CN105391050B - Checking method and system for high-cycle cutting machine configuration scheme - Google Patents
Checking method and system for high-cycle cutting machine configuration scheme Download PDFInfo
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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 invention provides a method and a system for checking a high-cycle tripping configuration scheme of a multi-direct-current-output asynchronous operation power grid, wherein the method for checking the high-cycle tripping configuration scheme of the multi-direct-current-output asynchronous operation power grid obtains a simulation calculation result by utilizing a simulation model to simulate and calculate the condition of the power grid system after a fault in an expected fault set occurs, the expected fault set comprises the traditional power grid delivery section break-off fault and the influence of the asynchronous operation power grid fault on the frequency of a researched power grid, and the method and the system can check and correct the high-cycle tripping configuration scheme so as to obtain a scheme meeting the operation requirement of the multi-direct-current-output asynchronous operation power grid to be configured. The checking method of the high-cycle generator tripping configuration scheme of the multi-direct-current-output asynchronous operation power grid has the advantages of comprehensive consideration, strong operability, higher practical value and good market prospect.
Description
Technical field
The present invention relates to field of power system control, the height that asynchronous operation power network is sent out more particularly to a kind of more direct currents is all
Cut the check method and system of machine configuration.
Background technology
As direct current transmission power is increasing, the system safe and stable operation risk that AC/DC parallel operation is brought is more next
It is more prominent.To avoid power network from occurring large area blackout when multiple failure occurs, progressively consider that implementation is asynchronous in Electric Power Network Planning
Without alternating current interconnection between interconnected network, i.e. two AC systems, and only it is connected by DC line, the generator in two systems turns
Son is without keeping synchronous.Though asynchronous interconnected network greatly improves system transient modelling angle stability problem, transported due to originally synchronous
Capable power network, after the power network of some scale is smallers is divided into using Asynchronous Interconnection mode, single power network is independently resisted power and disturbed
Dynamic ability declines, and the unit of non-faulting power network can not directly participate in the primary frequency modulation of faulty grids, is unfavorable for suppressing frequency
Fluctuation, frequency stabilization outstanding problem.
Cut machine in high week and belong to three lines of defence category, being configured for sending end power network and cutting machine device high week is solved outside sending end power network
An important technique measure of frequency control problem when sending the passage to disconnect, particularly with direct current transmission power is big, power system capacity is small
Weak sending end asynchronous operation power network, cut that machine arrangements are improper may to have problems with high week：
(1) when sending direct current generation locking outside, after sending end power network hinders for some reason there is power surplus in moment and frequency raises, right
Monopole locking occurs in single time high-capacity direct current, according to《Guiding rules of power system safety and stability (DL755-2001)》, system can not
Stability contorting measure is taken, sending end power network may raise because of frequency to be caused to cut the action of the machine first round high week, is unsatisfactory for power network and is born
The safety and stability standard of large disturbances ability；
(2) more serious situation is considered, when sending more times locking and stability control device trippings simultaneously of direct current outside, sending end power network is because of power
Superfluous serious, if sending end power network height week cuts, machine configuration amount is inadequate, and the frequency higher duration is longer in transient process, may cause
The unordered action of fired power generating unit overspeed protection；
(3) during receiving end electric network fault causes sending end power grid multi-circuit direct current commutation failure, sending end power network may be because of frequency
Raise and cause to cut in high week machine device action, when failure vanishes dc power is gradually recovered, sending end power network again can be because of power
Vacancy and frequency, which reduce, causes low frequency load shedding equipment to act.
The content of the invention
Based on this, it is necessary to send out the check method for cutting machine configuration high week of asynchronous operation power network to providing a kind of more direct currents
And system.
A kind of more direct currents send out the check method for cutting machine allocation plan high week of asynchronous operation power network, including：
Establish simulation model corresponding with more direct currents to be configured submitting asynchronous operation power network；
Load flow calculation is carried out on simulation model and determines the method for operation to be studied；
Machine allocation plan is cut high week according to waiting to check, and simulation calculation simulation model occurs in advance under the method for operation to be studied
Think the frequency characteristic of network system after the failure in fault set and cut machine, low-frequency load reduction action situation high week, obtain simulation calculation
As a result；
Judge whether simulation result meets preparatory condition；
If, it is determined that wait to check that to cut machine allocation plan high week be to meet that more direct currents to be configured send out asynchronous operation electricity
The scheme of network operation requirement；
If it is not, then according to simulation result amendment it is to be checked cut that machine allocation plan corrected high week cut machine in high week
Allocation plan, amendment is cut into machine allocation plan high week as waiting that checking high week cuts machine allocation plan, returns to the step of simulation calculation
Suddenly.
In wherein a kind of embodiment, before the step of simulation calculation, in addition to：
Establish forecast failure collection, it is contemplated that fault set includes：More direct currents send out asynchronous operation power network and send direct current generation monopole outside
Monopole locking, single DC bipolar block stability control device tripping and multiple direct currents locking simultaneously simultaneously of locking, multiple direct currents is surely controlled
Device tripping, and receiving end electric network fault trigger more direct currents submitting asynchronous operation power networks to send multiple-circuit line commutation failure outside.
