Despite their high costs, active harmonic mitigation solutions such as parallel active power filters (APFs) and active front end (AFE) drives are growing in popularity. As the newest technology, they are being touted as a better choice than the various forms of passive harmonic mitigation solutions that are presently available. Is this actually the case? Active solutions incorporate switching strategies using insulated-gate bipolar transistors (IGBTs) to make the current drawn by the adjustable-speed drive (ASD), or another nonlinear load, more sinusoidal. You will rarely hear from manufacturers that this switching introduces higherfrequency harmonics, normally above the 50th. When measurements are taken up to the 50th harmonic, the current total harmonic distortion (ITHD) is often quite low. However, when measured up to the 100th harmonic or higher, the ITHDs almost always exceed their claimed performance levels, which consider only harmonics up to the 50th. This is certainly a concern because higher-frequency harmonics are more likely to cause power system problems and issues with other connected loads than the lower-frequency harmonics that they are designed to reduce.

中文翻译：

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主动谐波缓解：制造商不会告诉您的内容！

尽管成本高昂，但诸如并联有源电源滤波器 (APF) 和有源前端 (AFE) 驱动器等有源谐波抑制解决方案越来越受欢迎。作为最新技术，它们被吹捧为比目前可用的各种形式的无源谐波缓解解决方案更好的选择。实际情况是这样吗？有源解决方案采用了使用绝缘栅双极晶体管 (IGBT) 的开关策略，以使可调速驱动器 (ASD) 或其他非线性负载汲取的电流更加正弦。您很少会从制造商那里听到这种切换会引入更高频率的谐波，通常高于 50 次。当测量达到 50 次谐波时，当前的总谐波失真 (ITHD) 通常非常低。然而，当测量到 100 次谐波或更高时，ITHD 几乎总是超过他们声称的性能水平，其中只考虑了 50 次谐波。这当然是一个问题，因为与设计用于减少的低频谐波相比，高频谐波更有可能导致电力系统问题和其他连接负载的问题。