The increasing penetration level of power electronic converters in distribution networks has raised concerns about the impact of these converters on the power quality of the grid. Pulse-width modulated (PWM) voltage generated by these converters creates higher frequency current distortion around both its switching frequency and multiples, which could be circulated through the grid. Consequently, it is essential to understand and analyse the frequencies and amplitudes of these harmonics in terms of load parameters. Thus, this study proposes an analytical method to find the inverter current harmonics generated by PWM signal in terms of the load parameters, including its power factor. The impact of the load power factor on the inverter current harmonics has been found to be significant using the derived equations. Simulation and practical results have confirmed the accuracy of the obtained equations to calculate the inverter current harmonics. The mathematical modelling is important for harmonic analysis of converter within 2–9 kHz range as a new standard has been developed by IEC SC77A, WG1 committee.

中文翻译：

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三相功率转换器工作模式对配电网络中谐波发射的影响：2–9 kHz内的谐波发射

电力电子转换器在配电网络中渗透率的不断提高，引起了人们对这些转换器对电网电能质量的影响的担忧。这些转换器产生的脉宽调制（PWM）电压会在开关频率及其倍数附近产生更高频率的电流畸变，该畸变可能会通过电网流通。因此，必须根据负载参数了解和分析这些谐波的频率和幅度。因此，本研究提出一种分析方法，以根据负载参数（包括功率因数）来查找由PWM信号产生的逆变器电流谐波。使用推导方程，已发现负载功率因数对逆变器电流谐波的影响很大。仿真和实际结果证实了所获得方程式的正确性，以计算逆变器电流谐波。由于IEC SC77A WG1委员会已经开发了新标准，因此数学建模对于2–9 kHz范围内的转换器谐波分析非常重要。