Nonlinear Control Structure of Grid Connected Modular Multilevel Converters

 

A. Hajizadeh, L.E.Norum, A.Ahadpour Shal

 

2017/04/25

Abstract

This paper implements nonlinear control structure based on Adaptive Fuzzy Sliding Mode (AFSM) Current Control and Unscented Kalman Filter (UKF) to estimate the capacitor voltages from the measurement of arm currents of Modular Multilevel Converter (MMC). UKF use nonlinear unscented transforms in the prediction step in order to preserve the stochastic characteristics of a nonlinear system. In order to design adaptive robust control strategy and nonlinear observer, mathematical model of MMC using rotating d-q theory has been used. Digital time-domain simulation studies are carried out in the Matlab/Simulink environment to verify the performance of the overall proposed control structure during different case studies.

Published in: Renewable Energy & Power Quality Journal (RE&PQJ, Nº. 15)
Pages: 876-881 Date of Publication: 2017/04/25
ISSN: 2172-038X Date of Current Version:

REF: 501-17

Issue Date: April 2017
DOI:10.24084/repqj15.501 Publisher: EA4EPQ

Authors and affiliations

A. Hajizadeh(1), L.E.Norum(2), A.Ahadpour Shal(3)
1. Department of Energy Technology, Aalborg University. Campus of Esbjerg – (Denmark)
2. Department of Electric Power Engineering, Norwegian University of Science and Technology, Trondheim, Norway
3. Faculty of Electrical Engineering and Information Technology, RWTH-Aachen University, Germany

Key word

Nonlinear Control, Kalman Filter, Nonlinear observer, Modular Multilevel Converter

References

[1] J. Rodriguez, L. J. Sheng and Z. P. Fang, "Multilevel inverters: a survey of topologies, controls, and applications," Industrial Electronics, IEEE Transactions, vol.49, pp. 724-738, 2002.
[2] M. Hagiwara, K. Nishimura, and H. Akagi, "A Medium-Voltage Motor Drive With a Modular Multilevel PWM Inverter," Power Electronics, IEEE Transaction, vol. 25, pp. 1786-1799, 2010.
[3] Yuanze Zhang, Jayashri Ravishankar, John FletcherRui Li, Minxiao Han, “Review of modular multilevel converter based multi-terminal HVDC systems for offshore wind power transmission”, Review of modular multilevel converter based multi-terminal HVDC systems for offshore wind power transmission, Vol.61, pp.572-586, 2016.
[4] M. Hagiwara, I. Hasegawa, and H. Akagi, “Start-up and low-speed operation of an electric motor driven by a modular multilevel cascade inverter,”IEEE Trans. Ind. Appl., vol. 49, no. 4, pp. 1556–1565, Jul./Aug. 2013.
[5] A.Hajizadeh, M.A.Golkar, A.Feliachi, “Voltage Control and Active Power Management of Hybrid Fuel-Cell/Energy-Storage Power Conversion System Under Unbalanced Voltage Sag Conditions”, IEEE Transactions On Energy Conversion, Vol. 25, No. 4, pp.1195-1208, December 2010.
[6] M. Parker, L. Ran, and S. Finney, “Distributed control of a faulttolerant modular multilevel inverter for direct-drive wind turbine grid interfacing,” IEEE Trans. Ind. Electron., vol. 60, no. 2, pp. 509–522, Feb. 2013.
[7] F. Filho, L. Tolbert, Y. Cao, and B. Ozpineci, “Real-time selective harmonic minimization for multilevel inverters connected to solar panels using artificial neural network angle generation,” IEEE Trans. Ind. Appl., vol. 47, no. 5, pp. 2117–2124, Jul. 2011.
[8] G. Mondal , R. Critchley , F. Hassan and W. Crookes "Design and simulation of amodular multi-level converter for MVDC application", Proc.2011 IEEE Int. Symp. Ind. Electron. (ISIE), pp.1 -6, 2011.
[9] M. A Parker, L. Ran, and S. J. Finney, “Distributed control of a fault tolerant modular multilevel inverter for direct-drive wind turbine grid interfacing,” IEEE Trans. Ind. Electron., vol. 60, no. 2, pp. 509–522, Feb. 2013.
[10] S. Sarkka, “On unscented Kalman filtering for state estimation of continuous-time nonlinear systems,” IEEE Trans. Autom. Control, vol. 52, no. 9, pp. 1631–1641, Sep. 2007.
[11] A. Jafari Koshkouei, A. S. I. Zinober, “Sliding Mode Control of Discrete-Time Systems”, Journal of Dynamic Systems, Measurement, and Control, Vol. 122, pp.793-802, 2000.
[12] T. Orowska-Kowalska, M. Kaminski and K. Szabat, "Implementation of a sliding-mode controller with an integral function and fuzzy gain value for the electrical drive with an elastic joint", IEEE Trans. Ind. Electron., vol. 57, no. 4, pp.1309 -1317.2010.