CN114527659A - Active mode identification control method and system for thermal power generating unit - Google Patents
Active mode identification control method and system for thermal power generating unit Download PDFInfo
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Abstract
The invention provides a method and a system for identifying and controlling an active mode of a thermal power generating unit, wherein the method comprises the following steps: identifying the automatic generating control operation mode of the unit according to the received automatic generating control instruction and the speed-limiting after-load instruction without primary frequency modulation to obtain an identification result of the machine operation mode; if the identification result is in the R mode, counting the small variable load times of the unit to obtain a counting result; and correcting the unit control parameters according to the counting result. The real-time matching of the unit control parameters and the actual working condition is ensured, the adjusting quality of a unit control system is effectively improved, the network-related supporting capacity of the unit is improved, the continuous small-amplitude variable load times are analyzed, the feedforward vacancy caused by the excessively short variable load duration is made up, the problem that the main steam pressure is seriously undervoltage in the later period due to the weakening of the feedforward quantity after the continuous small-amplitude variable load occurs when the unit is in the R mode is avoided, the unit performance is improved, and the unit operation safety is ensured.
Description
Technical Field
The invention relates to the technical field of generator set control, in particular to an active mode identification control method and system for a thermal power generating unit.
Background
Automatic Generation Control (AGC) is one of important grid-related performances of a thermal power generating unit, the unit receives a grid-regulation Automatic Generation Control command to change load, in an actual operation process, an Automatic Generation Control mode is divided into an O mode and an R mode, and the change amplitude and the change frequency of the Automatic Generation Control command in different modes are different. When the unit has a variable load requirement, the feedforward quantity needs to be adjusted so as to improve the load adaptability of the unit and keep the stability of main parameters as much as possible.
In the prior art, most thermal power generating units adopt a mode of combining proportional-integral-derivative control and feedforward to carry out unit coordination control, control parameters are determined only through a large-amplitude variable load test, and an automatic power generation control mode is not identified. When the automatic power generation control is in the R mode, the change frequency of the load instruction of the unit is high, the change amplitude is small, the coordination control parameters are not matched with the actual operation working condition, the main steam pressure under-pressure at the later stage of variable load is easy to cause serious, and the operation safety of the unit is threatened.
In addition, in the prior art, the coordination control of the unit is only limited to the adjustment of the feedforward quantity, and the synchronous dynamic adjustment of a control system is lacked, so that the operation safety of the unit is ensured, and the automatic power generation control performance and the networking support capacity of the unit are improved.
Disclosure of Invention
Aiming at the problems in the prior art, the embodiment of the invention provides a thermal power generating unit active mode identification control method and system, which can at least partially solve the problems in the prior art.
On one hand, the invention provides an active mode identification control method for a thermal power generating unit, which comprises the following steps: identifying the automatic generating control operation mode of the unit according to the received automatic generating control instruction and the speed-limiting after-load instruction without primary frequency modulation to obtain an identification result of the automatic generating control operation mode of the unit;
if the identification result is in the R mode, counting the small variable load times of the unit to obtain a counting result;
and correcting the main control feed-forward quantity and/or the unit control parameters of the unit according to the counting result.
Further, according to the automatic power generation control instruction, identifying an automatic power generation control operation mode of the unit comprises: calculating the absolute value of the difference value of each automatic power generation control instruction power value and the speed-limiting after-load instruction power value without primary frequency modulation to obtain an absolute value result corresponding to each automatic power generation control instruction;
and if the accumulated quantity of the absolute value results corresponding to the automatic power generation control instructions which are more than or equal to the first overshoot value and less than the second overshoot value is larger than a preset value, identifying that the unit operation mode is an R mode.
Further, the counting the number of times of small variable load of the unit and obtaining a counting result includes:
if the operation mode of the unit is judged and known to be the R mode, and the absolute value result corresponding to the automatic power generation control command is larger than or equal to the first overshoot value and smaller than the second overshoot value, counting the small variable load of the unit once;
and counting the total times of small-amplitude variable loads of the unit in a preset time period as the counting result.
Further, the correcting the main control feed-forward quantity of the unit according to the counting result comprises: acquiring a main control feed-forward quantity correction coefficient of the unit according to the speed-limited after-load instruction power value without primary frequency modulation, and acquiring a small-amplitude load accumulated change number dynamic correction coefficient according to the counting result;
and obtaining the corrected main control feed-forward quantity of the unit according to the main control feed-forward quantity correction coefficient of the unit, the small-amplitude load accumulated change frequency dynamic correction coefficient and a first preset formula.
Further, the first preset formula is as follows:
ΔP＝ΔP0×CM×CRT
wherein, the delta P is the corrected main control feed-forward quantity of the unit, and the delta P0For the main control feed-forward quantity of the unit before correction, CMCorrection coefficient for main control feed forward quantity of unit, CRTAnd dynamically correcting the coefficient for the accumulated change times of the small-amplitude load.
Further, the modifying the unit control parameter according to the counting result includes: acquiring a set initial control parameter according to the speed-limited after-load instruction power value without primary frequency modulation, and acquiring a small-amplitude load accumulated change number dynamic correction coefficient according to the counting result;
and obtaining the corrected unit control parameter according to the unit initial control parameter, the small amplitude load accumulated change frequency dynamic correction coefficient and a second preset formula.
Further, the second preset formula is as follows:
A＝A0×CRT
wherein A is the corrected unit control parameter, A0As initial control parameters of the unit, CRTAnd dynamically correcting the coefficient for the accumulated change times of the small-amplitude load.
