This invention discloses a low-
voltage standby automatic transfer control method and device compatible with photovoltaic (PV) and
energy storage, applied to a primary /
standby power switching
system. The method includes: at the moment of a mains power failure, utilizing an integrated
hybrid inverter module, before the ATS physically disconnects the mains power, dynamically buffering the load through
energy storage batteries to compensate for the difference between the power required by the load and the actual output power of the PV, thereby maintaining the stability of the load-side
voltage and frequency; seamlessly switching from mains power to a combined PV and
energy storage power supply mode without affecting the
power quality on the load side; and after the switch is completed, dynamically adjusting the
discharge depth and rate of the energy storage based on real-time
light intensity and load changes using an adaptive
impedance matching algorithm. This invention, by setting up a
hybrid inverter integrating a high-speed
DSP controller and a
voltage source
inverter topology, enables smooth, efficient, and seamless switching and coordinated power supply between the grid, PV, energy storage, and load during automatic grid switching.