Dual-redundant primary frequency regulation method for thermal power generating units based on homologous control

Abstract

The present invention relates to the technical field of primary frequency regulation of a thermal power generator set, and is a dual-redundancy primary frequency regulation method for a thermal power generator set based on homologous control, including obtaining a traditional steam turbine speed signal group and a generator main transformer high-voltage side frequency signal group; selecting the optimal signal from the traditional steam turbine speed signal group and the DEH side primary frequency regulation narrow-band signal group, and obtaining the DEH side primary frequency regulation frequency correction amount; taking the average of all CCS side primary frequency regulation narrow-band signals in the CCS side primary frequency regulation narrow-band signal group, and obtaining the corresponding speed signal, and obtaining the CCS side primary frequency regulation frequency correction amount. In the DEH system, the present invention selects the optimal signal as the basis for primary frequency regulation calculation by judging between the traditional steam turbine speed signal group and the DEH side primary frequency regulation narrow-band signal group, so that the DEH system of the unit can recognize that the power grid cycle exceeds the frequency dead zone at the initial stage, and quickly responds to start the primary frequency regulation action, so as to meet the power grid requirements with the fastest speed and the greatest response capability.

Description

Technical Field

[0001] The invention relates to the technical field of primary frequency regulation of a thermal power generating set, in particular to a dual-redundancy primary frequency regulation method of a thermal power generating set based on homologous control. Background Art

[0002] At present, the primary frequency regulation measurement point of domestic thermal power units is generally designed to be calculated by taking the difference between the speed of the steam turbine DEH system and the rated speed, and the speed accuracy of DEH is 1rpm. When the power grid frequency fluctuates frequently with a small frequency difference, the power grid frequency has crossed the line due to accuracy reasons, but the speed fails to respond, resulting in no action in the primary frequency regulation. Even if the action responds sometimes, the contribution of frequency regulation cannot meet the requirements. The power grid has clear regulations and requirements for each action. If the requirements of the power grid cannot be met, an assessment will be conducted. The fluctuation of the power grid frequency occurs at any time. If the primary frequency regulation response speed is slow and the regulation quality is poor, the power grid company will conduct a high assessment on the power plant. Summary of the invention

[0003] The present invention provides a dual redundant primary frequency modulation method for a thermal power generating set based on homologous control, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the problem that the primary frequency modulation of the existing thermal power generating set is difficult to identify when there is a slight frequency difference fluctuation, resulting in the primary frequency modulation not working.

[0004] The technical solution of the present invention is achieved by the following measures: a dual redundant primary frequency modulation method of a thermal power generating set based on homologous control, comprising:

[0005] Obtaining a conventional steam turbine speed signal group and a generator main transformer high-voltage side frequency signal group collected by a high-precision intelligent transmitter device group, wherein the generator main transformer high-voltage side frequency signal group includes 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;

[0006] Select the best signal from the traditional steam turbine speed signal group and the DEH side primary frequency modulation narrow-band signal group, convert it into a speed signal, obtain the DEH side primary frequency modulation frequency correction amount through the speed signal and the pressure correction coefficient, and add it to the comprehensive flow of the steam turbine high-speed regulating valve to actuate the high-speed regulating valve;

[0007] The average of all CCS-side primary frequency modulation narrow-band signals in the CCS-side primary frequency modulation narrow-band signal group is taken, and the corresponding speed signal is obtained. The primary frequency modulation frequency correction amount on the CCS side is obtained through the speed signal and the pressure correction coefficient, and is superimposed on the CCS-side steam turbine main control instruction.

