Title: A modernistic PLL based on feed forward frequency estimator with selective harmonic pre filter for grid imperfection
Authors: Seema Agrawal; D.K. Palwalia
Addresses: Electrical Engineering Department, Rajasthan Technical University, Kota-324010, India ' Electrical Engineering Department, Rajasthan Technical University, Kota-324010, India
Abstract: This paper describes a synchronisation technique to track phase and frequency of input signal under abnormal grid condition like frequency variation. Proposed control topology consist of a conventional synchronous reference frame phase locked loop (SRF PLL) type-2 along with a feed forward frequency estimator loop with selective harmonic filtering technique. It eliminates phase and frequency error under wide frequency deviation. Phase error is fed into proportional integral regulator which reduces it to zero. It is observed that faster and better dynamic performance is achieved by frequency estimator with higher stability margin. The stability is evaluated by bode plot. An estimated frequency is smooth and close to fundamental frequency as it uses the information from all three phase to estimate a single value for frequency. The feed forward action is implemented with pre filtering stage to improve dynamic performance of system. Simulation results are presented to validate effectiveness of proposed technique.
Keywords: phase lock loop; PLL; synchronous reference frame; dynamic performance; grid synchronisation; frequency estimation; selective harmonic filtering.
International Journal of Power and Energy Conversion, 2019 Vol.10 No.3, pp.350 - 371
Received: 19 Apr 2017
Accepted: 03 Jul 2017
Published online: 11 Sep 2019 *