CN105391050A - Checking method and system of high-cycle cutting machine configuration scheme - Google Patents
Checking method and system of high-cycle cutting machine configuration scheme Download PDFInfo
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- CN105391050A CN105391050A CN201510718677.3A CN201510718677A CN105391050A CN 105391050 A CN105391050 A CN 105391050A CN 201510718677 A CN201510718677 A CN 201510718677A CN 105391050 A CN105391050 A CN 105391050A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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Abstract
The present invention provides a checking method and system of a high-cycle cutting machine configuration scheme of a multi-DC feed asynchronous operation grid. According to the checking method, through using simulation model simulation, the condition of a grid system after a fault in a forecast fault set happens is calculated to obtain a simulation calculation result, the forecast fault set comprises a traditional grid external feed section breaking fault and also comprises the influence of a non-synchronous operation grid fault on a researched grid frequency, and the high-cycle cutting machine configuration scheme can be checked and corrected so as to obtain a scheme which satisfies a configured multi-DC feed asynchronous operation grid operation requirement. According to the checking method of the high-cycle cutting machine configuration scheme of the multi-DC feed asynchronous operation grid, the factor consideration is comprehensive, the operability is strong, the practical value is high, and the market prospect is good.
Description
Technical field
The present invention relates to field of power system control, particularly relate to check method and the system of cutting machine configuration height week that a kind of many direct currents send asynchronous operation electrical network.
Background technology
Along with direct current transmission power is increasing, it is more and more outstanding that AC/DC parallel runs the system safety stable operation risk brought.For avoiding occurring large area blackout during electrical network generation multiple faults, progressively consider in Electric Power Network Planning to implement asynchronous interconnected network, namely between two AC system without alternating current interconnection, and be connected by means of only DC line, two intrasystem generator amatures are without the need to keeping synchronous.Though asynchronous interconnected network greatly improves system transient modelling angle stability problem, but due to the electrical network of script synchronous operation, after employing Asynchronous Interconnection mode is divided into the electrical network that some scales are less, the ability that single electrical network independently resists power disturbance declines, the unit of non-faulting electrical network cannot participate in the primary frequency modulation of faulty grids directly, be unfavorable for the fluctuation of blanketing frequency, frequency stabilization outstanding problem.
High week cut machine and belong to three lines of defence category, cutting machine high week for the configuration of sending end electrical network is the important technique measure solving frequency control problem when sending end electrical network Transmission Corridor disconnects, especially the weak sending end asynchronous operation electrical network that large for direct current transmission power, power system capacity is little, cut that machine arrangements is improper may exist following problem high week:
(1) when sending direct current generation locking outside, because there is power surplus after fault instantaneously, frequency raises sending end electrical network, for the locking of single time high-capacity direct current generation one pole, according to " guiding rules of power system safety and stability (DL755-2001) ", system can not take stability contorting measure, sending end electrical network may cause high week to cut the action of the machine first round because frequency raises, and does not meet the safety and stability standard that electrical network bears large disturbances ability;
(2) comparatively serious conditions is considered, when sending direct current many times locking simultaneously outside and stability control device tripping, sending end electrical network because of power surplus serious, if it is inadequate to cut machine configuration amount sending end electrical network height week, the transient process medium frequency higher duration is longer, may cause the unordered action of fired power generating unit overspeed protection;
(3) receiving end electric network fault causes in sending end power grid multi-circuit direct current commutation failure process, sending end electrical network may cause cutting machine action high week because frequency raises, when failure vanishes direct current power is recovered gradually, sending end electrical network frequency reduction can cause low frequency load shedding equipment action because of power shortage again.
Summary of the invention
Based on this, be necessary check method and the system to cutting machine configuration the height week providing a kind of many direct currents to send asynchronous operation electrical network.
Many direct currents send the check method cutting machine allocation plan height week of asynchronous operation electrical network, comprising:
Set up and send simulation model corresponding to asynchronous operation electrical network with many direct currents to be configured;
Simulation model carries out Load flow calculation and determines operational mode to be studied;
According to waiting that checking high week cuts machine allocation plan, after there is the fault in forecast failure collection in simulation calculation simulation model under operational mode to be studied network system frequency characteristic and cut machine, low-frequency load reduction action situation height week, obtain simulation result;
Judge whether simulation result meets pre-conditioned;
If so, then determine to wait to check that to cut machine allocation plan high week be meet many direct currents to be configured to send the scheme that asynchronous operation operation of power networks requires;
If not, then according to simulation result correction to be checked height week cut machine allocation plan obtain revise height week cut machine allocation plan, is cut machine allocation plan the height week of correction as waiting that checking high week cuts machine allocation plan, returns the step of simulation calculation.
