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A sub-sea power delivery system includes a plurality of modular power converter building blocks on each of the power source side and the sub-sea load side that are stacked and interconnected to meet site expansion requirements and electrical load topologies. The power delivery system comprises a sys

A sub-sea power delivery system includes a plurality of modular power converter building blocks on each of the power source side and the sub-sea load side that are stacked and interconnected to meet site expansion requirements and electrical load topologies. The power delivery system comprises a system DC transmission link/bus, wherein the system DC link is configured to carry HVDC or MVDC power from an onshore utility or topside power source to multiple sub-sea load modules. The stacked modular power converter topology on the sub-sea side of the sub-sea power delivery system is symmetrical with the stacked modular power converter topology on the on-shore/top-side of the sub-sea power delivery system.

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1. A power delivery system comprising an AC power source configured to deliver power to one or plural AC loads via a DC transmission bus, the DC transmission bus comprising a sending end and a receiving end, the sending end coupled to a plurality of modular power converters configured in a stacked m

1. A power delivery system comprising an AC power source configured to deliver power to one or plural AC loads via a DC transmission bus, the DC transmission bus comprising a sending end and a receiving end, the sending end coupled to a plurality of modular power converters configured in a stacked modular power converter topology, the receiving end coupled to a plurality of modular power converters configured in a stacked modular power converter topology, wherein the stacked modular power converter topology at the receiving end is symmetrical with the stacked modular power converter topology at the sending end, and wherein at least one receiving end modular power converter comprises a switching mechanism that is configured to operate as a modular power converter bypass switch, and further configured to regulate a DC link voltage for a corresponding modular stacked power converter. 2. The power delivery system according to claim 1, wherein one or more AC loads are directly connected to one or more corresponding receiving end modular converters. 3. The power delivery system according to claim 1, wherein one or more AC loads are connected to one or more corresponding receiving end modular converters via at least one transformer. 4. The power delivery system according to claim 1, wherein the modular power converter topology at the receiving end of the DC transmission bus comprises a DC to DC conversion stage configured to provide an intermediate DC distribution bus. 5. The power delivery system according to claim 4, wherein the modular power converter topology at the receiving end of the DC transmission bus further comprises a DC to AC conversion stage configured to provide an AC bus. 6. The power delivery system according to claim 5, further comprising an AC to DC conversion stage coupled to an AC output of the DC to AC conversion stage. 7. The power delivery system according to claim 4, wherein the plurality of stacked modular power converters at the receiving end of the DC transmission bus further comprise one or a plurality of DC to AC converters coupled to the intermediate DC distribution bus and configured to drive one or more sub-sea loads. 8. The power delivery system according to claim 7, wherein the sub-sea loads are coupled to the DC transmission bus via a ring structure via corresponding power converters. 9. The power delivery system according to claim 7, wherein the receiving end further comprises one or more isolation transformers configured to isolate one or more sub-sea loads from the intermediate distribution bus. 10. The power delivery system according to claim 9, wherein each transformer and a corresponding stacked modular power converter to which the transformer is coupled together are configured to operate at a low frequency at or below about 60 Hz. 11. The power delivery system according to claim 9, wherein each transformer and a corresponding stacked modular power converter to which the transformer is coupled together are configured to operate at a medium frequency between about 200 Hz and about 1 kHz. 12. The power delivery system according to claim 9, wherein each transformer and a corresponding stacked modular power converter to which the transformer is coupled together are configured to operate at a high frequency between about 5 kHz and about 20 kHz. 13. The power delivery system according to claim 1, wherein the receiving end of the DC transmission bus further comprises an intermediate AC distribution bus, each receiving end modular converter configured together with a corresponding transformer, the receiving end modular converters and corresponding transformers configured together to provide the intermediate AC distribution bus. 14. The power delivery system according to claim 13, wherein each transformer and a corresponding stacked modular power converter to which the transformer is coupled together are configured to operate at a low frequency at or below about 60 Hz. 15. The power delivery system according to claim 13, wherein each transformer and a corresponding stacked modular power converter to which the transformer is coupled together are configured to operate at a medium frequency between about 200 Hz and about 1 kHz. 16. The power delivery system according to claim 13, wherein each transformer and a corresponding stacked modular power converter to which the transformer is coupled together are configured to operate at a high frequency between about 5 kHz and about 20 kHz. 17. The power delivery system according to claim 13, wherein each stacked modular power converter is configured to operate in an interleaved gating pattern with respect to each other stacked modular power converter. 