The sides of the energy changes are then, for a small PV system, more pronounced than for larger installations. For small plants a few kW, the PV can vary with time special situations clearly defined clouds (especially in spring and summer) and less than 500 m about 15% to 120% of rated DC nominal.
Under such conditions, a UPS or at least should not be quenched. A variant almost rectangular, with between 20% and 100% of rated current and, therefore, with steep slopes and only less (1-3) intermediate levels, which are accessed only for a short period of time (for ex. 100 ms to 200 ms) is a simple test of the dynamic behavior. As in the case of the static test, the values PMPP must, before beginning a test of dynamic MPP tracking is determined in the power levels and provides for a stabilization period of 1-2 minutes should also be indicated.
Then after a few cycles of testing takes place during the effective dynamic MPPT measurement. Naturally, most UPS does not immediately find the MPP effectively, so power is not available MPP completely absorbed after a modification. The time T during which the current value of high and low that was reached during a test cycle can vary between 2 s and 60 s, resulting in a total cycle time of 4 ssa 120 and a total test time TM = TMI in a range of power and voltage setting of a maximum of 12 minutes.
The dynamic MPPT tracking performance can be calculated similarly to that described in (1): (Sum of the different energies that MPP can be absorbed in optimal conditions at different power levels). TMI = time during which the solar array simulator offers maximum power PMPPi final tot Note The overall performance presented in this article takes more account of the behavior of static converters connected to the pure conversion efficiency. It must be stated by the manufacturers for different voltages. Thus the articles would be better specified and planners and simulation programs allow the design of photovoltaic optimal. In places where the clouds change frequently, dynamic MPPT performance is also important.
Regulatory MPP Investors are fast, in the case of a variable sun, a power exceeding slow devices regulated. In the case of two devices described here as an example, the behavior of static MPP IG 30 is greater, the PPB regulatory body, however, is slower and reduce the dynamic behavior. In the case of NT 4000, MPP static behavior is not as good due to the operation in a fixed voltage to the small powers, but the MPP regulator is already relatively fast and dynamic MPP tracking well. On the basis of measurements, the Umpp should be placed, for the NT 4000 and in general, optimum results, about 400 V and 460 V rated power, and by the IG 30, approximately 280 V and 330 V.