Pi-resonant control method of photovoltaic grid-connected inverter based on switching between continuous current mode and discontinuous current mode
A technology of discontinuous current mode and resonance control, applied in AC network to reduce harmonics/ripples, photovoltaic power generation, electrical components, etc., can solve problems such as large harmonics and low grid connection efficiency, and achieve suppression of DC components, The effect of reducing THD value and reducing influence
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[0028] The present invention will be further described below in conjunction with the accompanying drawings.
[0029] refer to Figure 1 to Figure 6 , a PI resonance control method for a photovoltaic grid-connected inverter switching between a continuous current mode and a discontinuous current mode, the control steps are as follows:
[0030] Detect photovoltaic input voltage V pv , set the reference voltage V st 30V, photovoltaic input voltage V pv with reference voltage V st For comparison, determine the photovoltaic input voltage V pv Whether it is higher than 30V, if it is higher than 30V, the controller can work normally, otherwise it will be detected in standby until the photovoltaic input voltage V pv higher than 30V.
[0031] Detect the inverter output voltage V o , and compare V o with boundary voltage V bo The size of the boundary voltage V bo It is the threshold voltage when switching between CCM mode and DCM mode. f is the switching frequency, n is the t...
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