CN106532696A - Power grid accident risk early warning method and device - Google Patents

Abstract

The invention provides a power grid accident risk early warning method and device, and relates to the technical field of a smart power grid. The method comprises the steps of: acquiring line information of each line in a simulated power grid, and selecting a target line; extracting configuration data of the target line, and searching key equipment of the target line and node information associated with the target line; carrying out searching by using the selected target line and the key equipment as the center, and establishing an accident set; calculating a tidal current overload risk index and a voltage out-of-limit risk index of each line in the accident set and respectively comparing the tidal current overload risk index and the voltage out-of-limit risk index of each line with corresponding risk set ranges; and sending a comparison result of exceeding the corresponding risk set ranges to power grid monitoring personnel. According to the power grid accident risk early warning method and device provided by the invention, the lines and the nodes, which exceed the risk set ranges, can be sent to the power grid monitoring personnel, so that the power grid monitoring personnel determines a risk level of a power grid accident, so that operators are reasonably arranged to carry out a scheduling operation, and safe and stable operation of the power grid is ensured.

Description

Power grid accident method for prewarning risk and device

Technical field

The present invention relates to intelligent power grid technology field, more particularly, to a kind of power grid accident method for prewarning risk and device.

Background technology

With economic continuous development and the increasingly increase of electricity needs, electrical network scale and number of devices are also increasingly increasing Plus so that the task of the capital construction, technological transformation and grid equipment maintenance of power system increases, and the method for operation of electrical network is also got over Come more complicated, on the one hand improve the operational efficiency of power system, on the other hand also increase the uncertain of Operation of Electric Systems Property.The growth requirement that power system is had been directed towards in prior art has formulated the electrical network tune for coordinating grid maintenance, transformation and optimization Degree work, however, as dispatching of power netwoks behavior itself can be affected by uncertain factor, decision of power system dispatching department often by It is in making and the incongruent scheduling operation of actual accidents risk to the indefinite of accident risk grade, electric not only bad for excluding Net accident, also can bring certain risk to electric power netting safe running, bring serious threat to power network safety operation, Huge challenge is brought to traffic control.

For due to making and the incongruent scheduling operation of actual accidents risk to the indefinite of accident risk grade, giving Electric power netting safe running brings certain risk, causes the problem seriously threatened by power network safety operation, not yet carries at present Go out effective solution.

The content of the invention

In view of this, it is an object of the invention to provide power grid accident method for prewarning risk and device, with alleviate due to The indefinite of accident risk grade is made electric power netting safe running band is given with the incongruent scheduling operation of actual accidents risk Carry out the technical problem of certain risk.

In a first aspect, a kind of power grid accident method for prewarning risk is embodiments provided, including：Obtain simulating grid In each circuit line information, target line is chosen from line information；Wherein, simulating grid is with the corresponding side of forecast failure Formula dry run, target line are the circuit that forecast failure is located；The configuration data of target line is extracted, is looked in configuration data Look for the key equipment and the nodal information associated with target line of target line；With the target line and target line of selection Scan for centered on key equipment, set up accident set, wherein, the accident set includes the pass with target line and target line Button apparatus have the circuit and node of same node point；Calculate accident set in each circuit trend overload risk index, and with it is every The voltage limit risk index of the node of individual circuit association；By the trend of each circuit overload risk index and with each circuit The voltage limit risk index of the node of association is compared with corresponding risk setting range respectively；Will be beyond corresponding risk The comparative result of setting range is sent to power system monitor personnel.

With reference in a first aspect, embodiments provide the first possible embodiment of first aspect, wherein, meter The trend overload risk index of each circuit in accident set is calculated, and the voltage limit risk of the node associated with each circuit is referred to Number includes：When forecast failure occurs, the trend overload factor and the electricity of each node of each circuit in accident set are calculated Press out-of-limit coefficient；Wherein, the trend overload factor of each circuit is expressed as：

I refers to the i-th line road of accident set, and c is forecast failure accident, S_ciFor the apparent energy on i-th line road, S_iNIt is i-th The rated power of bar circuit；The voltage out-of-limit coefficient of each node is expressed as：

J is j-th node associated with i-th line road in accident set, U_cjIt is the voltage magnitude of j-th node, U_inf,jWith U_sup,jIt is the higher limit and lower limit of the voltage of j-th node permission；According to the trend overload factor and each section of each circuit The voltage out-of-limit coefficient of point calculates circuit overload consequence I_{S, ci}With out-of-limit consequence I of node voltage_{V, cj}, wherein, circuit overload consequence and The out-of-limit consequence of node voltage is expressed as：

Calculate the trend overload risk index R on i-th line road_{S, ci}With the voltage limit risk index R of j-th node_{V, cj}, Wherein, R_{S, ci}With the R_{V, cj}It is expressed as：

R_S,ci=P_c·I_S,ci

R_V,ci=P_c·I_V,cj

P_cFor the probability that the forecast failure accident occurs.