In wherein a kind of embodiment, the step that Load flow calculation determines the method for operation to be studied is carried out on simulation model
It is rapid to be specially：
Load flow calculation is carried out using Newton-Raphson approach and determines the method for operation to be studied, the method for operation includes region electricity
Net start is maximum and load the is maximum method of operation, regional power grid start be maximum and the method for operation and regional power grid that load is minimum
Any one or more between net in the maximum method of operation of transmitted power.
In wherein a kind of embodiment, machine allocation plan is cut high week according to waiting to check, the simulation calculation method of operation issues
Give birth to the frequency characteristic of the failure post-simulation model in fault set and cut machine high week, low-frequency load reduction action situation obtains simulation calculation knot
The step of fruit, it is specially：
Put into operation direct current sending end frequency limit device, to be studied using implicit trapezoid numerical integration algorithm, simulation calculation
Under the method for operation occur forecast failure collection in each failure after network system frequency characteristic and cut machine in high week, low-frequency load reduction moves
Make situation, obtain simulation result.
In wherein a kind of embodiment, high week, which cuts machine scheme, to be included：Cut motor-driven work wheel level high week, each round starts frequency
Rate, each round action delay definite value and each round cut machine amount.
A kind of more direct currents send out the nucleus correcting system for cutting machine allocation plan high week of asynchronous operation power network, including：
Modeling and simulating module, send out that asynchronous operation power network is corresponding to emulate mould with more direct currents to be configured for establishing
Type；
Load flow calculation module, the method for operation to be studied is determined for carrying out Load flow calculation on simulation model；
Simulation algorithm model, wait to check for basis and cut machine allocation plan high week, simulation calculation simulation model is to be studied
The method of operation under occur forecast failure collection in failure after network system frequency characteristic and cut in high week machine, low-frequency load reduction action
Situation, obtain simulation result；
Judge module, for judging whether simulation result meets preparatory condition；
Correcting module, for judge module result of determination for it is no when, it is to be checked according to simulation result amendment
Cut in high week and cut machine allocation plan the check height week that machine allocation plan is corrected, and using amendment cut in high week machine allocation plan as
Wait to check and cut machine allocation plan high week and export to simulation algorithm model；
Allocation plan determining module, for when the result of determination of judge module is is, cutting machine it is determined that waiting to check in high week and matching somebody with somebody
The scheme of putting is to meet that more direct currents to be configured send out the scheme of asynchronous operation operation of power networks requirement.
In wherein a kind of embodiment, in addition to：
Forecast failure collection, it is contemplated that fault set pre-establishes, including：More direct currents send out asynchronous operation power network and send direct current outside
Monopole locking, single DC bipolar block stability control device tripping and multiple direct currents locking simultaneously simultaneously of monopole locking, multiple direct currents
Stability control device tripping, and receiving end electric network fault trigger more direct currents submitting asynchronous operation power networks to send multiple-circuit line commutation failure outside.
In wherein a kind of embodiment, Load flow calculation module, specifically for carrying out trend meter using Newton-Raphson approach
Calculate and determine the method for operation to be studied, the method for operation includes the method for operation that regional power grid start is maximum and load is maximum, region
Power network start is maximum and any in the maximum method of operation of transmitted power between the method for operation and regional power grid net of load minimum
It is one or more.
In wherein a kind of embodiment, simulation algorithm model, specifically for the direct current sending end frequency limit device that puts into operation,
Using implicit trapezoid numerical integration algorithm, each failure in forecast failure collection occurs under the simulation calculation method of operation to be studied
Cut machine in the frequency characteristic of network system and high week afterwards, low-frequency load reduction action situation obtains simulation result.
In wherein a kind of embodiment, high week, which cuts machine scheme, to be included：Cut motor-driven work wheel level high week, each round starts frequency
Rate, each round action delay definite value and each round cut machine amount.
More direct currents send out the check method for cutting machine allocation plan high week of asynchronous operation power network, by using simulation model
The situation of network system obtains simulation result after the failure that simulation calculation generation forecast failure is concentrated, it is contemplated that fault set is except bag
Include traditional power network and send section outside and cut-off outside failure, in addition to asynchronous operation electric network fault is to the shadow of studied mains frequency
Ring, can be checked and be corrected according to machine allocation plan is cut to high week, it is different with the more direct currents submitting for being met to be configured
The scheme of step operation operation of power networks requirement.More direct currents send out the check side for cutting machine allocation plan high week of asynchronous operation power network
Method, Consideration is comprehensive, workable, has higher practical value and good market prospects.
Brief description of the drawings
Fig. 1 is that a kind of more direct currents of embodiment send out the check method for cutting machine allocation plan high week of asynchronous operation power network
Flow chart；
Fig. 2 is that a kind of more direct currents of embodiment send out the check method for cutting machine allocation plan high week of asynchronous operation power network
Flow chart；
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 limit device that puts into operation of embodiment；
Fig. 5 is that a kind of more direct currents of embodiment send out the nucleus correcting system for cutting machine allocation plan high week of asynchronous operation power network
Functional module signal；
Fig. 6 is that more direct currents of another embodiment send out the check system for cutting machine allocation plan high week of asynchronous operation power network
The functional module signal of system.
