CN103530822A - Method for analyzing loss reduction potential of grids of Gansu Province - Google Patents

Abstract

The invention discloses a method for analyzing loss reduction potential of grids of Gansu Province. The method comprises the steps as follows: influence factors of loss of the grids of the Gansu Province are analyzed, and the loss reduction potential of a single influence factor in the influence factors of the loss of the grids of the Gansu Province is analyzed as well; on the basis of the analyzed loss value of the grids of the Gansu Province, the loss reduction rates of measures to single influence factors are calculated respectively; on the basis of the calculated loss reduction rates, the influence factors of the loss of the grids of the Gansu Province are analyzed with variable-weight grey relational analysis method, and the grey correlation degree of a single influence factor to the loss of the grids of the Gansu Province is determined; and according to the determined grey correlation degree, the weight is determined, a comprehensive loss reduction rate formula is acquired with a weighting method, and the loss reduction potential of the grids of the Gansu Province is obtained. According to the method for analyzing the loss reduction potential of the grids of the Gansu Province, defects of large loss of the transmission grid, poor economic benefits, high production cost and the like in the prior art can be overcome, so that the advantages of small loss of the transmission grid, good economic benefits and low production cost are realized.

Description

The Potentials method of damaging falls in a kind of Gansu Power Grid

Technical field

The present invention relates to Energy Saving Technique of Electric Power System field, particularly, relate to a kind of Gansu Power Grid and fall the Potentials method of damaging.

Background technology

Gansu Power Grid is positioned at the center of Northwest Grid, and extension region is long and narrow, and electrical network distance from northwest to the southeast surpasses 1300 kms inside the province.Because the residing geographic position of Gansu Power Grid is special, extensive Power Exchange must be undertaken by Gansu Power Grid frequently, and Gansu Power Grid has been caused to extra transmission losses.And Gansu Power Grid itself has the access of large-scale wind-powered electricity generation, these wind powers are far away apart from load center, cannot on-site elimination, need to send outside at a distance, and this has also increased the active loss on transmission line of electricity.In addition, the electromagnetic looped network that some region of Gansu Power Grid there will be 750kV and 330kV electric pressure to form, thus this can make active power occur that circulation causes the increase of active loss.

The network loss problem of considering Gansu Power Grid is very outstanding, and it is very large to fall damage potentiality, studying on the basis of network loss mechanism of production under the different dispatching running ways of Gansu Power Grid, need to take reasonably to fall damage measure, effectively reduce the network loss of Gansu Power Grid, reduce unnecessary loss in transmission of electricity process, thereby improved the economic benefit of Gansu Power Grid, reduced the production cost of power grid enterprises.

In Gansu Power Grid, the damage analysis of falling of each several part has had certain research and has obtained a part of application at present, but its research purpose all mainly concentrates on for falling of single factor and damages and analyze, as improve transmission voltage grade to reduce the active loss of transmission line of electricity, adopt ULTC to reduce the active loss of transformer, the aspects such as loss that the grid structure of optimization electrical network causes to reduce power circulation, lack research and damage Potentials method this respect for falling of Gansu Power Grid integral body.

In realizing process of the present invention, the defects such as inventor finds at least to exist in prior art that Transmission Loss is large, deficiency in economic performance and production cost height.

Summary of the invention

The object of the invention is to, for the problems referred to above, propose a kind of Gansu Power Grid and fall damage Potentials method, to realize the advantage that Transmission Loss is little, good in economic efficiency and production cost is low.

For achieving the above object, the technical solution used in the present invention is: a kind of Gansu Power Grid falls and damages Potentials method, comprising:

A, analyze the influence factor of Gansu Power Grid network loss, and analyze single influence factor in the influence factor of Gansu Power Grid network loss damage potentiality fall;

B, based on step a, analyze gained Gansu Power Grid network loss average, calculate respectively and take to fall loss rate δ for single influence factor _i;

C, based on step b, calculate gained and fall loss rate δ _i, use the grey relation analysis method that becomes power, the influence factor of Gansu Power Grid network loss is analyzed, determine the grey degree of association ω of single influence factor on the impact of Gansu Power Grid network loss _i;

D, the grey degree of association ω determining according to step c _isize, determine weight, utilize weighted method to obtain synthetic loss reduction rate formula, what obtain Gansu Power Grid falls damage potentiality.