[0008] The following are further optimizations and / or improvements to the above technical solutions:

[0009] The above-mentioned primary frequency modulation frequency correction amount on the DEH side is obtained and added to the comprehensive flow of the turbine high-speed regulating valve to actuate the high-speed regulating valve, which specifically includes:

[0010] The first average output module averages all DEH side primary frequency modulation narrow-frequency signals in the DEH side primary frequency modulation narrow-frequency signal group, and converts them into the first speed signal after rate limiting through the lead-lag output module;

[0011] The second average output module averages the traditional steam turbine speed signals in the traditional steam turbine speed signal group to obtain a second speed signal;

[0012] The first condition judgment output module judges the first speed signal and the second speed signal and outputs the selected speed signal;

[0013] The first weighted summation module performs subtraction of the speed signal and the rated speed of the machine assembly, and outputs the speed difference;

[0014] The speed difference is converted into a corresponding frequency modulation load correction value through a first piecewise function;

[0015] The pressure correction coefficient is obtained, and the first multiplier multiplies the frequency modulation load correction amount and the pressure correction coefficient to obtain the primary frequency modulation frequency correction amount on the DEH side;

[0016] The primary frequency modulation frequency correction amount on the DEH side is added to the comprehensive flow of the turbine high-speed regulating valve to actuate the high-speed regulating valve.

[0017] The pressure correction coefficient obtained above specifically includes:

[0018] Set the analog quantity and the main steam pressure value, and use the divider to divide the analog quantity and the main steam pressure value to obtain the pressure correction coefficient;

[0019] The pressure correction coefficient is limited to upper and lower limits by the third coefficient amplification module, and the adjusted pressure correction coefficient is output.

[0020] The first condition judgment output module judges the first speed signal and the second speed signal, specifically including:

[0021] Obtain the signal of whether the high-precision intelligent transmitter device group is put into use and the comprehensive fault signal of the DEH side system;

[0022] The comprehensive fault signal of the DEH side system is not operated through the NOT gate, and the logic AND operation module performs AND operation on the NOT operation result and the signal of whether the high-precision intelligent transmitter device group is put into use, and outputs the operation value;

[0023] The operation value of the logic and operation module is used as a judgment condition to determine the output of the first condition judgment output module. If the operation value is 1, the first speed signal is output; if the operation value is 0, the second speed signal is output.

[0024] The specific process of obtaining the primary frequency modulation correction value on the CCS side and superimposing it on the steam turbine master control instruction on the CCS side specifically includes:

[0025] The third average output module takes an average of all CCS-side primary frequency modulation narrow-band signals in the CCS-side primary frequency modulation narrow-band signal group;

[0026] Convert the CCS side primary frequency modulation narrow-band signal output after averaging into a speed signal;

[0027] The second weighted summation module performs subtraction between the speed signal and the rated speed of the machine assembly, and outputs the speed difference;

[0028] The speed difference is converted into a corresponding frequency modulation load correction value through a second piecewise function;

[0029] The pressure correction coefficient corresponding to the main steam pressure setting value is obtained, and the second multiplier multiplies the frequency modulation load correction amount and the pressure correction coefficient to obtain the primary frequency modulation frequency correction amount;

[0030] The rate limiting module limits the frequency regulation load correction, obtains the primary frequency regulation frequency correction on the CCS side, and superimposes it on the steam turbine master control instruction on the CCS side.

[0031] The above also includes the judgment of whether the primary frequency regulation is put into use after the unit is started, including:

[0032] Setting a sixth analog signal transmitter and an eighth condition judgment output module;

[0033] Input the constant 0 output by the sixth analog signal transmitter and the primary frequency modulation frequency correction value on the CCS side into the eighth condition judgment output module;

[0034] The signal indicating whether the primary frequency modulation is put into operation is used as the judgment condition. If the primary frequency modulation is put into operation, the primary frequency modulation frequency correction amount is output on the CCS side and superimposed on the steam turbine main control instruction on the CCS side. If the primary frequency modulation is not put into operation, the constant 0 is output to the steam turbine main control instruction on the CCS side, and the primary frequency modulation is not performed.

[0035] The present invention is provided with a high-precision intelligent transmitter device group, which can introduce signals into the DEH system and the CCS system respectively, so that in the DEH system, the optimal signal is selected as the basis for primary frequency regulation calculation through judgment between the traditional turbine speed signal group and the DEH side primary frequency regulation narrow-band signal group, thereby effectively realizing redundant configuration, so that the DEH system of the unit can recognize as soon as the frequency dead zone exceeds the initial stage of the power grid cycle, and quickly respond to start the primary frequency regulation action, so as to meet the power grid requirements with the fastest speed and the greatest response capability, thereby improving the accuracy and speed of the primary frequency regulation response of the thermal power unit, and meeting the power grid requirements for the primary frequency regulation response of the thermal power unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Attached Figure 1 This is a flow chart of Example 1 of the present invention.

