A Zero-Sequence Component Injection Modulation Method With Compensation for Current Harmonic Mitigation of a Vienna Rectifier

Ding, Wenlong; Zhang, Chenghui; Gao, Feng; Duan, Bin; Han, Qing

doi:10.1109/tpel.2018.2812810

Cited by 79 publications

(27 citation statements)

References 26 publications

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“…Mainly because of the aforementioned reason, several papers dealing with the analysis and the control of three-level unidirectional rectifiers under diverse operating conditions have been published in the literature [7][8][9]14,15,[22][23][24][25][26][27][28][29].…”

Section: DCmentioning

confidence: 99%

“…In a similar way, [23][24][25][26][27]29] try to address the input phase current distortion deriving from non-unity power factor operation either by injecting a suitable zero-sequence voltage component for carrier-based approaches, or by correctly allocating the redundant switching states in space vector-based implementations. Nevertheless, none of these papers proposes a general and/or unified approach to ensure undistorted operation also under constant zero-sequence voltage injection.…”

Section: DCmentioning

confidence: 99%

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Three-Level Unidirectional Rectifiers under Non-Unity Power Factor Operation and Unbalanced Split DC-Link Loading: Analytical and Experimental Assessment

et al. 2021

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Three-phase three-level unidirectional rectifiers are among the most adopted topologies for general active rectification, achieving an excellent compromise between cost, complexity and overall performance. The unidirectional nature of these rectifiers negatively affects their operation, e.g., distorting the input currents around the zero-crossings, limiting the maximum converter-side displacement power factor, reducing the split DC-link mid-point current capability and limiting the converter ability to compensate the low-frequency DC-link mid-point voltage oscillation. In particular, the rectifier operation under non-unity power factor and/or under constant zero-sequence voltage injection (i.e., when unbalanced split DC-link loading occurs) typically yields large and uncontrolled input current distortion, effectively limiting the acceptable operating region of the converter. Although high bandwidth current control loops and enhanced phase current sampling strategies may improve the rectifier input current distortion, especially at light load, these approaches lose effectiveness when significant phase-shift between voltage and current is required and/or a constant zero-sequence voltage must be injected. Therefore, this paper proposes a complete analysis and performance assessment of three-level unidirectional rectifiers under non-unity power factor operation and unbalanced split DC-link loading. First, the theoretical operating limits of the converter in terms of zero-sequence voltage, modulation index, power factor angle, maximum DC-link mid-point current and minimum DC-link mid-point charge ripple are derived. Leveraging the derived zero-sequence voltage limits, a unified carrier-based pulse-width modulation (PWM) approach enabling the undistorted operation of the rectifier in all feasible operating conditions is thus proposed. Moreover, novel analytical expressions defining the maximum rectifier mid-point current capability and the minimum peak-to-peak DC-link mid-point charge ripple as functions of both modulation index and power factor angle are derived, the latter enabling a straightforward sizing of the split DC-link capacitors. The theoretical analysis is verified on a 30kW, 20kHz T-type rectifier prototype, designed for electric vehicle ultra-fast battery charging. The input phase current distortion, the maximum mid-point current capability and the minimum mid-point charge ripple are experimentally assessed across all rectifier operating points, showing excellent performance and accurate agreement with the analytical predictions.

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Section: DCmentioning

confidence: 99%

Section: DCmentioning

confidence: 99%

Three-Level Unidirectional Rectifiers under Non-Unity Power Factor Operation and Unbalanced Split DC-Link Loading: Analytical and Experimental Assessment

et al. 2021

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“…In accordance with Table 4, there are huge differences in complexity of switching sequences for DSVM compared to other methods. Even if, in [11], the number of switching sequence is zero, each sectors has the different equations for the switch on-state time. However, in DSVM, only one generalized equation covers all sectors, and the proposed DSVM can calculate the switch on-state time without considering of the switching sequence, sectors, and regions.…”

Section: Regionmentioning

confidence: 99%

“…However, three-level converters require two DC-link capacitors linked in series to produce different voltage levels, unlike conventional two-level converters. Therefore, the DC-link voltage could be unbalanced, which causes overvoltage of the switching device and high THD of the grid current, so the two DC-link voltages should be controlled to be the same [11,12]. While additional circuits may solve this balancing problem, this solution increases power loss, cost, and complexity of the circuit [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Direct Space Vector Modulation with Novel DC-Link Voltage Balancing Algorithm for Easy Software Implementation of Three-Phase Three-Level Converter

Kim

Kwon

2020

Electronics

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The present paper proposes a direct space vector modulation and novel balance algorithm for easy software application of three-level converters which operate in three-phase. In the case of the conventional space vector modulation, to get the on-state times of the switches, the dwell times of the three nearest stationary vectors, which are obtained after sector and region selection algorithms, should be rearranged. These processes, therefore, contain diverse conditional statements and complicated calculations such as inverse trigonometric functions and square roots. However, the burden of the software application of the proposed algorithm is greatly reduced by not using the sector selection algorithm, the region selection algorithm, and the on-state time allocation process as the proposed modulation can directly control the switch on-state time. In a three-level topology, it is required to balance top and bottom capacitor voltages because the DC-link voltage is composed of two capacitor voltages; the unbalanced voltage of each DC-link capacitor causes the overvoltage of the switching devices. Thus, the DC-link voltage balancing algorithm is proposed, and it is also very simple and effective without additional circuits because it controls the switch on-state time directly as well. The 5-kW prototype proved the validity of the proposed algorithm with its feasibility.

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“…When the loads connected to the three VIENNA modules are different, imbalance will occur in the three dc-link voltages. With the goal of maintaining the balance of the three dc-link voltages, a zero sequence current injection method is presented [22,23]. A zero sequence current i Z is poured into the three-phase inner currents, which is given by:…”

Section: Balancing Control To the Three Dc-link Voltages Of Vienna Rementioning

confidence: 99%

Triple Line-Voltage Cascaded VIENNA Converter Applied as the Medium-Voltage AC Drive

et al. 2018

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A novel rectifier based on a triple line-voltage cascaded VIENNA converter (LVC-VC) was proposed. Compared to the conventional cascaded H-bridge converters, the switch voltage stress is lower, and the numbers of switches and dc capacitors are fewer under similar operating conditions in the proposed new multilevel converter. The modeling and control for the LVC-VC ware presented. Based on the analysis of the operation principle of the new converter, the power factor correction of the proposed converter was realized by employing a traditional one-cycle control strategy. The minimum average value and maximum harmonic components of the dc-link voltages of the three VIENNA rectifier modules ware calculated. Three VIENNA dc-link voltages were unbalanced under the unbalanced load conditions, so the zero sequence current was injected to the three inner currents for balancing three VIENNA dc-link voltages. Simulation and the results of the experiment verified the availability of the new proposed multilevel converter and the effectiveness of the corresponding control strategy applied.

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A Zero-Sequence Component Injection Modulation Method With Compensation for Current Harmonic Mitigation of a Vienna Rectifier

Cited by 79 publications

References 26 publications

Three-Level Unidirectional Rectifiers under Non-Unity Power Factor Operation and Unbalanced Split DC-Link Loading: Analytical and Experimental Assessment

Three-Level Unidirectional Rectifiers under Non-Unity Power Factor Operation and Unbalanced Split DC-Link Loading: Analytical and Experimental Assessment

Direct Space Vector Modulation with Novel DC-Link Voltage Balancing Algorithm for Easy Software Implementation of Three-Phase Three-Level Converter

Triple Line-Voltage Cascaded VIENNA Converter Applied as the Medium-Voltage AC Drive

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