Control of Output and Circulating Current of Modular Multilevel Converter Using a Sliding Mode Approach

Waqar Uddin, Kamran Zeb, Muhammad Adil Khan, Muhammad Ishfaq, Imran Khan, Saif ul Islam, Hee-Je Kim, Gwan Soo Park and Cheewoo Lee
Additional contact information
Waqar Uddin: School of Electrical and Computer Engineering, Pusan National University, Busan 46241, Korea
Kamran Zeb: School of Electrical and Computer Engineering, Pusan National University, Busan 46241, Korea
Muhammad Adil Khan: Department of Electrical and Computer Science, Air University, Islamabad 44000, Pakistan
Muhammad Ishfaq: School of Electrical and Computer Engineering, Pusan National University, Busan 46241, Korea
Imran Khan: C2N, University of Paris Sud, University of Paris Saclay, 10 Boulevard Thomas Gobert, 91120 Palaiseau, France
Saif ul Islam: School of Electrical and Computer Engineering, Pusan National University, Busan 46241, Korea
Hee-Je Kim: School of Electrical and Computer Engineering, Pusan National University, Busan 46241, Korea
Gwan Soo Park: School of Electrical and Computer Engineering, Pusan National University, Busan 46241, Korea
Cheewoo Lee: School of Electrical and Computer Engineering, Pusan National University, Busan 46241, Korea

Energies, 2019, vol. 12, issue 21, 1-22

Abstract: The modular multilevel converter (MMC) has been prominently used in medium- and high-power applications. This paper presents the control of output and circulating current of MMC using sliding mode control (SMC). The design of the proposed controller and the relation between control parameters and validity condition are based on the system dynamics. The proposed designed controller enables the system to track its reference values. The controller is designed to control both output current and circulating current along with suppression of second harmonics contents in circulating current. Furthermore, the capacitor voltage and energy of the converter are also regulated. The control of output current is carried out in d q -axis as well as in α β − a x i s with first-order switching law. However, a second-order switching law-based super twisting algorithm is used for controlling circulating current and suppression of its second harmonics contents. The stability of the controlled system is numerically calculated and verified by Lyapunov stability conditions. Moreover, the simulation results of the proposed controller are critically compared with the conventional proportional resonant (PR) controller to verify the effectiveness of the proposed control strategy. The proposed controller attains faster dynamic response and minimizes steady-state error comparatively. The simulation of the MMC model is carried out in MATLAB/Simulink.

Keywords: modular multilevel converter; sliding mode control; Lyapunov stability (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (11)

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