Integral Sliding-Mode Control-Based Direct Power Control for Three-Level NPC Converters

Hao Lin, Jose I. Leon, Wensheng Luo, Abraham Marquez, Jianxing Liu, Sergio Vazquez and L. G. Franquelo
Additional contact information
Hao Lin: Department of Control Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Jose I. Leon: Department of Control Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Wensheng Luo: Department of Control Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Abraham Marquez: Electronic Engineering Department, Universidad de Sevilla, 41004 Sevilla, Spain
Jianxing Liu: Department of Control Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Sergio Vazquez: Electronic Engineering Department, Universidad de Sevilla, 41004 Sevilla, Spain
L. G. Franquelo: Department of Control Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

Energies, 2020, vol. 13, issue 1, 1-20

Abstract: Three-level neutral-point-clamped (NPC) converter is widely used in energy conversion systems due to its good properties for high-power systems presenting output waveforms with reduced harmonic distortion. To obtain better system performance, an integral sliding-mode control (ISMC)-based direct power control (DPC) strategy is proposed for NPC converters. The controller achieves three objectives. First, an extended state observer (ESO)-based ISMC strategy, to enforce the active and reactive power to their reference values, is applied in the power tracking loop. ESO is used to reduce the influence of parameter uncertainties. Next, in the voltage regulation loop, a radial basis function neural network (RBFNN)-based adaptive ISMC strategy is applied to regulate the DC-link voltage. RBFNN is used to estimate the load variation, which is considered as a disturbance, to improve the system disturbance rejection ability. An adaptive law is used in the controller to reduce the chattering of reference active power which can reduce the current harmonic distortion. Finally, a proportional-integral (PI) control strategy is applied in the voltage balancing loop to achieve voltage balance between two DC-link capacitors. Experimental results show the effectiveness and superiority of the proposed control strategy for the NPC power converter compared with PI-based DPC strategy.

Keywords: three-level neutral-point-clamped converter; integral sliding-mode control; extended state observer; radial basis function neural network (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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