NDLI: Pulse delay control for capacitor voltage balancing in a three-level boost neutral point clamped inverter

Content Provider	IET Digital Library
Author	Krishna, Remya Soman, Deepak E. Kottayil, Sasi K. Leijon, Mats
Abstract	The cross regulation effect in multi-output DC/DC converters offers a reliable support for the grid integration of multilevel inverters by balancing the capacitor voltages. The capacitor voltage balancing by single input dual output boost converter is often realised by conventional three-level switching scheme. The three-level operation benefits lower inductor ripple current, but it limits the maximum possible compensation voltages. In this study, the entire operating modes of the boost converter is presented and all the possible cases which contribute to the voltage balancing are employed for balancing the capacitor voltages in a three-level neutral point clamped inverter. A proportional-integral controller based duty ratio control and pulse delay control are used for DC link voltage regulation and capacitor voltage balancing. Since the classical state-space averaging technique is not suitable for SIDO converters, inductor current ripple averaging technique is utilised for controller design. The circuit simulation is performed in Matlab/Simulink. The digital controller is realised using the Virtex-5FPGA in Labview/CompactRIO module. Both simulation and experimental results are presented to validate the controller performance.
Starting Page	268
Ending Page	277
Page Count	10
ISSN	17554535
Volume Number	8
e-ISSN	17554543
Issue Number	Issue 2, Feb (2015)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/8/2
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2014.0103
Journal	IET Power Electronics
Publisher	The Institution of Engineering and Technology
Publisher Date	2014-11-17
Access Restriction	Open
Rights License	Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Subject Keyword	Capacitor Voltage Balancing Control of Electric Power System Control System Analysis Control System Synthesis Controller Design Cross Regulation Effect DC Link Voltage Regulation DC-DC Power Converter Delay Digital Control Digital Controller Distributed Parameter Control System Field Programmable Gate Array Grid Integration Inductor Current Ripple Averaging Technique Inductor Ripple Current Invertors Labview-Compact-Rio Module Logic And Switching Circuit Logic Circuit MATLAB Multioutput DC-DC Converter PI Control Power Electronics Power Supply Proportional-integral Controller Pulse Delay Control Simulink Single Input Dual Output Boost Converter State-Space Averaging Technique Supervisory Circuit Synthesis Method Three Level Boost Neutral Point Clamped Inverter Three-level Switching Scheme Vertex 5-FPGA Virtual Instrumentation Voltage Control
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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