Wherein in a kind of execution mode, before the step of simulation calculation, also comprise:
Set up forecast failure collection, forecast failure collection comprises: many direct currents are sent asynchronous operation electrical network and sent the simultaneously one pole locking of the locking of direct current generation one pole, multiple direct current, the tripping of single DC bipolar block stability control device and the tripping of multiple direct current locking simultaneously stability control device outside, and receiving end electric network fault causes many direct currents and sends asynchronous operation electrical network and send multiple-circuit line commutation failure outside.
Wherein in a kind of execution mode, simulation model carries out Load flow calculation and determines that the step of operational mode to be studied is specially:
Adopt Newton-Raphson approach to carry out Load flow calculation and determine operational mode to be studied, operational mode comprise that regional power grid start is maximum and the start of the operational mode that load is maximum, regional power grid is maximum and in operational mode that between operational mode that load is minimum and regional power grid net, transmitted power is maximum any one or multiple.
Wherein in a kind of execution mode, according to waiting that checking high week cuts machine allocation plan, there is the frequency characteristic of the fault post-simulation model in fault set and height week cuts machine, low-frequency load reduction action situation obtains simulation result step under simulation calculation operational mode, be specially:
The direct current sending end that puts into operation frequency limitation device, adopt implicit expression trapezoid numerical integration algorithm, after there is each fault in forecast failure collection under the operational mode that simulation calculation is to be studied network system frequency characteristic and cut machine, low-frequency load reduction action situation height week, obtain simulation result.
Wherein in a kind of execution mode, high week cut machine scheme and comprise: cut motor-driven work wheel level high week, each takes turns initiation culture, each takes turns action delay definite value and each round cut machine amount.
Many direct currents send the nucleus correcting system cutting machine allocation plan height week of asynchronous operation electrical network, comprising:
Modeling and simulating module, sends simulation model corresponding to asynchronous operation electrical network for setting up with many direct currents to be configured;
Load flow calculation module, determines operational mode to be studied for carrying out Load flow calculation on simulation model;
Simulation algorithm model, wait that checking high week cuts machine allocation plan for basis, after there is the fault in forecast failure collection in simulation calculation simulation model under operational mode to be studied network system frequency characteristic and cut machine, low-frequency load reduction action situation height week, obtain simulation result;
Judge module, pre-conditioned for judging whether simulation result meets;
Correcting module, for when the result of determination of judge module is no, that cuts that machine allocation plan obtains revising the height week to be checked according to simulation result correction cuts machine allocation plan in check height week, and is cut machine allocation plan the height week of correction and cut machine allocation plan high week export to simulation algorithm model as waiting to check;
Allocation plan determination module, for when the result of determination of judge module is for being, determines to wait to check that to cut machine allocation plan high week be meet many direct currents to be configured to send the scheme that asynchronous operation operation of power networks requires.
Wherein in a kind of execution mode, also comprise:
Forecast failure collection, forecast failure collection is set up in advance, comprise: many direct currents are sent asynchronous operation electrical network and sent the simultaneously one pole locking of the locking of direct current generation one pole, multiple direct current, the tripping of single DC bipolar block stability control device and the tripping of multiple direct current locking simultaneously stability control device outside, and receiving end electric network fault causes many direct currents and sends asynchronous operation electrical network and send multiple-circuit line commutation failure outside.
Wherein in a kind of execution mode, Load flow calculation module, specifically for adopting Newton-Raphson approach to carry out Load flow calculation and determine operational mode to be studied, operational mode comprise that regional power grid start is maximum and the start of the operational mode that load is maximum, regional power grid is maximum and in operational mode that between operational mode that load is minimum and regional power grid net, transmitted power is maximum any one or multiple.
Wherein in a kind of execution mode, simulation algorithm model, specifically for the direct current sending end frequency limitation device that puts into operation, adopt implicit expression trapezoid numerical integration algorithm, after there is each fault in forecast failure collection under the operational mode that simulation calculation is to be studied network system frequency characteristic and cut machine height week, low-frequency load reduction action situation obtains simulation result.
Wherein in a kind of execution mode, high week cut machine scheme and comprise: cut motor-driven work wheel level high week, each takes turns initiation culture, each takes turns action delay definite value and each round cut machine amount.
This many direct current sends the check method cutting machine allocation plan height week of asynchronous operation electrical network, after the fault concentrated by utilizing simulation model simulation calculation generation forecast failure, the situation of network system obtains simulation result, forecast failure collection is sent section outside cut-off except fault except being comprised traditional electrical network, also comprise asynchronous operation electric network fault to the impact of studied mains frequency, can check according to cutting machine allocation plan to high week and revise, send to be met many direct currents to be configured the scheme that asynchronous operation operation of power networks requires.This many direct current sends the check method cutting machine allocation plan height week of asynchronous operation electrical network, and Consideration is comprehensive, workable, has higher practical value and good market prospects.
