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Adaptive Nearest Level Modulation for Multilevel DC-Link Inverter With Enhanced Performance
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DOI：10.1109/jestpe.2026.3688734.png)
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Abstract
En 中文
Multilevel inverters (MLIs) are commonly used to interface renewable energy sources, like solar photovoltaic (PV) systems, to the grid. This article presents a method to enhance the performance of a single-phase asymmetric multilevel DC-link inverter (MLDCLI). The MLDCLI is designed to generate a 15-level staircase output utilizing three input DC sources. A simplified gate pulse generation (SGPG) technique is used to control the inverter. Moreover, an adaptive nearest level modulation (ANLM) scheme is used to improve the output quality. This scheme recalculates the switching angles automatically when the input DC voltages change. This helps to maintain a lower total harmonic distortion (THD) and a higher number of levels under variable DC input conditions. The proposed ANLM algorithm and switching logic are implemented using a Raspberry Pi Pico W microcontroller and experimentally validated. In addition, a PV system with maximum power point tracking (MPPT) was simulated in Typhoon HIL to assess the system response under dynamic irradiance. The suggested solution shows an attractive way to improve MLDCLI performance for solar PV applications. Adapting to source changes ensures robust operation under variable DC input conditions.
Keywords:
Multilevel DC-link inverter (MLDCLI)
nearest level modulation (NLM)
renewable energy systems
simplified gate pulse generation (SGPG)
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4.9
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249
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