On the other hand, the invention provides an active mode identification control system of a thermal power absorption unit, which comprises the following components:
the mode identification module is used for identifying the automatic power generation control operation mode of the unit according to the received automatic power generation control instruction and the speed-limiting after-load instruction without primary frequency modulation to obtain an identification result of the automatic power generation control operation mode of the unit;
the small-amplitude variable load counting module is used for counting the small-amplitude variable load times of the unit to obtain a counting result if the identification result is in an R mode;
and the correction module is used for correcting the main control feed-forward quantity and/or the unit control parameters of the unit according to the counting result.
Further, the pattern recognition module comprises:
the numerical value calculation unit is used for calculating the absolute value of the difference value of each automatic power generation control instruction power value and the speed-limiting after-load instruction power value without primary frequency modulation, and obtaining the absolute value result corresponding to each automatic power generation control instruction;
and the numerical value judging unit is used for judging that the accumulated quantity of absolute value results corresponding to the automatic power generation control command which is more than or equal to the first overshoot value and less than the second overshoot value is more than a preset value, and identifying that the unit operation mode is an R mode.
Further, the small amplitude variable load counting module comprises:
the small variable load identification unit is used for judging and obtaining that the absolute value result corresponding to the automatic power generation control command is greater than or equal to a first overshoot value and smaller than a second overshoot value when the unit operation mode is an R mode, and counting the small variable load of the unit once;
and the counting unit is used for counting the total times of small-amplitude variable loads of the unit in a preset time period as the counting result.
Further, the correction module comprises:
the first parameter acquisition unit is used for acquiring a main control feed-forward quantity correction coefficient of the unit according to the speed-limiting after-load instruction power value without primary frequency modulation; obtaining a dynamic correction coefficient of the accumulated change times of the small-amplitude load according to the counting result;
and the first correction unit is used for obtaining the corrected main control feed-forward quantity of the unit according to the main control feed-forward quantity correction coefficient of the unit, the dynamic correction coefficient of the accumulative change times of the small-amplitude load and a first preset formula.
Further, the first preset formula is as follows:
ΔP＝ΔP0×CM×CRT
wherein, the delta P is the corrected main control feed-forward quantity of the unit, and the delta P0For the main control feed-forward quantity of the unit before correction, CMCorrection coefficient for main control feed forward quantity of unit, CRTAnd dynamically correcting the coefficient for the accumulated change times of the small-amplitude load.
Further, the correction module further includes:
the second parameter acquisition unit is used for acquiring the initial control parameters of the unit according to the speed-limiting afterload instruction power value without primary frequency modulation; obtaining a dynamic correction coefficient of the accumulated change times of the small-amplitude load according to the counting result;
and the second correction unit is used for obtaining the corrected unit control parameters according to the unit initial control parameters, the small-amplitude load accumulated change frequency dynamic correction coefficient and a second preset formula.
Further, the second preset formula is as follows:
A＝A0×CRT
wherein A is the corrected unit control parameter, A0As initial control parameters of the unit, CRTAnd dynamically correcting the coefficient for the accumulated change times of the small-amplitude load.
In another aspect, the present invention provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor executes the computer program to implement the steps of the method for active mode identification control of a thermal power generating unit according to any one of the embodiments described above.
In still another aspect, the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the steps of the method for active mode identification control of a thermal power generating unit according to any one of the above embodiments.
The method and the system for the active mode identification control of the thermal power generating unit provided by the embodiment of the invention comprise the following steps: identifying the automatic generating control operation mode of the unit according to the received automatic generating control instruction and the speed-limiting after-load instruction without primary frequency modulation to obtain an identification result of the automatic generating control operation mode of the unit; if the identification result is in the R mode, counting the small variable load times of the unit to obtain a counting result; and correcting the main control feed-forward quantity and/or the unit control parameters of the unit according to the counting result. The automatic generation control operation mode of the unit is identified and the accumulated small variable load times are analyzed, so that the main control feed-forward quantity and/or the control parameters of the unit are corrected, the control parameters of the unit are matched with the actual working condition in real time, adverse effects on the safety and the performance of the unit due to parameter mismatching are avoided, the adjustment quality of a unit control system is effectively improved, the networking supporting capacity of the unit is improved, the accumulated small variable load times are analyzed, the shortage caused by too short duration of variable load can be compensated, the problem that the main steam pressure in the later period is seriously undervoltage due to the weakening of the feed-forward quantity after the accumulated small variable load occurs when the unit is in the R mode is avoided, the performance of the unit is improved, and the operation safety of the unit is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts. In the drawings:
fig. 1 is a schematic flow chart of a thermal power generating unit active mode identification control method according to an embodiment of the present invention.
Fig. 2 is a schematic flow chart illustrating the process of identifying the operation mode of the automatic power generation control of the unit according to an embodiment of the present invention.
Fig. 3 is a schematic flow chart illustrating the process of counting the number of times of small variable loads of the unit according to an embodiment of the present invention.
Fig. 4 is a schematic flow chart illustrating a process of correcting a unit master feed forward quantity according to an embodiment of the present invention.
Fig. 5 is a schematic flow chart illustrating a process of correcting a unit control parameter according to an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of an active mode identification control system of a thermal power generating unit according to an embodiment of the present invention.
Fig. 7 is a schematic physical structure diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The execution main body of the thermal power generating unit active mode identification control method provided by the embodiment of the invention comprises but is not limited to a computer and an industrial personal computer.
Fig. 1 is a schematic flow chart of a thermal power generating unit active mode identification control method according to an embodiment of the present invention, and as shown in fig. 1, the thermal power generating unit active mode identification control method according to the embodiment of the present invention includes:
s101: identifying the automatic generating control operation mode of the unit according to the received automatic generating control instruction and the speed-limiting after-load instruction without primary frequency modulation to obtain an identification result of the automatic generating control operation mode of the unit;
in the step, the automatic power generation control operation mode of the unit is judged according to the power value of the received automatic power generation control instruction and the power value of the speed-limiting afterload instruction without primary frequency modulation.
