The present invention relates to an automatic device for depressing low frequency oscillation of power system. It consists of an electronic circuit incorporated in the original excitation regulator of a synchronous generator. This circuit can turn the input deviation of voltage .DELTA.V into simulating...http://www.google.de/patents/US4701689?utm_source=gb-gplus-sharePatent US4701689 - Optimal control power system stabilizer and method using simulating state variables
