CN114928119A - Primary frequency modulation control method considering dynamic frequency modulation amplitude and integral electric quantity of power grid - Google Patents
Primary frequency modulation control method considering dynamic frequency modulation amplitude and integral electric quantity of power grid Download PDFInfo
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- H—ELECTRICITY
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- H—ELECTRICITY
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Abstract
The invention discloses a primary frequency modulation control method considering dynamic frequency modulation amplitude and integral electric quantity of a power grid, belonging to the technical field of frequency modulation of a thermal power generating unit of the power grid. The speed and the endurance capacity of the response primary frequency modulation of the unit are obviously improved before and after the optimization of the control strategy, so that the purpose of improving the primary frequency modulation performance index of the unit is achieved, and the safety of a power grid and the unit is ensured.
Description
Technical Field
The invention relates to the technical field of frequency modulation of a power grid thermal power generating unit, in particular to a primary frequency modulation control method for calculating dynamic frequency modulation amplitude and integral electric quantity of a power grid.
Background
With the progress of the construction of a novel electric power system, the new energy installed ratio gradually rises, the thermal power generating unit ratio gradually falls, the power supply structure of the electric power system is changed greatly, the uncertainty of the operation of a power grid is increased, and the importance of the thermal power generating unit is particularly outstanding. In order to ensure safe and economic operation of a power grid, improve the control level of the power quality and the power grid frequency and quickly eliminate frequency fluctuation caused by load change of the power grid, the requirement of the power grid on primary frequency modulation of a thermal power generating unit is higher and higher, and the examination is stricter and stricter.
The evaluation indexes of the 'two detailed rules' of the power grid on the primary frequency modulation of the thermal power generating unit mainly adopt an evaluation method of dynamic frequency modulation amplitude and 'integral electric quantity'. However, the primary frequency modulation characteristics of the internal combustion engine sets in the power grid are uneven, and the contribution rate of the unit frequency modulation contribution is low in the primary frequency modulation process, so that the load response capability of the power grid is seriously influenced. The low primary frequency modulation performance has a direct relation with the imperfect primary frequency modulation control strategy of the thermal power generating unit. The existing control strategy is simple, the corresponding capacity of the primary frequency modulation of the unit when the unit operates at different loads is not fully considered, the steam turbine valve regulation control instruction or the unit instruction is corrected only according to the actual rotating speed of the steam turbine and the current frequency modulation instruction obtained through the static function operation of the rotating speed-frequency modulation, the control strategy is a simple comparison type, and the primary frequency modulation control strategy is suitable for the rated operation condition of the unit. However, under a normal operation mode, the unit is usually in a sliding pressure operation mode due to the consideration of thermal economy, actual operation parameters are low, and a frequency modulation instruction of primary frequency modulation under rated parameters cannot meet frequency modulation requirements under various working conditions, so that the primary frequency modulation action amplitude is small, and the contribution electric quantity is low. Some units increase correction coefficients for the frequency modulation amount, and although the problem of deviation of the primary frequency modulation amplitude and an actual value under a certain working condition or some working conditions can be solved through the correction coefficients, the unit is difficult to ensure the primary frequency modulation requirement under each working condition due to poor valve flow characteristics, the influence of operation parameters, and the randomness and unpredictability of the frequency change of the power grid.
Disclosure of Invention
The invention aims to solve the problems of insufficient primary frequency modulation amplitude and integral electric quantity and low contribution rate of the existing thermal power generating units, and improve the primary frequency modulation qualified rate, and provides a primary frequency modulation control method considering the dynamic frequency modulation amplitude and the integral electric quantity of a power grid.
