CN112421652A - Thermal generator set dual-redundancy primary frequency modulation method based on homologous control - Google Patents
Thermal generator set dual-redundancy primary frequency modulation method based on homologous control Download PDFInfo
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Abstract
The invention relates to the technical field of primary frequency modulation of a thermal generator set, in particular to a dual-redundancy primary frequency modulation method of the thermal generator set based on homologous control, which comprises the steps of obtaining a traditional turbine rotating speed signal group and a generator main transformer high-voltage side frequency signal group; selecting an optimal signal from a traditional turbine rotating speed signal group and a DEH side primary frequency modulation narrow-band signal group to obtain a DEH side primary frequency modulation frequency correction amount; and averaging all the CCS side primary frequency modulation narrow-band signals in the CCS side primary frequency modulation narrow-band signal group, obtaining corresponding rotating speed signals and obtaining a CCS side primary frequency modulation frequency correction quantity. According to the invention, through the judgment between the traditional turbine rotating speed signal group and the DEH side primary frequency modulation narrow-frequency signal group in the DEH system, the optimal signal is selected as the primary frequency modulation calculation basis, so that the initial stage of the power grid cycle can be identified just after exceeding the DEH system of the frequency dead zone unit, the primary frequency modulation action is started in a quick response manner, and the power grid requirement is met with the fastest speed and the maximum response capability.
Description
Technical Field
The invention relates to the technical field of primary frequency modulation of a thermal generator set, in particular to a dual-redundancy primary frequency modulation method of the thermal generator set based on homologous control.
Background
At present, a primary frequency modulation measuring point of a domestic thermal power generating unit is generally designed to be calculated by taking the difference between the rotating speed of a DEH system of a steam turbine and the rated rotating speed, the rotating speed precision of the DEH is 1rpm, and under the condition that the frequency of a power grid is subjected to small frequency difference fluctuation and frequently, the rotating speed cannot respond due to the fact that the frequency of the power grid is crossed and the result is that primary frequency modulation does not act. Even though the action responds, the frequency modulation contribution amount cannot meet the requirement. The power grid has clear regulations and requirements on each action condition, if the action condition cannot meet the requirements of the power grid, the power grid can be examined, the fluctuation of the power grid frequency occurs at any time, and if the primary frequency modulation response speed is low and the regulation quality is poor, a power grid company can carry out high-rate examination on a power plant.
Disclosure of Invention
The invention provides a thermal generator set dual-redundancy primary frequency modulation method based on homologous control, overcomes the defects of the prior art, and can effectively solve the problem that primary frequency modulation does not work because the primary frequency modulation of the existing thermal generator set is difficult to identify when small frequency difference fluctuation exists.
The technical scheme of the invention is realized by the following measures: a thermal generator set dual-redundancy primary frequency modulation method based on homologous control comprises
Acquiring a traditional steam turbine rotating speed signal group and a generator main transformer high-voltage side frequency signal group acquired by a high-precision intelligent transmitter device group, wherein the generator main transformer high-voltage side frequency signal group comprises a DEH side primary frequency modulation narrow frequency signal group, a DEH side primary frequency modulation broadband signal group, a CCS side primary frequency modulation narrow frequency signal group and a CCS side primary frequency modulation broadband signal group;
selecting an optimal signal from a traditional turbine rotating speed signal group and a DEH side primary frequency modulation narrow-band signal group, converting the optimal signal into a rotating speed signal, obtaining a DEH side primary frequency modulation frequency correction amount through the rotating speed signal and a pressure correction coefficient, and adding the correction amount to the comprehensive flow of the turbine high-speed regulating valve to act on a high-speed regulating valve;
and averaging all the CCS side primary frequency modulation narrow-band signals in the CCS side primary frequency modulation narrow-band signal set, obtaining corresponding rotating speed signals, obtaining a CCS side primary frequency modulation frequency correction amount through the rotating speed signals and the pressure correction coefficient, and superposing the correction amount on a CCS side steam turbine main control instruction.
