# US 2023/0058643 A1 · Photovoltaic power generation system and method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2023/0058643 A1 - Document ID: US20230058643A1 - Status: Published application - Kind: A1 - Application number: 17/980,812 - Filed: 2022-11-04 - Published: 2023-02-23 - Earliest claimed: 2020-05-08 - Assignees: Huawei Digital Power Technologies Co., Ltd. - Applicants: Huawei Digital Power Technologies Co., Ltd. - Inventors: Xiaofeng YAO; Yang CHENG; Guozhao DUAN - Web page: https://patentgrep.com/patent/US20230058643A1 ## CPC - H02J 3/381: {Dispersed generators} - H02J 1/10: Parallel operation of DC sources - H02J 3/001: Arrangements for handling faults or abnormalities, e.g. emergencies or contingencies - H02J 3/00125: {Transmission line or load transient problems, e.g. overvoltage, resonance or self-excitation of inductive loads (H02J3/01 takes precedence)} - H02M 1/007: {Plural converter units in cascade (push-pull DC/DC converters with pre-regulator H02M3/3374; DC-AC converters following a DC-DC stage including a high frequency transformer H02M7/4807; DC-AC converters following a DC-DC conversion stage generating periodically varying voltages H02M7/4826)} - H02M 1/0077: {Plural converter units whose outputs are connected in series} - H02M 1/32: Means for protecting converters other than automatic disconnection - H02M 3/155: using semiconductor devices only - H02M 7/537: using semiconductor devices only, e.g. single switched pulse inverters - H02J 2101/24: Photovoltaics - Y02E 10/56: Power conversion systems, e.g. maximum power point trackers - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - H02M: 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 (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P) - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract This application discloses a photovoltaic power generation system and method, and the system includes an inverter and at least one shutdown apparatus. A type of the shutdown apparatus includes at least one of a shutdown device and an optimizer; and an input end of each shutdown apparatus is connected to a corresponding PV module, and power of the corresponding PV module is output. In the system, when a parameter of the inverter meets a preset condition, some shutdown apparatuses are turned off to lower an input voltage of the inverter, and ensure that an input end of the inverter has a direct current source, and the system can operate as usual; and the preset condition is that the input voltage of the inverter is greater than a first preset voltage, or an input current of the inverter is less than a first preset current. ## Claims ### Claim 1 A photovoltaic (PV) power generation system, comprising an inverter and at least one shutdown apparatus, wherein a type of the shutdown apparatus is at least one of a shutdown device or an optimizer; an input end of each shutdown apparatus is used to connect to a corresponding PV module, and power of the corresponding PV module is output; output ends of all PV modules are connected to corresponding shutdown apparatuses, and output ends of all the shutdown apparatuses are connected in series to an input end of the inverter; when a parameter of the inverter meets a preset condition, some of the shutdown apparatuses are turned off, so as to lower an input voltage of the inverter; and the preset condition is that the input voltage of the inverter is greater than a first preset voltage or an input current of the inverter is less than a first preset current; or the PV module comprises a first part of PV modules and a second part of PV modules, an output end of each PV module in the first part of PV modules is connected to an input end of a corresponding shutdown apparatus, and output ends of all the shutdown apparatuses are connected in series to form a first output end; the second part of PV modules comprises at least one PV module, and when the second part of PV modules comprises a plurality of PV modules, all PV modules in the second part of PV modules are directly connected in series to form a second output end; the first output end and the second output end are connected in series to an input end of the inverter; and when a parameter of the inverter meets a preset condition, some of the shutdown apparatuses are turned off or all the shutdown apparatuses are turned off, so as to lower an input voltage of the inverter. ### Claim 2 (depends on 1) The system according to claim 1, further comprising a controller, wherein the type of the shutdown apparatus comprises the shutdown device and the optimizer; and the controller is configured to adjust an output voltage of the optimizer when the input voltage of the inverter is greater than a second preset voltage and less than the first preset voltage, so as to lower the input voltage of the inverter; and the second preset voltage is less than the first preset voltage. ### Claim 3 (depends on 2) The system according to claim 2, wherein the controller is specifically configured to first turn off the shutdown device when the parameter of the inverter meets the preset condition, so as to lower the input voltage of the inverter. ### Claim 4 (depends on 2) The system according to claim 2, wherein the shutdown device comprises a first switching transistor