DG DemoNet: Impact of VOLT/VAR control on increasing the voltage band reserve — Results from field trial validations

In the DG DemoNet Validation project a coordinated voltage controller was developed to actively integrate a high share of renewables into existing distribution systems. The impact of controlling the medium voltage transformer and the reactive power of distributed generation - based on the actual voltages of critical nodes - on voltage range and number of tap changer operations is analysed. Evaluation is based on records gained in two distribution systems where coordinated voltage control is operated for more than half a year.