In order to achieve the purpose, the invention adopts the following technical scheme: a primary frequency modulation control method considering dynamic frequency modulation amplitude and integral electric quantity of a power grid is characterized by comprising the following steps:
step 1: the frequency modulation instruction signal passes through a first high-low limit judgment module to generate a primary frequency modulation action signal of the unit, and the primary frequency modulation action signal passes through a timer module to generate primary frequency modulation action time; after the primary frequency modulation action time passes through the function module, outputting a first correction coefficient of a frequency modulation instruction;
inputting the acquired theoretical integral electric quantity signal and the actual integral electric quantity signal into a first divider, generating an integral electric quantity adjusting factor after the signals are processed by the first divider, inputting the integral electric quantity adjusting factor and a constant a into a first switch module, and generating a second correction coefficient of a frequency modulation quantity instruction after the signals are processed by the first switch module, wherein the value of the constant a is 1;
step 2: after the frequency modulation instruction signal, the first correction coefficient and the second correction coefficient in the step 1 are simultaneously sent to a multiplier module, the frequency modulation instruction signal is corrected by the first correction coefficient and the second correction coefficient to generate a corrected frequency modulation instruction, and the corrected frequency modulation instruction is sent to a DEH (digital output) to be used as a dynamic feedforward for compensation, so that primary frequency modulation control is completed;
in step 1, an output signal of the primary frequency modulation action time after passing through the delay module is used as a switching condition of the first switch module, the delay time is set to 15s, namely within 15 seconds of the primary frequency modulation action, the first switch module selects the N end as an input end of the first switch module, a correction coefficient two is constant 1 at the moment, namely the integral electric quantity does not participate in correction and adjustment in the period, the frequency modulation of the unit is mainly based on the correction coefficient one, and the frequency modulation amplitude of the unit is mainly improved; after the primary frequency modulation action is carried out for 15 seconds, the first switcher module selects the Y end as the input end of the first switcher module, the second correction coefficient is the ratio of the theoretical integral electric quantity to the actual integral electric quantity, namely the integral electric quantity participates in correction and adjustment in the period, and the unit frequency modulation is mainly based on the second correction coefficient so as to ensure that the integral electric quantity of the unit meets the requirement of a power grid.
Further, the integrated electric quantity adjustment factor is a theoretical integrated electric quantity divided by an actual integrated electric quantity.
Further, the correction coefficient two selects an integral electric quantity adjustment factor or a constant a through primary frequency modulation action time, when the primary frequency modulation action does not exceed 15s, the correction coefficient two selects the constant a, and a is 1, that is, the value of the correction coefficient two is 1, and the correction coefficient two does not correct the frequency modulation command; when the primary frequency modulation action exceeds 15s, the second correction coefficient selects an integral electric quantity adjusting factor, namely the numerical value of the second correction coefficient is the ratio of the theoretical integral electric quantity to the actual integral electric quantity, so as to ensure that the integral electric quantity of the unit meets the requirement of a power grid.
Further, the frequency modulation instruction signal, the first correction coefficient and the second correction coefficient are input into a multiplier module, and multiplication operation is carried out on the three to obtain a modified frequency modulation instruction.
Further, the process of acquiring the theoretical integral electric quantity is as follows:
dividing the frequency modulation instruction into two paths, wherein one path is transmitted to an inertia module, and the frequency modulation instruction is output as the expected load variation of the power grid through the inertia module; the time constant of the inertia module is 6s, and the variable quantity of the expected load of the power grid and a constant b are simultaneously transmitted to a second divider, wherein the constant b is the number of scanning periods in the DCS controller 1s, and the output of the second divider is the expected load of the power grid in each scanning period;
the other path of the frequency modulation command is transmitted to a second high-low limit judgment module, the signal output by the second high-low limit judgment module is a primary frequency modulation action signal, the primary frequency modulation action signal and the signal after the primary frequency modulation action signal passes through a first pulse module are simultaneously transmitted to a first AND module, the output of the first AND module is a signal for triggering power grid assessment indexes to integrate the primary frequency modulation assessment action signal, namely, the power grid frequency change exceeds a primary frequency modulation dead zone and lasts for 60s or the frequency returns to the range of the primary frequency modulation dead zone, and the time of the first pulse module is set to be 60 s; the primary frequency modulation checking action signal is respectively sent to the second switcher module and the third switcher module, when the signal is 1, the second switcher module and the third switcher module select Y input, and when the signal is 0, the second switcher module and the third switcher module select N input; the third switcher module is used for keeping the theoretical integral electric quantity of the previous primary frequency modulation action when the primary frequency modulation action is finished;
the output of the second divider and the output of the second switcher module are transmitted to the first adder module together to realize integral operation of expected load of the power grid through accumulation, and the output end of the first adder module is connected with the Y end of the second switcher module.