[0037] Attached Figure 2 This is a flow chart of the primary frequency modulation on the DEH side in Example 2 of the present invention.

[0038] Attached Figure 3 This is a flow chart of a primary frequency modulation on the CCS side in Embodiment 3 of the present invention.

[0039] The codes in the accompanying drawings are: 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 conditional judgment output module, 5 is a first weighted summation module, 6 is a first piecewise function, 7 is a first multiplier, 8 is a second conditional judgment output module, 9 is a first high and low limit output module, 10 is a first coefficient amplification module, 11 is a third conditional judgment 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 conditional judgment Output module, 19 is the fourth analog signal transmitter, 20 is the NOT gate, 21 is the logic and operation module, 22 is the third mean output module, 23 is the second weighted summation module, 24 is the second piecewise function, 25 is the second multiplier, 26 is the rate limiting module, 27 is the fifth conditional judgment output module, 28 is the second high and low limit output module, 29 is the fourth coefficient amplification module, 30 is the fifth analog signal transmitter, 31 is the third piecewise function, 32 is the sixth conditional judgment output module, 33 is the fourth piecewise function, 34 is the seventh conditional judgment output module, 35 is the sixth analog signal transmitter, and 36 is the eighth conditional judgment output module. DETAILED DESCRIPTION

[0040] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0041] The present invention will be further described below in conjunction with embodiments and drawings:

[0042] Embodiment 1: As attached Figure 1 As shown, the dual redundant primary frequency regulation method of thermal power generating units based on homologous control includes:

[0043] S11, obtaining a conventional steam turbine speed signal group and a generator main transformer high-voltage side frequency signal group collected by a high-precision intelligent transmitter device group, wherein the generator main transformer high-voltage side frequency signal group includes 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;

[0044] S12, select the best signal from the conventional steam turbine speed signal group and the DEH side primary frequency modulation narrow-band signal group, convert it into a speed signal, obtain the DEH side primary frequency modulation frequency correction amount through the speed signal and the pressure correction coefficient, and add it to the comprehensive flow of the steam turbine high-speed regulating valve to actuate the high-speed regulating valve;

[0045] S13, taking the average of all CCS side primary frequency modulation narrow-band signals in the CCS side primary frequency modulation narrow-band signal group, and obtaining the corresponding speed signal, obtaining the CCS side primary frequency modulation frequency correction amount through the speed signal and the pressure correction coefficient, and superimposing it on the CCS side steam turbine main control instruction.

[0046] The present invention is provided with a high-precision intelligent transmitter device group, which includes multiple high-precision intelligent transmitter devices. The device is a grid frequency device based on direct-acquisition system voltage and full-cycle fast Fourier transformation, which can introduce signals into the DEH system and the CCS system respectively, so that in the DEH system, the optimal signal is selected as the basis for primary frequency regulation calculation through judgment between the traditional turbine speed signal group and the DEH side primary frequency regulation narrow-band signal group, thereby effectively realizing redundant configuration, so that the DEH system of the unit can recognize as soon as the grid cycle exceeds the frequency dead zone at the beginning stage, and quickly respond to start the primary frequency regulation action, so as to meet the grid requirements with the fastest speed and the greatest response capability, thereby improving the accuracy and speed of the primary frequency regulation response of the thermal power unit, and meeting the grid requirements for the primary frequency regulation response of the thermal power unit.

[0047] In the above technical solution, the high-precision intelligent transmitter device group may include three high-precision intelligent transmitter devices. The frequency signal group on the high-voltage side of the main transformer of the generator collected by the high-precision intelligent transmitter device group may include three DEH side primary frequency modulation narrow-frequency signals and three CCS side primary frequency modulation narrow-frequency signals. The traditional turbine speed signal group may also include three traditional speeds.

