Phasor model of Modular Multilevel Converter with circulating current suppression control

Jovcic, Dragan; Jamshidifar, A.A.

doi:10.1109/pesgm.2015.7286104

Cited by 21 publications

(32 citation statements)

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“…have been balanced by means of the sorting method or feedback control [14,15]. But established models cannot describe the charging and discharging dynamics of each SM and they are invalid for the analysis of capacitor voltages without measurements or feedback control.…”

Section: Basic Operation Principles Of MMCmentioning

confidence: 99%

The Uniform Asymptotic Stability of MMC under Open Loop Operation

Xia¹,

Yu²

2018

Proceedings of the 2017 2nd International Conference on Electrical, Control and Automation Engineering (ECAE 2017)

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Section: Basic Operation Principles Of MMCmentioning

confidence: 99%

The Uniform Asymptotic Stability of MMC under Open Loop Operation

Xia¹,

Yu²

2018

Proceedings of the 2017 2nd International Conference on Electrical, Control and Automation Engineering (ECAE 2017)

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“…(2) gives a Steady State Time Periodic (SSTP) model of the MMC, whereas a Steady State Time Invariant (SSTI) model is needed for small signal studies [6]. Dynamic phasor based modelling [8] of the harmonic components is used in order to obtain an SSTI model. The following assumptions are made to simplify the modelling.…”

Section: Detailed Average Modellingmentioning

confidence: 99%

Simplified Modelling of the F2F MMC-Based High Power DC-DC Converter Including the Effect of Circulating Current Dynamics

Taffese

Tedeschi

2018

2018 IEEE 19th Workshop on Control and Modeling for Power Electronics (COMPEL)

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The Front-to-Front Modular Multilevel Converter (MMC) is one of the topologies being considered for highvoltage, high-power, dc-dc conversion. Hence, there is a need for the development of simplified models for such a converter in order to study how it behaves in a large power system. Direct interconnection of two MMC models is one option but it leads to high number of states. Moreover, symmetry of the converter offers further simplification opportunities. The use of this fact to develop a simplified models was reported in literature. However, the resulting models are only applicable when compensated modulation is used. Furthermore, these models neglect the effect of Circulating Current Suppression Controllers (CCSCs), which makes the models inaccurate in the presence of such controllers. This paper proposes a more general simplification approach that captures the effect of CCSC while minimizing the number of states. The proposed model is validated by using time domain simulations and modal (eigenvalue) analyses.

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“…s    X A N X U (21) where X, U, A, and N are identical to (5)~(7) and (9), respectively. In addition, the elements of X, U, and A are given in (…”

Section:  mentioning

confidence: 99%

Impedance modeling of modular multilevel converter based on harmonic state space

Chen

Lyu

et al. 2016

2016 IEEE 17th Workshop on Control and Modeling for Power Electronics (COMPEL)

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The small-signal impedance modeling of modular multilevel converter (MMC) is the key for analyzing resonance and stability of MMC-based ac power electronics systems. MMC is a converter system with a typical multi-frequency response due to its significant steady-state harmonic components in the arm currents, capacitor voltages, and control signals. Therefore, traditional small-signal modeling methods for 2-level voltage-source converters (VSCs) cannot be directly applied to the MMC. In this paper, the harmonic state-space (HSS) modeling approach is introduced to characterize the harmonic coupling behavior of the MMC. On this basis, the small-signal impedance models of the MMC, which take into account the internal dynamics of MMC, are developed according to the harmonic linearization principle. Furthermore, in order to reveal the impact of the internal dynamics and closed-loop control on the small-signal impedance of the MMC, three cases are considered in this paper, i.e., open-loop control, ac voltage closed-loop control, and circulating current closed-loop control. Finally, the analytical impedance models are verified by both simulation and experimental results. Index Terms-Modular multilevel converter (MMC), impedance modeling, impedance measurement, harmonic state-space (HSS), harmonic coupling. especially for renewable energy integration applications [5]-[7].The impedance-based stability analysis method is one of the preferred methods for stability analysis of power electronics systems, especially for multi-converter interconnected systems [8]- [11]. The impedance modeling of power converters is the prerequisite for applying the impedance-based analytical approach. Most of the research has so far focused on the impedance modeling of 2-level converters [9]- [14]. Sequence impedance models of 2-level grid-connected VSCs with current control and phase-locked loop (PLL) dynamics were developed in [9], [14]. DQ small-signal impedance of 2-level VSCs with closed-loop control was derived in [10]- [13]. However, very few authors have by far reported the impedance modeling of an MMC. The dc-side impedance of an MMC was derived for dc voltage ripple prediction in [15], but there is no mention of ac-side impedances. In the beginning of our previous work [6], [16], the ac-side impedance models of the MMC were developed, where, however, the capacitor voltage harmonics and high-order circulating current harmonics were ignored in the impedance modeling, resulting in imprecise impedance models. Later, the harmonic linearization method and harmonic state-space (HSS) method were introduced by the authors to develop the MMC impedance models in [17], [18], which are able to include all the steady-state harmonics of the state variables. In addition, a similar method to the HSS, so called multi-harmonic linearization method, was also proposed to model the MMC impedance in [19].MMC is a converter system with a typical multi-frequency response due to its significant steady-state harmonic components in the arm currents, capacitor volt...

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Phasor model of Modular Multilevel Converter with circulating current suppression control

Cited by 21 publications

References 0 publications

The Uniform Asymptotic Stability of MMC under Open Loop Operation

The Uniform Asymptotic Stability of MMC under Open Loop Operation

Simplified Modelling of the F2F MMC-Based High Power DC-DC Converter Including the Effect of Circulating Current Dynamics

Impedance modeling of modular multilevel converter based on harmonic state space

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