Problem of power supply system’s safety and quality of control has taken on special significance due to development and complication of electropower systems. The effective decision of this problem is prevented by deficient controllability with anticrush automatics existing devices in emergency conditions because of the limited basic possibilities. The further development of anticrush control systems for new, better control principles’s and facilities’s creation is required. The synchronous generator excitation system’s regulation is an integral part in power supply system stability’s increase questions. The work consists of Kegum AES’s synchronous generator excitation system’s two models’ formation. In the work AES regulation channels in emergency and after emergency conditions, which are caused by different kinds of perturbation, is carried out. Both regulators give the chance to analyse stability of Kegum’s HES synchronous generator. In the work is considered the synchronous generator’s excitation pressure regulation’s possibility by a regulator which determinates generator’s calculated capacity of deficiency and measurly influences an excitation winding. As a result, is proved that the given regulation type is effective and is in the same rate as previous AES regulators