CN103023409A - Method for auxiliarily adjusting power grid frequency through adjusting voltage - Google Patents
Method for auxiliarily adjusting power grid frequency through adjusting voltage Download PDFInfo
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- CN103023409A CN103023409A CN2012104154917A CN201210415491A CN103023409A CN 103023409 A CN103023409 A CN 103023409A CN 2012104154917 A CN2012104154917 A CN 2012104154917A CN 201210415491 A CN201210415491 A CN 201210415491A CN 103023409 A CN103023409 A CN 103023409A
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000005284 excitation Effects 0.000 claims abstract description 11
- 230000033228 biological regulation Effects 0.000 claims description 22
- 238000009987 spinning Methods 0.000 abstract description 11
- 230000008901 benefit Effects 0.000 abstract description 5
- 230000008859 change Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000004146 energy storage Methods 0.000 description 4
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- 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
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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
- H02P9/42—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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Abstract
The invention discloses a method for auxiliarily adjusting a power grid frequency through adjusting voltage. An auxiliary frequency adjusting link is additionally arranged in a generator excitation controller; a frequency deviation signal is not only input into an adding device through a PSS (Power System Stabilizator) link in the excitation controller, but also the frequency deviation signal is input into the voltage-adjusting auxiliary frequency adjusting link; an output voltage signal of the voltage-adjusting auxiliary frequency adjusting link is also input into the adding device; and an output signal of the adding device influences excitation voltage of a generator, so as to adjust the power grid frequency. According to the method disclosed by the invention, spinning reservation is reduced and the system frequency is recovered to the higher level as soon as possible; and the method also has the advantage of rapid responding.
Description
Technical field
The present invention relates to regulate in a kind of network system the method for mains frequency, relate in particular to a kind of by adjusting the method for voltage auxiliary adjustment mains frequency.
Background technology
At present, along with building deepening continuously of strong intelligent grid, China's electrical network has progressively entered the New Times that ultra high voltage puts into operation, new forms of energy extensively access.Ultra high voltage can be avoided transporting at a distance fire coal, take full advantage 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 problem of serving also is with in the operation of ultra high voltage, has to be solved.
Because ultra high voltage power is huge, may account for more than 10% of province's network capacity amount.In the situation that the ultra high voltage that has an accident loses, the power shortage that causes is equally very huge.If according to traditional N-1 rule, just need identical with the ultra high voltage capacity in addition more fired power generating unit as spinning reserve, this is very uneconomical.If but there are not enough spinning reserves, in case the extra high voltage line fault, just UFLSs are qualified with sustain pulse frequency in a large number in system, the end user that this can affect One's name is legion causes confusion.In addition, should see also that even in the situation that has been equipped with enough spinning reserves, ultra high voltage breaks down and also still may cause UFLS.This is because there is the creep speed restriction in the spinning reserve unit, remedy the power shortage that ultra high voltage causes and need a period of time, may need a few minutes could allow the frequency retrieval normal level after the fault, during this period, system may be still owing to underfrequency needs UFLS.
Solving power shortage and cause aspect the problem of mains frequency fluctuation, carried out many-sided research both at home and abroad.Particularly in recent years, wind-powered electricity generation injects ratio and progressively increases, and goes out the power fluctuation that fluctuation causes and has carried out many-sided research in order to tackle wind-powered electricity generation.Such as increasing energy storage device (comprising superconducting energy storage, compressed-air energy storage, battery energy storage etc.), can increase to double-fed wind power generator and transfer poor characteristic etc.But a large amount of power shortages that these methods cause in the time of all can't tackling the ultra high voltage catastrophic failure, the reply means of this moment or traditional UFLS; Aspect again, although also being arranged, some carry out the research of UFLS according to load sensitivity, by selecting highly sensitive load off-load, try hard to when reducing excision load total amount, obtain better effect, but the effect that this method can obtain also remains limited.
Reduce the meritorious method that consumes of load as for adjusting voltage, data according to present grasp, thread both domestic and external all has use by chance, for example the domestic thread reduction voltage of having a mind to sometimes reduces the meritorious consumption of load, the Ontario, Canada also allows when deficiency for subsequent use lower voltage 2.5%-5%, but these ways all are the accidental ancillary methods that uses, and it are not carried out detailed and deep research.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 also seldom is utilized with the contact of gaining merit.
