It is possible to find different definitions in various sources related to electrical power quality. According to some sources, electric power quality is defined as the reliability of the electrical network systems and only voltage quality. However, these definitions are insufficient to explain the concept of electric power quality.
To make a comprehensive definition, we can say that electrical power quality can be defined as a series of electrical parameters and limits that enable end-user loads or equipment connected to the electrical network to operate in the desired manner without any significant performance and lifetime loss.
On the other hand, electrical power quality problems can be defined as power problems caused by voltage, current, and frequency changes that cause malfunction or malfunction of end-user loads or equipment connected to the mains.