CN102930141A - Quick calculation method for controlling power grid complicated monitoring section tidal current - Google Patents

Abstract

The invention discloses a quick calculation method for controlling power grid complicated monitoring section tidal current. The method is simplified and abstracted according to an actual power grid structure, and a monitoring section topological graph based on a directed picture is constructed. The overload of a monitoring section can be gradually eliminated according to a rule from bottom to top; node adjustment values are quickly distributed by using a coefficient matrix; and an algorithm is realized according to an adjacent matrix and a path matrix in a graph theory. The simulation result of an example shows that the method provided by the invention is feasible and effective in complicated section monitoring.

Description

The quick calculation method of the complicated monitoring of a kind of electrical network section tidal current control

Technical field

The invention belongs to electrical equipment and electrical engineering technical field, be applicable to the quick control of the complicated monitoring of electrical network section tidal current after out-of-limit, significant to guaranteeing power grid security.

Technical background

In recent years, repeatedly large area blackout occurs in electric system, add such as " 814 " U.S.A have a power failure on a large scale, " 114 " Europe has a power failure on a large scale, " 730 ", " 731 " India have a power failure on a large scale etc., the economic loss that causes and social influence are extremely serious.

China's electric power networks structure is relatively weaker, and the energy and economic development are uneven, and electric power resource and power load distributed pole are inhomogeneous, and the electric power more than needed of repository needs to be transported to load center by long distance transmission line.Expect the year two thousand twenty, will have every year 100000MW electric power to be sent to the east by many AC/DC parallel circuits from western part.

Power plant generally accesses electrical network according to electric pressure according to nearby principle, a plurality of concentrating again after sending passage and compiling sent, and so often has a plurality of power plant and shares one and send passage, causes some areas electric power to be sent and is obstructed, send passage and press for a long time limit operation, stabilization of power grids problem is very outstanding.The limit of transmission cross-section is restricted by angle stability, thermally-stabilised, voltage stabilization mainly, and when the circuit transmission power surpasses stability limit, in case disturbance occurs, the stabilization of power grids is very likely destroyed, thereby causes large area blackout, the serious threat power grid security.

Compound section for single section, refer to one group electric have contact directly, interactional section set.A plurality of control section Relations Amongs in the compound section are complicated, each control section has compiled a plurality of subordinates section, the fluctuation of the inconsistent and regional earth mat load on power plant's generating capacity time that subordinate's section is incorporated into the power networks, space, the capital has influence on the trend of higher level's section, the section reason of over-load is complicated, therefore also brings difficulty for the regulation and control of scheduling at different levels.When guaranteeing the passway for transmitting electricity utilization factor, a plurality of sections of sending on the passage are carried out real time monitoring, when the generation section is out-of-limit, according to open, fair and impartial " three public affairs " principle, regulation and control are transshipped to eliminate fast, and are for ensureing electricity net safety stable, significant.

Summary of the invention

Purpose of the present invention is just for can be after complexity is monitored section and transshipped, the section tidal current control program is calculated fast, for Dispatchers on duty or the automatic control system of electric system provides the control strategy reference, with the overload of all monitoring sections of quick elimination, thereby guarantee power grid security.

The objective of the invention is to realize by following technical solution.

The quick calculation method of the complicated monitoring of a kind of electrical network section tidal current control, feature of the present invention is:

(1) set up based on the complicated section topological model of monitoring of the electrical network of graph theory; The section that needs in the actual electric network to monitor comprises main transformer, transmission line of electricity element, and each section is in respectively the superior and the subordinate of passway for transmitting electricity, and connection type is various, sends trend and interacts.Each section that mainly comprises the needs monitoring in the monitoring section topological diagram of setting up, all the other uncorrelated factory stations, circuit are simplified in topological diagram; Substation bus bar is abstract to be summit V in the digraph, and needing the elements such as main transformer, circuit of monitoring abstract is limit E in the digraph;

(2). set up the regulation and control allocation proportion that matrix of coefficients K reflects each section; K is the square formation (k on n * n rank _Ij) _{N * n}, n is the summit number of monitoring section topological diagram; If section l _IjTrend need to adjust Δ p _Ij, the capable vector that the resize ratio that then all nodes be should bear in the network forms is K _i, K _iMiddle all elements sum is 1; What matrix of coefficients K reflected is the percentage contribution that each node is regulated and control section, can calculate according to proportional sharing principle, can require arrange according to the regulation and control in the production reality;

(3). set up the adjustment vector M _tThe trend size that the reflection moment each node of t should be adjusted; M _tBe the row vector of 1 * n dimension, (to carry out size be m to the section tidal current of sending of 1≤i≤n) to node i _iRegulation and control after, the constantly out-of-limit whole eliminations of all monitoring sections of t;