and a first diode; a first end of the first switching transistor is connected to a positive electrode of the PV module, and a second end of the first switching transistor is connected to a positive output end of the shutdown device; a cathode of the first diode is connected to the positive output end of the shutdown device, and an anode of the first diode is connected to a negative output end of the shutdown device; when the shutdown device is turned off, the first switching transistor is turned off; and when the shutdown device is turned on, the first switching transistor is turned on. ### Claim 5 (depends on 2) The system according to claim 2, wherein the shutdown device comprises a first switching transistor and a second switching transistor; a first end of the first switching transistor is connected to a positive electrode of the PV module, and a second end of the first switching transistor is connected to a positive output end of the shutdown device; a first end of the second switching transistor is connected to the positive output end of the shutdown device, and a second end of the second switching transistor is connected to a negative output end of the shutdown device; the second switching transistor comprises an anti-parallel diode; when the shutdown device is turned off, the first switching transistor is turned off, and the second switching transistor is turned on; and when the shutdown device is turned on, the first switching transistor is turned on, and the second switching transistor is turned off. ### Claim 6 A photovoltaic (PV) power generation system, comprising an inverter and at least one shutdown apparatus, wherein a type of the shutdown apparatus is at least one of a shutdown device or an optimizer; an input end of each shutdown apparatus is used to connect to a corresponding PV module, and power of the corresponding PV module is output; output ends of all PV modules are connected to corresponding shutdown apparatuses, and output ends of all the shutdown apparatuses are connected in series to an input end of the inverter; or the PV module comprises a first part of PV modules and a second part of PV modules, an output end of each PV module in the first part of PV modules is connected to an input end of a corresponding shutdown apparatus, and output ends of all the shutdown apparatuses are connected in series to form a first output end; the second part of PV modules comprises at least one PV module, and when the second part of PV modules comprises a plurality of PV modules, all PV modules in the second part of PV modules are directly connected in series to form a second output end; and the first output end and the second output end are connected in series to an input end of the inverter; and the shutdown apparatus is configured to be turned off when a parameter of the shutdown apparatus meets a preset condition, wherein the preset condition is that a voltage of the shutdown apparatus is greater than a preset threshold voltage or a current of the shutdown apparatus is less than a preset threshold current, so as to lower an input voltage of the inverter. ### Claim 7 (depends on 6) The system according to claim 6, wherein the type of the shutdown apparatus comprises a shutdown device and an optimizer; and the voltage of the shutdown apparatus is an input voltage or an output voltage of the shutdown apparatus, and the current of the shutdown apparatus is an input current or an output current of the shutdown apparatus. ### Claim 8 (depends on 7) The system according to claim 7, wherein the preset threshold voltage corresponding to the optimizer is a preset optimizer threshold voltage; the optimizer is configured to adjust an output voltage of the optimizer when an input voltage or an output voltage of the optimizer is greater than the preset optimizer threshold voltage; and preset optimizer threshold voltages corresponding to at least two optimizers are different in magnitude. ### Claim 9 (depends on 7) The system according to claim 7, wherein the preset threshold voltage corresponding to the shutdown device is a preset shutdown threshold voltage; the shutdown device is specifically configured to be turned off when an input voltage or an output voltage of the shutdown device is greater than the preset shutdown threshold voltage; and preset shutdown threshold voltages corresponding to at least two shutdown devices are different in magnitude. ### Claim 10 (depends on 7) The system according to claim 7, wherein the shutdown device is further configured to be turned off when an output current of the shutdown device is less than a first preset shutdown threshold current, and is further configured to be turned on when an output current of the shutdown device is greater than a second preset shutdown threshold current; and first preset shutdown threshold currents corresponding to at least two shutdown devices are different in magnitude, second preset shutdown threshold currents corresponding to at least two shutdown devices are different in magnitude, and the first preset shutdown threshold current is less than the second preset shutdown threshold current. ### Claim 11 (depends on 6) The system according to claim 6, wherein the shutdown device comprises a first switching transistor and a first diode; a