Submodule Voltage Estimation Scheme in Modular Multilevel Converters with Reduced Voltage Sensors Based on Kalman Filter Approach

Abushafa, Osama, S. A. Dahidah, Mohamed, Gadoue, Shady and Atkinson, David (2018). Submodule Voltage Estimation Scheme in Modular Multilevel Converters with Reduced Voltage Sensors Based on Kalman Filter Approach. IEEE Transactions on Industrial Electronics , p. 1.

Abstract

This paper presents a new voltage estimation method for the submodule (SM) capacitor in a modular multilevel converter (MMC). The proposed method employs a Kalman filter (KF) algorithm to estimate the SM voltages of the converter. Compared with sensor-based methods, this scheme requires only one voltage sensor to achieve the voltage-balancing of the converter. This sensor is connected to the total arm voltage; the proposed algorithm requires also the switching patterns of each upper SM switch which are provided by the controller used without the need for extra sensors. The substantial reduction in the number of voltage sensors improves the system reliability and decreases its cost and complexity. Extensive simulation and experimental analyses carried out to validate the proposed estimation scheme under different conditions include steady-state analyses, the effect of variations in capacitance and inductance, of the impact of low carrier and effective switching frequency on the accuracy of the estimation, step changes to the load, and a range changes in DC voltage. The results obtained are experimentally verified using a single-phase MMC.

Publication DOI: https://doi.org/10.1109/TIE.2018.2795519
Divisions: Engineering & Applied Sciences
Additional Information: © 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Uncontrolled Keywords: Modular multilevel converter (MMC),capacitor voltage estimation,Kalman filter (KF),reduced number of sensors,voltage-balancing control,pulse width modulation (PWM)
Full Text Link: http://ieeexplo ... cument/8264717/
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Published Date: 2018-01-23
Authors: Abushafa, Osama
S. A. Dahidah, Mohamed
Gadoue, Shady
Atkinson, David

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