With reference to the first possible embodiment of first aspect, second of first aspect is embodiments provided Possible embodiment, wherein, said method also includes：When the quantity of forecast failure is multiple, multiple forecast failures are calculated The trend overload risk index R on lower i-th line road_{S, i}With the voltage limit risk index R of j-th node_{V, j}, it is expressed as：

Wherein, n_cThe quantity of the forecast failure included for accident set；The trend overload of each circuit that accident set is included Risk index is ranked up, and draws ranking results, selects trend overload risk index highest circuit, to tide from ranking results Flowing through load risk index highest circuit carries out risk control；And/or, the voltage out-of-limit wind of each node that accident set is included Dangerous index is ranked up, and draws ranking results, selects voltage limit risk index highest node, to voltage from ranking results Out-of-limit risk index highest node carries out risk control.

With reference to the first possible embodiment of first aspect, embodiments provide first aspect the third Possible embodiment, wherein, said method also includes：Calculate trend overload risk index that each forecast failure causes and by The voltage limit risk index of the node that forecast failure causes, wherein, the trend overload risk index that each forecast failure causes Use R_{S, c}Represent, it is contemplated that the voltage limit risk index R of the node that failure causes_{V, c}Represent：

Wherein, n_lAnd n_bRespectively represent accident set in number of, lines and number of nodes.The tide caused by each forecast failure Flow through load risk index to be ranked up, draw ranking results, the trend overload risk index highest is selected from ranking results Forecast failure, to trend overload risk index highest forecast failure carry out risk control；And/or, forecast failure is caused The voltage limit risk index of node be ranked up, draw ranking results, from ranking results, select voltage limit risk to refer to Number highest forecast failure, carries out risk control to voltage limit risk index highest forecast failure.

With reference to the first possible embodiment of first aspect, the 4th kind of first aspect is embodiments provided Possible embodiment, wherein, said method also includes：The voltage limit risk index of calculating simulation electrical network, judges that voltage is got over Whether limit risk index exceedes risk threshold value set in advance, if it is, the information beyond risk threshold value is sent to electrical network prison Control personnel；Wherein, the voltage limit risk exponential representation of simulating grid is：

n_bNumber of nodes in expression accident set；n_cThe quantity of the forecast failure included for accident set.

With reference in a first aspect, embodiments provide the 5th kind of possible embodiment of first aspect, wherein, on Stating method also includes：Load during calculating simulation grid collapses cuts down risk schedule, and load is cut down risk schedule Power system monitor personnel are given, to instruct the scheduling operation of power system monitor personnel, wherein, it is to protect in relay that load cuts down risk schedule The risk index after the given load of simulating grid is cut off under shield or manual control, is expressed as：

Wherein, v is the interstitial content that load is cut down, L occur_jFor the load reduction of j-th load reduction node, a_jFor The important coefficient of the load of j-th load reduction node, wherein, the important coefficient of load is determined by load level.

Second aspect, the embodiment of the present invention also provide a kind of power grid accident Risk-warning device, including：Target line is chosen Module, for obtaining the line information of each circuit in simulating grid, chooses target line from line information；Wherein, simulate With the corresponding mode dry run of forecast failure, target line is the circuit that forecast failure is located to electrical network；Information searching module, uses In the configuration data for extracting target line, the key equipment of target line is searched in configuration data and is associated with target line Nodal information；Accident set sets up module, carries out centered on the key equipment for target line and target line to choose Search, sets up accident set, wherein, accident set includes that the key equipment with target line and target line has the line of same node point Road and node；Index computing module, for calculate each circuit in accident set trend transship risk index, and with each line The voltage limit risk index of the node of road association；Index comparison module, by the trend of each circuit overload risk index and It is compared with corresponding risk setting range with the voltage limit risk index of the node of each circuit association respectively；As a result send out Module is sent, for the comparative result beyond corresponding risk setting range is sent to power system monitor personnel.

With reference to second aspect, the first possible embodiment of second aspect is embodiments provided, wherein, on Stating index computing module includes：First computing unit, for when forecast failure occurs, calculating the tide of each circuit in accident set The voltage out-of-limit coefficient of stream overload factor and each node；Wherein, the trend overload factor of each circuit is expressed as：

I refers to the i-th line road of accident set, and c is forecast failure accident, S_ciFor the apparent energy on i-th line road, S_iNIt is i-th The rated power of bar circuit；The voltage out-of-limit coefficient of each node is expressed as：

J is j-th node associated with i-th line road in accident set, U_cjIt is the voltage magnitude of j-th node, U_inf,jWith U_sup,jIt is the higher limit and lower limit of the voltage of j-th node permission；Second computing unit, for the trend according to each circuit The voltage out-of-limit coefficient of overload factor and each node calculates circuit overload consequence I_{S, ci}With out-of-limit consequence I of node voltage_{V, cj}, its In, circuit overload consequence and the out-of-limit consequence of node voltage are expressed as：

Index output unit, the trend for calculating i-th line road transship risk index R_{S, ci}With the voltage of j-th node Out-of-limit risk index R_{V, cj}, wherein, R_{S, ci}And R_{V, cj}It is expressed as：

R_S,ci=P_c·I_S,ci

R_V,cj=P_c·I_V,cj

P_cFor the probability that forecast failure accident occurs.

