CN102565705B - Primary frequency-modulation quantitative evaluation method for eliminating secondary frequency modulation influence based on modulating control system - Google Patents
Primary frequency-modulation quantitative evaluation method for eliminating secondary frequency modulation influence based on modulating control system Download PDFInfo
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Abstract
The invention belongs to the technical field of measurement, and relates to a primary frequency-modulation quantitative evaluation method for eliminating a secondary frequency modulation influence based on a modulating control system. The method comprises the following steps of: 1, monitoring the rotate speed of a generator set, and judging whether a power grid generates effective disturbance; 2, monitoring the rotate speed of the generator set after effective disturbance, and judging whether the power grid finishes the effective disturbance; 3, based on a load set value of disturbance time, judging whether a secondary frequency modulation is involved in modulation, and calculating the modulating quantity; 4, and quantitatively analyzing and evaluating the rate of change of primary frequency-modulation speed and modulating electric quantity, judging whether the performance is qualified, and storing a result into a data file. According to the method, the defects of the prior art are overcome, the objective evaluation for primary frequency-modulation performance of the generator set is realized, performance evaluation results can be given, and the quality of electric energy and the operation stability of the power grid are really increased.
Description
Technical field
The present invention relates to a kind of primary frequency modulation method for quantitatively evaluating of eliminating frequency modulation frequency modulation impact based on regulation and control system, belong to field of measuring technique.
Background technology
Generating set primary frequency regulation function is to change fast unit load by unit regulation and control system, during with responsive electricity grid burst accident, frequency departs from fast, the important means of controlling mains frequency, guaranteeing power network safety operation, the important evidence of the moving performance index Shi Wang factory of primary frequency modulation and the decision-making of power monitoring department, examination.But by actual motion, analyzed, during primary frequency modulation action, be often accompanied by the action of frequency modulation frequency modulation, sometimes also often occur anti-tune, thereby interfere with the calculating of primary frequency modulation performance.By control theory, analyzed, unit load command value is generally generated by two parts: primary frequency modulation instruction, automatic generation control instruction or the operator that mains frequency deviation produces after conversion sets the frequency modulation frequency modulation instruction of generation, if therefore primary frequency modulation action in frequency modulation frequency modulation instruction lifting load process, unit load changes the joint effect that will inevitably be subject to the two, it is large that direction unanimously shows primary frequency modulation contribution load, otherwise contribute little.
Primary frequency modulation performance evaluation method and deficiency thereof are mainly manifested at present: 1, do not consider the impact of frequency modulation frequency modulation, make the distortion of primary frequency modulation performance index, cover unit primary frequency modulation actual act performance, caused primary frequency modulation policy optimization to lose specific aim, examination loses justice; 2, adopt the primary frequency modulation action impact of the method filtering frequency modulation frequency modulation of powertrace slope before, be only applicable to the situation of the necessary steady change of overall process frequency modulation frequency modulation of primary frequency modulation action, the actual conditions that can not adapt to frequency modulation frequency modulation random variation, have larger limitation.
Summary of the invention
The technical problem to be solved in the present invention is, overcome the shortcoming of prior art, a kind of primary frequency modulation method for quantitatively evaluating of eliminating frequency modulation frequency modulation impact based on regulation and control system is provided, realize the objective evaluation of unit primary frequency modulation performance and provide Evaluation results, conscientiously improving the electrical network quality of power supply and operation stability.The present invention adopts the data analysis of regulation and control system, has proposed to judge and eliminate with load setting value the method for frequency modulation frequency modulation impact, has contained all modes of frequency modulation frequency modulation on primary frequency modulation performance impact, good through practical application effect.