Further, in step a, the influence factor of described Gansu Power Grid network loss, at least comprises that electric pressure configures the impact of network loss and wind-powered electricity generation are sent to the impact of power on network loss the impact of network loss, reactive-load compensation the impact of network loss, circuit underloading/heavy duty.

Further, in step a, the operation of falling damage potentiality of the single factor of described analysis, comprising:

The impact of analytical voltage grade on network loss, adopts formula:

$\mathrm{\&Delta;}\left(\mathrm{\&Delta;P}\right)=\mathrm{\&Delta;P}(1-\frac{U_1^2}{{\mathrm{<figure-callout\; id="2"\; label="U"\; filenames="131023140210.png,131023140214.png"\; state="\{\{state\}\}">U</figure-callout>}}_2^2})---\left(1\right);$

Wherein, Δ P is the active loss value before boost in voltage, U ₁for electrical network boost before electric pressure, U ₂for electrical network boost after electric pressure; Mainly for 330kV electric pressure and 750kV electric pressure, analyze.

Further, in step a, the operation of falling damage potentiality of the single factor of described analysis, also comprises:

Analyze the impact of reactive-load compensation configuration on network loss, adopt formula:

Wherein,

for original power factor,

for the power factor after improving.

Further, in step a, the operation of falling damage potentiality of the single factor of described analysis, also comprises:

Analyze wind-powered electricity generation and send the impact of power on network loss, for the transmission system of a n node, adopt formula:

$\mathrm{\&Delta;P}=\underset{i=0}{\overset{n-1}{\mathrm{\&Sigma;}}}[{(\underset{j=i+1}{\overset{n}{\mathrm{\&Sigma;}}}\frac{P_j}{V_j}-\frac{P_{\mathrm{WF}}}{V_n})}^2+{(\underset{j=i+1}{\overset{n}{\mathrm{\&Sigma;}}}\frac{Q_j}{V_j}+\frac{Q_{\mathrm{WF}}}{V_n})}^2]R_{i,i+1}---\left(3\right);$

Wherein, meritorious, idle the exerting oneself of wind energy turbine set are respectively P _wF, Q _wF, the consumed power of each node of system is respectively P _j, Q _j, the voltage of each node of system is V _j, j ∈ [1, n].

Further, in step a, the operation of falling damage potentiality of the single factor of described analysis, also comprises:

The impact of analysis circuit underloading/heavy duty on network loss, adopts tracing analysis, utilizes simulation result to make the curve of circuit head end size of current to network loss, obtains the affect trend of circuit transmission power on network loss.

Further, in step b, calculate and to take to fall loss rate δ for single influence factor _ioperation, comprising:

Calculating is fallen loss rate and is adopted formula:

${\mathrm{\&delta;}}_i=\frac{{\mathrm{\&Delta;P}}_0-{\mathrm{\&Delta;P}}_1}{P}*100\%---\left(4\right);$

Wherein, Δ P ₀represent not grid net loss value Ex ante, Δ P ₁represent to take the grid net loss value after certain measure, P is meritorious gross generation.

Further, in step c, described utilization becomes the grey relation analysis method of power, and the operation that the influence factor of Gansu Power Grid network loss is analyzed, specifically comprises:

Calculate the grey relation analysis method that becomes power, adopt formula

the grey degree of association of certain network loss influence factor after definite consideration weight;

Wherein, ω _ijfor not considering the grey degree of association of weight; W _iassociated flexible strategy for factor i: wherein

u _ikfor the variation order relation of line loss and added influence being determined to the element in factor of evaluation collection U with each network loss factor; Arbitrary factor X _iwith Y ₀grey correlation coefficient be:

${\mathrm{\&omega;}}_{\mathrm{ij}}=\frac{\left(\underset{i}{\min }\underset{j}{\min }\right|Y_0^{*}\left(j\right)-X_i^{*}\left(j\right)|+\mathrm{\&zeta;}\max \max |Y_0^{*}\left(j\right)-X_i^{*}\left(j\right)\left|\right)}{\left(\right|Y_0^{*}\left(j\right)-X_i^{*}\left(j\right)\left|\mathrm{\&zeta;}\max \max \right|Y_0^{*}\left(j\right)-X_i^{*}\left(j\right)\left|\right)}.$