Embodiment
As shown in figure 1, the check method for cutting machine allocation plan high week that more direct currents send out asynchronous operation power network includes：
S101：Establish simulation model corresponding with more direct currents to be configured submitting asynchronous operation power network.
More direct currents send out asynchronous operation power network, refer to that this area's power network, without alternating current interconnection, only passes through more Hui Zhi with major network
Stream is connected with major network.
Simulation model refers to the topological structure for simulating operation of power networks to be configured.Simulation model includes considering direct current control
The direct current detailed model of system processed, the machine unit speed regulating device model for considering dead band and difference coefficient.Wherein, in machine unit speed regulating device model
Dead band and difference coefficient simulate to obtain the parameter of closing to reality system operating characteristics using Multi simulation running.
S103：Load flow calculation is carried out on simulation model and determines the method for operation to be studied.
By carrying out Load flow calculation on simulation model, selection can fully expose stabilization of power grids problem to be configured
The limit method of operation is the method for operation to be studied.
S105：Machine allocation plan is cut high week according to waiting to check, and simulation calculation simulation model is under the method for operation to be studied
Occur forecast failure concentrate failure after network system frequency characteristic and cut in high week machine, low-frequency load reduction action situation, imitated
True result of calculation.
Wait that checking the parameter for cutting machine allocation plan high week includes：Cut motor-driven work wheel level, each round initiation culture, each high week
Take turns action delay definite value and each round cut machine amount.
S107：Judge whether simulation result meets preparatory condition.
If simulation result meets preparatory condition, then it is assumed that cuts machine allocation plan in the high week and meets power grid security needs.
Preparatory condition includes：
It is no more than 3s more than the 51.5Hz duration in the frequency transient process of studied power network, avoids causing fired power generating unit
The unordered action of overspeed protection；After the frequency experience dynamic change of studied power network the steady-state value that reaches 49.2Hz to 50.5Hz it
Between；The low cycles unloading device of studied power network is failure to actuate；Studied power network occurs to cut in high week under single direct current monopole latch status
Machine device is failure to actuate, and is met《Guiding rules of power system safety and stability》It is required that；And receiving end electric network fault causes outside studied power network
When sending multiple-circuit line commutation failure, study and cut that machine device is failure to actuate or actuating quantity is as far as possible few power network height week, avoid high week from cutting machine
The excessive low cycles unloading device action after causing failure vanishes of actuating quantity.
If step S107 result of determination is yes, step is performed：
S109：It is determined that waiting to check, to cut machine allocation plan high week be to meet that more direct currents to be configured send out asynchronous operation power network
The scheme of service requirement.
If S107 result of determination is no, i.e., simulation result is unsatisfactory for preparatory condition, then performs step:
S108:Matched somebody with somebody according to the machine of cutting in high week that machine allocation plan corrected of cutting in high week that simulation result amendment is to be checked
Scheme is put, the machine allocation plan of cutting in high week of amendment is cut into machine allocation plan, and return to step S105 high week as waiting to check.
Correct cut in high week machine scheme include adjusting cut motor-driven work wheel level in high week, each round initiation culture, each round action are prolonged
When definite value and each round cut machine amount.
More direct currents send out the check method for cutting machine allocation plan high week of asynchronous operation power network, by using simulation model
The situation of network system obtains simulation result after the failure that simulation calculation generation forecast failure is concentrated, it is contemplated that fault set is except bag
Include traditional power network and send section outside and cut-off outside failure, in addition to asynchronous operation electric network fault is to the shadow of studied mains frequency
Ring, can be checked and be corrected according to machine allocation plan is cut to high week, it is different with the more direct currents submitting for being met to be configured
The scheme of step operation operation of power networks requirement.More direct currents send out the check side for cutting machine allocation plan high week of asynchronous operation power network
Method, Consideration is comprehensive, workable, has higher practical value and good market prospects.
In another specific embodiment, as shown in Fig. 2 before or after step S103, in addition to step：
S104：Establish forecast failure collection.
Forecast failure collection pre-establishes, including more direct currents send out the catastrophe failure that may occur of asynchronous operation power network and
Catastrophe failure through occurring.
In a particular embodiment, the failure in fault set includes：More direct currents send out asynchronous operation power network and send direct current outside
The locking of generation monopole, multiple direct currents while monopole locking, single DC bipolar block stability control device tripping or multiple direct currents are simultaneously
Locking stability control device tripping, and receiving end electric network fault trigger more direct currents submitting asynchronous operation power networks to send multiple-circuit line commutation mistake outside
Lose.
In another embodiment, step S103 is specially:Load flow calculation is carried out using Newton-Raphson approach to determine to wait to grind
The method of operation studied carefully.
The method of operation includes the method for operation that regional power grid start is maximum and load is maximum, regional power grid start is maximum and bears
Any one or more between the minimum method of operation of lotus and regional power grid net in the maximum method of operation of transmitted power.
