Fixed Transmission Cost Allocation By Fusing Dependence And Power System Security

At present, many countries are carrying out large-scale reform of the electricity and exploring the road to be heading for electricity markets. With the further reform of electricity industry and deepening of competition, transmission open access(TOA) is becoming increasingly urgent. The deep development of TOA requires that the transmission resources be fairly and un-discriminatorily used by market participants. Therefore, how to allocate the fixed transmission cost is one of the extraordinarily problems in the process of TOA and a basic requirement of fair play in the electricity markets. In this thesis, based on electric circuit and economics theory, the fixed transmission cost allocation problem is thoroughly studied.The overview of electricity market reform and the present research status at home and abroad of transmission pricing methodologies are firstly introduced. Then, the basic principles as well as characteristics and applicability of each method are carefully analyzed and discussed. In addition, some issues that should be paid attention to are analyzed in details.A novel method for allocating fixed transmission cost by fusing dependence and power system security influence of transactions is proposed in an electricity market coexisting with varied transaction modes. Firstly, a basic transaction vector is designed to describe the pool and bilateral transaction uniformly in the electricity markets. The transmission line usage by each transaction which is computed based on imputation components of branch caloric power is defined. Then, the fixed transmission cost is decomposed into two portions including dependence cost and security cost according to the grid dependence and security influence of each transaction respectively. Where dependence cost is allocated by Pro Rata and security cost is allocated according to line thermal capacity usage of each transaction. The proposed method considers the coupling between active and reactive powers. It is applicable for arbitrary configurations of transmission networks. Simulations results of the IEEE14-bus system show that the proposed method not only satisfies the physical features of network, but also can provide effective economic incentives to each transaction.