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 adapting to the power control of multi-area interconnected grid tie lines. For any regional grid interconnected through a certain UHV tie line, it is decomposed into an N-area tree structure interconnected grid model, and by analyzing the The influence of each control area on the power fluctuation of the tie line when a power disturbance occurs somewhere in the interconnected grid, the power fluctuation responsibility of any control area in the interconnected grid to any tie line is obtained, and in determining the control of each tie line in the interconnected grid After the goal, the control responsibility of a certain control area in the interconnected grid to the tie line is obtained, and the T1 and T2 indicators used for the evaluation of tie line control are calculated based on this, and the response of each control area to the power fluctuation of the tie line is effectively distinguished. Responsibilities undertaken and contributions made, the development of an evaluation method for reasonably evaluating the control performance of each area has a 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 performance evaluation method adapting to multi-area interconnected power grid tie line power control, characterized in that: comprising the following steps, Step (1), decompose any interconnected grid that passes through the tie line into a tree structure interconnected grid model of N regions, and use any tie line Tj to divide the interconnected grid into two independent parts of the grid that are not connected to each other. are respectively the sending-end power grid and the receiving-end power grid of the tie line Tj, the sending-end power grid includes areas 1~j, and the receiving-end power grid includes areas j+1~N; Step (2), according to the formula (1), calculate the active power fluctuation ΔP _Tj on the tie line Tj, ${\mathrm{<span\; class="notranslate">\; \&Delta;P</span>}}_{\mathrm{<span\; class="notranslate">\; Tj</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; ACE</span>}}_{\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; j</span>}}\mathrm{<span\; class="notranslate">\; \&Delta;f</span>}<span\; class="notranslate">\; +</span>\underset{\mathrm{<span\; class="notranslate">\; k</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}{\mathrm{<span\; class="notranslate">\; \&Delta;P</span>}}_{\mathrm{<span\; class="notranslate">\; Tk</span>}}<span\; class="notranslate">\; =</span>\frac{\underset{\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; j</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; N</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}}}{{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}<span\; class="notranslate">\; \&Center\; Dot;</span>\underset{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; j</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{\mathrm{<span\; class="notranslate">\; ACE</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; -</span>\frac{\underset{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; j</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}}{{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}<span\; class="notranslate">\; \&Center\; Dot;</span>\underset{\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; j</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; N</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{\mathrm{<span\; class="notranslate">\; ACE</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$ Among them, ACE _j , ACE _m , and ACE _{n are} ACEs in areas j, m, and n; K _j is the natural frequency characteristic coefficient of area j; Δf is the frequency deviation of the entire interconnected grid interconnected by tie lines; The power fluctuation on the line Tk, the tie line Tk is the kth tie line directly interconnected with area j, k is the total number of tie lines directly interconnected with area j; K _m and K _n are the natural frequency characteristic coefficients of areas m and n ; K _Σ is the sum of the natural frequency characteristic coefficients of all areas of the interconnected grid, and N is the total number of all areas; Step (3), when power disturbance occurs at one or more places in the interconnected grid, according to the formula (2), the responsibility for the power fluctuation ΔP _k-Tj of the area k in the interconnected grid to the j-th tie line is calculated, ${\mathrm{<span\; class="notranslate">\; \&Delta;P</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; Tj</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; op</span>}}}{{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{\mathrm{<span\; class="notranslate">\; ACE</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; j</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1,2</span>}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; N</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; ;</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1,2</span>}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; N</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$ Among them, ΔP _k-Tj is the power fluctuation responsibility of area k to the jth tie line; ΣK _k-op is the sum of the natural frequency characteristic coefficients of the opposite areas interconnected by area k through the tie line Tj; K _Σ is all areas of the interconnected grid The sum of the natural frequency characteristic coefficients of ; ACE _k is the ACE of area k; Step (4), determine the control objective equations of each tie line of the interconnected grid in the tree structure of N areas of the interconnected grid, as shown in formula (3), $\mathrm{<span\; class="notranslate">\; RMS</span>}<span\; class="notranslate">\; \{</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; \&Delta;P</span>}}_{\mathrm{<span\; class="notranslate">\; Tj</span>}}}<span\; class="notranslate">\; \}</span><span\; class="notranslate">\; \&le;</span>{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; Tj</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; )</span>$ in,

L Tj is the root mean square of the average value of the power fluctuation of the tie line Tj in the assessment period; L _Tj is the power fluctuation limit of the jth tie line, calculated from the root mean square of the long-term statistical value of the power fluctuation of the tie line; Step (5), for an interconnected grid that includes N areas, the control area i satisfies the control responsibility required by formula (3), and should also satisfy formula (4),

Among them, _{the opposite side of ΣK i} is the sum of the natural frequency characteristic coefficients of the opposite areas interconnected by the control area i through the tie line Tj; K _i is the natural frequency characteristic coefficient of area i;

is the average value of ACE in the control area i; ΔP _Tj is the power fluctuation on the tie line Tj; L _Tj is the power fluctuation limit of the jth tie line; Step (6), according to the calculated control responsibility of the control area i, calculate its T1 and T2 indicators for the tie line Tj; In step (7), according to the calculated T1 and T2 indicators, it is judged whether the control of the control area i meets the requirements. 2. A performance evaluation method adapting to the power control of tie lines of multi-area interconnected power grids according to claim 1, characterized in that: step (6), the process of calculating the T1 and T2 indexes of the tie lines Tj is as follows, (1) Calculation of T1 indicators According to formula (5) and formula (6), calculate the T1 index, T1 _i ＝(2-CF _i )×100% (5) Among them, CF _i is called the consistency factor, and the statistics of CF _i in each period can be obtained according to formula (6), in,

is the ACE average value of the control area i in the statistical period; K _i is the natural frequency characteristic coefficient of the control area i;

is the average value of the power fluctuation on the tie line Tj within the statistical period; L _Tj is the power fluctuation limit of the jth tie line; _{the opposite side of ΣK i} is the natural frequency characteristics of all control areas in the control area i on the opposite side of the tie line Tj sum of coefficients; (2) Calculation of T2 indicators According to the formula (7), the qualified requirement for the average value of ACE in defined control area i is:

in, is the average value of ACE in area i within 10 minutes; L _Tj10 is the 10-minute power fluctuation limit of tie line Tj; K _i is _the natural frequency characteristic coefficient of control area i; The sum of the natural frequency characteristic coefficients of all control areas on the opposite side of the line Tj; According to the average value of ACE, through the formula (8), calculate the T2 index, T2 = (10-minute ACE qualifying points/total 10-minute calendar points) × 100% (8). 3. A performance evaluation method adapting to the power control of multi-area interconnected power grid tie lines according to claim 1 or 2, characterized in that: the process of step (7) judging whether the control of the control area i meets the requirements is as follows: when T1≥200%, during the assessment period, the control area i contributes to suppressing the power fluctuation of the tie line; when 100%<T1<200%, during the assessment period, the control area i is responsible for the power fluctuation of the tie line, but its responsibility It does not exceed the allowable level; when T1≤100%, within the assessment period, the control area i is responsible for the power fluctuation of the tie line, and its responsibility exceeds the allowable range; if the T2 index is greater than or equal to the assessment threshold, within the assessment period , the control area i meets the requirements for the control of the tie line, otherwise it does not meet the control requirements.

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