Further, in steps d, that utilizes that weighted method calculates Gansu Power Grid falls damage potentiality, adopts formula:

$\mathrm{\&delta;}=\underset{j=1}{\overset{n}{\mathrm{\&Sigma;}}}{\mathrm{\&alpha;}}_j{\mathrm{\&delta;}}_j---\left(6\right);$

Wherein, α _jfor the weight coefficient of the grey degree of association equivalence of certain network loss impact,

δ is that damage potentiality fall in Gansu Power Grid, by the actual value of falling loss rate of certain factor and the weight of this factor that obtain, can access falling of Gansu Power Grid and damage potentiality δ.

The Gansu Power Grid of various embodiments of the present invention falls and damages Potentials method, owing to comprising: analyze the influence factor of Gansu Power Grid network loss, and analyze single influence factor in the influence factor of Gansu Power Grid network loss damage potentiality fall; Based on analyzing gained Gansu Power Grid network loss average, calculating respectively, take to fall loss rate δ for single influence factor _i; Based on calculating gained, loss rate δ falls _i, use the grey relation analysis method that becomes power, the influence factor of Gansu Power Grid network loss is analyzed, determine the grey degree of association ω of single influence factor on the impact of Gansu Power Grid network loss _i; According to the grey degree of association ω determining _isize, determine weight, utilize weighted method to obtain synthetic loss reduction rate formula, what obtain Gansu Power Grid falls damage potentiality; Can guarantee that Gansu Power Grid, on the basis of assurance safety and stability, can operate under most economical condition, improve the transfer efficiency of electrical network; Thereby can overcome in prior art that Transmission Loss is large, deficiency in economic performance and the high defect of production cost, to realize the advantage that Transmission Loss is little, good in economic efficiency and production cost is low.

Other features and advantages of the present invention will be set forth in the following description, and, partly from instructions, become apparent, or understand by implementing the present invention.

Below by drawings and Examples, technical scheme of the present invention is described in further detail.

Accompanying drawing explanation

Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for instructions, for explaining the present invention, is not construed as limiting the invention together with embodiments of the present invention.In the accompanying drawings:

Fig. 1 is that the schematic flow sheet that damages Potentials method falls in Gansu Power Grid of the present invention;

Fig. 2 is that the electric network wiring scheme that damages Potentials embodiment of the method falls in Gansu Power Grid of the present invention.

Embodiment

Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein, only for description and interpretation the present invention, is not intended to limit the present invention.

According to the embodiment of the present invention, as depicted in figs. 1 and 2, provide a kind of Gansu Power Grid to fall to damage Potentials method, for analyzing Gansu Power Grid, be in operation and fall measure that damage takes and have how much to fall and damage space for realizing.

The Gansu Power Grid of the present embodiment falls and damages Potentials method, comprising:

Step 1: analyze the influence factor of Gansu Power Grid network loss, and analyze single factor (being the influence factor of Gansu Power Grid network loss) damage potentiality fall;

In step 1, the influence factor of Gansu Power Grid network loss, specifically comprises that electric pressure sends power on the impact of network loss etc. on the impact of network loss, reactive-load compensation configuration to the impact of network loss and wind-powered electricity generation on the impact of network loss, circuit underloading/heavy duty;

In step 1, analyze the operation of damaging potentiality of falling of single factor, comprising:

The impact of analytical voltage grade on network loss, adopts formula:

$\mathrm{\&Delta;}\left(\mathrm{\&Delta;P}\right)=\mathrm{\&Delta;P}(1-\frac{U_1^2}{{\mathrm{<figure-callout\; id="2"\; label="U"\; filenames="131023140210.png,131023140214.png"\; state="\{\{state\}\}">U</figure-callout>}}_2^2})---\left(1\right);$

Wherein, Δ P is the active loss value before boost in voltage, U ₁for electrical network boost before electric pressure, U ₂for electrical network boost after electric pressure; Mainly for 330kV electric pressure and 750kV electric pressure, analyze;

