Control of a Three Phase Boost Rectifier under Unbalanced Grid Conditions without Grid Voltage Sensors


This paper presents a method for estimating the positive and negative sequence grid voltage under unbalanced grid conditions using simple algebraic and trigonometric identities without dedicated grid voltage sensors in three phase grid connected boost rectifier converter system. The estimated voltages are then used to control the positive and negative sequence currents of the boost rectifier. The estimation method is based on the positive and negative sequence active and reactive power delivered by the converter to the grid. In addition to the estimation of the positive and negative sequence grid voltage, the proposed method also generates an estimate of the frequency information of the grid similar to a conventional PLL structure. Detailed theory and results confirm the feasibility of the proposed scheme.

Meeting Name

2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018 (2018: Sep. 23-27, Portland, OR)


Electrical and Computer Engineering

Research Center/Lab(s)

Intelligent Systems Center

Keywords and Phrases

Algebra; DC-DC converters; Energy conversion; Frequency estimation; Rectifying circuits; Active and Reactive Power; Grid unbalance; Grid-connected converters; Negative sequence; Negative-sequence currents; Three-phase boost rectifiers; Unbalanced grid conditions; Voltage estimation; Electric rectifiers; Grid connected converter; Positive and negative sequence

International Standard Book Number (ISBN)


International Standard Serial Number (ISSN)


Document Type

Article - Conference proceedings

Document Version


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© 2018 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 Sep 2018