CN107482666A - A kind of extra-high voltage direct-current engineering converter power transformer short-circuit impedance design method - Google Patents
A kind of extra-high voltage direct-current engineering converter power transformer short-circuit impedance design method Download PDFInfo
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- CN107482666A CN107482666A CN201710826427.0A CN201710826427A CN107482666A CN 107482666 A CN107482666 A CN 107482666A CN 201710826427 A CN201710826427 A CN 201710826427A CN 107482666 A CN107482666 A CN 107482666A
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- power transformer
- converter power
- circuit impedance
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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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- 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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Abstract
The present invention relates to a kind of extra-high voltage direct-current engineering converter power transformer short-circuit impedance design method, it is characterised in that comprises the following steps：1) systematic parameter and major loop calculating parameter of extra-high voltage direct-current engineering are determined；2) according to the systematic parameter and major loop calculating parameter of obtained extra-high voltage direct-current engineering, and converter power transformer short-circuit impedance assumption value, the major loop for carrying out extra-high voltage direct-current engineering calculates, and determines boundary condition, obtains the preliminary recommendation of converter power transformer short-circuit impedance value；3) factor of analyzing influence converter power transformer short-circuit impedance selection, checks to the preliminary recommendation of converter power transformer short-circuit impedance, obtains converter power transformer short-circuit impedance under each influence factor and alternatively collect；4) alternatively collected according to converter power transformer short-circuit impedance under obtained each influence factor, choose the common factor that each converter power transformer short-circuit impedance alternatively collects, the converter power transformer short-circuit impedance value after being optimized.The present invention can be widely applied to technical field of ultrahigh voltage direct current.
Description
Technical field
The present invention relates to technical field of ultrahigh voltage direct current, especially with regard to a kind of extra-high voltage direct-current engineering change of current transformation
Device short-circuit impedance design method.
Background technology
Converter power transformer short-circuit impedance is to determine the important input condition of whole straight-flow system global design scheme, and the change of current becomes
The reasonable selection of depressor short-circuit impedance, the technical parameters such as converter power transformer loss in itself, cost, size can be caused to reach most
It is excellent, while and can is engaged the requirement for meeting straight-flow system with capacities of equipment such as converter valves.According to straight-flow system requirement and the change of current
The manufacturing capacity of transformer, it is determined that the major influence factors for influenceing converter power transformer short-circuit impedance are：Short circuit current, short circuit tolerance
Ability, magnetic leakage flux and the hot-spot and operational reliability that may occur, the rational design of short-circuit impedance so as to
It is resistant to all stress and its all operating condition that will be faced.Meanwhile the selection of short-circuit impedance will also influence converter power transformer
Cost, converter power transformer is designed as most effectively using raw material and loss can be made minimum close to its natural impedance.It is right
For extra-high voltage direct-current engineering converter power transformer, transport limitation need to consider when being also design converter power transformer short-circuit impedance value
One key factor, therefore the reasonable selection change of current becomes short-circuit impedance and shows particularly important in extra-high voltage direct-current engineering design.So
And currently in the research of short-circuit impedance design, often without the index and the design method of iteration quantified, only rely on design
The subjective sensation of personnel and transport limitation require the impedance of determination converter power transformer, and the impedance so selected is frequently not optimal resistance
It is anti-.
The content of the invention
To be set in view of the above-mentioned problems, it is an object of the invention to provide a kind of extra-high voltage direct-current engineering converter power transformer short-circuit impedance
Meter method, the factor for influenceing the selection of converter power transformer short-circuit impedance can be more covered comprehensively so that short-circuit impedance choice set is more
To be complete.
To achieve the above object, the present invention takes following technical scheme：A kind of extra-high voltage direct-current engineering converter power transformer is short
Road impedance design method, it is characterised in that comprise the following steps：1) systematic parameter and major loop of extra-high voltage direct-current engineering are determined
Input data；2) according to the systematic parameter and major loop input data of obtained extra-high voltage direct-current engineering, Yi Jiyi
Group converter power transformer short-circuit impedance assumption value, the major loop for carrying out extra-high voltage direct-current engineering calculate, determine boundary condition, changed
The preliminary recommendation of convertor transformer short-circuit impedance value；3) factor of analyzing influence converter power transformer short-circuit impedance selection, to the change of current
The preliminary recommendation of Transformer Short Circuit Impedance is checked, and is obtained converter power transformer short-circuit impedance under each influence factor and is alternatively collected；
4) alternatively collected according to converter power transformer short-circuit impedance under obtained each influence factor, it is alternative to choose each converter power transformer short-circuit impedance
The common factor of collection, the short-circuit impedance preferred value as extra-high voltage direct-current transmission engineering converter power transformer.
