New control technique for sensorless grid synchronization of modular multilevel converters for HVDC systems

The circuit configuration of the modular multilevel converter (MMC) requires a large number of current and voltage measurements as well as communications within the converter arms and between the arm controllers and the main control circuit. In order to reduce circuit complexity and hardware requirements with their associated cost, while adding an additional level of reliability to the operation of the MMC, a number of methods have been proposed for the estimation / observation of the various internal electrical variables or parameters of the MMC. These include estimations for submodule capacitor voltages, dc-link voltages, arm currents or total arm energy. Such methods aim to eliminate or reduce the sensors in the circuit, reduce communication requirements or both. This paper provides an overview and classification of the different estimation/observation methods for MMCs currently proposed in the literature.

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Estimation Methods and Sensor Reduction in Modular Multilevel Converters: A Review

Konstantinou

Wickramasinghe

Townsend

et al. 2018

2018 8th International Conference on Power and Energy Systems (ICPES)

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Modular multilevel converter with high-frequency transformers for interfacing hybrid DC and AC microgrid systems

Liu

Escobar-Mejía

Farnell

et al. 2014

2014 IEEE 5th International Symposium on Power Electronics for Distributed Generation Systems (PEDG)

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New control technique for sensorless grid synchronization of modular multilevel converters for HVDC systems

Cited by 2 publications

References 18 publications

Estimation Methods and Sensor Reduction in Modular Multilevel Converters: A Review

Estimation Methods and Sensor Reduction in Modular Multilevel Converters: A Review

Modular multilevel converter with high-frequency transformers for interfacing hybrid DC and AC microgrid systems

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