18. The power delivery system according to claim 13 wherein each stacked modular power converter is configured to operate in a non-interleaved gating pattern with respect to each other stacked modular power converter. 19. The power delivery system according to claim 13, wherein each stacked modular power converter is configured to operate in a phase-shifted gating pattern with respect to each other stacked modular power converter. 20. The power delivery system according to claim 1, wherein the receiving end comprises: a plurality of separated intermediate DC distribution buses, each separated intermediate DC distribution bus comprising a modular DC/AC converter configured together with a corresponding transformer and a corresponding rectifier mechanism to provide a corresponding intermediate DC distribution bus; andan intermediate AC distribution bus comprising one or more modular DC/AC converters and corresponding transformers configured together to provide the intermediate AC distribution bus. 21. The power delivery system according to claim 20, wherein the intermediate AC distribution bus is configured to operate at a low frequency at or below about 60 Hz in response to operation of the one or more modular DC/AC converters and corresponding transformers. 22. The power delivery system according to claim 20, wherein each intermediate AC distribution bus is configured to operate at a medium frequency between about 200 Hz and about 1 kHz in response to operation of the one or more modular DC/AC converters and corresponding transformers. 23. The power delivery system according to claim 20, wherein each intermediate AC distribution bus is configured to operate at a high frequency between about 5 kHz and about 20 kHz in response to operation of the one or more modular DC/AC converters and corresponding transformers. 24. The power delivery system according to claim 20, wherein each modular stacked converter is configured to operate with an interleaved gating pattern with respect to the other modular stacked converters. 25. The power delivery system according to claim 20, wherein each modular stacked converter is configured to operate with a non-interleaved gating pattern with respect to the other modular stacked converters. 26. The power delivery system according to claim 1, wherein the sending end further comprises at least one bypass switch configured to provide a bypass path around a corresponding failed sending end modular power converter. 27. The power delivery system according to claim 1, wherein at least one receiving end modular converter is configured both as a power converter and as an integrated variable speed drive to control a corresponding sub-sea load. 28. The power delivery system according to claim 1, wherein each receiving end modular converter is a DC to DC converter configured to reduce a high voltage DC or a medium voltage DC transmission voltage to a DC distribution voltage associated with a corresponding variable speed drive to control a corresponding sub-sea load. 29. The power delivery system according to claim 1, wherein each receiving end modular converter is configured to operate in an interleaved fashion with respect to at least one other receiving end modular converter. 30. The power delivery system according to claim 1, wherein the receiving end stacked modular power converters are together configured as a coupling mechanism between a medium voltage DC or high voltage DC transmission voltage and desired sub-sea load voltages. 31. The power delivery system according to claim 30, wherein each receiving end modular power converter comprises a DC to AC inverter. 32. The power delivery system according to claim 30, wherein the desired sub-sea load voltages comprise both MVDC voltages and MVAC voltages. 33. The power delivery system according to claim 1, wherein the receiving end stacked modular power converters are configured to accommodate both medium voltage (MV) DC or high voltage (HV) DC sub-sea loads and MVAC or HVAC sub-sea loads. 34. The power delivery system according to claim 1, wherein the modular stacked power converters at the receiving end are configured to operate such that unwanted harmonic signals are substantially canceled on the DC transmission bus, and at the AC power source. 35. The power delivery system according to claim 1, wherein the sending end further comprises a plurality of polygon transformers, wherein the plurality of polygon transformers are configured to generate spatially phase shifted AC signals, and the sending end modular stacked power converters are configured to generate timing phase shifted signals such that together the spatially phase shifted AC signals and the timing phase shifted signals substantially cancel harmonic signals on the DC bus. 36. The power delivery system according to claim 1, wherein the modular stacked power converters are configured to operate as AC to DC converters, DC to DC converters, or DC to AC converters.