The following is further optimization or/and improvement of the technical scheme of the invention:
the above-mentioned DEH side primary frequency modulation frequency correction of obtaining to action altitude mixture control door on the steam turbine altitude mixture control valve comprehensive flow of superposition specifically includes:
the first average value output module is used for averaging all DEH side primary frequency modulation narrow-frequency signals in the DEH side primary frequency modulation narrow-frequency signal set, and the average values are converted into first rotating speed signals after being subjected to speed limiting through the lead-lag output module;
averaging the traditional turbine rotating speed signals in the traditional turbine rotating speed signal group by a second average value output module to obtain second rotating speed signals;
the first condition judgment output module judges the first rotating speed signal and the second rotating speed signal and outputs a selected rotating speed signal;
the first weighted summation module is used for subtracting the rotating speed signal from the rated rotating speed of the unit installation and outputting a rotating speed difference;
converting the rotation speed difference into a corresponding frequency modulation load correction amount through a first piecewise function;
obtaining a pressure correction coefficient, and multiplying the frequency modulation load correction quantity and the pressure correction coefficient by a first multiplier to obtain a DEH side primary frequency modulation frequency correction quantity;
and superposing the DEH side primary frequency modulation frequency correction quantity to the comprehensive flow of the turbine high-speed regulating valve to actuate the high-speed regulating valve.
The obtaining of the pressure correction coefficient specifically includes:
setting an analog quantity and a main steam pressure value, and dividing the analog quantity and the main steam pressure value by a divider to obtain a pressure correction coefficient;
and limiting the upper limit and the lower limit of the pressure correction coefficient through a third coefficient amplification module, and outputting the adjusted pressure correction coefficient.
The above-mentioned first condition is judged output module and is judged first rotational speed signal and second rotational speed signal by first condition, specifically includes:
acquiring a signal whether a high-precision intelligent transmitter device set is put into and a DEH side system comprehensive fault signal;
the integrated fault signal of the DEH side system is subjected to non-operation through a NOT gate, and a logic and operation module performs AND operation on a non-operation result and a signal whether the high-precision intelligent transmitter device set is put into the integrated fault signal or not, and outputs an operation value;
and taking the operation value of the logic and operation module as a judgment condition, determining the output quantity of the first condition judgment output module, outputting a first rotating speed signal if the operation value is 1, and outputting a second rotating speed signal if the operation value is 0.
The specific process of obtaining the primary frequency modulation frequency correction quantity of the CCS side and adding the correction quantity to the main control command of the steam turbine of the CCS side in a superposed manner specifically comprises the following steps:
averaging all CCS side primary frequency modulation narrow-frequency signals in the CCS side primary frequency modulation narrow-frequency signal set by a third average value output module;
converting the CCS side primary frequency modulation narrow-band signal output after averaging into a rotating speed signal;
the second weighted summation module makes a difference between the rotating speed signal and the rated rotating speed of the unit installation, and outputs a rotating speed difference;
converting the rotation speed difference into a corresponding frequency modulation load correction amount through a second piecewise function;
obtaining a pressure correction coefficient corresponding to the main steam pressure set value, and multiplying the frequency modulation load correction quantity and the pressure correction coefficient by a second multiplier to obtain a primary frequency modulation frequency correction quantity;
and limiting the frequency modulation load correction quantity by a speed limiting module to obtain a primary frequency modulation frequency correction quantity of the CCS side, and superposing the primary frequency modulation frequency correction quantity on a main control instruction of a steam turbine of the CCS side.
The above-mentioned still including the unit starts the back primary control and whether inputs the judgement, specifically includes:
setting a sixth analog signal transmitter and an eighth condition judgment output module;
inputting the constant 0 output by the sixth analog signal transmitter and the correction quantity of the primary frequency modulation frequency at the CCS side into an eighth condition judgment output module;
and (3) taking a signal of whether primary frequency modulation is input as a judgment condition, outputting a primary frequency modulation frequency correction quantity of the CCS side to be superposed on a main control instruction of the CCS side steam turbine if the primary frequency modulation is input, and outputting a constant 0 to the main control instruction of the CCS side steam turbine if the primary frequency modulation is not input, without primary frequency modulation.
