Multiple power electronic converters are frequently cascaded in different stages, depending on the load requirements. This conversion stage begins with a Front-End rectifier having the control objective of regulating the DC link voltage and assuring sinusoidal input current in phase with the AC input voltage, followed by a load-side converter that controls the output voltage required by the load. As a result of the cascading, the overall system performance deteriorates, resulting in suboptimal performance, even if the individual sub-systems are designed with adequate stability margins. This paper focuses on this issue by examining how the individual converters and their control loops interact at their coupling point. A single-phase boost Power Factor Corrected (PFC) rectifier cascaded with two high bandwidth voltage-regulated buck converters, is presented here as an example of cascaded system control loop design. A detailed step by step modeling of the impedances of these converters, as well as the study of their mutual interaction in understanding the system stability, is examined. To validate the results of the analysis, detailed simulation results are presented.
Design Considerations in the Control of Front-End PFC Rectifier Cascaded with Voltage Controlled Loads
2022-08-04
3691173 byte
Conference paper
Electronic Resource
English
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