CN101299052A - Electric generator one time frequency modulation real time quantitative analysis method based on phasor measuring technique - Google Patents
Electric generator one time frequency modulation real time quantitative analysis method based on phasor measuring technique Download PDFInfo
- Publication number
- CN101299052A CN101299052A CNA2007101350981A CN200710135098A CN101299052A CN 101299052 A CN101299052 A CN 101299052A CN A2007101350981 A CNA2007101350981 A CN A2007101350981A CN 200710135098 A CN200710135098 A CN 200710135098A CN 101299052 A CN101299052 A CN 101299052A
- Authority
- CN
- China
- Prior art keywords
- frequency
- time
- change
- unit
- modulation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Measuring Frequencies, Analyzing Spectra (AREA)
Abstract
A method for real-time quantitative-analyzing the primary frequency modulation of the generator based on the phasor measuring technique comprises the following steps: 1) selecting a starting time of frequency variation and a finishing time of frequency variation, and calculating the variation quantity of frequency; 2) selecting a starting time of the output variation of the assembly and the finishing time of the frequency variation, calculating the varying quantity of output; and 3) quantitative-calculating the difference modulation coefficient, delay time, dead zone of frequency modulation of the computer group. The method according to the invention has no specific requirement to the magnitude of frequency disturbance and time duration. The frequency disturbance in the electric network can be captured real-time. The disadvantage that formerly the performance of primary frequency modulation only can be qualitatively calculated off-line is compensated. The difference modulation coefficient, the delay time and dead zone of frequency modulation of the primary frequency modulation of the computer group can be accurately fixed quantitatively. Through the analysis to the variation trend to the frequencies and outputs before the primary modulation and after the primary modulation, not only the analysis by the program algorithm is facilitated, but also the artificial verifying the calculated result is facilitated. The effect of small disturbance is removed through setting an amplitude threshold of the peak frequency.
Description
Technical field
The present invention relates to a kind of electric generator one time frequency modulation real time quantitative analysis method, particularly a kind of electric generator one time frequency modulation real time quantitative analysis method based on phasor measuring technique.
Background technology
The general at present primary frequency modulation performance that adopts the qualitative measurement method to examine unit after bigger frequency jitter takes place electrical network, carries out the analysis of off-line by frequency and unit output before and after accident is taken place.This method has certain requirement to disturbance size, the duration of frequency, the purpose that can only be suitable for spot-check.Therefore need a kind of new wire examination method of exploitation, assess the unit primary frequency modulation performance accurately.The CPS standard has more been emphasized the effect of unit primary frequency modulation, must find an accurate and effective method to assess the adjusting function of unit primary frequency modulation., make to have synchronously in a large number that the target data are sent to the dispatching center when unified, with ripe based on the development gradually of the phasor measuring technique of GPS (GPS) for the analysis of unit primary frequency modulation performance provides good data basis.
Summary of the invention
Technical matters to be solved by this invention is, overcome the shortcoming of prior art, providing a kind of does not have particular requirement to frequency disturbance size, duration, and can catch the electric generator one time frequency modulation real time quantitative analysis method based on phasor measuring technique of the frequency disturbance in the electrical network in real time.