With reference to the first possible embodiment of second aspect, second of second aspect is embodiments provided Possible embodiment, wherein, said apparatus also include：Voltage limit risk computing module, for the electricity of calculating simulation electrical network Out-of-limit risk is pressed, judges whether voltage limit risk exceedes risk threshold value set in advance, if it is, will be beyond the risk threshold The information of value is sent to power system monitor personnel；Wherein, the voltage limit risk of the simulating grid is expressed as：

n_bNumber of nodes in expression accident set；n_cThe quantity of the forecast failure included for accident set.

With reference to second aspect, the third possible embodiment of second aspect is embodiments provided, wherein, on Stating device also includes：Load cuts down risk schedule computing module, cuts down wind for load during calculating simulation grid collapses Dangerous consequence, and load reduction risk schedule is sent to into power system monitor personnel, to instruct the scheduling operation of power system monitor personnel, its In, it is that the risk after the given load of simulating grid is cut off under relay protection or manual control refers to that load cuts down risk schedule Number, is expressed as：

Wherein, v is the interstitial content that load is cut down, L occur_jFor the load reduction of j-th load reduction node, a_jFor The important coefficient of the load of j-th load reduction node, wherein, the important coefficient of load is determined by load level.

The embodiment of the present invention brings following beneficial effect：

Power grid accident method for prewarning risk provided in an embodiment of the present invention and device, by setting up accident set, and calculate thing Therefore concentrate the trend of each circuit to transship risk index, and the voltage limit risk of the node associated with described each circuit is referred to Number, and be compared with corresponding risk setting range, can close by the circuit beyond risk setting range and with the circuit The node of connection is sent to power system monitor personnel, makes the risk class of the clear and definite power grid accident of power system monitor personnel, contributes to scheduling and determines Plan department is scheduled operation according to the operating personnel that comparative result reasonable arrangement has different levels scheduling experience, in optimization people While member's configuration, the efficiency of scheduling operation is also improved, guarantee is provided for power network safety operation.

Other features and advantages of the present invention will be illustrated in the following description, also, partly be become from specification Obtain it is clear that or being understood by implementing the present invention.The purpose of the present invention and other advantages are in specification, claims And in accompanying drawing specifically noted structure realizing and obtain.

To enable the above objects, features and advantages of the present invention to become apparent, preferred embodiment cited below particularly, and coordinate Appended accompanying drawing, is described in detail below.

Description of the drawings

In order to be illustrated more clearly that the specific embodiment of the invention or technical scheme of the prior art, below will be to concrete Needed for embodiment or description of the prior art, accompanying drawing to be used is briefly described, it should be apparent that, in describing below Accompanying drawing is some embodiments of the present invention, for those skilled in the art, on the premise of not paying creative work, Can be with according to these other accompanying drawings of accompanying drawings acquisition.

Fig. 1 is a kind of flow chart of power grid accident method for prewarning risk provided in an embodiment of the present invention；

Fig. 2 is index calculating concrete grammar flow chart in power grid accident method for prewarning risk provided in an embodiment of the present invention；

Fig. 3 is a kind of structural representation of power grid accident Risk-warning device provided in an embodiment of the present invention；

Fig. 4 is the structural representation of index computing module in power grid accident Risk-warning device provided in an embodiment of the present invention Figure.

Specific embodiment

To make purpose, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with accompanying drawing to the present invention Technical scheme be clearly and completely described, it is clear that described embodiment is a part of embodiment of the invention, rather than Whole embodiments.Based on the embodiment in the present invention, those skilled in the art institute under the premise of creative work is not made The every other embodiment for obtaining, belongs to the scope of protection of the invention.

At present as dispatching of power netwoks behavior itself can receive the impact of uncertain factor, cause electrical network decision-making section to accident Risk class is indefinite, often makes the scheduling operation not being inconsistent with actual accidents, based on this, provided in an embodiment of the present invention one Power grid accident method for prewarning risk and device are planted, to alleviate due to making and actual accidents to the indefinite of accident risk grade The risk scheduling operation not being inconsistent and technical problem that risk is brought to electric power netting safe running.

It is for ease of understanding to the present embodiment, pre- to a kind of power grid accident risk disclosed in the embodiment of the present invention first Alarm method describes in detail.

Embodiment one：

The flow chart that Fig. 1 shows a kind of power grid accident method for prewarning risk provided in an embodiment of the present invention.The method bag Include following steps：

Step S102, obtains the line information of each circuit in simulating grid, target line is chosen from line information；

Wherein, above-mentioned simulating grid is with the corresponding mode dry run of forecast failure, and target line is forecast failure institute Circuit.

