Power converter control method, power converter and controller

By controlling the voltage relationship between the power frequency switching circuit and the DC-DC conversion circuit, and utilizing the reverse cutoff characteristic of the diode to cut off the current path when the relay is closed, the problem of current surge in the power converter is solved, and the stable operation of the power grid equipment is achieved.

CN122456861BActive Publication Date: 2026-09-25SHANGHAI MOOREWATT ENERGY TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202610932335.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-06-25
Publication Date
2026-09-25
Estimated Expiration
2046-06-25

AI Technical Summary

Technical Problem

During the grid connection process of the power converter, the voltage difference across the relay causes inrush current, which affects the life of the device and impacts the grid voltage. Existing technologies cannot avoid current inrush to the greatest extent possible.

Method used

By controlling the switching transistor in the power frequency switching circuit to be in the off state, the instantaneous voltage value of the DC-DC converter circuit is greater than the AC voltage of the power grid. Utilizing the reverse cutoff characteristic of the diode in the power frequency switching circuit, the relay is controlled to close to connect the power converter and the power grid, cutting off the inrush current path.

Benefits of technology

This minimizes the current surge when the relay closes, improving the flexibility of relay control and the stability of power grid equipment.

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Abstract

The application relates to a power converter control method, a power converter and a controller, wherein the power converter comprises a direct-current-direct-current conversion circuit, a power frequency flip circuit, a relay and the controller, a first end of the direct-current-direct-current conversion circuit is used for connecting a direct-current source, a second end of the direct-current-direct-current conversion circuit is connected with a first end of the power frequency flip circuit, a second end of the power frequency flip circuit is connected with a first end of the relay, and a second end of the relay is used for connecting a power grid; the method comprises the following steps: controlling each switch tube in the power frequency flip circuit to be in an off state; controlling a transient value of a second end voltage of the direct-current-direct-current conversion circuit to be greater than a transient value of an alternating-current voltage of the power grid; and controlling the relay to be closed to connect the power converter and the power grid. The above method can maximally avoid current impact.
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