Abstract: For realizing marketization of voltage sag governance, two major problems need to be solved: lowering the investment cost and reasonably setting the service fee. A method for whole-process voltage sag risk quantification is thus proposed based on the process immunity time (PIT). Combined with the service cost of sag governance, an optimal configuration model of voltage sag governance equipment considering maximum risk removal is proposed to realize the optimal governance service scheme decision-making to meet the needs of users. On the basis of introduction of the satisfactory price strategy, definition of the satisfaction degree of both power supply companies and users, and clarification of their interest demands, a value-added service pricing model of voltage sag governance is proposed based on mutual satisfaction. Finally, taking a chemical plant in China as an example, the feasibility and rationality of the proposed method are verified through case study. The proposed method is helpful to the implementation of value-added service for voltage sag control, thus solving the voltage sag problems of users and alleviating the contradiction between power supply and consumption, which is of great practical value.

Key words: voltage sag, pricing, risk assessment, governance services, mutual satisfaction