CN103023409B - A kind of method by adjustment voltage auxiliary adjustment mains frequency - Google Patents
A kind of method by adjustment voltage auxiliary adjustment mains frequency Download PDFInfo
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- CN103023409B CN103023409B CN201210415491.7A CN201210415491A CN103023409B CN 103023409 B CN103023409 B CN 103023409B CN 201210415491 A CN201210415491 A CN 201210415491A CN 103023409 B CN103023409 B CN 103023409B
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- frequency
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- pressure regulation
- adjustment
- frequency modulation
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000005284 excitation Effects 0.000 claims abstract description 10
- 238000009987 spinning Methods 0.000 abstract description 11
- 230000008901 benefit Effects 0.000 abstract description 4
- 230000008859 change Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000004146 energy storage Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000007812 deficiency Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- H02P9/42—Arrangements for controlling electric generators for the purpose of obtaining a desired output to obtain desired frequency without varying speed of the generator
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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
- H02J3/34—Arrangements for transfer of electric power between networks of substantially different frequency
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention discloses a kind of method by adjustment voltage auxiliary adjustment mains frequency, in generator excitation controller, increase pressure regulation assist frequency modulation link, frequency departure signal is not input to adder by means of only the PSS link in excitation controller, described frequency departure signal is also input to pressure regulation simultaneously and assists in frequency modulation link, pressure regulation assists the output voltage signal of frequency modulation link to be also input to adder, the output signal of described adder affects the exciting voltage of generator, thus regulates mains frequency.System frequency, while minimizing spinning reserve, is returned to higher level, and has and respond advantage rapidly by the present invention as early as possible.
Description
Technical field
The present invention relates to a kind of method regulating mains frequency in network system, particularly relate to a kind of method by adjustment voltage auxiliary adjustment mains frequency.
Background technology
At present, along with building deepening continuously of strong intelligent grid, China's electrical network progressively enters the New Times that ultra high voltage puts into operation, new forms of energy extensively access.Ultra high voltage can be avoided transporting fire coal at a distance, making full use of southern water power, realizes resource complementation in China.So ultra high voltage may obtain rapidly and significant progress within following a period of time.But, although have significant advantage, the operation of ultra high voltage is also with the problem of serving, and has to be solved.
Because ultra high voltage power is huge, more than 10% of province's network capacity amount may be accounted for.When the ultra high voltage that has an accident loses, the power shortage caused is equally very huge.If N-1 rule traditionally, just need even more fired power generating unit identical with ultra high voltage capacity as spinning reserve, this is very uneconomical.If but there is no enough spinning reserves, extra high voltage line is once fault, and system just necessary a large amount of UFLS is qualified with sustain pulse frequency, and this can affect the end user of One's name is legion, causes confusion.In addition, also should see, even if when being equipped with enough spinning reserves, ultra high voltage breaks down also still may cause UFLS.This is because there is creep speed restriction in spinning reserve unit, make up the power shortage that ultra high voltage causes and need a period of time, a few minutes may be needed after fault could to allow frequency retrieval normal level, and during this period, system still may need UFLS due to underfrequency.
In the problem that solution power shortage causes mains frequency to fluctuate, carried out many-sided research both at home and abroad.Particularly in recent years, wind-powered electricity generation injects ratio and progressively increases, and has carried out many-sided research to tackle the wind power output power fluctuation caused that fluctuates.Such as can increase energy storage device (comprising superconducting energy storage, compressed-air energy storage, battery energy storage etc.), can increase to double-fed wind power generator and adjust difference characteristic etc.But a large amount of power shortages that these methods cause when all cannot tackle ultra high voltage catastrophic failure, reply means now or traditional UFLS; Aspect again, although also there are some to carry out the research of UFLS according to load sensitivity, by selecting highly sensitive load off-load, try hard to obtain better effect while minimizing excision load total amount, but the effect that this method can obtain also remains limited.
As for adjustment voltage reduce load gain merit consume method, according to the data grasped at present, thread both domestic and external all occasionally has use, the reduction voltage that such as domestic thread is had a mind to sometimes is to reduce the meritorious consumption of load, Ontario, Canada also allows, when deficiency for subsequent use, voltage is reduced 2.5%-5%, but these ways are all the ancillary methods accidentally used, and do not carry out detailed and deep research to it.This may be because for a long time, and people think meritorious and frequency dependence always, and idle relevant with voltage, when steady operation, voltage is also seldom utilized with the contact of gaining merit.
But, in transient stability study, the relation of voltage and power is also widely used.Such as, in the transient process after accident, maintaining set end voltage, can to improve stability be exactly because set end voltage is higher mean that to send power more, so can reduce acceleration area.PSS(power system stabilizer, PSS) be also change by reconditioner terminal voltage the power that generator sends, provide damping with this.This all shows that the relation between meritorious and voltage can be utilized to maintain system stability.In fact, this relation also can be used when stable state completely.