The invention is provided with a high-precision intelligent transmitter device group which can respectively introduce signals into a DEH system and a CCS system, so that the DEH system selects an optimal signal as a primary frequency modulation calculation basis through the judgment between a traditional turbine rotating speed signal group and a DEH side primary frequency modulation narrow-band signal group, thereby effectively realizing redundancy configuration, enabling the DEH system of the thermal power generating unit to recognize the initial stage of the power grid cyclic wave just after exceeding a frequency dead zone, quickly responding to the initial frequency modulation action, and meeting the power grid requirement with the fastest speed and the maximum response capability, thereby improving the precision and the speed of the primary frequency modulation response of the thermal power generating unit and meeting the requirement of the power grid on the primary frequency modulation response of the thermal power generating unit.
Drawings
FIG. 1 is a flow chart of example 1 of the present invention.
FIG. 2 is a flow chart of DEH side primary frequency modulation in example 2 of the present invention.
Fig. 3 is a flowchart of CCS-side primary frequency modulation in embodiment 3 of the present invention.
The codes in the figures are respectively: 1 is a first mean value output module, 2 is a lead-lag output module, 3 is a second mean value output module, 4 is a first condition determination output module, 5 is a first weighted sum module, 6 is a first piecewise function, 7 is a first multiplier, 8 is a second condition determination output module, 9 is a first high-low limit output module, 10 is a first coefficient amplification module, 11 is a third condition determination output module, 12 is a first analog signal transmitter, 13 is a second analog signal transmitter, 14 is a second coefficient amplification module, 15 is a divider, 16 is a third coefficient amplification module, 17 is a third analog signal transmitter, 18 is a fourth condition determination output module, 19 is a fourth analog signal transmitter, 20 is a not gate, 21 is a logical and operation module, 22 is a third mean value output module, 23 is a second weighted sum module, and 24 is a second piecewise function, 25 is a second multiplier, 26 is a rate limiting module, 27 is a fifth condition judging output module, 28 is a second high-low limit output module, 29 is a fourth coefficient amplifying module, 30 is a fifth analog signal transmitter, 31 is a third segmentation function, 32 is a sixth condition judging output module, 33 is a fourth segmentation function, 34 is a seventh condition judging output module, 35 is a sixth analog signal transmitter, and 36 is an eighth condition judging output module.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments may be determined according to the technical solutions and practical situations of the present invention.
The invention is further described with reference to the following examples and figures:
example 1: as shown in the attached figure 1, the double-redundancy primary frequency modulation method of the thermal generator set based on the homologous control comprises the steps of
S11, acquiring a traditional turbine rotating speed signal group and a generator main transformer high-voltage side frequency signal group acquired by a high-precision intelligent transmitter device group, wherein the generator main transformer high-voltage side frequency signal group comprises a DEH side primary frequency modulation narrow frequency signal group, a DEH side primary frequency modulation wide frequency signal group, a CCS side primary frequency modulation narrow frequency signal group and a CCS side primary frequency modulation wide frequency signal group;
s12, selecting an optimal signal from a traditional turbine rotating speed signal group and a DEH side primary frequency modulation narrow-band signal group, converting the optimal signal into a rotating speed signal, obtaining a DEH side primary frequency modulation frequency correction amount through the rotating speed signal and a pressure correction coefficient, and superposing the correction amount on the comprehensive flow of the turbine high-modulation valve to act on a high-modulation valve;
and S13, averaging all the CCS side primary frequency modulation narrow-frequency signals in the CCS side primary frequency modulation narrow-frequency signal set, obtaining corresponding rotating speed signals, obtaining CCS side primary frequency modulation frequency correction quantity through the rotating speed signals and the pressure correction coefficient, and superposing the correction quantity on a CCS side steam turbine main control instruction.