In another embodiment, step S105 is specially：
Put into operation direct current sending end frequency limit device, to be studied using implicit trapezoid numerical integration algorithm, simulation calculation
Under the method for operation occur forecast failure collection in each failure after network system frequency characteristic and cut machine in high week, low-frequency load reduction moves
Simulation result is obtained as situation.The direct current sending end frequency limit device that puts into operation is as shown in Figure 4.
Simulation calculation in present embodiment considers direct current sending end frequency limit device input.It is a fairly large number of small for direct current
Capacity asynchronous operation power network, direct current frequency limitation function will stably play a significant role to mains frequency, and it can utilize direct current
The quick controllability of transmission system power, is changed by response system frequency, is adjusted direct current transmission power, is made sending end (or receiving end)
AC system frequency is maintained at rated value (in the dead zone range of setting), and therefore, direct current frequency limitation function is with cutting machine in high week
The coordination control of both measures also turns into urgent problem to be solved.
Frequency limit device has setting in straight-flow system both ends current conversion station, and it is to utilize the quick of DC transmission system power
Controllability, changed by response system frequency, adjust direct current transmission power, be maintained at sending end (or receiving end) AC system frequency
Rated value (in the dead zone range of setting), major parameter include frequency dead band limitation scope, DC power modulation scope, ratio
Gain, storage gain.
More direct currents send out the check method for cutting machine allocation plan high week of asynchronous operation power network, by using simulation model
The situation of network system obtains simulation result after the failure that simulation calculation generation forecast failure is concentrated, and considers in simulation calculation
Direct current frequency limitation function and cut the coordination of machine measure high week and control, and forecast failure collection except include traditional power network send outside it is disconnected
Face is cut-off outside failure, in addition to the asynchronous influence for running electric network fault to studied mains frequency, can be cut according to high week
Machine allocation plan is checked and corrected, and asynchronous operation operation of power networks requirement is sent out to be met more direct currents to be configured
Scheme.The check method Consideration for cutting machine allocation plan high week that more direct currents send out asynchronous operation power network is comprehensive, operable
Property is strong, has higher practical value and good market prospects.
Configured below with the machine of cutting in Yunnan Power System a set of high week for running Asynchronous Interconnection with check method of the present invention
Exemplified by scheme carries out Simulation Evaluation, the inventive method is described in detail.Wait to check high week before Yunnan Power System Asynchronous Interconnection
It is as shown in table 1 to cut machine allocation plan.
Wait that checking high week cuts machine allocation plan before the Yunnan Power System Asynchronous Interconnection of table 1
Step A：Establish Yunnan Power System and the simulation model after south electric network Asynchronous Interconnection.Generator model is secondary using considering
" Eq " and " Ed " variation model of transient process, the effect of meter and governing system and excitation system, electricity is considered to Large-scale machine set
The effect of Force system stabilizer, load use the integrated load model of the constant-impedance of 50% induction conductivity+50%, machine unit speed regulating device
Dead band and difference coefficient are simulated to obtain the parameter of closing to reality system operating characteristics using Multi simulation running in model, and straight-flow system is adopted
With the both ends direct current detailed model in BPA programs, DC control system effect is considered, DC control system uses new model.
Step B：By Load flow calculation, the limit method of operation that selection can fully expose stabilization of power grids problem is to be studied
The method of operation.Fig. 3 shows the situation schematic diagram of Yunnan Power System electric power Transmission Corridor, and Yunnan Power System and south electric network are without exchanging
Interconnection, only by gold, kwan-yin rock, western Shandong back-to-back DC be connected with Guangxi Power Grid, by Chu Sui, general emigrant, ox from direct current
It is connected with Guangdong Power Grid.Table 2 shows the basic method of operation of Yunnan Power System, chooses Yunnan Power System start maximum and load is maximum
The method of operation and Yunnan Power System start is maximum and the method for operation that load is minimum, it is equal to send direct current outside for Yunnan Power System in two ways
Transmitted power is maximum between Man Fa, regional power grid net.
The basic method of operation of the Yunnan Power System of table 2
Step C：Establish forecast failure collection.In view of multiple-circuit line locking simultaneously and multiple-circuit line stabilized control system is simultaneously simultaneously
The probability of tripping is very low, it is contemplated that the fault type of failure concentrated setting includes single direct current monopole locking, single DC bipolar
Tripping, two direct current monopole lockings simultaneously are surely controlled in locking, bipolar locking surely controls tripping, and receiving end power network list to two direct currents simultaneously
Mutually short-circuit single-phase switch tripping causes multiple-circuit line commutation failure, wherein for switch failure failure, switch ma lf unction protection action
Fault clearing time was checked by 0.35 second afterwards.
Step D：The post-fault system frequency characteristic in forecast failure collection occurs under the method for operation that simulation calculation is studied
With cut in high week machine, low-frequency load reduction action situation, obtain simulation result.The frequency that direct current is sent out in Yunnan is considered in simulation analysis
Rate limitation function, i.e. sending end frequency limit function are put into, frequency dead band limitation scope ± 0.1Hz, and DC power modulation scope is
Pmodmin=-50%, Pmodmax=+20%, typical adjustment parameter Kp=30, KI=22.2.Result of calculation is shown in Table 3 to table 4
It is shown.
