Improvement in Performance of Series Z-Source Inverter with an Application as Solar PV Fed Water Pump

Abstract

For a stand-alone solar pump, Z-source inverter (ZSI) is being preferred because of its single-stage power conversion capability with buck-boost ability. As compared to traditional ZSI, series Z-source inverter (SZSI) reduces the voltage stress on capacitor and inrush current of the inductor significantly. In this paper, modes of operation of the SZSI for an induction motor load are explained. When an induction motor runs at a low power factor, an additional mode exists. In this mode, high-magnitude pulses appear on the DC link voltage if the decoupling capacitor is not used with an unidirectional source like solar photovoltaic (PV). In addition, an improved modulation technique is proposed to improve the performance of SZSI. This paper presents a performance of SZSI with solar photovoltaic as a source and an induction motor coupled with the centrifugal pump as a load. Simulation results show the performance of the proposed scheme. Experimental and simulation results demonstrate the validity of analysis. Therefore, SZSI is a promising topology for the solar PV stand-alone system.

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Abbreviations

I inn :

Source current, A

I Ln :

Inductor current, A

I Cn :

Capacitor current, A

I linkn :

DC link current, A

V link :

DC link voltage, V

\(\Delta t = t - t_{n}\) :

Change in time period, s

V dc :

DC voltage in LC circuit, V

\(\omega = \frac{1}{{\sqrt {\rm LC}}}\) :

Resonant frequency of LC circuit

T s :

Period of carrier frequency, seconds

I LM :

Maximum value of inductor current, A

M :

Modulation index

D :

Shoot through ratio

V C :

Capacitor voltage, V

V PV :

Solar PV voltage, V

V L :

Inductor voltage, V

V P :

Decoupling capacitor voltage, V

f s :

Switching frequency, Hz

r L :

Equivalent resistance of inductor, Ω

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Correspondence to Rahul Adle.

Appendix

Appendix

Flow chart for process system control is shown in Fig. 26.

Fig. 26
figure26

Flow chart of the system

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Adle, R., Renge, M. & Muley, S. Improvement in Performance of Series Z-Source Inverter with an Application as Solar PV Fed Water Pump. Iran J Sci Technol Trans Electr Eng 44, 1263–1279 (2020). https://doi.org/10.1007/s40998-020-00310-y

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Keywords

  • Z-source inverter
  • Series Z-source inverter
  • Sinusoidal pulse width modulation
  • Shoot through
  • Induction motor
  • Solar photovoltaic
  • Water pumping