Specifically, the automatic power generation Control instruction refers to a load power instruction output by a Coordinated Control System (CCS) of the power plant unit according to a calculation result of automatic power generation Control software in an Energy Management System (EMS) of a dispatching center, so as to adjust the output of the power generating unit.
Specifically, the load instruction after speed limiting without primary frequency modulation is a load power instruction after the generator set performs instruction change rate speed limiting processing on the automatic power generation control instruction.
Specifically, the automatic power generation control operation mode of the generator set is judged according to the power value of the received automatic power generation control instruction and the power value of the speed-limited after-load instruction without primary frequency modulation, and the automatic power generation control operation mode of the generator set comprises an automatic power generation control load tracking mode (SCHEO, O mode) and an automatic power generation control normal mode (PROPR, R mode). The R mode requires the highest investment standard, the highest compensation and the highest response requirement on the unit load.
For example, when the unit is subjected to variable load in the R mode, the boiler main control feedforward is far smaller than the normal loaded amplitude, if the unit is continuously subjected to small-amplitude variable load at the moment, the steam pressure of the unit is under-voltage due to continuous shortage of the boiler main control feedforward quantity, so that the unit running performance can be improved and the unit running safety can be ensured by identifying whether the unit automatic power generation control running mode is in the R mode or not and correcting the unit coordination control parameters and the feedforward quantity aiming at the condition that the unit is in the R mode.
S102: if the identification result is in the R mode, counting the small variable load times of the unit to obtain a counting result;
in the step, the times of small variable load of the generator set in the R mode are counted, and a counting result is obtained.
Specifically, after the unit is judged to be in the R mode to operate, the times of small variable load of the generator set in a preset time period are counted, and the feedforward shortage can be caused due to the fact that the duration time of the small variable load is too short, and the problem of main steam pressure under-pressure can be caused by the feedforward shortage. Therefore, the times of small variable loads of the unit within a preset time period need to be counted for adjusting the control parameters and the feedforward quantity of the unit.
S103: and correcting the main control feed-forward quantity and/or the unit control parameters of the unit according to the counting result.
In the step, the main control feed forward quantity and/or the unit control parameters of the unit are corrected according to the counting result of the small variable load times of the unit in the preset time period in the S102.
Specifically, according to the counting result of the times of the small-amplitude variable load of the unit in the preset time period in the step S102, the main control feed-forward quantity of the unit is dynamically corrected to make up for the feed-forward shortage of the unit caused by the too short duration of the small-amplitude variable load. The unit master control feed-forward quantity comprises but is not limited to dynamic feed-forward such as load differential feed-forward, pressure deviation differential feed-forward and the like.
Specifically, unit control parameters are corrected, and the unit control parameters include but are not limited to a feedwater control parameter, an intermediate point temperature control parameter, and the like. Through revising unit control parameter, can ensure control parameter and operating condition phase-match, improve the control quality to compensate the main steam engine pressure under-pressure problem that the control system regulating variable shortage that the small-amplitude becomes load variation undersize leads to, improve unit performance, ensure unit operation safety.
For example, the main control feed-forward quantity of the generator set can be dynamically corrected according to the counting result of the times of small amplitude variable load of the generator set in the preset time period in the step S102, so that the feed-forward shortage of the generator set caused by too short duration of the small amplitude variable load can be made up.
For example, the unit control parameters may be individually corrected according to the counting result of the number of small load changes occurring in the unit within the preset time period in S102, where the unit control parameters include: control parameters such as water supply control and intermediate point temperature control, thereby ensuring that the control parameters are matched with the operation condition, improving the control quality, making up for the problem of main engine pressure under-pressure caused by the shortage of the regulating quantity of a control system due to the small amplitude variable load variation, improving the unit performance and ensuring the unit operation safety.
For example, the main control feed-forward quantity and the control parameters of the unit can be synchronously and dynamically adjusted according to the counting result of the small variable load times of the unit in the preset time period in the step S102, so that the operation safety of the unit is ensured, the automatic power generation control performance of the unit is improved, and the networking support capability of the unit is improved.
The active mode identification control method for the thermal power generating unit provided by the embodiment of the invention is used for correcting the main control feed-forward quantity and/or the unit control parameters of the unit by identifying the automatic generation control operation mode of the unit and analyzing the accumulated small variable load times, so that the real-time matching of the unit control parameters and the actual working condition is ensured, the adverse effects on the safety and the performance of the unit caused by the unmatched parameters are avoided, the adjustment quality of a unit control system is effectively improved, the networking supporting capability of the unit is improved, the accumulated small variable load times are analyzed, the feed-forward shortage caused by the excessively short duration time of the variable load can be compensated, the problem that the main steam pressure is seriously undervoltage in the later period due to the weakening of the feed-forward quantity after the small variable load occurs when the unit is in the R mode is avoided, the performance of the unit is improved, and the operation safety of the unit is ensured.
Fig. 2 is a schematic flow chart illustrating the process of identifying the automatic power generation control operation mode of the unit according to an embodiment of the present invention, as shown in fig. 2, based on the foregoing embodiments, further identifying the automatic power generation control operation mode of the unit according to the received automatic power generation control command and the speed-limited after-load command without primary frequency modulation includes:
s201: calculating the absolute value of the difference value of each automatic power generation control instruction power value and the speed-limiting afterload instruction power value without primary frequency modulation to obtain an absolute value result corresponding to each automatic power generation control instruction;
in the step, the power value of each automatic power generation control instruction is differed from the power value of the speed-limited afterload instruction without primary frequency modulation, and the absolute value of the difference is taken to obtain the absolute value result corresponding to each automatic power generation control instruction.
Specifically, when the automatic power generation control instruction is a load reduction instruction, the difference value between the power value of the automatic power generation control instruction and the power value of the load instruction without primary frequency modulation after speed limitation is a negative value, and the absolute value of the difference value is taken as the absolute value result corresponding to the automatic power generation control instruction.
