Analysis of RCD snubber based non-ideal Z-source inverter using average modelling approaches

Z-Source inverters (ZSIs) are one of the most promising single-stage power converters in modern industrial applications. However, these ZSIs exhibit non-minimum phase behaviour as a result of right half-plane (RHP) zero in the converter transfer functions and impose a constraint on the controller de...

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Bibliographic Details
Published in:International journal of electronics 2020-05, Vol.107 (5), p.755-777
Main Authors: Reddivari, Reddiprasad, Jena, Debashisha
Format: Article
Language:English
Subjects:
Basic converters
Canonical circuit model
circuit averaging
Control systems design
Damping
DC-DC converter
Design
Feedback control
Industrial applications
Inverters
mathematical modelling
Mathematical models
Optimization
Order parameters
parasitic variable
Parasitics (electronics)
Power converters
Proportional integral derivative
Resonant frequencies
right half plane zero
small-signal model
state-space averaging
Step response
Transfer functions
Voltage gain
Z-source inverter
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Summary:Z-Source inverters (ZSIs) are one of the most promising single-stage power converters in modern industrial applications. However, these ZSIs exhibit non-minimum phase behaviour as a result of right half-plane (RHP) zero in the converter transfer functions and impose a constraint on the controller design. A detailed mathematical model of the converter plays a crucial role in the design of an efficient control strategy. This paper presents a detailed mathematical model of non-ideal ZSI using averaged modelling approaches and its comparisons are summarised. The pole-zero and step response plots reveals the impact of parasitic elements and parameter variations on system steady-state and dynamic performance. Finally, the effects are outlined, which gives a basic guideline to the designers in the converter performance optimisation such as the feedback control bandwidth, damping factor, resonant frequency, and overshoot/undershoot in the desired output. The sensitivity function is defined for a voltage gain of ZSI with respect to system parasitic elements and snubber parameters. In order to validate the theoretical analysis of converter dynamics, a laboratory prototype model of 50 watts ZSI is developed. Further, a hardware implimentation of PID-based capacitor voltage control is shown to check the effectiveness of the derived transfer functions on closed-loop performance.
ISSN:0020-7217
1362-3060
DOI:10.1080/00207217.2019.1672811