Photovoltaic power generation system and method

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.

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.

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.