对高效暖通空调系统的需求导致了节能现代变频驱动器（VFD）和电机控制技术的迅速采用。将VFD控制的压缩机、泵和风扇成功引入冷却器和空气处理器，有助于满足这些需求，并导致快速部署到数据中心、医院、发电厂和其他关键冷却市场。变频技术的一些好处包括i）使用高速电机的小型空气处理机组和ii）更高的部分负载系统能效，其中整个系统从电气输入考虑到HVAC负载。然而，如果电平不够低，它们还会产生谐波电流，导致电能质量差和设备故障。随着VFD控制的HVAC设备的采用水平随着谐波水平的增加而增加，了解和缓解谐波和电能质量变得前所未有地重要。 引文:2021篇虚拟会议论文

The demand for higher efficiency HVAC systems has led to fast adoption of energy saving modern variable frequency drives (VFDs) and motor control technology. The successful introduction of VFD controlled compressors, pumps and fans into chillers and air handlers has helped meet these demands and led to rapid deployment into data centers, hospitals, power plants and other critical cooling markets. Some benefits of variable frequency technology include i) smaller air handing packages using high-speed electrical motors and ii) higher partial load system energy efficiency, where the complete system is considered from electrical input to HVAC load. However, they also produce harmonic electric currents that lead to poor electrical power quality and equipment failure if levels are not kept low enough. Harmonics and power quality have never been more important to understand and mitigate as the adoption levels of VFD controlled HVAC equipment increase along with increasing harmonic levels.