同步发电机组并列（Synchronous generator set）.docVIP

同步发电机组并列（Synchronous generator set） One: tied 1, synchronous generator unit should be followed by the following principles: (1) parallel circuit breaker closing, the impact current should be as small as possible, its instantaneous maximum shall not exceed 1~~2 times the rated current. (2) when the generator sets into the power grid, it should be able to quickly enter the synchronous operation state, and its transient process is short, so as to reduce the disturbance to the power system. 2, two (1) to be defined, and generating unit has been coupled with the excitation current, the output voltage of Ug, load state parameters regulating generators Ug to parallel conditions and the generator into the operation of the system. (used for parallel generators or for systems). (2) the ideal condition is equal to 1. The frequency is equal to 2, the voltage amplitude is equal to 3, and the phase angle difference is 0 3, the generator does not satisfy the desired parallel conditions (1) voltage range, and the other two meet. The angle between Ih and Ug is 90., mainly reactive current. The harm of reactive current: the electric power of the impact current affects the generator winding, the mechanical strength of the stator winding is affected, and the impulse current flows through the stator and rotor to generate additional heating. Restraint condition: the pressure difference parallel impact current is not allowed to exceed 1/10 to 1/20 of the short-circuit current at the end of the machine. (2) the phase angle difference is not 0, and the other two are in line. The angle between Ih and Ug is nearly equal to 0., mainly the active current. The harm of the active current: after the switch on, the generator immediately outputs active power to the grid, which makes the shaft of the unit be impacted suddenly, and also has an impact on the power grid, which is equivalent to a disturbance under steady state. (3) the frequency is unequal, and the other two matches. In the case of slip,