ADAPTIVE IMPROVEMENT STRATEGY FOR GRID-CONNECTED INVERTER BASED ON ACTIVE DAMPING OF PI CONTROLLERS

Zhao Tieying; Gao Ning; Yang Jie; Yang Ming; Li Junran

doi:10.19912/j.0254-0096.tynxb.2021-1574

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Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (5) : 152-161. DOI: 10.19912/j.0254-0096.tynxb.2021-1574

ADAPTIVE IMPROVEMENT STRATEGY FOR GRID-CONNECTED INVERTER BASED ON ACTIVE DAMPING OF PI CONTROLLERS

Zhao Tieying, Gao Ning, Yang Jie, Yang Ming, Li Junran

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Abstract

Under weak grid conditions, as the impedance of the grid increases, the grid voltage proportional feed-forward and phase-locked loops will lead to a significant reduction in system robustness. To this end, the impedance model of the LCL type grid-connected inverter containing the phase-locked loop and the grid-voltage proportional feed-forward is first established, and the stability analysis is performed using the impedance analysis method. An improvement strategy of active damping using PI controller is proposed to compensate the equivalent output impedance phase of the inverter, thereby expanding the system’s adaptation range to weak grids. However, the improvement strategy still has certain limitations, so on the basis of the improvement strategy, an adaptive link is added, and the added controller parameters are adaptively optimized by the particle swarm optimization algorithm combined with the grid impedance measurement technology, so as to further improve the system Robustness over a wide range of grid impedance variations. Finally, simulation experiments verify the correctness and effectiveness of the adaptive improvement strategy.

Key words

weak grid / grid-connected inverter / phase-locked loop / active damping / adaptability / particle swarm optimization

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Zhao Tieying, Gao Ning, Yang Jie, Yang Ming, Li Junran. ADAPTIVE IMPROVEMENT STRATEGY FOR GRID-CONNECTED INVERTER BASED ON ACTIVE DAMPING OF PI CONTROLLERS[J]. Acta Energiae Solaris Sinica. 2023, 44(5): 152-161 https://doi.org/10.19912/j.0254-0096.tynxb.2021-1574

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