Compound Control Technology of Grid-Connected Inverter System

Shuxi LIU; Qiang WANG

doi:10.16513/j.cnki.10-1427/tk.2018.06.003

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Distributed Energy ›› 2018, Vol. 3 ›› Issue (6) : 20-24. DOI: 10.16513/j.cnki.10-1427/tk.2018.06.003

Operation Analysis and Control of Active Distribution Network

Compound Control Technology of Grid-Connected Inverter System

Shuxi LIU ¹^,² ,
Qiang WANG ¹^,²

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Abstract

The LCL grid-connected inverters have become an important topology structure for eliminating high-order harmonics, and become a research hotspot for scholars at home and abroad. When the topology and modulation strategy are determined, the decoupling control of the system becomes the decisive factor for the stability and performance of the system. This paper discusses the limitations of traditional single control strategy in LCL grid-connected inverters, the advantages of compound control strategy and the advantages and disadvantages of different combinations of two kinds of compound control. The internal control mechanism of parallel compound control proportion-integral (PI) ＋ repeat-control (RC) is analyzed, and the influence of coupling degree on the system is reduced by adjusting the parameters of PI control.

Key words

LCL filter / inverter / compound control / RC control / PI control

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Shuxi LIU , Qiang WANG. Compound Control Technology of Grid-Connected Inverter System[J]. Distributed Energy Resources. 2018, 3(6): 20-24 https://doi.org/10.16513/j.cnki.10-1427/tk.2018.06.003

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