Automatic Control Method of Proportional-integral+Multiple Proportional Resonance for Grid-connected Inverter of Z-source Photovoltaic Building
The automatic control method of proportional-integral+multiple proportional resonance for grid-connected inverter of Z-source photovoltaic building is proposed to improve the ability to resist harmonic disturbance and make the control system of Z-source photovoltaic building have outstanding dynamic response ability.Based on the mathematical model of the grid-connect-ed inverter of Z-source photovoltaic building,and the basic principle of iterative proportional-integral control,the integral time multiplied by the absolute value of error criterion is regarded as the control optimization objective,and the parameters are ad-justed according to the minimum error integral condition to achieve accurate tracking of the grid-connected reference signal.The harmonic pollution generated in the grid-connected current is suppressed through multiple proportional resonance control,and the decoupling link is introduced to realize the accurate control of Z-source photovoltaic building grid-connected inverter.The experimental results show that the optimal proportional coefficient of multiple proportional resonance control is 2,resonance co-efficient is 90,cut-off angle frequency is 3,can realize the automatic control of Z-source photovoltaic building grid-connected in-verter,and the output current waveform curve is smooth after control,and harmonic interference is effectively suppressed.
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