Abstract: An inverter in a power generation system converts a direct current that is input from a direct-current-side device into an alternating current for power supply. The inverter includes a control apparatus and a communications apparatus. The control apparatus controls the inverter to convert the direct current that is input from the direct-current-side device into an alternating current for power supply. The communications apparatus is coupled to the control apparatus, and sends a networking information request signal used to request networking information to the direct-current-side device in the power generation system through a direct-current power line, where a frequency of the networking information request signal is within a first frequency band. The communications apparatus also receives the networking information from the direct-current-side device; and sends a control signal to the direct-current-side device, where a frequency of the control signal is within a second frequency band.

Abstract: A method, an apparatus, and a device for identifying a cell string fault in an optoelectronic system, where the method includes obtaining at least two groups of current-voltage (I-V) values of a first cell string in the optoelectronic system, performing fitting processing according to the at least two groups of I-V values using a predetermined physical string model to obtain at least one characteristic parameter of the first cell string, and comparing the at least one characteristic parameter with a pre-obtained standard characteristic parameter to determine whether the first cell string is faulty, or performing curve fitting processing on collected data using the physical string model. Therefore, identifying the cell string fault in the optoelectronic system is not affected by inconsistency of environments, and processing efficiency and accuracy of string fault identification are effectively improved.

Abstract: This application provides a photovoltaic power generation system. The system includes at least one first photovoltaic module, a photovoltaic inverter, a first two-way DC/DC converter, and at least one first energy storage unit, and further includes at least one second photovoltaic module or at least one second energy storage unit. The photovoltaic inverter includes a DC/DC converter and a DC-AC inverter, where the DC/DC converter is electrically connected to the at least one first photovoltaic module, and the DC/DC converter is connected to the DC-AC inverter through a direct current bus. For the photovoltaic power generation system, photovoltaic arrays and energy storage devices can be configured flexibly to cope with peaks and troughs of power consumption.

Abstract: A power supply system includes at least one inverter, at least one cell string, and a transformer, where an input end of the at least one inverter is connected to an output end of the at least one cell string, an output end of the at least one inverter is connected to an input end of the transformer, and an output end of the transformer is configured to output a power supply voltage. The output end of the at least one inverter is connected to an output end of an inverter unit.

Abstract: A power supply system includes at least one inverter, at least one cell string, and a transformer, where an input end of the at least one inverter is connected to an output end of the at least one cell string, an output end of the at least one inverter is connected to an input end of the transformer, and an output end of the transformer is configured to output a power supply voltage. The output end of the at least one inverter is connected to an output end of an inverter unit.

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 supply system includes at least one inverter, at least one cell string, and a transformer, where an input end of the at least one inverter is connected to an output end of the at least one cell string, an output end of the at least one inverter is connected to an input end of the transformer, and an output end of the transformer is configured to output a power supply voltage. The output end of the at least one inverter is connected to an output end of an inverter unit.

Abstract: A filter apparatus, which includes a feedback active common-mode filter and a feed-forward active common-mode filter, the feedback active common-mode filter includes a common-mode noise detection component and a first filter circuit, and the feed-forward active common-mode filter includes the common-mode noise detection component and a second filter circuit, where the first filter circuit is connected between the common-mode noise detection component and the device, and performs feedback filtering on a first common-mode noise signal, to obtain a second common-mode noise signal; the common-mode noise detection component is connected between the first filter circuit and the second filter circuit, detects the second common-mode noise signal, and provides the second filter circuit with the second common-mode noise signal; and the second filter circuit is connected between an external power source and the common-mode noise detection component, and performs feed-forward filtering on the second common-mode noise sig

Abstract: A method and an apparatus for monitoring a photovoltaic module to reduce a commissioning workload and reduce commissioning complexity, the method includes obtaining communication addresses of all module voltage monitoring apparatuses, establishing a connection to a corresponding module voltage monitoring apparatus using the communication address, obtaining a relative voltage of a corresponding module relative to a voltage reference point from the module voltage monitoring apparatus to which the connection is established; obtaining, according to relative voltages obtained from all the module voltage monitoring apparatuses, a physical location that is of a module corresponding to each module voltage monitoring apparatus and that is in the photovoltaic string; establishing an information table according to the communication address of each module voltage monitoring apparatus and the physical location of the module corresponding to each module voltage monitoring apparatus, and performing module abnormality detect

Abstract: A method, an apparatus, and a device for identifying a cell string fault in an optoelectronic system, where the method includes obtaining at least two groups of current-voltage (I-V) values of a first cell string in the optoelectronic system, performing fitting processing according to the at least two groups of I-V values using a predetermined physical string model to obtain at least one characteristic parameter of the first cell string, and comparing the at least one characteristic parameter with a pre-obtained standard characteristic parameter to determine whether the first cell string is faulty, or performing curve fitting processing on collected data using the physical string model. Therefore, identifying the cell string fault in the optoelectronic system is not affected by inconsistency of environments, and processing efficiency and accuracy of string fault identification are effectively improved.

