| 摘要 |
A photovoltaic plant comprises one or more strings (2, 2', 2",...) of photovoltaic modules (3, 3', 3",...) connected in series, at least one inverter (5, 5', 5") electrically connected to each string (2, 2', 2",...) for injecting the electrical energy produced by the same into the net (R), a central control unit (7) for controlling and varying the energy produced by each single string (2, 2', 2",...), one or more electronic connection units (6, 6', 6",...) interposed between the strings (2, 2', 2",...) and the central control unit (7) for transmitting control signals of each single string (2, 2', 2",...), a local control unit (8, 8', 8",...) associated with each single string (2, 2', 2",...) and connected to a the inverter (5, 5', 5") to control the electric parameters of the energy injected into the net (R) and connected with one of electronic connection unit (6, 6', 6",...) for drawing the maximum instantaneous electric power (MPPT) from each single string (2, 2', 2",...) and for transmitting and/or receiving control data of each single string (2, 2', 2",...) from the central control unit (7). Each of said control local unit (8, 8', 8",...) associated to each single string (2, 2', 2",...) is adapted to process electric signals with minimum and maximum values different from those generated by the other strings in such a manner to increase the flexibility of the plant. |
