A Complete HSS-Based Impedance Model of MMC Considering Grid Impedance Coupling

Li, Binbin; Han, Linjie; Hu, Junlin; Wang, Shengbo; Zhang, Shiguang; Xu, Dianguo

doi:10.1109/tpel.2020.2996714

Cited by 64 publications

(34 citation statements)

References 33 publications

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“…The HSS theory has been amply discussed recently [15]- [20], and thus not presented here for brevity. The averaged dynamic model of the MMC is adopted and the corresponding HSS equations of the main circuit are given in (1).…”

Section: ) Hss Model Of the Main Circuitmentioning

confidence: 99%

“…The first method originated from the individual channel design theory [18], now so-called singleinput-single-output (SISO) model, which can preserve all information of the high-dimensional MIMO system. However, it is, in fact, a closed-loop model dependent on both the source and load systems [19], [20]. Therefore, the nonexistence of right-half-plane (RHP) poles cannot be assured and should be re-evaluated which brings inconveniences to the stability analysis.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Block Diagonal Dominance-Based Model Reduction Method Applied to MMC Asymmetric Stability Analysis

Zong

Zhang

Lyu

et al. 2021

IEEE Trans. Energy Convers.

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Section: ) Hss Model Of the Main Circuitmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Block Diagonal Dominance-Based Model Reduction Method Applied to MMC Asymmetric Stability Analysis

Zong

Zhang

Lyu

et al. 2021

IEEE Trans. Energy Convers.

View full text Add to dashboard Cite

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“…In addition, active damping and utilization of a high-pass filter in the dc voltage control loop have been suggested in the study as measures of improving the harmonic stability of the system. The authors of [28] have proposed a dcside impedance model based on harmonic state-space which considers grid impedance coupling and an outer dc-voltage control loop. In [29], in addition to the dc-side impedance modeling and stability analysis of a multiterminal HVDC system, a thorough investigation has been made into optimizing the controller parameters and adding a virtual damping controller, with a focus on improving the system stability margin.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Shaping of the DC-Side Admittance of a Modular Multilevel Converter Under Closed-Loop Voltage Control

Nahalparvari

Asoodar

Bessegato

et al. 2021

IEEE Trans. Power Electron.

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The dc-side admittance of a modular multilevel converter can be used in assessing the stability of the dc system by means of impedance-based stability criteria. An accurate mathematical representation of the small-signal admittance can be given using harmonic linearization. To this end, the effect of the internal dynamics of the converter, e.g., the circulating current, the converter control scheme, and the controller parameters on the admittance of the converter should be analyzed. In this paper, a linear analytical model for the dc-side admittance of the converter is derived based on a combination of harmonic linearization and frequency-domain representation which incorporates different control schemes. Moreover, an admittance model is given for the closed-loop voltage control mode of the converter, where the ideal insertion indices are applied. To this end, the impact of an arm-balancing controller and its parameters on the dc-side admittance of the converter is investigated. Finally, experiments are carried out on a downscaled prototype to validate the accuracy of the analytical model.

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“…Recently, the frequency coupling of MMC admittance/impedance has received considerable attention [21][22][23][24][25][26][27][28][29]. Two-order MMC impedance matrixes are proposed in [21][22][23][24][25][26], where the off-diagonal elements in the matrix capture the frequency coupling in MMC impedance.…”

Section: Introductionmentioning

confidence: 99%

“…A three-order impedance model of MMC is derived in [27], and the impedance model includes the coupling among the positive-sequence system, the negative-sequence system, and the DC system. The authors of [28,29] proposed an equivalent SISO impedance model of grid-connected MMC considering its frequency coupling, and the model shows that the frequency coupling makes the MMC impedance be coupled with the grid impedance.…”

Section: Introductionmentioning

confidence: 99%

Effect of Frequency Coupling on Stability Analysis of a Grid-Connected Modular Multilevel Converter System

Wang

Guerrero

2021

Energies

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Due to the internal dynamics of the modular multilevel converter (MMC), the coupling between the positive and negative sequences in impedance, which is defined as frequency coupling, inherently exists in MMC. Ignoring the frequency coupling of the MMC impedance model may lead to inaccurate stability assessment, and thus the multi-input multi-output (MIMO) impedance model has been developed to consider the frequency coupling effect. However, the generalized Nyquist criterion (GNC), which is used for the stability analysis of an MIMO model, is more complicated than the stability analysis method applied on single-input-single-output (SISO) models. Meanwhile, it is not always the case that the SISO model fails in the stability assessment. Therefore, the conditions when the MIMO impedance model needs to be considered in the stability analysis of an MMC system should be analyzed. This paper quantitatively analyzes the effect of frequency coupling on the stability analysis of grid-connected MMC, and clarifies the frequency range and grid conditions that the coupling effect required to be considered in the stability analysis. Based on the quantitative relations between the frequency coupling and the stability analysis of the grid-connected MMC system, a simple and accurate stability analysis method for the grid-connected MMC system is proposed, where the MIMO impedance model is applied when the frequency coupling has a significant effect and the SISO impedance model is used if the frequency coupling is insignificant.

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A Complete HSS-Based Impedance Model of MMC Considering Grid Impedance Coupling

Cited by 64 publications

References 33 publications

Block Diagonal Dominance-Based Model Reduction Method Applied to MMC Asymmetric Stability Analysis

Block Diagonal Dominance-Based Model Reduction Method Applied to MMC Asymmetric Stability Analysis

Modeling and Shaping of the DC-Side Admittance of a Modular Multilevel Converter Under Closed-Loop Voltage Control

Effect of Frequency Coupling on Stability Analysis of a Grid-Connected Modular Multilevel Converter System

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