An Integrated Converter and Machine Control System for MMC-Based High-Power Drives

Espinoza-B., Mauricio; Cárdenas, Roberto; Clare, John; Soto, D.; Díaz, Matías; Espina, Enrique; Hackl, Christoph M.

doi:10.1109/tie.2018.2801839

Cited by 35 publications

(39 citation statements)

References 20 publications

(68 reference statements)

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“…With further algebraic manipulations, the instantaneous power in the upper arm in (8) can be obtained. The same procedure also yields the power expression in (12) in the lower arm.…”

Section: Appendixmentioning

confidence: 92%

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Analysis and compensation of circulating currents errors in modular multilevel converters in low‐frequency operation

Sabbagh

Pan

et al. 2020

IET Power Electronics

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Errors in the injected high-frequency circulating currents are originally investigated for modular multilevel converters (MMCs) in low-speed drive operation. The mathematical analysis reveals that the magnitude and phase errors in the injected circulating currents cause serious energy imbalance in the MMC arms, resulting in large voltage fluctuations in the submodules. Furthermore, these fluctuations get larger when the circulating currents are injected at higher frequencies, which reduces the drive system stability and damages the submodule capacitors. A remedy approach is proposed to minimise the error effects by adjusting the circulating current command. A full-scale system comprising a 1 MVA MMC and a 1 MW induction machine is simulated to verify the theoretical analysis. The experimental investigation of a down-scale MMC feeding an inductor is also conducted to validate the theoretical results.

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“…With further algebraic manipulations, the instantaneous power in the upper arm in (8) can be obtained. The same procedure also yields the power expression in (12) in the lower arm.…”

Section: Appendixmentioning

confidence: 92%

“…An observation of (8) and (12) indicates that the instantaneous power is a summation of four terms. Further close-up examination reveals that the first term contains only output-frequency components determined by the output voltage and current on the AC side.…”

Section: Theoretical Analysismentioning

confidence: 99%

Analysis and compensation of circulating currents errors in modular multilevel converters in low‐frequency operation

Sabbagh

Pan

et al. 2020

IET Power Electronics

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“…An extra linear transformation, referred to as Σ∆ transformation, has been proposed to obtain a geometrical orientation of the four circulating currents of the M 3 C [43]. This transformation has also been used in M 2 C applications, focusing on the interaction of the electrical variables among the converter upper and lower clusters [25,44,45].…”

Section: σ∆ Frame Modellingmentioning

confidence: 99%

“…Even when the high-frequency components of the CCVs are usually low, they can produce small steady-state undesirable oscillations in the circulating currents. Therefore in different papers, the CCVs are filtered using notch-filters and/or low-pass filters before being used in the balancing control system (see [25,27,32,44]). This is further discussed below.…”

Section: Balancing Controlmentioning

confidence: 99%

An Overview of Modelling Techniques and Control Strategies for Modular Multilevel Matrix Converters

et al. 2020

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The Modular Multilevel Matrix Converter is a relatively new power converter topology appropriate for high-power Alternating Current (AC) to AC purposes. Several publications in the literature have highlighted the converter capabilities such as modularity, control flexibility, the possibility to include redundancy, and power quality. Nevertheless, the topology and control of this converter are relatively complex to design and implement, considering that the converter has a large number of cells and floating capacitors. Therefore multilayer nested control systems are required to maintain the capacitor voltage of each cell regulated within an acceptable range. There are no other review papers where the modelling, control systems and applications of the Modular Multilevel Matrix Converter are discussed. Hence, this paper aims to facilitate further research by presenting the technology related to the Modular Multilevel Matrix Converter, focusing on a comprehensive revision of the modelling and control strategies.

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“…For example, to obtain high dynamic response speed, analytic calculation of exponential of matrices is deployed for inner‐loop controller in [15]. To weaken large voltage fluctuations that might appears during transient processes, an integrated control strategy based on double‐loop vector‐control method for MMC was proposed in [16]. Furthermore, focused on minimising voltage ripples in each sub‐module (SM) of MMC, several circulating current injection methods were proposed for circulating current controller in [17].…”

Section: Introductionmentioning

confidence: 99%

Improved sliding‐mode control for MMC in DC power system

Xie

Wen

et al. 2020

IET Renewable Power Generation

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An Integrated Converter and Machine Control System for MMC-Based High-Power Drives

Abstract: Abstract-The

Cited by 35 publications

References 20 publications

Analysis and compensation of circulating currents errors in modular multilevel converters in low‐frequency operation

Analysis and compensation of circulating currents errors in modular multilevel converters in low‐frequency operation

An Overview of Modelling Techniques and Control Strategies for Modular Multilevel Matrix Converters

Improved sliding‐mode control for MMC in DC power system

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