The technical solution adopted for the present invention to solve the technical problems is as follows: the electric generator one time frequency modulation real time quantitative analysis method based on phasor measuring technique comprises the following steps:
1) selecting frequency changes initial time and frequency change finish time, calculated rate variable quantity;
2) choose unit output and change initial time and frequency change finish time, the calculating variable quantity of exerting oneself;
3) difference coefficient of quantitative Analysis unit, time delay, frequency modulation dead band:
Unit difference coefficient computing formula is:
In the formula: δ is the unit difference coefficient; Δ f is a frequency variation; Δ P
GBe the unit output variable quantity, Δ f changing inversely; f
NBe rated frequency; P
GNBe the unit nominal output;
Steady frequency when mains frequency does not change is f0,
The initial moment t1 of frequency change promptly reaches before the extreme frequencies frequency ascendant trend the last time to pass through and calculate the amplitude threshold constantly as the initial moment of frequency, and the frequency of this moment is f1;
The frequency change t2 finish time, be value in the calculation interval as the corresponding finish time, descends or change rising into when frequency change trend is changed into by rising, and the change amplitude is when surpassing 0.02Hz by decline, frequency trend changes flex point and is frequency finish time, and the frequency of this moment is designated as f2;
Δ f=f2-f1 (2) in the formula (1)
Exerting oneself changes initial moment t3, and for unit output begins to adjust constantly with frequency change trend inverse change, exert oneself and be that p1, frequency are f3 this moment;
Exert oneself and change the t4 finish time: the unit output of T in the period that begins with the initial moment t3 that exerts oneself is worth most, and exerting oneself of this moment is p2;
Δ P in the formula (1)
GΔ P
G=p2-p1 (3)
With formula (2) (3) substitution formula (1), calculate unit difference coefficient δ;
The unit primary frequency modulation equals to exert oneself and adjust the difference in the initial moment and the initial moment of frequency: t3-t1 time delay;
The frequency modulation dead band of unit primary frequency modulation equals to exert oneself and adjusts the frequency variation in the initial moment: f3-f0.
Beneficial effect of the present invention is as follows: adopt method of the present invention, to the frequency disturbance size, the duration does not have particular requirement, can catch the frequency disturbance in the electrical network in real time; Remedied in the past can only qualitative calculated off-line primary frequency modulation performance deficiency, accurately quantitative Analysis unit primary frequency modulation difference coefficient, time delay, frequency modulation dead band; By watch window amplitude threshold is provided with less than unit primary frequency modulation dead band setting value, can obtain certain redundant data; Variation tendency by analyzing primary frequency modulation front and back frequency and exerting oneself both had been beneficial to the programmed algorithm analysis, also was convenient to manually examine result of calculation; By being provided with crest frequency amplitude threshold, remove the influence of microvariations.
Description of drawings
Fig. 1 is a generator primary frequency modulation schematic diagram of the present invention.
Embodiment
With reference to the accompanying drawings and in conjunction with the embodiments the present invention is described in further detail.But the invention is not restricted to given example.
Originally be that example has comprised that a mains frequency increases the process that exceeds the setting value unit output minimizing of frequency modulation dead band, adopts method real-time quantitative of the present invention to calculate primary frequency modulation performance.
Electric generator one time frequency modulation real time quantitative analysis method based on phasor measuring technique comprises the following steps:
(1) selecting frequency changes initial time and frequency change finish time, calculated rate variable quantity;
(2) choose unit output and change initial time and frequency change finish time, the calculating variable quantity of exerting oneself;
(3) difference coefficient of quantitative Analysis speed regulator, time delay, frequency modulation dead band.
When the mains frequency variation exceeded unit primary frequency modulation dead band, unit generally responded according to unit response target in short period such as 30s fully, and unit difference coefficient computing formula is:
In the formula: δ is the unit difference coefficient;
Δ f is a frequency variation;
Δ P
GBe the unit output variable quantity, with Δ f changing inversely;
f
NBe rated frequency, get 50Hz;
P
GNBe the unit nominal output.
According to computing formula (1), obtain difference coefficient δ, need at least to determine four points, to ask for Δ P
G, Δ f.
Remember that at first the steady frequency when mains frequency does not change is f0.
The initial moment t1 of frequency change: frequency ascendant trend the last time is passed through calculating amplitude threshold (0.033 or 0.067) constantly as the initial moment of frequency before reaching extreme frequencies.The frequency of this moment is designated as f1.
The frequency change t2 finish time: get value in the calculation interval as the corresponding finish time, this value is different from extreme value.Descend or change rising into by decline when frequency change trend is changed into by rising, and the change amplitude is when big, as surpassing 0.02Hz, frequency trend changes flex point and promptly is considered as frequency finish time.The frequency of this moment is designated as f2.
