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A method for quickly estimate that voltage of distribution network station area

A fast and high-voltage technology, applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve problems such as poor low-voltage distribution network, unsuitable data types, etc., achieve less training samples, overcome convergence speed, and high calculation efficiency Effect

Inactive Publication Date: 2019-01-15
ECONOMIC TECH RES INST OF STATE GRID ANHUI ELECTRIC POWER
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  • Application Information

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Problems solved by technology

The existing power flow algorithms are all applied on the basis of clear grid structure and relatively complete operating parameters, and are not suitable for low-voltage distribution networks with poor data types and quality.

Method used

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  • A method for quickly estimate that voltage of distribution network station area
  • A method for quickly estimate that voltage of distribution network station area
  • A method for quickly estimate that voltage of distribution network station area

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Embodiment Construction

[0028] The present invention will be further explained below in conjunction with the drawings:

[0029] S1: Construct a load moment normalized coefficient model and unify the line model:

[0030] The load moment refers to the product of the electrical load and the distance from the power source. Let the power of each load in the load set be P 1 , P 2 ,..., P n , The corresponding coordinate is P 1 (x 1 , Y 1 ), P 2 (x 2 , Y 2 ),..., P n (x n , Y n ), according to the center of gravity moment equation, there are:

[0031] (∑P i )x=∑(P i x i ) (1)

[0032] (∑P i )y=∑(P i y i ) (2)

[0033] Such as figure 1 As shown, the regional load center obtained from the above formula is:

[0034]

[0035]

[0036] According to the concept of load moment, with known line parameters, the line voltage drop can be obtained as:

[0037]

[0038] Where: M = Pl is the load moment; l is the distance from the load to the power point; r 0 , X 0 Respectively, the unit resistance and reactance of the line; Is t...

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Abstract

A method for quickly estimate voltage of distribution network includes unify line type by load moment normalization coefficient, proposing nodal load moment concept, establishing mapping relation between nodal load moment and nodal voltage, and utilize Levenberg- The BP neural network based on Marquardt algorithm achieves the full coverage of voltage estimation under the condition of a small number of training samples. The convergence speed and accuracy are better than the traditional gradient descent algorithm, which has a strong practicability. The invention can provide more accurate voltagecalculation results, and provides powerful support for the staff to master the voltage distribution and the low voltage management of the table area.

Description

Technical field [0001] The invention relates to the technical field of power grid voltage estimation, in particular to a method for quickly estimating the voltage of a distribution network station area. Background technique [0002] With the vigorous advancement of the new round of rural power grid transformation and upgrading projects, the level of rural power grid equipment has been significantly improved, the power supply capacity has been significantly improved, and the potential for rural power consumption can be quickly released, which has greatly promoted the rural economic and social development. However, affected by historical factors, my country’s rural power grids still have the problem of unbalanced and inadequate development. Low voltage often occurs in some areas during peak load periods, which seriously affects the production and living standards of rural residents. [0003] According to the national standard GB / T 12325-2008, the voltage deviation range of 20kV and b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 胡斌马静王绪利叶斌叶彬朱刘柱赵锋代磊杨欣周帆江桂芬尹晨旭
Owner ECONOMIC TECH RES INST OF STATE GRID ANHUI ELECTRIC POWER
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