NDLI: Improved phase-locked loop-based control for grid-integrated PV system

Content Provider	IET Digital Library
Author	Pal, Kanwar Kumar, Shailendra Singh, Bhim Kandpal, Tara C.
Abstract	This work presents an improved phase-locked loop (IPLL)-based control for grid-integrated photovoltaic (PV) system (GIPVS). It is used to extract amplitude, frequency, and phase angle of distorted load currents to control PV-grid-interfaced voltage source converter (VSC). The VSC controls active and reactive powers at unbalances and distortions in the grid voltages. The control algorithm of VSC includes power feed-forward term, DC-link voltage, and grid voltages. The feed-forward term improves the dynamic performance of a GIPVS and enhances the utilisation of VSC. Three-phase IPLLs extract the in-phase components of three-phase load currents at utility frequency. Further, these in-phase components of load currents are used for estimation of reference-grid currents. The proposed IPLL-based control algorithm offers good dynamic response even under unbalanced load condition. The efficient working of IPLL-based control algorithm is realised by extracting maximum power from PV-grid system and through its power-quality improvement. The perturb and observe (P & O) control algorithm is used for optimum utilisation of a PV array. A developed prototype of PV-grid system is used to implement an IPLL-based control algorithm under different operating conditions.
Starting Page	705
Ending Page	712
Page Count	8
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.2019.0361
Journal	IET Renewable Power Generation
Publisher Date	2019-06-17
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Active Power Control Control of Electric Power System DC-link Voltage Demodulator Discriminators And Mixers Distorted Load Currents Dynamic Response Feedforward Grid Voltage Grid-integrated Photovoltaic System Grid-integrated PV System Harmonics Improved Phase-locked Loop-based Control In-phase Component IPLL-based Control Algorithm Modulator P&O Control Algorithm Perturb And Observe Control Algorithm Phase Angle Phase Locked Loop Photovoltaic Power System PLL-based Control Algorithm Power And Energy Control Power Converter Power Feed-forward Term Power Feedforward Term Power Generation Control Power Grid Power Supplies to Apparatus Power Supply Quality Power System Control Power System Economics Power System Managemen Power System Operation Power-quality Improvement PV Array PV-grid System PV-grid-interfaced Voltage Source Converter Reactive Power Control Reference-grid Current Estimation Solar Power Stations Three-phase IPLLs Three-phase Load Current Utility Frequency Voltage-source Converter VSC
Content Type	Text
Resource Type	Article
Subject	Renewable Energy, Sustainability and the Environment

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