NDLI: Optimised PI-4VPI current controller for three-phase grid-integrated photovoltaic inverter under grid voltage distortions

Content Provider	IET Digital Library
Author	Patel, Nirav Kumar, Ajay Gupta, Nitin Ray, Soumyadeep Babu, B. Chitti
Abstract	This study aims to propose optimised and robust current controller for the transformerless grid-integrated photovoltaic inverter. Challenge of ensuring improved power quality while minimising the DC-component under non-ideal grid condition is at the forefront in the photovoltaic system. In this context, an advanced current controller is designed and developed in the stationary reference frame with proportional-integral (PI) plus four-vector PI (4VPI) controllers. The PI-controller modulates the shape of fundamental current to follow its reference induced from outer DC-link loop. Meanwhile, 4VPI controllers are tuned at the multiple of grid frequencies including third-( 3 ω 0 ), fifth-( 5 ω 0 ), seventh-( 7 ω 0 ), and ninth-( 9 ω 0 ) to introduce infinite gain and thereby alleviating stationary errors in the current loop of the photovoltaic inverter. The most distinguishing feature of the proposed controller is its inherent control robustness, and therefore, it operates satisfactorily against control delay time and frequency excursion. Traditionally, cumbersome trial-and-error techniques have been largely employed to adjust the PI-VPI controller gains. Nonetheless, tuning of these parameters has made many practitioners switch-off from employing the proposed controller. Given this, the particle swarm optimisation algorithm is proposed. Finally, the practicality of the proposed controller is verified through comprehensive set of simulation and experimental tests conducted on a laboratory-developed prototype using dSPACE-1104.
Starting Page	779
Ending Page	792
Page Count	14
ISSN	17521416
Volume Number	14
e-ISSN	17521424
Issue Number	Issue 5, Apr (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-rpg/14/5
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-rpg.2019.0507
Journal	IET Renewable Power Generation
Publisher Date	2019-11-12
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Control Delay Time Control of Electric Power System Control Robustness Current Control DC-component DC-link Loop Electric Current Control Four-vector PI Controller Grid Frequency Grid Voltage Distortion Grid-integrated Photovoltaic System Harmonics Invertors Nonideal Grid Condition Optimal Control Optimisation Technique Optimised Controller Optimised PI-4VPI Current Controller Particle Swarm Optimisation Particle Swarm Optimisation Algorithm Photovoltaic Power System PI Control PI-VPI Controller Gain Power Converter Power Generation Control Power Grid Power Quality Power Supplies to Apparatus Power Supply Quality Power System Control Proportional–integral Control Robust Control Robust Current Controller Solar Power Stations Stability in Control Theory Three-phase Grid-integrated Photovoltaic Inverter Transformerless Grid-integrated Photovoltaic Inverter Voltage Control
Content Type	Text
Resource Type	Article
Subject	Renewable Energy, Sustainability and the Environment

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