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Photovoltaic System
| Content Provider | The Lens |
|---|---|
| Abstract | A photovoltaic system including multiple photovoltaic cell strings, a converter, a controller, and a bus is presented. The multiple photovoltaic cell strings include at least one string group in which parallel-connected photovoltaic cell strings are coupled to one current sensor, where the at least one string group, after being connected in parallel, is coupled to the converter using the bus, the current sensor is configured to detect a total current of each string group, the controller is configured to adjust, when receiving a report from the current sensor that a reverse current exists in a target string group in the at least one string group, a control signal output to the converter, and the converter is configured to decrease, according to an adjusted control signal, a system voltage between the buses to decrease the reverse current in the target string group. |
| Related Links | https://www.lens.org/lens/patent/013-969-155-565-497/frontpage |
| Language | English |
| Publisher Date | 2017-08-03 |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Patent |
| Jurisdiction | United States of America |
| Date Applied | 2017-04-21 |
| Applicant | Huawei Tech Co Ltd |
| Application No. | 201715493370 |
| Claim | A photovoltaic system, comprising: multiple photovoltaic cell strings comprising at least one string group in which a plurality of parallel-connected photovoltaic cell strings are coupled to one current sensor; a converter coupled to a current sensor in each string group in the at least one string group; a controller connecting to the converter; and buses coupled to the converter, the controller, and the at least one string group, wherein the at least one string group is connected in parallel with each other, wherein the current sensor is configured to: detect a total current of each string group; and report whether a reverse current exists in each string group to the controller, wherein the controller is configured to adjust a control signal output to the converter when receiving a report from the current sensor that a reverse current exists in a target string group in the at least one string group, and wherein the converter is configured to decrease, according to the adjusted control signal, a system voltage between the buses to decrease the reverse current in the target string group. The photovoltaic system according to claim 1 , wherein the multiple photovoltaic cell strings further comprise a string group in which one photovoltaic cell string is coupled to one current sensor, wherein the string group in which the one photovoltaic cell string is coupled to the one current sensor and the at least one string group in which two or three parallel-connected photovoltaic cell strings are coupled to one current sensor are connected using the bus, and wherein the current sensor in the string group in which one photovoltaic string is coupled to one current sensor is coupled to the controller. The photovoltaic system according to claim 1 , wherein the converter comprises a switching transistor, a first capacitor, an inductor, and a first diode, wherein one end of the inductor is coupled to an input end of the converter, wherein another end of the inductor is coupled to both a collector of the switching transistor and a positive electrode of the first diode, wherein a negative electrode of the first diode is coupled to one end of the first capacitor, and wherein another end of the first capacitor is coupled to both an emitter of the switching transistor and an output end of the converter. The photovoltaic system according to claim 1 , wherein the controller comprises: a processor configured to determine whether the reverse current in the target string group is higher than a preset threshold; and a driver coupled to the processor and configured to adjust the control signal output to the converter when the processor determines that the reverse current in the target string group is higher than the preset threshold. The photovoltaic system according to claim 4 , wherein the controller further comprises an analog to digital converter coupled to the processor and configured to: convert an analog signal of the reverse current reported by the current sensor into a digital signal of the reverse current; and output the digital signal of the reverse current to the processor. The photovoltaic system according to claim 3 , wherein the converter further comprises a second capacitor, wherein one end of the second capacitor is coupled to one end of the inductor, wherein another end of the second capacitor is coupled to the emitter of the switching transistor, and wherein the second capacitor is configured to perform filtering processing on an input voltage. A photovoltaic system, comprising: multiple photovoltaic cell strings comprising at least one string group in which two parallel-connected photovoltaic cell strings are coupled to one current sensor; a converter coupled to a current sensor in each string group in the at least one string group; a controller connecting to the converter; and buses coupled to the converter, the controller, and the at least one string group, wherein the at least one string group is connected in parallel to each other, wherein the current sensor is configured to detect a total current of each string group, wherein the controller is configured to adjust a control signal output to the converter when a reverse current is detected in a target string group in the at least one string group, and wherein the converter is configured to decrease, according to the adjusted control signal, a system voltage between the buses to decrease the reverse current in the target string group. The photovoltaic system according to claim 7 , wherein the multiple photovoltaic cell strings further comprise a string group in which one photovoltaic cell string is coupled to one current sensor, wherein the string group in which the one photovoltaic cell string is coupled to the one current sensor and the at least one string group in which two or three parallel-connected photovoltaic cell strings are coupled to one current sensor, after being connected in parallel, are coupled to the converter using the bus, and wherein the current sensor in the string group in which one photovoltaic string is coupled to one current sensor is coupled to the controller. The photovoltaic system according to claim 8 , wherein the converter comprises a switching