RESEARCH ON CURRENT DIRECT FEED-FORWARD DAMPING CONTROL BASED ON DUAL LIMITATIONS FOR PV INVERTER

Qi Lei; Sun Xiaofeng; Zhao Wei; Shen Hong; Wang Baocheng

doi:10.19912/j.0254-0096.tynxb.2021-0908

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Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (1) : 33-41. DOI: 10.19912/j.0254-0096.tynxb.2021-0908

RESEARCH ON CURRENT DIRECT FEED-FORWARD DAMPING CONTROL BASED ON DUAL LIMITATIONS FOR PV INVERTER

Qi Lei, Sun Xiaofeng, Zhao Wei, Shen Hong, Wang Baocheng

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Abstract

A novel current direct feed-forward damping control strategy and the optimization on damping parameter based on dual limitations are proposed to suppress the high frequency resonance of the grid-connected system with multiple PV inverters under weak grid. Firstly, based on impedance criterion, the mathematical model of the grid-connected system with multiple PV inverters is built to predict the potential high frequency resonance. Then, the control loop of the current direct feed-forward damping with equivalent physical connection is obtained by forward moving of the inverter series with resistance. By analyzing the global harmonic suppression effect of the system and the self-stability of the inverter with different damping parameters, the value of the damping parameter is evaluated based on dual limitations of global stability and self-stability. Moreover, the control ability of proposed method with different electrical parameters under various operating status is analyzed. Finally, simulations and experiments of the grid-connected system with multiple PV inverters are built to verify the effectiveness of the front analysis.

Key words

photovoltaic generators / inverter / resonance / feedforward control / dual limitations / parameter optimization

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Qi Lei, Sun Xiaofeng, Zhao Wei, Shen Hong, Wang Baocheng. RESEARCH ON CURRENT DIRECT FEED-FORWARD DAMPING CONTROL BASED ON DUAL LIMITATIONS FOR PV INVERTER[J]. Acta Energiae Solaris Sinica. 2023, 44(1): 33-41 https://doi.org/10.19912/j.0254-0096.tynxb.2021-0908

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