CN103823968A - Performance evaluation method suitable for multi-region interconnected power grid contact line power control - Google Patents

Abstract

The invention discloses a performance evaluation method suitable for multi-region interconnected power grid contact line power control. The performance evaluation method includes for any regional power grid interconnected through a certain extra-high voltage contact line, decomposing to be an N-region tree-shaped structure interconnected power grid model, and acquiring responsibility, for power fluctuation of any contact line, of any control region by analyzing influence, of each control region, on power fluctuation on the contact lines when power disturbance occurs at a certain place of the interconnected power grid; after control targes of all contact lines of the interconnected power grid are determined, acquiring control responsibility, of a certain control region in the interconnected power grid, on the contact lines, and calculating T1 and T2 indexes used for contact line control evaluation according to the control responsibility for evaluation. By the performance evaluation method, responsibility, which should be taken from and contribution, which should be made to, power fluctuation of the contact lines, of each control region can be effectively distinguished, and an evaluation method for reasonably evaluating control performance of each region can be formulated. The performance evaluation method has good application prospect.

Description

A kind of method of evaluating performance that adapts to the control of multi area interconnection interconnecting ties power

Technical field

The invention belongs to field of power system control, be specifically related to a kind of method of evaluating performance that adapts to the control of multi area interconnection interconnecting ties power.

Background technology

The generating occurring Anywhere in interconnected network and the meritorious disturbance of load all can exert an influence to interconnection transmission power, and power swing is relevant with factors such as the net capacity at interconnection two ends and frequency characteristics.The planning of following China electrical network is to develop Ning Mei electricity base, Jin, Shaanxi and Inner Mongolia and southwestern hydroelectric development as opportunity, on the basis of the 1000kV communication channel that takes the lead in building running due north and due south in North China and Central China Power Grid, again North China-Central China synchronised grids is connected with East China Power Grid by extra-high-voltage alternating current, forms the extra-high voltage synchronised grids that connects Ning Mei electricity base, Jin, Shaanxi and Inner Mongolia, southwestern Hydropower Base and North China, Central China, East China load center.Therefore, there is larger variation in electric network composition and operation characteristic, research effectively suppresses the power control strategy of multi area interconnection electrical network extra-high voltage interconnection fluctuation, formulation can the each Region control performance of rational evaluation evaluation method, be the new problem that following " three China " interconnected network management and running face.

In order to improve the control effect of " three China " extra-high voltage interconnected network interconnection tie power fluctuation, need to study a set of control performance evaluation index adapting with it, domestic scholars has proposed interconnection power control performance evaluation criterion, and be referred to as T(Tie-line) standard, comprise T1 standard and T2 standard, in this standard, propose take extra-high voltage interconnection power as controlling the Performance Evaluating Indexes (being referred to as " responsibility degree ") of target, can effective evaluation North China, two control zones, Central China responsibility that extra-high voltage interconnection tie power fluctuation be should bear and the contribution of doing.But the prerequisite of this standard formulation is using two region interconnected networks as research object, after " three China " Power System Interconnection, do not there is applicability, control method and each Region control method of evaluating performance of research multi area interconnection electrical network extra-high voltage interconnection tie power fluctuation, for frequency security and the power stability control of following " three China " electrical network, have important practical significance.

Summary of the invention

In order to solve traditional interconnection power control performance evaluation criterion, can only be using two region interconnected networks as research object, after " three China " Power System Interconnection, do not there is applicability, suppress the power control strategy of research multi area interconnection electrical network extra-high voltage interconnection fluctuation, cannot formulate the problem of the evaluation method of the each Region control performance of rational evaluation.