(4). using formula Δ P _t=P'-P _tCalculate the constantly nargin matrix Δ P of t _tΔ P _tSquare formation (Δ p for n * n rank _Ij) _{N * n}, P ' is the limit value matrix of this monitor network, consists of P by the monitoring limit value of each section _tBe the trend matrix of moment t, by the SCADA system acquisition in the electric system.Nargin matrix Δ P _tEach section is in the section nargin size of moment t, if Δ p in the reflection monitor network _Ij＜0, section l then _IjOut-of-limit, if Δ p _Ij0, section l then _IjNot out-of-limit;

(5) if. a certain section l _IjTrend is out-of-limit, according to the principle of " from bottom to top ", eliminates first the out-of-limit of its all subordinate's sections, then upgrades the nargin matrix, if this section still transships, then according to matrix of coefficients K, determines the adjustment trend size that each node be should bear, to eliminate this section overload;

(6). travel through all and monitor section, and the overload section is carried out the measure of eliminating overload, until all section overloads are eliminated, obtain the constantly adjustment vector M of t _t

Because electric network composition changes little, need the section of monitoring relatively fixing, the structure of therefore monitoring the section topological model can carry out by off-line, adjusts vector M _tCalculating mainly be matrix operation, can satisfy the requirement of online rapid calculation; The Dispatchers on duty of electric system or automatic control system are according to adjusting vector M _tThe monitoring section is controlled fast, can when guaranteeing channel utilization index, " three public affairs " dispatching principle, effectively be eliminated fast the out-of-limit of all monitoring sections of moment t, thereby guarantee the safety of electrical network.

If a certain section l _IjOut-of-limit, all eliminate but all sections of its subordinate are out-of-limit, then for eliminating this section overload, the adjustment amount that each node is born is by the vector of the i every trade among matrix of coefficients K K _iDetermine.Matrix of coefficients K can arrange according to producing actual needs, also can adjust principle according to equal proportion and calculate, and computing method are:

(1) initialization K=P _t, with all are set to 0 less than 0 element among the K, revise complete after, each row of K are carried out normalization;

(2) make K=K ^T, i=1;

(3) make j=1;

(4) if k _Ij≠ 0, then travel through h=1 ~ n, step-length is 1, to each h, such as k _Jh≠ 0, then make k _Ih=k _Ij* k _JhTraversal makes k after finishing _Ij=0;

(5) j=j+1, execution in step (4) is until j〉n;

(6) i=i+1, execution in step (3) is until i〉n;

(7) if the row vector of traversal matrix of coefficients K is K _x=0, then make k _Xx=1, calculate and finish.

Below in conjunction with the drawings and specific embodiments the present invention is done further explanation.

Description of drawings

Fig. 1 is policing algorithm schematic flow sheet of the present invention;

Fig. 2 is the electric network wiring scheme of an embodiment of the present invention;

Fig. 3 is the monitoring section topological diagram of an embodiment of the present invention.

Embodiment

Embodiment

If total n the summit of a certain monitoring section topology, the trend matrix is P _t, the limit value matrix is P ', nargin matrix Δ P _t=P '-P _t, path matrix T, matrix of coefficients K adjusts vector M _tAdjust vector M _tFind the solution flow process as shown in Figure 1, concrete derivation algorithm is as follows:

(1) vector M is adjusted in initialization _t=0;

(2) traversal Δ P _tMiddle all elements is such as Δ p _Ij＜0, then represent section l _IjOut-of-limit, enter step (3);

(3) traversal x=1 ~ n, step-length is 1, if t _Xi≠ 0, show that node x is positioned at section l _IjSubordinate, execution in step (4) then; Traversal finishes, and shows that subordinate's section is all without overload, execution in step (5);

(4) traversal y=1 ~ n, step-length is 1, if

The section of sending that shows node x transships then recursive call step (3); Traversal finishes, and returns step (3);

(5) the overload section of establishing current search is l _Xy, then

K wherein _xX every trade vector for matrix of coefficients;

(6) upgrade nargin matrix Δ P _t, section l _XyAll superior nodes send section nargin and all increase

(7) if all section overloads are eliminated, then computing stops, otherwise, continue step (2).

According to adjusting vector M _tEach node is regulated and control to eliminate constantly all section overloads of t, if m _iBe negative value, then exerting oneself of node i adjusted and reduced | m _i|, if m _iFor on the occasion of, then with the increase of exerting oneself of node i | m _i|.

