Inverter and main controller of photovoltaic system, and photovoltaic method

A primary of a photovoltaic power generation system, comprising:

• a communication unit configured to transmit a registration start signal and a maximum waiting time to M module level power electronics (MLPEs) and receive unique information from the M MLPEs, wherein M is a natural number greater than or equal to 2;
• and
• a processor configured to set the registration start signal and the maximum waiting time and assign a sequence ID indicating an order of information transmission and reception between the M MLPEs to the unique information of the M MLPEs in an order in which the unique information is received,
• wherein the unique information of the M MLPEs is transmitted at a unique information transmission time of each MLPE, and the unique information transmission time is based on a random time set within the maximum waiting time.

An inverter of a photovoltaic power generation system, comprising

• a main controller,
• wherein the primary comprises:
• a communication unit configured to transmit a registration start signal and a maximum waiting time to one or more module level power electronics (MLPEs) and receive unique information from the one or more MLPEs;
• and
• a processor configured to set a first maximum waiting time, determine to transmit the registration start signal and the first maximum waiting time to the one or more MLPEs, assign a first sequence ID to the unique information of a first MLPE among the one or more MLPEs, set a second maximum waiting time, determine to transmit the registration start signal and the second maximum waiting time to the one or more MLPEs, and assign a second sequence ID to the unique information of a second MLPE among the one or more MLPEs.