Procedure for MPP control of photovoltaic solar power plant

摘要

An MPP control procedure for a photovoltaic solar power plant uses the following steps. First, the family of characteristics is stored in a microcomputer for the modules or circuits to be connected. Then to determine the instantaneous incident radiation and module temperature, control signals for the computer bring about the short-circuiting or load disconnection of the module configuration, thus enabling the short-circuit current and no-load voltage to be found. Their comparison with the stored characteristics gives the maximum power point. A D/A converter gives a control voltage to a comparator where there is a comparison with a module voltage held in a condenser and accordingly the load current is cyclically switched of and on.