On the distribution grid, renewable energy (RE) sources are widely used to meet the growing demand for power and mitigate the catastrophic effects of conventional energy sources on global warming. The use of distributed energy sources is growing as a result. A high penetration of distributed generating resources in the distributed system offers various advantages in terms of efficiency, high-power quality, and low carbon emissions in the power system. Apart from the pros, the penetration of DGs in the distributed power system tends to increases several safety and operational issues and one of the most serious safety issues is the power quality (PQ) disturbances like sag, swell, interruption, harmonics, flickering, etc. Power quality issues are become more frequent as renewable energy sources are employed more extensively because of shifting outputs and interface converters. The user must be provided with clean electricity; thus, PQ interruptions must be identified and minimized. Numerous studies have been conducted to reduce the complexity of power quality issue detection. This study offers a comprehensive assessment of several power quality disturbance diagnosis methods, encompassing both identification and categorization, starting with a synopsis.