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This paper reviews regulations and issues in grids with high penetrations of distributed generation. The characteristics of the voltage profile with PV, HP and CHP systems are shown by simulations. Furthermore the influence on the voltage profile with combinations of those appliances is examined.Index Terms--combined heat and power, distributed generation, distribution grid, heat pumps, photovoltaic, power quality I.

The integration of distributed generation facilities and large loads into the electric grid entails power quality issues. Large scale implementation of renewable and other distributed generation as well as relevant loads like heat pumps into the low and medium voltage grid does not longer allow ignoring the influence of those systems on power quality and stability. Grid codes for different regions started to implement the special requirements introduced by distributed generation. Distributed generation is able to reduce but also to increase issues regarding network loading and stability or power quality. Optimised grid control, generator control as well as demand and supply side management are identified as suitable solutions for an optimised integration into the distribution grid.

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