Kukkola , J & Hinkkanen , M 2015 , ' State observer for grid-voltage sensorless control of a grid-connected converter equipped with an LCL filter ' EPE Journal , vol 25 , no. 3 , pp. 21-28 . DOI: 10.1080/09398368.2015.11876826
Abstract:
This paper proposes a simple grid-voltage sensorless alternative to the conventional PLL synchronization for a grid-connected converter equipped with an LCL filter. The grid-voltage magnitude and angle are estimated based only on the converter current and DC-voltage measurements. Reduced number of sensors decreases costs and amount of sensor wiring. The analytically derived design is validated experimentally.