DESIGN OF DIGITAL H&#x0221e; ROBUST CONTROLLER FOR PHOTOVOLTAIC RID-CONNECTED INVERTER IN WEAK GRID

Xie Bao; Li Pingyu; Su Jianhui; Liu Tiantian; Huang Cheng; Huang Zhaojun

doi:10.19912/j.0254-0096.tynxb.2021-0338

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Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (2) : 353-360. DOI: 10.19912/j.0254-0096.tynxb.2021-0338

DESIGN OF DIGITAL H_∞ ROBUST CONTROLLER FOR PHOTOVOLTAIC RID-CONNECTED INVERTER IN WEAK GRID

Xie Bao¹, Li Pingyu¹, Su Jianhui¹, Liu Tiantian², Huang Cheng¹, Huang Zhaojun¹

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Abstract

Due to the influence of grid impedance, the photovoltaic（PV） grid-connected inverter may be unstable under the weak grid. This paper proposes a digital H_∞ robust controller design method for PV grid-connected inverter. Firstly, this work establishes the control model of PV grid-connected inverter under the traditional control strategy, and analyzes its stability under weak grid. In order to improve the robustness of LCL-filtered PV grid-connected inverter against the variation of grid impedance, the standard H_∞ control model of PV grid-connected inverter is established in discrete domain with considering the influence of digital control delay. And the digital H_∞ controller is designed by appropriately selecting the weighting functions. Compared with the traditional dual current loop control strategy, the simulation and experimental results in this paper prove that the designed digital H_∞ controller significantly enhances the stability of PV grid-connected inverter in weak grid.

Key words

PV power / inverters / controlling time delay / weak grid / digital H_∞ controller

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Xie Bao, Li Pingyu, Su Jianhui, Liu Tiantian, Huang Cheng, Huang Zhaojun. DESIGN OF DIGITAL H_∞ ROBUST CONTROLLER FOR PHOTOVOLTAIC RID-CONNECTED INVERTER IN WEAK GRID[J]. Acta Energiae Solaris Sinica. 2023, 44(2): 353-360 https://doi.org/10.19912/j.0254-0096.tynxb.2021-0338

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