Feeder line loop closing impact current calculation method based on clock synchronization data matrix
A technology of inrush current and clock synchronization, which is applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve the problems that the steady-state current of the ring closure and the inrush current can not be accurately and synchronously calculated, and the synchronization cannot be guaranteed, etc. The method is simple Practical, the effect of improving calculation accuracy
Inactive Publication Date: 2014-04-30
STATE GRID CORP OF CHINA +4
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Problems solved by technology
When monitoring the dispatching automation system, the synchronization of the monitoring results of the two networks cannot be guaranteed, and thus the accurate synchronization calculation of the loop-closing steady-state current and inrush current cannot be guaranteed
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[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0023] Such as figure 1 As shown, the specific steps of using the method proposed in the present invention to calculate the impact current of the distribution network feeder loop closure are as follows:
[0024] Step 1: Take the loop-closing point as the origin, search the transmission network along the feeders on both sides of the loop-closing point according to the topology, and search for the substation bus bars of each voltage level of the feeders on both sides of the loop-closing point, such as 10kV substation and 110kV substation And 220kV substation busbar, etc., determine the position of the boundary node where the feeder on both sides of the loop closure point and the transmission network are handed over.
[0025] exist figure 2 In one example shown, nodes 1 and 2 are different 220kV substations from the transmission grid,...
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The invention discloses a feeder line loop closing impact current calculation method based on a clock synchronization data matrix. The method includes the steps that firstly, a loop closing point serves as an original point, and the position of a boundary node where feeder lines on the two sides of the loop closing point and a power transmission network are connected is determined; a wide range monitoring system is utilized to measure and acquire the clock synchronization data matrix of the boundary node; the voltage amplitude and the voltage phase angle of nodes at the two ends of the loop closing point before loop closing are calculated, and then the voltage difference of the nodes at the two ends of the loop closing point is acquired; a power transmission network equivalent model is built, and then a clock synchronization equivalent impedance matrix is acquired; according to loop impedance and the voltage difference of the nodes at the two ends of the loop closing point, the steady-state current and the impact current of the loop closing point are solved. The method is simple and practical, the clock synchronization characteristic of loop closing operation is reflected, calculation accuracy of the steady-state current and the impact current of the loop closing point is improved, and optimal loop closing operation time can be selected.
Description
technical field [0001] The invention relates to a method for calculating the loop-closing impulse current, in particular to a method for calculating the loop-closing impulse current of a distribution network feeder based on a clock synchronization data matrix, and belongs to the technical field of power system dispatching. Background technique [0002] At present, my country's power distribution network generally adopts the ring network design and the wiring mode of radiation operation. During load reversal or line maintenance, the power outage time can be reduced and the reliability of power supply can be improved through the operation of closing and releasing loops. Among them, load reversal refers to the operation of transferring the load of a line (or transformer) to other lines (or transformers) for power supply. [0003] In the loop closing operation of the distribution network, due to the voltage difference at the loop closing point, the excessive steady-state current...
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IPC IPC(8): H02J3/00
Inventor 施毅斌沈瑜郑建平蒋辰临高习斌许瑨薛晓明祁宁
Owner STATE GRID CORP OF CHINA