Abstract: The present invention relates to the photoelectric field, and provides a power supply system and a power supply method, so as to reduce costs of a lead between a positive electrode or a negative electrode of a photovoltaic panel and a direct current voltage source. The power supply system includes: a photovoltaic panel string, an inverter connected to the photovoltaic panel string, and a transformer connected to the inverter. The power supply system further includes a voltage controller. The voltage controller includes a first terminal, a second terminal, and a third terminal. The voltage controller further includes: a first sampling unit, a control unit connected to the first sampling unit, and an inverter unit.

Abstract: The present application provides a low voltage ride-through control system for a multi-inverter grid-connected power converter, including: a photovoltaic array and an inverter. The inverter includes a DC/DC conversion unit and a DC/AC inversion unit connected to an output end of the DC/DC conversion unit, an input end of the DC/DC conversion unit is connected to an output end of the photovoltaic array, and the inverter is connected to a power grid at a grid-connected point. The inverter further includes a low voltage ride-through detection unit and a low voltage ride-through control unit. The low voltage ride-through detection unit is configured to determine whether to trigger low voltage ride-through. The low voltage ride-through control unit is configured to lower an input voltage of the DC/DC conversion unit when it is determined to trigger the low voltage ride-through, to lower an output voltage of the photovoltaic array.

Abstract: The present invention relates to the photoelectric field, and provides a power supply system and a power supply method, so as to reduce costs of a lead between a positive electrode or a negative electrode of a photovoltaic panel and a direct current voltage source. The power supply system includes: a photovoltaic panel string, an inverter connected to the photovoltaic panel string, and a transformer connected to the inverter. The power supply system further includes a voltage controller. The voltage controller includes a first terminal, a second terminal, and a third terminal. The voltage controller further includes: a first sampling unit, a control unit connected to the first sampling unit, and an inverter unit.

Abstract: A filter apparatus, which includes a feedback active common-mode filter and a feed-forward active common-mode filter, the feedback active common-mode filter includes a common-mode noise detection component and a first filter circuit, and the feed-forward active common-mode filter includes the common-mode noise detection component and a second filter circuit, where the first filter circuit is connected between the common-mode noise detection component and the device, and performs feedback filtering on a first common-mode noise signal, to obtain a second common-mode noise signal; the common-mode noise detection component is connected between the first filter circuit and the second filter circuit, detects the second common-mode noise signal, and provides the second filter circuit with the second common-mode noise signal; and the second filter circuit is connected between an external power source and the common-mode noise detection component, and performs feed-forward filtering on the second common-mode noise sig

Abstract: A method and an apparatus for monitoring a photovoltaic module to reduce a commissioning workload and reduce commissioning complexity, the method includes obtaining communication addresses of all module voltage monitoring apparatuses, establishing a connection to a corresponding module voltage monitoring apparatus using the communication address, obtaining a relative voltage of a corresponding module relative to a voltage reference point from the module voltage monitoring apparatus to which the connection is established; obtaining, according to relative voltages obtained from all the module voltage monitoring apparatuses, a physical location that is of a module corresponding to each module voltage monitoring apparatus and that is in the photovoltaic string; establishing an information table according to the communication address of each module voltage monitoring apparatus and the physical location of the module corresponding to each module voltage monitoring apparatus, and performing module abnormality detect

Abstract: An inverter comprises a first input capacitor and a second input capacitor connected in series, an inverting unit comprising a first switch, a second switch, a third switch and a fourth switch connected in series, wherein the inverting unit is connected to an input of an L-C filter, a first bidirectional conductive path connected between a common node of the first switch and the second switch, and a common node of the first input capacitor and the second input capacitor, a second bidirectional conductive path connected between a common node of the third switch and the fourth switch, and the common node of the first input capacitor and the second input capacitor and a flying capacitor connected between the common node of the first switch and the second switch, and the common node of the third switch and the fourth switch.

Abstract: An inverter comprises a first input capacitor and a second input capacitor connected in series, an inverting unit comprising a first switch, a second switch, a third switch and a fourth switch connected in series, wherein the inverting unit is connected to an input of an L-C filter, a first bidirectional conductive path connected between a common node of the first switch and the second switch, and a common node of the first input capacitor and the second input capacitor, a second bidirectional conductive path connected between a common node of the third switch and the fourth switch, and the common node of the first input capacitor and the second input capacitor and a flying capacitor connected between the common node of the first switch and the second switch, and the common node of the third switch and the fourth switch.