VAR Generator having controlled discharge of thyristor switched

Details VAR Generator having controlled discharge of thyristor switched VAR Generator having controlled discharge of thyristor switched

1984-11-15

1986-02-18

Wong, Peter S.

Electricity: power supply or regulation systems

For reactive power control

Using impedance

363 54, 363 68, 361 56, 361 91, G05F 170, H02H 709

Patent

active

045715351

ABSTRACT:
A device is taught for controlling the residual charge on a thyristor switched capacitor. A capacitor is in series circuit relationship with at least two bidirectional back-to-back thyristor switches which are then connected across an AC network. Each back-to-back thyristor combination is shunted by a non-linear clamping device which exhibits a very high resistance below a specified voltage level and a very low resistance above that voltage level. A pulse stretcher and a sequential firing circuit arrangement is used to prolong the conduction of one of the thyristor switches at a time to allow the shunting of its associated clamping device. During an overvoltage condition in the AC network, the residual charge on the capacitor will be limited to the breakdown voltage of the conducting clamping device. A plurality of capacitor, thyristor switch, non-linear clamping device combinations may be utilized in parallel with the AC network.

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