HYBRID ELECTRIFICATION SYSTEM OF PUMP STATION AND OPTIMAL OPERATION METHOD THEREOF

1 . A hybrid electrification system of pump station, comprising:

a central controller;

a shared Variable Frequency Drive (VFD) busbar; and

a common busbar, wherein the shared VFD busbar and the common busbar connect to said central controller; and

wherein said shared VFD busbar is shared by two or more motor-pump chains and selectively drives one or more said motor-pump chains.

2 . The system according to claim 1 , wherein said common busbar is supplied by a transformer with an On-Load Tap Changer.

3 . The system according to claim 1 , wherein each of said motor-pump chain connects to a Single Pole Three Throw switch, which switches said motor-pump chain among the common busbar the shared VFD busbar.

4 . The system according to claim 3 , further comprising:

a motor-pump chain supplied by an un-shared VFD.

5 . The system according to claim 4 , wherein said un-shared VFD connects to said common busbar directly.

6 . The system according to claim 4 , wherein said un-shared VFD is driven by a separate transformer without connection to said common busbar.

7 . A method to optimize an operation efficiency of a pump station, comprising:

preprocessing initial data input by user;

forecasting a liquid load or getting a predefined liquid load demand of next time interval;

wherein forecasting includes:

calculating parameters of a pump station with liquid pipe resistance curve; and

updating a pump list by calculating parameters of motor-pump chains with or without a shared VFD for maximum efficiency;

calculating -fee-control commands of the pump station; and

executing the control commands by controlling at least one of the shared VFD, an On-Load Tap Changer or a Single Pole Three Throw switch.

8 . The method according to claim 7 , wherein said preprocessing includes:

collecting parameters of pumps with a shared VFD busbar;

collecting parameters of pumps with a un-shared VFD busbar;

collecting parameters of pumps with a common busbar supplied by the On-Load Tap Changer;

identifying pipe resistance parameters; and

defining a number of motor-pump chain directly driven by the shared and un-shared VFD busbars to achieve a partial optimization requirement.

9 . (canceled)

10 . The method according to claim 7 , wherein said calculating includes three options in sequence to meet the load demand:

1) adjusting the shared VFD busbar which meets load demand;

2) adjusting the shared VFD busbar and the On-Load Tap Changer which meets load demand; and

3) recalculating the control commands for the pump station, including the shared VFD busbar, the On-Load Tap Changer and the Single Pole Three Throw switch.

11 . The method according to claim 10 , wherein said recalculating includes:

initializing the pump list;

calculating a remaining liquid flow demand; and

calculating a pump list parameter to achieve maximum efficiency.

12 . The method according to claim 7 , wherein said executing includes:

adjusting a frequency of the motor-pump chain which connects to a system frequency at least one of the shared VFD busbar or the un-shared VFD busbar; and

adjusting a voltage of common busbar for the On-Load Tap Changer operation according to the voltage requirement.

13 . The method according to claim 11 , further including:

selecting the motor-pump chain with a highest efficiency with or without a shared VFD busbar.

14 . The method according to claim 11 , further including:

doing partial optimization for finding a most efficient list to provide the remaining liquid flow demand.

15 . The system according to claim 3 , wherein the Single Pole Three Throw switch includes at least one of a connect or a disconnect of the common busbar.

16 . The system according to claim 3 , wherein the Single Pole Three Throw switch includes at least one of a connect or a disconnect of the shared VFD busbar.