Cascade Control of Grid-Connected NPC Converters via Sliding Mode Technique

• Published in: IEEE transactions on energy conversion Vol. 38; no. 3; pp. 1491 - 1500
• Main Authors: Shen, Xiaoning, Liu, Jianxing, Lin, Hao, Yin, Yunfei, Alcaide, Abraham Marquez, Leon, Jose I.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.09.2023; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Adaptive control; Cascade control; Distributed generation; High gain; high-gain observer; Microgrids; Noise measurement; Observers; Parameter robustness; Parameter uncertainty; Robustness; Sliding mode control; three-level neutral-point-clamped converter; Transient response; Uncertain systems; Voltage control
• ISSN: 0885-8969; 1558-0059
• DOI: 10.1109/TEC.2023.3247432

This paper proposes a two-stage control strategy including an adaptive sliding mode control (ASMC) and a nonlinear high-gain observer (HGO) for the three-level neutral-point-clamped (NPC) converter in dc microgrids. In the outer loop, an ASMC is utilized to regulate the dc-link voltage. By introducing an adapted gain, the tradeoff between the chattering and dynamic performance of the classic sliding mode control is overcome, thus the transient response of the NPC converter can be further enhanced without increasing the chattering. In addition, a nonlinear HGO is cooperated with the ASMC method to reject exogenous disturbance for the NPC converter, which not only assures a high disturbance rejection capacity but also accommodates the inevitable measurement noise in the actual applications. For the inner loop, in consideration of the parameter uncertainty, a high-gain observer-based second-order sliding mode (SOSM) control is adopted to assure the steady state performance and the robustness of the NPC converter. Finally, a set of comparative experimental results confirm the effectiveness and superiority of the proposed control scheme implemented in the NPC converter. Additionally, the robustness under parameter variation of the proposed method is also validated.