Research Papers

Efficient Single Stage Photovoltaic Pumping System Using BLDC Motor With Grid Power Export

[+] Author and Article Information
R. Sridhar

Department of Electrical and Electronics Engineering,
Chennai, India
e-mail: sridhar.r@ktr.srmuniv.ac.in

Pradeep Vishnuram, D. Sattianadan

Department of Electrical and Electronics Engineering,
Chennai, India

Contributed by the Solar Energy Division of ASME for publication in the Journal of Solar Energy Engineering. Manuscript received September 4, 2018; final manuscript received March 7, 2019; published online March 27, 2019. Assoc. Editor: Nieves Vela.

J. Sol. Energy Eng 141(5), 051004 (Mar 27, 2019) (8 pages) Paper No: SOL-18-1410; doi: 10.1115/1.4043130 History: Received September 04, 2018; Accepted March 10, 2019

This paper proposes an efficient single-stage photovoltaic (PV) fed permanent magnet brushless DC (PMBLDC) motor water pumping system with grid power interface. The power conditioning system used in the conventional two-stage system is eliminated, and the maximum power point tracking (MPPT) scheme is incorporated within the inverter used for the electronic commutation of the BLDC motor. The BLDC motor pumping is advantageous than the conventional induction motor-aided water pumps. The proposed system is the first of its kind to employ a grid power export scheme utilizing the same inverter drive which in turn reduces the complexity of adding new inverter circuitry and thereby making the system economically viable. The BLDC pump and grid power export scheme is realized in both simulation and hardware environment for a power rating of 1 kW. The results reveal that the proposed system is highly viable.

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Fig. 1

Existing topology: single-stage PV—BLDC water pumping system

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Fig. 2

Block diagram of proposed PV—BLDC water pumping system with grid power export

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Fig. 3

Hybrid FOCV and INC MPPT algorithm

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Fig. 4

BLDC drive algorithm

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Fig. 5

Grid interfacing procedure

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Fig. 6

MPPT output for an irradiation of 1000 W/m2 and 25 °C

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Fig. 7

MPP tracking for varying irradiation

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Fig. 8

Rotor speed of BLDC drive

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Fig. 9

Torque waveform of BLDC drive

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Fig. 10

BLDC pump output characteristic curves

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Fig. 11

Waveform of current, PLL before, and after grid synchronization

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Fig. 12

Voltage harmonics measured at output of inverter



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