Investigation of a Low-Speed Commutation Voltage Shock Prob-Lem in Three-Level ANPC Inverter Hybrid Modulation Mode

• DOI: 10.20944/preprints202312.1046.v1
• Publication Date: 2023-12-15T01:19:27Z
• Authors: Jian Yu; Renhui Shen; Le Zhou; Zelin Jia; Yulong Hao
• Keywords: Overvoltage; Ringing

With the development of photovoltaic industry, there will be an increasing demand for efficient, high-power density, and low-cost grid interface converters. Compared with two-level inverters, multilevel inverters have following advantages: (1) lower device voltage ratings; (2) better output filtering spectrum; (3) electromagnetic interference (EMI) noise; (4) higher switching speed capability. However, complex circuit inverter bring more parasitic inductance, resulting in serious overvoltage (ringing). Consider that commonly used absorption schemes are effective only or sup-pression oscillations. Therefore, a new is proposed this paper, which can not alleviate ringing phenomena but also suppress effect jumps during low-frequency on high-frequency input voltage. This characterized by low overvoltage, fast damping, minimum ca-pacitance. Experiments simulations conducted to verify effectiveness using three-level ANPC as prototype. The results show significantly reduce level, shorten oscillation time, difference between upper DC bus capacitors.