STATIC EXCITER OF AN ELECTRIC GENERATOR, METHOD FOR RETROFITTING, AND METHOD FOR OPERATING
First Claim
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1. A static exciter of an electric generator comprising:
- a main transformer having a high voltage side configured and arranged to be connected to a grid, and a low voltage side;
a generator field circuit;
a field circuit converter having an AC side, connected between the main transformer low voltage side and the generator field circuit;
a capacitor bank; and
a control unit configured and arranged to detect the status of the grid to cause at least the capacitor bank to supply energy to said generator field circuit in case the voltage of the grid falls below a predetermined voltage value;
wherein the capacitor bank is connected between the low voltage side of the main transformer and the AC side of the field circuit converter.
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Abstract
The static exciter (1) of an electric generator (2) has a main transformer (8) with a high voltage side connected to the grid (5) and a low voltage side connected to a field circuit converter (9) that feeds a generator field circuit (3). The static exciter (1) includes a control unit (11) arranged to detect the status of the grid (5) to cause at least a capacitor bank (13) to supply energy to said generator field circuit (3) in case the voltage of the grid (5) falls below a prefixed voltage value. The capacitor bank (13) is connected between the low voltage side of the main transformer (8) and the AC side of the field circuit converter (9).
25 Citations
16 Claims
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1. A static exciter of an electric generator comprising:
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a main transformer having a high voltage side configured and arranged to be connected to a grid, and a low voltage side; a generator field circuit; a field circuit converter having an AC side, connected between the main transformer low voltage side and the generator field circuit; a capacitor bank; and a control unit configured and arranged to detect the status of the grid to cause at least the capacitor bank to supply energy to said generator field circuit in case the voltage of the grid falls below a predetermined voltage value; wherein the capacitor bank is connected between the low voltage side of the main transformer and the AC side of the field circuit converter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for retrofitting a static exciter of an electric generator, the static exciter having a main transformer with a high voltage side connected to the grid and a low voltage side connected to a field circuit converter that feeds a generator field circuit, said static exciter further including a control unit arranged to detect the status of the grid to cause at least a capacitor bank to supply energy to said generator field circuit in case the voltage of the grid falls below a prefixed voltage value, wherein said method comprises:
providing at least one capacitor bank between the low voltage side of the main transformer and the AC side of the field circuit converter. - View Dependent Claims (15)
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16. A method for operating a static exciter of an electric generator having a main transformer with a high voltage side connected to the grid and a low voltage side connected to a field circuit converter that feeds a generator field circuit, said static exciter further including a control unit arranged to detect the status of the grid to cause at least a capacitor bank to supply energy to said generator field circuit in case the voltage of the grid falls below a prefixed voltage value, the method comprising:
injecting electric power with the capacitor bank between the low voltage side of the main transformer and the AC side of the field circuit converter.
Specification