RESEARCH ON A CONTROL STRATEGY OF HIGH-PERFORMANCE GRID-CONNECTED INVERTERS

Zhang Tao; Su Jianhui; Yang Xiangzhen

doi:10.19912/j.0254-0096.tynxb.2023-1450

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (1) : 449-459. DOI: 10.19912/j.0254-0096.tynxb.2023-1450

RESEARCH ON A CONTROL STRATEGY OF HIGH-PERFORMANCE GRID-CONNECTED INVERTERS

Zhang Tao^1,2, Su Jianhui^1,2, Yang Xiangzhen^1,2

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Abstract

Some problems such as a steady state error in the control system, low quality current in grid side under non ideal grid voltage with background harmonics. In order to solve those problems, a control strategy of high-performance grid-connected inverter is pointed out in this paper. Firstly, the inverse Park Transformation （IPT） method is used to construct the orthogonal component of the grid-side current, and then the grid-side current control loop is established under the dq rotating coordinate system, and then a PI controller is used to achieve seamless tracking of the current. In order to solve the harmonic problem of grid current, a multi-resonance controller is introduced to suppress the low-order harmonics of grid-connected current. The mathematical model of the grid-connected inverter control system is derived under the stationary coordinate system, and a simplified design method for the parameters of the PI controller and multi-resonance controller in the control system is proposed. The robustness of the proposed control system is analyzed. Finally, for the 6 kW single-phase LCL grid-connected inverter control system, the correctness and effectiveness of the proposed control strategy are verified through simulation and experiments.

Key words

grid-connected inverters / orthogonal component construction / multi-resonant controller / parameter design / capacitor current feedback

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Zhang Tao, Su Jianhui, Yang Xiangzhen. RESEARCH ON A CONTROL STRATEGY OF HIGH-PERFORMANCE GRID-CONNECTED INVERTERS[J]. Acta Energiae Solaris Sinica. 2025, 46(1): 449-459 https://doi.org/10.19912/j.0254-0096.tynxb.2023-1450

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