In the step 1), the systematic parameter of the extra-high voltage direct-current engineering includes the mode of connection, the system operation of system
Mode, operation control model, DC voltage, conveying capacity and decompression mode and decompression ratio；The major loop calculating parameter
Mainly include rated no-load DC voltage, maximum unloaded DC voltage, system maximum current, system minimum current, nominal DC
Voltage and current and converter power transformer nominal parameter under electric current, different load.
In the step 3), each determination method alternatively collected of converter power transformer short-circuit impedance comprises the following steps：1. root
The maximum short circuit current that can be born according to thyristor valves is horizontal, determines the short circuit current requirement of converter power transformer short-circuit impedance
Alternative collection；2. according to the limitation of railway and highway transportation condition, determine that the traffic condition requirement of converter power transformer short-circuit impedance is standby
Selected works；3. being required according to the commutation of converter valve, determine that the commutation requirement of converter power transformer short-circuit impedance alternatively collects；4. according to idle
The requirement of compensation capacity and harmonic current, determine that the reactive compensation requirements of converter power transformer short-circuit impedance alternatively collect；5. root
According to the dielectric level requirement of current conversion station, determine that the Insulation Coordination requirement of converter power transformer short-circuit impedance is alternative and collect；6. according to the change of current
The requirement of the manufacturing cost of transformer and relevant device, determines that the cost requirement of converter power transformer short-circuit impedance alternatively collects.
For the present invention due to taking above technical scheme, it has advantages below：1st, the present invention is according to extra-high voltage direct-current engineering
Systematic parameter and major loop input data, carry out major loop calculate, obtain the preliminary of converter power transformer short-circuit impedance value
Recommendation, for subjective selection short-circuit impedance in the prior art, result of calculation is objective, more conforms to actual conditions.2、
Preliminary recommendation of the invention based on short-circuit impedance, considers each factor for influenceing the selection of converter power transformer short-circuit impedance comprehensively,
Obtain the short-circuit impedance under the influence of each factor alternatively to collect, more fully covering influences the factor of converter power transformer impedance selection,
Restatement has calculated valve short circuit current, operating specified angle of overlap and maximum angle of overlap and dielectric level, reactive power consumption level etc.
Parameter so that short-circuit impedance choice set is more complete.The present invention can be widely applied to extra-high voltage direct-current engineering converter power transformer
In the design of short-circuit impedance, the optimum choice of short-circuit impedance is instructed.
Brief description of the drawings
Fig. 1 is that extra-high voltage direct-current engineering converter power transformer short-circuit impedance of the present invention chooses flow；
Fig. 2 is extra-high voltage direct-current engineering converter power transformer short-circuit impedance selection principle of the present invention.
Embodiment
The present invention is described in detail with reference to the accompanying drawings and examples.Drawings and examples are provided only
The present invention is more fully understood, they should not be interpreted as limitation of the present invention.
As shown in figure 1, a kind of extra-high voltage direct-current engineering converter power transformer short-circuit impedance design method provided by the invention, bag
Include following steps：
1) systematic parameter and major loop input data of extra-high voltage direct-current engineering are determined.
The mode of connection of the systematic parameter of extra-high voltage direct-current engineering including system, system operation mode, operation control model,
DC voltage, conveying capacity and decompression mode and decompression ratio.Major loop calculating parameter mainly includes rated no-load direct current
Pressure, maximum unloaded DC voltage, system maximum current, system minimum current, rated direct current, the voltage under different load and
Electric current and converter power transformer nominal parameter etc..
2) according to the systematic parameter and major loop input data of obtained extra-high voltage direct-current engineering, and one group of change of current
Transformer Short Circuit Impedance assumption value, the major loop for carrying out extra-high voltage direct-current engineering calculate, determine boundary condition, obtain change of current transformation
The preliminary recommendation of device short-circuit impedance value.
It is short according to the systematic parameter of extra-high voltage direct-current engineering and major loop input data, and one group of converter power transformer
The anti-assumption value of roadlock, straight-flow system major loop calculating is carried out, obtains side corresponding to this group of change of current converter power transformer short-circuit impedance value
Voltage, electric current, reactive power consumption, Trigger Angle, blow-out angle under boundary's condition value, including different load etc..Wherein, this group of transformer is short
Road impedance value determines that the maximum short circuit current level of converter valve in extra-high voltage direct-current engineering, the change of current become together with boundary condition value
The transportation clearance of depressor, commutation angle, dielectric level, the manufacturing cost etc. of reactive compensation capacity and converter power transformer.
3) factor of analyzing influence converter power transformer short-circuit impedance selection, the preliminary recommendation to converter power transformer short-circuit impedance
Value is checked, and is obtained converter power transformer short-circuit impedance under each influence factor and is alternatively collected.
