CN109378817B - A Stability Evaluation Method Based on Primary Frequency Modulation - Google Patents
A Stability Evaluation Method Based on Primary Frequency Modulation Download PDFInfo
- Publication number
- CN109378817B CN109378817B CN201811239378.1A CN201811239378A CN109378817B CN 109378817 B CN109378817 B CN 109378817B CN 201811239378 A CN201811239378 A CN 201811239378A CN 109378817 B CN109378817 B CN 109378817B
- Authority
- CN
- China
- Prior art keywords
- frequency
- frequency modulation
- deviation
- grid
- power
- 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.)
- Active
Links
- 238000011156 evaluation Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000004364 calculation method Methods 0.000 claims abstract description 8
- 238000005070 sampling Methods 0.000 claims description 9
- 230000005611 electricity Effects 0.000 claims 3
- 230000007423 decrease Effects 0.000 claims 1
- 230000007812 deficiency Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
Images
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
- Control Of Turbines (AREA)
Abstract
本发明涉及一种基于一次调频稳定性评价方法，通过计算得到一次调频正确动作率和速度变动率的评价结果。本发明中，一次调频正确动作率的统计，弥补以往调频特性分析指标的不足；采用汽轮机转速来计算电网频率，是一种快速采集电网频率的方法，能够在最短时间感应频率变化；速度变动率的统计，可以将采集数据及时进行处理，为后期分析机组调频性能提供参考；在计算电量贡献方法之中，采用有功功率与负荷指令的差值，减少因AGC调节变化对一次调频的影响，科学合理避开矛盾，提高调频贡献电量的真实性；为了避免频繁计算，按照以往机组调频特性，机组调频特性在10s之后方能充分体现，所以设置评价时段长度可以提高统计数据的合理性。
The invention relates to a method for evaluating the stability of primary frequency modulation, which obtains the evaluation results of the correct action rate and speed variation rate of primary frequency modulation through calculation. In the present invention, the statistics of the correct operation rate of a frequency regulation make up for the deficiency of the previous frequency regulation characteristic analysis index; the use of the steam turbine speed to calculate the grid frequency is a method of quickly collecting the grid frequency, which can induce the frequency change in the shortest time; the speed change rate The collected data can be processed in time to provide a reference for the later analysis of the frequency regulation performance of the unit; in the calculation of the power contribution method, the difference between the active power and the load command is used to reduce the influence of the AGC regulation change on the primary frequency regulation. Reasonably avoid contradictions and improve the authenticity of the power contributed by frequency regulation; in order to avoid frequent calculations, according to the frequency regulation characteristics of previous units, the frequency regulation characteristics of units can be fully reflected after 10s, so setting the length of the evaluation period can improve the rationality of statistical data.
Description
Technical Field
The invention belongs to the technical field of frequency modulation stability evaluation, and particularly relates to a stability evaluation method based on primary frequency modulation.
Background
With the increase of load and the increasing of the scale of the power grid, under the new situation of interconnection of an extra-high voltage power grid and a large-area power grid, the primary frequency modulation function of the unit can quickly respond to the sudden change of the power grid power, can obviously improve the frequency quality of the power grid, and plays a significant role in the safe and stable operation of the power grid. The evaluation method based on the primary frequency modulation stability is provided, and important data are provided for scientific analysis of the frequency modulation stability of the generator set.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a stability evaluation method based on primary frequency modulation, which utilizes the strong data processing capacity of a control system to solve the problem that the conventional frequency modulation data is not complete, and adopts a historical storage mode and a retrieval function to provide a basis for further researching the frequency modulation characteristics.
