Power Feedforward Method for Passivity-based Gridconnected PV Inverter in Weak Grids

Li, Guihua; Wang, Wenxiu; Wang, Wei; Zhu, Kai

doi:10.1109/spec.2018.8635973

2018 IEEE 4th Southern Power Electronics Conference (SPEC) 2018

DOI: 10.1109/spec.2018.8635973

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Power Feedforward Method for Passivity-based Gridconnected PV Inverter in Weak Grids

Guihua Li

Wenxiu Wang

Wei Wang

et al.

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Cited by 2 publications

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An Improved Three-Stages Cascading Passivity-Based Control of Grid-Connected LCL Converter in Unbalanced Weak Grid Condition

Zhao

Ren

et al. 2021

IEEE Access

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This paper proposes an improved three-stages cascading passivity-based control (PBC) for a grid -connected LCL converter in unbalanced weak grid condition. In general, the traditional double-loop control based on positive and negative sequence transformations is used in grid-connected converter control in unbalanced weak grid condition. However, it is time consuming for second harmonic filtering, and positive and negative sequence currents need to be controlled separately. The PBC has strong robustness to interference, and the line voltage based PBC can deal with the voltage unbalance effectively and easily without negative sequence transformation. But the traditional PBC needs six variables and three damping coefficients for the grid-connected LCL converter in unbalanced grid condition, and it has the disadvantage of difficult implementation. The improved PBC can realize the same control effect with three-stages cascading PBCs of two variables and one damping coefficient, and it has the advantages of easy implementation, good performance and high stability. First, the modeling and controller design are detailed described. Then the SIMULINK simulation results demonstrate the benefits of the improved control strategy. Finally, a grid-connected LCL converter prototype of 5kW is built and the experimental results verify the correctness and effectivity of the improved three-stages PBC strategy.INDEX TERMS improved passivity-based control, LCL converter, unbalanced weak grid.

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An Improved Three-Stages Cascading Passivity-Based Control of Grid-Connected LCL Converter in Unbalanced Weak Grid Condition

Zhao

Ren

et al. 2021

IEEE Access

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Passivity-Based Control of Dual Active Bridge Converter in Constant Power Load Condition

Zhao

et al. 2022

Energies

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This paper presents a passivity-based control (PBC) based on the Euler–Lagrange (EL) model for dual active bridge (DAB) converters in the constant power load (CPL) condition. The EL model, which is derived from Kirchhoff’s current equations at the input and output nodes, is first presented in the DAB application, and the bidirectional CPL is considered in the theoretical analysis, simulation, and physical verification. The PBC has strong robustness to large-signal disturbance and negative incremental resistance load, and it is suitable for DAB converters in the CPL condition. In this paper, the DAB’s EL model, passivity analysis, stability analysis, and controller design are described in detail. The simulation results based on SIMULINK are also given in this paper. Finally, a DAB converter prototype is built to demonstrate the validity and feasibility of the proposed approach.

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Power Feedforward Method for Passivity-based Gridconnected PV Inverter in Weak Grids

Cited by 2 publications

References 14 publications

An Improved Three-Stages Cascading Passivity-Based Control of Grid-Connected LCL Converter in Unbalanced Weak Grid Condition

An Improved Three-Stages Cascading Passivity-Based Control of Grid-Connected LCL Converter in Unbalanced Weak Grid Condition

Passivity-Based Control of Dual Active Bridge Converter in Constant Power Load Condition

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