CN112628710B - Automatic control method for main steam temperature of gas-steam combined cycle unit - Google Patents
Automatic control method for main steam temperature of gas-steam combined cycle unit Download PDFInfo
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- CN112628710B CN112628710B CN202011636959.6A CN202011636959A CN112628710B CN 112628710 B CN112628710 B CN 112628710B CN 202011636959 A CN202011636959 A CN 202011636959A CN 112628710 B CN112628710 B CN 112628710B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G5/00—Controlling superheat temperature
- F22G5/12—Controlling superheat temperature by attemperating the superheated steam, e.g. by injected water sprays
- F22G5/123—Water injection apparatus
Abstract
The invention provides a main steam temperature automatic control method of a gas-steam combined cycle unit, which is characterized by comprising a first-stage PID operation step and a second-stage PID operation step, wherein in the first-stage PID operation step, a unit load feedback value is substituted into a preset first linear function to operate to obtain a set value of the outlet temperature of a high-pressure superheater, and the set value and the high-pressure superheater outlet temperature feedback value are subjected to first-stage PID operation to obtain a first temperature set value; substituting the position feedback value of the main control valve into a preset second linear function, and calculating to obtain a second temperature set value; the main steam temperature is used as the regulated quantity of the first stage PID, and the output of the main steam temperature is used as the set value of the second stage PID to control the temperature after the desuperheater. The rear superheat degree of the desuperheater is calculated in real time, the upper limit of the input of the desuperheater is guaranteed, the input amount of the desuperheater can be rapidly adjusted under the condition that the rear superheat degree requirement of the desuperheater is met, and therefore the purpose of controlling the temperature of main steam is achieved.
Description
Technical Field
The invention relates to a main steam temperature automatic control method of a gas-steam combined cycle unit.
Background
The main steam temperature is influenced by the supply side (i.e. unit load-turbine exhaust to exhaust-heat boiler heating steam) and the regulated side, i.e. the input of desuperheating water. Wherein, the load of the unit changes, and the temperature of the main steam does not change immediately. After a period of time lag, the load change of the unit has corresponding influence on the temperature of the main steam, and the temperature of the main steam can change rapidly; the input amount of the desuperheating water has relatively slow influence on the temperature of the main steam, but has instantaneous influence on the temperature after the desuperheater, namely, the change of the input amount of the desuperheating water influences the temperature after the desuperheater, but the temperature of the main steam cannot change instantaneously.
The traditional main steam temperature control logic is a control principle of performing single PID control on the main steam temperature, namely increasing the desuperheating water when the temperature exceeds a set value and reducing the desuperheating water when the temperature is lower than the set value. The control principle has the following defects: firstly, the working condition change of the gas-steam combined cycle unit is not adjusted timely, and the adjustment disturbance is easy to occur; secondly, the steam temperature change of the waste heat boiler of the gas-steam combined cycle unit lags behind the load change, and a feedforward signal is difficult to design; thirdly, main steam needs to meet the superheat degree, when the temperature of the main steam rises rapidly, the superheat degree of the desuperheater is insufficient due to the fact that the desuperheater is excessively thrown in, the protection action is quit of the desuperheater, and the risk of water impact exists.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention provides an automatic control method for the main steam temperature of a gas-steam combined cycle unit, which comprises the following specific technical contents:
a main steam temperature automatic control method of a gas-steam combined cycle unit comprises the following steps:
s1, a first stage PID operation step, which includes:
s11, substituting the unit load feedback value into a preset first linear function, calculating to obtain a set value of the high-pressure superheater outlet temperature, and performing first-stage PID calculation on the set value and the high-pressure superheater outlet temperature feedback value to obtain a first temperature set value of the high-pressure desuperheater;
s12, substituting the position feedback value of the main control valve into a preset second linear function, and calculating to obtain a second temperature set value of the high-pressure desuperheater;
s13, outputting the main control valve position feedback value to the S end of a first RS trigger after passing through a first judgment module, and outputting the high-pressure superheater outlet temperature feedback value to the R end of a second RS trigger after passing through a second judgment module; the first judging module is used for judging whether the position feedback value of the main control valve is smaller than a preset value, namely outputting '1' when the position feedback value of the main control valve is smaller than the preset value, and otherwise outputting '0'; the second judgment module is used for judging whether the outlet temperature feedback value of the high-pressure superheater is larger than or smaller than a preset value, namely outputting '1' when the outlet temperature feedback value of the high-pressure superheater is larger than an upper limit value or smaller than a lower limit value, and otherwise outputting '0';
s14, when the first RS trigger is set to 0, outputting a first temperature set value as the output of the first stage PID operation step; otherwise, outputting a second temperature set value as a first-stage PID operation step;
s2, a second stage PID operation step, which comprises:
