A Study of the Operation Mode of a Synchronous Compensator with Two Excitation Windings

Abstract

The magnetic rotor flux in synchronous compensators with two excitation windings can be rotated by force, which makes it possible to achieve a more favorable effect of the compensator on the generator in emergency modes. This option has to do with the additional electromagnetic capacity formed in the machines by triggering the excitation along the compensator’s second axis. The control must ensure a relatively stable and possibly larger value of the compensator-induced component of the generator’s electromagnetic capacity. Other things being equal, the peak value of this capacity of the generator will be the same as in the standard generator. In terms of improving the dynamic resistance of the power line, the second excitation winding will make it possible at best to use the positive peak of the indicated capacity component in the required period of time. The control of the compensator excitation according to the laws of the sine and cosine of the relative angle between the compensator rotor and the generator rotor, as well as the derivative longitudinal and transversal components of the stator currents, can increase the electromagnetic generator capacity by a relatively constant value. The process of control according to the laws of the sine and cosine of the compensator angle relative to the voltage vector of the receiving system, their derivatives, and the derivatives of the stator current components increases the amplitude of the generator angular characteristic as in the case of the reducing mutual reactivity between the generator and the receiving system. The voltage in the compensator contact rings depends mainly on the time constant of the compensator excitation winding and slide and can reach a fairly high level; in this case, the dynamic stability limit reaches the postemergency mode limit.