But, in transient stability research, the relation of voltage and power also is widely used.For example, in the transient process after accident, keep that set end voltage can improve that stability is exactly because set end voltage is higher and mean that to send power more, so can reduce the acceleration area.The PSS(power system stabilizer, PSS) also is to change the power that generator is sent by the reconditioner terminal voltage, provides damping with this.This shows that all the relation between meritorious and voltage can be utilized to keep system stability.In fact, this relation also can be used when stable state fully.
Summary of the invention
The purpose of this invention is to provide a kind of method of adjusting voltage auxiliary adjustment mains frequency, can when reducing spinning reserve, system frequency be returned to higher level as early as possible.
The present invention adopts following technical proposals: a kind of by adjusting the method for voltage auxiliary adjustment mains frequency, in generator excitation controller, increase the auxiliary frequency modulation link of pressure regulation, the frequency departure signal not only is input to adder by the PSS link in the excitation controller, described frequency departure signal also is input in the auxiliary frequency modulation link of pressure regulation simultaneously, the output voltage signal of the auxiliary frequency modulation link of pressure regulation also is input to adder, the output signal of described adder affects the exciting voltage of generator, thereby regulates mains frequency.
The auxiliary frequency modulation link of described pressure regulation is inertial element.
The present invention is in order to address the above problem, proposed a kind of by adjusting the method for voltage auxiliary adjustment mains frequency, the method can be controlled AGC(Automatic Generation Control with primary frequency modulation and AGC(automatic generation amount), it is a critical function among the EMS EMS, it is controlling exerting oneself of frequency modulation unit, to satisfy the custom power demand that constantly changes, and make system be in economic running status) acting in conjunction, when reducing 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 rapidly advantage.
Description of drawings
Fig. 1 is the excitation system structure chart that comprises PSS;
Fig. 2 is for increasing the excitation system structure chart of the auxiliary frequency modulation link of pressure regulation;
Fig. 3 is this method and additive method analogous diagram relatively.
Embodiment
As shown in Figure 2, the present invention is a kind of by adjusting the method for voltage auxiliary adjustment mains frequency, increases the auxiliary frequency modulation link (FRVC) of pressure regulation in generator excitation controller, the frequency departure signal
Affect the exciting voltage except being input to adder by the PSS link, described frequency departure signal also is input in the auxiliary frequency modulation link of pressure regulation simultaneously, the output signal of the auxiliary frequency modulation link of pressure regulation also is input to adder, the output signal of described adder is exported the voltage signal after the final adjusting, and the voltage signal of output is regulated mains frequency by AGC.The auxiliary frequency modulation link of wherein said pressure regulation is inertial element, and described inertial element can be realized by circuit or program.
Comparison diagram 2 and Fig. 1 can find out that the auxiliary frequency modulation link of the pressure regulation that increases newly is the same with PSS, all with frequency departure
Be input variable.Difference is, comprises the high-pass filtering link in the present PSS realizing route, so constant frequency departure can not affect set end voltage.The auxiliary frequency modulation link of the pressure regulation that increases newly then can be according to constant frequency departure reconditioner terminal voltage.Also can be understood as, 0.1-2Hz's
Change can be by PSS path effects set end voltage, and less than the perdurabgility of 0.1Hz long
Change then by auxiliary frequency modulation (FRVC) the path effects set end voltage of pressure regulation.
If large power shortage occurs, cause system frequency to reduce,
To be a constant negative value, the auxiliary frequency modulation link (FRVC link) of pressure regulation this moment can decrease generator terminal voltage, thereby indirectly affects the active power consumption of load voltage and load, and reaches with this and to put forward high-frequency purpose.As shown in Figure 3, be the result who certain example system is carried out simulation calculation, the total generating of system is 21.679 (mark systems) before the accident, has lost size in the accident and be a generator of 4.369.As can be seen from Figure 3, when system's appearance size is the power shortage of the whole network capacity 20.15%, 10s after the accident, use the auxiliary frequency modulation of pressure regulation to compare with not using, frequency can improve 0.465Hz, and correspondence is the two-wheeled UFLS at least, and, the auxiliary frequency modulation of pressure regulation also reduces to 19.87 to the sum of exerting oneself of each power plant after the primary frequency modulation action from 21.35 after the raising accident in the frequency, and the generate output of saving also can further improve mains frequency after primary frequency modulation finishes.
