FPGA implementation of grid synchronization algorithms based on DSC, DSOGI_QSG and PLL for distributed power generation systems

Power electronic converters used in distributed power generation systems need grid synchronization systems. These synchronization methods can be divided into two fundamental parts. Whereas the first part proposes detecting grid signal sequences and harmonics, the second one is based on a PLL (Phase Locked Loop). DSC (Delay Signal Cancellation) y DSOGI-QSG (Dual Second Order Generalized Integrator-Quadrature Signal Generator) techniques are proposed in the first block. In the most of the cases, these types of algorithms are implemented by means of software in microprocessors or DSPs (Digital Signal Processors). In this paper, they are implemented on an FPGA. Thus, important advantages are achieved, like the increment of the input signals and control algorithm sample rate, parallel execution of different algorithms in order to get some information about magnitude, frequency and phase of different harmonics, etc.