Design and Implementation of a Sensor less Multilevel Inverter with Reduced Part Count - 2017


This letter proposes a single-section nine-level (9L) inverter topology appropriate for grid-connected renewable energy systems. The proposed inverter is realized employing a T-kind neutral-purpose-clamped inverter connected in cascade to a floating capacitor (FC) H-bridge. Additionally, 2 low-frequency switches are added across the dc-link enabling the inverter to come up with a 9L waveform. A sensorless voltage control primarily based on redundant switching state is developed and embedded with PWM controller, that is responsible for regulating the FC voltage at one-quarter of the dc source voltage. The proposed PWM technique employs the generation of 9L waveform without using any voltage sensor, thereby reducing the complexity of the overall control scheme. This, in flip, can make the system appealing for various industrial applications. In comparison to traditional and up to date topologies, generation of the 9L waveform using a lower number of elements is the notable contribution. Another vital feature of the proposed inverter is that if FC H-bridge fails, it will be bypassed, and the inverter can still operate as a 5L inverter at its nominal power rating. Furthermore, a comprehensive comparison study is included which confirms the deserves of the proposed inverter against those of different state-of-the-art topologies. Finally, simulation and experimental results are included for validating the feasibility of the proposed system.

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