Inverter, control method of inverter, photovoltaic system, and controller

Abstract

The application provides an inverter, a control method and a control device of the inverter. The inverter comprises an inverter circuit, a leakage circuit, a voltage sampling circuit, a filter capacitor and a controller. The inverter circuit is connected to a power grid through the voltage sampling circuit. The voltage sampling circuit is used for sampling an alternating current side voltage of the inverter circuit and a power grid voltage of the power grid. One end of the filter capacitor is connected to the alternating current side of the inverter circuit, and the other end of the filter capacitor is connected to a virtual neutral point. The leakage circuit is connected between the virtual neutral point and the ground. The controller is connected to the leakage circuit, and the controller is used for controlling the leakage circuit to discharge a residual voltage in the filter capacitor when an input voltage of the inverter is established and the power grid voltage is not established. The application can eliminate the safety hazard of electric shock caused by touching the cable when the maintenance personnel overhauls the inverter.

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