CN111520700A - Differential calculation method based on real-time correction of boiler main steam pressure regulation deviation - Google Patents
Differential calculation method based on real-time correction of boiler main steam pressure regulation deviation Download PDFInfo
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Abstract
The invention discloses a differential calculation method based on real-time correction of boiler main steam pressure regulating deviation, which comprises the steps of obtaining theoretical differential calculated quantity of the boiler main steam pressure regulating deviation; according to the main steam pressure regulating deviation and the change direction thereof, the differential regulating amplitude of the theoretical differential calculated quantity is corrected to obtain amplitude limiting differential regulating quantity; according to the positive and negative values of the amplitude limiting differential regulating variable and the regulating deviation of the main steam pressure of the boiler, the differential regulating attenuation rate of the amplitude limiting differential regulating variable is corrected to obtain a speed limiting differential regulating variable; then, the high limit and low limit limiting functions are added to the differential output value, and finally the actual differential output value is obtained. The differential calculation method based on the boiler main steam pressure regulation deviation real-time correction comprehensively judges the real-time automatic correction differential regulation action quantity according to the system regulation deviation size, the change direction and the change rate, improves the adaptability of the differential regulation action, really achieves advanced control, and finally improves the dynamic regulation performance of the system.
Description
Technical Field
The invention belongs to the technical field of automatic control of thermal power generation, and particularly relates to a differential calculation method for real-time correction of adjustment deviation based on main steam pressure of a boiler.
Background
In the actual thermal power automatic control technology engineering, the most widely applied regulator control rules are proportion P, integral I and differential D, which are called PID control for short. The differential regulation reflects the change rate of the system deviation signal, and the trend of deviation change can be predicted, so that an advanced control action can be generated, the dynamic performance of the system can be improved, and the differential regulation action of the system with large delay and large inertia in the power generation system is necessary. However, in practical application, the differential regulation is only calculated according to the variation rate of the deviation, the action amplitude and the attenuation time of the differential regulation do not consider the current regulation deviation at all, so that the practical application effect is poor, and even the differential regulation action of a part of regions influences the system safety.
Disclosure of Invention
The invention aims to provide a differential calculation method for correcting the adjustment deviation of the main steam pressure of a boiler in real time, which improves the adaptability of differential adjustment and the dynamic adjustment performance of a system.
The technical scheme adopted by the invention is as follows: the differential calculation method based on the real-time correction of the main steam pressure regulation deviation of the boiler comprises the following steps:
step 1: obtaining theoretical differential calculated quantity D of boiler main steam pressure regulating deviation delta0；
Step 2: according to the main steam pressure of boiler regulating deviation delta and its change direction, the theoretical differential calculated quantity D0The amplitude of the differential adjustment is corrected to obtain amplitude limiting differential adjustment quantity D1；
And step 3: adjusting quantity D according to amplitude limiting differential1The positive value and the negative value of the amplitude limiting differential regulation quantity D and the main steam pressure regulation deviation delta of the boiler1The differential adjustment attenuation rate is corrected to obtain a speed-limiting differential adjustment quantity D2；
And 4, step 4: differential adjustment of speed limit D2And increasing the high limit and low limit limiting functions to finally obtain the actual differential output quantity D.
The present invention is also characterized in that,
theoretical differential calculated quantity obtained in step 1
Wherein: Δ is the set value SP minus the actual value PV, k is the differential adjustment gain, T is the differential adjustment time, and s is the laplacian operator.
The step 2 specifically comprises the following steps:
when the main steam pressure regulating deviation delta of the boiler is smaller than the set regulating deviation negative alarm value delta L and the main steam pressure regulating deviation delta of the boiler shows a gradually increasing trend, the theoretical differential calculated quantity D is calculated0Multiplying by a modified differential regulation amplitude function f1(Δ), function f1(Delta) is determined according to the main steam pressure regulating deviation Delta of the boiler, and the smaller the main steam pressure regulating deviation Delta of the boiler is, the function f is output1The smaller (Δ);
when the main steam pressure regulating deviation delta of the boiler is greater than the set regulating deviation forward alarm value delta H and the main steam pressure regulating deviation delta of the boiler shows a gradually decreasing trend, the theoretical differential calculated quantity D is calculated at the moment0Multiplying by a modified differential regulation amplitude function f2(Δ), function f2(Delta) is determined according to the main steam pressure regulating deviation Delta of the boiler, and the larger the main steam pressure regulating deviation Delta of the boiler is, the larger the output function f2The smaller (Δ);
when the main steam pressure regulating deviation delta of the boiler is between the negative regulating deviation alarm value delta L and the positive regulating deviation alarm value delta H, no system correction is carried out, and normal regulation is maintained.
