Research on a New Inverter Control Strategy of Induction Heating Power Supply
Abstract
:1. Introduction
2. Technical Specifications
3. New Inverter Control Strategy
3.1. Circuit Structure
3.2. Unipolar Frequency-Doubling SPWM Modulation Principle
3.3. Circuit Operating Principle
3.4. Circuit Parameter Design
- (1)
- Selection of voltage divider capacitors
- (2)
- Design of compensation inductor parameters
- (3)
- Design of compensation capacitor parameters
- (4)
- Selection of clamping diodes
- (5)
- Selection of IGBTs
4. Simulation Verification
4.1. Simulation Setup
4.2. Simulation Comparison
- (1)
- The output power of the inverter with the new control strategy is shown in Figure 7. The design parameters were verified to achieve the rated output power.
- (2)
- The voltage difference between C1 and C2 is shown in Figure 8. As can be seen from Figure 8, the voltage difference between the two ends of the DC capacitor of the single-phase NPC three-level inverter is 0 and the midpoint potential voltage is stable, making the circuit structure suitable for low frequency sine wave generation.
- (3)
- The output currents of the two inverter circuits are shown in Figure 9. The current in the single-phase NPC inverter is much smaller than that in the single-phase full-bridge inverter. Therefore, it increases the flexibility of the selection of components such as reactors, capacitors, and conductive cables that are selected based on the current in the single-phase NPC circuit.
- (4)
- The voltages across the load and IGBTs in the two inverter circuits are shown in Figure 10 and Figure 11. It is known that the dc bus voltage of the single-phase NPC inverter circuit is 1000 V and the dc bus voltage of the single-phase full-bridge inverter is 540 V. It can be seen from the figures that when the voltages across the IGBTs in the two inverters are similar, the output voltage of the single-phase NPC inverter is nearly twice that of the single-phase full-bridge inverter, achieving the goal “high voltage, low current”.
- (5)
- The FFT analysis of the output voltages of the two inverters is shown in Figure 12 and Figure 13. The THD value of the output voltage with the new control strategy is 0.08%, while the THD value of the output voltage with the traditional control strategy is 0.48%. There is a reduction of 0.40% for the former compared with the latter. This verifies that the new control strategy can improve the quality of the inverter’s output waveform.
5. Conclusions
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
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Design Objective | Values | Unit |
---|---|---|
Busbar Voltage (Ud) | 1000 | V |
Rated Power (Pmax) | 100 | kW |
Working Frequency (fo) | 50 | Hz |
Carrier Frequency (fs) | 6000 | Hz |
Inversion Efficiency () | 95% | - |
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Huang, H.; Kong, Y.; Chen, J.; Jian, W.; Sun, F.; Sui, J.; Cheng, S. Research on a New Inverter Control Strategy of Induction Heating Power Supply. Electronics 2024, 13, 3469. https://doi.org/10.3390/electronics13173469
Huang H, Kong Y, Chen J, Jian W, Sun F, Sui J, Cheng S. Research on a New Inverter Control Strategy of Induction Heating Power Supply. Electronics. 2024; 13(17):3469. https://doi.org/10.3390/electronics13173469
Chicago/Turabian StyleHuang, Haibo, Yulin Kong, Jianfei Chen, Wei Jian, Fan Sun, Jixiang Sui, and Shiqing Cheng. 2024. "Research on a New Inverter Control Strategy of Induction Heating Power Supply" Electronics 13, no. 17: 3469. https://doi.org/10.3390/electronics13173469