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Hierarchical Fuzzy Control Applied to Parallel Connected UPS Inverters Using Average Current Sharing Scheme

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Abstract

Parallel connection of UPS inverters to enhance power rating is a widely accepted practice. Inter-modular circulating currents appear when multiple inverter modules are connected in parallel to supply variable critical load. Interfacing of modules henceforth requires an intensive design, using proper control strategy. The potentiality of human intuitive Fuzzy Logic (FL) control with imprecise system model is well known and thus can be utilised in parallel-connected UPS systems. Conventional FL controller is computational intensive, especially with higher number of input variables. This paper proposes application of Hierarchical-Fuzzy Logic control for parallel connected Multi-modular inverters system for reduced computational burden on the processor for a given switching frequency. Simulated results in MATLAB environment and experimental verification using Texas TMS320F2812 DSP are included to demonstrate feasibility of the proposed control scheme.

Keywords

Average Current Sharing (ACS) Hierarchical-Fuzzy Logic (H-FL) Multi-inverter Multi-modular (M-M) Parallel inverter Uninterruptible Power Supply (UPS) 
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Copyright information

© The Institution of Engineers (India) 2018

Authors and Affiliations

  1. 1.Department of Electrical EngineeringIndian Institute of Technology RoorkeeRoorkeeIndia

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