Power conversion system and method of operating the same

A renewable energy generation facility comprising:

• a direct current (DC) bus;
• a plurality of renewable energy generation devices;
• a plurality of direct current (DC)-to-DC (DC/DC) power converters, each DC/DC power converter of said plurality of DC/DC power converters coupled to at least one renewable energy generation device of said plurality of renewable energy generation devices, said each DC/DC power converter configured to shift a switching operation between full-wave conversion and half-wave conversion, each DC/DC power converter of said plurality of DC/DC power converters is coupled to said DC bus via a diode stack, wherein the diode stack is directly connected to an output terminal of the DC/DC power converter of said plurality of DC/DC power converters and blocks electric power flow from the said DC bus to the DC/DC power converter of said plurality of DC/DC power converters and allows only unidirectional transmission of electric power from respective DC/DC power converter to the DC bus;
• and
• at least one controller coupled to said at least one DC/DC power converter, said at least one controller configured to regulate shifting the switching operation of said at least one DC/DC power converter between full-wave conversion and half-wave conversion.

A medium voltage direct current (MVDC) collector system for renewable power generation facilities, said MVDC collector system comprising:

• at least one renewable energy generation device;
• at least one direct current (DC)-to-DC (DC/DC) power converter coupled to said at least one renewable energy generation device, said at least one DC/DC power converter configured to shift a switching operation of said DC/DC power converter between full-wave conversion and half-wave conversion;
• at least one controller coupled to said at least one DC/DC power converter, said at least one controller configured to regulate shifting the switching operation of said at least one DC/DC power converter between full-wave conversion and half-wave conversion;
• and
• wherein said at least one DC/DC power converter comprises a first half-bridge resonant converter and a second half-bridge resonant converter coupled in series to said at least one renewable energy generation device;
• wherein the first half-bridge resonant converter includes a first resonant capacitive device and a first high frequency transformer;
• and
• wherein the second half-bridge resonant converter includes a second resonant capacitive device different than the first resonant capacitive device and a second high frequency transformer different than the first high frequency transformer.