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Open AccessArticle

Control of Internal Dynamics of Grid-Connected Modular Multilevel Converter Using an Integral Backstepping Controller

1
School of Electrical Engineering, Pusan National University, Busan 46241, Korea
2
School of Electrical and Computer Science, National University of Engineering and Technology, Islamabad 44000, Pakistan
*
Author to whom correspondence should be addressed.
Electronics 2019, 8(4), 456; https://doi.org/10.3390/electronics8040456
Received: 13 March 2019 / Revised: 11 April 2019 / Accepted: 20 April 2019 / Published: 24 April 2019
(This article belongs to the Special Issue Power Quality in Smart Grids)
The modular multilevel converter (MMC) has significant applications in power systems due to its promising features, such as modularity, reliability, scalability, and low harmonic distortion. One of the challenges in the operation of MMC is to regulate the circulating current in its phase leg and sub module (SM) capacitor voltage. This paper presents the control of internal dynamics, i.e., circulating current and submodule capacitor voltage, of the MMC using an integral backstepping algorithm. The design of the controller is based on Lyapunov stability function. The backstepping control ensures the convergence of the error signal to zero. Additionally, the integral action in the control law increases the robustness and reliability of the system against the external disturbances and model uncertainties. Moreover, the integral term in the controller eliminates the residual steady-state error. The Lyapunov function-based design of the backstepping controller guarantees the convergence of circulating current as well as submodule capacitor voltage for any possible initial condition. Moreover, the performance of the proposed integral backstepping controller is compared with the proportional resonant (PR) controller. The proposed backstepping control scheme for three-phase MMC has been implemented in MATLAB/Simulink. View Full-Text
Keywords: modular multilevel converter; circulating current; backstepping control; Lyapunov stability modular multilevel converter; circulating current; backstepping control; Lyapunov stability
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MDPI and ACS Style

Ud Din, W.; Zeb, K.; Ishfaq, M.; Ul Islam, S.; Khan, I.; Kim, H.J. Control of Internal Dynamics of Grid-Connected Modular Multilevel Converter Using an Integral Backstepping Controller. Electronics 2019, 8, 456.

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