Management of a system of power photovoltaic by a power conditioning unit (pcu) calculating the maximum power point (mppc)

摘要

The present invention relates to a packaging unit of power (1) which controls a power system comprised of n identical solar panels (2), a battery (3) and a network of use (4). This unit is shown in the modular fig1 is composed of 2 types of regulators of power: a shunt non-dissipating (5) formed of n shunts, a panel, a battery charger - unloading of a bidirectional (6), that is - to - say a regulator capable, at the time of charging or discharging of a battery and a calculation module (7). This module is capable of calculating the maximum power point of the solar panels, called the mpp, by means of information of current and voltage, and generating a reference voltage, the image of the mpp, and to transmit it to the power regulators (8) so that they regulate the voltage vmpp (9) which is distributed to the network of use. The calculation of the mpp by the module mppc -] (7) is the result of a process, solving a system of equations to 3 are 3. This calculation is rapid, a few microseconds, accurate, and the maximum voltage does not vary if the conditions of illumination do not change. It enables a constant monitoring of the evolution of the conditions of exposure to sun. This calculation requires knowledge of 3 parameters. One of them, the current of the short - circuit of a panel is immediate: it is the current delivered by the panel which is by-passed by a shunt, here the module 1 (10). The knowledge of the 2 other parameters requires the measurement of the coordinates, the current and voltage, of a point m of the electrical characteristic of a panel, in nominal operation and 2 points in a forced (very high power, which involves the unloading of the battery.).