[0048] Embodiment 2: As attached Figure 2As shown, this embodiment also discloses a dual redundant primary frequency regulation method for a thermal power generator set based on homologous control. With respect to Embodiment 1, this embodiment further discloses a specific process of obtaining a primary frequency regulation frequency correction amount on the DEH side and superimposing it on the comprehensive flow of the high-speed regulating valve of the steam turbine to actuate the high-speed regulating valve, which specifically includes:

[0049] S21, the first average output module 1 takes the average of all DEH side primary frequency modulation narrow-band signals in the DEH side primary frequency modulation narrow-band signal group, and converts them into a first speed signal after rate limiting through the lead-lag output module 2;

[0050] S22, the second average output module 3 averages the traditional steam turbine speed signals in the traditional steam turbine speed signal group to obtain a second speed signal;

[0051] S23, the first condition judgment output module 4 judges the first speed signal and the second speed signal, and outputs the selected speed signal;

[0052] S24, the first weighted summation module 5 performs a subtraction between the speed signal and the rated speed of the machine assembly, and outputs the speed difference;

[0053] S25, converting the speed difference into a corresponding frequency modulation load correction value through the first piecewise function 6;

[0054] S26, obtaining a pressure correction coefficient, and multiplying the frequency modulation load correction amount and the pressure correction coefficient by the first multiplier 7 to obtain a primary frequency modulation frequency correction amount on the DEH side;

[0055] S27, adds the primary frequency modulation frequency correction amount on the DEH side to the comprehensive flow of the turbine high-speed regulating valve to actuate the high-speed regulating valve.

[0056] The above technical solution step S21 may specifically include:

[0057] 1. The first average output module 1 takes the average of all DEH side primary frequency modulation narrow-band signals in the DEH side primary frequency modulation narrow-band signal group; after taking the average, it can be input into the second condition judgment output module 8 together with the DEH side primary frequency modulation broadband signal, and the DEH side primary frequency modulation narrow-band signal after taking the average is output to the first high and low limit output module 9, and the output signal of the first high and low limit output module 9 is used as the judgment condition. If the DEH side primary frequency modulation narrow-band signal is within the threshold range of the second high and 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;

[0058] 2. The DEH side primary frequency modulation narrow-frequency signal after averaging has leading and lagging output module 2 to limit the rate;

[0059] 3. The first coefficient amplification module 10 multiplies the frequency signal output by the lead-lag output module 2 by a coefficient of 60 to convert it into a first speed signal.

[0060] A frequency modulation experiment block can be introduced between step S23 and step S24 of the above technical solution, that is, a third condition judgment output module 11 and a first analog signal transmitter 12 are set, and the analog signal generated by the first analog signal transmitter 12 and the speed signal selected in step S23 are input into the third condition judgment output module 11, and the experimental signal is used as a judgment condition. If there is an experimental signal, the analog signal is output to step S24 to perform a frequency modulation experiment. If there is no experimental signal, the speed signal selected in step S23 is output to step S24 to perform an actual frequency modulation.

[0061] In step S24 of the above technical solution, the rated speed of the machine assembly can be set by the second analog signal transmitter 13 and can be 3000 revolutions.

[0062] After the speed difference is converted into the corresponding frequency modulation load correction value by the first piecewise function 6 in step S25 of the above technical solution, the frequency modulation load correction value can also be amplified by the second coefficient amplification module 14, and the coefficient setting range is -10 to 10, usually 1.

[0063] According to actual needs, the dual-redundant primary frequency regulation method of thermal power generating sets based on homologous control in Example 2 can be further optimized and / or improved:

[0064] As attached Figure 2 As shown, the pressure correction coefficient is obtained in S26, specifically including:

[0065] S261, setting the analog value and the main steam pressure value, and dividing the analog value and the main steam pressure value by the divider 15 to obtain the pressure correction coefficient;

[0066] S262, the third coefficient amplification module 16 is used to set upper and lower limits on 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).

[0067] In step S261 of the above technical solution, the analog value can be generated by the third analog signal transmitter 17, and can be specifically set to 24.2. The main steam pressure value can be set in the range of 1 to 100.