Δf＝f2-f1 (2)
Exert oneself and change initial moment t3: adopt unit output to begin to adjust constantly as exerting oneself the initial moment with frequency change trend inverse change.Exerting oneself of this moment is designated as p1, and frequency is designated as f3.
Exert oneself and change the t4 finish time: the T that begins with the initial moment t3 that exerts oneself in the period unit output of (suitably continuation) be worth most as exerting oneself the finish time.Exerting oneself of this moment is designated as p2.
ΔP
G＝p2-p1 (3)
Formula (2) (3) substitution formula (1) just can be calculated the unit difference coefficient.
The difference (t3-t1) of adjusting the initial moment and the initial moment of frequency of exerting oneself is unit primary frequency modulation time delay.
The frequency variation (f3-f0) of adjusting the initial moment of exerting oneself is the frequency modulation dead band of primary frequency modulation.
Accompanying drawing 1 is the primary frequency modulation schematic diagram.In order to show once complete primary frequency modulation process, be convenient to check and check result of calculation, watch window is set usually, shown in [T1-T4] among the figure.Watch window amplitude threshold is slightly less than unit primary frequency modulation dead band setting value.T1 gets the point that the last time in the frequency ascendant trend passes through amplitude (0.002Hz) threshold among the figure, and T4 gets the point that passes through amplitude threshold (0.002Hz) in the frequency downtrending for the first time, and T1 to the T4 time be no less than 30 seconds, guarantee to calculate desired data.
Quantitative test reality is carried out according to the calculation window [T2-T3] that primary frequency modulation dead band setting value limits.T2 gets the last time in the frequency ascendant trend and passes through the point that calculates amplitude threshold (0.033Hz) among the figure, T3 gets the point that passes through amplitude threshold (0.033Hz) in the frequency downtrending for the first time, and T2 to the T3 time is no less than 10 seconds, is used to leach short change procedure, guarantees computational accuracy.
This method also is provided with crest frequency amplitude threshold, and this value is greater than the primary frequency modulation dead band, is not less than 0.05Hz such as the extreme misery group of motors, and nuclear power generating sets are not less than 0.08Hz.If maximum frequency is less than this threshold value then think that this frequency adjustment process is microvariations in the calculation window, abandon calculating.
This method being provided with exerted oneself and regulated the amplitude threshold, has only when satisfying following two conditions and thinks that just unit primary frequency modulation input can be used for calculating.
Adjusting threshold: Δ P＞=0.4%Pn (Pn is the unit nominal output) exerts oneself
And Δ P* Δ f＜0 (unit output is with the variation changing inversely of system frequency)
With reference to the accompanying drawings 1, set stabilized frequency F0; The initial moment of frequency change is T2, and the frequency of this moment is designated as F2; Frequency change finish time is T5, and the frequency of this moment is designated as F5; Exerting oneself changes initial moment T6, and exerting oneself of this moment is designated as P6, and the frequency of this moment is designated as F6; Exerting oneself changes the T7 finish time, and exerting oneself of this moment is designated as P7
Exert oneself and adjust the time T 2=t4-initial moment t3 that the exerts oneself finish time that exerts oneself.
It is generally roughly approaching that adjustment time and the frequency of exerting oneself adjusted the time.Can suitably repair aforementioned four points in view of the above, affect greatly to avoid data self fluctuation and/or data error in measurement that program is calculated.
Use formula
Can calculate the difference coefficient of this unit under this disturbance.
This time this unit primary frequency modulation time delay is T6-T2 under disturbance.
The frequency modulation dead band of this unit primary frequency modulation is F6-F0 under the disturbance this time.
