The three-phase synchronous generator set is in operation. In order to ensure that the voltage value is within the specified range, the generator set adjusts the voltage in different ways according to its designed structural performance. Then, how many voltage regulation methods are there for synchronous generator sets? CHENFENG, the manufacturer of diesel generator set, will explain it to you.

三相同步發電機組電壓自動調節器可分：可控硅自動調壓、TD1型碳阻式自動調壓、相復勵自動調壓等三類。下面柴油發電機廠家晨豐分別介紹這三種同步發電機電壓自動調節器工作原理。

The automatic voltage regulator of three-phase synchronous generator set can be divided into three categories: thyristor automatic voltage regulation, TD1 carbon resistance automatic voltage regulation and phase compound excitation automatic voltage regulation. Next, CHENFENG, a diesel generator manufacturer, introduces the working principles of the three automatic voltage regulators of synchronous generators.

A、可控硅自動調壓：

A. Thyristor automatic voltage regulation:

這種調壓方式是指利用串入或并入激磁回路的可控硅控制激磁電流，從而使發電機的輸出電壓隨負載的變化而進行自動調節。可控硅的控制方式有多種：一是利用單結晶體管組成的振蕩電路產生觸發脈沖，改變電容的充電電壓，從而控制觸發脈沖產生的時間，改變可控硅的導通角；二是利用三極管的開關特性，改變電容的充電電壓，控制三極管的導通時間而產生觸發脈沖，同樣也可以控制可控硅的導通角。

This voltage regulation means that the thyristor connected in series or incorporated into the excitation circuit is used to control the excitation current, so that the output voltage of the generator can be automatically adjusted with the change of load. There are many ways to control the thyristor: one is to use the oscillation circuit composed of single junction transistor to generate trigger pulse and change the charging voltage of capacitor, so as to control the generation time of trigger pulse and change the conduction angle of thyristor; The second is to use the switching characteristics of the triode to change the charging voltage of the capacitor and control the conduction time of the triode to generate the trigger pulse, which can also control the conduction angle of the thyristor.

三相同步發電機組調壓方式有幾種

There are several voltage regulation modes of three-phase synchronous generator set

B、TD1型碳阻式自動調壓：

B. TD1 carbon resistance automatic voltage regulation:

這種調壓方式在上柴SC柴油發電機組上有所運用，其工作原理是：當發電機負載為額定值時，電壓自動調節器保持穩定不動，這時發電機的激磁電流、電壓和主激磁電流都穩定不變。電機的負載增大，導致電壓降低，則電壓自動調節器開始調節碳片電阻，使其阻值減小，從而使發電機的激磁電流增大，促使發電機的輸出電壓上升；反之，負載減小時，電壓自動調節器便調節碳片電阻的阻值增大，從而使激磁電流減小，促使電壓下降。

This voltage regulation method is used in Shangchai SC diesel generator set. Its working principle is that when the generator load is rated, the automatic voltage regulator remains stable, and the excitation current, voltage and main excitation current of the generator are stable. When the load of the motor increases and the voltage decreases, the automatic voltage regulator starts to adjust the carbon sheet resistance to reduce its resistance value, so as to increase the excitation current of the generator and increase the output voltage of the generator; On the contrary, when the load is reduced, the automatic voltage regulator will adjust the resistance of the carbon sheet resistance to increase, so as to reduce the excitation current and reduce the voltage.

C、相復勵自動調壓：

C. Phase compound excitation automatic voltage regulation:

對于起動和運行中負載變化較大的特殊設備，采用相復勵自動調壓方式較好，所以目前在特殊設備供電中，發電機控制部分較多采用相復勵自動調壓方式。相復勵自動調壓的基本原理是：當發電機空載時，電樞抽頭繞組的剩磁電壓通過線性電抗器移相90°，經三相橋式整流器整流后，輸出的直流電流流向磁場繞組進行勵磁。當剩磁電壓太低時，可用直流電進行充電。當發電機組帶有負載時，其負載電流通過電流互感器的一次繞組產生一個和一次繞組電流成比例關系的二次電流，此電流能隨不同功率因數的負載變化時所需勵磁電流的大小而相應增減。在適當參數配合下，供給發電機所需的勵磁電流，故能自動調整電壓，使電壓在一定的范圍內保持穩定。由于它的這種特性，在工程建筑和特殊設備中應用得較多。

For special equipment with large load change during startup and operation, it is better to adopt the phase compound excitation automatic voltage regulation mode. Therefore, at present, in the power supply of special equipment, the generator control part mostly adopts the phase compound excitation automatic voltage regulation mode. The basic principle of phase compound excitation automatic voltage regulation is: when the generator is unloaded, the residual magnetic voltage of armature tap winding is shifted by 90 ° through linear reactor, rectified by three-phase bridge rectifier, and the output DC current flows to the magnetic field winding for excitation. When the remanence voltage is too low, DC can be used for charging. When the generator set is loaded, its load current generates a secondary current proportional to the current of the primary winding through the primary winding of the current transformer. This current can increase or decrease accordingly with the required excitation current when the load with different power factors changes. With the cooperation of appropriate parameters, it can supply the excitation current required by the generator, so it can automatically adjust the voltage and keep the voltage stable within a certain range. Because of its characteristics, it is widely used in engineering buildings and special equipment.