Photovoltaic inverter MPPT control method based on three-point comparison method
A photovoltaic inverter and maximum power point technology, applied in photovoltaic power generation, control/regulation systems, instruments, etc., can solve problems such as false disturbance, complex structure, cumbersome steps, etc., and achieve the goal of improving output efficiency and reducing disturbance amplitude Effect
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[0014] by figure 1 The three points A, B and C are taken as examples, and the specific implementation process of the present invention is introduced in detail.
[0015] Let the voltage at A be U 0 , the current is I, and the power Pa at point A is calculated, and the upper and lower sides of point A are sampled with the same step size △U, the sampling points are B and C, and the voltage at point B is U 0 +△U, the power is Pb, the voltage at point C is U 0 -△U, the power is Pc, such as figure 2 As shown, compare Pa and Pb, if PaPb, then subtract 1 from the counter num, continue to compare Pa and Pc, if Pa>Pc, add 1 to the counter num, if Pa
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