CN106655932B - Overseas minor scale power net project generator depth encourages method for limiting into phase pair is low - Google Patents
Overseas minor scale power net project generator depth encourages method for limiting into phase pair is low Download PDFInfo
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- CN106655932B CN106655932B CN201611228768.XA CN201611228768A CN106655932B CN 106655932 B CN106655932 B CN 106655932B CN 201611228768 A CN201611228768 A CN 201611228768A CN 106655932 B CN106655932 B CN 106655932B
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- 238000000034 method Methods 0.000 title claims abstract description 10
- 230000005284 excitation Effects 0.000 claims abstract description 18
- 238000012795 verification Methods 0.000 claims abstract description 5
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
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- Engineering & Computer Science (AREA)
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- Control Of Eletrric Generators (AREA)
Abstract
The invention belongs to technical field of electric power more particularly to a kind of smaller project generator depth of overseas electrical network capacity to encourage method for limiting into phase pair is low.In overseas minor scale power net system engineering, in DCS system it is fixed it is a set of it is low encourage limitation, different active corresponding generator's power and angles are calculated by formula and encourage restrictive curve for 70 ° low, low restrictive curve logic of encouraging is made in DCS system；Verification DCS is low to encourage limitation, i.e. PQ limitation and loss of exicitation curve fitting relationship, and DCS is low to be encouraged limitation and first act, and PQ limitation movement, field loss protection acts；Generator is operated into phase, when depth encourages limitation action value up to DCS is low, DCS alarm, limitation " excitation reduction " operation, DCS is low to be encouraged limitation and throw and move back；Select DCS is low to encourage limitation " investment " when unit is normal, when scheduling requirement unit depth, when reaching that DCS is low to encourage limitation action value, DCS is low to encourage limitation " exiting ".The low of reactive power is provided according to different active power and encourages limitation, effectively avoids maloperation.
Description
Technical field
The invention belongs to technical field of electric power more particularly to a kind of smaller project generator depth of overseas electrical network capacity into phase
It is double low to encourage method for limiting.I.e. existing excitation system is low encourage limitation under conditions of, increase in a set of DCS system low encourages limit
System, when DCS is low encourage limitation and reach action value when, limitation operations staff carries out " excitation reduction " operation, and issues corresponding alarm signal
Number.
Background technique
When minor scale power net project generator depth is into phase in overseas, low in excitation system encourages limitation generally according to power supply agreement
Requirement adjusted, deeper into phase depth due to what is required in power supply system, generator is not able to satisfy for stability margin
It is required that is, generator's power and angle δ is less than 70 °.In some cases, in order to reach unit power supply agreement requirement, generator operation
Generator rotor angle may already exceed 85 °, this is very unfavorable for generator stable operation.
Summary of the invention
For above-mentioned problems of the prior art, the present invention provides a kind of overseas minor scale power net project generator depth
Method for limiting is encouraged into phase pair is low, main purpose is that limitation unit enters the insufficient region of stability margin.In order to meet power supply agreement
Requirement, what is be arranged in excitation system low encourage limitation and cannot limit and remind operations staff to run generator to stability margin
Insufficient region.
In order to achieve the above-mentioned object of the invention, the present invention is achieved in the following ways:
Overseas minor scale power net project generator depth into phase it is double it is low encourage method for limiting, be in minor scale power net system engineering in overseas,
In DCS system it is fixed it is a set of it is low encourage limitation, specifically comprise the following steps:
A, calculating different active corresponding generator's power and angles by formula is that 70 ° low encourages restrictive curve；
B, low restrictive curve logic of encouraging is made in DCS system；
C, verification DCS is low encourages limitation, and the low i.e. PQ of limitation that encourages of excitation system is limited, and loss of exicitation curve fitting relationship,
DCS is low to be encouraged limitation and acts first, and then movement, field loss protection finally act for PQ limitation；
D, when operations staff operates generator into phase, when depth reaches that DCS is low to encourage limitation action value, DCS alarm and is limited
Operations staff's further " excitation reduction " operation selects the low throwing for encouraging limitation of DCS to move back according to the actual situation；
E, when unit normal condition, DCS is low encourages limitation " investment " for selection, when scheduling requirement unit depth, and reaches
DCS is low when encouraging limitation action value, selects low " the exiting " for encouraging limitation of DCS.
Described to calculate different active corresponding generator's power and angles by formula be that 70 ° low encourages restrictive curve, is referred to logical
It crosses following formula (1) and calculates generated power and idle curve corresponding to generator's power and angle δ less than 70 °:
In formula (1): P is generator active power, and U generator terminal voltage, Xq is generator synchronous reactance, and Q is hair
Motor reactive power, δ are generator's power and angle.
The invention has the advantages and beneficial effects that:
(1) the low of reactive power can be provided according to different active power encourage limitation.
(2) maloperation that can effectively avoid operations staff, when being more than 70 ° of generator rotor angle into phase depth, DCS can be limited simultaneously
Alarm.And it can choose whether to carry out continuing to operate according to the actual situation.
(3) to based on overseas minor scale power net project generator depth, into phase, it is low in DCS that low in excitation system encourages limitation
Encouraging limitation can effectively cooperate.
In the following with reference to the drawings and specific embodiments, the present invention is described in further detail.
Detailed description of the invention
Fig. 1 is control flow chart of the present invention；
Fig. 2, which is that generator is low in DCS, encourages restrictive curve；
Fig. 3 is to encourage limitation and field loss protection fitting curves for reality is low.
Specific embodiment
The present invention, which is that a kind of overseas minor scale power net project generator depth phase modifier group pair is low, encourages method for limiting, as shown in Figure 1,
Fig. 1 is control flow chart of the present invention, and Fig. 2, which is that generator is low in DCS, encourages restrictive curve, and Fig. 3, which is that reality is low, encourages limitation and loss of excitation guarantor
Protect fitting curves.
