Sliding Mode Control of Grid-Connected Neutral-Point-Clamped Converters Via High-Gain Observer

In this article, a nonlinear high-gain observer (NHGO)-based second-order sliding mode (SOSM) control strategy is proposed for the three-phase three-level neutral-point-clamped (NPC) converter. This controller applies the advanced SOSM algorithm both in the voltage regulation loop and in the power t...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2022-04, Vol.69 (4), p.4010-4021
Main Authors: Liu, Jianxing, Shen, Xiaoning, Alcaide, Abraham Marquez, Yin, Yunfei, Leon, Jose I., Vazquez, Sergio, Wu, Ligang, Franquelo, Leopoldo G.
Format: Article
Language:English
Subjects:
Algorithms
Capacitors
Clamping
Control methods
Controllers
Converters
High gain
High-gain observer (HGO)
neutral-point-clamped (NPC) converter
Noise measurement
Observers
Sliding mode control
sliding mode control (SMC)
State observers
Steady state
Tracking loops
Voltage control
Voltage measurement
Voltage regulators
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In this article, a nonlinear high-gain observer (NHGO)-based second-order sliding mode (SOSM) control strategy is proposed for the three-phase three-level neutral-point-clamped (NPC) converter. This controller applies the advanced SOSM algorithm both in the voltage regulation loop and in the power tracking loop, which provides a fast dynamic for the dc-link voltage, and also assures a good steady-state behavior for the NPC converter. Additionally, an NHGO technique is implemented in the voltage regulator combining with the SOSM algorithm. The conventional observer-based controllers suffer from the destructive effects of measurement noise, and it can only be addressed by diminishing the observer gain, which sacrifices the observer property. The NHGO technique adopts a time varying gain, that is, high gain in transient while low gain in steady state, which minimizes the adverse influence of measurement noise. The tuning method of the proposed NHGO-based SOSM controller is given to simplify the implementation process. Finally, the simulation and experimental results of the proposed control scheme for the NPC converter are given and compared with the conventional PI controller as well as the well-known linear extended state observer-based control method, which validates the feasibility and superiority of the proposed controller.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2021.3070496