Accompanying drawing explanation
Fig. 1 is the check method flow chart cutting machine allocation plan height week that a kind of many direct currents of execution mode send asynchronous operation electrical network;
Fig. 2 is the check method flow chart cutting machine allocation plan height week that a kind of many direct currents of execution mode send asynchronous operation electrical network;
Fig. 3 is the situation schematic diagram of Yunnan Power System electric power Transmission Corridor;
Fig. 4 is a kind of functional schematic of the direct current sending end frequency limitation device that puts into operation of execution mode;
Fig. 5 is the functional module signal of cutting the nucleus correcting system of machine allocation plan height week that a kind of many direct currents of execution mode send asynchronous operation electrical network;
Fig. 6 is the functional module signal of cutting the nucleus correcting system of machine allocation plan height week that many direct currents of another kind of execution mode send asynchronous operation electrical network.
Embodiment
As shown in Figure 1, check method height week cutting machine allocation plan that many direct currents send asynchronous operation electrical network comprises:
S101: set up and send simulation model corresponding to asynchronous operation electrical network with many direct currents to be configured.
Many direct currents send asynchronous operation electrical network, refer to that this area's electrical network and major network are without alternating current interconnection, are only connected with major network by multiple-circuit line.
Simulation model refers to the topological structure for simulating operation of power networks to be configured.Simulation model comprises the direct current detailed model considering DC control system, the machine unit speed regulating device model considering dead band and difference coefficient.Wherein, in machine unit speed regulating device model, dead band and difference coefficient adopt Multi simulation running simulation to obtain the parameter of closing to reality system operating characteristics.
S103: carry out Load flow calculation and determine operational mode to be studied on simulation model.
By carrying out Load flow calculation on simulation model, the limit operational mode that fully can expose stabilization of power grids problem to be configured is being selected to be operational mode to be studied.
S105: according to waiting that checking high week cuts machine allocation plan, after there is the fault in forecast failure collection in simulation calculation simulation model under operational mode to be studied network system frequency characteristic and cut machine, low-frequency load reduction action situation height week, obtain simulation result.
Wait that checking the parameter of cutting machine allocation plan high week comprises: cut motor-driven work wheel level high week, each takes turns initiation culture, each takes turns action delay definite value and each round cut machine amount.
S107: judge whether simulation result meets pre-conditioned.
If simulation result meets pre-conditioned, then think and this high week cut machine allocation plan and meet power grid security needs.
Pre-conditionedly to comprise:
Study in the frequency transient process of electrical network and be no more than 3s more than the 51.5Hz duration, avoid causing the unordered action of fired power generating unit overspeed protection; Study the frequency experience dynamic change of electrical network after the steady-state value that reaches between 49.2Hz to 50.5Hz; Study electrical network low cycles unloading device be failure to actuate; Study and high week cut machine under single direct current one pole latch status occurs electrical network and be failure to actuate, meet " guiding rules of power system safety and stability " requirement; And receiving end electric network fault is when causing studied electrical network to send multiple-circuit line commutation failure outside, study cut in electrical network height week machine be failure to actuate or actuating quantity as far as possible few, avoid cutting in high week the excessive causing trouble of machine actuating quantity disappear after low cycles unloading device action.
If the result of determination of step S107 is yes, then perform step:
S109: determine to wait to check that to cut machine allocation plan high week be meet many direct currents to be configured to send the scheme that asynchronous operation operation of power networks requires.
If the result of determination of S107 is no, namely simulation result does not meet pre-conditioned, then perform step:
S108: according to simulation result correction to be checked height week cut machine allocation plan obtain revise height week cut machine allocation plan, is cut machine allocation plan the height week of correction as waiting that checking high week cuts machine allocation plan, and returns step S105.
Revise and cut machine scheme high week and comprise that motor-driven work wheel level is cut in adjustment high week, each takes turns initiation culture, each takes turns action delay definite value and each round cut machine amount.
This many direct current sends the check method cutting machine allocation plan height week of asynchronous operation electrical network, after the fault concentrated by utilizing simulation model simulation calculation generation forecast failure, the situation of network system obtains simulation result, forecast failure collection is sent section outside cut-off except fault except being comprised traditional electrical network, also comprise asynchronous operation electric network fault to the impact of studied mains frequency, can check according to cutting machine allocation plan to high week and revise, send to be met many direct currents to be configured the scheme that asynchronous operation operation of power networks requires.This many direct current sends the check method cutting machine allocation plan height week of asynchronous operation electrical network, and Consideration is comprehensive, workable, has higher practical value and good market prospects.
