METHOD AND APPARATUS FOR CONTROLLING FORCED COMMUTATION TYPECURRENT SOURCE REACTIVE POWER GENERATOR

摘要

The non-linear control characteristic of a force commutated current source inverter operating as a var generator is linearized to provide a similar dynamic response in both leading and lagging modes of operation by two inter-related control schemes. The first control scheme comprises a linear closed loop feedback which controls a thyristor firing circuit in response to a difference or error signal between a var command signal and an actual var feedback signal while the second control comprises a feed-forward non-linear network having a signal transfer function which models the non-linear control characteristic of the var generator and is operative to control the thyristor firing circuit in response to the summation of scaled values of the var command signal and the actual var feedback signal and wherein the scaled values provide a combined gain which is equal to unity.