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

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 powe...

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Bibliographic Details
Published inEnergies (Basel) Vol. 13; no. 1; p. 227
Main Authors Lin, Hao, Leon, Jose I., Luo, Wensheng, Marquez, Abraham, Liu, Jianxing, Vazquez, Sergio, Franquelo, L. G.
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.01.2020
Subjects
Adaptive systems
Controllers
Disturbance
Electric potential
Energy conversion
extended state observer
Harmonic distortion
integral sliding-mode control
Load fluctuation
Mathematical models
Neural networks
Parameter uncertainty
Power converters
Radial basis function
radial basis function neural network
Reactive power
Sliding mode control
State observers
Strategy
three-level neutral-point-clamped converter
Voltage
Waveforms
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Summary: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.
ISSN:1996-1073
1996-1073
DOI:10.3390/en13010227