The Yunnan Power System of table 3 sends direct current locking outside and surely controls tripping result of calculation table
The receiving end power network AC fault of table 4 causes multiple-circuit line commutation failure result of calculation table
In order to illustrate direct current frequency limitation function to maintaining more direct currents to send out the stable importance of asynchronous operation mains frequency,
Simulation calculation has been carried out in the case where not considering direct current frequency limitation function to the method for operation 1 in selection table 2, the results are shown in Table 5 and table 6
It is shown.
Table 5 does not consider during direct current frequency limitation function that Yunnan Power System sends direct current locking outside or not surely controls tripping result of calculation table
Table 6 does not consider that receiving end power network AC fault causes multiple-circuit line commutation failure to calculate knot during direct current frequency limitation function
Fruit table
Step E：It is can be seen that by the obtained simulation results of step D under above-mentioned failure mode, it can be seen that：
(1), highest frequency is no more than 51.5Hz or not surpassed more than the 51.5Hz duration in Yunnan Power System transient process
3s is crossed, the unordered action of fired power generating unit overspeed protection will not be caused；
(2), recover frequency between 49.9Hz to 50.2Hz, meet system safety and stability needs；
(3) in the case of, not considering direct current frequency limitation function, when Yunnan Power System sends direct current generation monopole locking failure outside,
Highest frequency is cut the action of machine automatic safety device high week, is unsatisfactory for more than machine first round action definite value is cut Yunnan height week《Power train
System safety and stability directive/guide (DL755-2001)》；
(4), receiving end power network AC fault causes multiple-circuit line commutation failure, cuts motor-driven work in Yunnan Power System height week, wherein
In the case of not considering direct current frequency limitation function, after the recovery of failure vanishes dc power, Yunnan Power System frequency is reduced and caused
Yunnan low cycles unloading device action.
Step F：By step E assessment result, when monopole locking failure occurs in order to prevent Yunnan Power System from sending direct current outside
Cut machine device action high week, while in order that receiving end power network AC fault causes Yunnan Power System during multiple-circuit line commutation failure
Ensure frequency characteristic do not deteriorate on the premise of cut in high week machine be failure to actuate or actuating quantity as far as possible reduce, machine is cut to Yunnan Power System height week
Allocation plan is modified, amendment to cut machine allocation plan high week as shown in table 7.
The Yunnan Power System of table 7 revised high week cuts machine allocation plan
Machine allocation plan return to step D is cut to revised Yunnan Power System height week below and carries out simulation calculation, it is suitable to assess it
Ying Xing, it the results are shown in Table shown in 8 to table 10.
Table 8 does not consider during direct current frequency limitation function that Yunnan Power System sends direct current locking outside or not surely controls tripping result of calculation table
Table 9 considers that Yunnan Power System sends direct current locking outside and surely controls tripping result of calculation table during direct current frequency limitation function
The receiving end power network AC fault of table 10 causes multiple-circuit line commutation failure result of calculation table
Above-mentioned simulation result, which can be seen that, to be cut machine allocation plan meet step E's in revised Yunnan Power System height week
Full terms：
(1) study in the frequency transient process of power network and be no more than 3s more than the 51.5Hz duration；
(2) steady-state value reached after the frequency experience dynamic change of power network is studied between 49.2Hz to 50.5Hz；
(3) low cycles unloading device for studying power network is failure to actuate；
(4) study power network and occur to cut machine device high week under single direct current monopole latch status and be failure to actuate, meet《Power train
System safety and stability directive/guide》It is required that；
(5) when receiving end electric network fault causes the studied power network to send multiple-circuit line commutation failure outside, study power network height week and cut
Machine device ensure study be failure to actuate on the premise of mains frequency characteristic does not deteriorate or actuating quantity try one's best lack, avoid high week from cutting machine
The excessive low cycles unloading device action after causing failure vanishes of actuating quantity.
Step G：Therefore, machine allocation plan is cut revised high week to meet more Yunnan Power Systems for directly sending out asynchronous operation
The scheme of service requirement, final scheme are as shown in table 7.It is worthy of note that direct current frequency limitation function is to maintaining more direct currents to send
The frequency stabilization for going out asynchronous operation power network has a very important role.
The present invention also provides the nucleus correcting system for cutting machine allocation plan high week that a kind of more direct currents send out asynchronous operation power network, such as
Shown in Fig. 5, including：
Modeling and simulating module 101, for establishing emulation corresponding with more direct currents to be configured submitting asynchronous operation power network
Model.
More direct currents send out asynchronous operation power network, refer to that this area's power network, without alternating current interconnection, only passes through more Hui Zhi with major network
Stream is connected with major network.
Simulation model refers to the topological structure for simulating operation of power networks to be configured.Simulation model includes considering direct current control
The direct current detailed model of system processed, the machine unit speed regulating device model for considering dead band and difference coefficient.Wherein, in machine unit speed regulating device model
Dead band and difference coefficient simulate to obtain the parameter of closing to reality system operating characteristics using Multi simulation running.
Load flow calculation module 102, the method for operation to be studied is determined for carrying out Load flow calculation on simulation model.
By carrying out Load flow calculation on simulation model, selection can fully expose stabilization of power grids problem to be configured
The limit method of operation is the method for operation to be studied.
