CN114928119B - 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
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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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, and belongs to the technical field of frequency modulation of thermal power units of the power grid. The speed and durability of the unit in response to primary frequency modulation before and after the control strategy optimization are obviously improved, so that the purpose of improving the unit primary frequency modulation performance index 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 power grid thermal power generating units, in particular to a primary frequency modulation control method considering dynamic frequency modulation amplitude and integral electric quantity of a power grid.
Background
With the promotion of the novel power system construction progress, the new energy installation duty ratio gradually rises, the thermal power unit duty ratio gradually falls, the power supply structure of the power system is changed greatly, the uncertainty of the power grid operation is increased, and the importance of the thermal power unit is particularly outstanding. In order to ensure safe and economical operation of a power grid, improve the control level of the power quality and the power grid frequency, quickly eliminate frequency fluctuation caused by power grid load change, the primary frequency modulation requirement of the power grid on a thermal power generating unit is higher and higher, and the assessment is also stricter and stricter.
The check indexes of the power grid 'two rules' for primary frequency modulation of the thermal power generating unit mainly adopt a check method of dynamic frequency modulation amplitude and 'integral electric quantity'. However, primary frequency modulation characteristics of thermal power generating units in the power grid are uneven, and in the primary frequency modulation process, the contribution rate of the unit frequency modulation contribution quantity is low, so that the load response capability of the power grid is seriously affected. The low primary frequency modulation performance has a direct relation with the imperfection of a primary frequency modulation control strategy of the thermal power generating unit. The existing control strategy is simpler, the corresponding capability of the unit for primary frequency modulation at different load operation occasions is not fully considered, the control instruction of the steam turbine door regulating or the unit instruction is corrected only according to the actual speed of the steam turbine and the current frequency modulation amount instruction obtained through the static function operation of the speed-frequency modulation amount, and the control strategy is simple comparison type, and is suitable for the rated operation working condition of the unit. However, in 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, a primary frequency modulation quantity instruction of primary frequency modulation under rated parameters cannot meet the frequency modulation requirements under various working conditions, and therefore primary frequency modulation action amplitude is small, and contribution electric quantity is low. Some units add a correction coefficient to the frequency modulation quantity, and although the problem of deviation between the primary frequency modulation amplitude and the actual value under certain or certain working conditions can be solved through the correction coefficient, the units are difficult to ensure the primary frequency modulation requirement under each working condition due to poor valve flow characteristics and influence of operating parameters, randomness and unpredictability of power grid frequency change.
Disclosure of Invention
The invention aims to solve the problems of insufficient primary frequency modulation amplitude and integral electric quantity and low contribution rate existing in the conventional thermal power generating unit, and improve the primary frequency modulation qualification 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 above 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: generating a primary frequency modulation action signal of the unit after the frequency modulation quantity instruction signal passes through the first high-low limit judging module, and generating primary frequency modulation action time after the primary frequency modulation action signal passes through the timer module; outputting a correction coefficient I of the frequency modulation quantity instruction after the primary frequency modulation action time passes through the function module;
inputting the obtained theoretical integrated electric quantity signal and the actual integrated electric quantity signal into a first divider, processing the theoretical integrated electric quantity signal and the actual integrated electric quantity signal by the first divider to generate an integrated electric quantity regulating factor, inputting the integrated electric quantity regulating factor and a constant a into a first switcher module, and processing the integrated electric quantity regulating factor and the constant a by the first switcher module to generate a correction coefficient II of a frequency modulation command, wherein the value of the constant a is 1;
Step 2: after simultaneously sending the frequency modulation quantity command signal, the first correction coefficient and the second correction coefficient in the step 1 to a multiplier module, generating a corrected frequency modulation quantity command after the frequency modulation quantity command signal is corrected by the first correction coefficient and the second correction coefficient, and sending the corrected frequency modulation quantity command to the DEH as dynamic feedforward to compensate, so as to finish primary frequency modulation control;
In step 1, the output signal of the primary frequency modulation action time after passing through the delay module is used as a switching condition of the first switcher module, the delay time is set to 15s, namely, the primary frequency modulation action is performed for 15 seconds, the first switcher module selects an N end as an input end of the primary frequency modulation action, at the moment, a correction coefficient II is a constant 1, namely, the integral electric quantity does not participate in correction adjustment during the period, the frequency modulation of the unit is mainly the correction coefficient I, and the frequency modulation amplitude of the unit is mainly improved; after 15 seconds of primary frequency modulation action, the first switcher module selects the Y end as an input end of the Y end, and the correction coefficient II is the ratio of the theoretical integral electric quantity to the actual integral electric quantity at the moment, namely the integral electric quantity participates in correction adjustment during the period, and the unit frequency modulation is mainly based on the correction coefficient II so as to ensure that the unit integral electric quantity meets the power grid requirement.