Summary of the invention
The object of this invention is to provide a kind of method adjusting voltage auxiliary adjustment mains frequency, while minimizing spinning reserve, system frequency can be returned to higher level as early as possible.
The present invention adopts following technical proposals: a kind of method by adjustment voltage auxiliary adjustment mains frequency, in generator excitation controller, increase pressure regulation assist frequency modulation link, frequency departure signal is not input to adder by means of only the PSS link in excitation controller, described frequency departure signal is also input to pressure regulation simultaneously and assists in frequency modulation link, pressure regulation assists the output voltage signal of frequency modulation link to be also input to adder, the output signal of described adder affects the exciting voltage of generator, thus regulates mains frequency.
Described pressure regulation assists frequency modulation link to be inertial element.
The present invention is in order to solve the problem, propose a kind of method by adjustment voltage auxiliary adjustment mains frequency, the method can with primary frequency modulation and AGC(automatic generation amount control AGC(Automatic Generation Control), it is a critical function in EMS EMS, which control exerting oneself of frequency modulation unit, to meet the custom power demand of constantly change, and make system be in economic running status) acting in conjunction, while minimizing spinning reserve, system frequency is returned to higher level as early as possible; In addition, pressure regulation of the present invention is assisted frequency modulation method also to have and is responded advantage rapidly.
Accompanying drawing explanation
Fig. 1 is the excitation system structure chart comprising PSS;
Fig. 2 increases the excitation system structure chart that frequency modulation link is assisted in pressure regulation;
Fig. 3 is the analogous diagram that this method compares with additive method.
Embodiment
As shown in Figure 2, a kind of method by adjustment voltage auxiliary adjustment mains frequency of the present invention, increases pressure regulation and assists frequency modulation link (FRVC), frequency departure signal in generator excitation controller
affect except exciting voltage except being input to adder by PSS link, described frequency departure signal is also input to pressure regulation simultaneously and assists in frequency modulation link, pressure regulation assists the output signal of frequency modulation link to be also input to adder, the output signal of described adder exports the voltage signal after final adjustment, and the voltage signal of output regulates mains frequency by AGC.Wherein said pressure regulation assists frequency modulation link to be inertial element, and described inertial element can be realized by circuit or program.
Comparison diagram 2 and Fig. 1 can find out, the pressure regulation newly increased assists frequency modulation link the same with PSS, all with frequency departure
for input variable.Difference is, present PSS realizing route comprises high-pass filtering link, so constant frequency departure can not affect set end voltage.The pressure regulation newly increased assists frequency modulation link then can according to constant frequency departure reconditioner terminal voltage.Also can be understood as, 0.1-2Hz's
change meeting is by PSS path effects set end voltage, and the perdurabgility being less than 0.1Hz is longer
change then assists frequency modulation (FRVC) path effects set end voltage by pressure regulation.
If there is large power shortage, system frequency is caused to reduce,
to be a constant negative value, now pressure regulation assists frequency modulation link (FRVC link) generator terminal voltage can be decreased, thus indirectly affects the active power consumption of load voltage and load, and reaches with this and put forward high-frequency object.As shown in Figure 3, be the result of certain example system being carried out to simulation calculation, before accident, system always generates electricity is 21.679 (mark systems), loses the generator that size is 4.369 in accident.As can be seen from Figure 3, when system occurs that size is the power shortage of the whole network capacity 20.15%, 10s after accident, use pressure regulation to assist frequency modulation to compare with not using, frequency can improve 0.465Hz, and correspondence is two-wheeled UFLS at least, and, pressure regulation assists frequency modulation after raising accident while frequency, and also the sum of exerting oneself of primary frequency modulation action Hou Ge power plant is reduced to 19.87 from 21.35, the generate output of saving also can improve mains frequency further after primary frequency modulation terminates.
Moreover, pressure regulation assists frequency modulation also to there is an advantage, is exactly that response is rapid.When ultra high voltage loses so high-power vacancy generation, even if there are enough spinning reserves, and primary frequency modulation can rely on accumulation of heat tune difference characteristic desirably to issue additional a large amount of power, and this response also cannot be sustained.The power of the assembling unit may fall after rise subsequently, is then very long climbing process, and after at least wanting a few minutes, frequency could be recovered normally under the effect of AGC, and this process medium frequency is still on the low side, also inevitably wants a large amount of load rejection.And pressure regulation assists frequency modulation can while minimizing primary frequency modulation adjustment amount, the adjustment process returning to upper frequency (0.9946) is shortened to tens seconds, and this is significant to system when accident.
