This paper adds the new Spanish grid code to the previously published works about the comparison of international regulations for connection of wind turbines to the network. All the electrical magnitudes—currents and active and reactive power—regulated in the Spanish grid code are studied when the wind turbines are submitted to real voltage dips. Because grid codes and, specifically, the Spanish grid code do not fix the reactive power definition to be applied, four definitions commonly used have also been studied. Taking advantage of the voltage dips field tests carried out to the Gamesa G80 wind turbines, the results obtained for two representative voltage dip tests are presented: a three‐phase and a phase‐to‐phase voltage dip. Copyright © 2007 John Wiley & Sons, Ltd.

No abstract

This paper presents a dual digital signal processor (DSP) hardware architecture for a grid-connected photovoltaic interface test benchmark, based on a cascade DC/DC converter and DC/AC inverter, with coordinated control algorithms. The control hardware has been designed to test distributed generation (DG) interfaces to be integrated in a hierarchical structure of computational agents, to apply distributed control techniques to the power system management. The proposed dual DSP architecture enables the programming of the control software for the DC/DC converter and the DC/AC inverter in the same processor, to keep the other one for additional operations that are required when there is a high degree of interaction between the DG 2 unit and the rest of the electrical grid components. The hardware architecture has been tested in several real situations such as power factor correction and anti-islanding protection.

This paper presents a comparative study between two commercial programs considering transient analysis of custom power devices based on voltage source converters. The programs investigated were SABER and PSCAD/EMTDC. PSCAD/EMTDC and SABER models of a multi-megawatt wind turbine -Gamesa G80-has been implemented and the obtained results are presented in this paper. Both models take into account the real G80 mechanical, electrical and electronic parameters, together with the same algorithms implemented in the real wind turbine, such as the power converter -IGBTs control level-or active crowbar algorithms.Comparison of steady-state and transient situations have been carried out, and a high degree of agreement in most of the cases has been observed.

No abstract