Diesel Generator Tech

Working principle of AVR The voltage regulator is an adjustment device that controls the generator output voltage within a specified range. Its function is to automatically control the generator voltage and keep it constant when the rotating speed of the generator changes, so as to prevent the generator voltage from being too high to burn out the electrical equipment and cause the battery to overcharge. At the same time, it also prevents the generator voltage from being too low, resulting in malfunctioning of electrical equipment and insufficient battery charge. Since the transmission ratio of generator to engine is fixed, the speed of generator will change with the change of engine speed. The power supply of generator to electric equipment and charging to battery both require its voltage to be stable, so it is necessary to adjust the output voltage of generator if the voltage is kept at a certain value basically. A synchronous generator regulator that maintains the sync...

Voltage Regulation Principle After the generator set starts, it relies on the residual magnetic voltage of the motor. After rectifying, it provides the excitation current to the magnetic field of the AC excitation machine, and the armature voltage of the AC excitation motor increases gradually. The AC voltage is fed into the host magnetic field after the rotation rectifier, which makes the main generator establish the voltage. When the speed is close to the rated value, the voltage regulator AVR makes the generator rise rapidly and stabilize at the rated value. The electrical principle is shown in the diagram. During normal operation of generator, if for some reason, such as load change, speed change, winding temperature change and so on, the generator terminal voltage will increase or decrease. Automatic voltage regulator AVR can detect this small voltage deviation and rapidly reduce or increase the excitation current to maintain the generator terminal voltage approximately...