This paper proposes a grid interactive bidirectional solar water pumping system using a three phase induction motor drive (IMD). A single phase voltage source converter (VSC) is used to direct the flow of power from grid supply to the pump and back to the grid from SPV array. A boost converter is used for the maximum power point tracking (MPPT) of the SPV array. A smart power sharing control is proposed, with preference given to the power from SPV array over the grid power. Moreover, the grid input power quality is also improved. Various modes of operation of the pump are elaborated and the performance of the system at starting, in steady state and dynamic conditions are simulated. The simulated results show the novelty and the satisfactory performance of the system.
Fig. 1. Configuration for the single phase grid interactive SPV water
EXPECTED SIMULATION RESULTS:
Fig. 2(a) Starting performance of the proposed system in mode I
Fig. 3(b) Steady state performance of the proposed system in mode I
Fig. 4(c) Performance of the system in mode I under decreasing radiation
from 800 W/m2 to 500 W/m2
Fig. 5(d) Performance of the system in mode I under increasing radiation
from 500 W/m2 to 800 W/m2
Fig. 6(a) Starting performance of the system in mode II
Fig. 7(b) Steady state performance of the system in mode II
Fig. 8(a) Characteristics of the system in mode III with decrease in
Fig. 9(b) Characteristics of the system in mode III with increase in
Fig. 10(a) Characteristics of the system in mode IV with increase in
Fig. 11 (b) Characteristics of the system in mode III with decrease in
A single phase grid interactive solar water pumping is presented in the paper. Various modes of operation are identified and simulated in MATLAB Simulink environment. The simulated results have demonstrated the satisfactory performance of the system at starting, and in steady and dynamic conditions. The proposed system not only is able to share the power between two sources but it also improves the quality of power drawn. Moreover, the system manages to feed the power from the SPV array as in when required. The system is well suited for the rural and agricultural usage.
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