) the management of the microgrid through the control of the setpoints of the units, and the connection or disconnection to the utility mains.
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decentralized control for Parallel Operation of distributed generation inverters using resistive output impedance
IEEE Transactions on Industrial Electronics, 2007Co-Authors: Josep M Guerrero, L. Garcia De Vicuna, Miguel Castilla, J Matas, Jaume MiretAbstract:In this paper, a novel wireless load-sharing controller for islanding Parallel inverters in an ac-distributed system is proposed. This paper explores the resistive output impedance of the Parallel-connected inverters in an island microgrid. The control loops are devised and analyzed, taking into account the special nature of a low-voltage microgrid, in which the line impedance is mainly resistive and the distance between the inverters makes the control intercommunication between them difficult. In contrast with the conventional droop-control method, the proposed controller uses resistive output impedance, and as a result, a different control law is obtained. The controller is implemented by using a digital signal processor board, which only uses local measurements of the unit, thus increasing the modularity, reliability, and flexibility of the distributed system. Experimental results are provided from two 6-kVA inverters connected in Parallel, showing the features of the proposed wireless control
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decentralized control for Parallel Operation of distributed generation inverters in microgrids using resistive output impedance
Conference of the Industrial Electronics Society, 2006Co-Authors: Josep M Guerrero, L. Garcia De Vicuna, N Berbel, J Matas, Jaume MiretAbstract:In this paper, a novel wireless load-sharing controller for islanding Parallel inverters in an ac-distributed system is proposed. The paper explores the resistive output impedance of the Parallel-connected inverters in an island microgrid. The control loops are devised and analyzed taking into account the special nature of a low voltage microgrid, in which the line impedance is mainly resistive and the distance between the inverters makes the control intercommunication between them difficult. In contrast with the conventional droop control method, the proposed controller uses resistive output impedance, and as a result a different control law is obtained. The controller is implemented by using a DSP board, which only uses local measurements of the unit, thus increasing the modularity, reliability, and flexibility of the distributed system. Experimental results are provided from two 6 kVA inverters connected in Parallel, showing the features of the proposed wireless control.
L. Garcia De Vicuna - One of the best experts on this subject based on the ideXlab platform.
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Parallel Operation of uninterruptible power supply systems in microgrids
European Conference on Power Electronics and Applications, 2007Co-Authors: Josep M Guerrero, J. L. Sosa, J Matas, Juan C Vasquez, L. Garcia De VicunaAbstract:In this paper, a control scheme applied to distributed UPSs forming a microgrid is proposed. The control architecture consists of two levels of hierarchy: 1) the P/Q droop control method of every UPS unit and 2) the management of the microgrid through the control of the setpoints of the units, and the connection or disconnection to the utility mains.
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decentralized control for Parallel Operation of distributed generation inverters using resistive output impedance
IEEE Transactions on Industrial Electronics, 2007Co-Authors: Josep M Guerrero, L. Garcia De Vicuna, Miguel Castilla, J Matas, Jaume MiretAbstract:In this paper, a novel wireless load-sharing controller for islanding Parallel inverters in an ac-distributed system is proposed. This paper explores the resistive output impedance of the Parallel-connected inverters in an island microgrid. The control loops are devised and analyzed, taking into account the special nature of a low-voltage microgrid, in which the line impedance is mainly resistive and the distance between the inverters makes the control intercommunication between them difficult. In contrast with the conventional droop-control method, the proposed controller uses resistive output impedance, and as a result, a different control law is obtained. The controller is implemented by using a digital signal processor board, which only uses local measurements of the unit, thus increasing the modularity, reliability, and flexibility of the distributed system. Experimental results are provided from two 6-kVA inverters connected in Parallel, showing the features of the proposed wireless control
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Droop Control Method with Virtual Output Impedance for Parallel Operation of Uninterruptible Power Supply Systems in a Microgrid
APEC 07 - Twenty-Second Annual IEEE Applied Power Electronics Conference and Exposition, 2007Co-Authors: J.m. Guerrero, José Matas, J. L. Sosa, N Berbel, L. Garcia De VicunaAbstract:In this paper, a novel droop control scheme applied to distributed UPSs forming a microgrid is proposed. The control architecture consists of two levels of hierarchy: 1) the P/Q droop control method of every UPS unit and 2) the management of the microgrid through the control of the setpoints of the units and the intelligent switch connected to the strong grid. This second level of control let us to connect or disconnect the microgrid to the utility mains, resulting in two scenarios: grid-connected and islanding Operation mode. Also, it is taken into account the seamlessly transition between both Operation modes, the possibility to share power with the utility grid, and the energy management of the overall system.
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decentralized control for Parallel Operation of distributed generation inverters in microgrids using resistive output impedance
Conference of the Industrial Electronics Society, 2006Co-Authors: Josep M Guerrero, L. Garcia De Vicuna, N Berbel, J Matas, Jaume MiretAbstract:In this paper, a novel wireless load-sharing controller for islanding Parallel inverters in an ac-distributed system is proposed. The paper explores the resistive output impedance of the Parallel-connected inverters in an island microgrid. The control loops are devised and analyzed taking into account the special nature of a low voltage microgrid, in which the line impedance is mainly resistive and the distance between the inverters makes the control intercommunication between them difficult. In contrast with the conventional droop control method, the proposed controller uses resistive output impedance, and as a result a different control law is obtained. The controller is implemented by using a DSP board, which only uses local measurements of the unit, thus increasing the modularity, reliability, and flexibility of the distributed system. Experimental results are provided from two 6 kVA inverters connected in Parallel, showing the features of the proposed wireless control.
