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US 2023/0369987 A1Published application
Method and apparatus for suppressing grid voltage imbalance
AssigneeContemporary Amperex Technology Co., Limited
InventorsGuiying LIN, Jinfeng GAO, Weichen HE
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Abstract
The present application provides a method and apparatus for suppressing grid voltage imbalance. By obtaining a 90° lagged grid voltage through a differential tracker, calculating instantaneous power using the 90° lagged grid voltage, and then calculating a power converter voltage according to the instantaneous power, the suppression of grid voltage imbalance may be achieved.
Claims11
A method for suppressing grid voltage imbalance, wherein the method applies to a PWM rectifier, comprising:
- acquiring a grid voltage and a grid current;
- calculating, according to the grid voltage, a 90° lagged grid voltage by a differential tracker;
- calculating instantaneous power according to the 90° lagged grid voltage and the grid current;
- calculating a power converter voltage according to the instantaneous power;
- and
- obtaining, according to the power converter voltage, a corresponding pulse sequence to suppress grid voltage imbalance.
3 more elements
An apparatus for suppressing grid voltage imbalance, comprising:
- an acquirer to acquire a grid voltage and a grid current;
- a differential tracker to calculate, according to the grid voltage, a 90° lagged grid voltage by the differential tracker;
- an instantaneous power calculation structure to calculate instantaneous power according to the 90° lagged grid voltage and the grid current;
- a power converter voltage calculation structure to calculate a power converter voltage according to the instantaneous power;
- and
- a pulse sequence acquisition structure to obtain, according to the power converter voltage, a corresponding pulse sequence to suppress grid voltage imbalance.
3 more elements
Dependencies are inferred from the claim text.