In step 1, analyze the operation of damaging potentiality of falling of single factor, also comprise:

Analyze the impact of reactive-load compensation configuration on network loss, adopt formula:

Wherein,

for original power factor,

for the power factor after improving;

In step 1, analyze the operation of damaging potentiality of falling of single factor, also comprise:

Analyze wind-powered electricity generation and send the impact of power on network loss, for the transmission system of a n node, adopt formula:

$\mathrm{\&Delta;P}=\underset{i=0}{\overset{n-1}{\mathrm{\&Sigma;}}}[{(\underset{j=i+1}{\overset{n}{\mathrm{\&Sigma;}}}\frac{P_j}{V_j}-\frac{P_{\mathrm{WF}}}{V_n})}^2+{(\underset{j=i+1}{\overset{n}{\mathrm{\&Sigma;}}}\frac{Q_j}{V_j}+\frac{Q_{\mathrm{WF}}}{V_n})}^2]R_{i,i+1}---\left(3\right);$

Wherein, meritorious, idle the exerting oneself of wind energy turbine set are respectively P _wF, Q _wF, the consumed power of each node of system is respectively P _j, Q _j, the voltage of each node of system is V _j, j ∈ [1, n];

When each factor changes above, the respective change value of network loss all can be carried out off-line trend by Based on Power System Analysis Software Package (PSASP) and calculated; In addition, the impact for circuit underloading/heavy duty on network loss, can adopt tracing analysis, utilizes simulation result to make the curve of circuit head end size of current to network loss, thereby obtains the affect trend of circuit transmission power on network loss;

Step 2: calculate respectively and take to fall loss rate δ for single influence factor _i;

In step 2, calculate and to take to fall loss rate δ for single influence factor _ioperation, comprising:

Calculating is fallen loss rate and is adopted formula:

${\mathrm{\&delta;}}_i=\frac{{\mathrm{\&Delta;P}}_0-{\mathrm{\&Delta;P}}_1}{P}*100\%---\left(4\right);$

Wherein, Δ P ₀represent not grid net loss value Ex ante, Δ P ₁represent to take the grid net loss value after certain measure, P is meritorious gross generation; Calculating is fallen the required network loss value of loss rate by being obtained through calculated off-line by Based on Power System Analysis Software Package (PSASP) in step 1;

Step 3: use the grey relation analysis method that becomes power, the influence factor of Gansu Power Grid network loss is analyzed, determine the grey degree of association ω of single influence factor (being the influence factor of Gansu Power Grid network loss) on the impact of Gansu Power Grid network loss _i;

In step 3, calculate the grey correlating method employing formula that becomes power

the grey degree of association of certain network loss influence factor after definite consideration weight;

Wherein, ω _ijfor not considering the grey degree of association of weight; W _iassociated flexible strategy for factor i:

wherein

u _ikfor the variation order relation of line loss and added influence being determined to the element in factor of evaluation collection U with each network loss factor; Arbitrary factor X _iwith Y ₀grey correlation coefficient be:

${\mathrm{\&omega;}}_{\mathrm{ij}}=\frac{\left(\underset{i}{\min }\underset{j}{\min }\right|Y_0^{*}\left(j\right)-X_i^{*}\left(j\right)|+\mathrm{\&zeta;}\max \max |Y_0^{*}\left(j\right)-X_i^{*}\left(j\right)\left|\right)}{\left(\right|Y_0^{*}\left(j\right)-X_i^{*}\left(j\right)\left|\mathrm{\&zeta;}\max \max \right|Y_0^{*}\left(j\right)-X_i^{*}\left(j\right)\left|\right)};$

Particularly, in step 3, calculate the operation of the grey correlating method that becomes power, further comprise:

Ash correlating method, gets historical statistics Network Loss Rate and forms target sequence Y ₀, get corresponding each factor index and form factor sequence X _i, set up corresponding matrix $\left[\begin{array}{c}{Y}_0\\ X_1\\ \&CenterDot;\\ \&CenterDot;\\ \&CenterDot;\\ X_i\end{array}\right]=\left[\begin{array}{cccc}{Y}_0\left(1\right)& Y_0\left(2\right)& \&CenterDot;\&CenterDot;\&CenterDot;& Y_0\left(j\right)\\ X_1\left(1\right)& X_1\left(2\right)& \&CenterDot;\&CenterDot;\&CenterDot;& X_1\left(j\right)\\ \&CenterDot;& \&CenterDot;& \&CenterDot;& \&CenterDot;\\ \&CenterDot;& \&CenterDot;& \&CenterDot;& \&CenterDot;\\ \&CenterDot;& \&CenterDot;& \&CenterDot;& \&CenterDot;\\ X_i\left(1\right)& X_i\left(2\right)& \&CenterDot;\&CenterDot;\&CenterDot;& X_i\left(j\right)\end{array}\right],$ Ask for grey correlation coefficient and adopt formula:

${\mathrm{\&omega;}}_{\mathrm{ij}}=\frac{\left(\underset{i}{\min }\underset{j}{\min }\right|Y_0^{*}\left(j\right)-X_i^{*}\left(j\right)|+\mathrm{\&zeta;}\max \max |Y_0^{*}\left(j\right)-X_i^{*}\left(j\right)\left|\right)}{\left(\right|Y_0^{*}\left(j\right)-X_i^{*}\left(j\right)\left|\mathrm{\&zeta;}\max \max \right|Y_0^{*}\left(j\right)-X_i^{*}\left(j\right)\left|\right)}---\left(5\right);$

Wherein, calculate arbitrary factor X _iwith Y ₀grey correlation coefficient, ζ gets 0.5;

$Y_0^{*}=\{1,\frac{Y_0\left(2\right)}{Y_0\left(1\right)},\&CenterDot;\&CenterDot;\&CenterDot;,\frac{Y_0\left(j\right)}{Y_0\left(1\right)}\}$

$X_i^{*}=\{1,\frac{X_i\left(2\right)}{X_i\left(1\right)},\&CenterDot;\&CenterDot;\&CenterDot;,\frac{X_i\left(j\right)}{X_i\left(1\right)}\},$ X _iwith Y ₀positive correlation

$X_i^{*}=\{1,\frac{c_i-X_i\left(2\right)}{c_i-X_i\left(1\right)},\&CenterDot;\&CenterDot;\&CenterDot;,\frac{c_i-X_i\left(j\right)}{c_i-X_i\left(1\right)}\},$ X _iwith Y ₀negative correlation;

Become the grey correlating method of power, adopt formula

the grey degree of association of certain network loss influence factor after definite consideration weight; ω wherein _ijfor not considering the grey degree of association of weight, W _ifor the associated flexible strategy of factor i,

wherein

u _ikfor the variation order relation of line loss and added influence being determined to the element in factor of evaluation collection U with each network loss factor;

Step 4: according to grey degree of association size, determine weight, utilize weighted method to obtain synthetic loss reduction rate formula, thereby obtain Gansu Power Grid damage potentiality fall;

In step 4, that utilizes that weighted method calculates Gansu Power Grid falls damage potentiality, adopts formula:

$\mathrm{\&delta;}=\underset{j=1}{\overset{n}{\mathrm{\&Sigma;}}}{\mathrm{\&alpha;}}_j{\mathrm{\&delta;}}_j---\left(6\right);$

Wherein, α _jfor the weight coefficient of the grey degree of association equivalence of certain network loss impact,

δ is that damage potentiality fall in Gansu Power Grid, by the actual value of falling loss rate of certain factor and the weight of this factor that obtain, can access falling of Gansu Power Grid and damage potentiality δ.

hexi Region of Gansu electrical network in 2013 using below as one embodiment of the present of invention, sweet to above-described embodiment respectful electrical network falls damage Potentials method and is further described.

