Method and apparatus for obtaining location information of controller

#This application relates to the field of solar energy, and in particular, to a method and apparatus for obtaining location information of a controller.

#Solar energy is becoming increasingly popular by virtue of no pollution, zero emission, and the like. A solar photovoltaic power generation system (which is also referred to as a photovoltaic system) includes an inverter and a photovoltaic module. Because a voltage of photovoltaic modules that are connected in series is quite high, when a dangerous situation such as a fire occurs, the voltage of a photovoltaic string obtained after the photovoltaic modules are connected in series needs to be reduced, to ensure personal safety. In this case, a controller (which is an optimizer or a shutdown device) configured to control a photovoltaic module is generated for the solar photovoltaic power generation system. A function of the controller is to perform DC-DC conversion on a direct current output by the photovoltaic module, to output a direct current whose voltage and current are adjustable. In this way, a maximum power point of the photovoltaic module can be tracked.

#The solar photovoltaic power generation system includes a high-voltage direct current string and the inverter. The high-voltage direct current string includes a plurality of photovoltaic units, and one photovoltaic unit includes the photovoltaic module and the controller. In the solar photovoltaic power generation system, information is transmitted between the inverter and the controller through power-line communication (PLC). The inverter is a PLC central coordinator, and the controller is a PLC station. The inverter and the controller perform information interactions such as service query and command control through the PLC. After the high-voltage direct current string and the inverter are installed and deployed, sequence number code of controllers under a same high-voltage direct current string and location information of the photovoltaic unit on which the controller is located need to be correspondingly stored for ease of management. An absolute physical location of the photovoltaic unit may be obtained based on the location information and a detailed engineering design.

#FIG. 1 is a schematic structural diagram of a solar photovoltaic power generation system;

#FIG. 2 is a flowchart of an embodiment of a method for obtaining location information of a controller according to this application;

#FIG. 3 is a schematic diagram of a signal feature according to this application;

#In embodiments of this application, a word such as “example” or “for example” is used to give an example, an illustration, or descriptions. Any embodiment or scheme described as “example” or “for example” in the embodiments of this application should not be explained as being more preferred or having more advantages than another embodiment or scheme. Exactly, use of the word such as “example” or “for example” is intended to present a related concept in a specific manner.

#In description of this application, it should be noted that terms “first” and “second” are merely intended for a purpose of description, and shall not be understood as an indication or implication of relative importance. “At least one” means one or more, and “a plurality of” means two or more.

#First, the following describes some terms in the embodiments of this application, to facilitate understanding of a person skilled in the art.