Simulation algorithm model 103, wait to check for basis and cut machine allocation plan high week, simulation calculation simulation model is being waited to grind
Under the method for operation studied carefully occur forecast failure collection in failure after network system frequency characteristic and cut machine in high week, low-frequency load reduction moves
Make situation, obtain simulation result.
Wait that checking the parameter for cutting machine allocation plan high week includes：Cut motor-driven work wheel level, each round initiation culture, each high week
Take turns action delay definite value and each round cut machine amount.
Judge module 104, for judging whether simulation result meets preparatory condition.
If simulation result meets preparatory condition, then it is assumed that cuts machine allocation plan in the high week and meets power grid security needs.
Preparatory condition includes：
It is no more than 3s more than the 51.5Hz duration in the frequency transient process of studied power network, avoids causing fired power generating unit
The unordered action of overspeed protection；After the frequency experience dynamic change of studied power network the steady-state value that reaches 49.2Hz to 50.5Hz it
Between；The low cycles unloading device of studied power network is failure to actuate；Studied power network occurs to cut in high week under single direct current monopole latch status
Machine device is failure to actuate, and is met《Guiding rules of power system safety and stability》It is required that；And receiving end electric network fault causes outside studied power network
When sending multiple-circuit line commutation failure, study and cut that machine device is failure to actuate or actuating quantity is as far as possible few power network height week, avoid high week from cutting machine
The excessive low cycles unloading device action after causing failure vanishes of actuating quantity.
Correcting module 105, for when the result of determination of judge module is no, waiting to check according to simulation result amendment
Cut that machine allocation plan corrected high week cut machine allocation plan high week, and amendment is cut into machine allocation plan high week as treating
Check and cut machine allocation plan high week and export to simulation algorithm model.
Correct cut in high week machine scheme include adjusting cut motor-driven work wheel level in high week, each round initiation culture, each round action are prolonged
When definite value and each round cut machine amount.
Allocation plan determining module 106, for judge module result of determination for be when, it is determined that waiting that checking high week cuts machine
Allocation plan is to meet that more direct currents to be configured send out the scheme of asynchronous operation operation of power networks requirement.
More direct currents send out the nucleus correcting system for cutting machine allocation plan high week of asynchronous operation power network, by using simulation model
The situation of network system obtains simulation result after the failure that simulation calculation generation forecast failure is concentrated, it is contemplated that fault set is except bag
Include traditional power network and send section outside and cut-off outside failure, in addition to asynchronous operation electric network fault is to the shadow of studied mains frequency
Ring, can be checked and be corrected according to machine allocation plan is cut to high week, it is different with the more direct currents submitting for being met to be configured
The scheme of step operation operation of power networks requirement.More direct currents send out the check system for cutting machine allocation plan high week of asynchronous operation power network
System, Consideration is comprehensive, workable, has higher practical value and good market prospects.
In another specific embodiment, as shown in fig. 6, also including：
Forecast failure collection memory module 107, for pre-establishing the forecast failure collection.Asynchronous operation is sent out including more direct currents
Catastrophe failure that power network may occur and the catastrophe failure having occurred and that.
In a particular embodiment, the failure in fault set includes：More direct currents send out asynchronous operation power network and send direct current outside
The locking of generation monopole, multiple direct currents while monopole locking, single DC bipolar block stability control device tripping or multiple direct currents are simultaneously
Locking stability control device tripping, and receiving end electric network fault trigger more direct currents submitting asynchronous operation power networks to send multiple-circuit line commutation mistake outside
Lose.
In another specific embodiment, Load flow calculation module, specifically for carrying out trend using Newton-Raphson approach
Calculate and determine the method for operation to be studied, the method for operation includes the method for operation that regional power grid start is maximum and load is maximum, area
Domain power network is started shooting appointing in the method for operation of transmitted power maximum between maximum and load minimum the method for operation and regional power grid net
Meaning is one or more.
In another specific embodiment, simulation algorithm model, specifically for the direct current sending end frequency limit that puts into operation
Device, occur using implicit trapezoid numerical integration algorithm, under the simulation calculation method of operation to be studied each in forecast failure collection
Cut machine after failure in the frequency characteristic of network system and high week, low-frequency load reduction action situation obtains simulation result.Put into operation
Direct current sending end frequency limit device is as shown in Figure 4.
Simulation calculation in present embodiment considers direct current sending end frequency limit device input.It is a fairly large number of small for direct current
Capacity asynchronous operation power network, direct current frequency limitation function will stably play a significant role to mains frequency, and it can utilize direct current
The quick controllability of transmission system power, is changed by response system frequency, is adjusted direct current transmission power, is made sending end (or receiving end)
AC system frequency is maintained at rated value (in the dead zone range of setting), and therefore, direct current frequency limitation function is with cutting machine in high week
The coordination control of both measures also turns into urgent problem to be solved.
Frequency limit device has setting in straight-flow system both ends current conversion station, and it is to utilize the quick of DC transmission system power
Controllability, changed by response system frequency, adjust direct current transmission power, be maintained at sending end (or receiving end) AC system frequency
Rated value (in the dead zone range of setting), major parameter include frequency dead band limitation scope, DC power modulation scope, ratio
Gain, storage gain.
