Title :
Design, tuning and testing of a flexible PLL for grid synchronization of three-phase power converters
Author :
Suul, Jon Are ; Ljøkelsøy, Kjell ; Undeland, Tore
Author_Institution :
Dept. of Electr. Power Eng., Norwegian Univ. of Sci. & Technol., Trondheim, Norway
Abstract :
This paper is discussing a flexible three-phase Phase Locked Loop (PLL) with added functionality for grid voltage synchronization in a wide range of operating conditions. The presented structure is based on enhancing the well known Synchronous Reference Frame (SRF) PLL. Functions that modify the behaviour of the loop in order to handle large frequency and grid voltage deviations are also added. The PLL-structure is applicable for many applications with different control systems and different hardware, but is presented for grid synchronization of voltage source converters, with parts of the control system implemented in a Field Programmable Gate Array (FPGA). A simple tuning procedure based on analytical criteria has been developed and the system is analyzed in the frequency domain to verify the stability and illustrate the influence of the added functionality. Results from time-domain simulations and laboratory experiments are presented and discussed to verify the behaviour of the proposed PLL structure.
Keywords :
field programmable gate arrays; frequency-domain analysis; phase locked loops; power convertors; power grids; control system; field programmable gate array; frequency domain; grid voltage synchronization; phase locked loops; synchronous reference frame; three-phase power converters; voltage source converters; Control systems; Field programmable gate arrays; Frequency domain analysis; Frequency synchronization; Hardware; Phase locked loops; Stability analysis; Testing; Tuning; Voltage control; Estimation technique; FPGA; Phase-Locked Loop; Real time processing; Tuning;
Conference_Titel :
Power Electronics and Applications, 2009. EPE '09. 13th European Conference on
Conference_Location :
Barcelona
Print_ISBN :
978-1-4244-4432-8
Electronic_ISBN :
978-90-75815-13-9