CN107578118A - A kind of optimization method and its device of DC transmission system wave filter switching strategy - Google Patents
A kind of optimization method and its device of DC transmission system wave filter switching strategy Download PDFInfo
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- CN107578118A CN107578118A CN201710604067.XA CN201710604067A CN107578118A CN 107578118 A CN107578118 A CN 107578118A CN 201710604067 A CN201710604067 A CN 201710604067A CN 107578118 A CN107578118 A CN 107578118A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
Abstract
The invention provides a kind of optimization method and its device of DC transmission system wave filter switching strategy, it includes：Count the information of power system subregion；Check the data reasonability built；Count DC transmission system filter parameter；Alternative switching strategy is chosen from the switching strategy of formulation；The reasonability of alternative is analyzed, determines optimal switching strategy.Technical scheme provided by the invention reduces the direct current near region voltage pulsation amplitude caused by wave filter switching strategy is unreasonable, reduces unnecessary analysis, calculates simply, adaptability is extensive.
Description
Technical field
The present invention relates to a kind of simulation of power system and the decision method of calculating field, and in particular to a kind of direct current
The optimization method and its device of transmission system wave filter switching strategy.
Background technology
A large amount of put into operation of extra-high voltage direct-current system brings severe challenge to power network safety operation, is handed over extensive
The formation of direct current interconnected network, straight-flow system are increasingly becoming one of key factor for influenceing electricity net safety stable.
In the process of running, DC side inevitably produces a large amount of harmonic waves to D.C. high voltage transmission (HVDC) system, makes
The neighbouring communication line of DC line is interfered, therefore must be suppressed by filter.
Putting into operation for direct current improves the static electric voltage stability of its near region, alleviates the heavier pressure of near region interconnection trend
Power, improve near region load and receive ability.But after locking failure occurs for direct current Operation at full power, due to extra-high voltage direct-current system not
Consume again idle, the filter apparatus excision of extra-high voltage direct-current System Reactive Power compensation has hysteresis, a large amount of idle so as to produce in short-term
It is more than needed, greatly improve near region website voltage, after wave filter is cut off, near region website voltage declines rapidly, voltage pulsation amplitude
It is larger, also result near region unit reactive power and exciting current increase.So DC transmission system wave filter switching strategy
Quality will directly influence the stable operation of straight-flow system, even whole power network.
Needed for this for influence of the direct current locking failure postfilter to system voltage stability provide it is a kind of determine it is excellent
Change the technical scheme of switching strategy.
The content of the invention
To solve above-mentioned deficiency of the prior art, it is an object of the invention to provide a kind of filtering of DC transmission system
The optimization method of device switching strategy, this method can be by adjusting VSC-HVDC power outputs so that power supply zone trend is realized most
Optimal sorting cloth, and phenomena such as circuit overload and out-of-limit busbar voltage can be eliminated after the system failure, grid stability greatly improved.
The purpose of the present invention is realized using following technical proposals：A kind of DC transmission system wave filter switching strategy
Optimization method, it is theed improvement is that, methods described comprises the steps:
Step 1：Count the information of power system subregion；
Step 2：Count DC transmission system filter parameter；
Step 3：Formulate alternative switching strategy；With
Step 4：Determine optimal switching strategy.
Preferably, the step 1 includes：The information of the power system subregion includes：It is load bus active power, idle
Performance number and load type；Power plant parameter；Substation transformer capacity and number of units；Flexible direct current system parameter；And power train
System topological structure.
Preferably, the DC transmission system filter parameter of the step 2 connects including DC transmission system wave filter
The number of packet of the voltage class, total capacity and the wave filter that enter.
Preferably, the step 3 includes：
Step 3-1：Trend primary Calculation is carried out using Load Flow Calculation Software, ensures the convergence of trend；
Step 3-2：Checking the parameter of following elements includes：Check that node voltage is horizontal, it is horizontal to check Line Flow and examines
Look into transformer bet power；
Step 3-3：It is determined that determine the input group number of wave filter；
Step 3-4：It is determined that power system can keep stable operation in the case of microvariations or single failure.
Preferably, the number of packet of the wave filter includes the big group of sum and group's sum of wave filter；Each big group and
Group's wave filter total capacity, and group's wave filter quantity that each big group of wave filter includes.
