solar pump inverter MPPT
Maximum Power Point Tracker (MPPT)
It can be seen from the volt ampere characteristic curve of the photovoltaic array that the position of the maximum power output point of the photovoltaic array under different solar irradiance is not fixed, and when the ambient temperature changes, The maximum power "point position corresponding to the same irradiance will also change. In order to achieve maximum power" point tracking to obtain the most energy under the current sunshine, MPPT is usually made in two forms, which are described below. · Constant voltage maximum power point tracker (CVT type MPPT).
Carefully observe the figure: the round black dots representing the maximum power output -- the position of the maximum power point in the figure. They are all located near the straight line of Umax=const, especially when the solar radiation is relatively strong, they are closer to Umax=const. At the same time, considering that Zhan Yang has the following excellent temperature dips, when the temperature rises, the open circuit voltage UOC will decrease and the short-circuit current Isc will increase slightly under the same solar radiation conditions, Considering that the ambient temperature is generally higher when the solar radiation is high, and the ambient temperature is generally lower when the solar radiation is low, combined with the temperature characteristics of solar electricity, they are just conducive to making the locus of the maximum power point in a day closer to a vertical line Umax=const, which means that in engineering, people are allowed to treat the locus of the maximum power point as a vertical line Umax=const approximately, This constitutes the theoretical basis of TcvT type MPPT.
True MPPT
C "T type MPPT has its shortcomings, mainly because the open circuit voltage Uoc and the maximum power point voltage U of the photovoltaic array are greatly affected by the temperature. Once Um is set, there will be a large deviation in winter and summer, which will be zero. The stomach will lose a considerable part of energy. Therefore, many systems have started to adopt the" real MPPT "technology under the condition that the performance/price of today's microcomputer chips) and in fact, Shengneng is constantly improving.
In the "true MPPT" technology, people adopt the concept of self optimization to measure the output power of photovoltaic array in real time, and automatically find the maximum power point after comparison. Keep searching, constantly adjusting, and constantly looking again... The system has been in the adjustment of micro J. This "real MPPT" can automatically adapt to the large temperature difference between winter and summer without manual intervention, which is very conducive to improving the annual efficiency of the system.