first end of the first switching transistor is connected to a positive electrode of the PV module, and a second end of the first switching transistor is connected to a positive output end of the shutdown device; a cathode of the first diode is connected to the positive output end of the shutdown device, and an anode of the first diode is connected to a negative output end of the shutdown device; when the shutdown device is turned off, the first switching transistor is turned off; and when the shutdown device is turned on, the first switching transistor is turned on. ### Claim 12 (depends on 6) The system according to claim 6, wherein the shutdown device comprises a first switching transistor and a second switching transistor; a first end of the first switching transistor is connected to a positive electrode of the PV module, and a second end of the first switching transistor is connected to a positive output end of the shutdown device; a first end of the second switching transistor is connected to the positive output end of the shutdown device, and a second end of the second switching transistor is connected to a negative output end of the shutdown device; the second switching transistor comprises an anti-parallel diode; when the shutdown device is turned off, the first switching transistor is turned off, and the second switching transistor is turned on; and when the shutdown device is turned on, the first switching transistor is turned on, and the second switching transistor is turned off. ### Claim 13 A photovoltaic power generation control method, comprising: when a parameter of an inverter of a photovoltaic (PV) power generation system meets a preset condition, turning off a shutdown apparatus of the PV power generation system so as to lower an input voltage of the inverter, wherein a type of the shutdown apparatus is at least one of a shutdown device or an optimizer; an input end of each shutdown apparatus is used to connect to a corresponding PV module, and power of the corresponding PV module is output, wherein output ends of all PV modules are connected to corresponding shutdown apparatuses, and output ends of all the shutdown apparatuses are connected in series to an input end of the inverter; and the preset condition is that the input voltage of the inverter is greater than a first preset voltage or an input current of the inverter is less than a first preset current; or when a parameter of the inverter meets a preset condition, turning off a subset of the shutdown apparatuses or all of the shutdown apparatuses, so as to lower an input voltage of the inverter, wherein the PV module comprises a first part of PV modules and a second part of PV modules, an output end of each PV module in the first part of PV modules is connected to an input end of a corresponding shutdown apparatus, and output ends of all the shutdown apparatuses are connected in series to form a first output end; the second part of PV modules comprises at least one PV module, and when the second part of PV modules comprises a plurality of PV modules, all PV modules in the second part of PV modules are directly connected in series to form a second output end; the first output end and the second output end are connected in series to an input end of the inverter. ### Claim 14 (depends on 13) The method according to claim 13, further comprising: adjusting an output voltage of the optimizer when the input voltage of the inverter is greater than a second preset voltage and less than the first preset voltage, so as to lower the input voltage of the inverter; and the second preset voltage is less than the first preset voltage. ### Claim 15 A photovoltaic power generation control method, comprising: turning off a shutdown apparatus of a photovoltaic (PV) power generation system when a parameter of the shutdown apparatus meets a preset condition, wherein the preset condition is that when a voltage of the shutdown apparatus is greater than a preset threshold voltage or a current of the shutdown apparatus is less than a preset threshold current, the shutdown apparatus is turned off, so as to lower an input voltage of an inverter of the PV power generation system, wherein a type of the shutdown apparatus is at least one of a shutdown device or an optimizer; an input end of each shutdown apparatus is used to connect to a corresponding PV module, and power of the corresponding PV module is output; wherein output ends of all PV modules are connected to corresponding shutdown apparatuses, and output ends of all the shutdown apparatuses are connected in series to an input end of the inverter; or the PV module comprises a first part of PV modules and a second part of PV modules, an output end of each PV module in the first part of PV modules is connected to an input end of a corresponding shutdown apparatus, and output ends of all the shutdown apparatuses are connected in series to form a first output end; the second part of PV modules comprises at least one PV module, and when the second part of PV modules comprises a plurality of PV modules, all PV modules in the second part of PV modules are directly connected in series to form a second output end; and the first output end and the second output end are connected in series to an input end of the inverter.