Grid support by power electronic converters of Distributed Generation units Johan Morren For several reasons an increasing number of small Distributed Generation (DG) units are connected to the grid. Most DG units are relatively small and connected to the distribution network. The introduction of DG causes several problems, which are mainly related to the differences between DG units and conventional generators: they are located at other places in the network, they are operated in another way, they use other technologies, and they can not always control their power. Four problems have been considered in this thesis: damping of harmonics, voltage control, the behaviour of DG units during grid faults, and frequency control.
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