MPPT (maximum power point tracking) control device and MPPT control method of photovoltaic inverter
A photovoltaic inverter and control method technology, applied in photovoltaic power generation, control/regulation systems, instruments, etc., can solve problems such as increasing the time to find MPP points, left and right oscillations of photovoltaic inverters, and reducing the efficiency of solar cells, etc., to achieve The effect of fast processing, simple MPPT control device, and stable control
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[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0027] Firstly, the energy flow in the single-phase photovoltaic inverter is analyzed. Ignoring various losses (including inverter bridge switching loss, passive device loss, line loss and secondary power supply, etc.), the power balance relationship of the system is as follows figure 1 and figure 2 As shown, the arrow indicates the positive direction of the specified power. In the figure, Ppv is the output power of the photovoltaic cell; Pc is the power of the DC bus capacitor; uDC is the DC bus voltage, that is, the output voltage of the solar panel; iC is the current on the DC bus capacitor; uL is the voltage on the AC filter inductor ; uG is the AC grid voltage; iG is the AC output current; C is the DC bus capacitance; L is the AC filter inductance. According to the power balance relationship, there are
[0028] P ...
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