Research On The Computation And Allocation Of Transmission Cost And System Development

Under the transmission grid opening of power market operation pattern, the transmission grid is the only carrier of electric power transaction and the scarce resource that has cost. The transmission grid companies have right to reclaim the transmission grid cost, and guide the transmission resource participate in the source optimization disposition of the entire social by the correct transmission price signal, and ensure the precise transmission price of each user.The paper introduces the design and realization of the transmission pricing computation system and researches the computation of the transmission cost and its allocation. The issue of the transmission computing is divided into two levels: the analysis and computation of the transmission cost and the allocation of the transmission cost. In order to make the computation and allocation of the transmission cost more convenient, the paper detailedly analyzes the meanings of the transmission cost's constitution and the cost computing, and reorganizes and definies the transmission cost. Transmission cost is formed into fixed cost which includes the amortization fund, the financial expense, the ancillary facilities spend and the management spend, and variable cost which is grid loss charge and additional cost which is extension expense. The paper produces the concrete formula of each cost composition. According to the different types of power transactions, fixed cost is amended before being charged. In the foundation of the thorough research to the meaning of the extension expense, the paper proposes the additional cost be taken as development cost. The additional cost is charged to the new added users and the existing partial users.The transmission cost allocation is always a hotspot in the transmission calculation. The paper discusses the existing methods of the transmission allocation, and contrastively analyzes contract route method, post stamp method, boundary load method, MW-km method, one by one line method, flow tracing method, Long-Run Marginal Cost and Short-Run Marginal Cost and points out the advantage and disadvantage of each method and their suitable application environment. According to the development condition of China power market as well as the suitable environment of each method, the paper points out that the different allocation method should be applied to different transmission cost. The flow tracing method is applied to allocate the fixed cost. The method of marginal loss coefficient is applied to allocate variable costs. The Marginal cost is applied to calculate additional costs.At last, the paper designs the computation system of the transmission cost, combing the modern information technology and technical support systems and basing on the analysis and computation of the transmission cost and its allocation. The paper particularly describes the database design and the function as well as the realization method of the system core module. The system is based on J2EE, offering B/S and C/S application, grounding on the point meter database. A distributed three-layers architecture is applied in the prensent system which has good compatibility and expansibility. The system can be upgraded conveniently to meet the demands of the developing electric market. The successful realization of the system is very important to the power market reform of china.