Abstract: Embodiments of this application disclose a control method for a photovoltaic power generation system and a photovoltaic power generation system, to reduce a photovoltaic energy loss. The method includes: presetting, by the photovoltaic power generation system, an upper limit value for each converter in the photovoltaic power generation system, where the upper limit value is a maximum voltage value of an output voltage to ground of the converter, and the output voltage to ground is a voltage difference between a positive output end of the converter and a ground point of the photovoltaic power generation system; and limiting, by the photovoltaic power generation system, an output voltage to ground of a target converter based on an upper limit value corresponding to the target converter, where the target converter may be any converter in the photovoltaic power generation system.

Abstract: A power converter box and at least one junction box are integrated on a backplane of the photovoltaic module as a whole, and there is a cable for connecting the power converter and the junction box. In this case, relative to the conventional technology in which a junction box is independent of a power converter, a length of a cable used when the junction box and the power converter box are taken as a whole is shorter than a length of a cable used in the conventional technology. In this case, compared with the conventional technology in which a cable is connected to an independently placed power converter, the power converter only needs to establish a connection relationship by using a solder ribbon, a circuit board cable, and the like with low costs, so that production costs are low.

Abstract: A photovoltaic system, an optimizer, a controller, a computer program product, a computer-readable storage medium, a chip, and a method for adjusting a working state of an optimizer are provided. The photovoltaic system includes a photovoltaic panel and an optimizer. The optimizer includes a controller, a first output port, and a second output port. The controller is configured to detect an electrical signal parameter between the first output port and the second output port. The controller is configured to adjust a working state of the optimizer from a no-output state or a limited-output state to an unlimited-output state when the electrical signal parameter changes. In the photovoltaic system, the working state can be adjusted without using an unlocking apparatus, so that an implementation is simple, and costs are reduced.

Abstract: This application relates to a converter in a photovoltaic power generation system and a converter control method. An input end of the converter is connected to at least one photovoltaic module, and an output end is connected to an inverter. The control method includes: determining an output power-voltage (PV) curve of a converter based on an output PV curve of the photovoltaic module; and controlling a voltage output of the converter based on the output PV curve of the converter. The output PV curve includes at least a simulated voltage limiting section and a constant power section that are connected. In this application, an existing MPPT control policy of the inverter can be adapted when a voltage-limited output is implemented, to avoid a case in which a power of a photovoltaic string drops to zero.

Abstract: This application relates to a converter in a photovoltaic power generation system and a parametric curve scanning method for a photovoltaic string. A parametric curve includes a current-voltage curve or a power-voltage curve. The scanning method includes: controlling an output voltage of the photovoltaic string to change from a first endpoint voltage of a first voltage range to a second endpoint voltage of the first voltage range according to a first preset rule, to scan a first parametric curve; controlling the output voltage of the photovoltaic string to change from a third endpoint voltage of a second voltage range to a fourth endpoint voltage of the second voltage range according to a second preset rule, to scan a second parametric curve. There is an intersection set between the first voltage range and the second voltage range. In this application, whether a scanned curve is affected by a light change may be determined based on the first parametric curve and the second parametric curve.

Abstract: This application provides a maximum power point tracking method and a device, to improve conversion efficiency of a control device in a photovoltaic power generation system, and reduce a loss of a power generation capacity. The method includes: adjusting, by the control device, an input voltage of the control device, where the input voltage is generated by one or more of the photovoltaic module and is transmitted to the control device; determining whether a difference between a first input power and a second input power of the control device is less than or equal to a setpoint, adjusting the input voltage of the control device according to the first input power and the second input power.

Abstract: This application discloses a method, an apparatus, and a system for obtaining electronic layout applied to photovoltaic array in the field of equipment installation management. According to the method, the electronic device identifies each first area in a target picture to obtain position information and a module identifier of at least one photovoltaic module in each first area, and may directly obtain an electronic layout based on the position information and the module identifier of each photovoltaic module. In this way, a product identifier of each converter does not need to be manually obtained, and a photovoltaic module does not need to be manually added to the electronic layout. This reduces labor time consumption and improves efficiency of obtaining the electronic layout.

Abstract: A converter includes a controller and at least one switching transistor. The converter supports access of at least two photovoltaic units, the at least two photovoltaic units are connected in series inside the converter by using the switching transistor, and the photovoltaic unit is formed by at least one photovoltaic component connected in series and in parallel. The controller is configured to: when a shutdown instruction is received or a heartbeat instruction is lost within a preset time period, control the switching transistor to be disconnected, so that any two photovoltaic units connected in series are disconnected. According to the converter provided in this application, any two photovoltaic units connected in series can be disconnected when the photovoltaic power generation system is shut down. In this way, no dangerous high voltage exists in a photovoltaic array formed by the photovoltaic units, thereby improving safety of the photovoltaic power generation system.

Abstract: This application provides a maximum power point tracking method and a device, to improve conversion efficiency of a control device in a photovoltaic power generation system, and reduce a loss of a power generation capacity. The method includes: adjusting, by the control device, an input voltage of the control device, where the input voltage is generated by one or more of the photovoltaic module and is transmitted to the control device; determining whether a difference between a first input power and a second input power of the control device is less than or equal to a setpoint, adjusting the input voltage of the control device according to the first input power and the second input power.

Abstract: Embodiments of this application disclose a fault point position determining method and apparatus and a photovoltaic system, to correctly and efficiently determine a fault point position when a disconnection fault occurs in a photovoltaic system. The method is applied to a photovoltaic system, the photovoltaic system includes at least one inverter and at least one photovoltaic unit, each photovoltaic unit includes at least one photovoltaic module and one photovoltaic module controller, and the method includes: sending, by an inverter, a first test signal to the at least one photovoltaic unit; obtaining, by the inverter, first test signal characteristic information fed back by the at least one photovoltaic unit; and performing, by the inverter, absolute value or relative value sorting on the at least one piece of first test signal characteristic information, and determining a fault point in the photovoltaic system based on a sorting result.

Abstract: Embodiments of this application disclose a control method for a photovoltaic power generation system and a photovoltaic power generation system, to reduce a photovoltaic energy loss. The method includes: presetting, by the photovoltaic power generation system, an upper limit value for each converter in the photovoltaic power generation system, where the upper limit value is a maximum voltage value of an output voltage to ground of the converter, and the output voltage to ground is a voltage difference between a positive output end of the converter and a ground point of the photovoltaic power generation system; and limiting, by the photovoltaic power generation system, an output voltage to ground of a target converter based on an upper limit value corresponding to the target converter, where the target converter may be any converter in the photovoltaic power generation system.

Abstract: Embodiments relate to the field of photoelectric technologies, and provide a method for controlling photovoltaic power generation, a control device, and a photovoltaic power generation system. The method is applied to the photovoltaic power generation system. The system includes at least one photovoltaic string and a control device, the photovoltaic string includes at least one photovoltaic module, each photovoltaic module includes a photovoltaic unit and an optimizer that is connected to the photovoltaic unit, and the photovoltaic unit includes at least one photovoltaic component. The method includes: periodically sending, by the control device, an output voltage reference value update instruction to an optimizer in each photovoltaic string; and receiving, by the optimizer in each photovoltaic string, the output voltage reference value update instruction, and updating an output voltage reference value according to the output voltage reference value update instruction.