Take the area power grid of From Western Yunnan as example, feasibility and the validity of regulation and control algorithm is described.The From Western Yunnan hydroelectric resources is abundant, and total installed capacity reaches 1,420 ten thousand kilowatts, and a large amount of small power stations send and are obstructed in flood season, send passage and press for a long time limit operation.The area power grid wiring as shown in Figure 2, the method according to this invention has made up corresponding monitoring section topological diagram, as shown in Figure 3.If a certain moment, section l ₂₁, l _2,l ₇₅Simultaneously out-of-limit, regulation and control algorithm according to the present invention is tried to achieve matrix of coefficients K as the formula (1),

$\left[\begin{array}{cccccccccc}0& 0& 0& 0.044521& 0& 0.054795& 0& 0.205479& 0.099315& 0.59589\\ 0& 0& 0& 0.044521& 0& 0.054795& 0& 0.205479& 0.099315& 0.59589\\ 0& 0& 1& 0& 0& 0& 0& 0& 0& 0\\ 0& 0& 0& 1& 0& 0& 0& 0& 0& 0\\ 0& 0& 0& 0& 0& 0.057348& 0& 0.215054& 0.103943& 0.623656\\ 0& 0& 0& 0& 0& 1& 0& 0& 0& 0\\ 0& 0& 0& 0& 0& 0& 0& 0.674157& 0.325843& 0\\ 0& 0& 0& 0& 0& 0& 0& 1& 0& 0\\ 0& 0& 0& 0& 0& 0& 0& 0& 1& 0\\ 0& 0& 0& 0& 0& 0& 0& 0& 0& 1\end{array}\right]---\left(1\right)$

Try to achieve the adjustment vector M _t=[0,0,0,0,0 ,-1,0 ,-6 ,-2,-10], namely to node 6,8,9,10 on send power and adjust and reduce respectively 1MW, 6MW, 2MW, 10MW after, can eliminate fast the out-of-limit of all monitoring sections, and each passage is regulated and control according to the equal proportion principle, satisfy " three public affairs " scheduling requirement, regulating effect is as shown in table 1.

The table 1 regulating effect table of comparisons

Claims (1)

1. an electrical network complexity is monitored the quick calculation method that section tidal current is controlled, and it is characterized in that:

(1). set up the complicated monitoring of the electrical network section topological model based on graph theory; The section that needs in the actual electric network to monitor comprises main transformer, transmission line of electricity element, and each section is in respectively the superior and the subordinate of passway for transmitting electricity, and connection type is various, sends trend and interacts; Each section that mainly comprises the needs monitoring in the monitoring section topological diagram of setting up, all the other uncorrelated factory stations, circuit are simplified in topological diagram; Substation bus bar is abstract to be summit V in the digraph, and needing the elements such as main transformer, circuit of monitoring abstract is limit E in the digraph;

(2). set up the regulation and control allocation proportion that matrix of coefficients K reflects each section; K is the square formation (k on n * n rank _Ij) _{N * n}, n is the summit number of monitoring section topological diagram; If section l _IjTrend need to adjust Δ p _Ij, the capable vector that the resize ratio that then all nodes be should bear in the network forms is K _i, K _iMiddle all elements sum is 1; What matrix of coefficients K reflected is the percentage contribution that each node is regulated and control section, calculates according to proportional sharing principle, requires to arrange according to the regulation and control in the production reality;

(3). set up the adjustment vector M _tThe trend size that the reflection moment each node of t should be adjusted; M _tBe the row vector of 1 * n dimension, (to carry out size be m to the section tidal current of sending of 1≤i≤n) to node i _iRegulation and control after, the constantly out-of-limit whole eliminations of all monitoring sections of t;

(4). using formula Δ P _t=P '-P _tCalculate the constantly nargin matrix Δ P of t _tΔ P _tSquare formation (Δ p for n * n rank _Ij) _{N * n}, P ' is the limit value matrix of this monitor network, consists of P by the monitoring limit value of each section _tBe the trend matrix of moment t, by the SCADA system acquisition in the electric system; Nargin matrix Δ P _tEach section is in the section nargin size of moment t, if Δ p in the reflection monitor network _Ij＜0, section l then _IjOut-of-limit, if Δ p _Ij0, section l then _IjNot out-of-limit;

(5) if. a certain section l _IjTrend is out-of-limit, according to the principle of " from bottom to top ", eliminates first the out-of-limit of its all subordinate's sections, then upgrades the nargin matrix, if this section still transships, then according to matrix of coefficients K, determines the adjustment trend size that each node be should bear, to eliminate this section overload;

(6). travel through all and monitor section, and the overload section is carried out the measure of eliminating overload, until all section overloads are eliminated, obtain the constantly adjustment vector M of t _t

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