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Energies 2019, 12(1), 157;

A Modified One-Cycle-Control Method for Modular Multilevel Converters

School of Mechanical Electronic and Information Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
Author to whom correspondence should be addressed.
Received: 29 November 2018 / Revised: 27 December 2018 / Accepted: 27 December 2018 / Published: 3 January 2019
(This article belongs to the Section Electrical Power and Energy System)
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In this paper, a new One-Cycle-Control (OCC) method is designed for a modular multilevel converter (MMC) based on the principle of the equivalent resistance constant. The proposed controller has a simple structure and a small amount of calculation by cancelling the current inner loop proportional integral (PI) controller and the inverse transform in the traditional direct-quadrature (DQ) control. Compared to the traditional OCC controller, the new one separates the control method from the modulation strategy, making it possible to use not only carrier-based pulse-width modulation (PWM), but also nearest level modulation PWM to generate drive signals. Besides, the independent control of the active and the reactive power is implemented by injecting a reference current with the same phase of the supply voltage or a reference current which lags the supply voltage by π/2 into the controller, so the converter can operate in four quadrants and it can work in either a grid-connect or off-grid environment. The feasibility and the performance of the proposed OCC method have been validated by both the simulation under the MATLAB/SIMULINK (R2012a) environment and experimental results. View Full-Text
Keywords: modular multilevel converter; One-Cycle-Control; four-quadrant operation; carrier-based PWM; nearest level modulation PWM modular multilevel converter; One-Cycle-Control; four-quadrant operation; carrier-based PWM; nearest level modulation PWM

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Tian, X.; Ma, Y.; Yu, J.; Wang, C.; Cheng, H. A Modified One-Cycle-Control Method for Modular Multilevel Converters. Energies 2019, 12, 157.

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