Further, the actual integrated electric quantity is obtained as follows:
after passing through a sixth switching module, the unit load signal and the unit load signal are sent to a subtracter, when primary frequency modulation acts, the sixth switching module is used for recording the load before the primary frequency modulation acts, and the subtracter is used for generating the actual frequency modulation amount of the unit; the actual frequency modulation quantity of the unit and the number of scanning periods in the DCS controller 1s are transmitted to a third divider together, and the actual frequency modulation quantity of the unit in each scanning period is output after passing through the third divider;
the frequency modulation instruction is transmitted to a third high-low limit judgment module, a signal of the frequency modulation instruction, which is output by the third high-low limit judgment module, is a primary frequency modulation action signal, the primary frequency modulation action signal and a signal after the primary frequency modulation action signal passes through a second pulse module are simultaneously transmitted to a second AND module, the output of the second AND module is a primary frequency modulation examination action signal for triggering a power grid examination index integral electric quantity to start integral, namely, the power grid frequency change exceeds a primary frequency modulation dead zone and lasts for 60s or the frequency returns to the range within the primary frequency modulation dead zone, wherein the time of the second pulse module is set to be 60 s; the first-order frequency modulation checking action signal is respectively sent to the fourth switcher module and the fifth switcher module, when the signal is 1, the fourth switcher module and the fifth switcher module select Y input, and when the signal is 0, the fourth switcher module and the fifth switcher module select N input; the fifth switcher module is used for keeping the actual integral electric quantity of the previous primary frequency modulation action when the primary frequency modulation action is finished;
the output of the third divider and the output of the fourth switcher module are transmitted to the second adder module together to realize integral operation of the actual frequency modulation amount of the unit through accumulation, and the output end of the second adder module is connected with the Y end of the fourth switcher module.
Through the design scheme, the invention can bring the following beneficial effects: the traditional primary frequency modulation control strategy of the thermal power generating unit does not fully consider the corresponding primary frequency modulation capacity of the thermal power generating unit when the unit operates at different loads, and the requirement of a power grid on the frequency modulation characteristic of the thermal power generating unit under a novel power system cannot be met. The primary frequency modulation control method considering the dynamic frequency modulation amplitude and the integral electric quantity of the power grid, namely the primary frequency modulation control method based on two fine rule assessment indexes of the power grid, provided by the invention, is used for doubly correcting two performance indexes of rapidity and persistence of the primary frequency modulation of a thermal power generating unit by the power grid according to a time scale, and overcoming the problems of the unit caused by poor flow characteristic of a DEH valve, the influence of unit operation parameters and lifting loads on the primary frequency modulation and the like, so that the frequency modulation capability of the unit in different load operations can meet the frequency modulation requirement of the power grid on the thermal power generating unit. The speed and the endurance capacity of the response primary frequency modulation of the unit are obviously improved before and after the optimization of the control strategy, so that the purpose of improving the primary frequency modulation performance index of the unit is achieved, and the safety of a power grid and the unit is ensured.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limitation and are not intended to limit the invention in any way, and in which:
fig. 1 is a control logic diagram of a primary frequency modulation control method taking into account dynamic frequency modulation amplitude and integral electric quantity of a power grid;
FIG. 2 is a logic diagram of theoretical integrated power implementation;
fig. 3 is a logic diagram of actual integrated electric quantity implementation.
In the figure: 1-a first high-low limit judgment module; 2-a timer module; 3-a function module; 4-a first divider; 5-a first switch module; 6-a multiplier module; 7-a delay module; 8-an inertial module; 9-a second divider; 10-a second high-low limit judgment module; 11-a first pulse module; 12-first and module; 13-a second switch module; 14-a third switch module; 15-a first adder module; 16-a third high-low limit judgment module; 17-a second pulse module; 18-second and module; 19-a fourth switch module; 20-a fifth switch module; 21-a second adder module; 22-a sixth switch module; 23-a subtractor; 24-third divider.
The same reference numbers in all figures indicate similar or corresponding features or functions.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the present invention are clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the present invention is not limited by the following examples, and specific embodiments can be determined according to the technical solutions and practical situations of the present invention. Well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention.
In the primary frequency modulation action process, the power grid has two assessment indexes on the primary frequency modulation action indexes according to the time scale, one of the two assessment indexes is that the primary frequency modulation action is earlier, the unit primary frequency modulation is required to be capable of rapidly acting, the load adjustment amplitude in 15s is required to reach 90% of the load adjustment theoretical primary frequency modulation theory corresponding to the frequency extreme point in 15s, and the rapidity and the frequency modulation amplitude of the unit primary frequency modulation are assessed. And the other is that during the whole primary frequency modulation action, the actual integral electric quantity of the primary frequency modulation of the unit is required to reach over 90 percent of the expected integral electric quantity, and the primary frequency modulation endurance is mainly emphasized.
