Comprehensive Analysis of Capacitor Voltage Fluctuation and Capacitance Design for Submodules in Hybrid Modular Multilevel Converter With Boosted Modulation Index

Lin, Lei; Lin, Yizhe; Xu, Chen; Chen, Yu

doi:10.1109/jestpe.2018.2861469

Cited by 34 publications

(21 citation statements)

References 21 publications

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“…This will ensure a complete suppression of the fundamental-frequency power fluctuation. If the constraint equations (24) and (27) are satisfied, (φ2, φ3, k2, k3) will be substituted into equation 29to obtain the value of objective function min F(φ2, φ3), and record them as a group (φ2, φ3, F(φ2, φ3)). Then the values of φ2 and φ3 are changed and the above process is repeated until φ2 and φ3 reach the maximum (π).…”

Section: General Calculation Methods Of the Final References Under mentioning

confidence: 99%

“…The third harmonic voltage injection scheme refers to superimposing the third harmonic zero-sequence component on the three-phase modulation waves [19] In equation (8), ucir is the second order voltage component generated by controlling the second order harmonic circulating current. ucir is usually ignored in the control system when analyzing the capacitor voltage fluctuations since its magnitude is small [21], [24], [26], [27]. To simplify the presentation, the second and third harmonic injection coefficients k2 and k3 are defined as (the subscripts 2 and 3 indicate the second and third harmonics):…”

Section: Mathematical Model Of Harmonic Injection In Hybrid Mmcsmentioning

confidence: 99%

“…Therefore, the negative peak Uua_inj_min with the third harmonic voltage injection should not exceed the negative peak of Uua_min. Thus, the third harmonic voltage injection coefficient k3 should satisfy equation (27), which is calculated from equations (8) and 26: /3 3 3 1/3 1/3 2/ 3 3 3 3 2 3 i 3 3 Re 3 23 3 i 3…”

Section: Amplitude Constraints Of the Injected Harmonicsmentioning

confidence: 99%

“…. (27) Then the amplitudes of the second and third harmonic injections can be determined according to equations (24) and (27).…”

Section: Amplitude Constraints Of the Injected Harmonicsmentioning

confidence: 99%

“…However, the classical scheme is designed with m=1.15, thus further optimization is limited by this specific operating condition. In addition, although different mechanisms of the capacitor voltage fluctuations in HBSMs and FBSMs of hybrid MMC are analyzed in [26], the suppression strategies are not discussed, which may have a large impact on the overall capacitor voltage fluctuations [27].…”

Section: Introductionmentioning

confidence: 99%

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Dual Harmonic Injection for Reducing the Submodule Capacitor Voltage Ripples of Hybrid MMC

Weicheng

Gao

et al. 2021

IEEE J. Emerg. Sel. Topics Power Electron.

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Reducing the capacitor voltage ripples of the half-bridge sub-modules (HBSM) and full-bridge sub-modules (FBSM) in a hybrid modular multilevel converter (MMC) is expected to reduce the capacitance, volume and costs. To address this issue, this paper proposes a dual harmonic injection method which injects the second harmonic circulating current and third order harmonic voltage into the conventional MMC control. Firstly, the mathematical model of the proposed control is established and analyzed. Then, the general strategy of determining the amplitude and phase angle of each injection component is proposed to suppress the fluctuations of the fundamental and double frequency instantaneous power. The proposed strategy can achieve the optimal power fluctuation suppression under various operating conditions, which also has the advantage of reducing the voltage fluctuation difference between HB and FB SMs. The correctness and effectiveness of the proposed strategy are verified in simulations in PSCAD/EMTDC. Index Terms-Hybrid modular multilevel converter (MMC); second harmonic circulating current; third harmonic voltage; dual harmonic injection; fluctuation suppression. NOMENCLATURE Symbols: Descriptions Udc Pole-to-pole dc voltage. Uac Amplitude of the AC-side phase voltage. Im Amplitude of the AC-side phase current. ω Fundamental angular frequency.

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Section: General Calculation Methods Of the Final References Under mentioning

confidence: 99%

Section: Mathematical Model Of Harmonic Injection In Hybrid Mmcsmentioning

confidence: 99%

Section: Amplitude Constraints Of the Injected Harmonicsmentioning

confidence: 99%

“…. (27) Then the amplitudes of the second and third harmonic injections can be determined according to equations (24) and (27).…”

Section: Amplitude Constraints Of the Injected Harmonicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Dual Harmonic Injection for Reducing the Submodule Capacitor Voltage Ripples of Hybrid MMC

Weicheng

Gao

et al. 2021

IEEE J. Emerg. Sel. Topics Power Electron.

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A level adjustment–based fault‐tolerant control strategy for hybrid MMC

Liu

Jin

Jun

et al. 2021

Int Trans Electr Energ Syst

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Summary With the capability of DC fault ride‐through and the reduced cost, the hybrid modular multilevel converter (HMMC) is a promising topology for high‐voltage direct current (HVDC) applications. However, the complicated configuration of HMMCs with a large number and different types of submodules (SM) increases the risk of submodule failure. This paper proposes a novel HMMC submodule fault‐tolerant strategy by adjusting the number of inserted SMs of faulty phases. Then, based on the analysis of the SM voltage fluctuation, an SM capacitor voltage controller matched in coordination with the fault‐tolerant strategy is designed. By utilizing the negative voltage output full‐bridge submodules (FBSMs), this strategy can significantly improve the SM fault‐tolerant capability of the HMMC. Moreover, as compared to conventional fault‐tolerant strategies, the proposed strategy requires fewer components and can be easily implemented. Finally, the feasibility and performance of the proposed strategy are verified by the MATLAB/Simulink simulation experiment under different fault conditions and MMC systems.

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Novel submodule voltage balancing topology for hybrid modular multilevel converters

Liu

Jin

et al. 2021

J. Power Electron.

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Comprehensive Analysis of Capacitor Voltage Fluctuation and Capacitance Design for Submodules in Hybrid Modular Multilevel Converter With Boosted Modulation Index

Cited by 34 publications

References 21 publications

Dual Harmonic Injection for Reducing the Submodule Capacitor Voltage Ripples of Hybrid MMC

Dual Harmonic Injection for Reducing the Submodule Capacitor Voltage Ripples of Hybrid MMC

A level adjustment–based fault‐tolerant control strategy for hybrid MMC

Novel submodule voltage balancing topology for hybrid modular multilevel converters

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