DISCRETE DOMAIN CURRENT CONTROL STRATEGY OF LCL GRID-CONNECTED INVERTER

Li Yuan; Yang Shuying; Zhang Xing

doi:10.19912/j.0254-0096.tynxb.2024-0420

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (7) : 247-258. DOI: 10.19912/j.0254-0096.tynxb.2024-0420

Special Topics of Academic Papers at the 51th Annual Meeting of the China Association for Science and Technology

DISCRETE DOMAIN CURRENT CONTROL STRATEGY OF LCL GRID-CONNECTED INVERTER

Li Yuan, Yang Shuying, Zhang Xing

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Abstract

The grid-connecteds inverter usually adopt digital control. However, the control delays and discretizatione errors will seriously affect the control performance, resulting in slow dynamic response, active damping failure, and grid voltage background harmonics. In view of the above problems, this paper proposes a discrete domain state space fusion capacitor voltage feedforward controller, which effectively reduces the influence of grid voltage background harmonics while improving the dynamic response of the system. At the same time, the analytical expression of the controller is derived, so that the control algorithm can be automatically tuned according to the physical parameters. Finally, the dynamic performance, background harmonic suppression ability and stability of the discrete domain current controller designed in this paper are verified by experiments.

Key words

LCL grid-connected inverter / current control / active damping / background harmonics / discrete domain control

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Li Yuan, Yang Shuying, Zhang Xing. DISCRETE DOMAIN CURRENT CONTROL STRATEGY OF LCL GRID-CONNECTED INVERTER[J]. Acta Energiae Solaris Sinica. 2025, 46(7): 247-258 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0420

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