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THD reduction with reactive power compensation for fuzzy logic DVR based solar PV grid connected system

Frontiers in Energy 2014年第4期8卷 464-479页

作者： Akhil GUPTA Saurabh CHANANA tilak thakur Department of Electrical Engineering National institute of Technology Kumkshetra 136119 lndia Department of Electrical Engineering PEC University of Technology Chandigarh 160012 India

Dynamic voltage restorer （DVR） is used to protect sensitive loads from voltage disturbances of the distribution generation （DG） system. In this paper, a new control approach for the 200 kW solar photovoltaic grid connected system with perturb and observe maximum power point tracking （MPPT） technique is implemented. Power quality improvement with comparison is conducted during fault with proportional integral （PI） and artificial intelligence-based fuzzy logic controlled DVR. MPPT tracks the actual variable DC link voltage while deriving the maximum power from a photovoltaic array and maintains DC link voltage constant by changing modula- tion index of the converter. Simulation results during fault show that the fuzzy logic based DVR scheme demonstrates simultaneous exchange of active and reactive power with less total harmonic distortion （THD） present in voltage source converter （VSC） current and grid current with fast tracking of optimum operating point at unity power factor. Standards （IEEE-519/1547）, stipulates that the current with THD greater than 5% cannot be injected into the grid by any distributed generation source. Simulation results and validations of MPPT technique and operation of fuzzy logic controlled DVR demonstrate the effectiveness of the proposed control schemes.

关键词： fuzzy logic maximum power point tracking(MPPT) proportional integral (PI) control voltage restorer

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

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Frontiers in Energy 2014年第2期8卷 240-253页

作者： Akhil GUPTA Saurabh CHANANA tilak thakur Department of Electrical Engineering National Institute of Technology Kurukshetra 136119 India Department of Electrical Engineering PEC University of Technology Chandigarh 160012 India

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

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