Step S104, extract target line configuration data, in configuration data search target line key equipment and The nodal information associated with target line；

Step S106, is scanned for centered on the key equipment of the target line and target line of selection, sets up thing Gu Ji；

Wherein, the accident set includes that the key equipment with target line and target line has the circuit and section of same node point Point.When implementing, BFS can be carried out centered on target line and key equipment, for example, it is assumed that search Depth is N, will search circuit as accident set C₀, as N=1, have identical section with target line and key equipment all The circuit of point adds accident set C₀；During N=2, the circuit that the circuit searched during all and N=1 has same node point adds thing Therefore collection C₀；N=3, when 4 ..., by that analogy.The use of BFS is that as forecast failure circuit is more remote, then which sends thing Therefore the impact to the operation is less, and hence it is also possible to computational accuracy is improved by the value for heightening N, based on this, above-mentioned accident set The advantage of analysis method is to cover the branch road and node affected by operation, it is ensured that the accuracy of risk assessment, while The settlement efficiency of risk assessment is can guarantee that, the requirement of real-time of application on site is met.

Step S108, the trend overload risk index of each circuit in calculating accident set, and associate with each circuit The voltage limit risk index of node；

Step S110, the voltage of the node associated by the trend overload risk index of each circuit and with each circuit are got over Limit risk index is compared with corresponding risk setting range respectively；

Comparative result beyond corresponding risk setting range is sent to power system monitor personnel by step S112.

Power grid accident method for prewarning risk provided in an embodiment of the present invention, by setting up accident set, and calculates in accident set The trend overload risk index of each circuit, and the voltage limit risk index of the node associated with described each circuit, and It is compared with corresponding risk setting range, the section that can be associated by the circuit beyond risk setting range and with the circuit Point is sent to power system monitor personnel, makes the risk class of the clear and definite power grid accident of power system monitor personnel, contributes to scheduling decision department The operating personnel according to comparative result reasonable arrangement with different levels scheduling experience are scheduled operation, in optimization personnel depaly While, the efficiency of scheduling operation is also improved, and guarantee is provided for power network safety operation.

Fig. 2 shows the concrete calculating process of above-mentioned steps S108, as shown in Fig. 2 the concrete calculating process include it is following Step：

Step S202, when forecast failure occurs, calculates the trend overload factor and each section of each circuit in accident set The voltage out-of-limit coefficient of point；

Wherein, the trend overload factor of each circuit is expressed as：

I refers to the i-th line road of the accident set, and c is forecast failure accident, S_ciFor the apparent energy on i-th line road, S_iN It is the rated power on i-th line road；

The voltage out-of-limit coefficient of each node is expressed as：

J is j-th node associated with i-th line road in accident set, U_cjIt is the voltage magnitude of j-th node, U_inf,jWith U_sup,jIt is the higher limit and lower limit of the voltage of j-th node permission.

Step S204, calculates circuit mistake according to the voltage out-of-limit coefficient of the trend overload factor and each node of each circuit Carry consequence and the out-of-limit consequence of node voltage；

Wherein, circuit overload consequence I_{S, ci}With out-of-limit consequence I of node voltage_{V, cj}, can be expressed as：

Step S206, the trend for calculating i-th line road using the result of calculation of step S204 transship risk index and j-th The voltage limit risk index of node.

Wherein, trend overload risk index R_{S, ci}With voltage limit risk index R_{V, cj}It is expressed as：

R_S,ci=P_c·I_S,ci

R_V,cj=P_c·I_V,cj

P_cFor the probability that forecast failure accident occurs.

On the one hand, the result of calculation according to above-mentioned Fig. 2 steps, said method also include：When the quantity of forecast failure is many When individual, the trend overload risk index R on i-th line road under multiple forecast failures is calculated_{S, i}With the voltage out-of-limit wind of j-th node Dangerous index R_{V, j}, it is expressed as：

Wherein, n_cThe quantity of the forecast failure included for accident set；That is, the trend overload risk to each forecast failure Index and voltage limit risk index carry out read group total, draw under multiple forecast failures, the trend overload risk of every circuit Index and voltage limit risk index.

Further, the trend overload risk index of each circuit for including to accident set is ranked up, and draws ranking results, Trend overload risk index highest circuit is selected from ranking results, sector-style is entered to trend overload risk index highest circuit Danger controls；And/or, the voltage limit risk index of each node included to accident set is ranked up, and draws ranking results, from Voltage limit risk index highest node is selected in ranking results, risk is carried out to voltage limit risk index highest node Control.