transistor, a first capacitor, an inductor, and a first diode, wherein one end of the inductor is coupled to an input end of the converter, wherein another end of the inductor is coupled to both a collector of the switching transistor and a positive electrode of the first diode, wherein a negative electrode of the first diode is coupled to one end of the first capacitor, and wherein another end of the first capacitor is coupled to both an emitter of the switching transistor and an output end of the converter. The photovoltaic system according to claim 7 , wherein the controller comprises: a processor configured to determine whether the reverse current in the target string group is higher than a preset threshold; and a driver coupled to the processor and configured to adjust the control signal output to the converter when the processor determines that the reverse current in the target string group is higher than the preset threshold. The photovoltaic system according to claim 10 , wherein the controller further comprises an analog to digital converter, wherein the analog to digital converter is coupled to the processor and configured to: convert an analog signal of the reverse current reported by the current sensor into a digital signal of the reverse current; and output the digital signal of the reverse current to the processor. The photovoltaic system according to claim 9 , wherein the converter further comprises a second capacitor, wherein one end of the second capacitor is coupled to one end of the inductor, wherein another end of the second capacitor is coupled to the emitter of the switching transistor, and wherein the second capacitor is configured to perform filtering processing on an input voltage. A photovoltaic system, comprising: multiple photovoltaic cell strings comprising at least one string group in which three parallel-connected photovoltaic cell strings are coupled to one current sensor; a converter coupled to a current sensor in each string group in the at least one string group; a controller connecting to the converter; and buses coupled to the converter, the controller, and the at least one string group, wherein the at least one string group is connected in parallel with each other, wherein the current sensor is configured to: detect a total current of each string group; and report whether a reverse current exists in each string group to the controller, wherein the controller is configured to adjust a control signal output to the converter when receiving a report from the current sensor that a reverse current exists in a target string group in the at least one string group, and wherein the converter is configured to decrease, according to the adjusted control signal, a system voltage between the buses to decrease the reverse current in the target string group. The photovoltaic system according to claim 13 , wherein the multiple photovoltaic cell strings further comprise a string group in which one photovoltaic cell string is coupled to one current sensor, wherein the string group in which the one photovoltaic cell string is coupled to the one current sensor and the at least one string group in which two or three parallel-connected photovoltaic cell strings are coupled to one current sensor are connected using the bus, and wherein the current sensor in the string group in which one photovoltaic string is coupled to one current sensor is coupled to the controller. The photovoltaic system according to claim 13 , wherein the converter comprises a switching transistor, a first capacitor, an inductor, and a first diode, wherein one end of the inductor is coupled to an input end of the converter, wherein another end of the inductor is coupled to both a collector of the switching transistor and a positive electrode of the first diode, wherein a negative electrode of the first diode is coupled to one end of the first capacitor, and wherein another end of the first capacitor is coupled to both an emitter of the switching transistor and an output end of the converter. The photovoltaic system according to claim 13 , wherein the controller comprises: a processor configured to determine whether the reverse current in the target string group is higher than a preset threshold; and a driver coupled to the processor and configured to adjust the control signal output to the converter when the processor determines that the reverse current in the target string group is higher than the preset threshold. The photovoltaic system according to claim 16 , wherein the controller further comprises an analog to digital converter coupled to the processor and configured to: convert an analog signal of the reverse current reported by the current sensor into a digital signal of the reverse current; and output the digital signal of the reverse current to the processor. The photovoltaic system according to claim 15 , wherein the converter further comprises a second capacitor, wherein one end of the second capacitor is coupled to one end of the inductor, wherein another end of the second capacitor is coupled to the emitter of the switching transistor, and wherein the second capacitor is configured to perform filtering processing on an input voltage. |
| CPC Classification | GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION; VISIBLE LIGHT OR ULTRAVIOLET LIGHT; e.g. USING PHOTOVOLTAIC [PV] MODULES CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER;SYSTEMS FOR STORING ELECTRIC ENERGY Reduction Of Greenhouse Gas [Ghg] Emissions; Related To Energy Generation; Transmission Or Distribution APPARATUS FOR CONVERSION BETWEEN AC AND AC; BETWEEN AC AND DC; OR BETWEEN DC AND DC; AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS;CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER;CONTROL OR REGULATION THEREOF |
| Extended Family | 013-969-155-565-497 040-630-587-053-256 149-544-945-197-447 079-808-265-406-611 016-400-998-227-229 048-738-894-640-755 156-722-080-804-780 |
| Patent ID | 20170222440 |
| Inventor/Author | Shi Lei Ye Fei Liu Yunfeng |
| IPC | H02J3/38 H02M1/084 H02M3/04 H02M7/44 |
| Status | Discontinued |
| Owner | Huawei Technologies Co. Ltd |
| Simple Family | 013-969-155-565-497 040-630-587-053-256 149-544-945-197-447 079-808-265-406-611 016-400-998-227-229 048-738-894-640-755 156-722-080-804-780 |
| CPC (with Group) | H02S50/00 H02J2300/24 H02J3/381 Y02E10/56 H02J3/46 H10F77/955 Y02E10/50 H02M1/0009 H02M1/084 H02M3/04 H02M7/44 |
| Issuing Authority | United States Patent and Trademark Office (USPTO) |
| Kind | Patent Application Publication |