Specifically, when the automatic power generation control command is a load increase command, the difference between the power value of the automatic power generation control command and the power value of the speed-limited post-load command without primary frequency modulation is a positive value, and the difference is directly used as an absolute value result corresponding to the automatic power generation control command.
S202: and if the accumulated quantity of the absolute value results corresponding to the automatic power generation control instructions which are more than or equal to the first overshoot value and less than the second overshoot value is larger than a preset value, identifying that the unit operation mode is an R mode.
In this step, the absolute value result corresponding to the automatic power generation control instruction in S201 is compared with the first overshoot value and the second overshoot value, and when the absolute value result corresponding to the automatic power generation control instruction is greater than or equal to the first overshoot value and less than the second overshoot value, and the number of times of cumulative occurrence is greater than a preset value, the unit operation mode is identified as the R mode. The first overshoot value and the second overshoot value are set according to actual needs, and the embodiment of the invention is not limited.
Specifically, the first overshoot value is a small overshoot value, and according to the test specification for acceptance of the analog quantity control system of the thermal power plant (DL-T657-2006), the first overshoot value is 1% of the rated power of the generator set, and when the load variation rate of the generator set is smaller than the first overshoot value, namely smaller than 1%, the load variation of the generator set is within a given deviation, the system stability index is met, and the generator set is considered to be in a stable state.
Specifically, the second overshoot value is a large overshoot value, 6% of the rated power of the unit is taken, and when the load fluctuation rate of the generator set is greater than the second overshoot value, that is, greater than 6%, the unit is considered to have large load fluctuation.
Specifically, when the absolute value result corresponding to the automatic power generation control command is larger than a second overshoot value, identifying that the unit operation mode is an O mode; and when the absolute value result corresponding to the automatic power generation control command is greater than or equal to a first overshoot value and smaller than a second overshoot value and the accumulated occurrence frequency is greater than a preset value, identifying that the unit operation mode is an R mode. The preset value is larger than 1, so that the situation that the identification result of the generator set is frequently switched between an O mode and an R mode, the operation parameters of the generator set are frequently corrected, and the system load is increased is avoided. And the preset value cannot be too large, and the R mode of the generator set is difficult to identify by using the too large preset value, so that the parameter correction matched with the working condition of the generator set cannot be performed.
For example, the preset value is 3 times, and if the accumulated number of absolute value results corresponding to the automatic power generation control command which is greater than or equal to the first overshoot value and smaller than the second overshoot value is judged and obtained to be greater than three times, the unit operation mode is identified to be the R mode.
Fig. 3 is a schematic flow chart of counting the number of times of small variable load of the unit according to an embodiment of the present invention, as shown in fig. 3, on the basis of the foregoing embodiments, further, the counting the number of times of small variable load of the unit to obtain a counting result includes:
s301: if the unit operation mode is judged to be the R mode, the absolute value result corresponding to the automatic power generation control command is acquired to be larger than or equal to a first overshoot value and smaller than a second overshoot value, and the unit is counted once in a small-amplitude variable load mode;
in the step, when the unit is identified to be in the R mode, the absolute value result corresponding to the automatic power generation control command which is greater than or equal to the first overshoot value and smaller than the second overshoot value is counted.
Specifically, when the unit is identified to be in the R mode, when the absolute value result corresponding to the automatic power generation control command is greater than or equal to the first overshoot value and smaller than the second overshoot value, for example, greater than or equal to 1% of rated power of the generator set and smaller than 6% of rated power of the generator set, it is determined that the automatic power generation control command is a small variable load command, and at this time, the small variable load of the unit is counted once.
S302: and counting the total times of small-amplitude variable loads of the unit in a preset time period as the counting result.
In the step, the total times of small-amplitude variable load of the unit in a preset time period are counted. The preset time period is set according to actual needs, and the embodiment of the invention is not limited.
Specifically, the preset time is set according to the actual operation condition of the generator set, and when a shorter preset time is set, the generator set is subjected to pattern recognition and small-amplitude variable load counting at shorter intervals, so that the generator set can be subjected to accurate parameter correction, and the operation parameters of the generator set are matched with the actual operation condition; when a longer preset time is set, the generator set is subjected to pattern recognition and small-amplitude variable load counting at longer intervals, so that large parameters of the generator set are corrected, and the calculation pressure of the processor is lower at the moment.
For example, the preset time is 300s, when the unit is identified to be in the R mode, the preset time starts to be calculated, the small variable load frequency in 300s is counted as the statistical result, and if the small variable load frequency recorded in 300s is 0 and the automatic power generation control instruction of which the absolute value result is greater than or equal to the second overshoot value does not appear, the calculation is restarted for 300 s; if the small variable load times recorded in 300S are 0 and the automatic power generation control instruction with the absolute value result greater than or equal to the second overshoot value appears, finishing the statistics of the total small variable load times of the unit in a preset time period, returning to the step S101, and restarting the identification of the unit operation mode.
Fig. 4 is a schematic flow chart of correcting a unit main control feed-forward quantity according to an embodiment of the present invention, and as shown in fig. 4, on the basis of the foregoing embodiments, further correcting the unit main control feed-forward quantity according to the counting result includes:
s401: acquiring a main control feed-forward quantity correction coefficient of the unit according to the speed-limited after-load instruction power value without primary frequency modulation, and acquiring a small-amplitude load accumulated change number dynamic correction coefficient according to the counting result;
in the step, a corresponding unit main control feed forward quantity correction coefficient is obtained according to the speed-limited after-load instruction power value without primary frequency modulation, and a small-amplitude load accumulated change time dynamic correction coefficient is obtained according to a small-amplitude load change time statistical result in the preset time period.
