Current Controller for Multi-level Front-end Converter and Its Digital Implementation Considerations on Three-level Flying Capacitor Topology

This paper presents behaviour analysis and digital implementation of current error space phasor based hysteresis controller applied to three-phase three-level flying capacitor converter as front-end topology. The controller is self-adaptive in nature, and takes the converter from three-level to two-...

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Bibliographic Details
Published inJournal of the Institution of Engineers (India). Series B, Electrical Engineering, Electronics and telecommunication engineering, Computer engineering Vol. 98; no. 5; pp. 449 - 459
Main Authors Tekwani, P. N., Shah, M. T.
Format Journal Article
LanguageEnglish
Published New Delhi Springer India 01.10.2017
Springer Nature B.V
Subjects
Assembly language
Capacitors
Communications Engineering
Computer simulation
Digital signal processors
Engineering
Flight
Harmonic distortion
Mathematical models
Microprocessors
Networks
Original Contribution
Power factor
Self adaptive control systems
Signal processing
Topology
Current controller
Total harmonic distortion
Multi-level converter
Front-end converter
Unity power factor
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Summary:This paper presents behaviour analysis and digital implementation of current error space phasor based hysteresis controller applied to three-phase three-level flying capacitor converter as front-end topology. The controller is self-adaptive in nature, and takes the converter from three-level to two-level mode of operation and vice versa, following various trajectories of sector change with the change in reference dc-link voltage demanded by the load. It keeps current error space phasor within the prescribed hexagonal boundary. During the contingencies, the proposed controller takes the converter in over modulation mode to meet the load demand, and once the need is satisfied, controller brings back the converter in normal operating range. Simulation results are presented to validate behaviour of controller to meet the said contingencies. Unity power factor is assured by proposed controller with low current harmonic distortion satisfying limits prescribed in IEEE 519-2014. Proposed controller is implemented using TMS320LF2407 16-bit fixed-point digital signal processor. Detailed analysis of numerical format to avoid overflow of sensed variables in processor, and per-unit model implementation in software are discussed and hardware results are presented at various stages of signal conditioning to validate the experimental setup. Control logic for the generation of reference currents is implemented in TMS320LF2407A using assembly language and experimental results are also presented for the same.
ISSN:2250-2106
2250-2114
DOI:10.1007/s40031-017-0281-9