The present invention can affect mains frequency by adjustment exciting voltage, Main Basis is: the active power of load consumption and voltage are relevant, therefore the active power that voltage can reduce load needs is reduced, so when there is a large amount of frequency vacancy, frequency decrease, just be necessary to reduce voltage, make up the power shortage of spinning reserve deficiency.The voltage of the whole network is low by 5%, just can economize the spinning reserve (according to constant-impedance 30%, constant current 40%, invariable power 30% calculates) of about 5%, avoid the UFLS of the whole network capacity 5%.Concerning most load node, voltage is low is also feasible to 0.9, and the power shortage that can make up like that is just more.
Load itself has frequency characteristic and voltage characteristic, and absorbing when frequency and voltage reduces gains merit all can reduce.But in fact, voltage initiatively can only be utilized to reduce the meritorious rule reduced, and frequency can not be utilized to reduce the meritorious rule reduced.This is because voltage is a local value, can distinguish sensitive load and insensitive load, go step-down (rural power voltage is even reduced to 0.8, and also problem is little) disaggregatedly.But frequency is the parameter of the whole network, if reduce frequency, all load generatings all can be affected, and the blade of steam turbine, the pump in power plant and the user such as blower fan, textile enterprise can not bear excessive frequency change.
Certainly, this method is not can the frequent a kind of method used, and it should be the same with UFLS, only uses in critical, but this small probability event exists still.When critical, of short duration reduction voltage, allow spinning reserve increase exert oneself simultaneously, the fired power generating unit being in cold conditions is allowed to drive as early as possible, proceed to normal state again, of short duration may sacrifice rate of qualified voltage although do like this, the quantity of excision load can be reduced, both compare, or what is gained is more than what is lost.Can also by directly specifying excitation system Vref, regulate load tap changer, the means such as switched capacitor and Static Var Compensator realize FRVC, and these means are widely used in AVC system, when realizing FRVC, only need corresponding instruction to pass to AVC system.
Claims (2)
1. the method by adjustment voltage auxiliary adjustment mains frequency, it is characterized in that: in generator excitation controller, increase pressure regulation assist frequency modulation link, frequency departure signal is not input to adder by means of only the PSS link in excitation controller, described frequency departure signal is also input to pressure regulation simultaneously and assists in frequency modulation link, pressure regulation assists the output voltage signal of frequency modulation link to be also input to adder, the pressure regulation increased assists frequency modulation link then can according to constant frequency departure reconditioner terminal voltage, the output signal of described adder affects the exciting voltage of generator, thus adjustment mains frequency.
2. the method by adjustment voltage auxiliary adjustment mains frequency according to claim 1, is characterized in that: described pressure regulation assists frequency modulation link to be inertial element.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210415491.7A CN103023409B (en) | 2012-10-26 | 2012-10-26 | A kind of method by adjustment voltage auxiliary adjustment mains frequency |
| PCT/CN2012/086551 WO2014063413A1 (en) | 2012-10-26 | 2012-12-13 | Method for auxiliary regulating frequency of grid by regulating voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210415491.7A CN103023409B (en) | 2012-10-26 | 2012-10-26 | A kind of method by adjustment voltage auxiliary adjustment mains frequency |
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| CN103023409A CN103023409A (en) | 2013-04-03 |
| CN103023409B true CN103023409B (en) | 2015-08-05 |
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| CN201210415491.7A Active CN103023409B (en) | 2012-10-26 | 2012-10-26 | A kind of method by adjustment voltage auxiliary adjustment mains frequency |
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| WO (1) | WO2014063413A1 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104767197B (en) * | 2014-01-06 | 2017-05-03 | 北京源深节能技术有限责任公司 | Primary frequency regulation synchronous response method and device |
| CN104485676B (en) * | 2014-12-31 | 2016-09-14 | 广东电网有限责任公司电力科学研究院 | Generating set primary frequency regulation non-linear governor-side PSS control method |
| CN104617589B (en) * | 2015-02-06 | 2017-01-25 | 广东电网有限责任公司电力科学研究院 | Control method and system for improving one-time frequency-modulated control stability of generator set |
| CN107528330B (en) * | 2017-10-10 | 2023-11-07 | 赫普能源环境科技股份有限公司 | Power grid frequency modulation system based on voltage reduction refrigeration unit for thermal power plant |
| CN107528351A (en) * | 2017-10-10 | 2017-12-29 | 赫普科技发展（北京）有限公司 | A kind of power grid frequency modulation system based on electric compression heat pump for thermal power plant |
| CN107612001B (en) * | 2017-10-10 | 2023-12-29 | 赫普能源环境科技股份有限公司 | Power grid frequency modulation system for combining electric compressor with electric power storage facility of thermal power plant |
| CN109873455B (en) * | 2017-12-05 | 2023-11-14 | 中国电力科学研究院有限公司 | AGC frequency modulation method and system for energy storage auxiliary thermal power unit |
| CN108599253A (en) * | 2018-05-25 | 2018-09-28 | 国家电网公司西北分部 | A kind of combination control method of Wind turbines field grade primary frequency modulation and damping control |
| CN111224394B (en) * | 2019-10-14 | 2022-10-04 | 中国电力科学研究院有限公司 | Method and system for determining frequency deviation after power fluctuation of electric power system |
| CN112398143A (en) * | 2020-10-28 | 2021-02-23 | 许继集团有限公司 | New energy power station frequency modulation control method and system containing energy storage |
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| CN101119095A (en) * | 2007-07-19 | 2008-02-06 | 清华大学 | Large destabilization real-time simulation system based on nonlinear robust power system stabilizer |
| CN101350526A (en) * | 2008-08-28 | 2009-01-21 | 华东电力试验研究院有限公司 | Method for coordinating and setting whole net PSS base on single machine infinite system |
| CN101447679A (en) * | 2008-09-17 | 2009-06-03 | 中国电力科学研究院 | Method for implementing parallel power system stabilizer |
| CN102146812A (en) * | 2010-02-09 | 2011-08-10 | 浙江省电力公司 | Actual-measurement modeling method for prime mover and speed governor thereof of electric power system |
| CN102570486A (en) * | 2012-02-10 | 2012-07-11 | 东南大学 | PSS (power system stabilizer) parameter optimizing method for inhibiting multi-mode low-frequency oscillation |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100418284C (en) * | 2006-09-04 | 2008-09-10 | 天津大学 | Method for realizing composite power system stabilizer |
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- 2012-10-26 CN CN201210415491.7A patent/CN103023409B/en active Active
- 2012-12-13 WO PCT/CN2012/086551 patent/WO2014063413A1/en active Application Filing
Patent Citations (5)
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|---|---|---|---|---|
| CN101119095A (en) * | 2007-07-19 | 2008-02-06 | 清华大学 | Large destabilization real-time simulation system based on nonlinear robust power system stabilizer |
| CN101350526A (en) * | 2008-08-28 | 2009-01-21 | 华东电力试验研究院有限公司 | Method for coordinating and setting whole net PSS base on single machine infinite system |
| CN101447679A (en) * | 2008-09-17 | 2009-06-03 | 中国电力科学研究院 | Method for implementing parallel power system stabilizer |
| CN102146812A (en) * | 2010-02-09 | 2011-08-10 | 浙江省电力公司 | Actual-measurement modeling method for prime mover and speed governor thereof of electric power system |
| CN102570486A (en) * | 2012-02-10 | 2012-07-11 | 东南大学 | PSS (power system stabilizer) parameter optimizing method for inhibiting multi-mode low-frequency oscillation |
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| CN103023409A (en) | 2013-04-03 |
| WO2014063413A1 (en) | 2014-05-01 |
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Inventor after: Wei Qiang Inventor after: Guo Weimin Inventor after: Tang Yaohua Inventor before: Wei Qiang Inventor before: Guo Weimin Inventor before: Liu Zhanhui Inventor before: Zhang Wentao Inventor before: Zhang Xiaoke |
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Address after: 450052 Songshan, Zhengzhou, Henan District No. 27 South Road, No. 85 Patentee after: STATE GRID HENAN ELECTRIC POWER CORPORATION ELECTRIC POWER SCIENCE Research Institute Patentee after: State Grid Corporation of China Address before: 450052 Songshan South Road, Henan, No. 85, No. Patentee before: Henan Electric Power Corporation Electric Power Science Research Institute Patentee before: State Grid Corporation of China |
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Effective date of registration: 20161213 Address after: 450052 Songshan, Zhengzhou, Henan District No. 27 South Road, No. 85 Patentee after: STATE GRID HENAN ELECTRIC POWER CORPORATION ELECTRIC POWER SCIENCE Research Institute Patentee after: HENAN ENPAI HIGH-TECH GROUP Co.,Ltd. Patentee after: State Grid Corporation of China Address before: 450052 Songshan, Zhengzhou, Henan District No. 27 South Road, No. 85 Patentee before: STATE GRID HENAN ELECTRIC POWER CORPORATION ELECTRIC POWER SCIENCE Research Institute Patentee before: State Grid Corporation of China |
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Address after: 450052 No. 85 South Songshan Road, 27 District, Henan, Zhengzhou Co-patentee after: Henan jiuyu enpai Power Technology Co.,Ltd. Patentee after: STATE GRID HENAN ELECTRIC POWER CORPORATION ELECTRIC POWER SCIENCE Research Institute Co-patentee after: State Grid Corporation of China Address before: 450052 No. 85 South Songshan Road, 27 District, Henan, Zhengzhou Co-patentee before: HENAN ENPAI HIGH-TECH GROUP Co.,Ltd. Patentee before: STATE GRID HENAN ELECTRIC POWER CORPORATION ELECTRIC POWER SCIENCE Research Institute Co-patentee before: State Grid Corporation of China |