Study on AC Harmonic Characteristics of Netherland ±525kV/2GW MMC-HVDC System for Offshore Wind Farms Integration

Ren, Junhui; Li, Wanjie; Zhang, Shunan

doi:10.1109/powercon53785.2021.9697553

Cited by 2 publications

(1 citation statement)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The selected simulation parameters are shown in Table 1, and the selected controller parameters are shown in Table 2 [29,30]. To verify the feasibility of the control strategy used in this paper, the main output quantities in the circuit could be observed so that the steady-state operation control effect of the overall MMC circuit could be observed [31]. The simulation was set to start from t = 0 s, and the active power disturbance was added on the AC side at t = 0.15 s during the simulation to verify the robustness of the circuit against the power fluctuation in the gridconnected operation.…”

Section: Simulation Parametersmentioning

confidence: 99%

The Suppression of Modular Multi-Level Converter Circulation Based on the PIR Virtual Impedance Strategy

Wang

Yan

Wang

et al. 2023

WEVJ

View full text Add to dashboard Cite

In recent years, with the rise of the electric vehicle industry, there has been significant research on charging and power supply vehicle technologies for electric vehicles. In terms of the corresponding converter usage, modular multi-level converters (MMCs) are also increasingly used in the field of electric vehicle power supply research because of their unique advantages. However, the circulating current problem of MMCs has not been effectively addressed in existing domestic and international studies. In this paper, we propose a proportional-integral resonant (PIR) control method combined with virtual impedance for the optimal suppression of the MMC internal circulating current problem based on the comparison and generalization of the existing methods. Based on the analysis of the working principle of MMCs, this paper proposes and adopts the control strategy of combining virtual impedance and proportional-integral resonance to suppress the circulating current and builds a simulation model in MATLAB to verify that the control strategy proposed in this paper is feasible.

show abstract

Section: Simulation Parametersmentioning

confidence: 99%

The Suppression of Modular Multi-Level Converter Circulation Based on the PIR Virtual Impedance Strategy

Wang

Yan

Wang

et al. 2023

WEVJ

View full text Add to dashboard Cite

show abstract

Analytical computation of arm inductor for minimizing MMC circulating current using passive method

Aslam,

Raza

2024

Int. J. Renew. Energy Dev.

View full text Add to dashboard Cite

The study of circulating currents in modular multilevel converters is vital for improving their efficiency and reliability. The circulating current may arise from capacitor voltage unbalancing, modulation imperfections, load variations, and transient conditions. Such currents typically induce distortions in arm currents, exhibiting second-order harmonics that lead to power losses and negatively impact the ratings of converter components as well as the amplitudes of capacitor voltage ripples. Despite ongoing research, effective strategies to mitigate circulating currents are limited. This paper aims to systematically address this issue by selecting key design parameters specifically arm inductance and capacitor values, to suppress circulating currents. The methodology incorporates harmonic analysis and instantaneous power theory to derive expressions for arm inductance. Initial modelling includes common mode and differential mode analyses, leading to an examination of harmonic content. Analysis reveals that the selection of the arm inductor value is mainly influenced by the second-order harmonic component, whereas the capacitor value is determined by the fundamental harmonic component. By adopting this methodology, the boundary limit for arm inductor selection can be determined. This article proposes a novel expression for arm inductor selection. The proposed expression mainly depends on factors such as load, submodule capacitor voltages, submodule capacitor, and differential current. By selecting an appropriate inductor value based on converter-rated parameters, circulating current within the system can be effectively suppressed. The methodology offers a practical framework for arm inductor selection. Simulation results validation shows strong alignment with analytical results with the error margin of less than 1%, hereby the MMC parameter can be determined with better accuracy through analytic method.

show abstract

Study on AC Harmonic Characteristics of Netherland ±525kV/2GW MMC-HVDC System for Offshore Wind Farms Integration

Cited by 2 publications

References 9 publications

The Suppression of Modular Multi-Level Converter Circulation Based on the PIR Virtual Impedance Strategy

The Suppression of Modular Multi-Level Converter Circulation Based on the PIR Virtual Impedance Strategy

Analytical computation of arm inductor for minimizing MMC circulating current using passive method

Contact Info

Product

Resources

About