CN111446723A - Method for calculating rotating speed unequal rate of coal-fired generator set - Google Patents
Method for calculating rotating speed unequal rate of coal-fired generator set Download PDFInfo
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- CN111446723A CN111446723A CN201910930912.1A CN201910930912A CN111446723A CN 111446723 A CN111446723 A CN 111446723A CN 201910930912 A CN201910930912 A CN 201910930912A CN 111446723 A CN111446723 A CN 111446723A
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- 238000004088 simulation Methods 0.000 description 2
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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Abstract
The invention relates to a method for calculating the unequal rate of the rotating speed of a coal-fired generator set, which comprises the steps of firstly quitting AGC control, and putting coordination, valve control or power control; then acquiring the rotating speed before disturbance, the main steam flow before disturbance and the load before disturbance; simulating the rotating speed, and recording the main steam flow and the load after disturbance after the disturbance is stable; then calculating the rotation speed deviation, and per-unit changing the rotation speed deviation; then, calculating a per-unit reference of the main steam flow, and calculating a main steam flow change value; then calculating the per unit change of the main steam flow; and finally, calculating the rotating speed unequal rate. According to the invention, the change of the load is reflected by the main steam flow, so that the purpose of rapidness and accuracy is achieved, and meanwhile, the tedious unit conversion and parameter conversion links are saved by adopting per unit value calculation, so that a scientific calculation method is provided for improving the calculation speed and the authenticity of the unequal rate of the rotating speed.
Description
Technical Field
The invention belongs to the technical field of power generation, and particularly relates to a method for calculating the rotating speed unequal rate of a coal-fired generator set.
Background
With the development of economy, the requirements of industrial manufacture and residential life on the quality of electric energy are higher and higher. The grid frequency is one of the important standards for measuring the quality of electric energy and is deeply taken into consideration by the power department. The primary frequency modulation function of the coal-fired generator set is used as a direct means of the frequency modulation function of the power grid, and the quality of the power grid frequency is directly influenced by the quality of the function realization. Therefore, the primary frequency modulation management of the coal-fired generator set is enhanced, and the method has important significance for maintaining the safety of a power grid. One of the important indexes for measuring the primary frequency modulation function of the coal-fired generator set is the rotating speed unequal rate, the traditional rotating speed unequal rate calculation is obtained by adopting the ratio of load variation and frequency difference variation, and the calculated rotating speed unequal rate cannot truly reflect the actual load variation speed and amplitude due to the delay problems of power transmitter reaction, inter-station communication and the like. Therefore, according to the characteristics of load response of the coal-fired generator set, the calculation method of the rotating speed unequal rate of the coal-fired generator set is established, and the authenticity and the accuracy of the calculation result of the rotating speed unequal rate are greatly improved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a method for calculating the rotating speed unequal rate of a coal-fired generator set, which can quickly reflect the change of load through main steam flow and simultaneously save the complicated unit conversion and parameter conversion links by adopting per unit value calculation.
The invention adopts the following specific technical scheme:
a method for calculating the rotating speed unequal rate of a coal-fired generator set is characterized by comprising the following steps: the method comprises the following steps:
⑴ quitting AGC control, and putting into coordination, valve control or power control;
⑵ collecting the rotation speed n before disturbance0Main steam flow Q before disturbance0And disturbance preload N0；
⑶ simulation speed n1Recording main steam flow Q after disturbance after the disturbance is stable1And post-disturbance load N1；
⑷, calculating the rotation speed deviation, and per-unit changing the rotation speed deviation;
⑸, calculating a per-unit reference of the main steam flow and calculating a main steam flow change value;
⑹ calculating the per unit change of the main steam flow;
⑺ calculate the rate of speed disparity.
In step ⑷, the rotational speed deviation Δ n is equal to n0-n1The rotational speed deviation change per unit is
Furthermore, the per unit basis of the main steam flow in step ⑸ is
Main steam flow rate variation value delta Q ═ Q1-Q0|。
Furthermore, step ⑹ depicts the change of the main steam flow per unit
In step ⑺, the rotation speed inequality rate is
The invention has the advantages and beneficial effects that:
in the invention, AGC control is quitted at first, and coordination, valve control or power control is put into; then acquiring the rotating speed before disturbance, the main steam flow before disturbance and the load before disturbance; simulating the rotating speed, and recording the main steam flow and the load after disturbance after the disturbance is stable; then calculating the rotation speed deviation, and per-unit changing the rotation speed deviation; then, calculating a per-unit reference of the main steam flow, and calculating a main steam flow change value; then calculating the per unit change of the main steam flow; and finally, calculating the rotating speed unequal rate. The change of the load is reflected by the main steam flow, the aim of rapidness and accuracy is achieved, meanwhile, the tedious links of unit conversion and parameter conversion are omitted by adopting per unit value calculation, and a scientific calculation method is provided for improving the calculation speed and the authenticity of the rotating speed unequal rate.
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 method for calculating the rotating speed unequal rate of a coal-fired generator set, which is characterized by comprising the following steps of: the method comprises the following steps:
⑴ quitting AGC control, and putting into coordination, valve control or power control;
⑵ collecting the rotation speed n before disturbance0Main steam flow Q before disturbance0And disturbanceFront load N0；
⑶ simulation speed n1Recording main steam flow Q after disturbance after the disturbance is stable1And post-disturbance load N1；
⑷, calculating the rotation speed deviation, and per-unit changing the rotation speed deviation;
⑸, calculating a per-unit reference of the main steam flow and calculating a main steam flow change value;
⑹ calculating the per unit change of the main steam flow;
⑺ calculate the rate of speed disparity.
