US 12,003,096 B2 · Photovoltaic power generation system, photovoltaic inverter, and direct current combiner box

Abstract

A photovoltaic power generation system includes a protection switch and a plurality of DC-DC converters. Each DC-DC converter includes a direct current bus, a DC-DC circuit, and at least one input interface. The input interface is configured to connect to a photovoltaic unit. The photovoltaic unit includes at least one photovoltaic module. The input interface is connected to the direct current bus by using the protection switch, the direct current bus is connected to an input end of the DC-DC circuit, and an output end of the DC-DC circuit is an output end of the DC-DC converter. The protection switch includes a release device and a switching device that are connected in series. The release device is configured to: when a short-circuit fault occurs on a line in which the release device is located, control the switching device to be disconnected.

Claims20

Dependent claims

A photovoltaic power generation system, comprising:

a plurality of protection switches;
and
a plurality of DC-DC converters, wherein each DC-DC converter of the plurality of DC-DC converters comprises:
a direct current bus, and
a DC-DC circuit, comprising an input end connected to the direct current bus, and an output end of the DC-DC circuit connected to an output end of the plurality of DC-DC converters;
wherein the direct current bus configured to connect to a plurality of photovoltaic units via the protection switches, each photovoltaic unit comprising at least one photovoltaic module, each of the protection switches comprises a release device and a switching device, the release device is configured to release a holding mechanism when a protection action is triggered due to a short-circuit fault that occurs on a line in which the release device is located, and to disconnect the switching device so as to protect the photovoltaic unit, the line, or the photovoltaic power generation system.

3 more elements

A photovoltaic inverter, configured to connect to a photovoltaic unit, wherein the photovoltaic unit comprises at least one photovoltaic module, and the photovoltaic inverter comprises:

a plurality of protection switches;
a DC-AC converter;
and
a plurality of DC-DC converters, wherein each DC-DC converter of the plurality of DC-DC converters comprises:
a direct current bus,
a DC-DC circuit comprising an input end connected to the direct current bus, and an output end of the DC-DC circuit connected to an output end of the plurality of DC-DC converters,
positive ports of the output ends of the plurality of DC-DC converters are connected in parallel to a positive input port of the DC-AC converter, negative ports of the output ends of the plurality of DC-DC converters are connected in parallel to a negative input port of the DC-AC converter, and
the direct current bus configured to connect to a plurality of photovoltaic units via the protection switches, each photovoltaic unit comprising at least one photovoltaic module,
each of the protection switches comprises a release device and a switching device that are connected in series, and the release device is configured to release a holding mechanism when a protection action is triggered due to a short-circuit fault that occurs in a branch in which the release device is located, to disconnect the switching device in the fault branch so as to protect the photovoltaic units, the line, or a power generation system.

6 more elements

A protection control method for a power converter which configured to connect to a plurality of photovoltaic units with at least one photovoltaic module, and the power converter comprises a plurality of protection switches and a plurality of DC-DC converters, each DC-DC converter of the plurality of DC-DC converters comprises a direct current bus, a DC-DC circuit, and the photovoltaic units are connected to the direct current bus by the protection switches, the direct current bus is configured to connect to an input end of the DC-DC circuit, and an output end of the DC-DC circuit is an output end of the DC-DC converter, positive ports of the output ends of the plurality of DC-DC converters are connected in parallel to a positive output port of the power converter, negative ports of the output ends of the plurality of DC-DC converters are connected in parallel to a negative output port of the power converter, the protection switch comprises a release device and a switching device that are connected in series;

and the method comprises:
releasing a holding mechanism when a protection action is triggered due to a short-circuit fault that occurs in a branch which the release device is located, to disconnect the switching device in the faulted branch so as to protect the photovoltaic units, the line, or the power converter.

Dependencies are inferred from the claim text.

Photovoltaic power generation system, photovoltaic inverter, and direct current combiner box

Life of this patent

Photovoltaic power generation system, photovoltaic inverter, and direct current combiner box

Life of this patent

Abstract

Claims20