The Method of Realizing IPLL with Software

Abstract

The concept of Phase-locked loop is earliest described in the 1820’s. In the late 1970 s, the theory of phase locked loop was given good description, but because of the difficulty of hardware implementation of a phase-locked loop, phase-locked loop, until a long time, was not widely used. In the 1970’s, with the rapidly development of integrated circuit (IC), PLL was widely used in modern communication system. Since then, the phase-locked loop had made great progress, and it was transferred from the earlier only used in field of high precision equipment to the all kinds of electronic products used in the consumer. Due to the rapid development of power system, power system signal analysis is more and more important. In this paper, according to the characteristics of the virtual radio technology and the basic principle of phase-locked loop to build software phase-locked loop, through the analysis of the improved phase-locked loop (IPLL), designed IPLL by way of the software. In this paper, based on the MATLAB simulation, the above analysis shows that the software phase-locked loop can be extracted grid signal, frequency, amplitude and phase of fundamental wave information for demand.

Keywords

• Software phase-locked loop
• Improved phase-locked loop
• Simulation
• Amplitude extraction.