Method for tracing maximum power point of photovoltaic miniature grid-connected inverter
A technology of maximum power point and inverter, which is applied in photovoltaic power generation, instruments, and regulation of electrical variables, etc., can solve problems such as large harmonics of grid-connected current and unfavorable system efficiency, so as to improve harmonics, improve system efficiency, and improve The effect of overall indicators
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[0026] Preferred embodiments of the present invention are described in detail as follows in conjunction with accompanying drawings:
[0027] The method for tracking the maximum power point of a photovoltaic micro-grid-connected inverter, the control steps are as follows:
[0028] (1) Run the continuous working mode and perform maximum power point tracking control;
[0029] (2) Sampling photovoltaic cell current i pv and voltage u pv , to calculate the photovoltaic cell power P pv = u pv *i pv ;
[0030] (3) Compare P pv and power threshold P set size, if P pv >P set , then execute step (1), otherwise execute step (4), where P set According to the rated power setting of the inverter, the general value is 30% of the rated power;
[0031] (4) Calculating the grid-connected period N under the intermittent working mode on and energy storage period N off , run the intermittent work mode;
[0032] (5) If it is currently the grid-connection cycle, execute the grid-connec...
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