The Use of Averaged-Value Model of Modular Multilevel Converter in DC Grid

This paper investigates the applicability of averaged-value models (AVMs) for modular multilevel converters (MMCs) operating in a voltage-sourced converter-based-high-voltage dc (VSC-HVDC) grid. The AVM models are benchmarked by comparison with a detailed electromagnetic transient model of the grid, including a fully detailed MMC model. Analysis results show that the AVM is only effective as long as the capacitors are large enough to maintain nearly constant voltage across each MMC submodule. This paper also shows that previously developed MMC averaged models are not able to accurately simulate the transients under dc fault conditions. This paper introduces topology changes to a previously proposed averaged model that results in much improved simulation for such conditions. This paper also shows that the model can be used effectively to study HVDC grids with significant time savings.

[1]  H. Akagi,et al.  Control and Experiment of Pulsewidth-Modulated Modular Multilevel Converters , 2009, IEEE Transactions on Power Electronics.

[2]  Simon P. Teeuwsen,et al.  Simplified dynamic model of a voltage-sourced converter with modular multilevel converter design , 2009, 2009 IEEE/PES Power Systems Conference and Exposition.

[3]  Wenjing Liu,et al.  Accelerated Model of Modular Multilevel Converters in PSCAD/EMTDC , 2013, IEEE Transactions on Power Delivery.

[4]  Staffan Norrga,et al.  Validation of the continuous model of the modular multilevel converter with blocking/deblocking capability , 2012 .

[5]  G. Venkataramanan,et al.  Simplified dynamics and control of Modular Multilevel Converter based on a terminal behavioral model , 2012, 2012 IEEE Energy Conversion Congress and Exposition (ECCE).

[6]  U N Gnanarathna,et al.  Efficient Modeling of Modular Multilevel HVDC Converters (MMC) on Electromagnetic Transient Simulation Programs , 2011, IEEE Transactions on Power Delivery.

[7]  Hans-Peter Nee,et al.  On dynamics and voltage control of the Modular Multilevel Converter , 2009, 2009 13th European Conference on Power Electronics and Applications.

[8]  Rainer Marquardt,et al.  An innovative modular multilevel converter topology suitable for a wide power range , 2003, 2003 IEEE Bologna Power Tech Conference Proceedings,.

[9]  Marc Hiller,et al.  Modulation, Losses, and Semiconductor Requirements of Modular Multilevel Converters , 2010, IEEE Transactions on Industrial Electronics.

[10]  J. Jatskevich,et al.  Dynamic Averaged and Simplified Models for MMC-Based HVDC Transmission Systems , 2013, IEEE Transactions on Power Delivery.

[11]  Staffan Norrga,et al.  Dynamic Analysis of Modular Multilevel Converters , 2013, IEEE Transactions on Industrial Electronics.

[12]  Li Jianguo.  Capacitor Voltage Balancing Control by Using Carrier Phase-shift Modulation of Modular Multilevel Converters , 2012 .

[13]  H. Saad,et al.  Dynamic performance of average-value models for multi-terminal VSC-HVDC systems , 2012, 2012 IEEE Power and Energy Society General Meeting.

[14]  G. Bergna,et al.  Evaluation and proposal of MMC-HVDC control strategies under transient and steady state conditions , 2011, Proceedings of the 2011 14th European Conference on Power Electronics and Applications.

[15]  J. Peralta,et al.  Detailed and Averaged Models for a 401-Level MMC–HVDC System , 2012, IEEE Transactions on Power Delivery.

[16]  Steffen Bernet,et al.  Continuous model of Modular Multilevel Converter with experimental verification , 2011, 2011 IEEE Energy Conversion Congress and Exposition.