Power quality investigation of a solar PV transformer-less grid-connected system fed DVR  

作　　者：Akhil GUPTA Saurabh CHANANA Tilak THAKUR 

机构地区：[1]Department of Electrical Engineering, National Institute of Technology, Kurukshetra 136119, India [2]Department of Electrical Engineering, PEC University of Technology, Chandigarh 160012, India

出　　处：《Frontiers in Energy》2014年第2期240-253,共14页能源前沿（英文版）

摘　　要：This paper presents a single stage transformerless grid-connected solar photovoltaic （PV） system with an active and reactive power control. In the absence of active input power, the grid-tied voltage source converter （VSC） is operated in a reactive power generation mode, which powers the control circuitry, and maintains a regulated DC voltage to the VSC. A data-based maximum power point tracking （MPPT） control scheme which performs power quality control at a maximum power by reducing the total harmonic distortion （THD） in grid injected current as per IEEE-519/1547 standards is implemented. A proportionalintegral （P1） controller based dynamic voltage restorer （DVR） control scheme is implemented which controls the grid side converter during single-phase to ground fault. The analysis includes the grid current THD along with the corresponding variation of the active and reactive power during the fault condition. The MPPT tracks the actual variable DC link voltage while deriving the maximum power from the solar PV array, and maintains the DC link voltage constant by changing the modulation index of the VSC. Simulation results using Matlab/Simulink are presented to demonstrate the feasibility and validations of the proposed novel MPPT and DVR control systems under different environmental conditions.This paper presents a single stage transformerless grid-connected solar photovoltaic （PV） system with an active and reactive power control. In the absence of active input power, the grid-tied voltage source converter （VSC） is operated in a reactive power generation mode, which powers the control circuitry, and maintains a regulated DC voltage to the VSC. A data-based maximum power point tracking （MPPT） control scheme which performs power quality control at a maximum power by reducing the total harmonic distortion （THD） in grid injected current as per IEEE-519/1547 standards is implemented. A proportionalintegral （P1） controller based dynamic voltage restorer （DVR） control scheme is implemented which controls the grid side converter during single-phase to ground fault. The analysis includes the grid current THD along with the corresponding variation of the active and reactive power during the fault condition. The MPPT tracks the actual variable DC link voltage while deriving the maximum power from the solar PV array, and maintains the DC link voltage constant by changing the modulation index of the VSC. Simulation results using Matlab/Simulink are presented to demonstrate the feasibility and validations of the proposed novel MPPT and DVR control systems under different environmental conditions.

关 键 词：data-based maximum power point tracking （MPPT） total harmonic distortion （THD） proportional integral control voltage restorer pulse width modulation 

分 类 号：TM407[电气工程—电器] TN949.7[电子电信—信号与信息处理]