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A multi-phase impedance source inverter with an improved controller structure

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Abstract

Impedance source inverters (ZSIs) have many advantages like the ability to work as a buck or boost inverter and work with different renewable energy sources and can be applied as a voltage source or current source inverter. The switching circuits of ZSI normally are complicated and hard to be implemented. In this paper, a modified sinusoidal pulse width modulation method for ZSI block is presented based on an optimized mathematical model in order to switch the power components of this inverter. The proposed switching structure can be extended to more than one phase, by using the combination of the step-up converter, ZSI networks with the same switching topology for per phase and a full bridge inverter block in order to present a pure sinusoidal wave in the structure’s output especially for resistive and inductive loads which are the real and industrial types of the loads. The Boost converter has been applied in our proposed structure in order to enhance the level of the generated voltages by RESs. Due to the ability to increase the voltage across the wide range, good resistance to electro-magnetic interference, acceptable total harmonic distortion value of the waves and immunity through shoot, this converter can be used extensively in PV systems, cell fuel, wind power and UPS systems. One of the most important specifications of the proposed switching method is working with low and intermediate values of duty cycles for power MOSFETs that can decrease the dynamic losses of the inverter. A wide range of mathematical analysis and simulations have been done to explain the proposed method, and experimental results confirm the theoretical analysis by a 100 W laboratory prototype.

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Abbreviations

ZSIs:

Impedance source inverters

RESs:

Renewable energy sources

VSI:

Voltage source inverter

CSI:

Current source inverter

EMI:

Electro-magnetic interference

THD:

Total harmonic distortion

TS:

Through shoot

DGs:

Distributed generators

FCs:

Fuel cells

PVs:

Photovoltaics

PEIs:

Power electronic interfaces

ESSs:

Energy storage systems

QZSI:

Quasi-impedance source inverter

SZSI:

Serial impedance source inverter

SBI:

Switched based increasing inverter

LZSI:

Self-locked impedance source inverter

PWM:

Pulse width modulation

SPWM:

Sinusoidal pulse width modulation

SHS-PWM:

Selective harmonic snubber PWM

FLC:

Fuzzy logical controller

Z:

Zero

NS:

Negative small

NM:

Negative medium

NB:

Negative big

PS:

Positive small

PM:

Positive medium

PB:

Positive big

MPP:

Maximum power point

CCM:

Continuous conduction

DCM:

Discontinuous conduction modes

E :

Error

∆E :

Change values for the error

P(t):

The output power of the boost converter

V(t):

The input voltage for the boost converter

P(t − 1):

The power value of the boost converter for the previous moment

V(t − 1):

The voltage value of the boost converter for the previous moment

D :

Duty cycle

V IN1 :

The input voltage of the boost converter

V O1 :

The output voltage of the boost converter

G 1 :

The voltage gain of the boost converter

V IN2 :

The input voltage for the second block

V O2 :

The output voltage for the second block

V m :

Amplitude of output voltage of the ZSI

ω :

Angular velocity of output voltage of the ZSI

G 2 :

The voltage gain of the ZSI block

L1, L2 and L3 :

Inductors of first and second block

C1, C2 and C3 :

Capacitors of first and second block

f s :

Switching frequency

M :

Modulation index

L :

Inductor for the boost converter block

L1 and L2 :

Inductors for the ZSI block

C :

Capacitor for the boost converter block

C1 and C2 :

Capacitors for the ZSI block

V IN1 :

Input voltage for the boost converter block

V O1 :

Output voltage for the boost converter block

V O2 :

Output voltage for the upper ZSI block in two-phase approach

V O3 :

Output voltage for the downer ZSI block in two-phase approach

V O :

Output voltage for the FBI block

I L :

Inductor current for the boost converter block

∆IL :

Inductor current ripple

∆VC :

Capacitor voltage ripple

iL1 and iL2 :

Inductors currents for the ZSI block

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Authors and Affiliations

  1. Electrical and Electronics Engineering Department, Bursa Technical University, Bursa, Turkey

    Davood Ghaderi

  2. Department of Electrical Engineering, Iran University of Science and Technology, Narmak, Tehran, 16846-13114, Iran

    Dina Molaverdi

  3. Department of Electrical Engineering, Hamedan University of Technology, Hamedan, 65155, Iran

    Alireza Kokabi

  4. Energy Production and Infrastructure Center, University of North Carolina at Charlotte, Charlotte, NC, 28223, USA

    Behnaz Papari

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  1. Davood Ghaderi
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  2. Dina Molaverdi
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Correspondence to Davood Ghaderi.

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Ghaderi, D., Molaverdi, D., Kokabi, A. et al. A multi-phase impedance source inverter with an improved controller structure. Electr Eng 102, 683–700 (2020). https://doi.org/10.1007/s00202-019-00903-9

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