TITLE:
Improved PLL Tuning of Shunt Active Power Filter for Grid Connected Photo Voltaic Energy System
AUTHORS:
Rajmohan Rajalakshmi, Vairamani Rajasekaran
KEYWORDS:
Shunt Active Filter, Phase Locked Loop, Artificial Bee Colony, Current Control Method, PV System
JOURNAL NAME:
Circuits and Systems,
Vol.7 No.10,
August
19,
2016
ABSTRACT: This research work brings out the unique predictive current
control method for attaining an efficient grid connected Photo Voltaic (PV)
system by Shunt Active Power Filter (SAPF) as grid connected converter. The
major objective of the research work is to address the presence of Direct
Current (DC) component, frequency improvement, quicker theta response, voltage
magnitude estimation in the input signal of the Phase Locked Loop (PLL) which
is challenging. This work focuses on tuning the PLL block (Kp,Ki,Kvand Ko)through Artificial Bee Colony (ABC) optimization algorithm. The proposed ABC
based modified three-phase PLL method is based on adding a new loop inside the
PLL structure. In power converters, ABC algorithm is used to select the optimal
switching states. The voltage vector which minimizes a cost optimization
function is selected. Simulation is carried out for both balanced and
unbalanced system and the results validate that the performance of the proposed
approach is better in terms of harmonic compensation as per the IEEE standards
within ±5%, power factor improvement of the system, quicker theta tracking and
suppression of frequency jump with the interconnection of PV system.