access icon free Integrated design method for LCL-type filter and current controller to improve inverter adaptability to grid impedance

© The Institution of Engineering and Technology
Received 03/04/2019, Accepted 08/08/2019, Revised 05/07/2019, Published 09/08/2019

To characterise the grid-connected inverter with strong robustness against grid impedance, this study proposes an integrated design approach of LCL-type filter and controller parameters. In the approach, the inherent relation between LCL-type filter and controller in regarding to inverter robustness is revealed and utilised to realise the optimised match between LCL-type-filter parameters and controller parameters. To facilitate the analysis of stability and robustness, a parameter normalisation scheme is also proposed. With the scheme, relevant normalisation parameters can be designed succinctly according to the required stability and robustness. Additionally, the LCL-type parameter and controller parameter can be achieved immediately by restoring normalisation parameters. Based on the approach parameter constraints and design guidelines for robust grid-connected inverter design are also derived in the study to facilitate its application in practice. The proposed inverter design method can guarantee the inverter stability and robustness simultaneously without needing the complicated iterative computations, which cannot be avoided for conventional design methods. Simulation and experimental results are presented to validate the performance and demonstrate the merits of the integrated design method.

Inspec keywords: electric current control; filtering theory; invertors; power grids

Other keywords: strong robustness; parameter constraints; inverter adaptability; controller parameters; parameter normalisation scheme; design guidelines; current controller; integrated design approach; inverter stability; grid impedance; conventional design methods; inverter robustness; LCL-filter parameters; integrated design method; normalisation parameters; robust grid-connected inverter design; LCL filter; controller parameter; inverter design method

Subjects: Power convertors and power supplies to apparatus; Filtering methods in signal processing; Current control; Control of electric power systems; Signal processing theory

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