Apparatus and method for regulating a power line using frequency

Details Apparatus and method for regulating a power line using frequency Apparatus and method for regulating a power line using frequency

1994-06-29

1997-05-20

Wong, Peter S.

Electricity: power supply or regulation systems

For reactive power control

323210, G05F 170

Patent

active

056315457

ABSTRACT:
A frequency domain self-synchronization controller for solid state switches is disclosed. The controller analyzes a measured power signal in the frequency domain to identify a frequency domain firing angle and then converts the frequency domain firing angle to a time-domain firing signal command. The time-domain firing signal command is used to fire selected solid state switches of, for example, a static VAR compensator, precisely when the voltage across the selected solid state switches is at or near zero volts, so that the solid state switches are not damaged. The controller also calculates the line voltage level of the power system and in response to the voltage level it automatically executes either a high voltage coarse line conditioning strategy, a high voltage fine line conditioning strategy, a low voltage coarse line conditioning strategy, or a low voltage fine line conditioning strategy. Each of the line conditioning strategies is used to rapidly accomplish voltage control of the power signal on a cycle-by-cycle basis.

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