The invention is provided with a high-precision intelligent transmitter device group which comprises a plurality of high-precision intelligent transmitter devices, the device is a device which is based on direct acquisition system voltage and converts the power grid frequency through full-cycle fast Fourier, can respectively introduce signals into a DEH system and a CCS system, so that the optimal signal is selected as the primary frequency modulation calculation basis in the DEH system through the judgment between the traditional turbine rotating speed signal group and the DEH side primary frequency modulation narrow-band signal group, thereby effectively realizing redundant configuration, leading the initial stage of the power grid cycle to be identified just after exceeding the DEH system of the frequency dead zone unit, quickly responding to start a primary frequency modulation action, the method has the advantages that the requirement of the power grid is met with the fastest speed and the maximum response capability, so that the accuracy and the speed of the primary frequency modulation response of the thermal power generating unit are improved, and the requirement of the power grid on the primary frequency modulation response of the thermal power generating unit is met.
Above-mentioned technical scheme high accuracy intelligence changer device group can include three high accuracy intelligence changer device, can include three routes DEH side primary frequency modulation narrow-band signal and three routes CCS side primary frequency modulation narrow-band signal in the generator owner that high accuracy intelligence changer device group gathered, and traditional steam turbine rotational speed signal group also can include the traditional rotational speed of three routes.
Example 2: as shown in fig. 2, this embodiment also discloses a dual-redundancy primary frequency modulation method for a thermal power generating unit based on homologous control, and for embodiment 1, this embodiment further discloses a specific process of obtaining a correction quantity of a primary frequency modulation frequency at a DEH side and superimposing the correction quantity on a comprehensive flow of a turbine high-speed regulating valve to actuate a high-speed regulating valve, which specifically includes:
s21, averaging all DEH side primary frequency modulation narrow-band signals in the DEH side primary frequency modulation narrow-band signal set by the first average value output module 1, and converting the average value into a first rotating speed signal after carrying out speed limiting by the lead-lag output module 2;
s22, averaging the traditional turbine rotating speed signals in the traditional turbine rotating speed signal group by the second average value output module 3 to obtain second rotating speed signals;
s23, the first condition judgment output module 4 judges the first rotating speed signal and the second rotating speed signal and outputs the selected rotating speed signal;
s24, the first weighted summation module 5 makes a difference between the rotating speed signal and the rated rotating speed of the unit installation, and outputs a rotating speed difference;
s25, converting the rotating speed difference into a corresponding frequency modulation load correction quantity through a first piecewise function 6;
s26, obtaining a pressure correction coefficient, and multiplying the frequency modulation load correction quantity by the pressure correction coefficient through a first multiplier 7 to obtain a DEH side primary frequency modulation frequency correction quantity;
and S27, adding the DEH side primary frequency modulation frequency correction quantity to the comprehensive flow of the turbine high-speed regulating valve to actuate the high-speed regulating valve.
The step S21 of the above technical solution may specifically include:
1. averaging all DEH side primary frequency modulation narrow-band signals in the DEH side primary frequency modulation narrow-band signal set by a first average value output module 1; after the average value is obtained, the average value and the DEH side primary frequency modulation broadband signal can be input into a second condition judgment output module 8, the average value DEH side primary frequency modulation narrow-band signal is output to a first high-low limit output module 9, the output signal of the first high-low limit output module 9 is used as a judgment condition, if the DEH side primary frequency modulation narrow-band signal is within the threshold range of the second high-low limit output module, the DEH side primary frequency modulation broadband signal is output, otherwise, the DEH side primary frequency modulation narrow-band signal is output;
2. the average DEH side primary frequency modulation narrow-band signal is subjected to rate limitation by the lead-lag output module 2;
3. the frequency signal output by the lead-lag output block 2 is multiplied by a coefficient 60 by a first coefficient amplification block 10 to be converted into a first rotation speed signal.
In the above technical solution, a primary frequency modulation experiment block may be introduced between step S23 and step S24, that is, a third condition judgment output module 11 and a first analog signal transmitter 12 are provided, an analog signal generated by the first analog signal transmitter 12 and the rotation speed signal selected in step S23 are input to the third condition judgment output module 11, an experiment signal is used as a judgment condition, if there is an experiment signal, an analog signal is output to step S24, a primary frequency modulation experiment is performed, if there is no experiment signal, the rotation speed signal selected in step S23 is output to step S24, and an actual primary frequency modulation is performed.
