Practical method for calculation of closed-loop impact current of power distribution network based on combination of power transmission network and power distribution network
A technology of inrush current and distribution network, which is applied in the direction of AC network circuits, electrical components, circuit devices, etc., can solve the problems of large influence of inrush current selection and inability to express the time domain characteristics of inrush current, and achieve the effect of simple and convenient method
Inactive Publication Date: 2012-12-19
INTEGRATED ELECTRONICS SYST LAB
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Although this method is simple, the impact current is greatly affected by the selection of engineering factors, and it cannot represent the time-domain characteristics of the impact current
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[0030] Utilize the method proposed in the present invention to carry out the concrete method of calculating the impact current of distribution network closing ring as follows:
[0031] (1) The concepts of public nodes and public node pairs are determined. Relying on the common node pair, an external network equivalent method for connecting the common node branches is determined.
[0032] (2) For the transmission network, since the calculation of the loop-closing impulse current is only related to its loop, the transmission network can be equivalent to an equivalent branch connecting two common nodes. Branch impedance is the self-impedance between two common nodes.
[0033] (3) use N The 6-column common node ring closure information matrix describes the equivalent model of the transmission network loop,
[0034] Specifically:
[0035] (1)
[0036] (4) The first and second columns of the public node ring closure information array describe the names of the public node pa...
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The invention discloses a practical method for calculation of closed-loop impact current of a power distribution network based on a combination of a power transmission network and the power distribution network, which comprises the steps of: providing concepts of a public node and a public node pair; constructing and describing a closed-loop information array of public nodes of an equivalent model of the power distribution network; and establishing a sub-island end node information queue to describe a cross-regional closed-loop state of the public nodes; calculating the amplitude and the phase angle of the voltage at two ends of a closed-loop point of the power distribution network with the closed-loop information array of the public nodes as a basis, in combination with the amplitude and the phase angle of the voltage of the nodes and with each public node as a balancing node, calculating the closed-loop impedance depending on the equivalent impedance of the public nodes, and then calculating the impact current of the closed-loop point. The goal of accurate calculation of the closed-loop impact current in closed-loop operation of the power distribution network can be realized, and the method is simple and convenient and is suitable for actual operating demands of the power distribution network.
Description
technical field [0001] The invention relates to the field of loop closure operation of a distribution network, in particular to a practical method for calculating the impact current of a distribution network loop closure based on the combination of transmission and distribution networks. Background technique [0002] At present, the domestic distribution network mostly adopts the open-loop design and closed-loop power supply mode. When the system fails and is overhauled, it is necessary to realize the load transfer through the operation of closing and breaking the loop to ensure the reliability of power supply. [0003] In order to build a smart distribution network and ensure a safe, high-quality, and reliable power supply during the normal operation of the distribution network, dynamic network reconfiguration will become the future development direction. As the basis of dynamic network reconstruction, ring closing operation will have important practical significance. And...
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IPC IPC(8): H02J3/00
Inventor 张伟冷永杰闫剑锋姚德鹏
Owner INTEGRATED ELECTRONICS SYST LAB