In order to address the above problem, the technical solution adopted in the present invention is:

A method of evaluating performance that adapts to the control of multi area interconnection interconnecting ties power, is characterized in that: comprises the following steps,

Step (1), to arbitrarily by the interconnected network of interconnection, be decomposed into the tree structure interconnected network model in N region, with any interconnection Tj, this interconnected network is divided into disjunct independently two parts electrical network mutually, the sending end electrical network and the receiving end electrical network that are respectively interconnection Tj, sending end electrical network comprises region 1～j, receiving end electrical network comprises region j+1～N;

Step (2), according to formula (1), calculates the active power fluctuation Δ P on interconnection Tj _tj,

${\mathrm{\ΔP}}_{\mathrm{Tj}}={\mathrm{ACE}}_j-K_j\mathrm{\Δf}+\underset{k}{\mathrm{\Σ}}{\mathrm{\ΔP}}_{\mathrm{Tk}}=\frac{\underset{m=j+1}{\overset{N}{\mathrm{\Σ}}}{K}_m}{K_{\mathrm{\Σ}}}\·\underset{n=1}{\overset{j}{\mathrm{\Σ}}}{\mathrm{ACE}}_n-\frac{\underset{n=1}{\overset{j}{\mathrm{\Σ}}}{K}_n}{K_{\mathrm{\Σ}}}\·\underset{m=j+1}{\overset{N}{\mathrm{\Σ}}}{\mathrm{ACE}}_m---\left(1\right)$

Wherein, ACE _j, ACE _m, ACE _nfor the ACE of region j, m, n; K _jfor the free-running frequency characteristic coefficient of region j; Δ f is the frequency departure of the whole interconnected network interconnected by interconnection; Δ P _tkfor the power swing on interconnection Tk, interconnection Tk be k article with directly interconnected interconnection of region j, k is and directly interconnected interconnection sum of region j; K _m, K _nfor the free-running frequency characteristic coefficient of region m, n; K _Σfor the free-running frequency characteristic coefficient sum of interconnected network All Ranges, N is the total number of All Ranges;

Step (3), in the time that interconnected network one place or a place above power disturbance occur, according to formula (2), calculates in interconnected network region k to j article of interconnection tie power fluctuation responsibility Δ P _k-Tj,

${\mathrm{\ΔP}}_{k-\mathrm{Tj}}=\frac{\mathrm{\Σ}{K}_{k-\mathrm{op}}}{K_{\mathrm{\Σ}}}{\mathrm{ACE}}_k,j=\mathrm{1,2},...,N-1;k=\mathrm{1,2},...,N---\left(2\right)$

Wherein, Δ P _k-Tjfor region k is to j article of interconnection tie power fluctuation responsibility; Σ K _k-opfor region k is by the free-running frequency characteristic coefficient sum in the interconnected offside region of interconnection Tj; K _Σfor the free-running frequency characteristic coefficient sum of interconnected network All Ranges; ACE _kfor the ACE of region k;

Step (4), determines each interconnection control target side formula of the interconnected network of N region tree structure of interconnected network, as shown in Equation (3),

$\mathrm{RMS}\left\{\stackrel{\‾}{{\mathrm{\ΔP}}_{\mathrm{Tj}}}\right\}\≤L_{\mathrm{Tj}}---\left(3\right)$

Wherein,

for interconnection Tj is at the root mean square of examination cycle internal power fluctuation mean value; L _tjbe j article of interconnection tie power fluctuation limit value, calculated by the root mean square of interconnection tie power fluctuation long-time statistical value;

Step (5), for the interconnected network that comprises N region, control zone i meets the control responsibility that formula (3) requires, and also should meet formula (4),

Wherein, Σ K _{i offside}for control zone i is by the free-running frequency characteristic coefficient sum in the interconnected offside region of interconnection Tj; K _ifor the free-running frequency characteristic coefficient of region i;

for the ACE mean value of control zone i; Δ P _tjfor the power swing on interconnection Tj; L _tjbe j article of interconnection tie power fluctuation limit value;

Step (6), controls responsibility according to the control zone i calculating, and calculates its T1, T2 index to interconnection Tj;

Step (7), according to T1, the T2 index calculated, judges whether the control of this control zone i meets the demands.