Specifically, the corresponding relation between the speed-limited after-load instruction power value without primary frequency modulation and the main control feed-forward quantity correction coefficient of the generator set and the corresponding relation between the small-amplitude variable load frequency statistical result and the small-amplitude load accumulated change frequency dynamic correction coefficient in the preset time period are obtained through a generator set debugging test.
S402: and obtaining the corrected main control feed-forward quantity of the unit according to the main control feed-forward quantity correction coefficient of the unit, the small-amplitude load accumulated change frequency dynamic correction coefficient and a first preset formula.
In the step, the corrected main control feed-forward quantity of the unit and the dynamic correction coefficient of the small-amplitude load accumulated change times are substituted into a first preset formula to calculate the corrected main control feed-forward quantity of the unit, and the corrected main control feed-forward quantity of the unit is obtained.
Specifically, the corrected main control feed-forward quantity of the unit is obtained by calculating according to a first preset formula through the correction coefficient of the main control feed-forward quantity of the unit and the dynamic correction coefficient of the accumulated change times of the small-amplitude load, which are obtained in the step S401.
On the basis of the foregoing embodiments, further, the first preset formula is:
ΔP＝ΔP0×CM×CRT
wherein, the delta P is the corrected main control feed-forward quantity of the unit, and the delta P0The method is a set master feedforward quantity before correction, wherein the set master feedforward quantity comprises dynamic feedforward such as load differential feedforward, pressure deviation differential feedforward and the like, CMCorrection coefficient for main control feed forward quantity of unit, CRTDynamically correcting coefficient for small amplitude load accumulated change times, and when the unit is identified to be in O mode, CRTIs 1.
For example, taking the differential feedforward correction of the load as an example, the corresponding relationship between the differential feedforward correction coefficient of the load and the load command power value after the speed limit without primary modulation is shown in table 1:
TABLE 1 corresponding relationship table of load differential feedforward correction coefficient and speed-limiting after-load instruction power value without primary frequency modulation
| D0(MW) | 40％Pe | 50％Pe | 60％Pe | 70％Pe | 80％Pe | 90％Pe | 100％Pe |
| Cm | 0.95 | 0.98 | 1 | 1.02 | 1.05 | 1.02 | 1 |
Wherein D is0The power value of the speed-limited afterload instruction without primary frequency modulation is Pe the rated power of the generator set, CmIs a load differential feedforward correction coefficient.
The corresponding relationship between the dynamic correction coefficient of the cumulative change times of the small-amplitude load and the statistical result of the times of the small-amplitude load within the preset time period is shown in table 2:
TABLE 2 corresponding relation table of small-amplitude load cumulative change times dynamic correction coefficient and small-amplitude variable load times statistical result
| RT | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| CRT | 1 | 1.02 | 1.05 | 1.08 | 1.12 | 1.16 | 1.2 |
Wherein R isTThe statistical result of the small variable load times in the preset time period is obtained,CRTand dynamically correcting the coefficient for the accumulated change times of the amplitude load.
And correcting the load differential feedforward according to a first preset formula.
Δp＝Δp0×Cm×CRT
Where Δ p is the modified differential feed forward of the load, Δ p0For differential feed-forward of the load before correction, CmFor load differential feedforward correction coefficients, CRTDynamically correcting coefficient for small amplitude load accumulated change times, and when the unit is identified to be in O mode, CRTIs 1
Fig. 5 is a schematic flow chart of correcting a unit control parameter according to an embodiment of the present invention, and as shown in fig. 5, on the basis of the foregoing embodiments, further correcting the unit control parameter according to the counting result includes:
s501: acquiring a set initial control parameter according to the speed-limited after-load instruction power value without primary frequency modulation, and acquiring a small-amplitude load accumulated change number dynamic correction coefficient according to the counting result;
in the step, the corresponding unit initial control parameter is obtained according to the speed-limited after-load instruction power value without primary frequency modulation, and the small-amplitude load accumulated change time dynamic correction coefficient is obtained according to the small-amplitude load change time statistical result in the preset time period.
Specifically, the corresponding relation between the speed-limited post-load instruction power value without primary frequency modulation and the set initial control parameter and the corresponding relation between the small-amplitude variable load frequency statistical result and the small-amplitude load accumulated change frequency dynamic correction coefficient in the preset time period are obtained through a set debugging test.
S502: and obtaining the corrected unit control parameter according to the unit initial control parameter, the small amplitude load accumulated change frequency dynamic correction coefficient and a second preset formula.
In the step, the initial control parameter of the unit and the dynamic correction coefficient of the small-amplitude load accumulated change times are substituted into a second preset formula to calculate the corrected unit control parameter, and the corrected unit control parameter is obtained.
Specifically, the corrected unit control parameter is obtained by calculating according to a second preset formula through the unit initial control parameter and the small amplitude load accumulated change number dynamic correction coefficient obtained in S401.
On the basis of the foregoing embodiments, further, the second preset formula is:
A＝A0×CRT
wherein A is the corrected unit control parameter, A0Is the initial control parameter of the unit, including but not limited to the control parameters of water supply control, intermediate point temperature control, etc., CRTDynamically correcting coefficient for small amplitude load accumulated change times, and when the unit is identified to be in O mode, CRTIs 1.
For example, taking the example of correcting the intermediate point temperature proportionality coefficient, the corresponding relationship between the initial value of the intermediate point temperature proportionality coefficient and the speed-limiting afterload instruction power value without primary frequency modulation is shown in table 3:
TABLE 3 Table of correspondence between initial values of intermediate temperature proportionality coefficients and values of the speed-limited afterload instruction power without primary frequency modulation
| D0(MW) | 40％Pe | 50％Pe | 60％Pe | 70％Pe | 80％Pe | 90％Pe | 100％Pe |
| Initial value K0R | 2.5 | 2.6 | 2.7 | 2.8 | 3 | 2.9 | 2.8 |
Wherein D is0The power value of the speed-limited afterload instruction without primary frequency modulation is Pe the rated power of the generator set, K0RIs the initial value of the intermediate point temperature proportionality coefficient.