The step 3 specifically comprises the following steps:
when limiting the differential adjustment quantity D1Less than-0.1, and the obtained speed-limiting differential regulating quantity D2Not more than-0.01, and amplitude limiting differential adjustment quantity D1Switching the rate of rise at decay to a modified differential regulation decay rate function f3(Δ), function f3(delta) is determined according to the main steam pressure regulation deviation delta of the boiler, and the main steam pressure regulation deviation of the boilerThe larger the difference Δ, the function f3(Δ) the slower the output corresponds to the ramp rate;
when limiting the differential adjustment quantity D1Greater than 0.1, and the obtained speed-limiting differential regulating quantity D2Not less than 0.01, amplitude limiting differential adjustment quantity D1Switching the rate of decay to a modified differential regulation decay rate function f4(Δ), function f4(Delta) is determined according to the main steam pressure regulating deviation Delta of the boiler, and the smaller the main steam pressure regulating deviation Delta of the boiler is, the function f4(Δ) the slower the output corresponds to the rate of decrease;
when limiting the differential adjustment quantity D1Between-0.1 and 0.1, both the ramp-up rate and the ramp-down rate are switched to 1, i.e. no decay rate limitation is performed.
Function f1(Δ)、f2(Δ)、f3(Delta) and f4The value range of (delta) is 0 to 1.
The invention has the beneficial effects that: the differential calculation method based on the boiler main steam pressure regulation deviation real-time correction comprehensively judges the real-time automatic correction differential regulation action quantity according to the system regulation deviation size, the change direction and the change rate, improves the adaptability of the differential regulation action, really achieves advanced control, and finally improves the dynamic regulation performance of the system.
Drawings
FIG. 1 is a logic block diagram of a differential calculation method of the present invention based on real-time correction of boiler main steam pressure regulation deviation.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention provides a differential calculation method based on real-time correction of boiler main steam pressure regulation deviation, as shown in figure 1, comprising the following steps:
1. theoretical differential calculation loop
Differential calculation is carried out according to the deviation delta between the set value and the actual value of the main steam pressure of the boiler of the thermal generator set, and the calculation formula is as follows:
wherein: d0Calculating an output for the theoretical differential; delta is the system regulation deviation, generally the set value SP minus the actual value PV; k is a differential adjustment gain; t is differential adjustment time; s is the laplace operator.
2. Differential regulation amplitude correction loop
The amplitude limiting differential regulation quantity D is obtained by comprehensively judging the size of the deviation delta of the main steam pressure of the boiler and the change direction of the deviation delta and correcting the differential regulation amplitude according to the deviation delta1. Mainly comprises the following loops:
1) when the main steam pressure regulating deviation delta of the boiler is smaller than the deviation regulating negative alarm value delta L manually set by the regulating system and the deviation delta shows a gradually increasing trend, the theoretical differential calculating loop is multiplied by a correction function f1(Δ) thereby automatically correcting the theoretical differential calculation amount. Function f1(Delta) is determined from the input deviation Delta, the smaller the deviation Delta, the larger the deviation of the actual value from the set value, and the smaller the deviation Delta, the smaller the output coefficient, and is determined by the function f1The (delta) correction attenuates its differential counter-regulation effect. Example f1(Δ) the following table:
f1(Δ)＝k1Δ+b1wherein: f. of1(Delta) is the deviation △ corresponding to the modified differential modulation amplitude function1Is the slope; b1Is an offset; k is a radical of1、b1Obtained according to the regulation characteristics of different systems and the real-time deviation delta in a comprehensive way, and finally satisfies f1The (Δ) correction factor is between 0 and 1.
2) When the main steam pressure regulating deviation delta of the boiler is larger than the deviation regulating positive alarm value delta H artificially set by the regulating system and the deviation delta shows a gradually decreasing trend, the main steam pressure regulating deviation delta is multiplied by a correction function f in a theoretical differential calculation loop2(Δ) thereby automatically correcting the theoretical differential calculation amount. Function f2(Delta) is determined from the input deviation Delta, the larger the deviation Delta the larger the deviation of the actual value from the set value, the larger the deviation Delta the smaller the output coefficient, and the function f2(Delta) correction to reverseThe effect on regulation is reduced. Example f2(Δ) the following table:
f2(Δ)＝k2Δ+b2wherein: f. of2(Delta) is the deviation △ corresponding to the modified differential modulation amplitude function2Is the slope; b2Is an offset; k is a radical of2、b2Obtained according to the regulation characteristics of different systems and the real-time deviation delta in a comprehensive way, and finally satisfies f2The (Δ) correction factor is between 0 and 1.