Claims (1)
1, based on the electric generator one time frequency modulation real time quantitative analysis method of phasor measuring technique, comprises the following steps:
1) selecting frequency changes initial time and frequency change finish time, calculated rate variable quantity;
2) choose unit output and change initial time and frequency change finish time, the calculating variable quantity of exerting oneself;
3) difference coefficient of quantitative Analysis unit, time delay, frequency modulation dead band:
Unit difference coefficient computing formula is:
In the formula: δ is the unit difference coefficient; Δ f is a frequency variation; Δ P
GBe the unit output variable quantity, Δ f changing inversely; f
NBe rated frequency; P
GNBe the unit nominal output;
Steady frequency when mains frequency does not change is f0,
The initial moment t1 of frequency change promptly reaches before the extreme frequencies frequency ascendant trend the last time to pass through and calculate the amplitude threshold constantly as the initial moment of frequency, and the frequency of this moment is f1;
The frequency change t2 finish time, be value in the calculation interval as the corresponding finish time, descends or change rising into when frequency change trend is changed into by rising, and the change amplitude is when surpassing 0.02Hz by decline, frequency trend changes flex point and is frequency finish time, and the frequency of this moment is designated as f2;
Δ f=f2-f1 (2) in the formula (1)
Exerting oneself changes initial moment t3, and for unit output begins to adjust constantly with frequency change trend inverse change, exert oneself and be that p1, frequency are f3 this moment;
Exert oneself and change the t4 finish time: the unit output of T in the period that begins with the initial moment t3 that exerts oneself is worth most, and exerting oneself of this moment is p2;
Δ P in the formula (1)
GΔ P
G=p2-p1 (3)
With formula (2) (3) substitution formula (1), calculate unit difference coefficient δ;
The unit primary frequency modulation equals to exert oneself and adjust the difference in the initial moment and the initial moment of frequency: t3-t1 time delay;
The frequency modulation dead band of unit primary frequency modulation equals to exert oneself and adjusts the frequency variation in the initial moment: f3-f0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101350981A CN100557453C (en) | 2007-11-08 | 2007-11-08 | Electric generator one time frequency modulation real time quantitative analysis method based on phasor measuring technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101350981A CN100557453C (en) | 2007-11-08 | 2007-11-08 | Electric generator one time frequency modulation real time quantitative analysis method based on phasor measuring technique |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101299052A true CN101299052A (en) | 2008-11-05 |
| CN100557453C CN100557453C (en) | 2009-11-04 |
Family
ID=40078943
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007101350981A Expired - Fee Related CN100557453C (en) | 2007-11-08 | 2007-11-08 | Electric generator one time frequency modulation real time quantitative analysis method based on phasor measuring technique |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100557453C (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102288842A (en) * | 2011-05-10 | 2011-12-21 | 中电普瑞科技有限公司 | WAMS (wide area measurement system)-based one-time frequency-modulating online evaluation method for eliminating AGC (automatic gain control) effect |
| CN102663255A (en) * | 2012-04-18 | 2012-09-12 | 陕西电力科学研究院 | Data automatic processing method for primary frequency modulation test |
| CN102707231A (en) * | 2012-05-16 | 2012-10-03 | 广东电网公司电力科学研究院 | Generator set primary frequency regulation analysis system based on matlab/simulink |
| CN102841249A (en) * | 2012-09-12 | 2012-12-26 | 国电南瑞科技股份有限公司 | Method for evaluating frequency quality of power grid |
| CN103166242A (en) * | 2011-12-14 | 2013-06-19 | 湖北省电力公司 | Computing method of generator difference-adjustment coefficient |