Preferably, the switching strategy that the wave filter is taken according to DC Line Fault：
Bipolar locking, the disposable excision of group wave filter group number l settings included according to big group of number k of wave filter and per big group
Excision strategy step by step；With monopole locking, the half of wave filter group number is taken to set switching strategy.
Preferably, for bipolar locking failure, disposable switching strategy DiFor big group of wave filter (1≤i of disposable excision i
≤ k), and for monopole locking failure, disposable switching strategy DiFor disposable excision big group of wave filter of i (1≤i≤k/2).
Preferably, for bipolar locking failure, switching strategy G step by stepiTo cut off big group of wave filter of i (1≤i≤k) step by step,
Excision l/2 groups every time, 0.3 second interval time；With for the disposable switching strategy D of monopole locking failureiFor disposable excision i
Big group wave filter (1≤i≤k/2).
Preferably, the step 4 includes：
According to DC bipolar block take conventional filter excision strategy scenarios under with DC converter station electrical distance compared with
Near and voltage class identical substation bus bar voltage variation parameter, choose the larger transformer station of voltage pulsation and current conversion station conduct
Referenced stations；And/or taken according to DC bipolar block electric with DC converter station under conventional filter excision strategy scenarios
Power station exciting current running parameter closer to the distance, the unit that selection exciting current changes greatly is as reference unit.
Preferably, the running parameter of referenced stations voltage under different switching strategies is counted, with reference to generating unit excitation electric current
Change；Choose the smaller, steady-state value of fluctuation and the less scheme of initial value difference is used as and primarily determines that alternative.
Preferably, alternative is judged according to the existing power system voltage in this area and var fire protection technology standard
In substation bus bar voltage max and minimum value whether meet regulation, the program is removed if not meeting；By each alternative side
Before and after the excision of case median filter between the maximum △ U and busbar voltage, DCgenerator motor field electric current steady-state value and initial value of voltage pulsation
The minimum scheme of difference △ U ', △ I ' summations is as final scheme.
The present invention also proposes a kind of optimization device of DC transmission system wave filter switching strategy, and described device includes：
Data acquisition module, for counting the information of power system subregion, and statistics DC transmission system filter parameter；
Data processing module, for formulating alternative switching strategy；
Data judge module, for determining optimal switching strategy.
With immediate prior art ratio, the present invention has the advantages that：
Technical scheme provided by the invention can accurately select the optimization switching technology for being suitable for power network practical operation situation
Scheme, the safety and stability of power network is ensure that, be significant for the safe and stable operation of direct current near region system.
Technical scheme provided by the invention can optimize adjustment to the switching strategy of straight-flow system wave filter, reduce because throwing
Cut strategy it is unreasonable and caused by straight-flow system near region voltage and generating unit excitation current fluctuation amplitude, reduce power network occur electricity
The risk of collapse accident is pressed, the flexibility of Network Voltage Stability and power system operating mode arrangement is improved, analysis, calculates letter
Single, adaptability is extensive.
Brief description of the drawings
Fig. 1 is a kind of optimization method method flow of DC transmission system wave filter switching strategy provided by the invention
Figure；
Fig. 2 is computing system wiring diagram provided by the invention.
Embodiment
Technical scheme is described in further detail below in conjunction with the accompanying drawings.
Description and the specific embodiments of the present invention provided with reference to accompanying drawing below, to enable those skilled in the art to
Implement.Technical staff can be proposed under the enlightenment of embodiments of the invention other include structure, logic, electric, mistake
Journey and other technical schemes changed.Except clearly requiring otherwise, component provided by the invention and function be it is optional,
The order of operation can change.Segmentation scheme and feature in some embodiments can be by the technical sides of other embodiments
Case and feature are replaced.The scope summarized by the implementation of the present invention be included in claim it is whole within the scope of, or claim
The equivalent of technical scheme.In this specification, embodiments of the invention individually or can be represented generally with term " invention ", only
Merely to statement is convenient, if present specification disclosure in fact discloses the design more than an invention, show
Term " invention " should be so interpreted as to technical staff and inspire down any invention that can be drawn without involving an inventive effort herein
Or design.
