Differential power conditioning system for improving performance of photovoltaic power generation system

摘要

The present invention converts direct current power generated by two or more photovoltaic modules used in photovoltaic power generation into alternating current power to instantly cast a shadow on some photovoltaic modules in a photovoltaic power generation system used for home and industrial purposes. It relates to a differential power converter for improving the problem that when a failure or performance deterioration occurs, the effect (a decrease in the output of solar power generation) is extended to the entire system, not just the corresponding solar module. To this end, the present invention provides a power control method of a power control device for controlling the power of a plurality of power conversion modules (DPP) connected in parallel to a plurality of photovoltaic modules (PV) connected in series, each of the solar modules Measuring voltage and current values for , respectively calculating converted power values of a plurality of power conversion modules, and string voltage using each of the converted power values calculated in response to the plurality of power conversion modules It provides a power control method comprising the step of controlling the plurality of power conversion modules to follow the value. Therefore, according to the present invention, it is possible to construct a solar power generation system more economically.