适用于电网不平衡时广义积分器锁相环设计胡应占.pdfVIP

42 11 Vol.42 No.11 2014 6 1 Power System Protection and Control Jun. 1, 2014 αβ Design of generalized integrator phase locked loop for unbalanced grid HU Ying-zhan, GUO Su-na (Department of Electrical Engineering, Henan Polytechnic Institute, Nanyang 473000, China) Abstract: In order to detect the amplitude, phase and frequency of the grid voltage quickly and accurately, this paper analyzes the method of symmetrical components and principle of single synchronous reference frame phase locked loop. A design method of the generalized integrator phase locked loop is presented, of which the positive and negative components are distinguished in αβ coordinate system, and the phase and frequency of positive sequence voltage are locked. And it takes use of Matlab/Simulink to carry on the research of single synchronous reference frame phase-locked loop and generalized integrator phase locked loop. Simulation results show that the generalized integrator phase locked loop can get amplitude, phase and frequency of the grid voltage accurately when the grid is unbalanced, and the frequency has good adaptiveness and has a certain inhibiting effect on low-order harmonic. Key words: converter; power system; phase locked loop (PLL); symmetrical component method; generalized integrator TM714 A 1674-3415(2014)11-0148-07 De-Bellesciz 1932 [6] [1] 40 PLL