In step ⑷, the rotational speed deviation Δ n is equal to n0-n1The rotational speed deviation change per unit is
Furthermore, the per unit basis of the main steam flow in step ⑸ is
Main steam flow rate variation value delta Q ═ Q1-Q0|。
Furthermore, step ⑹ depicts the change of the main steam flow per unit
In step ⑺, the rotation speed inequality rate is
n0Rated speed, Q, before disturbance0Main steam flow, N, before disturbance0Disturbance preload, n1-simulating the rotational speed, Q1Main steam flow after disturbance, N1Load after disturbance, delta n-rotational speed deviation, delta n' -rotational speed deviation change per unit, Q1eCalculating the principal steam flow per unit reference, delta Q-principal steam flow change value, delta Q' -principal steam flow change per unit, and rotating speed unequal rate.
The test conditions are as follows:
1. after the unit is overhauled, the 90% rated load is stable for at least 24 hours;
2. the primary frequency modulation function design meets the requirements of relevant regulations;
3. the unit exits the AGC control mode;
4. the coordination control system or the DEH power control system is normally put into operation, and the unit is stably controlled;
5. the main control system is normally put into operation;
6. the main parameters of the unit operation, such as main steam temperature, main steam pressure, steam drum water level (intermediate point temperature), hearth negative pressure and the like, are stable in operation and have no alarm or abnormity;
8. the generator set rotating speed and the power grid frequency signal are verified to be qualified, and a related verification certificate is provided;
9. the main parameter data (rotating speed, power, main steam flow, main steam pressure, main steam flow, throttle opening, instruction and the like) of the unit are stored normally, and the sampling period is not less than 1 s.
In the invention, AGC control is quitted at first, and coordination, valve control or power control is put into; then acquiring the rotating speed before disturbance, the main steam flow before disturbance and the load before disturbance; simulating the rotating speed, and recording the main steam flow and the load after disturbance after the disturbance is stable; then calculating the rotation speed deviation, and per-unit changing the rotation speed deviation; then, calculating a per-unit reference of the main steam flow, and calculating a main steam flow change value; then calculating the per unit change of the main steam flow; and finally, calculating the rotating speed unequal rate. The change of the load is reflected by the main steam flow, the aim of rapidness and accuracy is achieved, meanwhile, the tedious links of unit conversion and parameter conversion are omitted by adopting per unit value calculation, and a scientific calculation method is provided for improving the calculation speed and the authenticity of the rotating speed unequal rate.
Claims (5)
1. A method for calculating the rotating speed unequal rate of a coal-fired generator set is characterized by comprising the following steps: the method comprises the following steps:
⑴ quitting AGC control, and putting into coordination, valve control or power control;
⑵ collecting the rotation speed n before disturbance0Main steam flow Q before disturbance0And disturbance preload N0；
⑶ mouldPseudo speed n1Recording main steam flow Q after disturbance after the disturbance is stable1And post-disturbance load N1；
⑷, calculating the rotation speed deviation, and per-unit changing the rotation speed deviation;
⑸, calculating a per-unit reference of the main steam flow and calculating a main steam flow change value;
⑹ calculating the per unit change of the main steam flow;
⑺ calculate the rate of speed disparity.
2. The method for calculating the rotational speed inequality rate of the coal-fired power generating unit according to claim 1, wherein in the step ⑷, the rotational speed deviation is that n is equal to n0-n1The rotational speed deviation change per unit is
3. The method for calculating the rotational speed inequality rate of the coal-fired power generating unit according to claim 1, wherein the per unit basis of the main steam flow in step ⑸ is
Main steam flow rate variation value delta Q ═ Q1-Q0|。
4. The method for calculating the rotational speed inequality rate of the coal-fired power generating unit according to claim 1, wherein the per unit change of the main steam flow rate in step ⑹
5. The method for calculating the unequal rate of the rotating speed of the coal-fired power generating unit according to claim 1, wherein the unequal rate of the rotating speed in the step ⑺ is
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910930912.1A CN111446723A (en) | 2019-09-29 | 2019-09-29 | Method for calculating rotating speed unequal rate of coal-fired generator set |
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| CN201910930912.1A CN111446723A (en) | 2019-09-29 | 2019-09-29 | Method for calculating rotating speed unequal rate of coal-fired generator set |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111654058A (en) * | 2020-05-27 | 2020-09-11 | 国网天津市电力公司电力科学研究院 | Method for calculating rotating speed unequal rate of gas generator set |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN106899027A (en) * | 2017-03-29 | 2017-06-27 | 哈尔滨工业大学 | The Primary frequency control ability compensation method of steam turbine lofty tone valve flow kinematic nonlinearity |
| CN108512232A (en) * | 2018-04-12 | 2018-09-07 | 国网天津市电力公司电力科学研究院 | A kind of computational methods of Thermal generation unit speed diversity factor |
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- 2019-09-29 CN CN201910930912.1A patent/CN111446723A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN106899027A (en) * | 2017-03-29 | 2017-06-27 | 哈尔滨工业大学 | The Primary frequency control ability compensation method of steam turbine lofty tone valve flow kinematic nonlinearity |
| CN108512232A (en) * | 2018-04-12 | 2018-09-07 | 国网天津市电力公司电力科学研究院 | A kind of computational methods of Thermal generation unit speed diversity factor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111654058A (en) * | 2020-05-27 | 2020-09-11 | 国网天津市电力公司电力科学研究院 | Method for calculating rotating speed unequal rate of gas generator set |
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Application publication date: 20200724 |