A converter and a zero-crossing control method thereof
By using a control strategy that determines the range of the grid voltage zero-crossing point in the converter, the transition region is increased to reduce mode switching, thus solving the problem of frequent mode switching near the grid voltage zero-crossing point, reducing the grid-connected current THD, and improving current quality.
CN115588988BActive Publication Date: 2026-06-12SUNGROW POWER SUPPLY CO LTD
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SUNGROW POWER SUPPLY CO LTD
- Filing Date
- 2022-11-08
- Publication Date
- 2026-06-12
Smart Images
Figure CN115588988B_ABST
Abstract
The application provides a converter and a zero-crossing point control method thereof. The zero-crossing point control method first judges whether the current grid voltage is in a preset range of a zero-crossing point. If the current grid voltage is not in the preset range of the zero-crossing point, the primary circuit and the secondary circuit connected to the transformer in the converter are controlled to operate in a normal working mode. If the current grid voltage is in the preset range of the zero-crossing point, the primary circuit and the secondary circuit are controlled to operate in a preset working mode. That is, the application adds a transition region near the zero-crossing point, thereby reducing the frequent switching of the working mode of the primary circuit and the secondary circuit at the zero-crossing point of the grid voltage, reducing the current oscillation of the micro inverter and other converters at the zero-crossing point, and reducing the grid current THD.
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