NDLI: Adaptive backstepping approach for dc-side controllers of Z-source inverters in grid-tied PV system applications

Content Provider	IET Digital Library
Author	Vu, Phuong Nguyen, Quan Tran, Minh Todeschini, Grazia Santoso, Surya
Abstract	Z-source inverters (ZSIs) are single-stage power converters with both voltage buck and boost capabilities provided by the unique impedance network and the ability to operate during shoot-through states. This study proposes a novel non-linear adaptive backstepping method for dc-side controllers in a multi-loop control scheme of the ZSI in grid-tied photovoltaic (PV) systems. Despite the variability of the capacitor and inductor values in the ZSI impedance network, the proposed controller guarantees robust and stable operation under varying levels of PV irradiance and temperature. The shoot-through duty ratio of the ZSI is obtained directly from the output of an MPPT algorithm and the measured PV and inductor currents. This strategy overcomes the disadvantages of the conventional approach such as the non-minimum phase at the dc side of the ZSI. It also eliminates the need to linearise the voltage/current characteristics of the PV arrays and ZSI model. The ac-side controllers consist of an outer proportional–integral voltage controller and an inner deadbeat current controller to achieve unity power factor and stable capacitor voltage in spite of grid voltage fluctuations. The efficacy of the proposed adaptive backstepping controller and the multi-loop control scheme is validated by offline and hardware-in-the-loop real-time simulations.
Starting Page	2346
Ending Page	2354
Page Count	9
ISSN	17554535
Volume Number	11
e-ISSN	17554543
Issue Number	Issue 14, Nov (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/11/14
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2018.5763
Journal	IET Power Electronics
Publisher Date	2018-09-25
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Ac-side Controller Adaptive Backstepping Approach Adaptive Backstepping Controller Adaptive Control Closed Loop System Control Nonlinearities Control of Electric Power System Control System Synthesis Current Control Dc-side Controller Electric Current Control Grid Voltage Fluctuations Grid-tied Photovoltaic System Grid-tied PV System Application Hardware-in-the-loop Real-time Simulations Inductor Current Inductor Value Inner Deadbeat Current Controller Invertors Maximum Power Point Trackers MPPT Algorithm Multiloop Control Scheme Nonlinear Control System Nonminimum Phase Novel Nonlinear Adaptive Backstepping Method Outer Proportional–integral Voltage Controller Photovoltaic Power System PI Control Power Factor Power Generation Control Power Grid PV Array PV Irradiance Robust Control Self Adjusting Control System Shoot-through Duty Ratio Shoot-through State Single-stage Power Converter Solar Power Stations Stability in Control Theory Stable Capacitor Voltage Unique Impedance Network Unity Power Factor Voltage Buck-boost Capabilities Voltage Control Voltage-current Characteristic ZSI Impedance Network ZSI Model
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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