Power converter system for renewable energy sources
AssigneeABB Schweiz AG
InventorsFrancisco Canales, Frederick Kieferndorf, Drazen Dujic
Life of this patent
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Abstract
A converter system for interconnecting renewable energy sources with a DC distribution bus comprises a converter unit which comprises an isolated DC-to-DC converter connectable to the renewable energy source, and a non-isolated DC-to-DC converter connectable to the DC distribution bus, which is cascade connected with the isolated DC-to-DC converter.
Claims19
A converter system for interconnecting renewable energy sources with a DC distribution bus being at least medium voltage level, comprising:
- a converter unit for interconnecting a renewable energy source with the DC distribution bus;
- wherein the converter unit comprises:
- an isolated DC-to-DC converter connectable to the renewable energy source;
- and
- a non-isolated DC-to-DC converter connectable to the DC distribution bus, which is cascade connected with the isolated DC-to-DC converter.
A superior converter system,
- comprising:
- at least two DC distribution buses, each DC distribution bus connected to a converter system comprising at least one converter unit for interconnecting a renewable energy source with a respective DC distribution bus, each respective DC distribution bus being at least at medium voltage level
- wherein the at least one converter unit comprises an isolated DC-to-DC converter connectable to the renewable energy source and a non-isolated DC-to-DC converter connectable to the DC distribution bus, which is cascade connected with the isolated DC-to-DC converter;
- wherein each DC distribution bus is connected to a first side of a non-isolated grid-side DC-to-DC converter;
- wherein second sides of the non-isolated grid-side DC-to-DC converters are connected in series between lines of a DC distribution grid.
A method of operating a converter system, wherein the converter system comprises a converter unit for interconnecting a renewable energy source with a DC distribution bus, wherein the converter unit comprises a first isolated DC-to-DC converter connectable to the renewable energy source and a second non-isolated DC-to-DC converter connectable to the DC distribution bus, which are cascade connected, the method comprising:
- controlling the first DC-to-DC converter in open loop;
- and
- controlling a power gain of the converter unit with the second DC-to-DC converter.
A controller for a converter system or a superior converter system, wherein the converter system or the superior converter system comprises a converter unit for interconnecting a renewable energy source with a DC distribution bus, wherein the converter unit comprises a first DC-to-DC converter connectable to the renewable energy source and a second DC-to-DC converter connectable to the DC distribution bus, which are cascade connected;
- wherein the controller is operable to control the first DC-to-DC converter in open loop;
- and
- wherein the controller is operable to control a power gain of the converter unit with the second DC-to-DC converter.
Dependencies are inferred from the claim text.