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US 12,381,491 B2Granted
Method and apparatus for suppressing grid voltage imbalance
AssigneeContemporary Amperex Technology (Hong Kong) Limited
InventorsGuiying Lin, Jinfeng Gao, Weichen He
Life of this patent
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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.
Claims13
A method applied to a pulse width modulation (PWM) rectifier, the method 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;
- obtaining a first bias by obtaining a first difference between an instantaneous active power and an active power given and then inputting the first difference to a first proportional-integral controller and a first resonance controller;
- calculating a power converter voltage using the first bias and according to the instantaneous power;
- and
- obtaining, according to the power converter voltage, a corresponding pulse sequence to suppress grid voltage imbalance.
4 more elements
An apparatus, 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:
- obtain a first bias by obtaining a first difference between an instantaneous active power and an active power given and then inputting the first difference to a first proportional-integral controller and a first resonance controller;
- and
- calculate instantaneous power using the first bias and 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.
6 more elements
Dependencies are inferred from the claim text.