3) When the main steam pressure regulating deviation delta of the boiler is between the negative alarm value delta L and the positive alarm value delta H, the system correction coefficient is 1.0, the system correction is not carried out, and the normal regulation is maintained.
3. Differential attenuation rate correction loop
Correcting the differential regulation attenuation rate according to the current pressure deviation delta of the main steam pressure regulation system of the thermal power generating unit boiler to obtain the speed-limiting differential regulation quantity D2. Mainly comprises the following loops:
1) amplitude limiting differential adjustment quantity D after amplitude correction1Less than-0.1, and the differential regulating quantity D of speed limit after speed limit2Less than or equal to-0.01, and the raising rate of the differential speed limiting function block is switched to the corresponding function f of the main steam pressure regulation deviation delta of the boiler3(Delta). Function f3(Delta) is determined from the deviation Delta, the larger the deviation Delta indicates that the actual pressure value deviates from the set value, and the larger the deviation Delta is, the function f3The slower the (delta) output rise rate, the slower its differential regulation decay rate is corrected for. Example f3(Δ) the following table:
f3(Δ)＝k3Δ+b3wherein: f. of3(Delta) is a function of the corrected differential modulation decay rate for the deviation △3Is the slope; b3Is an offset; k is a radical of3、b3According to different systemsThe regulation characteristic and the real-time deviation delta are obtained comprehensively and finally satisfy f3The (delta) rise rate is between 0 and 1.
2) Amplitude limiting differential adjustment quantity D after amplitude correction1Greater than 0.1, and the differential regulating quantity D of speed limit after speed limit2When the differential speed limiting function block reduces the speed and switches to the corresponding function f of the main steam pressure regulation deviation delta of the boiler when the differential speed limiting function block reduces the speed and is greater than or equal to 0.014(Delta). Function f4(Delta) is determined from the deviation Delta, the smaller the deviation Delta, the larger the deviation of the actual value from the set value, and the smaller the deviation Delta, the function f4The (delta) output is corrected to reduce the rate of decay of its differential regulation, the slower the corresponding rate of decay. Example f4(Δ) the following table:
f4(Δ)＝k4Δ+b4wherein: f. of4(Delta) is a function of the corrected differential modulation decay rate for the deviation △4Is the slope; b4Is an offset; k is a radical of4、b4Obtained according to the regulation characteristics of different systems and the real-time deviation delta in a comprehensive way, and finally satisfies f4The (Δ) rate of decrease is between 0 and 1.
3) Amplitude limiting differential adjustment quantity D after amplitude correction1When the speed is more than or equal to-0.1 and less than or equal to 0.1, the rising rate and the falling rate are both cut to 1, namely, the speed is not limited.
4. Differential clipping
Differential adjustment of speed limit D2And the amplitude limiting functions of the upper limit H and the lower limit L are added to finally obtain the actual differential output quantity D, so that the influence of overlarge differential action amplitude on the system safety is prevented.
Through the mode, the technical scheme of the invention has the characteristics that:
(1) in the process of automatically adjusting the main steam pressure of the thermal power generation boiler, the differential adjustment amplitude is automatically corrected according to the magnitude and the variation trend of the real-time pressure deviation delta of the adjusting system, so that the accurate control of the adjustment process in a subarea mode is achieved.
(2) In the process of automatically adjusting the main steam pressure of the thermal power generation boiler, the differential adjustment attenuation rate is automatically corrected according to the current pressure deviation delta of the adjusting system, and the adaptability of the differential adjustment action is improved.
The invention relates to a differential calculation method based on real-time correction of boiler main steam pressure regulation deviation, which corrects the amplitude and the attenuation rate of a differential regulation action in real time according to the current deviation delta of a boiler main steam pressure regulation system, improves the adaptability of the differential regulation action, really achieves advanced control and finally improves the dynamic regulation performance of the system.