[0068] In step S262 of the above technical solution, the third coefficient amplification module 16 outputs the adjusted pressure correction coefficient, and the pressure correction coefficient can also be conditionally judged by the fourth condition judgment output module 18, that is, the pressure correction coefficient and the analog value "1" generated by the fourth analog signal transmitter 19 are input to the fourth condition judgment output module 18, and the signal of whether the high-precision intelligent transmitter device group is put into use is the judgment condition. If the high-precision intelligent transmitter device group is put into use, the pressure correction coefficient is output, otherwise the analog value "1" is output.

[0069] As attached Figure 2 As shown, in step S23, the first condition judgment output module 4 judges the first speed signal and the second speed signal, which specifically includes:

[0070] S231, obtains the signal of whether the high-precision intelligent transmitter device group is put into use and the comprehensive fault signal of the DEH side system;

[0071] S232, the comprehensive fault signal of the DEH side system is negated by the negation gate 20, and the logic AND operation module 21 performs an AND operation on the negation result and the signal of whether the high-precision intelligent transmitter device group is put into use, and outputs the operation value;

[0072] S233, using the operation value of the logic and operation module 21 as a judgment condition, determining the output of the first condition judgment output module 4, if the operation value is 1, outputting the first speed signal, if the operation value is 0, outputting the second speed signal.

[0073] The signal of whether the above-mentioned high-precision intelligent transmitter device group is put into operation is "0" or "1", and the comprehensive fault signal of the DEH side system is "0" or "1".

[0074] Embodiment 3: As attached Figure 3 As shown, this embodiment also discloses a dual-redundancy primary frequency regulation method for a thermal power generator set based on homologous control. With respect to Embodiment 1, this embodiment further discloses a specific process of obtaining a primary frequency regulation frequency correction amount on the CCS side and superimposing it on the steam turbine master control instruction on the CCS side, specifically including:

[0075] S31, the third average output module 22 takes an average of all CCS-side primary frequency modulation narrow-band signals in the CCS-side primary frequency modulation narrow-band signal group;

[0076] S32, converting the CCS side primary frequency modulation narrow-band signal output after averaging into a speed signal;

[0077] S33, the second weighted summation module 23 performs a subtraction between the speed signal and the rated speed of the machine assembly, and outputs the speed difference;

[0078] S34, converting the speed difference into a corresponding frequency modulation load correction value through the second piecewise function 24;

[0079] S35, obtaining a pressure correction coefficient corresponding to the main steam pressure setting value, and multiplying the frequency modulation load correction amount and the pressure correction coefficient by the second multiplier 25 to obtain a primary frequency modulation frequency correction amount;

[0080] S36, the rate limiting module 26 limits the frequency regulation load correction amount, obtains the primary frequency regulation frequency correction amount on the CCS side, and superimposes it on the steam turbine master control instruction on the CCS side.

[0081] In the above technical solution, step S31 obtains the CCS side primary frequency modulation narrowband signal after averaging, and a fifth condition judgment output module 27 can be introduced to compare and judge the primary frequency modulation narrowband signal with the CCS side primary frequency modulation wideband signal. The process is as follows:

[0082] The third average output module 22 takes the average of all CCS side primary frequency modulation narrow-band signals in the CCS side primary frequency modulation narrow-band signal group; after taking the average, it can be input into the fifth condition judgment output module 27 together with the CCS side primary frequency modulation broadband signal, and the CCS side primary frequency modulation narrow-band signal after taking the average is output to the second high and low limit output module 28, and the output signal of the second high and low limit output module 28 is used as the judgment condition, if the CCS side primary frequency modulation narrow-band signal is within the threshold range of the second high and low limit output module 28, then the CCS side primary frequency modulation broadband signal is output, otherwise the CCS side primary frequency modulation narrow-band signal is output.

[0083] In step S32 of the above technical solution, the CCS side primary frequency modulation narrowband signal output after averaging can be converted into a speed signal by the fourth coefficient amplification module 29, and the coefficient of the fourth coefficient amplification module 29 is 60. In step S33 of the above technical solution, the rated speed of the machine assembly can be generated by the fifth analog signal transmitter 30.

