Power converter system for renewable energy sources
First Claim
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1. 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.
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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.
10 Citations
19 Claims
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1. A converter system for interconnecting renewable energy sources with a DC distribution bus being at least medium voltage level, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. 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. - View Dependent Claims (11, 12)
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13. 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:
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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. - View Dependent Claims (14, 15, 16, 17, 18)
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19. 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;
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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.
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Specification