| CN103346619A (en) * | 2013-07-19 | 2013-10-09 | 国家电网公司 | Online monitoring and performance assessing method for primary frequency modulation of thermal generator set |
| CN103728523A (en) * | 2014-01-21 | 2014-04-16 | 国家电网公司 | Urban power grid yield measuring method |
| CN103954853A (en) * | 2014-01-26 | 2014-07-30 | 云南电力调度控制中心 | Area grid connection cluster primary-frequency-modulation assessment method and system |
| CN108321794A (en) * | 2018-01-19 | 2018-07-24 | 中电普瑞电力工程有限公司 | A kind of generating set governing system relates to network parameters on-line identification method and apparatus |
| CN110190611A (en) * | 2019-06-04 | 2019-08-30 | 国网山东省电力公司 | The primary frequency modulation bearing calibration and system of grid cyclic wave change rate based on PMU |
| CN110445196A (en) * | 2019-07-31 | 2019-11-12 | 南方电网科学研究院有限责任公司 | A kind of generating set primary frequency regulation effect judgment method |
-
2007
- 2007-11-08 CN CNB2007101350981A patent/CN100557453C/en not_active Expired - Fee Related
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102288842A (en) * | 2011-05-10 | 2011-12-21 | 中电普瑞科技有限公司 | WAMS (wide area measurement system)-based one-time frequency-modulating online evaluation method for eliminating AGC (automatic gain control) effect |
| CN102288842B (en) * | 2011-05-10 | 2015-10-28 | 中电普瑞科技有限公司 | Based on the primary frequency modulation on-line evaluation method that WAMS filtering AGC affects |
| CN103166242B (en) * | 2011-12-14 | 2014-12-31 | 湖北省电力公司 | Computing method of generator difference-adjustment coefficient |
| CN103166242A (en) * | 2011-12-14 | 2013-06-19 | 湖北省电力公司 | Computing method of generator difference-adjustment coefficient |
| CN102663255B (en) * | 2012-04-18 | 2015-08-19 | 陕西电力科学研究院 | A kind of automatic data processing method of primary frequency modulation test |
| CN102663255A (en) * | 2012-04-18 | 2012-09-12 | 陕西电力科学研究院 | Data automatic processing method for primary frequency modulation test |
| CN102707231A (en) * | 2012-05-16 | 2012-10-03 | 广东电网公司电力科学研究院 | Generator set primary frequency regulation analysis system based on matlab/simulink |
| CN102707231B (en) * | 2012-05-16 | 2015-06-10 | 广东电网公司电力科学研究院 | Generator set primary frequency regulation analysis system based on matlab/simulink |
| CN102841249A (en) * | 2012-09-12 | 2012-12-26 | 国电南瑞科技股份有限公司 | Method for evaluating frequency quality of power grid |
| CN103346619A (en) * | 2013-07-19 | 2013-10-09 | 国家电网公司 | Online monitoring and performance assessing method for primary frequency modulation of thermal generator set |
| CN103728523A (en) * | 2014-01-21 | 2014-04-16 | 国家电网公司 | Urban power grid yield measuring method |
| CN103954853A (en) * | 2014-01-26 | 2014-07-30 | 云南电力调度控制中心 | Area grid connection cluster primary-frequency-modulation assessment method and system |
| CN108321794A (en) * | 2018-01-19 | 2018-07-24 | 中电普瑞电力工程有限公司 | A kind of generating set governing system relates to network parameters on-line identification method and apparatus |
| CN108321794B (en) * | 2018-01-19 | 2022-09-02 | 中电普瑞电力工程有限公司 | Online identification method and device for grid-related parameters of generator set speed regulation system |
| CN110190611A (en) * | 2019-06-04 | 2019-08-30 | 国网山东省电力公司 | The primary frequency modulation bearing calibration and system of grid cyclic wave change rate based on PMU |
| CN110190611B (en) * | 2019-06-04 | 2020-11-06 | 国网山东省电力公司 | PMU-based primary frequency modulation correction method and system for power grid cycle change rate |
| CN110445196A (en) * | 2019-07-31 | 2019-11-12 | 南方电网科学研究院有限责任公司 | A kind of generating set primary frequency regulation effect judgment method |
| CN110445196B (en) * | 2019-07-31 | 2021-02-26 | 南方电网科学研究院有限责任公司 | Method for judging primary frequency modulation effect of generator set |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100557453C (en) | 2009-11-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100557453C (en) | Electric generator one time frequency modulation real time quantitative analysis method based on phasor measuring technique | |
| Larsson | Flicker emission of wind turbines during continuous operation | |
| CN109638879A (en) | Primary frequency modulation dynamic compensation adjustment system and method based on performance indicator assessment | |
