2) When the output reaches 80-90% of the rated value, the second generator (F2) can be started, and when the speed and voltage of F2 reach the rated value, it can be ready for grid-connected operation;
3) Check the voltage and phase sequence of the two generators to make them the same, adjust the voltage of F2 to be slightly higher than the voltage of F 1, and close the parallel switch when the gear synchronization indication is close to zero; After parallel connection, the two generators will run synchronously; Adjust the excitation current of F2, slightly increase and decrease F 1, and keep the grid voltage unchanged. At the same time, if the throttle of diesel engine is adjusted, the throttle of F2 will increase, while the throttle of F 1 will decrease, thus transferring part of the load to F2. Until the load of the two generators is almost the same. (When the power of two generators is different, let the load be distributed in proportion. )
4) When the load of two generators reaches 90%, the third generator can be started, and the above operation is repeated in the grid connection mode.
Note: 1) The generator is not connected to the grid when it is empty, because it is impossible to adjust the voltage of the generator to be exactly the same. When the generators are connected to the grid, there will be circulation between the two generators, one generating electricity and the other working.
2) Load transfer between generators needs to adjust not only its excitation current, but also the throttle of diesel engine, so that the input power of generators increases or decreases and its output power changes accordingly. It is necessary to adjust two generators at the same time to keep the grid voltage and frequency unchanged.