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This paper presents a novel approach to control an AC/DC converter without using any current sensors. The AC/DC converter is based on the well-known boost PFC topology. Due to the particular structure of the boost PFC AC/DC converter, sensorless control of the converter is very challenging. As illustrated in this paper, the converter loses its observability for some operating points. This is the reason...
This paper presents sensorless techniques for a grid-connected voltage source inverter with an LCL-filter in order to improve the closed-loop control performance and reduce the overall cost of the converter through an observer-based control approach. The observability of the system is mathematically analyzed using the system state-space equations, and then two state observers are designed and the...
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