A Generic Switching State-Space Model for Modular Multilevel Cascade Converters

Kalmbach, Oliver; Hackl, Christoph M.; Rojas, Félix

doi:10.1109/pedg48541.2020.9244315

Cited by 7 publications

(5 citation statements)

References 18 publications

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“…Additionally, a (self-) discharge (or snubber) and series resitance are modelled with R x py,i > 0 (in Ω) and R x sy,i > 0 (in Ω), respectively. The proposed observer is based on a switching model similiarly derived to the model in [15]. With the commonly used Clarke transformation [16,Chap.…”

Section: System Descriptionmentioning

confidence: 99%

A generic Lyapunov-based Observer for Double-Star-Chopper-Cell/Bridge-Cell Modular-Multilevel-Cascade-Converters

Testa¹,

Kalmbach²,

Hackl³

2023

Preprint

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Modular Multilevel Cascade Converter (MMCC) have achieved a great importance in high voltage converter applications. As they require a high amount of capacitors whose voltages must be known for the control of the MMCC, many voltage sensors are needed. This paper presents a nonlinear Lyapunov-based observer for cell voltage estimation. The proposed observer does solely rely on the knowledge of the phase currents i.e. no voltage sensors are required and the convergence of the estimator is shown with a stability proof by Lyapunov. The performance of the observer is validated simulatively using MATLAB/Simulink.

show abstract

Section: System Descriptionmentioning

confidence: 99%

A generic Lyapunov-based Observer for Double-Star-Chopper-Cell/Bridge-Cell Modular-Multilevel-Cascade-Converters

Testa¹,

Kalmbach²,

Hackl³

2023

Preprint

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“…The three positive clusters and the three negative clusters are in a star connection each, forming a two pole (DC) terminal with the voltages v sp , v sn (in V). Depending on the length of connection, a non-negligible parasitic inductance L dc (in H) and resistance R dc (in Ω) must be considered [16]. Furthermore, a second three-phase terminal is formed by the midpoints of each phase, i.e.…”

Section: System Modelingmentioning

confidence: 99%

“…The proposed current controller design is based on a switched model as derived in [16]. The current dynamics can easily be derived by applying Kirchhoff's voltage law to the p-and n-cluster of the DSBC-MMCC in Fig.…”

Section: System Modelingmentioning

confidence: 99%

I/O-Linearization Based Current Decoupling Control of Modular Multilevel Cascade Converters

Kalmbach¹,

Hackl²

2023

Preprint

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A generic current control system for modular multilevel cascade converters (MMCCs) is proposed. It is based on (i) input/output-linearization (I/O-linearization), (ii) feedforward disturbance compensation and (iii) parallelized proportional-integral-resonant controllers to compensate for arbitrarily many harmonics (including positive and negative sequence). The controller design is performed in state space. It is generic and flexible and combines pole placement and LQR tuning. Moreover, it allows to take all system parameters such as cluster or output (grid) inductances or resistances individually into account during controller design and tuning. Moreover, the typically imposed simplifying assumptions on system dynamics (e.g., identical parameters) or operating conditions (e.g., balanced loading) can be overcome. The proposed control system is validated for a dual-star bridge-cell MMCC. The simulation results illustrate its excellent control performance under ideal but also non-ideal conditions, where conventional approaches usually fail.

show abstract

Section: System Descriptionmentioning

confidence: 99%

A generic Lyapunov-based Observer for Double-Star-Chopper-Cell/Bridge-Cell Modular-Multilevel-Cascade-Converters

Testa,

Kalmbach,

Hackl

2023

2023 IEEE 32nd International Symposium on Industrial Electronics (ISIE)

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View full text Add to dashboard Cite

Modular Multilevel Cascade Converter (MMCC) have achieved a great importance in high voltage converter applications. As they require a high amount of capacitors whose voltages must be known for the control of the MMCC, many voltage sensors are needed. This paper presents a nonlinear Lyapunov-based observer for cell voltage estimation. The proposed observer does solely rely on the knowledge of the phase currents i.e. no voltage sensors are required and the convergence of the estimator is shown with a stability proof by Lyapunov. The performance of the observer is validated simulatively using MATLAB/Simulink.

show abstract

A Generic Switching State-Space Model for Modular Multilevel Cascade Converters

Cited by 7 publications

References 18 publications

A generic Lyapunov-based Observer for Double-Star-Chopper-Cell/Bridge-Cell Modular-Multilevel-Cascade-Converters

A generic Lyapunov-based Observer for Double-Star-Chopper-Cell/Bridge-Cell Modular-Multilevel-Cascade-Converters

I/O-Linearization Based Current Decoupling Control of Modular Multilevel Cascade Converters

A generic Lyapunov-based Observer for Double-Star-Chopper-Cell/Bridge-Cell Modular-Multilevel-Cascade-Converters

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