Determination Of Transmission Facility Usage

With the market reforms of power industry deepening, power generation,transmission and distribution have become independent economic entities underelectricity market environment. Transmission, as a special kind of business, providesservices for power plants and electricity distributors. How to determine thetransmission cost of these services is one problem of transmission service needed tobe resolved. The determination of usage-of-transmission-facility is not only the basisof the related charges of network, but also an essential element of the transmissionmanagement.Currently, the calculation method of the usage-of-transmission-facility is basedon flow tracing. The power flow distribution of the system obtained by power flowcalculation or the state estimation is the basis of the method of flow tracing. Theflow tracing method determine the share of the power of transmission users to powerthrough each transmission facility, and with the result the transmission cost share canbe obtained. In recent years, with the applications of the game theory in theelectricity, and its significant advantage in the distribution area, in the usage oftransmission-facility area, some applications of the game theory has been found.Firstly, game theory and its application in the electricity market are analyzed. Inwhich, the Shapley value method has been widely used in the area of limit players,and the Aumann-Shapley value extending the Shapley value to the area of infiniteplayers is very effective to allocation of branch power to each node injection power.In chapter 3, a new method for calculation of the usage-of-transmission-facilitybased on A-S value is presented. The method can calculate out the usage of thetransmission facility of the branch to each node more simply and accurately by thesensitivity of branch power to node power and numerical integration method,considering the average order of the increasing process of each node power. Theresult of numerical example analysis of simple 5-node system and IEEE-14 standardtest system shows that the proposed method of this paper is fair and reasonable , canprovide fast calculation, and can also achieve the balance of power transmissioneffectively. It provides a new idea of the utility calculation of the usage oftransmission-facility. In chapter 4, a new method of using the share of branch power loss to determinethe usage of transmission-facility has also been proposed. The method uses thesensitivity of branch power loss to node injection power to determine the usage oftransmission-facility of each injection power, combined with the concept of averageof A-S value method, and considering the coupling of active power and reactivepower. The usage of transmission capacity and heat capacity has been fully takeninto account, and the problem, caused by inconsistency to first and last end of branchpower, of the usage of transmission-facility has been overcome.In chapter 5, applications of the usage of transmission-facility under a variety oftransaction models have been studied, and the concept that the usage oftransmission-facility of plant power and load power having the same proportion totheir absolute value is proposed. Through the numerical examples, it shows that thecalculation method of the usage of transmission-facility proposed in this paper canbe used effectively in a variety of transaction models.Finally, the main work of this paper is summarized, and further research isproposed.