Hexi Region of Gansu electric network wiring scheme as shown in Figure 2., summer large packet large according to the winter in Gansu Power Grid 2013 yearly operation modes utilizes Based on Power System Analysis Software Package (PSASP) to calculate, wherein, Network Loss Rate under the large method of operation of summer in 2013 is 1.31%, and the Network Loss Rate under the large method of operation of winter is 1.27%.Mainly consider in an embodiment the active loss of 750kV and two electric pressure circuits of 330kV.Consider the impact of following factor on network loss: X ₁the impact of the change (trend shifts to the transmission line of electricity of voltage levels, is equivalent to the raising of covert electric pressure) distributing for trend on network loss; X ₂for wind-powered electricity generation is sent the impact of scale on network loss; X ₃impact on network loss while changing (being that power factor changes) for reactive-load compensation.

Guaranteeing under the rational condition of system load flow, what only change that single factors uses that Based on Power System Analysis Software Package (PSASP) calculates that single factors causes falls loss rate δ _j;

Factor	Loss rate (%) is fallen
		X 1	0.31
X 2	0.17
		X 3	0.22

Table 1: single factors loss rate table falls

Adopt and become weighted gray correlation analysis, obtain the grey degree of association of each factor on network loss impact, be converted into each factor and consider that the grey degree of association is α on the weight proportion of network loss impact ₁=0.45, α ₂=0.3, α ₃=0.25, substitution

obtain Hexi Region of Gansu electrical network at synthetic loss reduction rate δ=0.2455% of considering these three factors.

In sum, the Gansu Power Grid of the various embodiments described above of the present invention falls and damages Potentials method, is particularly useful for Gansu province, comprising: analyze the influence factor of Gansu Power Grid network loss, and analyze single factor damage potentiality fall; Calculate and take the loss rate of falling for single influence factor respectively; Use the grey relation analysis method that becomes power to analyze affecting the factor of Gansu Power Grid network loss, determine the grey degree of association of single influence factor on the impact of Gansu network loss; According to grey degree of association size, determine weight, utilize weighted method to obtain synthetic loss reduction rate formula, thus obtain Gansu Power Grid damage potentiality fall.This Gansu Power Grid falls and damages Potentials method, has guaranteed that Gansu Power Grid, on the basis of assurance safety and stability, can operate under most economical condition, has improved the transfer efficiency of electrical network.

Finally it should be noted that: the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although the present invention is had been described in detail with reference to previous embodiment, for a person skilled in the art, its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (9)

1. Gansu Power Grid falls and damages a Potentials method, it is characterized in that, comprising:

A, analyze the influence factor of Gansu Power Grid network loss, and analyze single influence factor in the influence factor of Gansu Power Grid network loss damage potentiality fall;

B, based on step a, analyze gained Gansu Power Grid network loss average, calculate respectively and take to fall loss rate δ for single influence factor _i;

C, based on step b, calculate gained and fall loss rate δ _i, use the grey relation analysis method that becomes power, the influence factor of Gansu Power Grid network loss is analyzed, determine the grey degree of association ω of single influence factor on the impact of Gansu Power Grid network loss _i;

D, the grey degree of association ω determining according to step c _isize, determine weight, utilize weighted method to obtain synthetic loss reduction rate formula, what obtain Gansu Power Grid falls damage potentiality.

2. the Potentials method of damaging falls in Gansu Power Grid according to claim 1, it is characterized in that, in step a, the influence factor of described Gansu Power Grid network loss, at least comprises that electric pressure configures the impact of network loss and wind-powered electricity generation are sent to the impact of power on network loss the impact of network loss, reactive-load compensation the impact of network loss, circuit underloading/heavy duty.

3. Gansu Power Grid according to claim 1 and 2 falls and damages Potentials method, it is characterized in that, in step a, the operation of falling damage potentiality of the single factor of described analysis, comprising:

The impact of analytical voltage grade on network loss, adopts formula:

$\mathrm{\&Delta;}\left(\mathrm{\&Delta;P}\right)=\mathrm{\&Delta;P}(1-\frac{U_1^2}{U_2^2})---\left(1\right);$

Wherein, Δ P is the active loss value before boost in voltage, U ₁for electrical network boost before electric pressure, U ₂for electrical network boost after electric pressure; Mainly for 330kV electric pressure and 750kV electric pressure, analyze.

4. Gansu Power Grid according to claim 1 and 2 falls and damages Potentials method, it is characterized in that, in step a, the operation of falling damage potentiality of the single factor of described analysis, also comprises:

Analyze the impact of reactive-load compensation configuration on network loss, adopt formula:

Wherein,

for original power factor,

for the power factor after improving.

