The invention, which relates to the technical field of
distributed power generation, discloses a modularized distributed
photovoltaic inverter cluster intelligent regulation and
control system comprising an impedance identification module, an
impedance control module, a state sensing module, a fault diagnosis and isolation module, a power distribution module and a cluster fault control module. The
power grid impedance monitoring module is used for monitoring
voltage and current signals of a grid-connected point of the
photovoltaic inverter, calculating a
power grid equivalent impedance value, an impedance change trend and a
harmonic component proportion of the current
photovoltaic inverter, and generating
power grid impedance information. The impedance identification module and the
impedance control module are arranged, adjustment is carried out based on the
virtual impedance parameters, the
resonance problem caused by power
grid impedance fluctuation is effectively suppressed, the situation that grid-connected current
distortion affects the
electric energy quality is avoided, the photovoltaic
inverter cluster stably operates in a power
grid impedance change scene, and the power
grid impedance change efficiency is improved. And the cluster grid-connected
power quality and the adaptability to the power grid environment are improved.