A Node Variable Cost Analysis Method in Transmission System Based on Cost Flow of Power Component

This paper presents a method to analyze the net-loss costs of transmission. The power component conception is proposed after analyzing the analytic formula of the power source, transmission power and load power. According to the power definition, each power component in the network is allocated to special source. The power component node cost flow conservation principle is used to analyze the net-loss costs. By tracing the cost flow of each power component, a direct relationship between generation power component and load power component involving net-loss is clearly showed. Then, the load node cost of transmission system can be gotten through weighted averaging the component costs according to the proportion of the power component in load. This method has characteristic clarity of physical conception. At last, the analysis result of IEEE 3 generators and 9 nodes system is present which showed that the method is reasonable and available in practical applications.