The technical solution adopted for the present invention to solve the technical problems is as follows:
A kind of primary frequency modulation method for quantitatively evaluating of eliminating frequency modulation frequency modulation impact based on regulation and control system of the present invention, is characterized in that: described method adopts genset regulation and control system data analysis; When evaluating, eliminates primary frequency modulation frequency modulation frequency modulation impact; It comprises the following steps:
Step 1, monitoring rotary speed of generator group, judge whether electrical network effective disturbance occurs;
When rotating speed, cross the duration in setting dead band and cross the rotating speed threshold value of setting over setting duration and the extreme value within the duration, judge electrical network generation effective disturbance;
There is the rotary speed of generator group after effective disturbance in step 2, monitoring, judges whether electrical network effective disturbance finishes;
There is constantly to rise within the stabilization time of setting rotating speed and pull back to dead band and judge that this disturbance constantly finishes in effective disturbance, otherwise is judged to the disturbance end time stabilization time of getting setting;
Step 3, based on disturbance period load setting value, judge whether frequency modulation frequency modulation participates in regulating, calculate regulated quantity;
Load setting value is the command value of frequency modulation frequency modulation target load after high load capacity, underload, rate limit, if over setting threshold value, judge that frequency modulation frequency modulation participates in regulating in disturbance period setting value, the time delay according to the unit load variation of actual measurement with set point change
, get
the regulated quantity of moment frequency modulation frequency modulation
, in formula
for
moment load setting value;
Step 4, quantitative analysis evaluation primary frequency modulation momentary speed variation, adjusting electric weight, judge that whether performance is qualified, and deposit result in data file.
It is scattered control system that load setting value of the present invention is taken from DCS under coordinated control mode; Under other control mode, taking from DEH is steam turbine digital formula electrohydraulic control system.
Beneficial effect of the present invention is: the method that 1, the present invention proposes has improved the accuracy that primary frequency modulation performance is evaluated, and Wei Wang factory and the decision-making of power monitoring department, examination provide technical support, can conscientiously improve the electrical network quality of power supply and operation stability.2, the method that the present invention proposes, directly adopts for unit and regulates the field data of controlling, and has reduced the impact of data transmission intermediate link; 3, the present invention proposes the method that judges and eliminate frequency modulation frequency modulation impact with load setting value, when judgement, set threshold value to reduce random small size interference, and consider the action delay link that load setting value and load exist between actual value and counted time delay of actual measurement, improved the confidence level of judgement and the accuracy of regulated quantity.4, the method that the present invention proposes, the all modes of frequency modulation frequency modulation on primary frequency modulation performance impact have been contained, applicable to the analysis of frequency modulation performance next time of unit different running control mode, also can be by setting value teletransmission to remote performance analysis platform, application prospect is extensive.
Accompanying drawing explanation
Fig. 1 is the position view of setting value in unit Logical Configuration described in the embodiment of the present invention.
Fig. 2 is load setting value described in the embodiment of the present invention, load, primary frequency modulation, frequency modulation frequency modulation and speed curves figure.
Embodiment
1, the present invention relates to a kind of primary frequency modulation method for quantitatively evaluating of eliminating frequency modulation frequency modulation impact based on regulation and control system, described method adopts genset regulation and control system data, monitoring rotary speed of generator group, after electrical network generation effective disturbance, judge whether frequency modulation frequency modulation participates in regulating, analyze the primary frequency modulation performance of eliminating frequency modulation frequency modulation impact, judge that whether performance is qualified and deposit result in data file.Concrete implementation step is as follows:
Step 1, monitoring rotary speed of generator group, judge whether electrical network effective disturbance occurs;
When rotating speed, cross the duration in setting dead band and cross the rotating speed threshold value of setting over setting duration and the extreme value within the duration, judge electrical network generation effective disturbance.
There is the rotary speed of generator group after effective disturbance in step 2, monitoring, judges whether electrical network effective disturbance finishes;
There is constantly to rise within the stabilization time of setting rotating speed and pull back to dead band and judge that this disturbance constantly finishes in effective disturbance, otherwise is judged to the disturbance end time stabilization time of getting setting.
Step 3, based on disturbance period load setting value, judge whether frequency modulation frequency modulation participates in regulating, calculate regulated quantity;
Load setting value is the command value of frequency modulation frequency modulation target load after high load capacity, underload, rate limit, if over setting threshold value, judge that frequency modulation frequency modulation participates in regulating in disturbance period setting value, the time delay according to the unit load variation of actual measurement with set point change
, get
the regulated quantity of moment frequency modulation frequency modulation
, in formula
for
moment load setting value.