[0084] In step S34 of the above technical solution, after the speed difference is converted into the corresponding frequency modulation load correction value by the second piecewise function 24, a conditional judgment can be introduced to make the frequency modulation load correction value more accurate, as follows:

[0085] 1. Obtain the actual speed difference and convert it into the corresponding frequency modulation load correction value through the third piecewise function 31;

[0086] 2. Introduce the sixth condition judgment output module 32, input the above-mentioned frequency modulation load correction amount and the frequency modulation load correction amount converted by the second piecewise function 24 into the sixth condition judgment output module 32, and use the signal of whether the high-precision intelligent transmitter device group is put into use as the judgment condition. If the high-precision intelligent transmitter device group is put into use, the sixth condition judgment output module 32 outputs the frequency modulation load correction amount converted by the second piecewise function 24, otherwise it outputs the frequency modulation load correction amount converted by the third piecewise function 31.

[0087] In step S35 of the above technical solution, the pressure correction coefficient corresponding to the main steam pressure setting value can be obtained by converting the fourth piecewise function 33.

[0088] In step S36 of the above technical solution, when the primary frequency modulation frequency correction amount is input into the rate limiting module 26, a primary frequency modulation experiment block can be introduced, that is, the seventh condition judgment output module 34 is set to obtain the DEH frequency modulation experimental signal and the primary frequency modulation load, and the primary frequency modulation load and the primary frequency modulation frequency correction amount are input into the seventh condition judgment output module 34, and the DEH frequency modulation experimental signal is used as the judgment condition. If there is an experimental signal, the primary frequency modulation load amount is output to the rate limiting module 26 to perform a primary frequency modulation experiment. Otherwise, the primary frequency modulation frequency correction amount is output to the rate limiting module 26 to perform actual primary frequency modulation.

[0089] According to actual needs, the dual-redundant primary frequency regulation method of thermal power generating sets based on homologous control in Example 3 can be further optimized and / or improved:

[0090] As attached Figure 3 As shown, when the primary frequency regulation frequency correction value on the CCS side is obtained and superimposed on the steam turbine master control instruction on the CCS side, it also includes the judgment of whether the primary frequency regulation is put into use after the unit is started, specifically including:

[0091] S361, setting the sixth analog signal transmitter 35 and the eighth condition judgment output module 36;

[0092] S362, inputting the constant 0 output by the sixth analog signal transmitter 35 and the primary frequency modulation frequency correction value on the CCS side into the eighth condition judgment output module 36;

[0093] S363, takes the signal of whether the primary frequency modulation is put into use as the judgment condition. If the primary frequency modulation is put into use, the primary frequency modulation frequency correction value is output on the CCS side and superimposed on the steam turbine main control instruction on the CCS side. If the primary frequency modulation is not put into use, the constant 0 is output to the steam turbine main control instruction on the CCS side, and the primary frequency modulation is not performed.

[0094] The above technical features constitute the best embodiment of the present invention, which has strong adaptability and best implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A dual redundant primary frequency modulation method for thermal power generating units based on homologous control, characterized in that: include: Obtaining a conventional steam turbine speed signal group and a generator main transformer high-voltage side frequency signal group collected by a high-precision intelligent transmitter device group, wherein the generator main transformer high-voltage side frequency signal group includes 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; Select the best signal from the traditional steam turbine speed signal group and the DEH side primary frequency modulation narrow-band signal group, convert it into a speed signal, obtain the DEH side primary frequency modulation frequency correction amount through the speed signal and the pressure correction coefficient, and add it to the comprehensive flow of the steam turbine high-speed regulating valve to actuate the high-speed regulating valve; Take the average of all CCS-side primary frequency modulation narrow-frequency signals in the CCS-side primary frequency modulation narrow-frequency signal group, and obtain the corresponding speed signal. Obtain the CCS-side primary frequency modulation frequency correction amount through the speed signal and the pressure correction coefficient, and add it to the CCS-side steam turbine master control instruction; Among them, the primary frequency modulation frequency correction value on the DEH side is obtained and superimposed on the comprehensive flow of the turbine high-speed regulating valve to actuate the high-speed regulating valve, specifically including: The first average output module averages all DEH side primary frequency modulation narrow-frequency signals in the DEH side primary frequency modulation narrow-frequency signal group, and converts them into the first speed signal after rate limiting through the lead-lag output module; The second average output module averages the traditional steam turbine speed signals in the traditional steam turbine speed signal group to obtain a second speed signal; The first condition judgment output module judges the first speed signal and the second speed signal and outputs the selected speed signal; The first weighted summation module performs subtraction of the speed signal and the rated speed of the machine assembly, and outputs the speed difference; The speed difference is converted into a corresponding frequency modulation load correction value through a first piecewise function; The pressure correction coefficient is obtained, and the first multiplier multiplies the frequency modulation load correction amount and the pressure correction coefficient to obtain the primary frequency modulation frequency correction amount on the DEH side; The primary frequency modulation frequency correction amount on the DEH side is added to the comprehensive flow of the turbine high-speed regulating valve to actuate the high-speed regulating valve.