The invention adopts the following specific technical scheme:
a stability evaluation method based on primary frequency modulation is characterized in that: the method comprises the following steps:
the method includes the steps that the rotating speed of a steam turbine of a grid-connected unit is collected at regular time, and the rotating speed is converted into power grid frequency;
secondly, calculating the deviation between the power grid frequency and the standard frequency, and carrying out absolute value operation on the result;
if the absolute value of the deviation is larger than the set value, the next step is carried out;
otherwise, returning to the step;
fourthly, when the absolute value of deviation is reduced to a set value, the evaluation of the stage is finished, and the time length of the stage is recorded; otherwise, continuing timing;
fifthly, analyzing the data acquired at the stage when the time length is longer than 10 seconds to obtain an evaluation index;
returning to the step when the time length is less than or equal to 10 seconds;
the set value is 0.034 Hz;
converting the rotating speed w of the steam turbine into a power grid frequency f: f is w/60;
absolute deviation of grid frequency f from standard frequency f 0: Δ f | -f0 |;
the time length h: starting from the moment when the absolute value of deviation delta f is greater than 0.034Hz to the moment when the absolute value of deviation delta f is less than or equal to 0.034 Hz;
sampling time interval h 0: a minimum sampling period of the control system or the analysis system;
the sampling number n: n is h/h 0;
electric quantity contribution deviation value: Δ p-p 0;
electric quantity contribution peak value: Δ pm ═ max |. Δ p |;
electric quantity contribution amount W calculation method: w3600 × 1000 ×, Σ Δ p/n;
the rated power of the unit is pe, and the unit is MW;
when the grid frequency is greater than the standard frequency:
when the electric quantity contribution amount is negative, counting the number k1 of the primary frequency modulation correct actions to increase by 1, and keeping the number k2 of the primary frequency modulation error actions unchanged; when the electric quantity contribution amount is positive, k1 is unchanged, and k2 is increased once;
when the grid frequency is less than the standard frequency:
when the electric quantity contribution amount is positive, k1 is increased for 1 time, and k2 is unchanged; when the electric quantity contribution amount is negative, k1 is unchanged, and k2 is increased once;
primary frequency modulation correct action rate a: k1/(k1+ k 2);
velocity change rate δ: δ pe Δ f/(f0 Δ pm).
The invention has the advantages and beneficial effects that:
according to the stability evaluation method, the strong data processing capacity of the control system is utilized, the human resource consumption is reduced, the problem that the conventional frequency modulation data is incomplete is solved, a historical storage mode is adopted, a retrieval function can be adopted, and a basis is provided for further researching the frequency modulation characteristics; the statistics of the correct action rate of primary frequency modulation makes up the deficiency of the analysis index of the prior frequency modulation characteristic; the method for calculating the power grid frequency by adopting the rotating speed of the steam turbine is a method for quickly acquiring the power grid frequency, and can induce the frequency change in the shortest time; the statistics of the speed variation rate can process the acquired data in time and provide reference for later analysis of the frequency modulation performance of the unit; in the method for calculating the contribution of the electric quantity, the difference value of the active power and the load instruction is adopted, so that the influence of AGC (automatic gain control) regulation change on primary frequency modulation is reduced, contradictions are avoided scientifically and reasonably, and the authenticity of the frequency modulation contribution electric quantity is improved; in order to avoid frequent calculation, according to the frequency modulation characteristic of the conventional unit, the frequency modulation characteristic of the unit can be fully reflected after 10s, so that the reasonability of statistical data can be improved by setting the length of the evaluation time interval.
Drawings
Fig. 1 is an exemplary graph of each data.
Detailed Description
The present invention is further described in the following examples, but the technical content described in the examples is illustrative and not restrictive, and the scope of the present invention should not be limited thereby.