On the other hand, the result of calculation according to above-mentioned Fig. 2 steps, said method also include：

The voltage for calculating trend overload risk index that each forecast failure causes and the node caused by forecast failure is got over Limit risk index, wherein, the trend overload risk index R that each forecast failure causes_{S, c}Represent, voltage limit risk index Use R_{V, c}Represent：

That is, the number of, lines and number of nodes being related to forecast failure is sued for peace, to draw the shadow of each forecast failure Snap number, to draw the accident for causing greatest risk.Wherein, n_lAnd n_bRespectively represent accident set in number of, lines and nodes Amount.

Further, the trend overload risk index for causing to each forecast failure is ranked up, and draws ranking results, from row Trend overload risk index highest forecast failure is selected in sequence result, trend overload risk index highest forecast failure is entered Row risk control；And/or, the voltage limit risk index of the node caused to forecast failure is ranked up, and draws ranking results, Voltage limit risk index highest forecast failure is selected from ranking results, to the anticipation event of voltage limit risk index highest Barrier carries out risk control.

Except the above-mentioned number of, lines and number of nodes being related to forecast failure quantity and to forecast failure is sued for peace respectively, Voltage limit risk index of the said method also including calculating simulation electrical network, judges whether voltage limit risk index exceedes advance The risk threshold value of setting, if it is, the information beyond risk threshold value is sent to power system monitor personnel；Wherein, simulating grid Voltage limit risk exponential representation is：

n_bNumber of nodes in expression accident set；n_cThe quantity of the forecast failure included for accident set.

The R of above-mentioned calculating_VRepresent be simulating grid circuit in total voltage limit risk index, got over using the voltage Limit risk index, power system monitor personnel are known that the circuit risk of power system whether beyond acceptable scope, so as to can To decide whether to perform scheduling operation, or the operating personnel of which level scheduling experience are arranged to be scheduled operation.

Further, said method also includes：Load during calculating simulation grid collapses cuts down risk schedule, and will be negative Lotus is cut down risk schedule and is sent to the power system monitor personnel, to instruct the scheduling operation of power system monitor personnel, wherein, load is cut It is the risk index after the given load of simulating grid is cut off under relay protection or manual control to subtract risk schedule, is represented For：

Wherein, v is the interstitial content that load is cut down, L occur_jFor the load reduction of j-th load reduction node, a_jFor The important coefficient of the load of j-th load reduction node, wherein, the important coefficient of load is determined by load level.Specifically When realizing, for load cuts down risk indicator, bus loss of pressure is only caused under the extreme case of operation failure, can just cause to bear Lotus is cut down, therefore, load is cut down and is only derived from operation failure, to reduce the loss that operation failure brings.

Embodiment two：

On the basis of above-described embodiment, the embodiment of the present invention additionally provides a kind of power grid accident Risk-warning device, such as Shown in Fig. 3, the device includes：

Target line chooses module 30, for obtaining the line information of each circuit in simulating grid, from line information Choose target line；Wherein, with the corresponding mode dry run of forecast failure, target line is the forecast failure to simulating grid The circuit at place；

Information searching module 31, for extracting the configuration data of target line, searches target line in configuration data Key equipment and the nodal information associated with target line；

Accident set sets up module 32, carries out centered on the key equipment for target line and target line to choose Search, sets up accident set, wherein, accident set includes that the key equipment with target line and target line has the line of same node point Road and node；

Index computing module 33, for calculate each circuit in accident set trend transship risk index, and and each The voltage limit risk index of the node of circuit association；

Index comparison module 34, the node associated by the trend overload risk index of each circuit and with each circuit Voltage limit risk index is compared with corresponding risk setting range respectively；

As a result sending module 35, for the comparative result beyond corresponding risk setting range is sent to power system monitor people Member.

Power grid accident Risk-warning device provided in an embodiment of the present invention, by setting up accident set, and calculates in accident set The trend overload risk index of each circuit, and the voltage limit risk index of the node associated with described each circuit, and It is compared with corresponding risk setting range, the section that can be associated by the circuit beyond risk setting range and with the circuit Point is sent to power system monitor personnel, makes the risk class of the clear and definite power grid accident of power system monitor personnel, contributes to scheduling decision department The operating personnel according to comparative result reasonable arrangement with different levels scheduling experience are scheduled operation, in optimization personnel depaly While, the efficiency of scheduling operation is also improved, and guarantee is provided for power network safety operation.

During Fig. 4 shows power grid accident Risk-warning device provided in an embodiment of the present invention, index computing module it is concrete Structural representation, the module include：

First computing unit 331, for when forecast failure occurs, calculating the trend overload system of each circuit in accident set The voltage out-of-limit coefficient of number and each node；Wherein, the trend overload factor of each circuit is expressed as：

I refers to the i-th line road of accident set, and c is forecast failure accident, S_ciFor the apparent energy on i-th line road, S_iNIt is i-th The rated power of bar circuit；

The voltage out-of-limit coefficient of each node is expressed as：

J is j-th node associated with i-th line road in accident set, U_cjIt is the voltage magnitude of j-th node, U_inf,jWith U_sup,jIt is the higher limit and lower limit of the voltage of j-th node permission；

Second computing unit 332, for the trend overload factor according to each circuit and the voltage out-of-limit system of each node Number calculates circuit overload consequence I_{S, ci}With out-of-limit consequence I of node voltage_{V, cj}, wherein, circuit overload consequence and node voltage it is out-of-limit after Fruit is expressed as：

Index output unit 333, the trend for calculating i-th line road transship risk index R_{S, ci}With j-th node Voltage limit risk index R_{V, cj}, wherein, the R_{S, ci}With the R_{V, cj}It is expressed as：

R_S,ci=P_c·I_S,ci

R_V,cj=P_c·I_V,cj

P_cFor the probability that forecast failure accident occurs.

