Abstract
In this paper, a Current Control Scheme (CCS) for three phase 3-level Neutral Point Clamped (NPC) Inverter using Min–Max (MM) algorithm approach has been presented. The inverter topology basically consists of four unidirectional switches, two clamping diodes per phase and common split dc link capacitors have been provided for all phases at input side. At the input side of an inverter, balanced dc link capacitors are considered through the application of either dc link chopper or Three Level Boost Converter (TLBC) circuits. An LCL filter is connected to the output of inverter circuit and is integrated with the grid to achieve higher ripple attenuation capability. Here, the MM algorithm is nothing but an offset addition to the respective modulating signals then it follows like Space Vector Pulse Width Modulation (SVPWM) technique without the need of any dwell time calculations and finally control complexity can be reduces. Here, a Synchronous Reference Frame (SRF) Phase Locked Loop (PLL) has been utilized to generate reference grid variable for grid synchronization. In the grid connected closed loop operation, an inverter current feedback system is used. The d-axis and q-axis current reference values were utilized to inject active and reactive powers into the grid respectively. Usually, the d-axis current reference is taken from the dc link voltage controller and for Unity Power Factor Operation (UPF) of the grid, the q-axis current reference is taken as zero. Finally, the operation and control approach of grid connected inverter with LCL filter has been validated through MATLAB/Simulink environment.
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Supriya, B., Palle, K., Bhanuchandar, A., Sakile, R., Vamshy, D., Kumar, K.B. (2023). A Current Control Scheme of Three Phase Three-Level Neutral Point Clamped Grid Connected Inverter Using Min–Max Algorithm Approach. In: Namrata, K., Priyadarshi, N., Bansal, R.C., Kumar, J. (eds) Smart Energy and Advancement in Power Technologies. Lecture Notes in Electrical Engineering, vol 927. Springer, Singapore. https://doi.org/10.1007/978-981-19-4975-3_20
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DOI: https://doi.org/10.1007/978-981-19-4975-3_20
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