In the above technical solution, the rated rotation speed of the assembly machine in step S24 can be set by the second analog signal transmitter 13, and can be 3000 rpm.
After the rotation speed difference is converted into the corresponding frequency modulation load correction amount through the first piecewise function 6 in step S25, the frequency modulation load correction amount may be amplified by the second coefficient amplifying module 14, and the coefficient setting range is-10 to 10, and is usually 1.
The double-redundancy primary frequency modulation method of the thermal generator set based on the homologous control in the embodiment 2 can be further optimized or/and improved according to actual needs:
as shown in fig. 2, the obtaining of the pressure correction coefficient in S26 specifically includes:
s261, setting an analog quantity and a main steam pressure value, and dividing the analog quantity and the main steam pressure value by a divider 15 to obtain a pressure correction coefficient;
s262, the third coefficient amplifying module 16 limits the upper and lower limits of the pressure correction coefficient, and outputs the adjusted pressure correction coefficient (the upper limit may be 2.0, and the lower limit may be 0.9).
In step S261, the analog quantity may be generated by the third analog signal transmitter 17, specifically, may be set to 24.2. The main steam pressure value may be set in the range of 1 to 100.
In step S262 of the above-mentioned technical solution, the third coefficient amplification module 16 outputs the adjusted pressure correction coefficient, and the pressure correction coefficient may also be subjected to condition judgment by the fourth condition judgment output module 18, that is, the pressure correction coefficient and the analog quantity "1" generated by the fourth analog signal transmitter 19 are input to the fourth condition judgment output module 18, and a signal indicating whether the high-precision intelligent transmitter device group is put into operation is a judgment condition, and if the high-precision intelligent transmitter device group is put into operation, the pressure correction coefficient is output, otherwise, the analog quantity "1" is output.
As shown in fig. 2, the step S23 of determining the first rotation speed signal and the second rotation speed signal by the first condition determination output module 4 specifically includes:
s231, acquiring a signal indicating whether the high-precision intelligent transmitter device set is put into and a DEH side system comprehensive fault signal;
s232, carrying out non-operation on the DEH side system comprehensive fault signal through the NOT gate 20, carrying out AND operation on a non-operation result and a signal of whether the high-precision intelligent transmitter device set is put into or not through the logic AND operation module 21, and outputting an operation value;
s233, using the operation value of the and operation module 21 as a determination condition, determines the output quantity of the first condition determination output module 4, and outputs the first rotation speed signal if the operation value is 1, and outputs the second rotation speed signal if the operation value is 0.
The signal whether the high-precision intelligent transmitter device group is put into is '0' or '1', and the DEH side system comprehensive fault signal is '0' or '1'.
Example 3: as shown in fig. 3, this embodiment also discloses a dual-redundancy primary frequency modulation method for a thermal power generating unit based on homologous control, and for embodiment 1, this embodiment further discloses a specific process of obtaining a CCS-side primary frequency modulation frequency correction amount and superimposing the acquired CCS-side primary frequency modulation frequency correction amount on a CCS-side steam turbine main control instruction, which specifically includes:
s31, averaging all CCS-side primary frequency-modulated narrow-band signals in the CCS-side primary frequency-modulated narrow-band signal set by the third average output module 22;
s32, converting the averaged output CCS side primary frequency modulation narrow-frequency signal into a rotating speed signal;
s33, the second weighted sum module 23 makes a difference between the rotating speed signal and the rated rotating speed of the unit installation, and outputs a rotating speed difference;
s34, converting the rotating speed difference into a corresponding frequency modulation load correction quantity through a second piecewise function 24;
s35, obtaining a pressure correction coefficient corresponding to the main steam pressure set value, and multiplying the frequency modulation load correction quantity and the pressure correction coefficient by a second multiplier 25 to obtain a primary frequency modulation frequency correction quantity;
and S36, limiting the frequency modulation load correction quantity by the speed limiting module 26, obtaining a CCS side primary frequency modulation frequency correction quantity, and adding the correction quantity to a CCS side steam turbine main control instruction.