The present invention provides a kind of method for determining to suppress the DC transmission system filter optimization switching strategy of voltage pulsation,
Methods described includes：
Step 1：Gather the information of power system subregion；
Step 2：DC transmission system filter parameter is calculated needed for statistics；
Step 4：Formulate alternative switching strategy；
Step 5：Determine optimal switching strategy.
Embodiment one
The DC transmission system for suppressing voltage pulsation with reference to a kind of determination of offers of the journey such as Fig. 1 to the present invention filters
The method of device optimization switching strategy makees specific describe in detail.
Step 1：The information of power system subregion is counted, the trend needed for calculating is built and stablizes data.
Comprise the steps：
Step 1-1：The information of statistical system subregion, described information include：
Load bus active and reactive power value and load type；
Power plant parameter, substation transformer capacity, number of units, flexible direct current system parameter and power system topological structure.
Step 1-2：According to step 1-1 result, it is determined that calculating trend and stablizing data file.
Step 2：The data reasonability built is checked, is comprised the steps：
Step 2-1 includes：
Trend primary Calculation is carried out using Load Flow Calculation Software, ensures the convergence of trend；
Press《Power system voltage and var fire protection technology》In regulation check node voltage level whether close symbol will
Ask；
Check that Line Flow is horizontal, ensure that Line Flow is no more than the hot steady limit of circuit itself；
Transformer bet power is checked, ensures that bet power is no more than the rated capacity of transformer；
Straight-flow system transmission power is set, and the percentage setting of specified transmission power is accounted for according to direct current actual fed power
Wave filter input group number, it is specific to organize the value that rounds up that number is wave filter group sum * percentages.
Step 2-2 includes：Carry out stablizing primary Calculation using stability Calculation software, ensure power system in microvariations or list
It can keep stable in the case of one failure.
Step 3：DC transmission system filter parameter is calculated needed for statistics, the parameter includes wave filter total amount, packet
Situation and every group of filter capacity.
Step 4：Alternative switching strategy is chosen from the switching strategy of formulation, including：
Step 4-1：According to the DC Line Fault of determination：
Big group of number k of wave filter and include group wave filter group number l settings one per big group that bipolar locking counts according to step 3
Secondary property excision and step by step excision strategy；Or
Monopole locking then takes the half of wave filter group number to set switching strategy.
Step 4-2：
For bipolar locking failure, disposable switching strategy DiFor disposable excision big group of wave filter of i (1≤i≤k)；
For monopole locking failure, disposable switching strategy DiFor disposable excision big group of wave filter of i (1≤i≤k/2).
Step 4-3：
For bipolar locking failure, switching strategy G step by stepiTo cut off big group of wave filter of i (1≤i≤k) step by step, cut every time
Except l/2 groups, 0.3 second interval time；
For monopole locking failure, switching strategy G step by stepiTo cut off big group of wave filter of i (1≤i≤k/2) step by step, every time
Cut off l/2 groups, 0.3 second interval time.
Then, in the case where DC bipolar block takes conventional filter excision strategy scenarios：
Count and voltage class identical substation bus bar voltage variation parameter relatively near with DC converter station electrical distance, choosing
The transformer station and current conversion station that voltage pulsation is larger are taken as referenced stations；Or
Statistics and the nearer power station exciting current running parameter of DC converter station electrical distance, choose exciting current change
Larger unit is as reference unit.
Count the referenced stations voltage under different switching strategies, with reference to generating unit excitation electric current or particular concern element
The change of index of correlation, until all switching strategies under referenced stations voltage, with reference to generating unit excitation electric current or particular concern
The change statistics of element index of correlation finishes.
Compare different schemes voltage and exciting current, choose and fluctuate smaller, steady-state value and the less scheme work of initial value difference
To primarily determine that alternative switching scheme.
Step 5：The reasonability of alternative is analyzed, determines that optimal switching strategy includes
Step 5-1：The reasonability of each alternative is analyzed, if substation bus bar voltage max and minimum value are not met
《Power system voltage and var fire protection technology》In regulation, then remove the program；
Step 5-2：The maximum △ U and busbar voltage, DCgenerator motor field electric current of voltage pulsation before and after selecting filter excision
The steady-state value scheme minimum with initial value difference △ U ', △ I ' summations is optimal switching strategy.