s21, carrying out second-stage PID operation on the high-pressure superheater outlet temperature feedback value and the output value of the first-stage PID operation step to obtain a temperature reduction adjustment opening value;
s22, the outlet temperature feedback value of the high-pressure superheater is output to the input end of the AND gate module after passing through the third judgment module, the exhaust temperature feedback value of the gas turbine is output to the input end of the AND gate module after passing through the fourth judgment module, and the position feedback value of the main control valve is output to the input end of the AND gate module after passing through the fifth judgment module; the output of the AND gate module is connected to the S end of the second RS trigger, and the position feedback value of the main control valve is connected to the R end of the second RS trigger after passing through the sixth judgment module; the third judgment module is used for judging whether the feedback value of the outlet temperature of the high-pressure superheater is larger than a preset judgment value, namely outputting '1' when the feedback value of the outlet temperature of the high-pressure superheater is larger than the preset judgment value, and otherwise outputting '0'; the fourth judgment module is used for judging whether the exhaust temperature feedback value of the gas turbine is larger than a preset value, namely outputting '1' when the exhaust temperature feedback value of the gas turbine is larger than the preset judgment value, and otherwise outputting '0'; the fifth judging module is used for judging whether the position feedback value of the main control valve is larger than a preset value, namely outputting '1' when the position feedback value of the main control valve is larger than the preset value, and otherwise outputting '0'; the sixth judging module is used for judging whether the position feedback value of the main control valve is smaller than a preset value, namely outputting '1' when the position feedback value of the main control valve is smaller than the preset value, and otherwise outputting '0';
s23, when the second RS trigger is set to be 1, outputting a temperature-reducing adjustment opening value for controlling the opening of the high-pressure temperature-reducing water adjustment door; otherwise, output of a constant value is performed.
In one or more embodiments of the present invention, the temperature-decreasing adjustment opening value is outputted according to a set speed change rate.
In one or more embodiments of the present invention, the upper output limit of the first stage PID operation is 405, and the lower output limit is 209.
In one or more embodiments of the present invention, the output upper limit of the second stage PID operation is 50, and the output lower limit is 0.
In one or more embodiments of the present invention, the predetermined judgment value of the first judgment module is 15, the upper limit value of the second judgment module is 545, and the lower limit value of the second judgment module is 530.
In one or more embodiments of the present invention, the default value determined by the third determining module is 510, the default value determined by the fourth determining module is 1080, the default value determined by the fifth determining module is 8, and the default value determined by the sixth determining module is 3.
The beneficial effects of the invention are: the main steam temperature control effect is good under various working conditions, the main steam temperature is controlled within a set value range while the superheat degree behind the desuperheater is met, the problem of the superheat degree of the main steam is avoided, the starting success rate is high, the hot starting time of the gas-steam combined cycle unit is effectively shortened, the whole process of the main steam temperature control is automatically controlled, manual intervention operation is not needed, the automation degree of the unit is improved, and the manual operation risk is reduced.
Drawings
FIG. 1 is a control flow chart of the present invention.
Detailed Description
The scheme of the present application is further described below with reference to fig. 1:
a main steam temperature automatic control method of a gas-steam combined cycle unit comprises the following steps:
s1, a first stage PID operation step, which includes:
s11, substituting the unit load feedback value into a preset first linear function, calculating to obtain a set value of the high-pressure superheater outlet temperature, and performing first-stage PID calculation on the set value and the high-pressure superheater outlet temperature feedback value to obtain a first temperature set value of the high-pressure desuperheater;
s12, substituting the position feedback value of the main control valve into a preset second linear function, and calculating to obtain a second temperature set value of the high-pressure desuperheater;
s13, outputting the main control valve position feedback value to the S end of a first RS trigger after passing through a first judgment module, and outputting the high-pressure superheater outlet temperature feedback value to the R end of a second RS trigger after passing through a second judgment module; the first judging module is used for judging whether the position feedback value of the main control valve is smaller than a preset value, namely outputting '1' when the position feedback value of the main control valve is smaller than the preset value, and otherwise outputting '0'; the second judgment module is used for judging whether the outlet temperature feedback value of the high-pressure superheater is larger than or smaller than a preset value, namely outputting '1' when the outlet temperature feedback value of the high-pressure superheater is larger than an upper limit value or smaller than a lower limit value, and otherwise outputting '0';
s14, when the first RS trigger is set to 0, outputting a first temperature set value as the output of the first stage PID operation step; otherwise, outputting a second temperature set value as a first-stage PID operation step;
s2, a second stage PID operation step, which comprises:
s21, carrying out second-stage PID operation on the high-pressure superheater outlet temperature feedback value and the output value of the first-stage PID operation step to obtain a temperature reduction adjustment opening value;
s22, the outlet temperature feedback value of the high-pressure superheater is output to the input end of the AND gate module after passing through the third judgment module, the exhaust temperature feedback value of the gas turbine is output to the input end of the AND gate module after passing through the fourth judgment module, and the position feedback value of the main control valve is output to the input end of the AND gate module after passing through the fifth judgment module; the output of the AND gate module is connected to the S end of the second RS trigger, and the position feedback value of the main control valve is connected to the R end of the second RS trigger after passing through the sixth judgment module; the third judgment module is used for judging whether the feedback value of the outlet temperature of the high-pressure superheater is larger than a preset judgment value, namely outputting '1' when the feedback value of the outlet temperature of the high-pressure superheater is larger than the preset judgment value, and otherwise outputting '0'; the fourth judgment module is used for judging whether the exhaust temperature feedback value of the gas turbine is larger than a preset judgment value, namely, outputting '1' when the exhaust temperature feedback value of the gas turbine is larger than the preset judgment value, and otherwise, outputting '0'; the fifth judging module is used for judging whether the position feedback value of the main control valve is larger than a preset value, namely outputting '1' when the position feedback value of the main control valve is larger than the preset value, and otherwise outputting '0'; the sixth judging module is used for judging whether the position feedback value of the main control valve is smaller than a preset value, namely outputting '1' when the position feedback value of the main control valve is smaller than the preset value, and otherwise outputting '0';
s23, when the second RS trigger is set to be 1, outputting a temperature-reducing adjustment opening degree value for controlling the opening degree of the high-pressure temperature-reducing water adjustment door; otherwise, outputting a constant value is performed.
Preferably, the desuperheating adjustment opening degree value is output according to a set speed change rate, the output upper limit of the first stage PID operation is 405, the output lower limit thereof is 209, the output upper limit of the second stage PID operation is 50, the output lower limit thereof is 0, the judgment preset value of the first judgment module is 15, the upper limit thereof is 545, and the lower limit thereof is 530. The preset judgment value of the third judgment module is 510, the preset judgment value of the fourth judgment module is 1080, the preset judgment value of the fifth judgment module is 8, and the preset judgment value of the sixth judgment module is 3.
General legends in fig. 1:
the difficulty in solving the technical problem is as follows:
if the main steam temperature is taken as a single regulated quantity, the main steam temperature rises due to load change, and the superheat degree of the desuperheater is insufficient due to short-time excessive input of desuperheater water;
if the post-desuperheater temperature is taken as a single regulated quantity, the post-desuperheater temperature meets the requirement and the main steam temperature is out of the set value range because the post-desuperheater temperature and the main steam temperature do not have a corresponding relation.
Therefore, the invention adopts the control idea of double PID, namely, the temperature of the main steam is used as the regulated quantity of the first stage PID, the set value is given by the corresponding function of the unit load, and the output of the set value is used as the set value of the second stage PID to control the temperature after the desuperheater. And the upper limit of the input of the desuperheating water is ensured by calculating the superheat degree behind the desuperheater in real time. The first stage PID strengthens integral action, namely responds to the accumulated change of the temperature of the main steam of the regulated quantity, delays and adjusts transient change, and the second stage PID strengthens differential action, namely rapidly adjusts the temperature change after the desuperheater. Namely, the input amount of the desuperheater can be rapidly adjusted under the condition of meeting the requirement of the post-superheat degree of the desuperheater, so that the aim of controlling the temperature of the main steam is fulfilled. Meanwhile, according to the change condition of the temperature of the main steam, the change of the heat storage condition is reflected through time accumulation, and the rear temperature set value of the desuperheater is dynamically adjusted, so that the input amount of the desuperheating water is adjusted, and the adjustment disturbance caused by short-time fluctuation of the load is avoided.
For example: when the unit is started to load less than 250MW, the control mode is as follows:
when the temperature of the main steam is less than 530 ℃ or more than 545 ℃ and the opening of the main steam valve is less than 15%, single-impulse control is adopted, namely the function output between the opening and the temperature of the main steam valve is used as the PID set value of the post-temperature of the desuperheater, and then the high-pressure superheated steam desuperheating water regulating valve is controlled.
When the main steam temperature is more than 530 ℃ and less than 545 ℃, three-impulse control is adopted, namely the main controller controls the main steam temperature according to the set value of the load function, the PID output value determines the range to be 303-minus 405 according to data analysis, the output value is the set value of the auxiliary controller and controls the opening of the main steam temperature-reducing water regulating valve according to the PID output value of the main steam temperature-reducing water, and the output value range is set to be 0-50% according to the starting data experience.
