Comprehensive evaluation of power quality based on meaningful classification

In a liberalized electricity market, it is not surprising that different customers need different power quality levels with different price. So how to achieve the synthetic grading evaluation of power quality becomes a concerned problem. In this paper, the idea of classified evaluation of power quality is emphasized, and the major differences between the continuous and event-based power quality problems both in the characteristics and time scales are analyzed. In addition, least squares support vector machine (LSSVM) theory is applied to the comprehensive evaluation of continuous power quality. Meanwhile, power supply reliability index is introduced to evaluate the overall quality level of the event-based power quality. On this basis, subjective weighting method is used to achieve the comprehensive evaluation of two types of power quality problems. Comprehensive evaluation of power quality based on meaningful classification not only highlights the two types of power quality problems, but also achieves the overall level of power quality.