Further, said apparatus also include：Voltage limit risk computing module (not shown in Fig. 3), for calculating simulation The voltage limit risk of electrical network, judges whether voltage limit risk exceedes risk threshold value set in advance, if it is, will be beyond wind The information of dangerous threshold value is sent to power system monitor personnel；Wherein, the voltage limit risk of simulating grid is expressed as：

n_bNumber of nodes in expression accident set；n_cThe quantity of the forecast failure included for accident set.

Further, said apparatus also include：Load cuts down risk schedule computing module (not shown in Fig. 3), for calculating Load when simulating grid breaks down cuts down risk schedule, and load reduction risk schedule is sent to power system monitor personnel, To instruct the scheduling operation of power system monitor personnel, wherein, it is under relay protection or manual control that load cuts down risk schedule Risk index after the given load of excision simulating grid, is expressed as：

Wherein, v is the interstitial content that load is cut down, L occur_jFor the load reduction of j-th load reduction node, a_jFor The important coefficient of the load of j-th load reduction node, wherein, the important coefficient of load is determined by load level.

Power grid accident Risk-warning device provided in an embodiment of the present invention, the power grid accident risk provided with above-described embodiment Method for early warning has identical technical characteristic, so can also solve identical technical problem, reaches identical technique effect.

Those skilled in the art can be understood that, for convenience and simplicity of description, the device of foregoing description Specific work process, may be referred to the corresponding process in preceding method embodiment, will not be described here.

If the function is realized using in the form of SFU software functional unit and as independent production marketing or when using, can be with It is stored in a computer read/write memory medium.Based on such understanding, technical scheme is substantially in other words The part contributed to prior art or the part of the technical scheme can be embodied in the form of software product, the meter Calculation machine software product is stored in a storage medium, is used including some instructions so that a computer equipment (can be individual People's computer, server, or network equipment etc.) perform all or part of step of each embodiment methods described of the invention. And aforesaid storage medium includes：USB flash disk, portable hard drive, read-only storage (ROM, Read-Only Memory), arbitrary access are deposited Reservoir (RAM, Random Access Memory), magnetic disc or CD etc. are various can be with the medium of store program codes.

Finally it should be noted that：Above example, specific embodiment only of the invention, to the skill for illustrating the present invention Art scheme, rather than a limitation, protection scope of the present invention is not limited thereto, skilled artisan would appreciate that：It is any Those familiar with the art the invention discloses technical scope in, which still can be to described in previous embodiment Technical scheme modify or can readily occur in change, or equivalent is carried out to which part technical characteristic；And these Modification, change are replaced, and do not make the essence of appropriate technical solution depart from the spirit and model of embodiment of the present invention technical scheme Enclose, should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with scope of the claims It is defined.

Claims (10)

1. a kind of power grid accident method for prewarning risk, it is characterised in that include：

The line information of each circuit in simulating grid is obtained, and target line is chosen from the line information；Wherein, the mould Intend electrical network with the corresponding mode dry run of forecast failure, the target line is the circuit that the forecast failure is located；

Extract the configuration data of the target line, search in the configuration data target line key equipment and with The nodal information of the target line association；

Scanned for centered on the key equipment of the target line and the target line of selection, set up accident set, Wherein, the accident set include the key equipment with the target line and the target line have the circuit of same node point and Node；

Calculate the trend overload risk index of each circuit in the accident set, and the node that associates with described each circuit Voltage limit risk index；

The voltage out-of-limit wind of the node associated by the trend overload risk index of each circuit and with described each circuit Dangerous index is compared with corresponding risk setting range respectively；

Comparative result beyond the corresponding risk setting range is sent to into power system monitor personnel.