Aforesaid a kind of method of evaluating performance that adapts to the control of multi area interconnection interconnecting ties power, is characterized in that: step (6), and the process of calculating its T1 to interconnection Tj, T2 index is as follows,

(1) calculating of T1 index

According to formula (5) and formula (6), calculate T1 index,

T1 _i＝(2-CF _i)×100% （5）

Wherein, CF _ibe called the consistance factor, day part CF _istatistics, obtain according to formula (6),

Wherein,

for the ACE mean value of this control zone i in timing statistics section; K _ifor the free-running frequency characteristic coefficient of this control zone i;

for the mean value of the power swing on interconnection Tj in statistical time range; L _tjbe j article of interconnection tie power fluctuation limit value; Σ K _{i offside}for control zone i is in all control zones of interconnection Tj offside free-running frequency characteristic coefficient sum;

(2) calculating of T2 index

According to formula (7), the qualified requirement of ACE mean value of definition control zone i is:

Wherein,

for the ACE mean value of region i in 10 minutes sections; L _tj10for 10 minutes power swing limit values of interconnection Tj; K _ifor the free-running frequency characteristic coefficient of control zone i; Σ K _{i offside}for control zone i is in all control zones of interconnection Tj offside free-running frequency characteristic coefficient sum;

Qualified according to ACE mean value, by formula (8), calculate T2 index,

T2=(10 minutes qualified points of ACE/total 10 minutes calendar points) × 100%

（8）。

Aforesaid a kind of method of evaluating performance that adapts to the control of multi area interconnection interconnecting ties power, it is characterized in that: step (7) judges that the process whether control of this control zone i meets the demands is, when T1 >=200%, within the examination cycle, control zone i has contribution to suppressing interconnection tie power fluctuation; As 100% < T1 < 200%, within the examination cycle, control zone i has a responsibility for interconnection tie power fluctuation, but its responsibility does not exceed the degree of permission; When T1≤100%, within the examination cycle, control zone i has a responsibility for interconnection tie power fluctuation, and its responsibility has exceeded the scope allowing; If T2 index is more than or equal to examination threshold value, within the examination cycle, control zone i meets the demands to the control of interconnection, controls requirement otherwise do not meet.

The invention has the beneficial effects as follows: the method for evaluating performance of adaptation multi area interconnection interconnecting ties power of the present invention control, for multizone tree structure interconnected network, analyze its real power control principle, interconnection tie power fluctuation is resolved, specify the power swing impact of each region on every interconnection, design the method for evaluating performance of multi area interconnection interconnecting ties power control, effectively distinguish the responsibility of each control zone being should bear by interconnection tie power fluctuation and the contribution of doing, formulate the evaluation method of the each Region control performance of rational evaluation, have a good application prospect.

Accompanying drawing explanation

Fig. 1 is the process flow diagram of the method for evaluating performance of adaptation multi area interconnection interconnecting ties power of the present invention control.

Fig. 2 is the interconnected network illustraton of model of the tree structure that interconnected network is decomposed into N region of the present invention.

Embodiment

Below in conjunction with Figure of description, the invention will be further described.Following examples are only for technical scheme of the present invention is more clearly described, and can not limit the scope of the invention with this.

The method of evaluating performance of adaptation multi area interconnection interconnecting ties power of the present invention control, pass through certain regional power grid that extra-high voltage interconnection is interconnected for any one, be decomposed into n-quadrant tree structure interconnected network model, and the impact of each control zone on the power swing on interconnection when analyzing this interconnected network somewhere power disturbance occurs, draw the power swing responsibility of arbitrary control zone to arbitrary interconnection in interconnected network, determining after each interconnection control target of interconnected network, draw a certain control zone in this interconnected network control responsibility to interconnection, and the T1 that calculating is evaluated for interconnection control accordingly, T2 index is evaluated, as shown in Figure 1, specifically comprise the following steps,

Step (1), to arbitrarily by the interconnected network of interconnection, as shown in Figure 2, be decomposed into the tree structure interconnected network model in N region, with any interconnection Tj, this interconnected network is divided into disjunct independently two parts electrical network mutually, be respectively sending end electrical network and the receiving end electrical network of interconnection Tj, sending end electrical network comprises region 1～j, and receiving end electrical network comprises region j+1～N;

Step (2), according to formula (1), calculates the active power fluctuation Δ P on interconnection Tj _tj,

