An apparatus and method of control for converting DC (direct current)
power from a solar photovoltaic source to AC (alternating current) power.
A novel DC-to-AC power converter topology and a novel control method are
disclosed. This combination of topology and control are very well suited
for photovoltaic microinverter applications. Also, a novel variant of
this control method is illustrated with a number of known photovoltaic
DC-to-AC power converter topologies. The primary function of both control
methods is to seek the maximum power point (MPP) of the photovoltaic
source with novel, iterative, perturb and observe control algorithms. The
control portion of this invention discloses two related control methods,
both an improvement over prior art by having greatly improved stability,
dynamic response and accuracy.