5. Gansu Power Grid according to claim 1 and 2 falls and damages Potentials method, it is characterized in that, in step a, the operation of falling damage potentiality of the single factor of described analysis, also comprises:

Analyze wind-powered electricity generation and send the impact of power on network loss, for the transmission system of a n node, adopt formula:

$\mathrm{\&Delta;P}=\underset{i=0}{\overset{n-1}{\mathrm{\&Sigma;}}}[{(\underset{j=i+1}{\overset{n}{\mathrm{\&Sigma;}}}\frac{P_j}{V_j}-\frac{P_{\mathrm{WF}}}{V_n})}^2+{(\underset{j=i+1}{\overset{n}{\mathrm{\&Sigma;}}}\frac{Q_j}{V_j}+\frac{Q_{\mathrm{WF}}}{V_n})}^2]R_{i,i+1}---\left(3\right);$

Wherein, meritorious, idle the exerting oneself of wind energy turbine set are respectively P _wF, Q _wF, the consumed power of each node of system is respectively P _j, Q _j, the voltage of each node of system is V _j, j ∈ [1, n].

6. Gansu Power Grid according to claim 1 and 2 falls and damages Potentials method, it is characterized in that, in step a, the operation of falling damage potentiality of the single factor of described analysis, also comprises:

The impact of analysis circuit underloading/heavy duty on network loss, adopts tracing analysis, utilizes simulation result to make the curve of circuit head end size of current to network loss, obtains the affect trend of circuit transmission power on network loss.

7. Gansu Power Grid according to claim 1 falls and damages Potentials method, it is characterized in that, in step b, calculates and takes to fall loss rate δ for single influence factor _ioperation, comprising:

Calculating is fallen loss rate and is adopted formula:

${\mathrm{\&delta;}}_i=\frac{{\mathrm{\&Delta;P}}_0-{\mathrm{\&Delta;P}}_1}{P}*100\%---\left(4\right);$

Wherein, Δ P ₀represent not grid net loss value Ex ante, Δ P ₁represent to take the grid net loss value after certain measure, P is meritorious gross generation.

8. Gansu Power Grid according to claim 1 falls and damages Potentials method, it is characterized in that, in step c, described utilization becomes the grey relation analysis method of power, and the operation that the influence factor of Gansu Power Grid network loss is analyzed, specifically comprises:

Calculate the grey relation analysis method that becomes power, adopt formula

the grey degree of association of certain network loss influence factor after definite consideration weight;

Wherein, ω _ijfor not considering the grey degree of association of weight; W _iassociated flexible strategy for factor i:

wherein

u _ikfor the variation order relation of line loss and added influence being determined to the element in factor of evaluation collection U with each network loss factor; Arbitrary factor X _iwith Y ₀grey correlation coefficient be:

${\mathrm{\&omega;}}_{\mathrm{ij}}=\frac{\left(\underset{i}{\min }\underset{j}{\min }\right|Y_0^{*}\left(j\right)-X_i^{*}\left(j\right)|+\mathrm{\&zeta;}\max \max |Y_0^{*}\left(j\right)-X_i^{*}\left(j\right)\left|\right)}{\left(\right|Y_0^{*}\left(j\right)-X_i^{*}\left(j\right)\left|\mathrm{\&zeta;}\max \max \right|Y_0^{*}\left(j\right)-X_i^{*}\left(j\right)\left|\right)}.$

9. Gansu Power Grid according to claim 1 falls and damages Potentials method, it is characterized in that, in steps d, that utilizes that weighted method calculates Gansu Power Grid falls damage potentiality, adopts formula:

$\mathrm{\&delta;}=\underset{j=1}{\overset{n}{\mathrm{\&Sigma;}}}{\mathrm{\&alpha;}}_j{\mathrm{\&delta;}}_j$

Wherein, α _jfor the weight coefficient of the grey degree of association equivalence of certain network loss impact, damage potentiality fall in Gansu Power Grid, by the actual value of falling loss rate of certain factor and the weight of this factor that obtain, can access falling of Gansu Power Grid and damage potentiality δ.

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