| CN107345984B (en) | A kind of adaptive synchronicity phasor measurement method based on signal identification | |
| CN106918741A (en) | It is applied to the adaptively sampled phase difference correction method of frequency wide swings power network | |
| CN103823183B (en) | A kind of measuring method of synchronous generator stator open circuit transient time-constant | |
| CN105445582A (en) | Interconnection power grid primary frequency modulation responding performance assessment method | |
| CN102508055B (en) | Device and method for detecting wind power generation grid-connected system | |
| CN102236048B (en) | Method for measuring phasor frequency of electric system | |
| CN103616814A (en) | Synchronous sampling clock closed loop correcting method and system based on FPGA | |
| CN102928803B (en) | Electronic transformer checking device based on synchronization pulse output power supply | |
| CN101701983A (en) | Power system interharmonic wave detection method based on MUSIC spectrum estimation and HBF neural network | |
| CN109061302A (en) | A kind of wind power generator incorporated in power network group harmonic measure system converted based on EEMD and Hilbert | |
| CN106786567B (en) | A kind of online load modeling method based on PMU noise like data | |
| CN105243187B (en) | A kind of parameter influence degree analysis method based on transient stability measurement index | |
| CN101359042A (en) | Auto calibration method for single-phase electronic type electric energy meter | |
| CN101479613B (en) | Method for instantaneously determining rates of distortion of signals on an AC electrical network, and associated device | |
| CN105406521A (en) | Method for computing new index for evaluating unit AGC regulation performance | |
| CN108767905A (en) | Primary frequency modulation Commissioning Analysis method is carried out based on synchronized phase measurement device data | |
| CN109149566B (en) | Modeling method of simulation model for predicting lowest frequency point under high-power deficiency | |
| CN202939299U (en) | Electronic transformer calibration device based on synchronous pulse output power supply | |
| CN112505391B (en) | Frequency-adaptive alternating current signal effective value acquisition method | |
| CN113156200B (en) | Power grid low-frequency oscillation real-time monitoring device | |
| CN105529982B (en) | A kind of control method for pitch motor overtemperature anti-in wind power generating set | |
| CN107515332B (en) | Direct current electric energy metering device and method based on frequency spectrum analysis and synchronous sampling |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: NARI TECHNOLOGY DEVELOPMENT CO., LTD. Free format text: FORMER OWNER: STATE GRID ELECTRIC POWER RESEARCH INSITITUTE Effective date: 20140103 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| C56 | Change in the name or address of the patentee |
Owner name: STATE GRID ELECTRIC POWER RESEARCH INSITITUTE Free format text: FORMER NAME: NANJING AUTOMATION RESEARCH INSTITUTE, STATE GRID |
|
| CP01 | Change in the name or title of a patent holder |
Address after: Nanjing City, Jiangsu Province, 210003 South Shui Road No. 8 Patentee after: STATE GRID ELECTRIC POWER Research Institute Patentee after: EAST CHINA GRID Co.,Ltd. Patentee after: JIANGSU ELECTRIC POWER Co. Address before: Nanjing City, Jiangsu Province, 210003 South Shui Road No. 8 Patentee before: Nanjing Automation Research Institute Patentee before: EAST CHINA GRID Co.,Ltd. Patentee before: JIANGSU ELECTRIC POWER Co. |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20140103 Address after: High road Nanjing high tech Industrial Development Zone, Nanjing City, Jiangsu Province, No. 20 Patentee after: NARI TECHNOLOGY Co.,Ltd. Patentee after: EAST CHINA GRID Co.,Ltd. Patentee after: JIANGSU ELECTRIC POWER Co. Address before: Nanjing City, Jiangsu Province, 210003 South Shui Road No. 8 Patentee before: STATE GRID ELECTRIC POWER Research Institute Patentee before: EAST CHINA GRID Co.,Ltd. Patentee before: JIANGSU ELECTRIC POWER Co. |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091104 Termination date: 20131108 |