The corresponding relationship between the dynamic correction coefficient of the cumulative change times of the small-amplitude load and the statistical result of the times of the small-amplitude load within the preset time period is shown in table 4:
table 4 table of correspondence between dynamic correction coefficient of cumulative change times of small load and statistical result of small change times of load in the preset time period
| RT | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| CRT | 1 | 1.02 | 1.05 | 1.08 | 1.12 | 1.16 | 1.2 |
Wherein R isTA small-amplitude variable load frequency statistical result in the preset time period, CRTAnd dynamically correcting the coefficient for the accumulated change times of the amplitude load.
And correcting the intermediate point temperature proportionality coefficient according to a second preset formula.
K＝K0R×CRT
Wherein K is the corrected intermediate point temperature proportionality coefficient, K0RAs an initial control parameter for the intermediate point temperature proportionality coefficient, CRTDynamically correcting coefficient for small amplitude load accumulated change times, and when the unit is identified to be in O mode, CRTIs 1.
Fig. 6 is a schematic structural diagram of a thermal power generating unit active mode identification control system according to an embodiment of the present invention, and as shown in fig. 6, the thermal power generating unit active mode identification control system according to the embodiment of the present invention includes: the mode identification module 601 is used for identifying the automatic generating control operation mode of the unit according to the received automatic generating control instruction and the speed-limiting after-load instruction without primary frequency modulation to obtain an identification result of the automatic generating control operation mode of the unit; a small amplitude variable load counting module 602, configured to count the number of times of small amplitude variable load of the unit to obtain a counting result if the identification result is an R mode; and a correcting module 603, configured to correct the unit master control feed forward amount and/or the unit control parameter according to the counting result. Wherein:
the pattern identification module 601 identifies the unit automatic power generation control operation pattern according to the received automatic power generation control instruction and the speed-limiting after-load instruction without primary frequency modulation, and obtains an identification result of the unit automatic power generation control operation pattern.
The small variable load counting module 602 counts the number of times of the small variable load of the generator set in the R mode to obtain a counting result.
The correction module 603 corrects the main control feed-forward quantity and/or the unit control parameter of the unit according to the counting result of the small variable load times of the unit in the preset time period in S102.
The active mode identification control system of the thermal power generating unit provided by the embodiment of the invention is used for correcting the main control feed-forward quantity and/or the control parameters of the unit by identifying the automatic generation control operation mode of the unit and analyzing the accumulated small variable load times, so that the control parameters of the unit are ensured to be matched with the actual working condition in real time, the adverse effects on the safety and the performance of the unit caused by the unmatched parameters are avoided, the adjustment quality of the control system of the unit is effectively improved, the networking supporting capability of the unit is improved, the accumulated small variable load times are analyzed, the feed-forward shortage caused by the excessively short duration time of the variable load can be compensated, the problem that the main steam pressure is seriously undervoltage in the later period due to the weakening of the feed-forward quantity after the small variable load occurs when the unit is in the R mode is avoided, the performance of the unit is improved, and the operation safety of the unit is ensured.
On the basis of the foregoing embodiments, further, the pattern recognition module includes: the numerical value calculation unit is used for calculating the absolute value of the difference value of each automatic power generation control instruction power value and the speed-limiting after-load instruction power value without primary frequency modulation, and obtaining the absolute value result corresponding to each automatic power generation control instruction; and the numerical value judging unit is used for judging that the accumulated quantity of absolute value results corresponding to the automatic power generation control command which is more than or equal to the first overshoot value and less than the second overshoot value is more than a preset value, and identifying that the unit operation mode is an R mode. Wherein:
and the numerical value calculation unit makes a difference between the power value of each automatic power generation control instruction and the power value of the speed-limited after-load instruction without primary frequency modulation, and obtains an absolute value result corresponding to each automatic power generation control instruction by taking an absolute value of the difference.
And the numerical value judging unit compares an absolute value result corresponding to the automatic power generation control instruction obtained by the data calculating unit with the first overshoot value and the second overshoot value, and identifies that the unit operation mode is an R mode when the absolute value result corresponding to the automatic power generation control instruction is greater than or equal to the first overshoot value and smaller than the second overshoot value and the accumulated occurrence frequency is greater than a preset value.
On the basis of the foregoing embodiments, further, the small variable load counting module includes: the small-amplitude variable load identification unit is used for counting the small-amplitude variable load of the unit once when the absolute value result corresponding to the automatic power generation control command is larger than or equal to a first overshoot value and smaller than a second overshoot value when the unit is judged to be in the R mode; and the counting unit is used for counting the total times of small-amplitude load changes of the unit in a preset time period and taking the total times as the counting result. Wherein:
and when the small variable load identification unit identifies that the unit is in the R mode, counting absolute value results corresponding to the automatic power generation control commands which are more than or equal to the first overshoot value and less than the second overshoot value.
The counting unit counts the total times of small-amplitude variable load of the unit in a preset time period.
On the basis of the foregoing embodiments, further, the modification module includes: the first parameter acquisition unit is used for acquiring a main control feed-forward quantity correction coefficient of the unit according to the speed-limiting after-load instruction power value without primary frequency modulation; obtaining a dynamic correction coefficient of the accumulated change times of the small-amplitude load according to the counting result; and the first correction unit is used for obtaining the corrected main control feed-forward quantity of the unit according to the main control feed-forward quantity correction coefficient of the unit, the dynamic correction coefficient of the accumulative change times of the small-amplitude load and a first preset formula. Wherein:
and the first parameter acquisition unit acquires a corresponding unit main control feed forward quantity correction coefficient according to the speed-limiting after-load instruction power value without primary frequency modulation, and acquires a small-amplitude load accumulated change time dynamic correction coefficient according to a small-amplitude load change time statistical result in the preset time period.
