NDLI: Unified control of Z-source grid-connected photovoltaic system with reactive power compensation and harmonics restraint: design and application

Content Provider	IET Digital Library
Author	Zhang, Jingwei
Abstract	Based on the Z-source inverter (ZSI), a unified control strategy of grid-connected photovoltaic (PV) system is investigated. It can both compensate the reactive power and restrain the current harmonics. At first, the principle of the proposed unified control is analysed. Then, the space vector pulse width modulation (SVPWM) is improved for inserting the shoot-through time into the modulation period. Simulation results show that the proposed unified control strategy is feasible and effective. Besides, a hardware controller is designed based on the digital signal processor (DSP). The corresponding approach for applying the improved SVPWM with the DSP and the driver circuit is illustrated in detail. Eventually, an experiment apparatus is implemented. Experiment results reveal that the proposed unified control strategy can effectively regulate active and reactive power generated by the grid-connected PV system. Besides, the fifth current harmonic of grid can be restrained effectively, the total harmonic distortion of the grid current decreases from 20.9 to 8.1%, which indicates that the restraint of the current harmonics is feasible for the proposed unified control strategy.
Starting Page	422
Ending Page	429
Page Count	8
ISSN	17521416
Volume Number	12
e-ISSN	17521424
Issue Number	Issue 4, Mar (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-rpg/12/4
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-rpg.2016.0478
Journal	IET Renewable Power Generation
Publisher Date	2017-12-15
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Active Power Regulation Control of Electric Power System Digital Signal Processing Chips Digital Signal Processor Driver Circuit DSP Hardware Controller Harmonic Distortion Harmonics Harmonics Restraint Modulation Period Photovoltaic Power System Power And Energy Control Power Electronics Power Generation Control Power Supply Power Supply Quality Power System Control Power System Harmonics PWM Invertors Reactive Power Compensation Reactive Power Control Reactive Power Regulation Shoot-through Time Solar Power Stations Space Vector Pulse Width Modulation Supervisory Circuit SVPWM Total Harmonic Distortion Unified Control Strategy Z-source Grid-connected Photovoltaic System Z-source Inverter ZSI
Content Type	Text
Resource Type	Article
Subject	Renewable Energy, Sustainability and the Environment

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