Abstract
In this paper, a model predictive control for an asymmetric T-type NPC 3-level inverter is presented. The mathematical model and characteristics of the reduced switching topology are described. An improvement for the predicted strategy with the pre-selected candidate vectors is proposed. The simulation and experimental results are provided and show good efficiency for the proposed control algorithm. The improved algorithm greatly reduces execution time by about 18% and delivers a better load current THD than the conventional model for predictive control. For comparison, similar tests are performed on both 2-level and conventional 3-level inverters. Although the current load quality of the asymmetrical inverter is not as good as the traditional 3-level inverter, it is much better than the 2-level inverter. In addition, it has the benefits of significantly reducing overall costs, simpler hardware system design, and faster predictive processing than the conventional 3-level inverters. Therefore, this asymmetric inverter has advantages for an application with the required output characteristics like the conventional 3-level inverter and with lower cost.
Highlights
Nguyen Gia Minh ThaoThree-level voltage source converters have been widely used in industrial applications, which include high-power motor drivers [1], electric vehicles [2], and grid-connected renewable energy conversion systems [3]
The T-type neutral point clamped (NPC) inverter was more efficient than traditional NPC inverters up to the medium switching frequency range [7,8,9,10]
3-level NPC inverters have many advantages compared with 2-level inverters, as mentioned above, their main disadvantages are a higher cost, increased system volume, and reduced reliability because of the increased number of devices
Summary
Three-level voltage source converters have been widely used in industrial applications, which include high-power motor drivers [1], electric vehicles [2], and grid-connected renewable energy conversion systems [3]. An improved model half-bridge leg to the 2-leg 3-level NPC inverter This new configuration, as shown in Figpredictive control (IMPC) algorithm for this configuration is proposed for current tracking ure 2, enables twice the output voltage range compared to Figure 1. The candidate vector selection strategy is presented to predictive control (IMPC) algorithm for this configuration is proposed for current tracking avoid high voltage jumps in phase legs without designing any additional cost functions. This significantly reduces execution time and switching frequency and improves load cur-.
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