Grid Voltage Estimation and Current Control of a Single-Phase Grid-Connected Converter without Grid Voltage Sensor

Abstract

This paper investigates the possibility of estimating the grid voltage and controlling a single-phase grid-connected converter without a dedicated grid voltage sensor. The main focus is given to current-controlled architectures which need phase-locked loops (PLL) for their operation. The grid voltage estimation method is proposed based on the active and reactive power delivered by the converter to the grid. In addition to the estimation of the grid voltage, the proposed method also generates the unit vectors and frequency information similar to a conventional PLL structure. The influence of various parameters like the dead time, equivalent loss resistance, and the filter inductance on the proposed estimation method is studied in details. Experimental results validate the feasibility of the proposed scheme.

Department(s)

Electrical and Computer Engineering

Research Center/Lab(s)

Intelligent Systems Center

Keywords and Phrases

Electric Power Transmission Networks; Electric Resistance; Estimation; Frequency Estimation; Inductance; Locks (Fasteners); Parameter Estimation; Phase Locked Loops; Power Converters; Reactive Power; Voltage Control; Voltage Measurement; Dead Time Effects; Grid-Connected Converters; Parameter Variation; Sensor Less Control; Voltage Estimation; Electric Power System Control; Dead Time Effect; Grid-Connected Converter; Phase-Locked Loop (PLL); Sensorless Control

International Standard Serial Number (ISSN)

0885-8993; 1941-0107

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

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

Publication Date

01 May 2018

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