More direct currents send out the nucleus correcting system for cutting machine allocation plan high week of asynchronous operation power network, by using simulation model
The situation of network system obtains simulation result after the failure that simulation calculation generation forecast failure is concentrated, and considers in simulation calculation
Direct current frequency limitation function and cut the coordination of machine measure high week and control, and forecast failure collection except include traditional power network send outside it is disconnected
Face is cut-off outside failure, in addition to the asynchronous influence for running electric network fault to studied mains frequency, can be cut according to high week
Machine allocation plan is checked and corrected, and asynchronous operation operation of power networks requirement is sent out to be met more direct currents to be configured
Scheme.More direct currents send out the nucleus correcting system for cutting machine allocation plan high week of asynchronous operation power network, and Consideration is comprehensive, operable
Property is strong, has higher practical value and good market prospects.
Each technical characteristic of above example can be combined arbitrarily, to make description succinct, not to above-described embodiment
In each technical characteristic it is all possible combination be all described, as long as however, lance is not present in the combination of these technical characteristics
Shield, all it is considered to be the scope of this specification record.
Above example only expresses the several embodiments of the present invention, and its description is more specific and detailed, but can not
Therefore it is construed as limiting the scope of the patent.It should be pointed out that for the person of ordinary skill of the art,
On the premise of not departing from present inventive concept, various modifications and improvements can be made, these belong to protection scope of the present invention.
Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (8)
1. a kind of more direct currents send out the check method for cutting machine allocation plan high week of asynchronous operation power network, including：
Establish simulation model corresponding with more direct currents to be configured submitting asynchronous operation power network；
Load flow calculation is carried out on the simulation model and determines the method for operation to be studied；The method of operation includes regional power grid
Start is maximum and load the is maximum method of operation, regional power grid start be maximum and the method for operation and regional power grid net that load is minimum
Between any one or more in the maximum method of operation of transmitted power；
Machine allocation plan is cut high week according to waiting to check, and simulation model described in simulation calculation issues in the method for operation to be studied
The frequency characteristic of network system and machine, low-frequency load reduction action situation are cut high week after the failure that raw forecast failure is concentrated, and are emulated
Result of calculation；
Judge whether the simulation result meets preparatory condition；
If, it is determined that it is described wait to check cut machine allocation plan high week and send out asynchronous fortune for more direct currents to be configured described in meeting
The scheme of row operation of power networks requirement；
If it is not, then to be checked height week cut machine allocation plan high week and corrected according to the simulation result amendment
Machine allocation plan is cut, the machine allocation plan of cutting in high week of the amendment is cut into machine allocation plan high week as waiting to check, returns to emulation
The step of calculating；
The basis, which is waited to check, cuts machine allocation plan high week, and the event in the fault set occurs under the method for operation described in simulation calculation
Cut machine, low-frequency load reduction action situation the step of obtaining simulation result after barrier in the frequency characteristic of the simulation model and high week,
Specially：
Put into operation direct current sending end frequency limit device, to be studied described in simulation calculation using implicit trapezoid numerical integration algorithm
Under the method for operation occur forecast failure collection in each failure after network system frequency characteristic and cut machine in high week, low-frequency load reduction moves
Make situation, obtain simulation result.
2. more direct currents according to claim 1 send out the check method for cutting machine allocation plan high week of asynchronous operation power network,
Characterized in that, before the step of simulation calculation, in addition to：
Forecast failure collection is established, the forecast failure collection includes：More direct currents send out asynchronous operation power network and send direct current outside
Monopole locking, single DC bipolar block stability control device tripping and multiple direct currents locking simultaneously simultaneously of monopole locking, multiple direct currents
Stability control device tripping, and receiving end electric network fault trigger more direct current submitting asynchronous operation power networks to send multiple-circuit line commutation mistake outside
Lose.
3. more direct currents according to claim 1 send out the check method for cutting machine allocation plan high week of asynchronous operation power network,
Characterized in that, described be specially the step of progress Load flow calculation determines the method for operation to be studied on the simulation model：
Load flow calculation is carried out using Newton-Raphson approach and determines the method for operation to be studied, the method for operation includes region electricity
Net start is maximum and load the is maximum method of operation, regional power grid start be maximum and the method for operation and regional power grid that load is minimum
Any one or more between net in the maximum method of operation of transmitted power.
What 4. more direct currents according to any one of claims 1 to 3 sent out asynchronous operation power network cuts machine allocation plan high week
Check method, it is characterised in that the high week, which cuts machine scheme, to be included：Cut motor-driven work wheel level, each round initiation culture, each high week
Take turns action delay definite value and each round cut machine amount.