Each determination method alternatively collected of converter power transformer short-circuit impedance comprises the following steps：
1. the maximum short circuit current that can be born according to thyristor valves is horizontal, converter power transformer short-circuit impedance is determined
The alternative collection of short circuit current requirement.
Short-circuit impedance determines the leakage inductance of converter power transformer, and then influences to flow through the electric current of thyristor valves, direct current system
When system breaks down, it may cause to increase by the short circuit current of thyristor valves.To prevent valve short-circuit impact electric current excessive
And valve components are damaged, converter power transformer should have sufficiently large leakage inductance, with limiting short-circuit current.According to thyristor valves energy
The maximum short circuit current that enough bears is horizontal, calculate different short-circuit impedances respectively corresponding to short circuit current, be met short circuit current
The alternative collection of short circuit current requirement under it is required that.For example, if thyristor valves allow maximum short circuit current to reach 60kA, count
Calculate short circuit current corresponding to different short-circuit impedances, you can obtain short circuit current requirement and alternatively collect.
2. according to the limitation of railway and highway transportation condition, determine that the traffic condition requirement of converter power transformer short-circuit impedance is standby
Selected works.
Because extra-high voltage direct-current engineering sending end converter power transformer will be limited by railway and highway transportation condition, for example,
When railway transportation condition is 13m (length) × 3.5m (width) × 4.85m (height), hauled weight 350t, the wherein change of current become short-circuit impedance
Meet railway transportation condition during minimum 20%.According to the limitation of railway transportation condition and highway transportation condition, transport is met
The alternative collection of traffic condition requirement of condition limitation.
3. being required according to the commutation of converter valve, determine that the commutation requirement of converter power transformer short-circuit impedance alternatively collects.
With the continuous improvement of converter power transformer short-circuit impedance, the angle of overlap of converter valve will gradually increase, and this will be further
Increase the probability of receiving end commutation failure.It is generally believed that the angle of overlap of receiving end converter valve is no more than 30 °.Meanwhile hindered according to short circuit
It is anti-that should be not more than by 21%, changed for commutation influence namely the interpretation of result of commutation angle, the short-circuit impedance of converter power transformer
The alternative collection of commutation requirement of convertor transformer short-circuit impedance.
4. according to the requirement of reactive compensation capacity and harmonic current, the idle benefit of converter power transformer short-circuit impedance is determined
Repay the alternative collection of requirement.
The short-circuit impedance of converter power transformer will influence the amplitude of harmonic current, increase short-circuit impedance, can reduce harmonic wave electricity
Amplitude is flowed, so as to reduce the alternating current filter group of required installing, reduces wave filter group cost.Short-circuit impedance is smaller, change of current transformation
The reactive power consumption of device is smaller, and angle of overlap is also smaller, and total reactive compensation capacity of required configuration is lower, and economy is better.According to
Harmonic current and reactive compensation capacity, obtain reactive compensation requirements and alternatively collect.
5. being required according to the dielectric level of current conversion station, determine that the Insulation Coordination requirement of converter power transformer short-circuit impedance is alternative
Collection.
Extra-high voltage direct-current engineering equipment dielectric level greatly improves compared to conventional engineering, and the impedance selection of converter power transformer should
The dielectric level of reduction system is considered as far as possible.Converter power transformer short-circuit impedance size directly affects the big of rated no-load DC voltage
Small, the lifting of short-circuit impedance can cause the increase of the increase harmonic levels of current of rated no-load DC voltage.Receiving end layering connects
AC system amplitude deviation and phase angular displacement are considered in the case of entering, further considers high and low end converter power transformer short-circuit impedance not
Balance, the increase of midpoint area harmonic content will be caused, thus further result in high-end dielectric level and improve.Short circuit is become according to the change of current
Influence result of calculation of the impedance to dielectric level, change of current impedance often increase one percentage point, ideal no-load direct voltage increase
About 2kV, corresponding switching overvoltage level are dielectric level increase about 6kV.Thus, calculate respectively corresponding to different short-circuit impedances
Switching overvoltage is horizontal, according to the requirement of the dielectric level of current conversion station, you can the insulation being met under dielectric level requirement is matched somebody with somebody
Close and require alternative collection.
6. being required according to the manufacturing cost of converter power transformer and relevant device, the cost of converter power transformer short-circuit impedance is determined
It is required that alternative collection.
When the direct current rated power of extra-high voltage direct-current engineering determines, short-circuit impedance is bigger, it is desired to which converter power transformer has
Bigger rated capacity.However, the either capacity of converter power transformer, or the capacity of reactive-load compensation equipment, can all influence phase
Answer the cost of equipment.Required according to the manufacturing cost of converter power transformer and relevant device, obtain converter power transformer short-circuit impedance
Cost requirement alternatively collects.
