| As the key-ligament between the customer and the generation & transmission system, distribution system plays a very important role in ensuring the continuous power supply for customers in safety and in high reliability. Therefore, the scientific evaluation on the power supply capability of urban distribution network is of enormous social and economical significance. Based on the model and method are proposed in essay 25, the theory of power supply capability in distribution system is developed and improved in this paper.Firstly, using total transfer capability of transmission network for reference, the Total Supply Capability (TSC) is defined. Moreover, a new model and method of TSC is proposed. In the new method, the capacity of transfer channel is taken into account, and the approach for load distribution is improved.Secondly, analysis method of connecting element capacity is put forward. In this method, the weak points of the network can be located fast with the channel bottleneck matrix, the minimum capacity of transfer channel is provided by critical capacity matrix, which can guide component selection.Thirdly, based on the analysis of TSC, a method for connection planning in distribution system is presented, which can provide an optimal connection-building scheme automatically. Meanwhile, some indexes of grid are analyzed such as the connection scale of transformers, proportionality of connection and the principle of connection building.Finally, take a district network for example, the total supply capability and improvement were analyzed, several suggestions were presented for the District. The TSC method will provide a new powerful tool for urban distribution network planning and construction.
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