And the first correction unit substitutes the unit main control feed-forward quantity correction coefficient and the small-amplitude load accumulated change time dynamic correction coefficient into a first preset formula to calculate the corrected unit main control feed-forward quantity and obtain the corrected unit main control feed-forward quantity.
On the basis of the foregoing embodiments, further, the first preset formula is:
ΔP＝ΔP0×CM×CRT
wherein, the delta P is the corrected main control feed-forward quantity of the unit, and the delta P0For the main control feed-forward quantity of the unit before correction, CMCorrection coefficient for main control feed forward quantity of unit, CRTDynamically correcting the coefficient for small-amplitude load accumulated change times, and when the unit is identified to be in the O mode, CRTIs 1.
On the basis of the foregoing embodiments, further, the modification module further includes: the second parameter acquisition unit is used for acquiring the initial control parameters of the unit according to the speed-limiting afterload instruction power value without primary frequency modulation; obtaining a dynamic correction coefficient of the accumulated change times of the small-amplitude load according to the counting result; and the second correction unit is used for obtaining the corrected unit control parameters according to the unit initial control parameters, the small-amplitude load accumulated change frequency dynamic correction coefficient and a second preset formula. Wherein:
and the second parameter acquisition unit acquires the corresponding unit initial control parameter according to the speed-limited after-load instruction power value without primary frequency modulation, and acquires a small-amplitude load accumulated change time dynamic correction coefficient according to a small-amplitude load change time statistical result in the preset time period.
And the second correction unit substitutes the initial unit control parameter and the small-amplitude load accumulated change time dynamic correction coefficient into a second preset formula to calculate the corrected unit control parameter to obtain the corrected unit control parameter.
On the basis of the foregoing embodiments, further, the second preset formula is:
A＝A0×CRT
wherein A is the corrected unit control parameter, A0As initial control parameters of the unit, CRTDynamically correcting coefficient for small amplitude load accumulated change times, and when the unit is identified to be in O mode, CRTIs 1.
The embodiment of the active mode identification control system for a thermal power generating unit provided by the embodiment of the present invention may be specifically configured to execute the processing flows of the above method embodiments, and the functions of the system are not described herein again, and refer to the detailed description of the above method embodiments.
Fig. 7 is a schematic physical structure diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 7, the electronic device may include: a processor (processor)701, a communication Interface (Communications Interface)702, a memory (memory)703 and a communication bus 704, wherein the processor 701, the communication Interface 702 and the memory 703 complete communication with each other through the communication bus 704. The processor 701 may call logic instructions in the memory 703 to perform the following method:
identifying the automatic generating control operation mode of the unit according to the received automatic generating control instruction and the speed-limiting after-load instruction without primary frequency modulation to obtain an identification result of the automatic generating control operation mode of the unit;
if the identification result is in the R mode, counting the small variable load times of the unit to obtain a counting result;
and correcting the main control feed-forward quantity and/or the unit control parameters of the unit according to the counting result.
In addition, the logic instructions in the memory 703 can be implemented in the form of software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as a stand-alone product. Based on such understanding, the technical solution of the present invention or a part thereof which substantially contributes to the prior art may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The present embodiment discloses a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, enable the computer to perform the method provided by the above-mentioned method embodiments, for example, comprising:
identifying the automatic generating control operation mode of the unit according to the received automatic generating control instruction and the speed-limiting after-load instruction without primary frequency modulation to obtain an identification result of the automatic generating control operation mode of the unit;
if the identification result is in the R mode, counting the small variable load times of the unit to obtain a counting result;
and correcting the main control feed-forward quantity and/or the unit control parameters of the unit according to the counting result.
The present embodiment provides a computer-readable storage medium, which stores a computer program, where the computer program causes the computer to execute the method provided by the above method embodiments, for example, the method includes:
identifying the automatic generating control operation mode of the unit according to the received automatic generating control instruction and the speed-limiting after-load instruction without primary frequency modulation to obtain an identification result of the automatic generating control operation mode of the unit;
if the identification result is in the R mode, counting the small variable load times of the unit to obtain a counting result;
and correcting the main control feed-forward quantity and/or the unit control parameters of the unit according to the counting result.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In the description herein, reference to the description of the terms "one embodiment," "a particular embodiment," "some embodiments," "for example," "an example," "a particular example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (16)
1. A thermal power generating unit active mode identification control method is characterized by comprising the following steps:
identifying the automatic generating control operation mode of the unit according to the received automatic generating control instruction and the speed-limiting after-load instruction without primary frequency modulation to obtain an identification result of the automatic generating control operation mode of the unit;
if the identification result is in the R mode, counting the small variable load times of the unit to obtain a counting result;
and correcting the main control feed-forward quantity and/or the unit control parameters of the unit according to the counting result.
2. The thermal power generating unit active mode identification control method according to claim 1, wherein the identifying the unit automatic power generation control operation mode according to the received automatic power generation control command and the speed-limiting after-load command without primary frequency modulation comprises:
calculating the absolute value of the difference value of each automatic power generation control instruction power value and the speed-limiting after-load instruction power value without primary frequency modulation to obtain an absolute value result corresponding to each automatic power generation control instruction;
and if the accumulated quantity of the absolute value results corresponding to the automatic power generation control instructions which are more than or equal to the first overshoot value and less than the second overshoot value is larger than a preset value, identifying that the unit operation mode is an R mode.
3. The thermal power generating unit active mode identification control method according to claim 1, wherein the counting the number of times of unit small variable load, and obtaining a counting result comprises:
if the operation mode of the unit is judged and known to be the R mode, and the absolute value result corresponding to the automatic power generation control command is larger than or equal to the first overshoot value and smaller than the second overshoot value, counting the small variable load of the unit once;
and counting the total times of small-amplitude variable loads of the unit in a preset time period as the counting result.
4. The thermal power generating unit active mode identification control method according to any one of claims 1 to 3, wherein the correcting the unit main control feed-forward quantity according to the counting result comprises:
acquiring a main control feed-forward quantity correction coefficient of the unit according to the speed-limited after-load instruction power value without primary frequency modulation, and acquiring a small-amplitude load accumulated change number dynamic correction coefficient according to the counting result;
and obtaining the corrected main control feed-forward quantity of the unit according to the main control feed-forward quantity correction coefficient of the unit, the small-amplitude load accumulated change frequency dynamic correction coefficient and a first preset formula.
5. The thermal power generating unit active mode identification control method according to claim 4, wherein the first preset formula is:
ΔP＝ΔP0×CM×CRT
wherein, the delta P is the corrected main control feed-forward quantity of the unit, and the delta P0For the main control feed-forward quantity of the unit before correction, CMCorrection coefficient for main control feed forward quantity of unit, CRTAnd dynamically correcting the coefficient for the accumulated change times of the small-amplitude load.
6. The thermal power generating unit active mode identification control method according to any one of claims 1 to 3, wherein the modifying the unit control parameters according to the counting result comprises:
acquiring a set initial control parameter according to the speed-limited after-load instruction power value without primary frequency modulation, and acquiring a small-amplitude load accumulated change number dynamic correction coefficient according to the counting result;
and obtaining the corrected unit control parameter according to the unit initial control parameter, the small-amplitude load accumulated change frequency dynamic correction coefficient and a second preset formula.
7. The thermal power generating unit active mode identification control method according to claim 6, wherein the second preset formula is:
A＝A0×CRT
wherein A is the corrected unit control parameter, A0As initial control parameters of the unit, CRTAnd dynamically correcting the coefficient for the accumulated change times of the small-amplitude load.
8. An active mode identification control system of a thermal power generating unit is characterized by comprising:
the mode identification module is used for identifying the automatic power generation control operation mode of the unit according to the received automatic power generation control instruction and the speed-limiting after-load instruction without primary frequency modulation to obtain an identification result of the automatic power generation control operation mode of the unit;
the small-amplitude variable load counting module is used for counting the small-amplitude variable load times of the unit to obtain a counting result if the identification result is in an R mode;
and the correction module is used for correcting the main control feed-forward quantity and/or the unit control parameters of the unit according to the counting result.
9. The thermal power generating unit active pattern recognition control system of claim 8, wherein the pattern recognition module comprises:
the numerical value calculation unit is used for calculating the absolute value of the difference value of each automatic power generation control instruction power value and the speed-limiting after-load instruction power value without primary frequency modulation, and obtaining the absolute value result corresponding to each automatic power generation control instruction;
and the numerical value judging unit is used for judging that the accumulated quantity of absolute value results corresponding to the automatic power generation control command which is more than or equal to the first overshoot value and less than the second overshoot value is more than a preset value, and identifying that the unit operation mode is an R mode.
10. The thermal power generating unit active pattern recognition control system as claimed in claim 8, wherein the small variable load counting module comprises:
the small variable load identification unit is used for judging and obtaining that the absolute value result corresponding to the automatic power generation control command is greater than or equal to a first overshoot value and smaller than a second overshoot value when the unit operation mode is an R mode, and counting the small variable load of the unit once;
and the counting unit is used for counting the total times of small-amplitude variable loads of the unit in a preset time period as the counting result.
11. The thermal power generating unit active pattern recognition control system as claimed in any one of claims 8-10, wherein the modification module comprises:
the first parameter acquisition unit is used for acquiring a main control feed-forward quantity correction coefficient of the unit according to the speed-limiting after-load instruction power value without primary frequency modulation; obtaining a dynamic correction coefficient of the cumulative change times of the small-amplitude load according to the counting result;
and the first correction unit is used for obtaining the corrected main control feed-forward quantity of the unit according to the main control feed-forward quantity correction coefficient of the unit, the dynamic correction coefficient of the accumulative change times of the small-amplitude load and a first preset formula.
12. The thermal power generating unit active mode identification control system as claimed in claim 11, wherein the first preset formula is:
ΔP＝ΔP0×CM×CRT
wherein, the delta P is the corrected main control feed-forward quantity of the unit, and the delta P0For the main control feed-forward quantity of the unit before correction, CMCorrection coefficient for main control feed forward quantity of unit, CRTAnd dynamically correcting the coefficient for the accumulated change times of the small-amplitude load.
13. The thermal power generating unit active pattern recognition control system as claimed in any one of claims 8-10, wherein the modification module further comprises:
the second parameter acquisition unit is used for acquiring the initial control parameters of the unit according to the speed-limiting afterload instruction power value without primary frequency modulation; obtaining a dynamic correction coefficient of the accumulated change times of the small-amplitude load according to the counting result;
and the second correction unit is used for obtaining the corrected unit control parameters according to the unit initial control parameters, the small-amplitude load accumulated change frequency dynamic correction coefficient and a second preset formula.
14. The thermal power generating unit active mode identification control system as claimed in claim 13, wherein the second preset formula is:
A＝A0×CRT
wherein A is the corrected unit control parameter, A0As initial control parameters of the unit, CRTAnd dynamically correcting the coefficient for the accumulated change times of the small-amplitude load.
15. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the steps of the method for controlling active mode recognition of a thermal power generating unit according to any one of claims 1 to 7 are implemented when the computer program is executed by the processor.
16. A computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the active mode identification control method for a thermal power generating unit according to any one of claims 1 to 7.
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