| 1. |
- Behrouzian, Ehsan, 1985, et al.
(author)
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An overview of multilevel converter topologies for grid connected applications
- 2013
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In: 15th European Conference on Power Electronics and Applications (EPE). 2-6 Sept. 2013, Lille, France.. - 9781479901166 ; , s. 1-10 (Article no. 6634634)
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Conference paper (peer-reviewed)abstract
- This paper provides an overview of multilevel converter topologies for grid connected applications. Different converter topologies such as Diode Clamp Converter (DCC), Capacitor Clamp Converter (CCC) and Chain Link Converter (CLC) are considered and compared from different aspects such as component sizing, complexity, efficiency and reliability. Thanks to its modular structure, the CLC appears as the most attractive topology for high power and high voltage applications. Single-Star Bridge-Cell (SSBC), Single-Delta Bridge-cell (SDBC), Double-Star Bridge-Cell (DSBC) and DoubleStar Chopper-Cell (DSCC) are four basic subset topologies of CLC. A comprehensive comparison of these subset topologies for the CLC is provided for the particular application of grid connected converters. The problem of operation under unbalance grid conditions and the ability of this converter topology to inject negative sequence into the grid are discussed. It will be shown that due to the lack of a common DC link between phases, this converter topology presents limited negative sequence injection capability when the phase legs are connected in delta, while in case of star connection voltage balancing between the different cells of the converter becomes problematic due to the uneven current distribution among phases. This represents the main limitation of this converter topology, especially when used for load balancing and active filter applications.
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| 2. |
- Behrouzian, Ehsan, 1985, et al.
(author)
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Investigation of negative sequence injection capability in H-bridge multilevel STATCOM
- 2014
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In: 2014 16th European Conference on Power Electronics and Applications, EPE-ECCE Europe 2014. - 9781479930159 ; , s. Art. no. 6910883-
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Conference paper (peer-reviewed)abstract
- The aim of this paper is to investigate the ability of star- and delta-connected H-bridge multilevel STATCOMs to exchange negative-sequence current with the grid. Zero-sequence injection is utilized for capacitor voltage balancing. It is shown that a singularity for these configurations exists, leading to limitations in the utilization of the compensator for asymmetry compensation purposes.
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| 3. |
- Haghbin, Saeid, 1977, et al.
(author)
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Modal Field-Oriented Control of a Split-Phase PM Motor with Dual Inverters
- 2013
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In: Journal of Electrical and Control Engineering. - 2226-2881. ; 3, s. 7-16
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Journal article (peer-reviewed)abstract
- Multiphase machines have a higher efficiency, greater fault tolerance, lower torque ripple and reduced rated power electronics rating compared to their three-phase counterparts. However, the drive system and control is more complicated for the multiphase machines. A novel drive system for a split-phase permanent magnet motor and dual inverters is presented and explained in this paper. Field-oriented control (FOC) is utilized for the speed controlwhich a new decoupled current controllers are exploited to remove the tight coupling between the d and q current components. An eigenvalue decomposition method is used to transform the system state-space equations to its modal form. Based upon, the decoupled PI current controllers are proposed including the design procedure. A maximum torque per ampere (MTPA) strategy is developed to determine the reference values for the current controllers. Simulation results are provided to show that the proposed drive system has a good dynamic and steady state performance in a speed control system.
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| 4. |
- Josefsson, Oskar, 1985, et al.
(author)
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Evaluation and comparison of a two-level and a multilevel inverter for an EV using a modulized battery topology
- 2012
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In: IECON Proceedings (Industrial Electronics Conference). - 2162-4704 .- 2577-1647. - 9781467324199 ; , s. 2949 - 2956
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Conference paper (peer-reviewed)abstract
- This paper analytically evaluates when it is suitable to use a multilevel inverter in an electrified vehicle. The multilevel inverter is compared to a classical two level inverter for different operation points and for different drive cycles.Reliable models of the components which build up the inverter are needed in order to be able to calculate the losses. Analytical models for the losses are developed to be able to compare the two inverters. Since the two inverters utilizes the battery in different ways the losses in the battery is also considered.It is shown that in certain operation points it is an advantage to use a multilevel inverter to achieve a higher efficiency for the inverter but is also shown that in some operation points the multilevel inverter increases the losses in the battery. However, it is worth mentioning that there is a controllability on where in the battery the losses should take place.The multilevel inverter can also be used as a two level inverter in these operation points to minimize the battery losses.
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