5. a kind of more direct currents send out the nucleus correcting system for cutting machine allocation plan high week of asynchronous operation power network, including：
Modeling and simulating module, for establishing simulation model corresponding with more direct currents to be configured submitting asynchronous operation power network；
Load flow calculation module, the method for operation to be studied is determined for carrying out Load flow calculation on the simulation model；The fortune
Fortune maximum and that load is minimum that line mode includes the method for operation that regional power grid start is maximum and load is maximum, regional power grid is started shooting
Any one or more between line mode and regional power grid net in the maximum method of operation of transmitted power；
Simulation algorithm model, wait to check for basis and cut machine allocation plan high week, simulation model is treated described described in simulation calculation
Under the method for operation of research occur forecast failure collection in failure after network system frequency characteristic and cut machine, low-frequency load reduction in high week
Action situation, obtains simulation result；
Judge module, for judging whether the simulation result meets preparatory condition；
Correcting module, for the judge module result of determination for it is no when, according to the simulation result amendment
Machine allocation plan is cut in be checked cutting in high week the check height week that machine allocation plan is corrected, and high week the amendment is cut into machine
Allocation plan is cut machine allocation plan high week and exported to simulation algorithm model as waiting to check；
Allocation plan determining module, for the judge module result of determination for be when, it is determined that described wait that checking high week cuts
Machine allocation plan sends out the scheme of asynchronous operation operation of power networks requirement for more direct currents to be configured described in satisfaction；
The simulation algorithm model, specifically for the direct current sending end frequency limit device that puts into operation, using implicit trapezoid numerical integration
Algorithm, the frequency of network system after each failure in forecast failure collection occurs under the method for operation to be studied described in simulation calculation
Cut machine in characteristic and high week, low-frequency load reduction action situation obtains simulation result.
6. more direct currents according to claim 5 send out the nucleus correcting system for cutting machine allocation plan high week of asynchronous operation power network,
Characterized in that, also include：
Forecast failure collection, the forecast failure collection pre-establish, including：More direct currents send out asynchronous operation power network and send direct current outside
The locking of generation monopole, multiple direct currents while monopole locking, single DC bipolar block stability control device tripping and multiple direct currents are simultaneously
Locking stability control device tripping, and receiving end electric network fault initiation more direct currents submitting asynchronous operation power networks are sent multiple-circuit line outside and changed
Mutually failure.
7. more direct currents according to claim 5 send out the nucleus correcting system for cutting machine allocation plan high week of asynchronous operation power network,
Characterized in that, the Load flow calculation module, to be studied specifically for being determined using Newton-Raphson approach progress Load flow calculation
The method of operation, the method for operation include the method for operation that regional power grid start is maximum and load is maximum, regional power grid start most
Big and any one or more between the method for operation and regional power grid net that load is minimum in the maximum method of operation of transmitted power.
What 8. more direct currents according to any one of claim 5 to 7 sent out asynchronous operation power network cuts machine allocation plan high week
Nucleus correcting system, it is characterised in that the high week, which cuts machine scheme, to be included：Cut motor-driven work wheel level, each round initiation culture, each high week
Take turns action delay definite value and each round cut machine amount.
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| CN106021673B (en) * | 2016-05-13 | 2018-02-13 | 国网江苏省电力公司电力科学研究院 | A kind of dc power based on powernet emulation supports decision-premaking method |
| CN108023363A (en) * | 2016-11-03 | 2018-05-11 | 南方电网科学研究院有限责任公司 | Simulation evaluation method and device for configuration of power grid high-frequency cutting machine |
| CN106487004B (en) * | 2016-11-11 | 2019-02-15 | 国家电网公司 | One electrical secondary system of intelligent substation runs hidden danger Intelligent drainage checking method |
| CN109066724B (en) * | 2018-07-24 | 2020-11-06 | 南方电网科学研究院有限责任公司 | Generator PSS model checking system |
| CN109687528B (en) * | 2018-11-16 | 2022-04-01 | 国电南瑞科技股份有限公司 | High-circumference cutting machine line-cutting-prevention quantity-cutting statistical method based on structured modeling |
| CN110112755A (en) * | 2019-05-10 | 2019-08-09 | 南瑞集团有限公司 | A kind of high week cuts the design method and system of machine scheme |
| CN110460096B (en) * | 2019-08-07 | 2021-12-03 | 国网山东省电力公司电力科学研究院 | Fault ride-through control method and device for new energy island flexible direct-sending system |
| CN112039130B (en) * | 2020-08-05 | 2022-04-29 | 武汉大学 | Voltage constraint considered emergency control method for weak transmitting end power grid after direct current fault |
| CN112147977B (en) * | 2020-08-19 | 2023-09-01 | 中国南方电网有限责任公司 | High-fidelity transmission test method for stability control system of direct-current transmission system |
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Effective date of registration: 20210730 Address after: 510700 3rd, 4th and 5th floors of building J1 and 3rd floor of building J3, No.11 Kexiang Road, Science City, Luogang District, Guangzhou City, Guangdong Province Patentee after: China South Power Grid International Co.,Ltd. Patentee after: CHINA SOUTHERN POWER GRID Co.,Ltd. Address before: 510080 water Donggang 8, Dongfeng East Road, Yuexiu District, Guangzhou, Guangdong. Patentee before: China South Power Grid International Co.,Ltd. Patentee before: CHINA SOUTHERN POWER GRID Co.,Ltd. Patentee before: POWER GRID TECHNOLOGY RESEARCH CENTER. CHINA SOUTHERN POWER GRID |