2. method according to claim 1, it is characterised in that calculate the trend overload wind of each circuit in the accident set Dangerous index, and the voltage limit risk index of the node associated with described each circuit included：

When the forecast failure occurs, the trend overload factor and described each node of each circuit in the accident set are calculated Voltage out-of-limit coefficient；Wherein, the trend overload factor of each circuit is expressed as：

$K_{S,ci}=\left\{\begin{array}{cc}0& S_{ci}\≤S_{iN}\\ (S_{ci}/S_{iN}-1)& S_{ci}>S_{iN}\end{array}\right.$

Wherein, i refers to the i-th line road of the accident set, and c is forecast failure accident, S_ciFor the apparent energy on i-th line road, S_iN It is the rated power on i-th line road；

The voltage out-of-limit coefficient of each node is expressed as：

$K_{V,cj}=\left\{\begin{array}{cc}{U}_{\inf ,j}-U_{cj}& U_{cj}\&le;U_{\inf ,j}\\ 0& U_{\inf ,j}<U_{cj}<U_{\sup ,j}\\ U_{cj}-U_{\sup ,j}& U_{cj}\&GreaterEqual;U_{\sup ,j}\end{array}\right.$

J is j-th node associated with the i-th line road in the accident set, U_cjIt is the voltage amplitude of j-th node Value, U_inf,jAnd U_sup,jIt is the higher limit and lower limit of the voltage that j-th node is allowed；

Calculated after circuit overload according to the voltage out-of-limit coefficient of the trend overload factor and each node of each circuit Fruit I_{S, ci}With out-of-limit consequence I of node voltage_{V, cj}, wherein, the circuit overload consequence and the out-of-limit consequence of node voltage are represented respectively For：

$I_{S,ci}=e^{K_{S,ci}}-1$

$I_{V,cj}=e^{K_{V,cj}}-1$

Calculate the trend overload risk index R on the i-th line road_{S, ci}With the voltage limit risk index of j-th node R_{V, cj}, wherein, the R_{S, ci}With the R_{V, cj}It is expressed as：

R_S,ci=P_c·I_S,ci

R_V,cj=P_c·I_V,cj

P_cFor the probability that the forecast failure accident occurs.

3. method according to claim 2, it is characterised in that methods described also includes：

When the quantity of the forecast failure is multiple, the trend overload wind on i-th line road under multiple forecast failures is calculated Dangerous index R_{S, i}With the voltage limit risk index R of j-th node_{V, j}, it is expressed as：

$R_{S,i}=\underset{c=1}{\overset{n_c}{\mathrm{\&Sigma;}}}{R}_{S,ci}$

$R_{V,j}=\underset{c=1}{\overset{n_c}{\mathrm{\&Sigma;}}}{R}_{V,cj}$

Wherein, n_cThe quantity of the forecast failure included for the accident set；

The trend overload risk index of each circuit included to the accident set is ranked up, and draws ranking results, from described The trend overload risk index highest circuit is selected in ranking results, risk index highest circuit is transshipped to the trend Carry out risk control；And/or,

The voltage limit risk index of each node included to the accident set is ranked up, and draws ranking results, from described The voltage limit risk index highest node is selected in ranking results, to the voltage limit risk index highest node Carry out risk control.

4. method according to claim 2, it is characterised in that methods described also includes：

The voltage for calculating trend overload risk index that each forecast failure causes and the node caused by the forecast failure is got over Limit risk index, wherein, the trend overload risk index R that each forecast failure causes_{S, c}Represent, the forecast failure causes Node voltage limit risk index R_{V, c}Represent：

$R_{S,c}=\underset{i=1}{\overset{n_l}{\mathrm{\&Sigma;}}}{R}_{S,ci}$

$R_{V,c}=\underset{j=1}{\overset{n_b}{\mathrm{\&Sigma;}}}{R}_{V,cj}$

Wherein, n_lAnd n_bThe number of, lines and number of nodes in the accident set is represented respectively；

The trend overload risk index caused to described each forecast failure is ranked up, and draws ranking results, from the sequence As a result it is middle to select the trend to transship risk index highest forecast failure, to trend overload risk index highest anticipation Failure carries out risk control；And/or,

The voltage limit risk index of the node caused to the forecast failure is ranked up, and draws ranking results, from the row The voltage limit risk index highest forecast failure is selected in sequence result, it is pre- to the voltage limit risk index highest Think that failure carries out risk control.

5. method according to claim 2, it is characterised in that methods described also includes：

The voltage limit risk index of the simulating grid is calculated, is judged whether the voltage limit risk index exceedes and is set in advance Fixed risk threshold value, if it is, the information beyond the risk threshold value is sent to power system monitor personnel；Wherein, the simulation The voltage limit risk exponential representation of electrical network is：

$R_V=\underset{j=1}{\overset{n_b}{\mathrm{\&Sigma;}}}\underset{c=1}{\overset{n_c}{\mathrm{\&Sigma;}}}{R}_{V,cj}$

Wherein, n_bRepresent the number of nodes in the accident set；n_cThe quantity of the forecast failure included for the accident set.

6. it is according to claim 1, it is characterised in that methods described also includes：

Calculate the load when simulating grid breaks down and cut down risk schedule, and the load is cut down into risk schedule and send To the power system monitor personnel, to instruct the scheduling operation of the power system monitor personnel, wherein, the load cuts down risk schedule It is the risk index after the given load of the simulating grid is cut off under relay protection or manual control, is expressed as：

$I_L=\underset{j=1}{\overset{v}{\mathrm{\&Sigma;}}}{a}_j{L}_j$

Wherein, v is the interstitial content that load is cut down, L occur_jFor the load reduction of j-th load reduction node, a_jFor j-th Load cuts down the important coefficient of the load of node, wherein, the important coefficient of the load is determined by load level.

