【摘要】 谐波检测是电能质量治理的关键环节,是保证准确补偿谐波电流的基础。具备谐波检测功能的多功能并网变流器(MFGCI)在进行指定次谐波分量补偿时,传统检测方法对锁相环锁相精度要求较高,并且存在两相旋转到两相静止坐标系的坐标变换。为简化谐波检测环节,降低对锁相环精度的依赖,本文基于低通/带通可变滤波器,提出一种基于可变滤波器的谐波检测方法,在不同应用场景下人为设定滤波器工作于低通模式或带通模式,简化了坐标变换环节,降低了设计锁相环时的精度要求。最后通过实验验证了所提检测方法的有效性与正确性。更多还原

【Abstract】 Harmonic detection is a fundamental aspect of power quality management,serving as the foundation for precise compensation of harmonic currents.When the multi-functional grid-connected inverter(MFGCI) with harmonic detection functionality is employed to rectify the specified subharmonic components,the conventional detection approach necessitates a high degree of precision in the phase-locked loop lock-in accuracy,accompanied by a coordinate transformation from two-phase rotation to a two-phase stationary coordinate system.In order to streamline the harmonic detection process and reduce the reliance on the precision of the phase-locked loop,this paper proposes a harmonic detection method based on the low-pass/band-pass variable filter.This approach enables the filter to be set to operate in either low-pass or band-pass mode,depending on the specific application.This simplifies the coordinate transformation link and reduces the accuracy requirements when designing the phase-locked loop.Finally,the efficacy and accuracy of the proposed detection method are validated through experimentation.更多还原