A primary frequency modulation control method based on two fine rule assessment indexes of a power grid is formulated based on the assessment mode, namely, the primary frequency modulation quantity instruction on the DEH side is compensated by time-interval action quantity, in 15s of primary frequency modulation action, the frequency modulation coefficient is increased to enable the requirement of the assessment indexes of the two fine rules on response time and frequency modulation amplitude to be achieved, after the primary frequency modulation action is carried out for 15s, the primary frequency modulation action quantity is corrected through the ratio of theoretical integral electric quantity and actual integral electric quantity, and the requirement of the two fine rules on durability of the primary frequency modulation is guaranteed to be met.
Among them, DEH is a digital electro-hydraulic control system of a steam turbine, called digital electric tuning for short, and is an important component of DCS.
The control logic of a primary frequency modulation control method (i.e. a primary frequency modulation control method taking the dynamic frequency modulation amplitude and the integral electric quantity of the power grid into account) based on the evaluation indexes of 'two detailed rules' of the power grid is shown in fig. 1.
(1) Frequency modulated instruction optimization logic
And after the frequency modulation instruction signal is corrected by the first correction coefficient and the second correction coefficient, generating a corrected frequency modulation instruction, and sending the corrected frequency modulation instruction to the DEH to be used as dynamic feedforward for compensation. One side of the correction coefficient emphasizes the response of the speed of the primary frequency modulation of the unit, and the other side of the correction coefficient emphasizes the endurance capacity of the primary frequency modulation of the unit.
Frequency modulation instruction optimization logic:
as shown in fig. 1, after a frequency modulation instruction passes through a first high-low limit judgment module 1, a primary frequency modulation action signal of the unit is generated, the high-low limit action limit is greater than zero or less than zero, and after the primary frequency modulation action signal passes through a timer module 2, a primary frequency modulation action time is generated. And after the primary frequency modulation action time passes through the function module 3, outputting a first correction coefficient of the frequency modulation instruction. Primary frequency modulation action time coefficient function:
TABLE 1 relationship function of primary frequency modulation action time and correction coefficient
The theoretical integral electric quantity signal and the actual integral electric quantity signal pass through the first divider 4 to generate an integral electric quantity adjusting factor, and the integral electric quantity adjusting factor is the theoretical integral electric quantity divided by the actual integral electric quantity. The integral electric quantity adjusting factor and the constant a are sent to the first switcher module 5, the value of the constant a is 1, and the first switcher module 5 generates and outputs a second correction coefficient. The output signal of the time delay module 7 after the primary frequency modulation action time is used as the switching condition of the first switch module 5, the time delay is set to 15s, namely the unit frequency modulation is mainly performed within 15 seconds of the primary frequency modulation action, so that the unit frequency modulation amplitude is mainly improved, and the unit integral electric quantity is mainly ensured after the primary frequency modulation action is performed for 15 seconds. After the frequency modulation command, the first correction coefficient and the second correction coefficient are simultaneously sent to the multiplier module 6, the multiplier module 6 outputs the modified frequency modulation command.
(2) Theoretical integral electric quantity realizing logic
The theoretical integral electric quantity is an integral value of the change of the primary frequency modulation expected load after the change of the power grid frequency exceeds the dead zone of the unit and lasts for 60s from the time when the change of the power grid frequency exceeds the primary frequency modulation dead zone or until the frequency returns to the time within the primary frequency modulation dead zone.