Embodiment two
Technical scheme is done so that brocade revives DC transmission system wave filter switching strategy as an example further below in detail
Describe in detail bright：
DC converter station change of current capacity 7200MW, bipolar, 12 pulse conversion devices series wirings of every pole 2, ± 800kV are straight
Outflow line 1 is returned (bipolar), and alternating current filter (capacitor) is configured by 4320Mvar, divides 4 big group, totally 16 group, is held per group
Measure 270Mvar.
According to case above, it is available for alternative DC transmission system wave filter switching strategy to have：
1. disposably cut off all wave filters；
2. the disposably group wave filter 3240MVar greatly of excision 3, retains remaining wave filter；
3. the disposably group wave filter 2160MVar greatly of excision 2, retains remaining wave filter；
4. the disposably group wave filter 1080MVar greatly of excision 1, retains remaining wave filter；
5. cutting off all wave filters step by step, 2 group 540MVar are cut off every time；
6. the group wave filter 3240MVar greatly of excision 3 step by step, cuts off 2 group 540MVar, retains remaining wave filter every time；
7. the group wave filter 2160MVar greatly of excision 2 step by step, cuts off 2 group 540MVar, retains remaining wave filter every time；Or
8. the group wave filter 1080MVar greatly of excision 1 step by step, cuts off 2 group 540MVar, retains remaining wave filter every time.
As shown in Fig. 2 (4) and Yushan (5) five are shown disrespect on inner (1), Wujiang (2), car mill (3), wood with the direct current near region of statistics
Individual power station voltage and Hua Su power plant (I), Changshu Er Chang (II), Zhabei combustion engine (III), the factory of sharp port two (IV), Liu He power plant (V) and
Six Power Plant exciting currents of Environmental Power Plant (VI) are as reference index.
Result of calculation based on strategy 1 is listed in the table below 1：
The near region website busbar voltage of table 1 and related DCgenerator motor field curent change situation (switching strategy 1)
The data of 8 DC transmission system wave filter switching strategies are recorded successively, and different wave filter switching plans are calculated
The website busbar voltage of near region five and related six DCgenerator motor field curent changes contrast situation are slightly descended, as shown in table 2：
Near region website busbar voltage and related DCgenerator motor field curent change contrast feelings under the different wave filter switching strategies of table 2
Condition table
Be can be seen that from upper table result of calculation by technical scheme provided by the invention, take wave filter switching strategy 6 i.e. by
The group wave filter 3240MVar greatly of level excision 3, cuts off 2 group 540MVar, bright and beautiful Soviet Union can be made by retaining the strategy of remaining wave filter every time
After DC Line Fault voltage pulsation, the recovery value of voltage and the lift-off value of DCgenerator motor field electric current are optimal effect, therefore recommend to take
This strategy.
Above-mentioned true explanation, a kind of DC transmission system wave filter switching strategy for suppressing voltage pulsation provided by the invention
Optimization method, reduce the direct current near region voltage pulsation amplitude caused by wave filter switching strategy is unreasonable, analysis, calculate
Simply, adaptability is extensive.
The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, although with reference to above-described embodiment pair
The present invention is described in detail, and those of ordinary skill in the art can still enter to the embodiment of the present invention
Row modification or equivalent substitution, these are applying without departing from any modification of spirit and scope of the invention or equivalent substitution
Within pending claims of the invention.
Claims (12)
1. a kind of optimization method of DC transmission system wave filter switching strategy, it is characterised in that methods described includes following steps
Suddenly:
Step 1：Count the information of power system subregion；
Step 2：Count DC transmission system filter parameter；
Step 3：Formulate alternative switching strategy；
Step 4：Determine optimal switching strategy.
A kind of 2. optimization method of DC transmission system wave filter switching strategy according to claim 1, it is characterised in that
The step 1 includes：The information of the power system subregion includes：Load bus active power, reactive power value and load class
Type；Power plant parameter；Substation transformer capacity and number of units；Flexible direct current system parameter；With power system topological structure.
A kind of 3. optimization method of DC transmission system wave filter switching strategy according to claim 1, it is characterised in that
The DC transmission system filter parameter of the step 2 includes the voltage class, total of DC transmission system wave filter access
The number of packet of capacity and the wave filter.
