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首页> 外文期刊>Electric Power Components and Systems >Hybrid PWM Methods for Harmonic Reduction in Neutral Point Clamped Three-Level Inverter Drive for Pump Applications
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Hybrid PWM Methods for Harmonic Reduction in Neutral Point Clamped Three-Level Inverter Drive for Pump Applications

机译：用于泵应用的中性点夹紧三级逆变器驱动的谐波减少混合PWM方法

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摘要

Two hybrid PWM methods are proposed in this paper for a pump drive based on three-level Neutral-Point Clamped (NPC) inverter. The envisaged PWM methods are aimed at reducing output voltage harmonic distortion. While the first PWM method incorporates suitable voltage injection to the carrier signals, the second PWM method incorporates voltage injection to both carrier and the modulating signals for controlling the NPC drive. Detailed harmonic analysis is presented using Double Fourier Integral Approach (DFIA) for both the hybrid PWM methods by separately identifying their basic unit cells, their boundaries that demarcates different regions of inverter drive. Complete analytical expressions for dc, fundamental, carrier and side-band harmonic components present in the output voltage of the NPC drive are presented for both the hybrid PWM methods. The proposed PWM methods are simulated using Matlab/Simulink and are experimentally validated using an induction motor driven pump load, following V/f control. Superiority of the hybrid PWM methods in comparison to the existing PWM methods are demonstrated with v_(THD), weighted THD (v_(WTHD)), i_(THD), harmonic loss factor etc., supporting the envisaged PWM methods.
机译：本文提出了两个混合PWM方法，用于基于三级中性点钳位（NPC）逆变器的泵驱动。设想的PWM方法旨在降低输出电压谐波失真。虽然第一PWM方法包含适当的电压注入载波信号，但是第二PWM方法包括电压喷射到载波和用于控制NPC驱动器的调制信号。通过单独识别其基本单元电池，使用双重傅立叶积分方法（DFIA）使用双傅里叶积分方法（DFIA）来提出详细的谐波分析，其划分逆变器驱动器不同区域的边界。对于混合PWM方法，给出了在NPC驱动器的输出电压中存在的DC，基波，载波和侧频谐波分量的完整分析表达式。使用MATLAB / SIMULINK模拟所提出的PWM方法，并使用v / f控制之后的感应电动机驱动泵负载进行实验验证。与现有的PWM方法相比，杂交PWM方法的优越性通过V_（THD），加权THD（V_（WTHD）），I_（THD），谐波损耗因子等来证明，支持设想的PWM方法。

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