As shown in fig. 2, the frequency modulation instruction is divided into two paths, one path is transmitted to the inertia module 8, and the frequency modulation instruction is output as the expected load variation of the power grid through the inertia module 8; the time constant of the inertia module 8 is 6s, and the variation quantity of the expected load of the power grid and a constant b are simultaneously transmitted to the second divider 9, wherein the constant b is the number of scanning periods in the DCS controller 1s, and the output of the second divider 9 is the expected load of the power grid in each scanning period;
the other path is transmitted to a second high-low limit judgment module 10, a signal of a frequency modulation instruction output by the second high-low limit judgment module 10 is a primary frequency modulation action signal, the primary frequency modulation action signal and a signal after the primary frequency modulation action signal passes through a first pulse module 11 are simultaneously transmitted to a first AND module 12, the output of the first AND module 12 is a primary frequency modulation examination action signal for triggering power grid examination index integral electric quantity to start integral, namely, the power grid frequency change exceeds a primary frequency modulation dead zone and lasts for 60s or the frequency returns to the range within the primary frequency modulation dead zone, wherein the time of the first pulse module 11 is set to be 60 s; the primary frequency modulation checking action signal is respectively sent to the second switcher module 13 and the third switcher module 14, when the signal is 1, the second switcher module 13 and the third switcher module 14 select Y input, and when the signal is 0, the second switcher module 13 and the third switcher module 14 select N input; the third switcher module 14 is configured to keep the theoretical integrated electric quantity of the previous primary frequency modulation action when the primary frequency modulation action is finished;
the output of the second divider 9 and the output of the second switch module 13 are both transmitted to the first adder module 15 for implementing the integral operation on the expected load of the power grid by accumulation, and the output end of the first adder module 15 is connected to the Y-end of the second switch module 13.
(3) Actual integrated power implementation logic
The actual integral electric quantity refers to an integral value of the primary frequency modulation actual frequency modulation quantity after the grid frequency changes and exceeds the dead zone of the unit, and the integral value lasts for 60 seconds from the time when the grid frequency changes and exceeds the primary frequency modulation dead zone or until the frequency returns to the time within the primary frequency modulation dead zone.
As shown in fig. 3, after passing through the sixth switching module 22, the unit load signal is sent to the subtracter 23 together with the unit load signal, and when the unit load signal is subjected to the primary frequency modulation action, the sixth switching module 22 is used for recording the load before the primary frequency modulation action when the unit load signal is subjected to the primary frequency modulation action, and the subtracter 17 is used for producing the actual frequency modulation amount of the unit load signal. The constant b is the number of scanning periods in the DCS controller 1s, and the actual frequency modulation amount of the unit and the constant b (the constant b is the number of scanning periods in the CS controller 1 s) are output as the actual frequency modulation amount of the unit in each scanning period through the third divider 24.
The frequency modulation instruction is transmitted to a third high-low limit judgment module 16, the signal of the frequency modulation instruction output by the third high-low limit judgment module 16 is a primary frequency modulation action signal, the primary frequency modulation action signal and the signal after the primary frequency modulation action signal passes through a second pulse module 17 are simultaneously transmitted to a second AND module 18, the output of the second AND module 18 is a signal for triggering the power grid examination index integral electric quantity to start integral primary frequency modulation examination action, namely, the power grid frequency change exceeds a primary frequency modulation dead zone and lasts for 60s or the frequency returns to the range within the primary frequency modulation dead zone, wherein the time of the second pulse module 17 is set to 60 s; the primary frequency modulation checking action signal is respectively sent to the fourth switcher module 19 and the fifth switcher module 20, when the signal is 1, the fourth switcher module 19 and the fifth switcher module 20 select the Y input, and when the signal is 0, the fourth switcher module 19 and the fifth switcher module 20 select the N input; the fifth switcher module 20 is configured to implement that when the primary frequency modulation action is finished, the actual integrated electric quantity of the previous primary frequency modulation action is kept;
the output of the third divider 24 and the output of the fourth switch module 19 are together transmitted to the second adder module 21, and the integration operation on the actual frequency modulation amount of the unit is realized through accumulation, and the output end of the second adder module 21 is connected to the Y end of the fourth switch module 19.
The Y-side input of the second switch module 13 is: and (3) theoretically integrating the electric quantity in the primary frequency modulation effective action time (the change of the power grid frequency exceeds the primary frequency modulation dead zone and lasts for 60s or the frequency returns to the range within the primary frequency modulation dead zone), accumulating the electric quantity in each sampling period in the effective action time, and calculating the sampling value of each period according to 0 when the change of the power grid frequency exceeds the primary frequency modulation effective action time.
The N-side inputs of the second switch module 13 are: a constant of 0.
The Y-side input of the third switch module 14 is: the theoretical integrated electrical quantity.
The N-side inputs of the third switch module 14 are: when the primary frequency modulation is not effectively operated, the output of the switcher keeps the last time output value.
