Influence of Inverter Dominated Small Energy Producers on the Voltage Stability of Distribution Grids in Steady State

S. Brenner, M. Wolter, and L. Hofmann (Germany)


Voltage stability, Distributed generation, Reactive power adjustment, Selfcommutated inverters with PWM switching, Reduction of grid losses


To ensure a safe and reliable energy supply utilities must now face new challenges. This is mainly due to the increasingly dynamic trend towards decentralized electricity generation. The causations for the increasing amount of distributed generation include energy policy frameworks created in recent years and the deregulation process of the European energy market. The increasing amount of distributed generation in the low and medium voltage level within the power grids can not always be consummated locally but has to be transmitted over a long distance. This causes a bidirectional power flow and leads to overvoltage at the injection point and at adjacent nodes. The results are outages and overstressed equipment. In this paper a new approach on the exploitation of reactive power reserves of inverter dominated distributed sources is introduced. Although X/R ratio differs from the transmission system reactive power offers a constricted but cost-effective possibility to control nodal voltages. So, a method to control single nodal voltages by using reactive power reserves of inverters is presented.

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