Multiphase Energy Conversion Systems Connected to Microgrids With Unequal Power-Sharing Capability

Durán, Mario J.; González-Prieto, Ignacio; Gonzalez-Prieto, Angel; Barrero, F.

doi:10.1109/tec.2017.2721499

Cited by 26 publications

(20 citation statements)

References 30 publications

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“…Therefore, the implementation of a power-sharing algorithm for this machine topology requires additional considerations. In particular, recent works proposed the d-q axes decoupling approach for the development of current sharing controls [13]- [15]. Following a similar approach, the three-phase current space vectors of the MSPM drive can be written in the d-q axes reference frame, by introducing suitable sharing coefficients , , and , , , as below:…”

Section: A Radial Force Control In Multi-sector Drives Under Power-smentioning

confidence: 99%

“…In addition, it presents the opportunity of connecting different inverters, each supplying independent sets of phases, to separated power lines, as illustrated in Fig. 1 for a triple three-phase drive [13]. This control possibility, also known under the name of power-sharing capability of multiphase drives, has been analyzed in-depth in recent research studies [14]- [16].…”

Section: Introductionmentioning

confidence: 99%

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Power-Sharing Control in Bearingless Multi-Sector and Multi-Three-Phase Permanent Magnet Machines

Sala

Valente

Nardo

et al. 2021

IEEE Trans. Ind. Electron.

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This paper deals with the power-sharing control of bearingless multi-sector and multi-three-phase permanent magnet machines. The proposed control strategy allows to distribute the power flows among the three-phase inverters supplying the machine during bearingless operation of the drive. The control technique is based on the extension of the vector space decomposition modeling approach. The components producing the electromagnetic torque, i.e. the q-axis currents, are controlled independently from the d-axis ones, also with the aim of managing the power flows among the three-phase systems. Conversely, the d-axis currents are exploited for the generation of the radial forces needed to levitate the rotor, while considering the compensation of the forces caused by the q-axis currents in case of unbalanced power sharing strategy. The validity of the proposed method is confirmed by simulations and experimental tests on a prototyped bearingless multisector permanent magnet synchronous machine. The proposed approach is a contribution to the development of advanced control systems employing multiphase drives in the field of bearingless and multiport applications. Index Terms-Bearingless machines, force control, machine vector control, magnetic levitation, multiphase drives, permanent magnet machines, power-sharing, variable speed drives. NOMENCLATURE Pole pair number. Subscript used to identify the sub-windings under the same P th sector (= 1,2, … ,). Number of three-phase star connected windings located under each pole pair (sector). T Subscript used to distinguish the sub-windings under the same P th sector (= 1,2, … ,). ̅ , Current space vector of each T th three-phase sub-winding under the P th sector.

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Section: A Radial Force Control In Multi-sector Drives Under Power-smentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Power-Sharing Control in Bearingless Multi-Sector and Multi-Three-Phase Permanent Magnet Machines

Sala

Valente

Nardo

et al. 2021

IEEE Trans. Ind. Electron.

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“…Matrix R(θ a ) rotates the α-β components in the counterclockwise direction in order to obtain the d-q components, while the x-y components are rotated in the clockwise direction in order to obtain the x -y components. This direction of rotation of the x-y components is adopted in recent works since it makes easier to control the unbalance of the machine [12,20,84,85]. Considering sinusoidally distributed windings, negligible saturation and symmetry between the different phases, the voltage equations of a six-phase IM in an arbitrary reference frame (rotating at an angular speed ω a ), obtained by the application of the VSD transformation along with (5) are given by [58,86]:…”

Section: Six-phase Induction Machinementioning

confidence: 99%

Finite Control Set Model Predictive Control of Six-Phase Asymmetrical Machines—An Overview

2019

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Recently, the control of multiphase electric drives has been a hot research topic due to the advantages of multiphase machines, namely the reduced phase ratings, improved fault tolerance and lesser torque harmonics. Finite control set model predictive control (FCS-MPC) is one of the most promising high performance control strategies due to its good dynamic behaviour and flexibility in the definition of control objectives. Although several FCS-MPC strategies have already been proposed for multiphase drives, a comparative study that assembles all these strategies in a single reference is still missing. Hence, this paper aims to provide an overview and a critical comparison of all available FCS-MPC techniques for electric drives based on six-phase machines, focusing mainly on predictive current control (PCC) and predictive torque control (PTC) strategies. The performance of an asymmetrical six-phase permanent magnet synchronous machine is compared side-by-side for a total of thirteen PCC and five PTC strategies, with the aid of simulation and experimental results. Finally, in order to determine the best and the worst performing control strategies, each strategy is evaluated according to distinct features, such as ease of implementation, minimization of current harmonics, tuning requirements, computational burden, among others.

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“…While the use of the extra current components has been studied for a long time, some novel advantages of the -current injection have been recently explored [13]. The voltage balancing of series-connected voltage source converters (VSCs) for wind energy applications [14], the unequal power distribution in multi three-phase energy conversion systems for microgrids [15], or the use of enhanced integrated on-board battery chargers for electric vehicles [16] can be cited as some examples of the innovative uses of the -currents.…”

Section: Introductionmentioning

confidence: 99%

Direct Torque and Predictive Control Strategies in Nine-Phase Electric Drives Using Virtual Voltage Vectors

Garcia-Entrambasaguas

Zoric

González-Prieto

et al. 2019

IEEE Trans. Power Electron.

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One of the main distinctive features of multiphase machines is the appearance of new degrees of freedom (voltages/currents) that do not exist in their three-phase counterparts. As a direct consequence, control approaches that apply a single switching state during the sampling period cannot achieve zero average-voltage production. In direct torque control (DTC) this implies that-currents are not regulated, whereas in finite-control-set model predictive control (FCS-MPC) an enhanced-current regulation is feasible only at the expense of disturbing the flux/torque production. Aiming to avoid these shortcomings, this work makes use of the concept of synthetic/virtual voltage vectors (VVs) to nullify/limit the-voltage production in order to improve the current regulation in the secondary planes. Two strategies using two and four virtual voltage vectors (2-VV and 4-VV, respectively) are proposed and compared with the standard case that applies a single switching state. Since standard MPC has the capability to indirectly regulatecurrents, the improvements with the inclusion of VVs are expected to be more significant in DTC strategies. Experimental results validate the proposed VVs and confirm the expectations through a detailed performance comparison of standard, 2-VV and 4-VV approaches for DTC and MPC strategies.

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Multiphase Energy Conversion Systems Connected to Microgrids With Unequal Power-Sharing Capability

Cited by 26 publications

References 30 publications

Power-Sharing Control in Bearingless Multi-Sector and Multi-Three-Phase Permanent Magnet Machines

Power-Sharing Control in Bearingless Multi-Sector and Multi-Three-Phase Permanent Magnet Machines

Finite Control Set Model Predictive Control of Six-Phase Asymmetrical Machines—An Overview

Direct Torque and Predictive Control Strategies in Nine-Phase Electric Drives Using Virtual Voltage Vectors

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