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A fast estimiation method of the boundary of 10 kV line head-end load security region

A security domain and boundary technology, applied in the direction of circuit devices, AC network circuits, electrical components, etc., can solve problems such as difficulty in ensuring the integrity and accuracy of load data measurement, and a large number of variables

Active Publication Date: 2018-12-11
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, there are many variables in the actual station area, and it is difficult to guarantee the integrity and accuracy of load data measurement

Method used

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  • A fast estimiation method of the boundary of 10 kV line head-end load security region
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  • A fast estimiation method of the boundary of 10 kV line head-end load security region

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Embodiment Construction

[0019] 1. Voltage drop model of AC line

[0020] Let the model of the AC line L be as figure 1 As shown, the nodes at both ends are i, j, and the voltages at the beginning and end of the line are U i , U j , the voltage phase difference is θ ij , the line impedance is Z L =R L +X L , the impedance angle is α, and the flow direction is from i to j.

[0021] Given the initial and terminal voltage values, according to the line power equation, the corresponding voltage and the initial and terminal power arcs can be obtained, namely

[0022] Head end:

[0023] end:

[0024] That is, as long as the head end or end power is on their respective power arcs, the head and end voltages remain unchanged. It can be seen from formulas (1) and (2) that the center O of the two arcs iL , O jL coordinates, radius r iL 、r jL , the distance h from the center of the circle to the origin iL 、h jL respectively

[0025] Head end:

[0026] end:

[0027] It can be seen from for...

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Abstract

There are many 10 kV lines and the terminal low voltage problem is common. Based on the head-end load safety region, the safety margin of terminal voltage can be mastered according to the head-end load during operation, and it is convenient for line selection and reactive power configuration during planning. A fast estimiation method of that boundary of safety region of head-end load of 10 kV transmission line features that the actual load distribution in the platform area is equivalent to the form of balance distribution along the transmission line plus several heavy load points based on theinfluence analysis of the load distribution characteristics in the platform area on the voltage drop of the transmission line. According to the maximum safe voltage drop of the transmission line, thelinear boundary equations of the load safety region at the head end of the transmission line are derived for various equivalent forms of load distribution. The numerical results show that the terminalvoltage is lower than the safety lower limit value if the head-end load is outside the safety region. Conversely, the terminal voltage is at a safe level. An example is given to illustrate the feasibility of the proposed method. The invention can be widely applied to the safe operation and planning of a 10kV distribution network, and has important engineering application value.

Description

technical field [0001] Distribution network voltage security analysis, distribution network operation domain planning. Background technique [0002] The voltage at the end of the 10 kV line is lower than the safe value, which is a problem often encountered in the current distribution network, which seriously affects the quality of power supply. [0003] At present, the basis for the planning and selection of 10 kV lines is mainly the economic current density, and the basic starting point is to limit the heat generation and line loss of the line. However, the factors affecting the voltage at the end of the line are the length of the line and the load distribution in the station area. Even if the current density is in the normal range, the voltage at the end of the line may not be within the safe range. [0004] Different from transmission lines with higher voltage levels, 10 kV lines are similar to busbars, on which a large number (dozens or even hundreds) of station area tr...

Claims

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Application Information

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IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 竺炜卢家麟
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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