Pareto-Optimal Design of LTCL-RC Filter for High-Power Grid-Connected Voltage-Source Inverter

• Published in: IECON 2023- 49th Annual Conference of the IEEE Industrial Electronics Society pp. 1 - 6
• Main Authors: Ma, Guangda, Xie, Chuan, Wang, Weijun, Zou, Jianxiao
• Format: Conference Proceeding
• Language: English
• Published: IEEE 16-10-2023
• Subjects: Damping; Density measurement; LTCL filter design; Multi-objective optimization; Pareto optimization; Pareto-optimal; passivity; Power system measurements; Power system stability; Prototypes; Switches
• ISSN: 2577-1647
• DOI: 10.1109/IECON51785.2023.10312674

In high-power applications, output filters are essential components of grid-connected inverters (GCIs) for filtering switching ripples. These filters are closely related to the electrical indexes and control performance of the GCI, including power density, efficiency, stability, etc. Therefore, they are often co-designed with constraints on electrical indexes and damping coefficients. However, damping coefficients can not provide sufficient stability conditions. To overcome it, this paper proposes a passivity-based multi-objective LTCL-RC filter design method. The proposed method can achieve passive output admittance at the full-frequency range to maintain a sufficient stability condition. To be specific, the Pareto optimization with respect to power density, efficiency and passivity is introduced to select parameters. Furthermore, a 4MW-GCI filter design example is provided to highlight its superiority over other state-of-the-art design methods, and the effectiveness of the proposed filter design approach in ensuring system stability is also verified on a scaled-down 1.4kW-VSI experimental prototype.