Small-Signal Discrete-Time Modeling and Stability Analysis of Digital-Controlled DC-AC Converter with Symmetric PWM | IEEE Conference Publication | IEEE Xplore

Small-Signal Discrete-Time Modeling and Stability Analysis of Digital-Controlled DC-AC Converter with Symmetric PWM


Abstract:

Exact small-signal discrete-time model can be used for direct design of digital compensators for digitally controlled PWM DC-DC converters. Based on quasi-static approxim...Show More

Abstract:

Exact small-signal discrete-time model can be used for direct design of digital compensators for digitally controlled PWM DC-DC converters. Based on quasi-static approximation, this modeling approach for DC-DC converters can be extended to DC-AC converters. This paper proposed a small-signal discrete-time modeling approach for digitally controlled DC-AC converter driven by symmetric PWM signal, which is widely used in practice. The proposed model is based on well-known approaches to discrete-time modeling and the standard Z-transform and is well suited for stability analysis and direct digital compensator design. This paper presents general results valid for any digital-controlled converters with symmetric PWM. Specific examples, including close-form expressions for control-to-output transfer function and stability boundary are given for H-bridge current source inverter. The model is verified by experiment and system identification.
Date of Conference: 16-19 July 2019
Date Added to IEEE Xplore: 14 November 2019
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Conference Location: Edinburgh, UK

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