CN110748388A - Thermal power generating unit load change rate method based on boiler pressure response characteristic - Google Patents
Thermal power generating unit load change rate method based on boiler pressure response characteristic Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
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Abstract
A thermal power generating unit variable load rate method based on boiler pressure response characteristics belongs to the technical field of thermal power generation, and is characterized in that a pressure deviation judgment fixed value and a reference variable load rate are set at first; subtracting the actual value of the main steam pressure from the set value of the main steam pressure to obtain a pressure deviation value; comparing the pressure deviation value with a pressure deviation judgment value, and outputting a variable load control instruction; and (4) carrying out variable load rate correction on the reference variable load rate through a pressure deviation function according to the pressure deviation value, and outputting the final variable load rate. In the unit variable load process, the unit variable load rate is automatically corrected according to the real-time variation condition of the deviation of the set value and the actual value of the main steam pressure of the unit, so that the real coordinated control of the unit and the furnace is realized, and the operation stability of the unit is improved. And outputting a variable load control instruction through the deviation of the set value of the main steam pressure of the unit and the actual value of the main steam pressure, locking the variable load rate of the unit, and preventing the combustion deterioration of the boiler under special working conditions.
Description
Technical Field
The invention belongs to the technical field of thermal power generation, and particularly relates to a thermal power generating unit load change rate method based on boiler pressure response characteristics.
Background
In recent years, with the increase of the power supply ratio of new energy resources such as wind power and photovoltaic power Generation in a power grid and the stricter examination of two rules of power plant grid-connection management and auxiliary service compensation from the power grid, the load instruction of automatic power Generation control AGC (automatic Generation control) of a thermal power generating set frequently and rapidly changes, the thermal load change characteristic of a boiler has large inertia and large delay lag behind the load change of the set, and the load change rate of the set is set as a fixed value. The variable load rate of the original unit is not automatically corrected in combination with the characteristics of a boiler, so that the fluctuation of the main steam pressure of the unit is large, two items of detail examination is serious, the follow fluctuation of each system of coal, water, wind and the like of the unit is large, and even the safe and stable operation of the unit is seriously influenced.
Disclosure of Invention
The invention aims to solve the problems and provides a variable load rate method of the thermal power generating unit based on the boiler pressure response characteristic, which can automatically correct the variable load rate of the unit according to the real-time response condition of the boiler pressure, realize the coordination control of the boiler, give full play to the characteristic advantages of the boiler after ensuring that the unit meets the basic variable load rate requirement of a power grid and improve the coordination capability of a grid source of the unit.
The invention discloses a thermal power generating unit load change rate method based on boiler pressure response characteristics, which comprises the following steps of:
the method comprises the following steps: firstly, setting a pressure deviation judgment fixed value and a reference variable load rate; the reference variable load rate is set by an operator according to two detailed rule assessment standards of the power grid;
step two: subtracting the actual value of the main steam pressure from the set value of the main steam pressure to obtain a pressure deviation value; the larger the deviation value is, the boiler load response lags the unit variable load rate requirement and is slowed down through correction, and the smaller the deviation value is or a negative value appears, the boiler load response leads the unit variable load rate requirement and is accelerated through correction;
step three: comparing the pressure deviation value with a pressure deviation judgment value, and outputting a variable load control instruction;
step four: and (4) carrying out variable load rate correction on the reference variable load rate through a pressure deviation function according to the pressure deviation value, and outputting the final variable load rate.
Preferably, in the method for changing the load rate of the thermal power generating unit based on the boiler pressure response characteristic, the pressure deviation determination value comprises an increasing load constant value and a decreasing load constant value.
Preferably, in the method for changing the load rate of the thermal power generating unit based on the boiler pressure response characteristic, the step three of comparing the pressure deviation value with the pressure deviation determination value and outputting the load change control command includes:
when the pressure deviation value is greater than the load-lifting fixed value, the load-lifting speed is switched to 0, and the load lifting of the unit is locked;
and when the pressure deviation value is smaller than the load reduction fixed value, the load reduction rate is switched to 0, and the locking unit reduces the load.
Preferably, in the method for changing the load rate of the thermal power generating unit based on the boiler pressure response characteristic, in the step four, the reference load rate is subjected to the load rate change correction through the pressure deviation function, the automatic correction is realized through multiplying the reference load rate by the pressure deviation function, and the final load rate is output.
When the unit is in a load-increasing working condition, the reference variable load rate is automatically corrected by multiplying the pressure deviation function by the reference variable load rate according to the deviation change condition of the main steam pressure set value and the main steam pressure actual value, the larger the main steam pressure set value minus the main steam pressure actual value is, the larger the boiler load response delay unit variable load rate requirement is, therefore, the variable load rate is slowed down through correction, the smaller the set value minus the actual value is, the boiler load response can meet the unit variable load rate requirement, and therefore, the variable load rate is faster through correction.
