Line voltage drop torque model based 10kV line voltage quick estimation method

A torque model and line voltage technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve the problem of large amount of calculation, difficult to obtain the dominant factor affecting line voltage drop, difficult to apply 10kV line voltage fast estimation, etc. problem, to achieve the effect of good accuracy, less calculation, and good engineering application value

Active Publication Date: 2018-12-04
竺炜
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AI Technical Summary

Problems solved by technology

Therefore, it is difficult to analyze the voltage at the end of the 10 kV line
The traditional power flow calculation method is based on the nonlinear calculation of line parameters and load complex power, whic

Method used

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  • Line voltage drop torque model based 10kV line voltage quick estimation method
  • Line voltage drop torque model based 10kV line voltage quick estimation method
  • Line voltage drop torque model based 10kV line voltage quick estimation method

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Embodiment Construction

[0015] 1. Corresponding relationship between segmental line voltage drop and terminal load power circle

[0016] Let the nodes at both ends of the segmented AC line L be i, j, and the voltage at both ends be U i , U j , the voltage phase difference is θ ij , the segment line impedance is Z L =R L +X L , the impedance angle is α, and the flow direction is from i to j, such as figure 1 shown. but figure 1 The complex power at the end of the neutral line is

[0017]

[0018]

[0019] According to formulas (1) and (2), the terminal voltage-power relationship can be obtained as

[0020]

[0021] The above formula is the power circle formula, such as figure 2 shown. From formula (3), we can get, figure 2 The center O of the power circle jL coordinates, radius r jL , the distance h from the center of the circle to the origin jL respectively

[0022]

[0023] Therefore, the minimum apparent power S on the arc rj (that is, the minimum distance from the arc...

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Abstract

The number of transformers on a 10kV line is large and the load randomness is high and line voltage quick estimation is difficult. The invention provides a line voltage drop torque model based 10kV line voltage quick estimation method. Based on analysis of correspondence of segmented line voltage drops and power arcs, a dominant factor affecting line voltage drop is obtained and a cross bar torque model for describing 10kV line voltage drop features and a torque method for voltage quick estimation are proposed. According to the invention, based on node positions of the transformers and the minimal apparent power of the load power arcs, equivalent torques of different nodes are obtained; through linear superposition of the equivalent torques of the different nodes, the voltage drop and a tail end voltage value of the line are obtained. The method is small in calculation amount; compared with an example result of a universal program PASAP, the method is good in accuracy of tail end voltage estimation. The method provided by the invention can be widely applied to operation and planning of 10kV distribution networks and is high in engineering application value.

Description

technical field [0001] Power system (grid) security analysis, distribution network planning and operation. Background technique [0002] The 10 kV distribution network is the end of the power grid, and the 10 kV line is often extended with the emergence of new load points. When the load is heavy, it is easy to cause the terminal voltage to exceed the lower limit, and the voltage safety problem is prominent. Therefore, the analysis of the main factors affecting the line voltage drop (that is, the dominant factor) and the rapid estimation of the line terminal voltage have important practical significance for the expansion of the 10 kV line, reactive power configuration, and voltage quality control. [0003] Compared with high-voltage transmission lines, there are a large number of station area transformers (referred to as station area transformers) distributed on 10 kV lines, often dozens or even hundreds, and the station area load is highly random and its characteristics are ...

Claims

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Application Information

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IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 竺炜
Owner 竺炜
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