${\mathrm{\&Delta;P}}_{\mathrm{Tj}}={\mathrm{ACE}}_j-K_j\mathrm{\&Delta;f}+\underset{k}{\mathrm{\&Sigma;}}{\mathrm{\&Delta;P}}_{\mathrm{Tk}}=\frac{\underset{m=j+1}{\overset{N}{\mathrm{\&Sigma;}}}{K}_m}{K_{\mathrm{\&Sigma;}}}\&CenterDot;\underset{n=1}{\overset{j}{\mathrm{\&Sigma;}}}{\mathrm{ACE}}_n-\frac{\underset{n=1}{\overset{j}{\mathrm{\&Sigma;}}}{K}_n}{K_{\mathrm{\&Sigma;}}}\&CenterDot;\underset{m=j+1}{\overset{N}{\mathrm{\&Sigma;}}}{\mathrm{ACE}}_m---\left(1\right)$

Wherein, ACE _j, ACE _m, ACE _nfor the ACE of region j, m, n; K _jfor the free-running frequency characteristic coefficient of region j; Δ f is the frequency departure of the whole interconnected network interconnected by interconnection; Δ P _tkfor the power swing on interconnection Tk, interconnection Tk be k article with directly interconnected interconnection of region j, k is and directly interconnected interconnection sum of region j; K _m, K _nfor the free-running frequency characteristic coefficient of region m, n; K _Σfor the free-running frequency characteristic coefficient sum of interconnected network All Ranges, N is the total number of All Ranges, and following table 1 affects distribution table for N region to interconnection tie power fluctuation,

Show 1N region interconnection tie power fluctuation is affected to distribution table

Step (3), in the time that interconnected network one place or a place above power disturbance occur, according to formula (2), calculates in interconnected network region k to j article of interconnection tie power fluctuation responsibility Δ P _k-Tj,

${\mathrm{\&Delta;P}}_{k-\mathrm{Tj}}=\frac{\mathrm{\&Sigma;}{K}_{k-\mathrm{op}}}{K_{\mathrm{\&Sigma;}}}{\mathrm{ACE}}_k,j=\mathrm{1,2},...,N-1;k=\mathrm{1,2},...,N---\left(2\right)$

Wherein, Δ P _k-Tjfor region k is to j article of interconnection tie power fluctuation responsibility; Σ K _k-opfor region k is by the free-running frequency characteristic coefficient sum in the interconnected offside region of interconnection Tj; K _Σfor the free-running frequency characteristic coefficient sum of interconnected network All Ranges; ACE _kfor the ACE of region k;

Step (4), determines each interconnection control target side formula of the interconnected network of N region tree structure of interconnected network, as shown in Equation (3),

$\mathrm{RMS}\left\{\stackrel{\&OverBar;}{{\mathrm{\&Delta;P}}_{\mathrm{Tj}}}\right\}\&le;L_{\mathrm{Tj}}---\left(3\right)$

Wherein,

for interconnection Tj is at the root mean square of examination cycle internal power fluctuation mean value; L _tjbe j article of interconnection tie power fluctuation limit value, calculated by the root mean square of interconnection tie power fluctuation long-time statistical value;

Step (5), for the interconnected network that comprises N region, control zone i meets the control responsibility that formula (3) requires, and also should meet formula (4),

Wherein, Σ K _{i offside}for control zone i is by the free-running frequency characteristic coefficient sum in the interconnected offside region of interconnection Tj; K _ifor the free-running frequency characteristic coefficient of region i;

for the ACE mean value of control zone i; Δ P _tjfor the power swing on interconnection Tj; L _tjbe j article of interconnection tie power fluctuation limit value;

Step (6), controls responsibility according to the control zone i calculating, and calculates its T1, T2 index to interconnection Tj, and process is as follows,

(1) calculating of T1 index

According to formula (5) and formula (6), calculate T1 index,

T1 _i＝(2-CF _i)×100% （5）

Wherein, CF _ibe called the consistance factor, day part CF _istatistics, obtain according to formula (6),