The Y-side input of the fourth switch module 19 is: and accumulating the electric quantity of each sampling period in the effective action time, and calculating the sampling value of each period according to 0 when the electric quantity exceeds the effective action time of the primary frequency modulation.
The N-side inputs of the fourth switch module 19 are: a constant of 0.
The Y-side input of the fifth switch module 20 is: the actual integrated electrical quantity.
The N-side inputs of the fifth switch module 20 are: when the primary frequency modulation is not effectively operated, the output of the switcher keeps the last time output value.
The first high-low limit judging module 1, the timer module 2, the function module 3, the first divider 4, the first switcher module 5, the multiplier module 6, the delay module 7, the inertia module 8, the second divider 9, the second high-low limit judging module 10, the first pulse module 11, the first and module 12, the second switcher module 13, the third switcher module 14, the first adder module 15, the third high-low limit judging module 16, the second pulse module 17, the second and module 18, the fourth switcher module 19, the fifth switcher module 20, the second adder module 21, the sixth switcher module 22, the subtracter 23 and the third divider 24 all belong to common parts in an electric power system, and the method provided by the invention organically integrates and integrates the above devices or modules into a whole, and needs to be emphasized that the devices or modules are in terms of monomers, specific structures for realizing the functions to be realized by each are already existed in the prior art, and the protocols, software or programs involved in the work processing of each device and/or module are also existed in the prior art and are well known by those skilled in the art.
Claims (6)
1. A primary frequency modulation control method for calculating dynamic frequency modulation amplitude and integral electric quantity of a power grid is characterized by comprising the following steps:
step 1: the frequency modulation instruction signal passes through a first high-low limit judgment module (1) to generate a primary frequency modulation action signal of the unit, and the primary frequency modulation action signal passes through a timer module (2) to generate primary frequency modulation action time; after the primary frequency modulation action time passes through the function module (3), outputting a first correction coefficient of a frequency modulation instruction;
inputting the acquired theoretical integral electric quantity signal and the actual integral electric quantity signal into a first divider (4), generating an integral electric quantity adjusting factor after the signals are processed by the first divider (4), inputting the integral electric quantity adjusting factor and a constant a into a first switcher module (5), and generating a second correction coefficient of a frequency modulation quantity instruction after the signals are processed by the first switcher module (5), wherein the value of the constant a is 1;
and 2, step: after the frequency modulation instruction signal, the first correction coefficient and the second correction coefficient in the step 1 are simultaneously sent to a multiplier module (6), the frequency modulation instruction signal is corrected by the first correction coefficient and the second correction coefficient to generate a corrected frequency modulation instruction, and the corrected frequency modulation instruction is sent to a DEH (digital output) to be used as a dynamic feedforward for compensation, so that primary frequency modulation control is completed;
in the step 1, an output signal of the primary frequency modulation action time after passing through the delay module (7) is used as a switching condition of the first switch module (5), the delay time is set to 15s, namely within 15 seconds of the primary frequency modulation action, the first switch module (5) selects an N end as an input end thereof, and at this time, a second correction coefficient is a constant 1; after 15 seconds of primary frequency modulation action, the first switcher module (5) selects the Y end as the input end, and the second correction coefficient is the ratio of the theoretical integral electric quantity to the actual integral electric quantity.
2. The primary frequency modulation control method taking into account the dynamic frequency modulation amplitude and the integrated electric quantity of the power grid as claimed in claim 1, wherein: the integrated electric quantity adjustment factor is a theoretical integrated electric quantity divided by an actual integrated electric quantity.
3. The primary frequency modulation control method considering the dynamic frequency modulation amplitude and the integral electric quantity of the power grid according to claim 1, is characterized in that: the correction coefficient two selects an integral electric quantity adjusting factor or a constant a through primary frequency modulation action time, when the primary frequency modulation action does not exceed 15s, the correction coefficient two selects the constant a, and a is 1, namely the value of the correction coefficient two is 1, and the correction coefficient two does not correct the frequency modulation command; when the primary frequency modulation action exceeds 15s, the second correction coefficient selects an integral electric quantity adjusting factor, namely the numerical value of the second correction coefficient is the ratio of the theoretical integral electric quantity to the actual integral electric quantity.
