Brief description of generator excitation system
Brief description of generator excitation system
Dongguan generator rentalMaintaining the voltage level of the generator's excitation system is its main task for three main reasons:Ensure the safety of power system operating equipment. Power system operating equipment has its rated operating voltage. Maintaining the voltage of the generator and its power system equipment at the allowable level is one of the basic conditions. Therefore, the voltage of the generator should be maintained at a given Allowable levels, whether static or dynamic, the operating voltage of large generators should not be higher than 110% of the rated value to maintain economical operation of the generator. If the voltage drops, the stator current required to output the same power will increase, Thereby increasing losses. The voltage of large generators should not be lower than 90% of the rated value. When it is lower than 95%, the generator should be restricted from running under load.
The excitation system of Dongguan generator rental plays an important role in improving the static, dynamic and transient performance of the system. It is a simple and effective measure.The impact of the excitation control system on transient stability. Transient stability depends on whether the acceleration zone is smaller than or equal to the deceleration zone. Therefore, there are two ways to improve transient stability: one is to reduce the acceleration area and quickly eliminate faults; 2 is to increase the deceleration area, increase the excitation voltage response ratio of the excitation system, and increase the strong excitation voltage multiple, so that the internal potential EQ of the generator increases rapidly after the fault is removed, thus increasing the deceleration area. Strong excitation is generally high voltage. 7-9 times.
The impact of the excitation control system on the dynamic stability of Dongguan generator rental. The dynamic stability of the power system can be said to be the damping problem of the electromechanical oscillation of the power system. The role of automatic voltage regulation in the excitation control system is to weaken the electromechanical oscillation damping of the power system ( Even negative) is an important reason. Under certain operating modes and excitation system parameters, voltage regulation can keep the generator voltage constant and produce a negative damping effect. Within the normal practical range, the negative damping effect of the excitation voltage increases with the open-loop The gain increases with the increase. Therefore, the requirements for improving voltage regulation accuracy and dynamic stability are incompatible. To solve the contradiction between voltage regulation accuracy and dynamic stability, it is to not affect the voltage regulation function and maintain the generator Under the premise of voltage capability, the control signal is added to make the dynamic stability reach or exceed the static stability level.