Wherein,

for the ACE mean value of this control zone i in timing statistics section; K _ifor the free-running frequency characteristic coefficient of this control zone i;

for the mean value of the power swing on interconnection Tj in statistical time range; L _tjbe j article of interconnection tie power fluctuation limit value; Σ K _{i offside}for control zone i is in all control zones of interconnection Tj offside free-running frequency characteristic coefficient sum;

(2) calculating of T2 index

According to formula (7), the qualified requirement of ACE mean value of definition control zone i is:

Wherein,

for the ACE mean value of region i in 10 minutes sections; L _tj10for 10 minutes power swing limit values of interconnection Tj; K _ifor the free-running frequency characteristic coefficient of control zone i; Σ K _{i offside}for control zone i is in all control zones of interconnection Tj offside free-running frequency characteristic coefficient sum;

Qualified according to ACE mean value, by formula (8), calculate T2 index,

T2=(10 minutes qualified points of ACE/total 10 minutes calendar points) × 100%

（8）；

Step (7), according to T1, the T2 index calculated, judges whether the control of this control zone i meets the demands, and deterministic process is that, when T1 >=200%, within the examination cycle, control zone i has contribution to suppressing interconnection tie power fluctuation; As 100% < T1 < 200%, within the examination cycle, control zone i has a responsibility for interconnection tie power fluctuation, but its responsibility does not exceed the degree of permission; When T1≤100%, within the examination cycle, control zone i has a responsibility for interconnection tie power fluctuation, and its responsibility has exceeded the scope allowing; If T2 index is more than or equal to examination threshold value, within the examination cycle, control zone i meets the demands to the control of interconnection, controls requirement otherwise do not meet.

More than show and described ultimate principle of the present invention, principal character and advantage.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that in above-described embodiment and instructions, describes just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.

Claims (3)

1. a method of evaluating performance that adapts to the control of multi area interconnection interconnecting ties power, is characterized in that: comprises the following steps,

Step (1), to arbitrarily by the interconnected network of interconnection, be decomposed into the tree structure interconnected network model in N region, with any interconnection Tj, this interconnected network is divided into disjunct independently two parts electrical network mutually, the sending end electrical network and the receiving end electrical network that are respectively interconnection Tj, sending end electrical network comprises region 1～j, receiving end electrical network comprises region j+1～N;

Step (2), according to formula (1), calculates the active power fluctuation Δ P on interconnection Tj _tj,

${\mathrm{\&Delta;P}}_{\mathrm{Tj}}={\mathrm{ACE}}_j-K_j\mathrm{\&Delta;f}+\underset{k}{\mathrm{\&Sigma;}}{\mathrm{\&Delta;P}}_{\mathrm{Tk}}=\frac{\underset{m=j+1}{\overset{N}{\mathrm{\&Sigma;}}}{K}_m}{K_{\mathrm{\&Sigma;}}}\&CenterDot;\underset{n=1}{\overset{j}{\mathrm{\&Sigma;}}}{\mathrm{ACE}}_n-\frac{\underset{n=1}{\overset{j}{\mathrm{\&Sigma;}}}{K}_n}{K_{\mathrm{\&Sigma;}}}\&CenterDot;\underset{m=j+1}{\overset{N}{\mathrm{\&Sigma;}}}{\mathrm{ACE}}_m---\left(1\right)$

Wherein, ACE _j, ACE _m, ACE _nfor the ACE of region j, m, n; K _jfor the free-running frequency characteristic coefficient of region j; Δ f is the frequency departure of the whole interconnected network interconnected by interconnection; Δ P _tkfor the power swing on interconnection Tk, interconnection Tk be k article with directly interconnected interconnection of region j, k is and directly interconnected interconnection sum of region j; K _m, K _nfor the free-running frequency characteristic coefficient of region m, n; K _Σfor the free-running frequency characteristic coefficient sum of interconnected network All Ranges, N is the total number of All Ranges;

Step (3), in the time that interconnected network one place or a place above power disturbance occur, according to formula (2), calculates in interconnected network region k to j article of interconnection tie power fluctuation responsibility Δ P _k-Tj,

