A voltage balancing strategy with extended operating region for cascaded H-bridge converters

Moosavi, M.; Farivar, Glen G.; Iman‐Eini, Hossein; Shekarabi, Seyed Mohammad

doi:10.1109/tpel.2013.2286270

Cited by 112 publications

(53 citation statements)

References 40 publications

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“…In [17,18], the modulation waves are adjusted by proportional-integral (PI) controller for balancing the voltage. A switching technique has been proposed and applied to improve DC-link voltage (V dc ) balance performance of CHBR for extending the voltage balance region [19][20][21][22]. Due to the equivalence of each module in CHBR, the technique can exchange the switch states of each module to balance the V dc .…”

Section: Introductionmentioning

confidence: 99%

Smooth Switching Technique for Voltage Balance Management Based on Three-Level Neutral Point Clamped Cascaded Rectiﬁer

Han

et al. 2016

Energies

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This paper discussed the topology of in the three-level neutral point clamped cascaded rectifier (3LNPC-CR) for designing the Chinese Power Electronic Traction Transformer (PETT). To balance the DC-link voltage (V dc ) in 3LNPC-CR, a smooth switching technique is proposed in this paper. The controlling processes of each module are relatively independent when the proposed technique is applied in 3LNPC-CR. The proposed technique can keep the switching frequency constant and change the switch state smoothly while balancing V dc . The V dc balance ability is analyzed by calculating the unbalance degree of the loads. Simulation and experiment of three-module 3LNPC-CR are built, and then the effectiveness of the proposed technique is verified.

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Section: Introductionmentioning

confidence: 99%

Smooth Switching Technique for Voltage Balance Management Based on Three-Level Neutral Point Clamped Cascaded Rectiﬁer

Han

et al. 2016

Energies

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“…In order to implement the power routing, other methods for further extending the linear range of CHB converters could also be adopted [21]- [23]. Since the choice of the range extension technique does not alter the fundamental objective of the proposed approach, in the following, the third-harmonic injection will be used, due to the ease of implementation and fast open-loop operation.…”

Section: B Motivation For Power Routingmentioning

confidence: 99%

Power Routing for Cascaded H-Bridge Converters

Andresen

Buticchi

2017

IEEE Trans. Power Electron.

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Abstract-Modular power converters are expected to play a major role in medium-and high-voltage/power applications. Normally, each module processes the same amount of power; however, this does not take into consideration that different modules can have a different remaining useful lifetime. This paper proposes the concept of power routing for cascaded H-bridge (CHB) converters, with the purpose of delaying the failure of the system. A third-harmonic injection into the duty cycles allows extending the imbalance capability of the structure, keeping the CHB operational even if some power paths are completely unloaded. Analytic investigation in conjunction with simulation and experimental measurements demonstrate the power routing by means of the proposed method.

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“…9). The duty cycles for the remaining H-bridges are recalculated in the same manner as in modulation strategy II (18). …”

Section: Modulation Strategy IIImentioning

confidence: 99%

“…The output voltage is modulated in one H-bridge only in each of the inverter phases. The other H-bridges are positively or negatively connected or are bypassed [18]. Since their transistors do not switch, they do not generate commutation loses.…”

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confidence: 99%

Space-vector pulsewidth modulation for a seven-level cascaded H-bridge inverter with the control of DC-link voltages

Lewicki

Morawiec

2017

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract.A control strategy of DC-link voltages for a seven-level cascaded H-bridge inverter is proposed in this paper. The DC-link voltage balancing is accomplished by an appropriate selection of H-bridges and control of their duty cycles in space-vector modulation (SVM) algorithm. The proposed SVM method allows to maintain the same voltage level on all inverter capacitors. Regardless of the balancing function, the SVM strategy makes it possible to generate the output voltage vector properly also in the case where the DC-link voltages are not balanced. The results of simulation and experimental investigations are presented in the paper.Key words: cascaded H-bridge inverter, DC-link voltage control, space vector modulation. Space-vector pulsewidth modulation for a seven-level cascaded H-bridge inverter with the control of DC-link voltagesA. LEWICKI * and M. MORAWIEC Faculty of Electrical and Control Engineering, Gdansk University of Technology, 11/12 Narutowicza St., 80-233 Gdansk, Poland ination pulse width modulation (SHE-PWM) [7]. The spacevector pulse width modulation (SVM) strategies for more than three-level inverters are more complex due to the large amount of space vectors [8,9]. Usually, the SVM strategies for CHB converters utilize three space vectors nearest to the sector in which the reference voltage vector is located [10,11]. Some of proposed SVM strategies concentrate on generating the output voltage vector in the CHB inverters, wherein the DC-link voltages are not equalized [12].The changes in DC-link voltages of CHB inverter are the results of current flow through the DC-link capacitors. The DC-link voltages can be balanced in several ways. The most popular methods are based on managing the H-bridges used to compose the inverter output voltage [7], on modifying the individual reference voltages as well as on changing modulation indexes of the H-bridges [8,13,14]. The DC-link voltages are usually balanced using controllers [8,15], but it is also possible to rotate the carrier signals for every modulation cycle between H-bridges of CHB converter in carrier-based modulation strategies [16].The CHB inverters are mainly applied in medium and highpower applications, where it is particularly important to convert electrical energy with maximum efficiency. In CHB inverters, it is possible to assume maximum value of the modulation indexes for selected H-bridges [17]. The output voltage is modulated in one H-bridge only in each of the inverter phases. The other H-bridges are positively or negatively connected or are bypassed [18]. Since their transistors do not switch, they do not generate commutation loses.In this paper, the DC-link balancing method and SVM strategy for seven-level CHB converters is proposed. Because the SVM strategies for more than three-level inverters are relatively complex [8,9], the topology of the seven-level CHB converter is analyzed as a set of 3 three-level CHB converters connected in series. Each of them is composed using three H-bridges (one H-bridge in each phase of the invert...

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A voltage balancing strategy with extended operating region for cascaded H-bridge converters

Cited by 112 publications

References 40 publications

Smooth Switching Technique for Voltage Balance Management Based on Three-Level Neutral Point Clamped Cascaded Rectiﬁer

Smooth Switching Technique for Voltage Balance Management Based on Three-Level Neutral Point Clamped Cascaded Rectiﬁer

Power Routing for Cascaded H-Bridge Converters

Space-vector pulsewidth modulation for a seven-level cascaded H-bridge inverter with the control of DC-link voltages

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