PQ4WIND – A NOVEL TEST BENCH FOR COMPONENT-LEVEL WIND TURBINE CONVERTER TESTING

The Fraunhofer-Institute for Wind Energy Systems IWES is developing a new multi-megawatt testing facility for low voltage wind turbine converters. The new facility focuses on examining the frequency converters’ electrical behaviour in a wide frequency range from fundamental frequency up to the 200^th harmonic. This paper presents an overview of the project, the design principles of the facility and select preliminary simulations of its grid emulation capabilities. The simulations comprise of a demonstration of the grid emulator’s voltage control and the emulation of both linear and non-linear frequency-dependent grid impedances. The simulations exhibit promising results of the new testing facility regarding accuracy of emulation and usable frequency range.