7. a kind of power grid accident Risk-warning device, it is characterised in that include：

Target line chooses module, for obtaining the line information of each circuit in simulating grid, selects from the line information Take target line；Wherein, with the corresponding mode dry run of forecast failure, the target line is described pre- to the simulating grid Think the circuit of guilty culprit；

Information searching module, for extracting the configuration data of the target line, searches the target in the configuration data The key equipment of circuit and the nodal information associated with the target line；

Accident set sets up module, enters centered on the key equipment for the target line and the target line to choose Line search, sets up accident set, wherein, the accident set includes the key equipment with the target line and the target line There are the circuit and node of same node point；

Index computing module, the trend for calculating each circuit in the accident set transship risk index, and every with described The voltage limit risk index of the node of individual circuit association；

Index comparison module, the node associated by the trend overload risk index of each circuit and with described each circuit Voltage limit risk index be compared with corresponding risk setting range respectively；

As a result sending module, for the comparative result beyond the corresponding risk setting range is sent to power system monitor people Member.

8. device according to claim 7, it is characterised in that the index computing module includes：

First computing unit, for when the forecast failure occurs, calculating the trend overload of each circuit in the accident set The voltage out-of-limit coefficient of coefficient and each node；Wherein, the trend overload factor of each circuit is expressed as：

$K_{S,ci}=\left\{\begin{array}{cc}0& S_{ci}\&le;S_{iN}\\ (S_{ci}/S_{iN}-1)& S_{ci}>S_{iN}\end{array}\right.$

I refers to the i-th line road of the accident set, and c is forecast failure accident, S_ciFor the apparent energy on i-th line road, S_iNIt is i-th The rated power of bar circuit；

The voltage out-of-limit coefficient of each node is expressed as：

$K_{V,cj}=\left\{\begin{array}{cc}{U}_{\inf ,j}-U_{cj}& U_{cj}\&le;U_{\inf ,j}\\ 0& U_{\inf ,j}<U_{cj}<U_{\sup ,j}\\ U_{cj}-U_{\sup ,j}& U_{cj}\&GreaterEqual;U_{\sup ,j}\end{array}\right.$

J is j-th node associated with the i-th line road in the accident set, U_cjIt is the voltage amplitude of j-th node Value, U_inf,jAnd U_sup,jIt is the higher limit and lower limit of the voltage that j-th node is allowed；

Second computing unit, for the voltage out-of-limit system of trend overload factor and each node according to each circuit Number calculates circuit overload consequence I_{S, ci}With out-of-limit consequence I of node voltage_{V, cj}, wherein, the circuit overload consequence and node voltage are got over Limit consequence is expressed as：

$I_{S,ci}=e^{K_{S,ci}}-1$

$I_{V,cj}=e^{K_{V,cj}}-1$

Index output unit, the trend for calculating the i-th line road transship risk index R_{S, ci}With j-th node Voltage limit risk index R_{V, cj}, wherein, the R_{S, ci}With the R_{V, cj}It is expressed as：

R_S,ci=P_c·I_S,ci

R_V,cj=P_c·I_V,cj

P_cFor the probability that the forecast failure accident occurs.

9. device according to claim 8, it is characterised in that described device also includes：

Voltage limit risk computing module, for calculating the voltage limit risk of the simulating grid, judges the voltage out-of-limit Whether risk exceedes risk threshold value set in advance, if it is, the information beyond the risk threshold value is sent to power system monitor Personnel；Wherein, the voltage limit risk of the simulating grid is expressed as：

$R_V=\underset{j=1}{\overset{n_b}{\mathrm{\&Sigma;}}}\underset{c=1}{\overset{n_c}{\mathrm{\&Sigma;}}}{R}_{V,cj}$

n_bRepresent the number of nodes in the accident set；n_cThe quantity of the forecast failure included for the accident set.

10. device according to claim 7, it is characterised in that described device also includes：

Load cuts down risk schedule computing module, cuts down after risk for calculating the load when simulating grid breaks down Really, and by the load reduction risk schedule power system monitor personnel are sent to, to instruct the tune of the power system monitor personnel Degree operation, wherein, it is that the simulating grid is cut off under relay protection or manual control that the load cuts down risk schedule Risk index after given load, is expressed as：

$I_L=\underset{j=1}{\overset{v}{\mathrm{\&Sigma;}}}{a}_j{L}_j$

Wherein, v is the interstitial content that load is cut down, L occur_jFor the load reduction of j-th load reduction node, a_jFor j-th Load cuts down the important coefficient of the load of node, wherein, the important coefficient of the load is determined by load level.