When the unit is in a load reduction working condition, the reference variable load rate is automatically corrected by multiplying the pressure deviation function by the reference variable load rate according to the deviation change condition of the main steam pressure set value and the main steam pressure actual value, the larger the main steam pressure set value minus the main steam pressure actual value is, the boiler load response can meet the unit variable load rate requirement, so the variable load rate is accelerated through correction, the smaller the set value minus the actual value is, the boiler load response lags the unit variable load rate requirement, and the variable load rate is slowed down through correction.
Preferably, according to the method for changing the load rate of the thermal power generating unit based on the boiler pressure response characteristic, the pressure deviation function comprises an ascending load pressure deviation function and a descending load pressure deviation function.
According to the thermal power generating unit variable load rate method based on the boiler pressure response characteristic, the thermal power generating unit variable load rate is automatically corrected according to the real-time change condition of the deviation of the set value and the actual value of the main steam pressure of the thermal power generating unit in the unit variable load process, so that the real coordinated control of the thermal power generating unit is realized, and the operation stability of the thermal power generating unit is improved. And outputting a variable load control instruction through the deviation of the set value of the main steam pressure of the unit and the actual value of the main steam pressure, locking the variable load rate of the unit, and preventing the combustion deterioration of the boiler under special working conditions.
Drawings
FIG. 1 is a block diagram of a variable load rate forming loop of the unit of the present invention;
wherein T1: switching to pressure deviation f for load reduction of the unit1(x) A loop for automatically correcting, operating and setting a reference variable load rate value; t2: switching to pressure deviation f during unit load increase2(x) A loop for automatically correcting, operating and setting a reference variable load rate value; t3: pressure deviation for load reduction of units<b, locking a load reduction loop; t4: pressure deviation for unit load-up>a, locking a load-lifting loop; f. of1(x) Automatically correcting a function for pressure deviation when the load is reduced; f. of2(x) Automatically correcting a function for the pressure deviation at the time of load increase; b is a pressure deviation locking load reduction fixed value when the load is reduced; and a is the pressure deviation locking load-lifting constant value at the load-lifting time.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings and the embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention discloses a thermal power generating unit load change rate method based on boiler pressure response characteristics, which comprises the following steps as shown in figure 1:
the method comprises the following steps: firstly, setting a pressure deviation judgment fixed value and a reference variable load rate; the reference variable load rate is set by an operator according to two detailed rule assessment standards of the power grid; the pressure deviation determination value includes an up-load constant value a and a down-load constant value b.
Step two: subtracting the actual value of the main steam pressure from the set value of the main steam pressure to obtain a pressure deviation value; the larger the deviation value is, the boiler load response lags the unit variable load rate requirement and is slowed down through correction, and the smaller the deviation value is or a negative value appears, the boiler load response leads the unit variable load rate requirement and is accelerated through correction;
step three: comparing the pressure deviation value with a pressure deviation judgment value, and outputting a variable load control instruction; when the pressure deviation value is greater than the load-lifting fixed value, the load-lifting speed is switched to 0, and the load lifting of the unit is locked; and when the pressure deviation value is smaller than the load reduction fixed value, the load reduction rate is switched to 0, and the locking unit reduces the load.
Step four: and carrying out variable load rate correction on the reference variable load rate through a pressure deviation function according to the pressure deviation value, realizing automatic correction by multiplying the reference variable load rate by the pressure deviation function, and outputting the final variable load rate. The pressure deviation function comprises a boost pressure deviation function f2(x) And decreasing load pressure deviation function f1(x)。
When the unit is in a load-increasing working condition, the reference variable load rate is automatically corrected by multiplying the pressure deviation function by the reference variable load rate according to the deviation change condition of the main steam pressure set value and the main steam pressure actual value, the larger the main steam pressure set value minus the main steam pressure actual value is, the larger the boiler load response delay unit variable load rate requirement is, therefore, the variable load rate is slowed down through correction, the smaller the set value minus the actual value is, the boiler load response can meet the unit variable load rate requirement, and therefore, the variable load rate is faster through correction.
When the unit is in a load reduction working condition, the reference variable load rate is automatically corrected by multiplying the pressure deviation function by the reference variable load rate according to the deviation change condition of the main steam pressure set value and the main steam pressure actual value, the larger the main steam pressure set value minus the main steam pressure actual value is, the boiler load response can meet the unit variable load rate requirement, so the variable load rate is accelerated through correction, the smaller the set value minus the actual value is, the boiler load response lags the unit variable load rate requirement, and the variable load rate is slowed down through correction.
In the embodiment, the operator sets 1.5% of the rated load of the unit reference variable load rate according to two fine rule assessment standards of the power grid; the load-up constant value a is 1.5MPa, and the load-down constant value b is-1.5 MPa.