${\mathrm{\&Delta;P}}_{k-\mathrm{Tj}}=\frac{\mathrm{\&Sigma;}{K}_{k-\mathrm{op}}}{K_{\mathrm{\&Sigma;}}}{\mathrm{ACE}}_k,j=\mathrm{1,2},...,N-1;k=\mathrm{1,2},...,N---\left(2\right)$

Wherein, Δ P _k-Tjfor region k is to j article of interconnection tie power fluctuation responsibility; Σ K _k-opfor region k is by the free-running frequency characteristic coefficient sum in the interconnected offside region of interconnection Tj; K _Σfor the free-running frequency characteristic coefficient sum of interconnected network All Ranges; ACE _kfor the ACE of region k;

Step (4), determines each interconnection control target side formula of the interconnected network of N region tree structure of interconnected network, as shown in Equation (3),

$\mathrm{RMS}\left\{\stackrel{\&OverBar;}{{\mathrm{\&Delta;P}}_{\mathrm{Tj}}}\right\}\&le;L_{\mathrm{Tj}}---\left(3\right)$

Wherein,

for interconnection Tj is at the root mean square of examination cycle internal power fluctuation mean value; L _tjbe j article of interconnection tie power fluctuation limit value, calculated by the root mean square of interconnection tie power fluctuation long-time statistical value;

Step (5), for the interconnected network that comprises N region, control zone i meets the control responsibility that formula (3) requires, and also should meet formula (4),

Wherein, Σ K _{i offside}for control zone i is by the free-running frequency characteristic coefficient sum in the interconnected offside region of interconnection Tj; K _ifor the free-running frequency characteristic coefficient of region i;

for the ACE mean value of control zone i; Δ P _tjfor the power swing on interconnection Tj; L _tjbe j article of interconnection tie power fluctuation limit value;

Step (6), controls responsibility according to the control zone i calculating, and calculates its T1, T2 index to interconnection Tj;

Step (7), according to T1, the T2 index calculated, judges whether the control of this control zone i meets the demands.

2. a kind of method of evaluating performance that adapts to the control of multi area interconnection interconnecting ties power according to claim 1, is characterized in that: step (6), and the process of calculating its T1 to interconnection Tj, T2 index is as follows,

(1) calculating of T1 index

According to formula (5) and formula (6), calculate T1 index,

T1 _i＝(2-CF _i)×100% （5）

Wherein, CF _ibe called the consistance factor, day part CF _istatistics, obtain according to formula (6),

Wherein,

for the ACE mean value of this control zone i in timing statistics section; K _ifor the free-running frequency characteristic coefficient of this control zone i;

for the mean value of the power swing on interconnection Tj in statistical time range; L _tjbe j article of interconnection tie power fluctuation limit value; Σ K _{i offside}for control zone i is in all control zones of interconnection Tj offside free-running frequency characteristic coefficient sum;

(2) calculating of T2 index

According to formula (7), the qualified requirement of ACE mean value of definition control zone i is:

Wherein, for the ACE mean value of region i in 10 minutes sections; L _tj10for 10 minutes power swing limit values of interconnection Tj; K _ifor the free-running frequency characteristic coefficient of control zone i; Σ K _{i offside}for control zone i is in all control zones of interconnection Tj offside free-running frequency characteristic coefficient sum;

Qualified according to ACE mean value, by formula (8), calculate T2 index,

T2=(10 minutes qualified points of ACE/total 10 minutes calendar points) × 100%

（8）。

3. a kind of method of evaluating performance that adapts to the control of multi area interconnection interconnecting ties power according to claim 1 and 2, it is characterized in that: step (7) judges that the process whether control of this control zone i meets the demands is, when T1 >=200%, within the examination cycle, control zone i has contribution to suppressing interconnection tie power fluctuation; As 100% < T1 < 200%, within the examination cycle, control zone i has a responsibility for interconnection tie power fluctuation, but its responsibility does not exceed the degree of permission; When T1≤100%, within the examination cycle, control zone i has a responsibility for interconnection tie power fluctuation, and its responsibility has exceeded the scope allowing; If T2 index is more than or equal to examination threshold value, within the examination cycle, control zone i meets the demands to the control of interconnection, controls requirement otherwise do not meet.

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