What is The Regulation of Synchronous Generator 1

We will introduce you to the regulation of synchronous generators. Synchronous generators are allowed to carry various electrical loads within their rated load range. The input characteristics of these loads will directly affect the output voltage of the generator; when the load is purely resistive, because the stator terminal voltage-armature terminal voltage of the synchronous generator is in phase with the load current, the first half of the rotor magnetic field is made It is weakened by the stator magnetic field, and the second half is strengthened by the stator magnetic field. The average value of the composite magnetic field remains unchanged within a week, and the output voltage of the generator remains unchanged. When the load is purely inductive, the stator magnetic field weakens the rotor magnetic field because the load current lags the armature terminal voltage by 90°, and the resultant magnetic field decreases, causing the generator output voltage to drop. If the load is purely capacitive, the load current will lead the armature terminal voltage by 90°, so that the stator magnetic field strengthens the rotor magnetic field, the resultant magnetic field increases, and the generator output voltage increases. It can be seen that the synthetic magnetic field is an important factor that changes the performance of the generator. The main role in the synthetic magnetic field is the rotor magnetic field, that is, the main magnetic field. Therefore, by adjusting the rotor magnetic field, the output voltage of the synchronous generator can be adjusted to improve its load capacity, so as to achieve the purpose of stabilizing the output voltage of the generator within the rated load range.

Excitation of the synchronous generator rotor: The so-called excitation is the process of providing DC power to the synchronous generator rotor to generate a DC electromagnetic field. The coil in the groove of the rotor of the synchronous generator is supplied with direct current by a special device called the exciter to form a direct current magnetic field. The early generators used a separate exciter to provide DC power to the rotor coil, and the system was large and complex. With the advancement of technology, modern synchronous generators are assembled with generators and exciters to form a complete generator.

The exciter is actually a small generator, and its working principle is the same as that of a synchronous generator. The difference is that its stator coil and rotor coil play the opposite role as the synchronous generator—the main generator; the stator coil of the exciter fixed beside the stator of the main generator is energized by direct current to form a direct current magnetic field, and is installed in the main generator. The rotor coil of the exciter on the rotor shaft of the main generator becomes the armature of the output electromotive force. A small and uniform gap is also maintained between the rotor of the exciter and the inner wall of the stator. This is also known as a brushless synchronous generator of rotating armature structure. The direct current of the stator coil of the exciter installed next to the stator of the main generator is obtained by rectifying part of the output voltage of the stator coil of the main generator, that is, the armature. The rotor coil of the exciter installed coaxially with the rotor of the main generator rotates in the magnetic field generated by the stator coil, and the induced electromotive force generated by cutting the magnetic field lines is converted into a DC current by the rectifier installed coaxially next to it, that is, the rotating rectifier, and the output is The rotor coils to the main generator cause it to generate a DC rotor magnetic field. So as to meet the requirements of the main generator rotor coil excitation.

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