Analysis On Characteristics Of The Power Transmission In Active Distribution Network

With the increasing penetration of distributed energy in the distribution network, the safe and stable operation of the distribution network is affected, in order to solve this problem, the concept of active distribution network came into being. Active distribution network can run stably and economically through the coordination of power, load power and network power loss.Clearing the power transmission characteristics among power, load power and network power loss is the basis of the active distribution network management. Due to the the existence of distributed energy, active distribution network presents the characteristics of power coupling,therefore, paper firstly selects a power tracing method conforming to the law of circuit to decouple multiple power supply network, geting the single-supply network, and describes the power flow of single power supply in the network analytically based on the impedance and admittance conjugate combination, and gives the block diagram and the signal flow graph representation; Secondly, analyzes power transmission relationship of the power supply in the same branch and node from the perspective of the impedance matching, and guarantees the independence of each power supply network synthesis results consistent with the original network; Then, based on the related concepts of signal flow graph, power transmission expression between the source and load, source and network, source and source in the active distribution network is established; Finally, with IEEE 33 nodes distribution network as an example, the power transfer process in the active distribution network is described, and the change process of the power transmission in the network is analyzed from the angle of the impedance when the power of distributed power supply permeability increasing.