4. The primary frequency modulation control method taking into account the dynamic frequency modulation amplitude and the integrated electric quantity of the power grid as claimed in claim 1, wherein: and the frequency modulation instruction signal, the correction coefficient I and the correction coefficient II are input into a multiplier module, and multiplication operation is carried out on the three to obtain a modified frequency modulation instruction.
5. The primary frequency modulation control method considering the dynamic frequency modulation amplitude and the integral electric quantity of the power grid according to claim 1, is characterized in that: the process of acquiring the theoretical integral electric quantity is as follows:
dividing the frequency modulation instruction into two paths, wherein one path is transmitted to the inertia module (8), and the frequency modulation instruction is output as the expected load variation of the power grid through the inertia module (8); the time constant of the inertia module (8) is 6s, and the variation of the expected load of the power grid and a constant b are simultaneously transmitted to a second divider (9), wherein the constant b is the number of scanning periods in the DCS controller 1s, and the output of the second divider (9) is the expected load of the power grid in each scanning period;
the other path of the frequency modulation instruction is transmitted to a second high-low limit judgment module (10), a signal output by the second high-low limit judgment module (10) is a primary frequency modulation action signal, the primary frequency modulation action signal and a signal passing through a first pulse module (11) are simultaneously transmitted to a first AND module (12), the output of the first AND module (12) is a primary frequency modulation examination action signal for triggering a power grid examination index integral electric quantity to start integral, namely, the power grid frequency change exceeds a primary frequency modulation dead zone and lasts for 60s or until the frequency returns to the range of the primary frequency modulation dead zone, wherein the time of the first pulse module (11) is set to be 60 s; the primary frequency modulation checking action signal is respectively sent to the second switcher module (13) and the third switcher module (14), when the signal is 1, the second switcher module (13) and the third switcher module (14) select Y input, when the signal is 0, the second switcher module (13) and the third switcher module (14) select N input; the third switcher module (14) is used for keeping the theoretical integral electric quantity of the previous primary frequency modulation action when the primary frequency modulation action is finished;
the output of the second divider (9) and the output of the second switcher module (13) are transmitted to the first adder module (15) together to realize integral operation of expected load of the power grid through accumulation, and the output end of the first adder module (15) is connected with the Y end of the second switcher module (13).
6. The primary frequency modulation control method taking into account the dynamic frequency modulation amplitude and the integrated electric quantity of the power grid as claimed in claim 1, wherein: the actual integral electric quantity is obtained as follows:
after passing through a sixth switching module (22), the unit load signal and the unit load signal are sent to a subtracter (23), when primary frequency modulation acts, the sixth switching module (22) is used for recording the load before the primary frequency modulation acts, and the subtracter (23) is used for generating the actual frequency modulation quantity of the unit; the actual frequency modulation quantity of the unit and the number of scanning periods in the DCS controller 1s are transmitted to a third divider (24) together, and the actual frequency modulation quantity of the unit in each scanning period is output after passing through the third divider (24);
the frequency modulation instruction is transmitted to a third high-low limit judgment module (16), a signal of the frequency modulation instruction, which is output by the third high-low limit judgment module (16), is a primary frequency modulation action signal, the primary frequency modulation action signal and a signal of the frequency modulation instruction, which passes through a second pulse module (17), are simultaneously transmitted to a second AND module (18), the output of the second AND module (18) is a primary frequency modulation examination action signal for triggering the power grid examination index integral electric quantity to start integral, namely, the power grid frequency change exceeds a primary frequency modulation dead zone and lasts for 60s or until the frequency returns to the range of the primary frequency modulation dead zone, wherein the time of the second pulse module (17) is set to be 60 s; the primary frequency modulation checking action signal is respectively sent to a fourth switcher module (19) and a fifth switcher module (20), when the signal is 1, the fourth switcher module (19) and the fifth switcher module (20) select Y input, and when the signal is 0, the fourth switcher module (19) and the fifth switcher module (20) select N input; the fifth switcher module (20) is used for keeping the actual integral electric quantity of the previous primary frequency modulation action when the primary frequency modulation action is finished;
the output of the third divider (24) and the output of the fourth switcher module (19) are transmitted to the second adder module (21) together to realize the integral operation of the actual frequency modulation amount of the unit through accumulation, and the output end of the second adder module (21) is connected with the Y end of the fourth switcher module (19).
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