The control mode when the unit is started to load more than 250MW is as follows: the control mode of fixing the temperature set value of the main steam and outputting the temperature set value after the desuperheater by PID is adopted.
The above preferred embodiments should be considered as examples of the embodiments of the present application, and technical deductions, substitutions, improvements and the like similar to, similar to or based on the embodiments of the present application should be considered as the protection scope of the present patent.
Claims (6)
1. A main steam temperature automatic control method of a gas-steam combined cycle unit is characterized by comprising the following steps:
s1, a first stage PID operation step, which includes:
s11, substituting the unit load feedback value into a preset first linear function, calculating to obtain a set value of the high-pressure superheater outlet temperature, and performing first-stage PID calculation on the set value and the high-pressure superheater outlet temperature feedback value to obtain a first temperature set value of the high-pressure desuperheater;
s12, substituting the position feedback value of the main control valve into a preset second linear function, and calculating to obtain a second temperature set value of the high-pressure desuperheater;
s13, outputting the main control valve position feedback value to the S end of a first RS trigger after passing through a first judgment module, and outputting the high-pressure superheater outlet temperature feedback value to the R end of a second RS trigger after passing through a second judgment module; the first judging module is used for judging whether the position feedback value of the main control valve is smaller than a preset value, namely outputting '1' when the position feedback value of the main control valve is smaller than the preset value, and otherwise outputting '0'; the second judgment module is used for judging whether the outlet temperature feedback value of the high-pressure superheater is larger than or smaller than a preset value, namely outputting '1' when the outlet temperature feedback value of the high-pressure superheater is larger than an upper limit value or smaller than a lower limit value, and otherwise outputting '0';
s14, when the first RS trigger is set to 0, outputting a first temperature set value as the output of the first stage PID operation step; otherwise, outputting a second temperature set value as a first-stage PID operation step;
s2, a second stage PID operation step, which comprises:
s21, carrying out second-stage PID operation on the high-pressure superheater outlet temperature feedback value and the output value of the first-stage PID operation step to obtain a temperature reduction adjustment opening value;
s22, the outlet temperature feedback value of the high-pressure superheater is output to the input end of the AND gate module after passing through the third judgment module, the exhaust temperature feedback value of the gas turbine is output to the input end of the AND gate module after passing through the fourth judgment module, and the position feedback value of the main control valve is output to the input end of the AND gate module after passing through the fifth judgment module; the output of the AND gate module is connected to the S end of the second RS trigger, and the position feedback value of the main control valve is connected to the R end of the second RS trigger after passing through the sixth judgment module; the third judgment module is used for judging whether the feedback value of the outlet temperature of the high-pressure superheater is larger than a preset judgment value, namely outputting '1' when the feedback value of the outlet temperature of the high-pressure superheater is larger than the preset judgment value, and otherwise outputting '0'; the fourth judgment module is used for judging whether the exhaust temperature feedback value of the gas turbine is larger than a preset value, namely outputting '1' when the exhaust temperature feedback value of the gas turbine is larger than the preset judgment value, and otherwise outputting '0'; the fifth judging module is used for judging whether the position feedback value of the main control valve is larger than a preset value, namely outputting '1' when the position feedback value of the main control valve is larger than the preset value, and otherwise outputting '0'; the sixth judging module is used for judging whether the position feedback value of the main control valve is smaller than a preset value, namely outputting '1' when the position feedback value of the main control valve is smaller than the preset value, and otherwise outputting '0';
s23, when the second RS trigger is set to be 1, outputting a temperature-reducing adjustment opening degree value for controlling the opening degree of the high-pressure temperature-reducing water adjustment door; otherwise, output of a constant value is performed.
2. The automatic control method for the main steam temperature of the gas-steam combined cycle unit as claimed in claim 1, characterized in that: and the temperature-reducing adjustment opening value is output according to a set speed change rate.
3. The automatic control method for the main steam temperature of the gas-steam combined cycle unit as claimed in claim 1, is characterized in that: the upper output limit of the first stage PID operation is 405, and the lower output limit is 209.
4. The automatic control method for the main steam temperature of the gas-steam combined cycle unit as claimed in claim 1, is characterized in that: the output upper limit of the second-stage PID operation is 50, and the output lower limit is 0.
5. The automatic control method for the main steam temperature of the gas-steam combined cycle unit as claimed in claim 1, is characterized in that: the preset judgment value of the first judgment module is 15, the upper limit value of the second judgment module is 545, and the lower limit value of the second judgment module is 530.
6. The automatic control method for the main steam temperature of the gas-steam combined cycle unit as claimed in claim 5, characterized in that: the preset judgment value of the third judgment module is 510, the preset judgment value of the fourth judgment module is 1080, the preset judgment value of the fifth judgment module is 8, and the preset judgment value of the sixth judgment module is 3.
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