And when the load rises, automatically correcting the load rising rate according to the deviation change condition of the main steam pressure set value and the actual value, wherein the load changing rate is slower when the set value is larger than the actual value, and the load changing rate is faster when the set value is smaller than the actual value. Function f of automatic correction at load increase1(x) As in the following table:
| deviation of pressure | -1.2 | -1 | -0.5 | -0.3 | 0 | 0.3 | 0.6 | 1 | 1.2 |
| Correction factor | 1.5 | 1.3 | 1.2 | 1.1 | 1 | 1 | 0.8 | 0.6 | 0.5 |
And when the load is reduced, automatically correcting the load reduction rate according to the deviation change condition of the main steam pressure set value and the actual value, wherein the load change rate is faster when the set value is reduced by the actual value, and the load change rate is slower when the set value is reduced by the actual value. Automatic correction function f in case of load reduction2(x) As in the following table:
| deviation of pressure | -1.2 | -1 | -0.5 | -0.3 | 0 | 0.3 | 0.6 | 1 | 1.2 |
| Correction factor | 0.5 | 0.6 | 0.8 | 1 | 1 | 1.1 | 1.2 | 1.3 | 1.5 |
And (3) when the load is increased, if the actual value subtracted from the set value of the main steam pressure is greater than a fixed value a, the load increasing speed is cut to 0, and the load increasing of the unit is locked. And (3) when the load is reduced, if the actual value subtracted from the set value of the main steam pressure is smaller than the fixed value b, the load reduction rate is switched to 0, and the unit is locked to reduce the load. In the unit variable load process, the unit variable load rate is automatically corrected according to the real-time variation condition of the deviation of the set value and the actual value of the main steam pressure of the unit, so that the real coordinated control of the unit and the furnace is realized, and the operation stability of the unit is improved.
Claims (5)
1. A thermal power generating unit load change rate method based on boiler pressure response characteristics is characterized by comprising the following steps:
the method comprises the following steps: firstly, setting a pressure deviation judgment fixed value and a reference variable load rate;
step two: subtracting the actual value of the main steam pressure from the set value of the main steam pressure to obtain a pressure deviation value;
step three: comparing the pressure deviation value with a pressure deviation judgment value, and outputting a variable load control instruction;
step four: and (4) carrying out variable load rate correction on the reference variable load rate through a pressure deviation function according to the pressure deviation value, and outputting the final variable load rate.
2. The thermal power generating unit load change rate method based on the boiler pressure response characteristic as claimed in claim 1, wherein: step one the pressure deviation determination value includes an up load constant value and a down load constant value.
3. The thermal power generating unit load change rate method based on the boiler pressure response characteristic as claimed in claim 2, wherein: step three, the process of comparing the pressure deviation value with the pressure deviation judging value and outputting the variable load control command comprises the following steps:
when the pressure deviation value is greater than the load-lifting fixed value, the load-lifting speed is switched to 0, and the load lifting of the unit is locked;
and when the pressure deviation value is smaller than the load reduction fixed value, the load reduction rate is switched to 0, and the locking unit reduces the load.
4. The thermal power generating unit load change rate method based on the boiler pressure response characteristic as claimed in claim 3, wherein: and step four, the reference variable load rate is subjected to variable load rate correction through a pressure deviation function, namely, the reference variable load rate is multiplied by the pressure deviation function to realize automatic correction, and the final variable load rate is output.
5. The thermal power generating unit load change rate method based on the boiler pressure response characteristic as claimed in claim 4, wherein: the pressure deviation function includes an up load pressure deviation function and a down load pressure deviation function.
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Cited By (6)
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| CN111308886A (en) * | 2020-04-07 | 2020-06-19 | 兰州陇能电力科技有限公司 | Coal-fired unit coordination control method and system |
| CN111520700A (en) * | 2020-04-03 | 2020-08-11 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Differential calculation method based on real-time correction of boiler main steam pressure regulation deviation |
| CN111564871A (en) * | 2020-05-13 | 2020-08-21 | 国电新能源技术研究院有限公司 | Self-adaptive variable load instruction generation method and device based on thermal inertia of coal-fired power station |
| CN112947609A (en) * | 2021-01-27 | 2021-06-11 | 山东中实易通集团有限公司 | Main steam pressure setting control strategy and system for sliding pressure operation unit |
| CN113110631A (en) * | 2021-03-29 | 2021-07-13 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Main steam pressure control method for thermal power plant |
| CN113189862A (en) * | 2021-04-29 | 2021-07-30 | 中国大唐集团科学技术研究院有限公司中南电力试验研究院 | Quality evaluation method for PID control loop of thermal power plant |
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| CN113110631A (en) * | 2021-03-29 | 2021-07-13 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Main steam pressure control method for thermal power plant |
| CN113110631B (en) * | 2021-03-29 | 2023-10-24 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Main steam pressure control method for thermal power plant |
| CN113189862A (en) * | 2021-04-29 | 2021-07-30 | 中国大唐集团科学技术研究院有限公司中南电力试验研究院 | Quality evaluation method for PID control loop of thermal power plant |
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