In the above technical solution, step S31 obtains the averaged CCS-side primary frequency modulation narrow-band signal, and a fifth condition determination output module 27 may be further introduced to compare and determine the averaged CCS-side primary frequency modulation wide-band signal, where the process is as follows:
averaging all the CCS-side primary frequency modulation narrow-band signals in the CCS-side primary frequency modulation narrow-band signal group by a third average value output module 22; after the averaging, the averaged CCS-side primary frequency modulation wideband signal and the CCS-side primary frequency modulation wideband signal may be input to the fifth condition judgment output module 27, the averaged CCS-side primary frequency modulation narrowband signal is output to the second high-low limit output module 28, an output signal of the second high-low limit output module 28 is used as a judgment condition, if the CCS-side primary frequency modulation narrowband signal is within the threshold range of the second high-low limit output module 28, the CCS-side primary frequency modulation wideband signal is output, otherwise, the CCS-side primary frequency modulation narrowband signal is output.
In the above technical solution, in step S32, the fourth coefficient amplification module 29 may convert the averaged CCS-side primary frequency modulation narrow-band signal into a rotation speed signal, and the coefficient of the fourth coefficient amplification module 29 is 60. The rated rotation speed of the machine assembling machine in the step S33 can be generated by the fifth analog signal transmitter 30.
In step S34 of the above technical solution, after the rotation speed difference is converted into the corresponding frequency modulation load correction amount by the second piecewise function 24, a condition judgment may be further introduced to make the frequency modulation load correction amount more accurate, specifically as follows:
1. obtaining the actual rotating speed difference, and converting the actual rotating speed difference into a corresponding frequency modulation load correction amount through a third piecewise function 31;
2. introducing a sixth condition judgment output module 32, inputting the frequency modulation load correction amount converted by the frequency modulation load correction amount and the second section function 24 into the sixth condition judgment output module 32, taking a signal of whether the high-precision intelligent transmitter device set is input as a judgment condition, if the high-precision intelligent transmitter device set is input, the sixth condition judgment output module 32 outputs the frequency modulation load correction amount converted by the second section function 24, otherwise, the frequency modulation load correction amount converted by the third section function 31.
In step S35, the pressure correction coefficient corresponding to the main steam pressure set value can be obtained by converting the fourth segmentation function 33.
In step S36 of the above technical solution, when the primary frequency modulation frequency correction is input to the rate limiting module 26, a primary frequency modulation experiment block may be introduced, that is, the seventh condition determination output module 34 is set to obtain a DEH frequency modulation experiment signal and a primary frequency modulation load, the primary frequency modulation load and the primary frequency modulation frequency correction are input to the seventh condition determination output module 34, the DEH frequency modulation experiment signal is used as a determination condition, if there is an experiment signal, the primary frequency modulation load is output to the rate limiting module 26 to perform a primary frequency modulation experiment, otherwise, the primary frequency modulation frequency correction is output to the rate limiting module 26 to perform actual primary frequency modulation.
The double-redundancy primary frequency modulation method of the thermal generator set based on the homologous control in the embodiment 3 can be further optimized or/and improved according to actual needs:
as shown in fig. 3, when the acquired CCS-side primary frequency modulation frequency correction amount is superimposed on the CCS-side steam turbine main control instruction, the method further includes determining whether the primary frequency modulation is input after the unit is started, and specifically includes:
s361, setting a sixth analog signal transmitter 35 and an eighth conditional access output module 36;
s362, inputting both the constant 0 and the CCS-side primary frequency modulation frequency correction quantity output by the sixth analog signal transmitter 35 to the eighth condition judgment output module 36;
and S363, taking a signal of whether primary frequency modulation is input as a judgment condition, outputting a primary frequency modulation frequency correction quantity of the CCS side to be superposed on the main control instruction of the steam turbine of the CCS side if the primary frequency modulation is input, and outputting a constant 0 to the main control instruction of the steam turbine of the CCS side if the primary frequency modulation is not input, without primary frequency modulation.