The invention discloses a stability evaluation method based on primary frequency modulation, which is characterized by comprising the following steps: the method comprises the following steps:
the method includes the steps that the rotating speed of a steam turbine of a grid-connected unit is collected at regular time, and the rotating speed is converted into power grid frequency;
secondly, calculating the deviation between the power grid frequency and the standard frequency, and carrying out absolute value operation on the result;
if the absolute value of the deviation is larger than the set value, the next step is carried out;
otherwise, returning to the step;
fourthly, when the absolute value of deviation is reduced to a set value, the evaluation of the stage is finished, and the time length of the stage is recorded; otherwise, continuing timing;
fifthly, analyzing data collected at the stage (including a data sampling time interval h0, active power p, a power instruction p0 and the like) to obtain an evaluation index (speed change rate delta, electric quantity contribution W, primary frequency modulation correct action rate A and the like) when the time length is longer than 10 seconds;
returning to the step when the time length is less than or equal to 10 seconds;
the set value is 0.034 Hz;
converting the rotating speed w of the steam turbine into a power grid frequency f: f is w/60;
absolute deviation of grid frequency f from standard frequency f 0: Δ f | -f0 |;
the time length h: starting from the moment when the absolute value of deviation delta f is greater than 0.034Hz to the moment when the absolute value of deviation delta f is less than or equal to 0.034 Hz;
sampling time interval h 0: a minimum sampling period of the control system or the analysis system; the sampling number n: n is h/h 0;
electric quantity contribution deviation value: Δ p-p 0; electric quantity contribution peak value: Δ pm ═ max |. Δ p |;
electric quantity contribution amount W calculation method: w3600 × 1000 ×, Σ Δ p/n;
the rated power of the unit is pe, and the unit is MW;
when the grid frequency is greater than the standard frequency:
when the electric quantity contribution amount is negative, counting the number k1 of the primary frequency modulation correct actions to increase by 1, and keeping the number k2 of the primary frequency modulation error actions unchanged; when the electric quantity contribution amount is positive, k1 is unchanged, and k2 is increased once;
when the grid frequency is less than the standard frequency:
when the electric quantity contribution amount is positive, k1 is increased for 1 time, and k2 is unchanged; when the electric quantity contribution amount is negative, k1 is unchanged, and k2 is increased once;
primary frequency modulation correct action rate a: k1/(k1+ k 2);
velocity change rate δ: δ pe Δ f/(f0 Δ pm).
According to the stability evaluation method, the strong data processing capacity of the control system is utilized, the human resource consumption is reduced, the problem that the conventional frequency modulation data is incomplete is solved, a historical storage mode is adopted, a retrieval function can be adopted, and a basis is provided for further researching the frequency modulation characteristics; the statistics of the correct action rate of primary frequency modulation makes up the deficiency of the analysis index of the prior frequency modulation characteristic; the method for calculating the power grid frequency by adopting the rotating speed of the steam turbine is a method for quickly acquiring the power grid frequency, and can induce the frequency change in the shortest time; the statistics of the speed variation rate can process the acquired data in time and provide reference for later analysis of the frequency modulation performance of the unit; in the method for calculating the contribution of the electric quantity, the difference value of the active power and the load instruction is adopted, so that the influence of AGC (automatic gain control) regulation change on primary frequency modulation is reduced, contradictions are avoided scientifically and reasonably, and the authenticity of the frequency modulation contribution electric quantity is improved; in order to avoid frequent calculation, according to the frequency modulation characteristic of the conventional unit, the frequency modulation characteristic of the unit can be fully reflected after 10s, so that the reasonability of statistical data can be improved by setting the length of the evaluation time interval.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811239378.1A CN109378817B (en) | 2018-10-23 | 2018-10-23 | A Stability Evaluation Method Based on Primary Frequency Modulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811239378.1A CN109378817B (en) | 2018-10-23 | 2018-10-23 | A Stability Evaluation Method Based on Primary Frequency Modulation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109378817A CN109378817A (en) | 2019-02-22 |
| CN109378817B true CN109378817B (en) | 2021-09-21 |
Family
ID=65400997
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811239378.1A Active CN109378817B (en) | 2018-10-23 | 2018-10-23 | A Stability Evaluation Method Based on Primary Frequency Modulation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109378817B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110429669B (en) * | 2019-07-30 | 2020-09-11 | 清华大学 | Master station side frequency control method for coordinating AGC and primary frequency modulation |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102323550A (en) * | 2011-09-09 | 2012-01-18 | 西北电网有限公司 | Primary frequency modulation adjusting performance determination method of generating set |