Moreover, also there is an advantage in the auxiliary frequency modulation of pressure regulation, is exactly that response is rapid.When ultra high voltage lost so high-power vacancy and occurs, even enough spinning reserves are arranged, and primary frequency modulation can rely on accumulation of heat to issue additional a large amount of power according to the poor characteristic of accent of expectation, and this response also cannot be sustained.The power of the assembling unit may fall after rise subsequently, then is very long climbing process, want a few minutes at least after frequency could under the effect of AGC, recover normally, this process medium frequency is still on the low side, also inevitably wants a large amount of load rejections.And the auxiliary frequency modulation of pressure regulation can be when reducing the primary frequency modulation adjustment amount, and the adjustment process that will return to upper frequency (0.9946) shortens to tens seconds, and this is significant to system when accident.
The present invention can affect mains frequency by adjusting exciting voltage, Main Basis is: the active power that load consumes is relevant with voltage, therefore reduce voltage and can reduce the active power that load needs, so when a large amount of frequency vacancy, frequency decline occurring, just be necessary to reduce voltage, remedy the power shortage of spinning reserve deficiency.The voltage of the whole network is low by 5%, just can economize about 5% spinning reserve (according to constant-impedance 30%, constant current 40%, permanent power 30% calculating), avoids the UFLS of the whole network capacity 5%.Concerning most load node, voltage is low also to be feasible to 0.9, and the power shortage that works remedies is just more.
Load itself has frequency characteristic and voltage characteristic, and absorbing when frequency and lower voltage gains merit all can reduce.But in fact, can only initiatively utilize the meritorious rule that reduces of lower voltage, and can not utilize frequency to reduce the meritorious rule that reduces.This is because voltage is local value, can distinguish sensitive load and insensitive load, goes step-down (rural power voltage even be reduced to 0.8 also problem is little) disaggregatedly.But frequency is the parameter of the whole network, if reducing work frequency, all load generatings all can be affected, and the blade of steam turbine, the pump in power plant and the users such as blower fan, textile enterprise can not bear excessive frequency change.
Certainly, this method is not the frequent a kind of method used of meeting, and it should be the same with UFLS, only uses in critical, and still this small probability event exists still.When critical, of short duration reduction voltage, allow simultaneously the spinning reserve increase exert oneself, allow the fired power generating unit that is in cold conditions drive as early as possible, change again normal state over to, although done like this may be of short duration sacrifice rate of qualified voltage, can reduce the quantity that excision is loaded, both compare, or what is gained is more than what is lost.Can also be 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 the AVC system, when realizing FRVC, only corresponding instruction need to be passed to the AVC system and get final product.
Claims (2)
1. one kind by adjusting the method for voltage auxiliary adjustment mains frequency, it is characterized in that: in generator excitation controller, increase the auxiliary frequency modulation link of pressure regulation, the frequency departure signal not only is input to adder by the PSS link in the excitation controller, described frequency departure signal also is input in the auxiliary frequency modulation link of pressure regulation simultaneously, the output voltage signal of the auxiliary frequency modulation link of pressure regulation also is input to adder, the output signal of described adder affects the exciting voltage of generator, thereby regulates mains frequency.
2. according to claim 1 by adjusting the method for voltage auxiliary adjustment mains frequency, it is characterized in that: the auxiliary frequency modulation link of described pressure regulation is 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 |
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| Application Number | Priority Date | Filing Date | Title |
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| 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 true CN103023409A (en) | 2013-04-03 |
| CN103023409B CN103023409B (en) | 2015-08-05 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104485676A (en) * | 2014-12-31 | 2015-04-01 | 广东电网有限责任公司电力科学研究院 | Method for controlling power system stabilizer on primary frequency modulation nonlinear speed regulation side of generator set |
| CN104617589A (en) * | 2015-02-06 | 2015-05-13 | 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 |
| 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 |
| 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 |
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| 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 |
| 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 |
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2012
- 2012-10-26 CN CN201210415491.7A patent/CN103023409B/en active Active
- 2012-12-13 WO PCT/CN2012/086551 patent/WO2014063413A1/en active Application Filing
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| CN1945919A (en) * | 2006-09-04 | 2007-04-11 | 天津大学 | Method for realizing composite power system stabilizer |
| 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 |
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Cited By (4)
| 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 |
| CN104485676A (en) * | 2014-12-31 | 2015-04-01 | 广东电网有限责任公司电力科学研究院 | Method for controlling power system stabilizer on primary frequency modulation nonlinear speed regulation side of generator set |
| CN104617589A (en) * | 2015-02-06 | 2015-05-13 | 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 |
| 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 |
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| CN103023409B (en) | 2015-08-05 |
| 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 |