Claims (5)
1. The differential calculation method for real-time correction of the adjustment deviation based on the main steam pressure of the boiler is characterized by comprising the following steps of:
step 1: obtaining theoretical differential calculated quantity D of boiler main steam pressure regulating deviation delta0；
Step 2: according to the main steam pressure of boiler regulating deviation delta and its change direction, the theoretical differential calculated quantity D0The amplitude of the differential adjustment is corrected to obtain amplitude limiting differential adjustment quantity D1；
And step 3: adjusting quantity D according to amplitude limiting differential1The positive value and the negative value of the amplitude limiting differential regulation quantity D and the main steam pressure regulation deviation delta of the boiler1The differential adjustment attenuation rate is corrected to obtain a speed-limiting differential adjustment quantity D2；
And 4, step 4: differential adjustment of speed limit D2And increasing the high limit and low limit limiting functions to finally obtain the actual differential output quantity D.
2. The differential calculation method for real-time correction of main steam pressure regulation deviation based on boiler as claimed in claim 1, wherein the theoretical differential calculated quantity obtained in step 1
Wherein: Δ is the set value SP minus the actual value PV, k is the differential adjustment gain, T is the differential adjustment time, and s is the laplacian operator.
3. The differential calculation method for real-time correction of boiler main steam pressure regulation deviation according to claim 2, wherein the step 2 specifically comprises:
when the main steam pressure regulating deviation delta of the boiler is smaller than the set regulating deviation negative alarm value delta L and the main steam pressure regulating deviation delta of the boiler shows a gradually increasing trend, the theoretical differential calculated quantity D is calculated0Multiplying by a modified differential regulation amplitude function f1(Δ), function f1(Delta) is determined according to the main steam pressure regulating deviation Delta of the boiler, and the smaller the main steam pressure regulating deviation Delta of the boiler is, the function f is output1The smaller (Δ);
when the main steam pressure regulating deviation delta of the boiler is greater than the set regulating deviation forward alarm value delta H and the main steam pressure regulating deviation delta of the boiler shows a gradually decreasing trend, the theoretical differential calculated quantity D is calculated at the moment0Multiplying by a modified differential regulation amplitude function f2(Δ), function f2(Delta) is determined according to the main steam pressure regulating deviation Delta of the boiler, and the larger the main steam pressure regulating deviation Delta of the boiler is, the larger the output function f2The smaller (Δ);
when the main steam pressure regulating deviation delta of the boiler is between the negative regulating deviation alarm value delta L and the positive regulating deviation alarm value delta H, no system correction is carried out, and normal regulation is maintained.
4. The differential calculation method for real-time correction of regulation deviation based on boiler main steam pressure as claimed in claim 3, wherein said step 3 specifically comprises:
when limiting the differential adjustment quantity D1Less than-0.1, and the obtained speed-limiting differential regulating quantity D2Not more than-0.01, and amplitude limiting differential adjustment quantity D1Switching the rate of rise at decay to a modified differential regulation decay rate function f3(Δ), function f3(Delta) is determined from the main steam pressure regulation deviation Delta of the boiler, the function f being the larger the main steam pressure regulation deviation Delta of the boiler is3(Δ) the slower the output corresponds to the ramp rate;
when limiting the differential adjustment quantity D1Greater than 0.1, and the obtained speed-limiting differential regulating quantity D2Not less than 0.01, amplitude limiting differential modulationSaving D1Switching the rate of decay to a modified differential regulation decay rate function f4(Δ), function f4(Delta) is determined according to the main steam pressure regulating deviation Delta of the boiler, and the smaller the main steam pressure regulating deviation Delta of the boiler is, the function f4(Δ) the slower the output corresponds to the rate of decrease;
when limiting the differential adjustment quantity D1Between-0.1 and 0.1, both the ramp-up rate and the ramp-down rate are switched to 1, i.e. no decay rate limitation is performed.
5. Differential calculation method for the real-time correction of the regulation deviation based on the main steam pressure of a boiler according to claim 4, characterized in that said function f1(Δ)、f2(Δ)、f3(Delta) and f4The value range of (delta) is 0 to 1.
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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 |
| CN113985825A (en) * | 2021-10-20 | 2022-01-28 | 大唐湘潭发电有限责任公司 | Method for optimizing SCR denitration system based on DCS |
| CN118838464A (en) * | 2024-06-21 | 2024-10-25 | 深圳市硅科力科技有限公司 | Power supply controller output voltage control method and device based on high-precision ADC and negative feedback closed loop, computing equipment and computer program product |
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| CN118838464A (en) * | 2024-06-21 | 2024-10-25 | 深圳市硅科力科技有限公司 | Power supply controller output voltage control method and device based on high-precision ADC and negative feedback closed loop, computing equipment and computer program product |
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