4) as shown in Fig. 2 alternatively collecting according to converter power transformer short-circuit impedance under obtained each influence factor, each change of current is chosen
The common factor that Transformer Short Circuit Impedance alternatively collects, the short-circuit impedance preferred value as extra-high voltage direct-current transmission engineering converter power transformer.
The various embodiments described above are merely to illustrate the present invention, wherein the structure of each part, connected mode and manufacture craft etc. are all
It can be varied from, every equivalents carried out on the basis of technical solution of the present invention and improvement, should not exclude
Outside protection scope of the present invention.
Claims (3)
1. a kind of extra-high voltage direct-current engineering converter power transformer short-circuit impedance design method, it is characterised in that comprise the following steps：
1) systematic parameter and major loop input data of extra-high voltage direct-current engineering are determined；
2) according to the systematic parameter and major loop input data of obtained extra-high voltage direct-current engineering, and one group of change of current transformation
Device short-circuit impedance assumption value, the major loop for carrying out extra-high voltage direct-current engineering calculate, determine boundary condition, it is short to obtain converter power transformer
The preliminary recommendation of road impedance value；
3) factor of analyzing influence converter power transformer short-circuit impedance selection, enters to the preliminary recommendation of converter power transformer short-circuit impedance
Row is checked, and is obtained converter power transformer short-circuit impedance under each influence factor and is alternatively collected；
4) alternatively collected according to converter power transformer short-circuit impedance under obtained each influence factor, choose each converter power transformer short-circuit impedance
The common factor alternatively collected, the short-circuit impedance preferred value as extra-high voltage direct-current transmission engineering converter power transformer.
2. a kind of extra-high voltage direct-current engineering converter power transformer short-circuit impedance design method as claimed in claim 1, its feature exist
In：In the step 1), the systematic parameter of the extra-high voltage direct-current engineering include the mode of connection of system, system operation mode,
Run control model, DC voltage, conveying capacity and decompression mode and decompression ratio；The major loop calculating parameter is mainly wrapped
Include rated no-load DC voltage, maximum unloaded DC voltage, system maximum current, system minimum current, rated direct current, no
With the voltage and current under load and converter power transformer nominal parameter.
3. a kind of extra-high voltage direct-current engineering converter power transformer short-circuit impedance design method as claimed in claim 1, its feature exist
In：In the step 3), each determination method alternatively collected of converter power transformer short-circuit impedance comprises the following steps：
1. the maximum short circuit current that can be born according to thyristor valves is horizontal, the short circuit of converter power transformer short-circuit impedance is determined
Current requirements alternatively collect；
2. according to the limitation of railway and highway transportation condition, determine that the traffic condition requirement of converter power transformer short-circuit impedance is alternative
Collection；
3. being required according to the commutation of converter valve, determine that the commutation requirement of converter power transformer short-circuit impedance alternatively collects；
4. according to the requirement of reactive compensation capacity and harmonic current, determine that the reactive-load compensation of converter power transformer short-circuit impedance will
Ask for perfection selected works；
5. being required according to the dielectric level of current conversion station, the alternative collection of Insulation Coordination requirement of converter power transformer short-circuit impedance is determined；
6. being required according to the manufacturing cost of converter power transformer and relevant device, the cost requirement of converter power transformer short-circuit impedance is determined
Alternative collection.
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| CN201710826427.0A CN107482666B (en) | 2017-09-14 | 2017-09-14 | Design method for short-circuit impedance of converter transformer in extra-high voltage direct current engineering |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112986812A (en) * | 2021-02-08 | 2021-06-18 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | High-energy arc short-circuit fault test simulation device and method for tap changer |
| CN112986811A (en) * | 2021-02-08 | 2021-06-18 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Testing device and method for converter transformer tap switch top cover pressure-bearing limit arc test |
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| US6088250A (en) * | 1998-05-29 | 2000-07-11 | The Aerospace Corporation | Power converters for multiple input power supplies |
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| CN206057431U (en) * | 2016-03-31 | 2017-03-29 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of converter power transformer load loss and short-circuit impedance pilot system |
| CN106707028A (en) * | 2016-12-30 | 2017-05-24 | 广东电网有限责任公司惠州供电局 | Transformer short-circuit impedance on-line monitoring method and device |
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2017
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112986812A (en) * | 2021-02-08 | 2021-06-18 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | High-energy arc short-circuit fault test simulation device and method for tap changer |
| CN112986811A (en) * | 2021-02-08 | 2021-06-18 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Testing device and method for converter transformer tap switch top cover pressure-bearing limit arc test |
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