Abstract: A photovoltaic inverter and a control method thereof, and a photovoltaic system. The photovoltaic inverter system includes a voltage conversion circuit, an inverter circuit, and a controller. The controller is configured to increase, based on an output power of the inverter circuit in a current time period and an output power of the inverter circuit in a first time period, an output power of the inverter circuit when the voltage conversion circuit does not work in a maximum power state. An increase of the output power of the inverter circuit is an estimated power increment value of the inverter circuit so as to stably increase an output power of the inverter while ensuring stable operation of the inverter and safe use of a power component, and improve power supply efficiency of the photovoltaic system.

Abstract: A photovoltaic system includes at least one DC/DC converter and the inverter. An input terminal of the at least one DC/DC converter is configured to connect to a photovoltaic module, an output terminal is configured to connect to an input terminal of the inverter by using a direct current bus, and an output terminal of the inverter is connected to an alternating current grid. When the inverter is switched from a non-power-limited working state to a power-limited working state, the inverter adjusts a bus voltage of the inverter to rise from a first voltage to a second voltage. After running in the power-limited working state for a time interval, the inverter adjusts the bus voltage to drop from the second voltage to a third voltage, where the third voltage is less than or equal to the first voltage.

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: The system includes a plurality of first converters, a second converter, an inverter, and a controller. The controller obtains a sum of input voltages of the plurality of first converters connected in series to each other; when the sum of the input voltages of the plurality of first converters is greater than a first voltage, adjusts the output voltage of the first converter, so that the sum of the input voltages of the first converters is less than or equal to the first voltage; and when the sum of the input voltages of the first converters is less than a second voltage, adjusts an output voltage of the second converter, so that the output voltage of the second converter is greater than or equal to the second voltage, and the first converters keep in a state of adjusting the input voltages based on power.

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 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: This application provides a power converter box used in a photovoltaic system. The power converter box includes at least two power converters, and the at least two power converters include one primary power converter and at least one secondary power converter. The primary power converter obtains status information of a photovoltaic substring corresponding to a secondary power converter, and sends, to an inverter by using a PLC communication module in the primary power converter, the status information of the photovoltaic substring corresponding to the secondary power converter and status information of a photovoltaic substring corresponding to the primary power converter. The primary power converter further receives, by using the PLC communication module in the primary power converter, control information sent by the inverter, controls, based on the control information, an output power of the photovoltaic substring corresponding to the primary power converter.

Abstract: A photovoltaic system includes an inverter, a controller, and at least two converters. An input terminal of each of the at least two converters are connected to a corresponding photovoltaic module, and output terminals of the at least two converters are connected in series and connected to an input terminal of the inverter. The controller is configured to set a voltage limiting value of at least one of the at least two converters, so that an output voltage of the at least one converter is less than or equal to the voltage limiting value when the converter works in a voltage limiting mode. The voltage limiting value of the at least one converter is proportional to an open circuit voltage of the photovoltaic module connected to an input terminal of the converter. Open circuit voltages of different photovoltaic modules vary with different parameters or models of the photovoltaic modules.

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: 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: This application relates to a method for controlling a busbar voltage of a photovoltaic system. The photovoltaic system includes a DC/DC converter and a DC/AC converter. The DC/DC converter, the DC/AC converter, and an energy storage battery are connected via a busbar. The DC/DC converter is connected to a photovoltaic direct current source and performs maximum power point tracking on an input power from the photovoltaic direct current source. A load connected to the DC/AC converter has a load power. The energy storage battery has a maximum charging power and a maximum discharging power. The method includes: controlling the busbar voltage to be in a plurality of different discontinuous voltage intervals based on different results of comparison between a maximum photovoltaic power and the load power, the maximum charging power, and the maximum discharging power. The plurality of different discontinuous voltage intervals correspond to different operating states of the inverter.

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.

Abstract: A photovoltaic system includes at least one DC/DC converter and the inverter. An input terminal of the at least one DC/DC converter is configured to connect to a photovoltaic module, an output terminal is configured to connect to an input terminal of the inverter by using a direct current bus, and an output terminal of the inverter is connected to an alternating current grid. When the inverter is switched from a non-power-limited working state to a power-limited working state, the inverter adjusts a bus voltage of the inverter to rise from a first voltage to a second voltage. After running in the power-limited working state for a time interval, the inverter adjusts the bus voltage to drop from the second voltage to a third voltage, where the third voltage is less than or equal to the first voltage.

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.

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: A power converter analog chip includes a sampling circuit configured to collect electrical parameters of the power converter; a maximum power point tracking circuit configured to perform maximum power point tracking based on the input power or the output power obtained by the electrical parameters, and to obtain an adjustment signal; a rapid shutdown circuit configured to, when receiving a rapid shutdown instruction sent from the outside of the analog chip, generate a rapid shutdown signal; a protection circuit, configured to, when an electrical parameter of the power converter exceeds a first preset threshold, generate a protection signal and send the protection signal to the multiplexer; and a multiplexer configured to select one of the rapid shutdown signal, the protection signal, or the adjustment signal as a control signal, to control a power component in the power converter.

Abstract: A photovoltaic system, an inverter, and a direct current electric arc detection method. The system includes an inverter, a controller, and at least two converters. When detecting an electric arc, the controller controls an input current of the inverter to decrease to extinguish the arc. After the arc is extinguished, the controller controls an output voltage of at least one photovoltaic string to decrease to a first preset voltage, where the first preset voltage is less than an input voltage of the inverter when the electric arc is detected, or controls a maximum value of an output current of the at least one photovoltaic string to be a second preset current, where the second preset current is less than the input current of the inverter when the electric arc is detected. In the foregoing two recovery manners, no electric arc recurs.

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: A photovoltaic system includes an inverter, a controller, and at least two converters. An input terminal of each of the at least two converters are connected to a corresponding photovoltaic module, and output terminals of the at least two converters are connected in series and connected to an input terminal of the inverter. The controller is configured to set a voltage limiting value of at least one of the at least two converters, so that an output voltage of the at least one converter is less than or equal to the voltage limiting value when the converter works in a voltage limiting mode. The voltage limiting value of the at least one converter is proportional to an open circuit voltage of the photovoltaic module connected to an input terminal of the converter. Open circuit voltages of different photovoltaic modules vary with different parameters or models of the photovoltaic modules.

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.