2. The method for dual redundant primary frequency modulation of thermal power generating sets based on homologous control according to claim 1 is characterized in that: The obtaining of the pressure correction coefficient specifically includes: Set the analog quantity and the main steam pressure value, and use the divider to divide the analog quantity and the main steam pressure value to obtain the pressure correction coefficient; The pressure correction coefficient is limited to upper and lower limits by the third coefficient amplification module, and the adjusted pressure correction coefficient is output.

3. The method for dual redundant primary frequency modulation of thermal power generating sets based on homologous control according to claim 1 or 2, characterized in that: The first condition judgment output module judges the first speed signal and the second speed signal, specifically including: Obtain the signal of whether the high-precision intelligent transmitter device group is put into use and the comprehensive fault signal of the DEH side system; The comprehensive fault signal of the DEH side system is not operated through the NOT gate, and the logic AND operation module performs AND operation on the NOT operation result and the signal of whether the high-precision intelligent transmitter device group is put into use, and outputs the operation value; The operation value of the logic and operation module is used as a judgment condition to determine the output of the first condition judgment output module. If the operation value is 1, the first speed signal is output; if the operation value is 0, the second speed signal is output.

4. The method for dual redundant primary frequency modulation of thermal power generating sets based on homologous control according to claim 1, 2 or 3, characterized in that: The specific process of obtaining the primary frequency modulation correction value on the CCS side and superimposing it on the steam turbine master control instruction on the CCS side specifically includes: The third average output module takes an average of all CCS-side primary frequency modulation narrow-band signals in the CCS-side primary frequency modulation narrow-band signal group; Convert the CCS side primary frequency modulation narrow-band signal output after averaging into a speed signal; The second weighted summation module performs subtraction between the speed signal and the rated speed of the machine assembly, and outputs the speed difference; The speed difference is converted into a corresponding frequency modulation load correction value through a second piecewise function; The pressure correction coefficient corresponding to the main steam pressure setting value is obtained, and the second multiplier multiplies the frequency modulation load correction amount and the pressure correction coefficient to obtain the primary frequency modulation frequency correction amount; The rate limiting module limits the frequency regulation load correction, obtains the primary frequency regulation frequency correction on the CCS side, and superimposes it on the steam turbine master control instruction on the CCS side.

5. The method for dual redundant primary frequency modulation of thermal power generating sets based on homologous control according to claim 4 is characterized in that: The above also includes the judgment of whether the primary frequency regulation is put into use after the unit is started, specifically including: Setting a sixth analog signal transmitter and an eighth condition judgment output module; Input the constant 0 output by the sixth analog signal transmitter and the primary frequency modulation frequency correction value on the CCS side into the eighth condition judgment output module; The signal indicating whether the primary frequency modulation is put into operation is used as the judgment condition. If the primary frequency modulation is put into operation, the primary frequency modulation frequency correction amount is output on the CCS side and superimposed on the steam turbine main control instruction on the CCS side. If the primary frequency modulation is not put into operation, the constant 0 is output to the steam turbine main control instruction on the CCS side, and the primary frequency modulation is not performed.

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