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

doi:10.1007/s11708-014-0307-9

Front. Energy

2014, Vol. 8

Issue (4) : 464-479 https://doi.org/10.1007/s11708-014-0307-9

RESEARCH ARTICLE

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

Akhil GUPTA¹(

), Saurabh CHANANA¹, Tilak THAKUR²

¹. Department of Electrical Engineering, National Institute of Technology, Kurukshetra 136119, India
². Department of Electrical Engineering, PEC University of Technology, Chandigarh 160012, India

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Abstract

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 modulation 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.

Keywords fuzzy logic maximum power point tracking (MPPT) proportional integral (PI) control voltage restorer

Corresponding Author(s): Akhil GUPTA

Online First Date: 04 July 2014 Issue Date: 09 January 2015

Cite this article:

Akhil GUPTA,Saurabh CHANANA,Tilak THAKUR. THD reduction with reactive power compensation for fuzzy logic DVR based solar PV grid connected system[J]. Front. Energy, 2014, 8(4): 464-479.

URL:

https://academic.hep.com.cn/fie/EN/10.1007/s11708-014-0307-9
https://academic.hep.com.cn/fie/EN/Y2014/V8/I4/464

Fig.1 Simulation model of the solar PV array connected to the grid through three-phase inverter

Fig.2 P-V and V-I curves obtained from simulations by using one of the two 100?kW solar PV arrays

Fig.3 Ramp up-down solar radiation intensity used, for 100?kW Sunpower SPR-305-WHT solar PV model under variable environmental conditions

Tab.1 Specifications adopted for one solar PV array (SunPower SPR-305-WHT)

Tab.2 Specifications adopted for transformer and utility grid

Tab.3 Specifications adopted for controller to average based VSC, CL, and connected load

Fig.4 General scheme of a 200?kW solar PV energy conversion system connected to utility grid distribution system

Fig.5 Flowchart of VSC control with feed-forward current controller

Fig.6 Block diagram of PI and fuzzy logic controlled dynamic voltage restorer

Fig.7 Block diagram of FLC

Fig.8 Membership function of error, change of error and output pulse to PWM (defuzzified value)

(a) Error E; (b) change of error dE; (c) output pulse to PWM (defuzzified value)

Tab.4 THD analysis of VSC current, load current and grid current (with DC current component)

Fig.9 Without DVR control from 3-Ф VSC, connected load and grid with P&O MPPT control during fault

Fig.10 Without DVR control uncompensated 3-Ф discrete output voltage from VSC and 3-Фgrid voltage with P&O MPPT control during fault

Fig.11 Without DVR control uncompensated 3-Ф discrete output current from VSC and 3-Ø current injected into grid with P&O MPPT control during fault

Fig.12 Active power output waveforms from 3-Ф VSC, connected load and grid for

Fig.13 Reactive power output waveforms from 3-Ф VSC, connected load and grid for

Fig.14 Compensated waveforms using fuzzy logic controlled DVR during fault

Fig.15 Compensated waveforms using fuzzy logic controlled DVR during fault

Fig.16 Comparison in actual dc link voltage to VSC and reference voltage during fault for

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