Method for automatically assigning addresses after plurality of photovoltaic inverters are connected in series

• Main Authors: ZHENG HONGTAO, FAN XIAOHU
• Format: Patent
• Language: English
• Published: 09.09.2015
• Subjects: CALCULATING; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; COMPUTING; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; ELECTRICITY; GENERATION; PHYSICS; SYSTEMS FOR STORING ELECTRIC ENERGY

The invention provides a method for automatically assigning addresses after a plurality of photovoltaic inverters are connected in series. The method comprises the following steps of: 1, connecting the plurality of photovoltaic inverters which are connected in series with an HMI (Human Machine Interface) monitoring system through a converter; 2, sending a re-registration instruction by the HMI monitoring system, and changing the addresses of the photovoltaic inverters into 0; 3, sending a sequence number obtaining instruction by the HMI monitoring system, and transmitting sequence numbers to the HMI monitoring in an interleaved way by the photovoltaic inverters according to the response time obtained by the sequence numbers; 4, automatically assigning the addresses for the photovoltaic inverters by the HMI monitoring system according to an address progressive increase principle in accordance with the arriving sequence of the sequence numbers; and 5, building the communication between the photovoltaic inverters and the HMI monitoring system, transmitting relevant data to the HMI monitoring system after a parameter inquiry instruction is received, and displaying the relevant data. The method provided by the invention has the advantages that manual intervention is not needed for address assignment; the assignment reliability, the assignment stability and the assignment accuracy are effectively improved; and meanwhile, the labor cost and the time cost are also reduced, so that the communication efficiency is greatly improved, and the monitoring and the maintenance on a grid-connected power generation system are realized.