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Improved Algorithm of DC Power Flow Based on Sensitivity Analysis

A technology of sensitivity analysis and DC power flow, applied in the field of DC power flow improvement algorithms, it can solve the problems of loss of balance node information and large branch power flow errors, and achieve the effects of reducing calculation errors, reducing errors, and improving practicability

Active Publication Date: 2021-11-12
STATE GRID HEBEI ELECTRIC POWER CO LTD +1
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  • Abstract
  • Description
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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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  • Improved Algorithm of DC Power Flow Based on Sensitivity Analysis
  • Improved Algorithm of DC Power Flow Based on Sensitivity Analysis
  • Improved Algorithm of DC Power Flow Based on Sensitivity Analysis

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Embodiment 1

[0072] 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 the present embodiment is busbar:

[0073] 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 parameter. The acquisition method is topology analysis well known to those skilled in the art, and will not be repeated here.

[0074] 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 mat...

Embodiment 2

[0121] 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.

[0122] 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.

[0123] Table 1 Network loss sensitivity results of each node in the 30-node system

[0124]

[0125] 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 power flow improvement algorithm based on sensitivity analysis, comprising the following steps: obtaining original data network parameters; establishing branch admittance matrix B L . Calculate the node admittance matrix B according to the formula; establish the network correlation matrix A; screen the nodes whose network loss sensitivity is greater than the threshold, and sum the admittance matrices of the selected nodes, and calculate the average value of the summed matrix ; Compute branch flow. The present invention is mainly proposed for the solution method of the node admittance matrix, adopts the weighted average method based on the network loss sensitivity to replace the conventional order reduction method, and obtains the branch power flow after calculation. This improved scheme makes up for the lost admittance information of the balance node by calculating the average matrix, which not only effectively reduces the calculation error of the DC power flow, but also retains the advantage of rapidity, making the power flow algorithm more efficient than the original algorithm. accurate.

Description

technical field [0001] The invention relates to the technical field of power system power flow calculation, in particular to an improved algorithm of DC power 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 problem...

Claims

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Application Information

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Patent Type & Authority Patents(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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