A kind of 4. optimization method of DC transmission system wave filter switching strategy according to claim 3, it is characterised in that
The step 3 includes：
Step 3-1：Trend primary Calculation is carried out using Load Flow Calculation Software, ensures the convergence of trend；
Step 3-2：Checking the parameter of following elements includes：Check that node voltage is horizontal, checking Line Flow, horizontal and inspection becomes
Depressor bet power；
Step 3-3：Determine the input group number of wave filter；
Step 3-4：It is determined that power system can keep stable operation in the case of microvariations or single failure.
A kind of 5. optimization method of DC transmission system wave filter switching strategy according to claim 4, it is characterised in that
The number of packet of the wave filter includes the big group of sum and group's sum of wave filter；Each big group and group's wave filter it is total
Capacity, and group's wave filter quantity that each big group of wave filter includes.
A kind of 6. optimization method of DC transmission system wave filter switching strategy according to claim 5, it is characterised in that
The switching strategy that wave filter is taken according to DC Line Fault：
For bipolar locking failure, the group wave filter group number l settings included according to big group of number k of wave filter and per big group are disposable
Excision and step by step excision strategy；
Or for monopole locking failure, the half of wave filter group number is taken to set switching strategy.
A kind of 7. optimization method of DC transmission system wave filter switching strategy according to claim 6, it is characterised in that
For bipolar locking failure, disposable switching strategy DiFor disposable excision big group of wave filter of i (1≤i≤k)；
Or for monopole locking failure, disposable switching strategy DiFor disposable excision big group of wave filter of i (1≤i≤k/2).
A kind of 8. optimization method of DC transmission system wave filter switching strategy according to claim 6, it is characterised in that
For bipolar locking failure, switching strategy G step by stepiTo cut off big group of wave filter of i (1≤i≤k) step by step, l/2 is cut off every time
Group, 0.3 second interval time；
Or for the disposable switching strategy D of monopole locking failureiFor disposable excision big group of wave filter of i (1≤i≤k/2).
A kind of 9. optimization method of DC transmission system wave filter switching strategy according to claim 1, it is characterised in that
The step 4 includes：
According to DC bipolar block take relatively near with DC converter station electrical distance under conventional filter excision strategy scenarios and
Voltage class identical substation bus bar voltage variation parameter, the larger transformer station of voltage pulsation and current conversion station are chosen as reference
Website；And/or according to DC bipolar block take conventional filter excision strategy scenarios under with DC converter station electrical distance
Nearer power station exciting current running parameter, the unit that selection exciting current changes greatly is as reference unit.
10. a kind of optimization method of DC transmission system wave filter switching strategy according to claim 9, its feature exist
In counting the running parameter of referenced stations voltage under different switching strategies, the change with reference to generating unit excitation electric current；Choose ripple
Move smaller, steady-state value and the less scheme of initial value difference.
11. a kind of optimization method of DC transmission system wave filter switching strategy according to claim 10, its feature exist
In judging substation bus bar voltage max and the minimum value in alternative according to voltage and var fire protection technology standard
Whether meet regulation, the program is removed if not meeting；The maximum of voltage pulsation before and after each alternative median filter is cut off
Difference △ U ', the scheme of △ I ' summations minimum between value △ U and busbar voltage, DCgenerator motor field electric current steady-state value and initial value is as most
Whole scheme.
12. a kind of optimization device of DC transmission system wave filter switching strategy, described device include：
Data acquisition module, for counting the information of power system subregion, and statistics DC transmission system filter parameter；
Data processing module, for formulating alternative switching strategy；
Data judge module, for determining optimal switching strategy.
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| CN110224411A (en) * | 2019-07-12 | 2019-09-10 | 国网山东省电力公司临沂供电公司 | A kind of urgent coordinated control system reconnaissance constant volume method of reactive voltage |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109494690A (en) * | 2018-10-10 | 2019-03-19 | 特变电工新疆新能源股份有限公司 | A kind of error protection strategy of direct-current grid circuit |
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| CN110224411A (en) * | 2019-07-12 | 2019-09-10 | 国网山东省电力公司临沂供电公司 | A kind of urgent coordinated control system reconnaissance constant volume method of reactive voltage |
| CN110224411B (en) * | 2019-07-12 | 2023-01-24 | 国网山东省电力公司临沂供电公司 | Point selection and volume fixing method for reactive voltage emergency coordination control system |
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| CN107578118B (en) | 2022-10-11 |
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