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A comparative study between SPWM and SHE-PWM modulation techniques for DC-AC inverters

机译:DC-AC逆变器SPWM和SHE-PWM调制技术的比较研究

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DC-AC Inverters are basically used to convert renewable sources DC, like solar energy or storage batteries into AC power. However, the outputs of these converters contain undesirable harmonic distortion due to the ON and OFF switching. There are a number of modulation schemes employed to control ON-OFF the switching of IGBT (or MOSFET) of Inverters and to mitigate these harmonics effectively. The most popular modulation methods in this regard are Sinusoidal Puls Width Modulation (SPWM) and Selective Harmonics Elimination Puls Width Modulation (SHE-PWM). The common parameters between two techniques are modulation index and the number of pulses. A minimum Total Harmonic Distortion (THD) is used as a criterion to comparing results by both techniques. This paper demonstrates the comparison between SPWM and SHE-PWM implemented in the unipolar inverter. To assess and validate the utility of the techniques, simulation results are obtained using MATLAB software.
机译:DC-AC逆变器基本上用于将可再生资源DC(例如太阳能或蓄电池)转换为AC电源。但是,这些转换器的输出由于导通和关断切换而包含不希望的谐波失真。有许多调制方案可用来控制逆变器IGBT(或MOSFET)的开关,并有效地缓解这些谐波。在这方面,最流行的调制方法是正弦脉冲宽度调制(SPWM)和选择性谐波消除脉冲宽度调制(SHE-PWM)。两种技术之间的共同参数是调制指数和脉冲数。最小总谐波失真(THD)用作比较两种技术的结果的标准。本文演示了单极性逆变器中实现的SPWM和SHE-PWM之间的比较。为了评估和验证该技术的实用性,使用MATLAB软件获得了仿真结果。

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