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DC load flow improvement algorithm based on sensitivity analysis

A technology of sensitivity analysis and DC power flow, applied in the field of DC power flow improvement algorithm based on sensitivity analysis, can solve problems such as loss of balance node information, large power flow error of branches, etc., to reduce calculation errors, reduce errors, and improve practicability Effect

Active Publication Date: 2020-09-18
STATE GRID HEBEI ELECTRIC POWER CO LTD +1
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Problems solved by technology

[0005] However, although the DC power flow model has many advantages, it has some shortcomings after a series of simplifications
In the solution proposed by Dr. Garwell, in order to solve the problem that the node admittance matrix is ​​a singular matrix, the solution adopted is to delete the row and column corresponding to the balanced node. Through the analysis of the simulation results, it can be concluded that this leads to The information of the balance node is lost, which eventually leads to a large error in the power flow of the branch composed of the balance node

Method used

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  • DC load flow improvement algorithm based on sensitivity analysis
  • DC load flow improvement algorithm based on sensitivity analysis
  • DC load flow improvement algorithm based on sensitivity analysis

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Embodiment 1

[0073] This embodiment relates to a DC power flow improvement algorithm based on sensitivity analysis, including the following steps (such as figure 1 shown), wherein, the node in this embodiment is the bus:

[0074] Step 1. Obtain the original data network parameters, including the impedance of each branch, the ground admittance of each branch, the reactance, conductance and susceptance between nodes. These original data network parameters are used to form the admittance matrix in the subsequent steps. Required parameters. The acquisition method is topology analysis well known to those skilled in the art, and will not be repeated here.

[0075] Step 2, using the impedance of each branch and the ground admittance of each branch to establish the branch admittance matrix B of b nodes in the power grid L , Using the reactance between nodes to calculate the node admittance matrix B of n nodes in the grid. Among them, the branch admittance matrix is ​​a b-order diagonal matrix, ...

Embodiment 2

[0122] This embodiment relates to the verification of the DC power flow improvement algorithm based on sensitivity analysis, and this embodiment adopts a system with 30 nodes in IEEE for simulation calculation.

[0123] Step 1, the data is subject to the 30-node network parameters. Node 1 is selected as the balance node in the calculation. The network loss sensitivity of each node in the 30-node system is shown in Table 1. It can be seen from Table 1 that the network loss sensitivity of each node in the 30-node system can be positive or negative. A positive value means that when the node injection power increases, its network loss will also increase; a negative value means that when the node injection power increases, Network loss will be reduced.

[0124] Table 1 Network loss sensitivity results of each node in the 30-node system

[0125]

[0126] From the results in Table 1, an appropriate threshold can be selected according to the specific system. The inverse matrix ...

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Abstract

The invention provides a DC load flow improvement algorithm based on sensitivity analysis. The algorithm comprises the following steps: acquiring original data network parameters; establishing a branch admittance matrix BL, and calculating a node admittance matrix B according to a formula; establishing a network incidence matrix A; screening nodes of which the network loss sensitivity is greater than a threshold value, summing admittance matrixes of the screened nodes, and calculating an average value of the summed matrixes; and calculating branch load flow. The method is mainly provided for asolving method of a node admittance matrix, a weighted average method based on network loss sensitivity is adopted to replace a conventional order reduction method, and then branch load flow is obtained through calculation. According to the improved scheme, the admittance information of the lost balance node is compensated by solving the average matrix, so the calculation error of the DC load flow is effectively reduced, the advantage of rapidity is still kept, and the load flow algorithm is more accurate than the original algorithm.

Description

technical field [0001] The invention relates to the technical field of conductive anticorrosion coatings, in particular to an improved algorithm for direct current flow based on sensitivity analysis. Background technique [0002] Power flow calculation in power system analysis is an important part of power system analysis. In the study of power system operation mode and planning scheme, through the analysis and calculation of power system power flow distribution, the safety and economy of system operation can be further analyzed and evaluated, and improvement measures can be proposed. At the same time, in order to monitor the operating status of the power system in real time, a large number of fast power flow calculations are also required. [0003] Power flow calculation is the basis of power system analysis. According to different solution models, power flow calculation can usually be divided into DC power flow and AC power flow. The traditional power flow calculation pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/06
CPCH02J3/06H02J2203/10H02J2203/20
Inventor 程慧琳黄朝晖高波武剑张晶刘保安刘卉陈进红梁峰陈子来甄晓晨李吉昌米超李晶蒋博迟铖高启明刘献超
Owner STATE GRID HEBEI ELECTRIC POWER CO LTD
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