Solar Power Based Three-Level Neutral Clamped Inverter Fed DTFC-SVM of an IM Drive

ABSTRACT:

This paper presents a solar power based three-level neutral clamped inverter (3LNCI) fed induction motor drive (IMD) with space vector modulation based direct torque and flux control (DTFC-SVM) for the water pumping applications. Due to the robustness and the flexible operating characteristics, induction motor is most suitable for water pump system. A DC/DC boost converter along with perturb and observe method of maximum power point tracking (MPPT) control technique is employed to draw sophisticated power from the solar photovoltaic (PV) array. The DTFC-SVM of an IMD using 3LNCI is proposed for improving performance and reducing the ripple contents of torque, flux and stator currents. The proposed method is simulated in MATLAB/SIMULINK environment and simulated results are presented under various operating conditions.

KEYWORDS:

  1. Direct torque and flux control
  2. Induction motor drive
  3. Space vector modulation
  4. Three-level diode clamped inverter
  5. Photovoltaic array

SOFTWARE: MATLAB/SIMULINK

BLOCK DIAGRAM:

Fig. 1. Schematic model of DTFC-SVM of IMD

EXPECTED SIMULATION RESULTS:

Fig. 2. Results under no-load torque operating condition using (a) 2LI and (b) 3LNCI: Plot (from top to bottom): (i) Torque, (ii) stator current, (iii) speed, (iv) stator flux qd-components in stationary reference frame.

Fig. 3. Loading performance at 1400rpm using (a) 2LI and (b) 3LNCI: (i) Torque, (ii) speed, (iii) stator current and (iv) error speed.

Fig. 4. Reversal speed Performance using (a) 2LI and (b) 3LNCI: (i) Torque, (ii) speed, (iii) stator current and (iv) stator flux qd-components.

CONCLUSION:

It has been concluded that the solar powered three-level neutral clamped inverter fed induction motor drive with DTFCSVM using proportional-integral controller (PIC) quite suitable for the water pumping applications. The solar panel has been operated at the peak values of voltage, current and power by using a simple perturb and observe method of MPPT algorithm, and the required DC output voltage achieved by using DC/DC boost converter. From the simulation results we can conclude that the three-level SVM based IM drives can provide better performance and torque ripple levels are also lowerd in comparision with Two- level SVM based IM drive.

REFERENCES:

[1] G. S Buja and Kazmierkowski. M. P, “DTC of pwm inverter-fed AC motors – A Survey”, IEEE Trans. on Ind. Elec., vol. 54, no. 5, pp. 744 – 757, 2004.

[2] J. Rodriguez, J. S. Lai, and F. Z. Peng, “Multilevel inverters: a survey of topologies, controls, and applications,” IEEE Trans. Ind. Electron., vol.49, no.4, pp.724-738, 2002.

[3] Tejavathu Ramesh, Anup Kumar Panda, and S. Shiva Kumar. “MRAS Speed Estimator Based on Type-1 and Type-2 Fuzzy Logic Controller for the Speed Sensorless DTFC-SVPWM of an Induction Motor Drive.” Journal of Power Electr., vol. 15, No. 3, pp. 730-740, 2015.

[4] Rodriguez J, Bernet S, Steimer PK, Lizama IE. A survey on neutralpoint- clamped inverters. IEEE Transactions on Industrial Electronics. 57(7):2219-30, 2010.

[5] M. Hamdi, M. Hamouda, F. Fnaiech, and K. Al-Haddad, “Space vector pulse width modulation of multilevel inverters: A new method for selecting the appropriate small hexagon,” 38th Annual Conf. IEEE Industrial Electronics Society (IECON), pp. 774-779, 25-28 Oct. 2012.

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