Investigation of series compensation of DC converter station

This thesis systematically investigates the ferro-resonance performance in an AC/DC system, and analyses the different effects of system elements on ferro-resonance. Basically, the transformer saturation and the load rejection are the prerequisites of a ferro-resonance.;These methods can effectively eliminate the ferro-resonance in different fault recovery processes of AC/DC systems. Now the only concern is that subsynchronous damping schemes may increase the cost. Economic evaluation at the end of the thesis shows that the economic solution for ferro-resonance does exist. (Abstract shortened by UMI.).;This thesis presents the results of several mitigative methods of the digitally-simulated performance of the following schemes: (1) Shunt or series subharmonic filter; (2) Metal oxide varistor (MOV); (3) C-type filter; (4) Series damping filter scheme; (5) Parallel damping filter scheme; (6) Shunt 2nd harmonic filter; (7) With optimal control parameters in the DC system; (8) Switching resistor scheme; (9) Thyristor controlled resistor; (10) Fundamental blocking filter; (11) Protective bypass together with Pre-insertion resistor.