A wavelet modulation method for a quasi-Z-source inverter
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摘要: 提出一種適用于準Z源逆變器的小波調制策略，通過改變傳統小波調制采樣點位置，增大直通占空比的調節范圍.將直通矢量分為兩等份，分別插入采樣時刻兩端，使其不需額外增加開關頻率，且理論上可獲得最大恒定直通占空比.對所提小波調制與兩種傳統準Z源逆變器調制策略進行比較，對準Z源逆變器不同調制策略的升壓能力、效率、諧波、調制比進行了系統的理論分析，最后通過仿真對所提方法進行驗證.理論與仿真均表明，所提小波調制具有諧波小、電壓利用率高、升壓能力強等優點.Abstract: A wavelet modulation strategy applied to a quasi-Z-source inverter was proposed. The regulating range of the shootthrough duty ratio could be increased by changing the locations of the sampling points set using traditional wavelet-modulation. The proposed modulation strategy divided the shoot-through zero vector into two portions, which were then individually inserted into both ends of the sampling time. Under the proposed strategy, the quasi-Z-source inverter could obtain a theoretical maximum constant shoot-through duty ratio without any extra switching frequencies. In addition, the proposed strategy was compared with traditional modulation strategies used in quasi-Z-source inverters. The boosting capacity, efficiency, harmonic and modulation ratio of the different modulation strategies for quasi-Z-source inverter were analyzed thoroughly. Finally, the performance of the proposed method was verified by simulation. Both the simulation results and theory verify that the strategy can reduce harmonic, increase voltage utilization rate, and enhance the boosting capacity.
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參考文獻
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