In the execution mode that another is concrete, as shown in Figure 2, before or after step S103, also comprise step:
S104: set up forecast failure collection.
Forecast failure collection is set up in advance, comprises the catastrophe failure that many direct currents are sent the contingent catastrophe failure of asynchronous operation electrical network and occurred.
In a particular embodiment, fault in fault set comprises: many direct currents are sent asynchronous operation electrical network and sent the simultaneously one pole locking of the locking of direct current generation one pole, multiple direct current, the tripping of single DC bipolar block stability control device or the tripping of multiple direct current locking simultaneously stability control device outside, and receiving end electric network fault causes many direct currents and sends asynchronous operation electrical network and send multiple-circuit line commutation failure outside.
In another embodiment, step S103 is specially: adopt Newton-Raphson approach to carry out Load flow calculation and determine operational mode to be studied.
Operational mode comprise the start of regional power grid start maximum and the operational mode that load is maximum, regional power grid maximum and between operational mode that load is minimum and regional power grid net, transmitted power is maximum operational mode any one or multiple.
In another embodiment, step S105 is specially:
The direct current sending end that puts into operation frequency limitation device, adopt implicit expression trapezoid numerical integration algorithm, after there is each fault in forecast failure collection under the operational mode that simulation calculation is to be studied network system frequency characteristic and cut machine height week, low-frequency load reduction action situation obtains simulation result.The direct current sending end that puts into operation frequency limitation device as shown in Figure 4.
Simulation calculation in present embodiment considers that direct current sending end frequency limitation device drops into.For direct current a fairly large number of low capacity asynchronous operation electrical network, direct current frequency limitation function will play a significant role to mains frequency is stable, it can utilize the quick controllability of DC transmission system power, by responding system frequency change, regulate direct current transmission power, sending end (or receiving end) AC system frequency is made to remain on rated value (in the dead zone range of setting), therefore, the cooperation control cutting machine measure in direct current frequency limitation function and height week also becomes problem demanding prompt solution.
Frequency limitation device all has setting at direct current system two ends current conversion station, it is the quick controllability utilizing DC transmission system power, by responding system frequency change, regulate direct current transmission power, make sending end (or receiving end) AC system frequency remain on rated value (in the dead zone range of setting), major parameter comprises frequency dead band limited field, DC power modulation scope, proportional gain, storage gain.
This many direct current sends the check method cutting machine allocation plan height week of asynchronous operation electrical network, after the fault concentrated by utilizing simulation model simulation calculation generation forecast failure, the situation of network system obtains simulation result, direct current frequency limitation function and all cooperation control cutting machine measure of height is considered in simulation calculation, and forecast failure collection is sent section outside cut-off except fault except being comprised traditional electrical network, also comprise asynchronous operation electric network fault to the impact of studied mains frequency, can check according to cutting machine allocation plan to high week and revise, the scheme that asynchronous operation operation of power networks requires is sent to be met many direct currents to be configured.The check method Consideration cutting machine allocation plan height week that this many direct current sends asynchronous operation electrical network is comprehensive, workable, has higher practical value and good market prospects.
Carry out Simulation Evaluation to use check method of the present invention to cut machine allocation plan by Yunnan Power System a set of high week that Asynchronous Interconnection runs below, the inventive method is described in detail.Treating before Yunnan Power System Asynchronous Interconnection checks that high week to cut machine allocation plan as shown in table 1.
Treating before table 1 Yunnan Power System Asynchronous Interconnection is checked high week and is cut machine allocation plan
Steps A: set up the simulation model after Yunnan Power System and south electric network Asynchronous Interconnection.Generator model adopts " Eq " and " Ed " variation model considering time transient process, take into account the effect of governing system and excitation system, Large-scale machine set is considered to the effect of power system stabilizer, PSS, load adopts the integrated load model of 50% induction motor+50% constant-impedance, in machine unit speed regulating device model, dead band and difference coefficient adopt Multi simulation running simulation to obtain the parameter of closing to reality system operating characteristics, direct current system adopts the two ends direct current detailed model in BPA program, consider DC control system effect, DC control system adopts new model.
Step B: by Load flow calculation, selects the limit operational mode that fully can expose stabilization of power grids problem to be operational mode to be studied.Fig. 3 shows the situation schematic diagram of Yunnan Power System electric power Transmission Corridor, Yunnan Power System and south electric network are without alternating current interconnection, by means of only in gold, kwan-yin rock, western Shandong back-to-back DC be connected with Guangxi Power Grid, be connected with Guangdong Power Grid from direct current by Chu Sui, general emigrant, ox.Table 2 shows the basic operational mode of Yunnan Power System, choose the Yunnan Power System maximum and operational mode that load is maximum of start and Yunnan Power System start is maximum and operational mode that load is minimum, in two kinds of modes, Yunnan Power System sends that direct current is all fullly sent out outside, transmitted power is maximum between regional power grid net.
The basic operational mode of table 2 Yunnan Power System
Step C: set up forecast failure collection.Consider multiple-circuit line simultaneously locking and the probability of multiple-circuit line stabilized control system tripping simultaneously is simultaneously very low; forecast failure concentrates that the fault type of setting comprises the locking of single direct current one pole, single DC bipolar block surely controls tripping, two direct currents one pole lockings simultaneously, two direct currents simultaneously bipolar locking surely control tripping; and the tripping of receiving end power grid single-phase short circuit single-phase switch causes multiple-circuit line commutation failure; wherein for switch failure fault, after switch ma lf unction protection action, fault clearing time was checked by 0.35 second.
Step D: the post-fault system frequency characteristic in forecast failure collection occur under the operational mode that simulation calculation is studied and cuts machine, low-frequency load reduction action situation height week, obtaining simulation result.Consider the frequency limitation function that direct current is sent in Yunnan in simulation analysis, namely sending end frequency limitation function drops into, frequency dead band limited field ± 0.1Hz, DC power modulation scope is Pmodmin=-50%, Pmodmax=+20%, typical regulating parameter Kp=30, KI=22.2.Result of calculation is in shown in table 3 to table 4.
Table 3 Yunnan Power System is sent direct current locking outside and is surely controlled tripping result of calculation table
Table 4 receiving end electrical network AC fault causes multiple-circuit line commutation failure result of calculation table
In order to illustrate that direct current frequency limitation function sends the stable importance of asynchronous operation mains frequency to the many direct currents of maintenance, to the operational mode 1 in option table 2 not considering to have carried out simulation calculation under direct current frequency limitation function, the results are shown in Table shown in 5 and table 6.
When direct current frequency limitation function do not considered by table 5, Yunnan Power System is sent direct current locking outside and is surely controlled tripping result of calculation table
When direct current frequency limitation function do not considered by table 6, receiving end electrical network AC fault causes multiple-circuit line commutation failure result of calculation table
Step e: the simulation result obtained by step D can be found out, under above-mentioned failure mode, can find out:
(1), in Yunnan Power System transient process highest frequency is no more than 51.5Hz or is no more than 3s more than the 51.5Hz duration, can not cause the unordered action of fired power generating unit overspeed protection;
(2), recover frequency between 49.9Hz to 50.2Hz, meet system safety and stablize needs;
(3) under, not considering direct current frequency limitation function situation, when Yunnan Power System sends direct current generation one pole locking fault outside, highest frequency exceedes cuts the machine first round action definite value Yunnan height week, cut the action of machine automatic safety device high week, do not meet " guiding rules of power system safety and stability (DL755-2001) ";
(4), receiving end electrical network AC fault causes multiple-circuit line commutation failure, Yunnan Power System height week cuts motor-driven work, wherein do not considering in direct current frequency limitation function situation, after failure vanishes direct current power is recovered, Yunnan Power System frequency reduces and causes Yunnan low cycles unloading device action.
Step F: by the assessment result of step e, height week machine action is cut when sending direct current generation one pole locking fault outside to prevent Yunnan Power System, simultaneously in order to make receiving end electrical network AC fault cause Yunnan Power System in multiple-circuit line commutation failure process ensureing that cutting machine under the prerequisite that frequency characteristic does not worsen high week is failure to actuate or actuating quantity minimizing as far as possible, revise cutting machine allocation plan Yunnan Power System height week, correction height week to cut machine allocation plan as shown in table 7.
Table 7 Yunnan Power System revised high week cuts machine allocation plan
Return step D carry out simulation calculation to cutting machine allocation plan revised Yunnan Power System height week below, assess its adaptability, the results are shown in Table shown in 8 to table 10.
When direct current frequency limitation function do not considered by table 8, Yunnan Power System is sent direct current locking outside and is surely controlled tripping result of calculation table
When direct current frequency limitation function considered by table 9, Yunnan Power System is sent direct current locking outside and is surely controlled tripping result of calculation table
Table 10 receiving end electrical network AC fault causes multiple-circuit line commutation failure result of calculation table
Above-mentioned simulation result can be found out, revised Yunnan Power System height week cuts the full terms that machine allocation plan meets step e:
(1) study in the frequency transient process of electrical network and be no more than 3s more than the 51.5Hz duration;
(2) study the frequency experience dynamic change of electrical network after the steady-state value that reaches between 49.2Hz to 50.5Hz;
(3) study electrical network low cycles unloading device be failure to actuate;
(4) study and high week cut machine under single direct current one pole latch status occurs electrical network and be failure to actuate, meet " guiding rules of power system safety and stability " requirement;
(5) when receiving end electric network fault causes studied electrical network to send multiple-circuit line commutation failure outside, study cut in electrical network height week machine ensure to be failure to actuate under the prerequisite that mains frequency characteristic do not worsen study by institute or actuating quantity as far as possible few, avoid cutting the rear low cycles unloading device action of machine actuating quantity excessive causing trouble disappearance high week.
Step G: therefore, cutting machine allocation plan revised high week is meet many schemes directly sending the Yunnan Power System service requirement of asynchronous operation, and final scheme is as shown in table 7.It is worthy of note, direct current frequency limitation function has a very important role to the frequency stabilization that the many direct currents of maintenance send asynchronous operation electrical network.
Cut the nucleus correcting system of machine allocation plan the height week that the present invention also provides a kind of many direct currents to send asynchronous operation electrical network, as shown in Figure 5, comprising:
Modeling and simulating module 101, sends simulation model corresponding to asynchronous operation electrical network for setting up with many direct currents to be configured.
Many direct currents send asynchronous operation electrical network, refer to that this area's electrical network and major network are without alternating current interconnection, are only connected with major network by multiple-circuit line.
Simulation model refers to the topological structure for simulating operation of power networks to be configured.Simulation model comprises the direct current detailed model considering DC control system, the machine unit speed regulating device model considering dead band and difference coefficient.Wherein, in machine unit speed regulating device model, dead band and difference coefficient adopt Multi simulation running simulation to obtain the parameter of closing to reality system operating characteristics.
Load flow calculation module 102, determines operational mode to be studied for carrying out Load flow calculation on simulation model.
By carrying out Load flow calculation on simulation model, the limit operational mode that fully can expose stabilization of power grids problem to be configured is being selected to be operational mode to be studied.
Simulation algorithm model 103, wait that checking high week cuts machine allocation plan for basis, after there is the fault in forecast failure collection in simulation calculation simulation model under operational mode to be studied network system frequency characteristic and cut machine, low-frequency load reduction action situation height week, obtain simulation result.
Wait that checking the parameter of cutting machine allocation plan high week comprises: cut motor-driven work wheel level high week, each takes turns initiation culture, each takes turns action delay definite value and each round cut machine amount.
Judge module 104, pre-conditioned for judging whether simulation result meets.
If simulation result meets pre-conditioned, then think and this high week cut machine allocation plan and meet power grid security needs.
Pre-conditionedly to comprise:
Study in the frequency transient process of electrical network and be no more than 3s more than the 51.5Hz duration, avoid causing the unordered action of fired power generating unit overspeed protection; Study the frequency experience dynamic change of electrical network after the steady-state value that reaches between 49.2Hz to 50.5Hz; Study electrical network low cycles unloading device be failure to actuate; Study and high week cut machine under single direct current one pole latch status occurs electrical network and be failure to actuate, meet " guiding rules of power system safety and stability " requirement; And receiving end electric network fault is when causing studied electrical network to send multiple-circuit line commutation failure outside, study cut in electrical network height week machine be failure to actuate or actuating quantity as far as possible few, avoid cutting in high week the excessive causing trouble of machine actuating quantity disappear after low cycles unloading device action.
Correcting module 105, for when the result of determination of judge module is no, that cuts that machine allocation plan obtains revising the height week to be checked according to simulation result correction cuts machine allocation plan in height week, and is cut machine allocation plan the height week of correction and cut machine allocation plan high week export to simulation algorithm model as waiting to check.
Revise and cut machine scheme high week and comprise that motor-driven work wheel level is cut in adjustment high week, each takes turns initiation culture, each takes turns action delay definite value and each round cut machine amount.
Allocation plan determination module 106, for when the result of determination of judge module is for being, determines to wait to check that to cut machine allocation plan high week be meet many direct currents to be configured to send the scheme that asynchronous operation operation of power networks requires.
This many direct current sends the nucleus correcting system cutting machine allocation plan height week of asynchronous operation electrical network, after the fault concentrated by utilizing simulation model simulation calculation generation forecast failure, the situation of network system obtains simulation result, forecast failure collection is sent section outside cut-off except fault except being comprised traditional electrical network, also comprise asynchronous operation electric network fault to the impact of studied mains frequency, can check according to cutting machine allocation plan to high week and revise, send to be met many direct currents to be configured the scheme that asynchronous operation operation of power networks requires.This many direct current sends the nucleus correcting system cutting machine allocation plan height week of asynchronous operation electrical network, and Consideration is comprehensive, workable, has higher practical value and good market prospects.
In the execution mode that another is concrete, as shown in Figure 6, also comprise:
Forecast failure collection memory module 107, for setting up this forecast failure collection in advance.Comprise the catastrophe failure that many direct currents are sent the contingent catastrophe failure of asynchronous operation electrical network and occurred.
In a particular embodiment, fault in fault set comprises: many direct currents are sent asynchronous operation electrical network and sent the simultaneously one pole locking of the locking of direct current generation one pole, multiple direct current, the tripping of single DC bipolar block stability control device or the tripping of multiple direct current locking simultaneously stability control device outside, and receiving end electric network fault causes many direct currents and sends asynchronous operation electrical network and send multiple-circuit line commutation failure outside.
In the execution mode that another is concrete, Load flow calculation module, specifically for adopting Newton-Raphson approach to carry out Load flow calculation and determine operational mode to be studied, operational mode comprise that regional power grid start is maximum and the start of the operational mode that load is maximum, regional power grid is maximum and in operational mode that between operational mode that load is minimum and regional power grid net, transmitted power is maximum any one or multiple.
In the execution mode that another is concrete, simulation algorithm model, specifically for the direct current sending end frequency limitation device that puts into operation, adopt implicit expression trapezoid numerical integration algorithm, after there is each fault in forecast failure collection under the operational mode that simulation calculation is to be studied network system frequency characteristic and cut machine height week, low-frequency load reduction action situation obtains simulation result.The direct current sending end that puts into operation frequency limitation device as shown in Figure 4.
Simulation calculation in present embodiment considers that direct current sending end frequency limitation device drops into.For direct current a fairly large number of low capacity asynchronous operation electrical network, direct current frequency limitation function will play a significant role to mains frequency is stable, it can utilize the quick controllability of DC transmission system power, by responding system frequency change, regulate direct current transmission power, sending end (or receiving end) AC system frequency is made to remain on rated value (in the dead zone range of setting), therefore, the cooperation control cutting machine measure in direct current frequency limitation function and height week also becomes problem demanding prompt solution.
Frequency limitation device all has setting at direct current system two ends current conversion station, it is the quick controllability utilizing DC transmission system power, by responding system frequency change, regulate direct current transmission power, make sending end (or receiving end) AC system frequency remain on rated value (in the dead zone range of setting), major parameter comprises frequency dead band limited field, DC power modulation scope, proportional gain, storage gain.
This many direct current sends the nucleus correcting system cutting machine allocation plan height week of asynchronous operation electrical network, after the fault concentrated by utilizing simulation model simulation calculation generation forecast failure, the situation of network system obtains simulation result, direct current frequency limitation function and all cooperation control cutting machine measure of height is considered in simulation calculation, and forecast failure collection is sent section outside cut-off except fault except being comprised traditional electrical network, also comprise asynchronous operation electric network fault to the impact of studied mains frequency, can check according to cutting machine allocation plan to high week and revise, the scheme that asynchronous operation operation of power networks requires is sent to be met many direct currents to be configured.This many direct current sends the nucleus correcting system cutting machine allocation plan height week of asynchronous operation electrical network, and Consideration is comprehensive, workable, has higher practical value and good market prospects.
Each technical characteristic of above embodiment can combine arbitrarily, for making description succinct, all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics does not exist contradiction, be all considered to be the scope that this specification is recorded.
Above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be construed as limiting the scope of the patent.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (10)
1. direct current more than sends the check method cutting machine allocation plan height week of asynchronous operation electrical network, comprising:
Set up and send simulation model corresponding to asynchronous operation electrical network with many direct currents to be configured;
Described simulation model carries out Load flow calculation and determines operational mode to be studied;
According to waiting that checking high week cuts machine allocation plan, after there is the fault in forecast failure collection in simulation model described in simulation calculation under described operational mode to be studied network system frequency characteristic and cut machine, low-frequency load reduction action situation height week, obtain simulation result;
Judge whether described simulation result meets pre-conditioned;
If so, wait described in then determining to check and cut machine allocation plan high week for many direct currents to be configured described in meeting and send the scheme that asynchronous operation operation of power networks requires;
If not, that cuts that machine allocation plan obtains revising height week then to be checked according to described simulation result correction cuts machine allocation plan in height week, is cut machine allocation plan the height week of described correction as waiting that checking high week cuts machine allocation plan, returns the step of simulation calculation.
2. many direct currents according to claim 1 send the check method cutting machine allocation plan height week of asynchronous operation electrical network, it is characterized in that, before the step of described simulation calculation, also comprise:
Set up forecast failure collection, described forecast failure collection comprises: described many direct currents are sent asynchronous operation electrical network and sent the simultaneously one pole locking of the locking of direct current generation one pole, multiple direct current, the tripping of single DC bipolar block stability control device and the tripping of multiple direct current locking simultaneously stability control device outside, and receiving end electric network fault causes described many direct currents and sends asynchronous operation electrical network and send multiple-circuit line commutation failure outside.
