Model Predictive Direct Power Control for Single Phase Three-Level Rectifier at Low Switching Frequency

Ma, Junpeng; Song, Wensheng; Wang, Shunliang; Feng, Xiaoyun

doi:10.1109/tpel.2017.2681938

Cited by 78 publications

(28 citation statements)

References 42 publications

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“…There are 3 2 =9 switching states in the adopted converter according to (2), the relation of the input voltage uab and the switching function G i can be listed in Table I. V j (j=1, 2,… 8) is the voltage vector, which is corresponding to the different switching state.…”

Section: A System Modelmentioning

confidence: 99%

“…ingle-phase three-level neutral-point-clamped (NPC) rectifiers are widely adopted as the grid-side converters of the traction-drive system in electric locomotive and high-speed trains, due to the salient advantages of the high power factor, the low harmonic current distortion, the constant dc-link voltage and the bidirectional power flow [1], [2]. Yet, the frequent change of the operating conditions of high-speed trains makes the dc-link voltage of the NPC rectifier fluctuate in a wide range, and equivalent loads connected to two dc-link capacitors will not be identical due to the different operating conditions of the connected traction inverter-drives.…”

Section: Introductionmentioning

confidence: 99%

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Low-Complexity Model Predictive Control of Single-Phase Three-Level Rectifiers With Unbalanced Load

Song

Wang

et al. 2018

IEEE Trans. Power Electron.

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Abstract-The neutral-point potential fluctuation in single-phase three-level rectifiers leads to coupling between the line current regulation and dc-link capacitor voltage balancing, deteriorating waveform quality of the line current. For addressing this issue, this paper proposes a low-complexity model predictive current control (MPCC) with constant switching frequency, which achieves a decoupling control of the line current and the neutral-point potential under the unbalanced load condition. The switching frequency is fixed by combining the MPCC scheme with predefined switching sequences. The boundary of the durations for voltage vectors in switching sequences is presented to balance the capacitor voltage without worsening the line current quality. The optimal switching sequence and the corresponding optimal durations of voltage vectors in the switching sequence are readily derived without the assessment of the cost function, which dramatically simplifies the complexity of the MPCC scheme. Finally, simulations and experimental results are conducted to verify the effectiveness of the proposed MPCC scheme.Index Terms-Model predictive current control (MPCC), neutral-point voltage balancing, single-phase three-level rectifiers, unbalanced load.

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Section: A System Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Low-Complexity Model Predictive Control of Single-Phase Three-Level Rectifiers With Unbalanced Load

Song

Wang

et al. 2018

IEEE Trans. Power Electron.

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“…In SSTs, low-voltage and high-voltage DC outputs might be available for use. Classical and commercialised form of SST includes three stages [2,3]: input PWM rectifier [4][5][6], highfrequency DC/DC converter [7][8][9][10], and output inverter [1,11]. Fully-controlled SST operates bidirectionally and transfers energy to both sides.…”

Section: Introductionmentioning

confidence: 99%

In‐depth study of the application of solid‐state transformer in design of high‐power electric vehicle charging stations

Eshkevari¹,

Mosallanejad

Sepasian

2020

IET Electrical Systems in Transportation

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Solid-state transformers (SST) will play an important role in future electric power distribution. The SST usually used for traction and transportation systems. However, it can be employed for other applications. For example, electric vehicles (EVs) are confronting the increased demand now, and the service provider must expand the infrastructures such as the high-power EV charging stations in urban areas. One solution for designing a high-power charging station is the SST-based charging stations, which can be connected to the distribution network. This study proposes an SST-based EV charging station, which is connected to the 20 kV catenary without any low-frequency transformer and provides the necessary power for connected EVs without affecting the grid power quality. The proposed EV charging station has high flexibility such that it can be integrated with distributed generation. It also provides vehicle-to-grid, grid-to-vehicle and sun-to-vehicle features. Besides, it can inject reactive power to the grid based on its free capacity. This study also proposes an advance virtual flux predictive power controller to improve the immunity of this structure against voltage harmonics. Exact simulations have been done for a three-phase 20 kV/ 600 V/360 kVA station with different scenarios. Results verify the performance of this infrastructure.

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“…Currently, many advanced DPC strategies have been proposed, such as predictive DPC (P-DPC) [9], deadbeat DPC [10], and slide-mode DPC [11]. In the single-phase PWM converter 2 of 18 system, instantaneous power estimation is more complicated than in the three-phase system, which limits the development of DPC schemes in single-phase systems [12].…”

Section: Introductionmentioning

confidence: 99%

Power and Voltage Control for Single-Phase Cascaded H-Bridge Multilevel Converters under Unbalanced Loads

Yang

Yin

Xu³

et al. 2018

Energies

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The conventional control method for a single-phase cascaded H-bridge (CHB) multilevel converter is vector (dq) control; however, dq control requires complicated calculations and additional time delays. This paper presents a novel power control strategy for the CHB multilevel converter. A power-based dc-link voltage balance control is also proposed for unbalanced load conditions. The new control method is designed in a virtual αβ stationary reference frame without coordinate transformation or phase-locked loop (PLL) to avoid the potential issues related to computational complexity. Because only imaginary voltage construction is needed in the proposed control method, the time delay from conventional imaginary current construction can be eliminated. The proposed method can obtain a sinusoidal grid current waveform with unity power factor. Compared with the conventional dq control method, the power control strategy possesses the advantage of a fast dynamic response. The stability of the closed-loop system with the dc-link voltage balance controller is evaluated. Simulation and experimental results are presented to verify the accuracy of the proposed power and voltage control method.

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Model Predictive Direct Power Control for Single Phase Three-Level Rectifier at Low Switching Frequency

Cited by 78 publications

References 42 publications

Low-Complexity Model Predictive Control of Single-Phase Three-Level Rectifiers With Unbalanced Load

Low-Complexity Model Predictive Control of Single-Phase Three-Level Rectifiers With Unbalanced Load

In‐depth study of the application of solid‐state transformer in design of high‐power electric vehicle charging stations

Power and Voltage Control for Single-Phase Cascaded H-Bridge Multilevel Converters under Unbalanced Loads

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