Step 4, quantitative analysis evaluation primary frequency modulation momentary speed variation, contributing electricity, judge that whether performance is qualified, and deposit result in data file.
Be a representative instance of the present invention below, technical scheme the present invention being realized below in conjunction with this accompanying drawing is described further, but the example that the invention is not restricted to provide.
Embodiment
This example regulates the process of load decline, frequency modulation frequency modulation load up to describe with rise of rotational speed primary frequency modulation.
As shown in Figure 1: load setting value is the command value of frequency modulation frequency modulation target load after high load capacity, underload, rate limit, and load setting value is taken from DCS under coordinated control mode, under other control mode, takes from DEH.
As shown in Figure 2: curve 0 is load setting value curve, and curve 1 is frequency modulation frequency modulation curve, and curve 2 is realized load curve, curve 3 is actual primary frequency modulation curve, and curve 4 is speed curves.
At t
1rotating speed is crossed and is set dead band constantly, the duration surpasses setting duration and the extreme value within the duration is crossed the rotating speed threshold value of setting, judges electrical network generation effective disturbance.
There is constantly to rise within the stabilization time of setting rotating speed and pull back to dead band and judge that this disturbance constantly finishes in effective disturbance, otherwise be judged to the disturbance end time stabilization time of getting setting, is designated as t
2.
With prior art analysis: find out that by unit load curve 2 unit primary frequency modulation responds fast after rotating speed rising electrical network generation effective disturbance, load declines rapidly but progressively gos up subsequently, at the disturbance t finish time
2load and initial time t
1load equate, load does not change, momentary speed variation is defective, contributing electricity is curve 2 and the area of load initial value straight line institute compositing area, judges thus the correct but performance inconsistency lattice of primary frequency modulation action.
The methods analyst proposing with the present invention: after rotating speed rising electrical network generation effective disturbance, in the disturbance period, by load setting value curve 0, find out that set point change surpasses more greatly threshold value in primary frequency modulation course of action, judgement frequency modulation frequency modulation participates in regulating, and by the inventive method, is got
the regulated quantity of moment frequency modulation frequency modulation
obtain frequency modulation frequency modulation curve 1, curve 2 is subtracted each other and obtains primary frequency modulation operation curve 3 with curve 1 each moment load value.By curve 3, can be found out, the larger momentary speed variation of load variations is qualified, and contributing electricity is the area of curve 3 and load initial value straight line institute compositing area, judges that thus primary frequency modulation action is correct and performance is qualified.
Method contrast on prior art and the present invention's proposition is found: by curve 2, curve 3, can find out that frequency modulation frequency modulation is larger on the impact of primary frequency modulation judgement and performance index.
The method that the present invention proposes, adopts and is directly used in the field data that unit regulates control, has reduced the impact of data transmission intermediate link.
The present invention proposes the method that judges and eliminate frequency modulation frequency modulation impact with load setting value, when judgement, set threshold value to reduce random small size interference, and consider the action delay link that load setting value and load exist between actual value and counted time delay of actual measurement, improved the confidence level of judgement and the accuracy of regulated quantity correction.
The present invention proposes a kind of primary frequency modulation method for quantitatively evaluating of eliminating frequency modulation frequency modulation impact based on regulation and control system, realized the objective evaluation of unit primary frequency modulation performance and provided Evaluation results, can improve the accuracy that primary frequency modulation performance is evaluated, Wei Wang factory and the decision-making of power monitoring department, examination provide technical support, conscientiously improve the electrical network quality of power supply and operation stability.The present invention adopts regulation and control system data, has proposed to judge and eliminate with load setting value the method for frequency modulation frequency modulation impact, has contained all modes of frequency modulation frequency modulation on primary frequency modulation performance impact, good through practical application effect.
