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| A Dual-Output T-Type Three-Level Inverter Topology Based on Split Source Inverter |
| Wang Rutian1, Wang Hao1, Yuan Shuai2, Shao Xinming1, Liu Chuang1 |
1. Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin 132012 China;
2. School of Electrical Engineering Southeast University Nanjing 210096 China |
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Abstract Multi-level inverters perform better than two-level inverters. Using dual output inverters to reduce the number of switching tubes is a trend in developing power electronic topologies for cost reasons. The conventional voltage-source inverter is a buck topology. In many application scenarios, a DC boost topology is often added before the inverter topology to meet the high-magnitude requirements of the output-side voltage. This paper proposed a dual output T-type three-level inverter topology based on a split-source inverter (SSI) using SSI topology to improve the dual output T-type three-level converter.
The SSI topology can reduce the high-magnitude requirements for the DC supply voltage and hardware cost, improving power efficiency. The hardware cost was saved by multiplexing the switching tubes in the inverter and DC boost links. The DC supply voltage passed through the SSI topology and charged the capacitor on the DC side of the inverter link. Thus, the DC side voltage of the inverter link was high, i.e., the high-magnitude requirement of the DC supply voltage was reduced. The energy transfer path was shortened, and the power efficiency was improved.
A separate SSI topology controls the capacitor voltage. The charging of each DC-side capacitor in inverter was completed by a separate SSI topology, and the capacitor charge or discharge duty cycle was controlled by the modulation process of the inverter. If the capacitor is charged and discharged normally, even in the case of open-loop control, the capacitor voltage will not lose stability, thus simplifying the control of the neutral-point potential balance.
A method for determining the range of modulation parameters based on the input and output parameters of the operating parameters was proposed. The boost multiple of the DC link is related to the modulation parameters, and the input parameters are related to the capacitor voltages and modulation parameters of the inverter link. Therefore, combined with the constraint relationship, this paper proposed a method to determine the range of modulation parameters. The range of modulation parameters was discussed under in-phase common frequency (CF), non-in-phase CF, and different frequency (DF) operation modes.
This paper discussed the fluctuation of the inductor current under the sinusoidal pulse width modulation (SPWM) scheme and the harmonic injection SPWM scheme with different harmonics in the sinusoidal modulation wave. Firstly, the harmonic component of the inductor current under the SPWM scheme was discussed. Then, the harmonicamplitude in the third harmonic injection PWM, the Max-Min PWM scheme in the space-vector pulse width carrier modulation, and the DC offset of the discontinuous PWM scheme in the SVPWM were discussed.
Finally, the experimental prototype was built. The experiments were carried out in CF and DF operation modes, which verifies the proposed topology, the modulation parameter selection method, and different modulation schemes on the low-frequency ripple content under the same hardware conditions.
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Received: 11 December 2023
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2024, Vol. 39 
