Node Transmission Cost Analysis Of Power System Based On Power Dependency Trace

In the power market, the function of transmission service is not only limited in satisfying the user's the power demand, but also clearly defining transmission service and the user's right and cost of using transmission system. It requires justice to provide the transmission service to market participant and reasonable locate the transmission cost. This dissertation proposed the power component cost flow conservation principle as the fundamental of transmission cost analysis. At the situation of the power flow and generator's on-grid price is given, the power component is regard as the carrier of cost, the unit cost of load node is regard as the flowing result of power component cost flow. The conservation of power component cost flow in transmission node and element indicates the income & expenses balance and the cost variety caused by net-loss.This dissertation presents a node transmission cost analysis method based on the analysis of power dependency. At first, this method adopts the power component theory as the physical theory base of the method to solve the source dependency problem of branch power in electric network at physical view. Next, the analytical and computation module of the source's unit power cost at network's each node is gotten by adopting node cost flow conservation principle as economic fundamental. At last, the unit power cost of any node in the network is educed according to each source's node unit power cost and each source's power proportion weighted mean at different nodes. This method is clear in physical idea, it can directly conclude the intuitionist expression of each node's unit power cost in network and source's purchase price considered net-loss in the situation of the power flow and generator's on-grid price is given. It suits for the instance of different sources having different purchase price. At also, the load-power source dependency trace model is educed according to power component theory, combined the power component cost flow conservation the relationship considered net-loss between source node power unit purchase cost and load node power sell price consider is gotten at the situation of the power flow and load node sell price is given.Network equivalence problem is a classical physical problem, but at present there isn't detail theoretical result of its influence to the distribution of transmission cost when physical flow and network economic distribution are combined together as market development. Whether the transmission and distribution cost of the power network vary or net after the network equivalence is a new problem of power market research. This dissertation gives the equivalent network's power distribution characteristic analytic expression before or after equivalence, and educes the condition of node unit power cost invariability in the equivalent network before or after equivalence by using power component theory and cost flow conservation principle and using mathematics equivalence method. Finally there is a conclusion that network equivalent compute can lead to the variation of the equivalent network's transmission cost in general instance.In initial stage of our country's power market, the purchaser didn't enter the market, terminal sell price unloosen, while in sizeable proportion need long-time, middle-time, short-time contract to complete trade in market, above load node transmission cost analysis and purchase node purchase cost analysis method are propitious for market manage organization to analyze and master each node's cost balance. By the research on the network equivalence's influence to the distribution of transmission cost distribution, this paper establishs a base to the distribution network economic cost analysis after our country's power market's next reformation, that is, transmission and distribution are disjoined.