A Method of Acquiring Loop Closing Current Based on 10kV Bus Voltage Vector

Abstract

The invention relates to a method for acquiring closed-loop current based on a 10kV bus voltage vector. The method comprises steps of: 1) checking and confirming that the state of a main network of 220 kV and above is accurately estimated, and the parameters of distribution network equipment are accurate; 2) acquiring the voltage and the phase angle of a 220kV bus in a SCADA system; 3) selecting a10kV bus to which two 10kV lines required to be closed belong; 4) checking and confirming that the closed-loop circuit equipment meets a requirement; 5) constructing a three-level voltage reduction distribution network loop closing mode, quantifying a closed-loop circuit network to obtain the impedance value of the quantized closed-loop circuit; 6) closing the loop to obtain the active power andthe reactive power of the power supply path of the 10kV bus, and calculating the voltage and the phase angle of the buses on both sides of the loop point in combination with the impedance of the closed-loop path; 7) according to the voltage and the phase angle of the buses on both sides of the loop point, and the impedance value of the closed-loop circuit, obtaining the closed-loop current. Compared with the prior art, the method is reliable and accurate, and is suitable for all distribution network closed loop modes.

Description

technical field [0001] The invention relates to the technical field of grid power supply, in particular to a method for acquiring loop closing current based on a 10 kV bus voltage vector. Background technique [0002] With the development of grid technology, the scope of grid power supply is constantly expanding. For the current power grid, when the lines belonging to different partitions are merged, the switch will trip due to the influence of circulating current and other conditions. If it is not handled properly, it may cause users to lose power. How to reduce or eliminate the problem of switch tripping during parallel solution has become a key problem that needs to be solved urgently when regulating operation. [0003] It is stipulated in the existing power grid parallel solution rules that when paralleling lines in different partitions, the relevant bus voltage needs to be adjusted (the bus voltage difference is not greater than 0.1 kV), the corresponding partition ope...

AI Technical Summary

Problems solved by technology

However, at present, most of the methods for obtaining bus voltage and phase angle values ​​on both sides of the joint-disconnection loop point are estimation methods, and there is no accurate and effective means to obtain the bus-bar voltage and phase angle on both sides of the joint-disconnection loop point.

In addition, different grid power distribution modes are also the main problem that limits the acquisition of bus voltage and phase angle on both sides of the loop point

Images