研究目的
To introduce a cost-effective combinational modulation method for single-phase inverters that eliminates even-order harmonics at the PWM stage, reducing the need for high-frequency switching devices and improving harmonic distortion.
研究成果
The proposed combinational modulation method effectively eliminates even-order harmonics at the PWM stage, offering a cost-effective solution by reducing the need for high-frequency switching devices. It demonstrates superior harmonic distortion performance compared to the 3-LDPWM method, especially at low sampling frequencies, with minimal additional production cost.
研究不足
The study's limitations include the practical difficulty of achieving exact π radian phase shifts for all frequency components due to non-zero group delays, which can affect harmonic cancellation efficiency. Additionally, the method's performance is compared only against the 3-LDPWM method, not encompassing all potential modulation strategies.
1：Experimental Design and Method Selection:
The study employed a combinational modulation method for single-phase inverters, focusing on eliminating even-order harmonics at the PWM stage. A regular sampling technique based on real-time calculation was used to verify the method's feasibility.
2：Sample Selection and Data Sources:
A 500-W single-phase voltage source inverter was used as the test setup. Performance characteristics like switching losses and harmonic distortions were measured and compared with a classic inverter modulation method.
3：List of Experimental Equipment and Materials:
The setup included a digital signal controller platform, SiC MOSFETs, IGBTs, and a logic circuitry for PWM signal generation and processing.
4：Experimental Procedures and Operational Workflow:
The method involved generating two antiphase sinusoidal reference signals, comparing them with triangular waveform carriers to produce PWM signals, and using combinational logic to subtract these signals for even-order harmonic cancellation.
5：Data Analysis Methods:
Performance was evaluated based on switching losses and harmonic distortions, with results compared against traditional methods.
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