| CN102545215A (en) * | 2012-01-16 | 2012-07-04 | 河北省电力研究院 | Global-positioning-system-based quantitative analysis and evaluation method for primary frequency regulation performance of regional 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 |
| CN105445582A (en) * | 2015-11-26 | 2016-03-30 | 广东电网有限责任公司电力科学研究院 | Interconnection power grid primary frequency modulation responding performance assessment method |
| CN106300389A (en) * | 2016-08-22 | 2017-01-04 | 国家电网公司 | A kind of integrated evaluating method of generating set primary frequency regulation performance |
| CN106786665A (en) * | 2016-12-14 | 2017-05-31 | 国家电网公司华中分部 | A kind of generating set primary frequency regulation property abnormality Online statistics analysis method |
| CN107749631A (en) * | 2017-10-25 | 2018-03-02 | 国电南瑞科技股份有限公司 | Unit Primary frequency control ability predictor method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0920206D0 (en) * | 2009-11-18 | 2010-01-06 | Psymetrix Ltd | An electrical grid and method therefor |
-
2018
- 2018-10-23 CN CN201811239378.1A patent/CN109378817B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102323550A (en) * | 2011-09-09 | 2012-01-18 | 西北电网有限公司 | Primary frequency modulation adjusting performance determination method of generating set |
| CN102545215A (en) * | 2012-01-16 | 2012-07-04 | 河北省电力研究院 | Global-positioning-system-based quantitative analysis and evaluation method for primary frequency regulation performance of regional 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 |
| CN105445582A (en) * | 2015-11-26 | 2016-03-30 | 广东电网有限责任公司电力科学研究院 | Interconnection power grid primary frequency modulation responding performance assessment method |
| CN106300389A (en) * | 2016-08-22 | 2017-01-04 | 国家电网公司 | A kind of integrated evaluating method of generating set primary frequency regulation performance |
| CN106786665A (en) * | 2016-12-14 | 2017-05-31 | 国家电网公司华中分部 | A kind of generating set primary frequency regulation property abnormality Online statistics analysis method |
| CN107749631A (en) * | 2017-10-25 | 2018-03-02 | 国电南瑞科技股份有限公司 | Unit Primary frequency control ability predictor method |
Non-Patent Citations (2)
| Title |
|---|
| 基于电网频率波动特性的一次调频考核算法分析;王文营等;《河北电力技术》;20111025;第30卷(第05期);全文 * |
| 火电机组一次调频性能在线评价与考核;张辉等;《山东电力技术》;20151125;第42卷(第11期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109378817A (en) | 2019-02-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107885959A (en) | A kind of wind-powered electricity generation modeling and performance estimating method based on confidence equivalent power curve belt | |
| CN114123344A (en) | Method and device for evaluating inertia of power system based on adaptive recursive least squares | |
| CN116306798A (en) | A method and system for ultra-short-term wind speed prediction | |
| CN102545214A (en) | Method for evaluating reliability of wind farm having battery energy storage equipment | |
| WO2013174144A1 (en) | Continuous power flow calculation method based on wind power fluctuation rule | |
| CN113991702A (en) | Power system inertia evaluation method based on quasi-steady-state data | |
| CN109378817B (en) | A Stability Evaluation Method Based on Primary Frequency Modulation | |
| CN103336998B (en) | A kind of wind energy turbine set fluctuation of power stabilizes the optimized calculation method of target value | |
| CN105406521A (en) | Method for computing new index for evaluating unit AGC regulation performance | |
| CN113783237A (en) | Energy storage fast frequency modulation control method considering response delay | |
| CN113076639A (en) | Wind turbine generator operation evaluation method and system based on piecewise linear representation | |
| CN111064190B (en) | Wind power plant energy storage system configuration method based on wiener random process | |
| CN110378624B (en) | Thermal power generating unit primary frequency modulation index calculation method and system based on trend extraction | |
| CN102684210B (en) | Method for calculating steady state power fluctuation amplitude of AC tie line of interconnected systems in two regions | |
| CN115204946A (en) | A method and system for generating a building electricity load baseline considering weather factors | |
| CN110457800B (en) | Wind speed output conversion method of horizontal axis fan considering mechanical inertia | |
| CN109462227B (en) | Method for evaluating rapidity based on primary frequency modulation | |
| CN106300372B (en) | Wind-powered electricity generation field voltage control performance assessment method based on PMU data | |
| CN119324446A (en) | Wind power ultra-short-term prediction error correction method and system based on meteorological data | |
| CN111756039B (en) | Inertia estimation method of new energy power system based on probability statistics | |
| CN109149566A (en) | A kind of modeling method of the simulation model of the high-power minimum point prediction of missing lower frequency | |
| CN118432289A (en) | Distributed photovoltaic power generation grid-connected access monitoring and evaluating method | |
| CN109209751B (en) | Real-time dynamically corrected water turbine unit efficiency surface fitting method | |
| Lu | Multi-step ahead ultra-short-term wind power forecasting based on time series analysis | |
| WO2024037350A1 (en) | Control method and system for electric power of steam turbine generator of nuclear power plant |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |