Abstract
The actual grid code requirements include specific demands for grid connected wind power generation facilities. The Transmission System Operators are specially concerned about the Low Voltage Ride Through requirements which are becoming more restrictive in terms of the admissible disconnection conditions, but also in the active/reactive power that wind farms should inject to the network under fault conditions to support the grid. Solutions based on the installation of STATCOMs and DVRs, as well as on advanced control functionalities for the existing power converters of wind power plants, have contributed to enhance their response under faulty and distorted scenarios, and hence to fulfill these requirements. However, in order to achieve satisfactory results with such systems it is necessary to count on accurate and fast grid voltage synchronization algorithms, able to work under unbalanced and distorted conditions. This paper analyzes the synchronization capability of three advanced synchronization systems: the DDSRF-PLL, the DSOGI-PLL and the 3phEPLL, designed to work under such conditions. In the following the different algorithms will be presented and discretized and finally their performance, as well as its computational cost, will be tested in an experimental setup controlled by a means of a TMS28335 floating point DSP.
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