System and method for a dynamic switchable active front end—dynamic switchable active harmonic filtering system

1. A system for controlling a dynamic switchable active front end (DSAFE) and dynamic switchable active harmonic filter (DSAHF) on an oil rig, comprising:

a processor in data communication with a non-transitory computer readable medium;

a computer program comprising computer executable instructions stored in the computer readable medium for execution by the processor, the computer program comprising:

instructions to determine a status of a first load on a first DSAFE/DSAHF;

instructions to when the status of the first load is “present”, switch the DSAFE/DSAHF to act as a DSAFE to provide power to the first load;

instructions to when the status of the first load is “absent” of the first load, switch out the first load to remove the first load from the first DSAFE/DSAHF;

and instructions to switch the first DSAFE/DSAHF to act as a DSAHF to provide active filtering on the first DSAHF on alternating current (AC) power bus providing to the oil rig;

and

instructions to sense on the first DSAFE/DSAHF acting as a DSAHF, harmonic distortion using a current transformer on a common AC bus, generate anti-harmonic currents and inject the generated anti-harmonic currents on to the common AC bus to cancel the harmonic currents in the AC power supplied to a second DSAFE/DSAHF.

2. The system of claim 1 wherein the DSAFE/DSAHF is combination of a discrete active front end (AFE) and a discrete active harmonic filter (AHF).

3. The system of claim 1 wherein the DSAFE/DSAHF is an AFE integrated with an AHF.

4. The system of claim 3 , wherein the computer program determines the operation of the integrated DSAFE/DSAHF as a DSAFE and a DSAHF.

5. The system of claim 1 , the system further comprising:

an AC power grid that provides power to the DSAFE/DSAHF; and

an oil rig having equipment as load to which the DSAFE/DSAHF provides power from the AC grid to the load.

6. A non-transitory computer readable medium containing a computer program for execution by a processor, the computer program comprising:

instructions to determine a status of a first load on a first DSAFE/DSAHF;

instructions to when the status of the first load is “present”, switch the DSAFE/DSAHF to act as a DSAFE to provide power to the first load;

instructions to when the status of the first load is “absent” of the first load, switch out the first load to remove the first load from the first DSAFE/DSAHF;

and instructions to switch the first DSAFE/DSAHF to act as a DSAHF to provide active filtering on the first DSAHF on AC power bus providing to the oil rig;

and

instructions to sense on the first DSAFE/DSAHF acting as a DSAHF, harmonic distortion using a current transformer on a common AC bus, generate anti-harmonic currents and inject the generated anti-harmonic currents on to the common AC bus to cancel the harmonic currents in the AC power supplied to a second DSAFE/DSAHF.

7. The medium of claim 6 wherein the DSAFE/DSAHF is combination of an AFE and an AHF.

8. The medium of claim 6 wherein the DSAFE/DSAHF is an AFE with an AHF.

9. The medium of claim 8 , wherein the computer program determines the operation of the integrated DSAFE/DSAHF as a DSAFE and a DSAHF.

10. A method for controlling a dynamic switchable active front end and active harmonic filter on an oil rig, the method comprising:

determining on a processor status of a first load on a first DSAFE/DSAHF;

determining on the processor, when the status of the first load is “present” and switching the DSAFE/DSAHF to act as a DSAFE to provide power to the first load;

determining on the processor, when a status of the first load is “absent” of the first load and switching out the first load to remove the first load from the first DSAFE/DSAHF;

and instructions to switch the first DSAFE/DSAHF to act as a DSAHF to provide active filtering on the first DSAHF on AC power bus providing to the oil rig;

and

sensing on the processor, on the first DSAFE/DSAHF acting as a DSAHF, harmonic distortion using a current transformer on a common AC Bus, generate anti-harmonic currents and inject the generated anti-harmonic currents on to the common AC bus to cancel the harmonic currents in the AC power supplied to a second DSAFE/DSAHF.

11. The method of claim 10 wherein the DSAFE/DSAHF is combination of an AFE and an AHF.

12. The method of claim 10 wherein the DSAFE/DSAHF is an AFE with an AHF.