Research On Transmission Pricing In The Electricity Market Environment Considering The Reliability Worth

The electric utility industry, in its transition from a regulated to a deregulated environment, faces several technical, economical and political issues. Open transmission access is now one of the most typical issues in electricity markets. As a link of generation and load, the role of transmission network is quite different from that before deregulation and there are some relative fundamental problems such as transmission pricing and reliability to be considered.This thesis makes systematic and thorough studies on problems of reliability under deregulation and transmission pricing. A series of new models have been put forward. The main achievements are as follows:It reviews and comments the theory and practice of electricity markets and reliability issues arising in the electric power utility environment. Results show that the deregulation may have a significant adverse impact on the reliability of power system. Among the most discussed solutions today, such as the reliability criteria reinforcement, investment, load as a reliability resource and a completive price, the price signal is the most effective way to incentive the market participants to maintain system reliability.It surveys the typical transmission pricing methods and especially discusses the model of Grid Embedded Marginal Cost (GEMC) transmission pricing method proposed by professor YanMaoSong, which reflects an effective economic signal to the markets participants and is favor to return the investment costs. The GEMC is a method, which fits the requirement of transmission pricing in developing country, but some times the optimal model is not solvable.Based on the GEMC, this thesis proposed a new transmission pricing methods including costs associated with system reliability. By introducing a fictitious generation in the model, the method can solve the problem in the GEMC above and gives a rational way to load curtailment. The reliability worth is directly considered on the same economic basis as one of transmission costs. By introducing the concept of Customer Quality Index, the customer's selection to the reliability can be reflected in the method.Based on the ability to fulfill the transaction under certain market mechanism, a TTREM (Transaction based Transmission Reliability Evaluation Model) has beendeveloped for accurate assessment of reliability of transmission in the market environment. The traditional model for performance analysis (AC or DC power flow coupled with a remedial actions algorithm) is substituted for the proposed transaction model.All the models are verified with examples and satisfactory results have been obtained. A practical usage is in prospect.