Natural Frame Control of Single-Phase Cascaded H-Bridge Multilevel Converter Based on Fictive-Phases Construction

Yang, Dechang; Wu, Ning; Yin, Li; Lu, Ziguang

doi:10.1109/tie.2017.2760852

Cited by 18 publications

(32 citation statements)

References 29 publications

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“…The natural frame control scheme presented in [23] also shows the advantages of no coordinate transformation, PLL, or conventional imaginary current construction. Differ from the natural frame control scheme, the proposed scheme connects power control with current control through the instantaneous power theory.…”

Section: Discussionmentioning

confidence: 99%

“…To accurately obtain the information on the grid voltage including the amplitude and phase angle, some advanced PLLs have been proposed, such as hybrid filtering technique-based PLL [19], grid sequence separator PLL [20], frequency-fixed SOGI-based PLL [21], and repetitive learning-based PLL [22]. However, the computational complexity of coordinate transformation and PLL increases the calculation burden of the embedded processor like the digital signal processor (DSP) [23]. Therefore, the development of a convenient control method without PLL or coordination transformation is appealing.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

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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“…To obtain the fictional three-phase grid voltage flux linkage value, the fictive-phase construction (FPC) is used to construct the three-phase VF signal [19]. Combining 7and (8), the VF expression in the natural frame is deduced as:…”

Section: B Principle Of Vf Estimatormentioning

confidence: 99%

“…This method has a higher dynamic and steady state performance, but the implementation process is more complicated at the cost of increasing the computational burden of the digital signal processor (DSP). Considering the computational complexity of the control process, a natural frame control, proposed in [19], does not require coordinate transformation and phase-locked loop (PLL) by introducing active voltage unit vector (AVUV) and reactive voltage unit vector (RVUV) into the natural frame, which effectively improves the power quality of the system and reduces the delay.…”

Section: Introductionmentioning

confidence: 99%

AC Voltage Sensorless-Based Natural Frame Control of Cascaded H-Bridge Converter Based on Virtual Flux Observer

Yang

Chen

et al. 2020

IEEE Access

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In this study, a novel natural frame control method without AC voltage sensors is proposed for single-phase cascaded H-bridge (CHB) multilevel converter and implemented in the three-cell CHB converter platform. An improved virtual flux observer (VFO) is introduced to convert the estimated AC voltage signal into the virtual flux (VF) signal and then to vectorize it. The relationship between the instantaneous power and flux linkage is used to achieve independent control of the active and reactive currents. Compared with the conventional single-phase dq control, phase-locked loop (PLL) and coordinate transformation are unnecessary for natural frame control. Furthermore, only orthogonal voltages are required in the proposed control scheme, thus eliminating the time delay caused by constructing orthogonal current signals to improve dynamic performance. The simplification of the entire system is achieved by the omission of AC voltage sensors, the PLL, and coordinate transformations without deteriorating the steadystate and dynamic performances of the entire system. Simulation and experimental results verify the effectiveness of proposed control method. INDEX TERMS Cascaded H-bridge (CHB), natural frame control, sensorless control, virtual flux observer (VFO).

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“…Replacing the diodes in the traditional buck-boost circuit with MOSFET transistors enables bidirectional power transfer and continuous current mode [28][29][30][31][32]. e system flow of the equalization technology is shown in Figure 1.…”

Section: Operating Principle and Designmentioning

confidence: 99%

Hybrid Natural and Forced Active Balancing Control of Battery Packs State of Charge Based on Partnership for a New Generation of Vehicles

Wei

Dai

Wang

et al. 2018

Journal of Electrical and Computer Engineering

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Battery packs are widely used in electric vehicles, and their state-of-charge is one of the essential issues that affect the performances, whilst the balance between parallel and series cell of the battery pack always has an obvious effect. To enhance the working performance of the lithium-based power battery pack, a hybrid natural and forced active balancing control (HNFABC) strategy is proposed and adopted to the balancing circuit that is proposed in this work. These converters, which are advantageous in natural balancing and forced equalization, accelerate the balance speed of natural equilibrium in the final stage and protect the battery from being repeatedly charged and discharged. Simulation and experimental results show that HNFABC is not only simpler than other traditional balance control strategies but also faster in the equalization process. The idea of combining natural equilibrium and forced equilibrium can be inspired to be used in some related industries.

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Natural Frame Control of Single-Phase Cascaded H-Bridge Multilevel Converter Based on Fictive-Phases Construction

Cited by 18 publications

References 29 publications

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

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

AC Voltage Sensorless-Based Natural Frame Control of Cascaded H-Bridge Converter Based on Virtual Flux Observer

Hybrid Natural and Forced Active Balancing Control of Battery Packs State of Charge Based on Partnership for a New Generation of Vehicles

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