The above technical features constitute the best embodiment of the present invention, which has strong adaptability and best implementation effect, and unnecessary technical features can be increased or decreased according to actual needs to meet the requirements of different situations.
Claims (8)
1. A thermal generator set dual-redundancy primary frequency modulation method based on homologous control is characterized by comprising the following steps:
acquiring a traditional steam turbine rotating speed signal group and a generator main transformer high-voltage side frequency signal group acquired by a high-precision intelligent transmitter device group, wherein the generator main transformer high-voltage side frequency signal group comprises a DEH side primary frequency modulation narrow frequency signal group, a DEH side primary frequency modulation broadband signal group, a CCS side primary frequency modulation narrow frequency signal group and a CCS side primary frequency modulation broadband signal group;
selecting an optimal signal from a traditional turbine rotating speed signal group and a DEH side primary frequency modulation narrow-band signal group, converting the optimal signal into a rotating speed signal, obtaining a DEH side primary frequency modulation frequency correction amount through the rotating speed signal and a pressure correction coefficient, and adding the correction amount to the comprehensive flow of the turbine high-speed regulating valve to act on a high-speed regulating valve;
and averaging all the CCS side primary frequency modulation narrow-band signals in the CCS side primary frequency modulation narrow-band signal set, obtaining corresponding rotating speed signals, obtaining a CCS side primary frequency modulation frequency correction amount through the rotating speed signals and the pressure correction coefficient, and superposing the correction amount on a CCS side steam turbine main control instruction.
2. The thermal generator set dual-redundancy primary frequency modulation method based on homologous control according to claim 1, wherein the obtaining a DEH-side primary frequency modulation frequency correction amount and superimposing the obtained result on the integrated flow of the turbine high-speed regulating valve to actuate the high-speed regulating valve specifically comprises:
the first average value output module is used for averaging all DEH side primary frequency modulation narrow-frequency signals in the DEH side primary frequency modulation narrow-frequency signal set, and the average values are converted into first rotating speed signals after being subjected to speed limiting through the lead-lag output module;
averaging the traditional turbine rotating speed signals in the traditional turbine rotating speed signal group by a second average value output module to obtain second rotating speed signals;
the first condition judgment output module judges the first rotating speed signal and the second rotating speed signal and outputs a selected rotating speed signal;
the first weighted summation module is used for subtracting the rotating speed signal from the rated rotating speed of the unit installation and outputting a rotating speed difference;
converting the rotation speed difference into a corresponding frequency modulation load correction amount through a first piecewise function;
obtaining a pressure correction coefficient, and multiplying the frequency modulation load correction quantity and the pressure correction coefficient by a first multiplier to obtain a DEH side primary frequency modulation frequency correction quantity;
and superposing the DEH side primary frequency modulation frequency correction quantity to the comprehensive flow of the turbine high-speed regulating valve to actuate the high-speed regulating valve.
3. The thermal generator set dual-redundancy primary frequency modulation method based on homologous control according to claim 2, wherein the obtaining of the pressure correction coefficient specifically comprises:
setting an analog quantity and a main steam pressure value, and dividing the analog quantity and the main steam pressure value by a divider to obtain a pressure correction coefficient;
and limiting the upper limit and the lower limit of the pressure correction coefficient through a third coefficient amplification module, and outputting the adjusted pressure correction coefficient.
4. The thermal generator set dual-redundancy primary frequency modulation method based on homologous control according to claim 2 or 3, wherein the determining of the first rotation speed signal and the second rotation speed signal by the first condition determination output module specifically comprises:
acquiring a signal whether a high-precision intelligent transmitter device set is put into and a DEH side system comprehensive fault signal;
the integrated fault signal of the DEH side system is subjected to non-operation through a NOT gate, and a logic and operation module performs AND operation on a non-operation result and a signal whether the high-precision intelligent transmitter device set is put into the integrated fault signal or not, and outputs an operation value;
and taking the operation value of the logic and operation module as a judgment condition, determining the output quantity of the first condition judgment output module, outputting a first rotating speed signal if the operation value is 1, and outputting a second rotating speed signal if the operation value is 0.
