Through intelligent adjusting of the (active and) reactive
power exchange with the grid, the distributed, grid-connected power electronics
in a LV power system may contribute to the (local) voltage regulation in the LV
power grid. Even the contributions by the individual units are minor, the
aggregated impact from a large number of units could be significant. But, as
the contributions from the individual units are minor, the implementation of
the contribution to the local voltage regulation from the individual unit has
to be cheap.
One way to keep the implementation costs low is to avoid the
need for (dedicated) external communication to the units. Autonomous
contribution to the (local) voltage regulation may be based solely on the local
voltage and frequency. The two main challenges related to this are: 1) to
optimise (in terms of i) regulation of the voltage in the entire grid and ii)
power losses in the grid) the contributions from the individual units; and 2)
to make the regulation of the voltage in the grid smooth, stable and robust.
The Master Thesis is expected to develop and
experimentally test strategies for optimised distributed autonomous
contributions to a smooth, stable and robust voltage regulation in a LV grid
with distributed solar power generation, by autonomous regulation of the
reactive power from the individual PV inverters, solely based on the local
voltages (and frequency). The experimental verification is expected to be made
at the DTU experimental research power system facility SYSLAB, including three
distributed PV installations.