Decentralized Control of Cascaded H-Bridge Inverters for Medium-Voltage Grid Integration: Preprint

Soham Dutta, Minghui Lu, Rahul Mallik, Branko Majmunovic, Satyaki Mukherjee, Gab-Su Seo, Dragan Maksimovic, Brian Johnson

Research output: Contribution to conferencePaper

Abstract

This paper introduces a fully decentralized control strategy that allows for individualized active and reactive power control of H-bridge inverters connected in series. After formulating a model of the system power flows, we outline a communications-free approach where each inverter can act on independent commands. Inverter-level feedback is accomplished locally via a measurement of current flowing through the stack. A key feature is the lack of any centralized control routines or phase-locked loop. In this framework, the reactive power control loops achieve voltage synchronization among the converters and the grid, and the active power control loops modulate the terminal voltage amplitudes that influence power delivery. Furthermore, pole placement via state feedback is used to ensure stability of voltage synchronization while also enabling tracking of bidirectional power commands. Simulations are presented to validate the proposed approach.
Original languageAmerican English
Number of pages9
StatePublished - 2020
Event21st IEEE Workshop on Control and Modeling for Power Electronics (IEEE COMPEL 2020) -
Duration: 9 Nov 202012 Nov 2020

Conference

Conference21st IEEE Workshop on Control and Modeling for Power Electronics (IEEE COMPEL 2020)
Period9/11/2012/11/20

Bibliographical note

See NREL/CP-5D00-78885 for paper as published in proceedings

NREL Publication Number

  • NREL/CP-5D00-78056

Keywords

  • communication-free modular converter control
  • decentralized control
  • distributed energy resources
  • medium-voltage grid integration
  • pv inverters

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