3. many direct currents according to claim 1 send the check method cutting machine allocation plan height week of asynchronous operation electrical network, and it is characterized in that, the described Load flow calculation that carries out on described simulation model determines that the step of operational mode to be studied is specially:
Adopt Newton-Raphson approach to carry out Load flow calculation and determine operational mode to be studied, described operational mode comprise that regional power grid start is maximum and the start of the operational mode that load is maximum, regional power grid is maximum and in operational mode that between operational mode that load is minimum and regional power grid net, transmitted power is maximum any one or multiple.
4. many direct currents according to claim 1 send the check method cutting machine allocation plan height week of asynchronous operation electrical network, it is characterized in that, described basis waits that checking high week cuts machine allocation plan, the frequency characteristic of described simulation model and height week cuts machine, low-frequency load reduction action situation obtains simulation result step after there is the fault in described fault set under operational mode described in simulation calculation, be specially:
The direct current sending end that puts into operation frequency limitation device, adopt implicit expression trapezoid numerical integration algorithm, after there is each fault in forecast failure collection under operational mode to be studied described in simulation calculation network system frequency characteristic and cut machine, low-frequency load reduction action situation height week, obtain simulation result.
5. the many direct currents according to any one of Claims 1-4 send the check method cutting machine allocation plan height week of asynchronous operation electrical network, it is characterized in that, described high week cut machine scheme and comprise: cut motor-driven work wheel level high week, each takes turns initiation culture, each takes turns action delay definite value and each round cut machine amount.
6. direct current more than sends the nucleus correcting system cutting machine allocation plan height week of asynchronous operation electrical network, comprising:
Modeling and simulating module, sends simulation model corresponding to asynchronous operation electrical network for setting up with many direct currents to be configured;
Load flow calculation module, determines operational mode to be studied for carrying out Load flow calculation on described simulation model;
Simulation algorithm model, wait that checking high week cuts machine allocation plan for basis, after there is the fault in forecast failure collection in simulation model described in simulation calculation under described operational mode to be studied network system frequency characteristic and cut machine, low-frequency load reduction action situation height week, obtain simulation result;
Judge module, pre-conditioned for judging whether described simulation result meets;
Correcting module, for when the result of determination of described judge module is no, that cuts that machine allocation plan obtains revising height week to be checked according to described simulation result correction cuts machine allocation plan in check height week, and is cut machine allocation plan the height week of described correction and cut machine allocation plan high week export to simulation algorithm model as waiting to check;
Allocation plan determination module, for when the result of determination of described judge module is for being, waits described in determining to check and cutting machine allocation plan high week for many direct currents to be configured described in meeting and send the scheme that asynchronous operation operation of power networks requires.
7. many direct currents according to claim 6 send the nucleus correcting system cutting machine allocation plan height week of asynchronous operation electrical network, it is characterized in that, also comprise:
Forecast failure collection, described forecast failure collection is set up in advance, comprise: described many direct currents are sent asynchronous operation electrical network and sent the simultaneously one pole locking of the locking of direct current generation one pole, multiple direct current, the tripping of single DC bipolar block stability control device and the tripping of multiple direct current locking simultaneously stability control device outside, and receiving end electric network fault causes described many direct currents and sends asynchronous operation electrical network and send multiple-circuit line commutation failure outside.
8. many direct currents according to claim 6 send the nucleus correcting system cutting machine allocation plan height week of asynchronous operation electrical network, it is characterized in that, described Load flow calculation module, specifically for adopting Newton-Raphson approach to carry out Load flow calculation and determine operational mode to be studied, described operational mode comprise that regional power grid start is maximum and the start of the operational mode that load is maximum, regional power grid is maximum and in operational mode that between operational mode that load is minimum and regional power grid net, transmitted power is maximum any one or multiple.
9. many direct currents according to claim 7 send the nucleus correcting system cutting machine allocation plan height week of asynchronous operation electrical network, it is characterized in that, described simulation algorithm model, specifically for the direct current sending end frequency limitation device that puts into operation, adopt implicit expression trapezoid numerical integration algorithm, after there is each fault in forecast failure collection under operational mode to be studied described in simulation calculation network system frequency characteristic and cut machine height week, low-frequency load reduction action situation obtains simulation result.
10. the many direct currents according to any one of claim 6 to 9 send the nucleus correcting system cutting machine allocation plan height week of asynchronous operation electrical network, it is characterized in that, described high week cut machine scheme and comprise: cut motor-driven work wheel level high week, each takes turns initiation culture, each takes turns action delay definite value and each round cut machine amount.
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