Capacitor Condition Monitoring Based on an Adaptive Observer of the Low-Frequency Capacitor Voltage Ripples for Modular Multilevel Converters

Rodríguez, Ezequiel; Liang, Gaowen; Farivar, Glen G.; Tafti, Hossein Dehghani; Townsend, Christopher D.; Leyva, R.; Pou, Josep

doi:10.1109/ifeec47410.2019.9015031

Cited by 10 publications

(6 citation statements)

References 25 publications

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“…In practice, the SM capacitance can have deviation, which affects the estimation of CVRs. This challenge can be overcome with available capacitance condition monitoring methods [23].…”

Section: B Iterative Active Power Control Limits Calculation Considering Capacitor Voltage Ripplesmentioning

confidence: 99%

Effect of Capacitor Voltage Ripples on Submodule Active Power Control Limits of Cascaded Multilevel Converters

Liang

Tafti

Farivar

et al. 2022

IEEE Trans. Ind. Electron.

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In the operation of cascaded H-bridge (CHB) converters and modular multilevel converters (MMCs) with energy storage or renewable power resources, unbalanced active power distribution among the submodules (SMs) is unavoidable. Depending on the operating conditions, there are certain upper and lower limits on the active power that can be processed by a single SM or a subset of SMs. The control system needs to restrict the SM power references to these limits, hence, accurate knowledge of the power limits is important. In existing methods to derive the power limits, the SM capacitor voltages are assumed to have negligible ripples, whereas in practice the ripples can be considerable. This paper analyzes the effect of capacitor voltage ripples on the SM active power control limits and highlights the importance of considering the ripple effect. A methodology is proposed to accurately incorporate capacitor voltage ripples in the derivation of SM active power control limits. Simulation and experimental results are provided to evaluate the effectiveness of the proposed methodology. Index Terms-Active power control limits, cascaded H-bridge, capacitor voltage ripple, hybrid integration of energy sources, modular multilevel converter.

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“…In practice, the SM capacitance can have deviation, which affects the estimation of CVRs. This challenge can be overcome with available capacitance condition monitoring methods [23].…”

Section: B Iterative Active Power Control Limits Calculation Considering Capacitor Voltage Ripplesmentioning

confidence: 99%

Effect of Capacitor Voltage Ripples on Submodule Active Power Control Limits of Cascaded Multilevel Converters

Liang

Tafti

Farivar

et al. 2022

IEEE Trans. Ind. Electron.

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“…The variables v Cui and v Cli are the capacitor voltages of the ith SM in the upper and lower arms. For the sake of construction and operation of the system, capacitor voltages should be balanced and voltage ripples should be sufficiently suppressed [10], [11]. Assuming balanced capacitor voltages and negligible capacitor voltage ripples,…”

Section: A Modeling Of An Mmc-based Bessmentioning

confidence: 99%

“…Hence, the maximum and minimum power limits of an arbitrary subset of SMs can be derived analytically with ( 7), ( 8), ( 10) and (11). It is worth to note that any active power distribution among SMs is viable for the system if and only if the sum of SM power reference of an arbitrary subset of SMs lies within the corresponding minimum and maximum limits.…”

Section: A Derivation Of the Inter-sm Active Power Disparity Limitsmentioning

confidence: 99%

“…The root cause of this nonlinear relationship between P n max ( P n min ) and n is that the SM output voltages in one arm should sum up to the arm voltage reference, as indicated in (9). Hence, v n max (the allowed maximum output voltage of n SMs) can be saturated to v * u instead of nV C , while v n min (the allowed minimum output voltage of n SMs) can be saturated to v * u − (N − n)V C , as indicated in (10) and (11). If v n max is always nV C and v n min is always 0, this nonlinear relationship will not exist.…”

Section: B Derived Limits Of a Specific Casementioning

confidence: 99%

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Analysis of the Inter-Submodule Active Power Disparity Limits of Modular Multilevel Converter-Based Battery Energy Storage Systems

Liang

Tafti

Farivar

et al. 2020

2020 IEEE Energy Conversion Congress and Exposition (ECCE)

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“…In practice, the SM capacitance can have deviation, which affects the estimation of capacitor voltage ripples. This challenge can be overcome with available capacitance condition monitoring methods [80].…”

Section: Iterative Sm Average Active Power Limits Calculationmentioning

confidence: 99%

Inter-submodule unbalanced active power distribution of battery energy storage systems based on cascaded multilevel converters

Liang¹

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Capacitor Condition Monitoring Based on an Adaptive Observer of the Low-Frequency Capacitor Voltage Ripples for Modular Multilevel Converters

Cited by 10 publications

References 25 publications

Effect of Capacitor Voltage Ripples on Submodule Active Power Control Limits of Cascaded Multilevel Converters

Effect of Capacitor Voltage Ripples on Submodule Active Power Control Limits of Cascaded Multilevel Converters

Analysis of the Inter-Submodule Active Power Disparity Limits of Modular Multilevel Converter-Based Battery Energy Storage Systems

Inter-submodule unbalanced active power distribution of battery energy storage systems based on cascaded multilevel converters

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