Abstract
Inverters are often used in uninterruptible power supplies (UPS) and form a major portion of the switched mode power converters that are being used. Research is being carried continuously towards making power converters more reliable. The goal is to maintain the desired output over wide range of loading conditions and transients, thereby keeping the total harmonic (THD) as low as possible. This paper presents a control technique, with filter capacitor current feedback that forms the inner loop and the output voltage feedback that forms the outer loop of the control system. Sinusoidal pulse width modulation (SPWM) with modified unipolar switching is employed to obtain sinusoidal output using the H-bridge. Analysis of the H-bridge by means of mathematical modelling using state-space analysis is used to design the compensators for the two loops. Simulation results exhibits THD of less than 0.5% for all kinds of linear loads and less than 1% for nonlinear loads with high crest factor of up to four.
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Puranik, P., Kumari, M.A., Suryanarayana, K., Prasad, K.K. (2020). Control Loop Design of DC–AC Power Supply with High Crest Factor Nonlinear Loads. In: Kalya, S., Kulkarni, M., Shivaprakasha, K. (eds) Advances in Communication, Signal Processing, VLSI, and Embedded Systems. Lecture Notes in Electrical Engineering, vol 614. Springer, Singapore. https://doi.org/10.1007/978-981-15-0626-0_39
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DOI: https://doi.org/10.1007/978-981-15-0626-0_39
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