H8 Inverter for Common-Mode Voltage Reduction in Electric Drives

Concari, Luca; Barater, Davide; Buticchi, Giampaolo; Concari, Carlo; Liserre, Marco

doi:10.1109/tia.2016.2581763

Cited by 61 publications

(47 citation statements)

References 18 publications

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“…In power systems feeding a star-connected load, the CMV is defined as the voltage difference between the three-phase load neutral and the ground ( Figure 3) [21,39].…”

Section: Conventional and CMV Mitigation Modulation Techniques For Twmentioning

confidence: 99%

“…where v CM (t) is the instantaneous CMV and v A0 (t), v B0 (t), and v C0 (t) are the per-phase phase-ground instantaneous voltages ( Figure 3). Thus, the impact of the employed modulation technique on the CMV is significant [21,24,39,40]. Figure 3.…”

Section: Conventional and CMV Mitigation Modulation Techniques For Twmentioning

confidence: 99%

“…As a consequence, CMV-derived issues will become more prevalent, as the faster switching will introduce faster CMV variations over time (dv/dt) [9][10][11]20].Considering all the previous, mitigation of CMV in electric drives has become a relevant research topic for the scientific community and the industry [6,7,[21][22][23]. In this context, the inclusion of dedicated filters (passive or active) [21,23,24] and the implementation of specific modulation techniques [21,[24][25][26] are widespread CMV reduction solutions.Alternatively, it is possible to use specific power conversion topologies (derivatives from the conventional two-level three-phase inverter topology) to achieve the same goals. For example, multilevel converters offer a high number of switching states (or degrees of freedom) that can be used to reduce or eliminate CMV [7,[27][28][29].…”

mentioning

confidence: 99%

“…Considering all the previous, mitigation of CMV in electric drives has become a relevant research topic for the scientific community and the industry [6,7,[21][22][23]. In this context, the inclusion of dedicated filters (passive or active) [21,23,24] and the implementation of specific modulation techniques [21,[24][25][26] are widespread CMV reduction solutions.…”

mentioning

confidence: 99%

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Mitigation of Common Mode Voltage Issues in Electric Vehicle Drive Systems by Means of an Alternative AC-Decoupling Power Converter Topology

et al. 2019

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Electric vehicles (EV) are gaining popularity due to current environmental concerns. The electric drive, which is constituted by a power converter and an electric machine, is one of the main elements of the EV. Such machines suffer from common mode voltage (CMV) effects. The CMV introduces leakage currents through the bearings, leading to premature failures and reducing the propulsion system life cycles. As future EV power converters will rely on wide bandgap semiconductors with high switching frequency operation, CMV problems will become more prevalent, making the research on CMV mitigation strategies more relevant. A variety of CMV reduction methods can be found in the scientific literature, such as the inclusion of dedicated filters and the implementation of specific modulation techniques. However, alternative power converter topologies can also be introduced for CMV mitigation. The majority of such power converters for CMV mitigation are single-phase topologies intended for photovoltaic applications; thus, solutions in the form of three-phase topologies that could be applied to EVs are very limited. Considering all these, this paper proposes alternative three-phase topologies that could be exploited in EV applications. Their performance is compared with other existing proposals, providing a clear picture of the available alternatives, emphasizing their merits and drawbacks. From this comprehensive study, the benefits of a novel AC-decoupling topology is demonstrated. Moreover, an adequate modulation technique is also investigated in order to exploit the benefits of this topology while considering a trade-off between CMV mitigation, efficiency, and total harmonic distortion (THD). In order to extend the results of the study close to the real application, the performance of the proposed AC-decoupling topology is simulated using a complete and accurate EV model (including vehicle dynamics and a detailed propulsion system model) by means of state-of-the-art digital real-time simulation.Energies 2019, 12, 3349 2 of 27 the commutations of the power converter devices generate significant high-frequency CMV variations (Figure 1a). As a result, these voltage variations can produce not only high electromagnetic interferences (EMI) [6][7][8], but also shaft voltages (Figure 1b) in the electric machine [9][10][11], producing new capacitive paths [10]. These paths result in high-frequency leakage currents (Figure 1c) circulating through the motor bearings [12][13][14]. The most relevant capacitive paths are depicted in Figure 2, where the most significant bearing currents produced by CMV are the capacitive currents, electrostatic discharge currents, circulating currents, and rotor ground currents [9,13]. As bearings are critical components for the electric machine [10], a number of industrial companies are currently analyzing the degradation problems generated by such bearing currents [15][16][17].Regarding this issue, it is important to remark that although the majority of current industrial solutions rely on silicon-bas...

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“…In power systems feeding a star-connected load, the CMV is defined as the voltage difference between the three-phase load neutral and the ground ( Figure 3) [21,39].…”

Section: Conventional and CMV Mitigation Modulation Techniques For Twmentioning

confidence: 99%

Section: Conventional and CMV Mitigation Modulation Techniques For Twmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Mitigation of Common Mode Voltage Issues in Electric Vehicle Drive Systems by Means of an Alternative AC-Decoupling Power Converter Topology

et al. 2019

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“…These additional components significantly increase the cost, the losses, and the size of the conversion system. In [7] an H8 inverter with zero CMV is presented; however, the topology requires additional active and passive elements. Furthermore, this strategy results in low-frequency ripple on the output currents at low modulation index.…”

Section: Introductionmentioning

confidence: 99%

Space Vector Modulation Techniques for Common-Mode Voltage Reduction in Three-Phase Transformerless Split-Source Inverters

Chaves¹,

Grigoletto²

2020

Eletrônica de Potência

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Photovoltaic (PV) systems with low input voltage usually employ an input boost converter and an output inverter. Regarding to this issue, the split-source inverter (SSI) provides a single power conversion stage which aggregates boost capability with low switch count. On the other hand, conventional modulation strategies applied to the grid-connected SSI can result in large highfrequency common-mode voltage (CMV). Depending on the parasitic path, the CMV synthesized by the inverter can give rise to large leakage current which must be limited for security reasons. This paper proposes two space vector modulation (SVM) strategies to provide the reduction of high-frequency CMV in transformerles SSI. The first strategy is based on the selection of specific voltage vectors whereas the second strategy employs virtual vectors which correspond to the combination of existing voltage vectors. Furthermore, it is performed an analysis in terms of CMV, leakage current, total harmonic distortion of lineto-line voltages and the maximum achievable modulation index. In addition, a comparison with existing techniques is presented to demonstrate the features of the proposed strategies. Finally, simulations and hardware-in-theloop results demonstrate the benefits of the proposed techniques.

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A nine-switch inverter with reduced leakage current for PV grid-tied systems using model-free predictive current control

et al. 2023

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H8 Inverter for Common-Mode Voltage Reduction in Electric Drives

Cited by 61 publications

References 18 publications

Mitigation of Common Mode Voltage Issues in Electric Vehicle Drive Systems by Means of an Alternative AC-Decoupling Power Converter Topology

Mitigation of Common Mode Voltage Issues in Electric Vehicle Drive Systems by Means of an Alternative AC-Decoupling Power Converter Topology

Space Vector Modulation Techniques for Common-Mode Voltage Reduction in Three-Phase Transformerless Split-Source Inverters

A nine-switch inverter with reduced leakage current for PV grid-tied systems using model-free predictive current control

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