A Voltage Sensorless Phase Locked Loop Structure for Single Phase Grid Connected Converter System


The popularly used current controlled architecture for grid connected converter systems needs a phase locked loop (PLL) for its operation. The PLL generates the unit vectors required for desired current reference generation. This paper proposes to eliminate the grid voltage sensor and presents a method to estimate the unit vectors and grid frequency without a dedicated grid voltage sensor. The estimation method is based on the active and reactive power delivered by the converter to the grid. In addition, it also gives an estimation of the fundamental component of the grid voltage. Simulation and experimental results are presented to confirm the feasibility of the proposed scheme.

Meeting Name

9th Annual IEEE Energy Conversion Congress and Exposition (2017: Oct. 1-5, Cincinnati, OH)


Electrical and Computer Engineering

Research Center/Lab(s)

Intelligent Systems Center

Keywords and Phrases

Energy Conversion; Locks (Fasteners); Phase Locked Loops; Active And Reactive Power; Controlled Architecture; Current Reference Generation; Fundamental Component; Grid-Connected Converters; Phase Locked Loop (PLL); Sensor Less Control; Voltage Estimation; Power Converters; Grid Connected Converter; Phase Locked Loop

International Standard Book Number (ISBN)

978-1509029983; 978-1509029990

Document Type

Article - Conference proceedings

Document Version


File Type





© 2017 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 Oct 2017