5. The dual-redundancy primary frequency modulation method for the thermal generator set based on the homologous control according to claim 1, 2 or 3, wherein the specific process of obtaining the CCS-side primary frequency modulation frequency correction and superimposing the CCS-side primary frequency modulation frequency correction on the CCS-side steam turbine main control command includes:
averaging all CCS side primary frequency modulation narrow-frequency signals in the CCS side primary frequency modulation narrow-frequency signal set by a third average value output module;
converting the CCS side primary frequency modulation narrow-band signal output after averaging into a rotating speed signal;
the second weighted summation module makes a difference between the rotating speed signal and the rated rotating speed of the unit installation, and outputs a rotating speed difference;
converting the rotation speed difference into a corresponding frequency modulation load correction amount through a second piecewise function;
obtaining a pressure correction coefficient corresponding to the main steam pressure set value, and multiplying the frequency modulation load correction quantity and the pressure correction coefficient by a second multiplier to obtain a primary frequency modulation frequency correction quantity;
and limiting the frequency modulation load correction quantity by a speed limiting module to obtain a primary frequency modulation frequency correction quantity of the CCS side, and superposing the primary frequency modulation frequency correction quantity on a main control instruction of a steam turbine of the CCS side.
6. The dual-redundancy primary frequency modulation method for a thermal generator set based on homologous control according to claim 4, wherein the specific process of obtaining the CCS-side primary frequency modulation frequency correction quantity and superimposing the CCS-side primary frequency modulation frequency correction quantity on the CCS-side steam turbine main control command specifically comprises:
averaging all CCS side primary frequency modulation narrow-frequency signals in the CCS side primary frequency modulation narrow-frequency signal set by a third average value output module;
converting the CCS side primary frequency modulation narrow-band signal output after averaging into a rotating speed signal;
the second weighted summation module makes a difference between the rotating speed signal and the rated rotating speed of the unit installation, and outputs a rotating speed difference;
converting the rotation speed difference into a corresponding frequency modulation load correction amount through a second piecewise function;
obtaining a pressure correction coefficient corresponding to the main steam pressure set value, and multiplying the frequency modulation load correction quantity and the pressure correction coefficient by a second multiplier to obtain a primary frequency modulation frequency correction quantity;
and limiting the frequency modulation load correction quantity by a speed limiting module to obtain a primary frequency modulation frequency correction quantity of the CCS side, and superposing the primary frequency modulation frequency correction quantity on a main control instruction of a steam turbine of the CCS side.
7. The dual-redundancy primary frequency modulation method for the thermal generator set based on the homologous control as claimed in claim 5, wherein the method further comprises judging whether primary frequency modulation is input after the set is started, and specifically comprises:
setting a sixth analog signal transmitter and an eighth condition judgment output module;
inputting the constant 0 output by the sixth analog signal transmitter and the correction quantity of the primary frequency modulation frequency at the CCS side into an eighth condition judgment output module;
and (3) taking a signal of whether primary frequency modulation is input as a judgment condition, outputting a primary frequency modulation frequency correction quantity of the CCS side to be superposed on a main control instruction of the CCS side steam turbine if the primary frequency modulation is input, and outputting a constant 0 to the main control instruction of the CCS side steam turbine if the primary frequency modulation is not input, without primary frequency modulation.
8. The dual-redundancy primary frequency modulation method for the thermal generator set based on the homologous control as claimed in claim 6, wherein the method further comprises judging whether primary frequency modulation is input after the set is started, and specifically comprises:
setting a sixth analog signal transmitter and an eighth condition judgment output module;
inputting the constant 0 output by the sixth analog signal transmitter and the correction quantity of the primary frequency modulation frequency at the CCS side into an eighth condition judgment output module;
and (3) taking a signal of whether primary frequency modulation is input as a judgment condition, outputting a primary frequency modulation frequency correction quantity of the CCS side to be superposed on a main control instruction of the CCS side steam turbine if the primary frequency modulation is input, and outputting a constant 0 to the main control instruction of the CCS side steam turbine if the primary frequency modulation is not input, without primary frequency modulation.
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