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Analysis of multiloop control strategies for LC/CL/LCL-filtered voltage-source and current-source inverters

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2 Author(s)
Poh Chiang Loh ; Center for Adv. Power Electron., Nanyang Technol. Univ., Singapore ; Holmes, D.G.

Multiloop control strategies have commonly been used to control power inverters of both the voltage-source and current-source topologies for power conversion applications including uninterruptible power supplies and utility interfaces for distributed power generation. However, these control strategies tend to be developed and comparatively evaluated for a particular application, with strategies for other applications presented as independent new developments. This paper presents a generalized analysis of different multiloop control approaches using alternative feedback control variables for several popularly adopted system configurations, highlighting similarities and identifying a generalized optimal control-variable selection criterion that is applicable across most multiloop-controlled inverter systems. The generality of the presented optimal variable selection criterion has been verified through the close similarities between the time-domain waveforms of the different inverter systems simulated in MATLAB Simulink and implemented experimentally in the laboratory.

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Industry Applications, IEEE Transactions on  (Volume:41 ,  Issue: 2 )