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wireless control strategy for Parallel Operation of distributed generation inverters
IEEE Transactions on Industrial Electronics, 2006Co-Authors: Josep M Guerrero, L. Garcia De Vicuna, Miguel Castilla, J Matas, Jaume MiretAbstract:In this paper, a method for the Parallel Operation of inverters in an ac-distributed system is proposed. This paper explores the control of active and reactive power flow through the analysis of the output impedance of the inverters and its impact on the power sharing. As a result, adaptive virtual output impedance is proposed in order to achieve a proper reactive power sharing, regardless of the line-impedance unbalances. A soft-start Operation is also included, avoiding the initial current peak, which results in a seamless hot-swap Operation. Active power sharing is achieved by adjusting the frequency in load transient situations only, owing to which the proposed method obtains a constant steady-state frequency and amplitude. As opposed to the conventional droop method, the transient response can be modified by acting on the main control parameters. Linear and nonlinear loads can be properly shared due to the addition of a current harmonic loop in the control strategy. Experimental results are presented from a two-6-kVA Parallel-connected inverter system, showing the feasibility of the proposed approach
Telles Brunelli Lazzarin - One of the best experts on this subject based on the ideXlab platform.
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a control strategy for Parallel Operation of single phase voltage source inverters analysis design and experimental results
IEEE Transactions on Industrial Electronics, 2013Co-Authors: Telles Brunelli Lazzarin, Guilherme A T Bauer, Ivo BarbiAbstract:This paper describes a theoretical and experimental study on a control strategy for the Parallel Operation of single-phase voltage source inverters (VSI), to be applied to uninterruptible power supply. The control system for each inverter consists of two main loops, which both use instantaneous values. The first (Parallelism control) employs the feedback of the inductor current from the output filter to modify the input voltage of the same filter and, therefore, to control the power flow of each inverter to the load. Additionally, the second loop (voltage control) is responsible for controlling the output voltage of the LC filter, which coincides with the output voltage of the VSI. Due to the fact that there is no exchange of information among the VSIs regarding their Operation points, it is easier to obtain redundant systems. Furthermore, the connection (or disconnection) of inverters in a Parallel arrangement is carried out directly, without connection impedance, and can occur at any Operation point of the system. The proposed control strategy ensures the proper sharing of the load current and avoids current circulation among the inverters during transient and steady-state Operation. Moreover, its design and implementation are very simple. The control technique was verified through experimental results with a maximum load of 10 kVA supplied by three Parallel-connected inverters.
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a control strategy by instantaneous average values for Parallel Operation of single phase voltage source inverters based in the inductor current feedback
Energy Conversion Congress and Exposition, 2009Co-Authors: Telles Brunelli Lazzarin, Guilherme A T Bauer, Ivo BarbiAbstract:This paper presents a simple, effective and robust control strategy applied to Parallel connected of single phase voltage source inverters. The Parallelism control is only done using internal measures of each inverter. The objective is to obtain a control system where the inverters are independent from each other. The proposed control strategy of each inverter has two control loops by instantaneous average values: one for voltage and another for current. The first one is designed to control the output voltage of the inverter, while the second is designed to lead the Parallel Operation of the inverters. The Parallelism control acts in the voltage before the LC filter and it is based on the feedback of the L inductor current. Its function is to guarantee the correct load current sharing. The control technique was corroborated through experimental results with a maximum load of 10 kVA supplied by three Parallel connected inverters.
Guilherme A T Bauer - One of the best experts on this subject based on the ideXlab platform.
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a control strategy for Parallel Operation of single phase voltage source inverters analysis design and experimental results
IEEE Transactions on Industrial Electronics, 2013Co-Authors: Telles Brunelli Lazzarin, Guilherme A T Bauer, Ivo BarbiAbstract:This paper describes a theoretical and experimental study on a control strategy for the Parallel Operation of single-phase voltage source inverters (VSI), to be applied to uninterruptible power supply. The control system for each inverter consists of two main loops, which both use instantaneous values. The first (Parallelism control) employs the feedback of the inductor current from the output filter to modify the input voltage of the same filter and, therefore, to control the power flow of each inverter to the load. Additionally, the second loop (voltage control) is responsible for controlling the output voltage of the LC filter, which coincides with the output voltage of the VSI. Due to the fact that there is no exchange of information among the VSIs regarding their Operation points, it is easier to obtain redundant systems. Furthermore, the connection (or disconnection) of inverters in a Parallel arrangement is carried out directly, without connection impedance, and can occur at any Operation point of the system. The proposed control strategy ensures the proper sharing of the load current and avoids current circulation among the inverters during transient and steady-state Operation. Moreover, its design and implementation are very simple. The control technique was verified through experimental results with a maximum load of 10 kVA supplied by three Parallel-connected inverters.
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a control strategy by instantaneous average values for Parallel Operation of single phase voltage source inverters based in the inductor current feedback
Energy Conversion Congress and Exposition, 2009Co-Authors: Telles Brunelli Lazzarin, Guilherme A T Bauer, Ivo BarbiAbstract:This paper presents a simple, effective and robust control strategy applied to Parallel connected of single phase voltage source inverters. The Parallelism control is only done using internal measures of each inverter. The objective is to obtain a control system where the inverters are independent from each other. The proposed control strategy of each inverter has two control loops by instantaneous average values: one for voltage and another for current. The first one is designed to control the output voltage of the inverter, while the second is designed to lead the Parallel Operation of the inverters. The Parallelism control acts in the voltage before the LC filter and it is based on the feedback of the L inductor current. Its function is to guarantee the correct load current sharing. The control technique was corroborated through experimental results with a maximum load of 10 kVA supplied by three Parallel connected inverters.