In overseas in minor scale power net system engineering, in some cases, the unit for protocol requirement of powering has surpassed into phase depth
It has crossed generator operation generator rotor angle and has been limited to 70 °, in order to limit the maloperation of operations staff, equally set in DCS system a set of
Low to encourage limitation, the low requirement encouraged limitation and meet generator operation generator rotor angle of this set, i.e., generator rotor angle is less than 70 °.Operations staff can root simultaneously
Limitation progress " throwing is moved back " is encouraged according to actual conditions are low to DCS.
A kind of overseas minor scale power net project generator depth of the present invention encourages method for limiting into phase pair is low, specifically includes following step
It is rapid:
1, calculating different active corresponding generator's power and angles by formula (1) is that 70 ° low encourages restrictive curve.
2, low restrictive curve logic of encouraging is made in DCS system.DCS indicates dcs.
3, DCS is low encourages limitation for verification, and excitation system is low to encourage limitation (PQ limitation), such as with loss of exicitation curve fitting relationship
Shown in Fig. 3.
4, when operations staff operates generator into phase, when depth reaches that DCS is low to encourage limitation action value, DCS alarm and is limited
Operations staff's further " excitation reduction " operation.Operations staff can select low " throwing is moved back " for encouraging limitation of DCS according to the actual situation.
5, when unit normal condition, DCS is low encourages limitation " investment " for selection, when scheduling requirement unit depth, and reaches
DCS is low when encouraging limitation action value, selects low " the exiting " for encouraging limitation of DCS.
The present invention in the specific implementation, is further added by that set of excitation system is low to encourage limitation in dcs, active in generator difference
In the case where power, by calculating generated power corresponding to generator's power and angle δ less than 70 ° and idle to formula (1)
Curve, as shown in Figure 2.
In formula (1): P is generator active power, and U generator terminal voltage, Xq is generator synchronous reactance, and Q is hair
Motor reactive power, δ are generator's power and angle.
Under a certain active power, generator is into during phase, and when reactive power is less than, DCS is low to be encouraged limitation and have work value,
Forbid operations staff to connect and carries out " excitation reduction " operation.By that can be cancelled by DCS button after confirmation, DCS is low to encourage limitation progress
Subsequent operations.
Overseas certain project pair is low to encourage limitation example, as shown in Table 1 and Table 2.
1. calculating different active corresponding generator's power and angles by formula (1) is that 70 ° low encourages restrictive curve.Such as Fig. 3
Middle DCS is low to encourage restrictive curve.
2, low restrictive curve logic of encouraging is made in DCS system.DCS indicates dcs.
3, DCS is low encourages limitation for verification, and excitation system is low to encourage limitation (PQ limitation), with loss of exicitation curve fitting relationship.
DCS as shown in Figure 3 is low to encourage restrictive curve, PQ restrictive curve, and loss of excitation characteristic curve has preferable matching relationship, i.e. DCS is low to encourage limit
System acts first, and then movement, field loss protection finally act for PQ limitation.
4, when operations staff operates generator into phase, when depth reaches that DCS is low to encourage limitation action value, DCS alarm and is limited
Operations staff's further " excitation reduction " operation.Operations staff can select low " throwing is moved back " for encouraging limitation of DCS according to the actual situation.
5, when unit normal condition, DCS is low encourages limitation " investment " for selection, when scheduling requirement unit depth, and reaches
DCS is low when encouraging limitation action value, selects low " the exiting " for encouraging limitation of DCS.
Parameter list needed for table .1 leading phase test calculates
Table .2 generator leading phase test data
Claims (1)
1. overseas minor scale power net project generator depth encourages method for limiting into phase pair is low, it is characterized in that: minor scale power net system work in overseas
Cheng Zhong, in DCS system it is fixed it is a set of it is low encourage limitation, specifically comprise the following steps:
A, calculating different active corresponding generator's power and angles by formula is that 70 ° low encourages restrictive curve；Pass through following formula
(1) generated power and idle curve corresponding to generator's power and angle δ less than 70 ° are calculated:
In formula (1): P is generator active power, and U generator terminal voltage, Xq is generator synchronous reactance, and Q is generator
Reactive power, δ are generator's power and angle；
B, low restrictive curve logic of encouraging is made in DCS system；
C, verification DCS is low encourages limitation, and excitation system is low to encourage limitation i.e. PQ limitation, and with loss of exicitation curve fitting relationship, DCS is low
It encourages limitation to act first, then movement, field loss protection finally act for PQ limitation；
D, when operations staff operates generator into phase, when depth reaches that DCS is low to encourage limitation action value, DCS alarm and limits operation
Personnel's further " excitation reduction " operation selects the low throwing for encouraging limitation of DCS to move back according to the actual situation；
E, when unit normal condition, DCS is low encourages limitation " investment " for selection, and when scheduling requirement unit depth, and it is low to reach DCS
When encouraging limitation action value, low " the exiting " for encouraging limitation of DCS is selected.
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| CN106972551B (en) * | 2017-05-11 | 2020-08-07 | 王小雨 | Generator, power transmission line and machine network early warning pre-control method and system |
| CN110954775B (en) * | 2019-12-31 | 2021-08-27 | 中国华能集团清洁能源技术研究院有限公司 | Generator, power transmission line stability degree measuring method and power grid control system |
| CN117494094A (en) * | 2023-10-19 | 2024-02-02 | 中国长江电力股份有限公司 | Prediction method for maximum phase advance depth of hydro-generator limited by loss of excitation protection |
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| CN101510747A (en) * | 2009-03-27 | 2009-08-19 | 华中科技大学 | Excitation control system architecture and control method for marine diesel brushless double fed shaft generator |
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