Claims (2)
1. based on regulation and control system, eliminate the primary frequency modulation method for quantitatively evaluating of frequency modulation frequency modulation impact, it is characterized in that, described method adopts genset regulation and control system data analysis; When evaluating, eliminates primary frequency modulation frequency modulation frequency modulation impact; It comprises the following steps:
Step 1, monitoring rotary speed of generator group, judge whether electrical network effective disturbance occurs;
When rotating speed, cross the duration in setting dead band and cross the rotating speed threshold value of setting over setting duration and the extreme value within the duration, judge electrical network generation effective disturbance;
There is the rotary speed of generator group after effective disturbance in step 2, monitoring, judges whether electrical network effective disturbance finishes;
There is constantly to rise within the stabilization time of setting rotating speed and pull back to dead band and judge that this disturbance constantly finishes in effective disturbance, otherwise is judged to the disturbance end time stabilization time of getting setting;
Step 3, based on disturbance period load setting value, judge whether frequency modulation frequency modulation participates in regulating, calculate regulated quantity;
Load setting value is the command value of frequency modulation frequency modulation target load after high load capacity, underload, rate limit, if over setting threshold value, judge that frequency modulation frequency modulation participates in regulating in disturbance period setting value, the time delay according to the unit load variation of actual measurement with set point change
, get
the regulated quantity of moment frequency modulation frequency modulation
, in formula, S is
moment load setting value;
Step 4, quantitative analysis evaluation primary frequency modulation momentary speed variation, adjusting electric weight, judge that whether performance is qualified, and deposit result in data file.
2. the primary frequency modulation method for quantitatively evaluating of eliminating frequency modulation frequency modulation impact based on regulation and control system according to claim 1, is characterized in that: load setting value is taken from DCS under coordinated control mode, under other control mode, takes from DEH.
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| 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 |
| CN103954853B (en) * | 2014-01-26 | 2017-10-27 | 云南电力调度控制中心 | A kind of grid-connected group of planes primary frequency modulation wire examination method in region and system |
| CN103777556B (en) * | 2014-02-12 | 2016-08-17 | 国家电网公司 | The preferential control method of monoblock primary frequency modulation and system |
| CN103900821A (en) * | 2014-04-22 | 2014-07-02 | 国家电网公司 | Primary frequency modulation function optimization experiment method of generator set |
| CN106410857A (en) * | 2016-04-08 | 2017-02-15 | 国网天津市电力公司 | Unit generating set primary frequency modulation function realization method |
| CN106326529B (en) * | 2016-08-09 | 2019-10-08 | 广东电网有限责任公司电力科学研究院 | A kind of checking system and method for hydroelectric units primary frequency modulation contributing electricity |
| CN106327057B (en) * | 2016-08-09 | 2019-11-01 | 广东电网有限责任公司电力科学研究院 | A kind of computing system and method for hydroelectric units primary frequency modulation theory movement electricity |
| CN106786665B (en) * | 2016-12-14 | 2019-11-12 | 国家电网公司华中分部 | A kind of generating set primary frequency regulation abnormal performance Online statistics analysis method |
| CN107202957B (en) * | 2017-06-05 | 2020-02-11 | 广东美的暖通设备有限公司 | Interference identification method, interference identification system and motor |
| CN107725123B (en) * | 2017-08-18 | 2020-07-14 | 中国神华能源股份有限公司 | Method and device for controlling a steam turbine |
| CN108039712B (en) * | 2017-12-05 | 2021-06-22 | 中国神华能源股份有限公司 | Primary frequency modulation method and device for steam turbine, storage medium and processor |
| CN109490676A (en) * | 2018-12-27 | 2019-03-19 | 国电南瑞科技股份有限公司 | New energy unit fm capacity on-line monitoring method and system |
| CN110048436B (en) * | 2019-04-30 | 2021-02-23 | 国家能源投资集团有限责任公司 | Power grid frequency modulation control method and device |
| CN112531769A (en) * | 2020-11-20 | 2021-03-19 | 华能国际电力股份有限公司汕头电厂 | Primary frequency modulation control method for thermal power plant |
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| CN1295859C (en) * | 2004-05-08 | 2007-01-17 | 上海慧能科技有限公司 | Method for measuring modulation efficiency of generating set primary frequency-modulation |
| 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 |
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