The invention relates to the field of
circuit breaker grid-connected and off-grid conversion, in particular to a
system for realizing grid-connected and off-grid conversion based on a residual current protection
circuit breaker, which is characterized in that a data sensing module acquires data through a
Modbus-RTU protocol, processes the data through a linear
active disturbance rejection control algorithm and outputs a pure data sequence; the power-off state analysis module predicts the power-off probability in combination with an
echo state network algorithm, judges the
island state through an improved island detection
algorithm, fuses multi-source information by utilizing a D-S evidence theory, and judges whether the mains supply is powered off or not to generate a control instruction; the cooperative
verification module carries out priority
ranking on PCS based on an
analytic hierarchy process and a fuzzy evaluation method and carries out cooperative control on off-grid
mode switching by confirming the state of the commercial power, and the commercial power
recovery module calculates the maximum recoverable power according to the rated power of the PCS and the SOC of a battery through load
priority scheduling and a
greedy algorithm, and gradually recovers load power supply; the
system significantly improves the anti-interference capability of grid-connected and off-grid conversion, and is suitable for regions with unstable power grids. Customers feed back that the
system is charged depending on an original
photovoltaic system under the condition that the mains supply is in long-term power failure, so that the power utilization condition is greatly improved, and the power utilization difficulty is relieved.