Further, the integrated charge amount adjustment factor is a theoretical integrated charge amount divided by an actual integrated charge amount.
Further, the correction coefficient II selects whether the integrated electric quantity adjustment factor or the constant a through primary frequency modulation action time, when the primary frequency modulation action is not more than 15s, the correction coefficient II selects the constant a, a=1, namely, when the correction coefficient II is 1, the correction coefficient II does not correct the frequency modulation quantity instruction; when the primary frequency modulation action exceeds 15s, the correction coefficient II selects an integral electric quantity adjusting factor, namely, the value of the correction coefficient II is the ratio of the theoretical integral electric quantity to the actual integral electric quantity at the moment, so that the integral electric quantity of the unit meets the power grid requirement.
Further, the frequency modulation quantity 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 frequency modulation quantity instruction signal, the first correction coefficient and the second correction coefficient to obtain a corrected frequency modulation quantity instruction.
Further, the theoretical integrated electric quantity is obtained as follows:
Dividing the frequency modulation quantity instruction into two paths, wherein one path is transmitted to the inertia module, and the frequency modulation quantity 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, the expected load variation 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 signals is transmitted to a second high-low limit judging module, signals output by the second high-low limit judging module of the frequency modulation quantity instruction are primary frequency modulation action signals, the primary frequency modulation action signals and signals which pass through the first pulse module are simultaneously transmitted to a first AND module, the output of the first AND module is the primary frequency modulation check action signals which trigger the integral electric quantity of the power grid check index to start to integrate, namely the power grid frequency change exceeds a primary frequency modulation dead zone to start to last for 60 seconds or until the frequency returns to the primary frequency modulation dead zone, wherein the time of the first pulse module is set to be 60 seconds; 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 last 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, integral operation on expected load of the power grid is achieved through accumulation, and the output end of the first adder module is connected with the Y end of the second switcher module.
Further, the process of obtaining the actual integrated electric quantity is as follows:
After passing through the sixth switching module, the unit load signal and the unit load signal are sent to a subtracter, and when the primary frequency modulation action is performed, the sixth switching module is used for recording the load before the primary frequency modulation action, and the subtracter 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, and the actual frequency modulation quantity of the unit in each scanning period is output through the third divider;
The frequency modulation quantity instruction is transmitted to a third high-low limit judging module, a signal output by the third high-low limit judging module of the frequency modulation quantity instruction is a primary frequency modulation action signal, the primary frequency modulation action signal and a signal which passes through a second pulse module are simultaneously transmitted to a second AND module, the output of the second AND module is an integral primary frequency modulation check action signal which triggers the integral electric quantity of the power grid check index, namely the power grid frequency change exceeds a primary frequency modulation dead zone and starts to last for 60 seconds or until the frequency returns to the primary frequency modulation dead zone, wherein the time of the second pulse module is set to be 60 seconds; the primary frequency modulation checking action signals are respectively sent to a fourth switcher module and a fifth switcher module, when the signals are 1, the fourth switcher module and the fifth switcher module select Y input, and when the signals are 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 last 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, integral operation on the actual frequency modulation quantity of the unit is achieved 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 has the following beneficial effects: the traditional primary frequency modulation control strategy of the thermal power generating unit does not fully consider the corresponding capability of primary frequency modulation of the unit in different load operation occasions, and the frequency modulation characteristic requirement of a power grid on 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, which is provided by the invention, is a primary frequency modulation control method based on the evaluation index of the two rules of the power grid, and aims at double correction of the two performance indexes of the rapidity and the durability of the primary frequency modulation of the thermal power unit by the power grid according to the time scale, so that the problems of the unit caused by poor flow characteristics of DEH valves, the influence of the unit operation parameters and lifting loads on the primary frequency modulation and the like are solved, and the frequency modulation capability of the unit in different load operation can meet the frequency modulation requirements of the power grid on the thermal power unit. The speed and durability of the unit in response to primary frequency modulation before and after the control strategy optimization are obviously improved, so that the purpose of improving the unit primary frequency modulation performance index 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 embodiments of the invention and together with the description serve to explain the invention and do not constitute a undue limitation of the invention, and in which:
FIG. 1 is a control logic diagram of a primary frequency modulation control method that accounts for dynamic frequency modulation amplitude and integrated electric quantity of a power grid;
FIG. 2 is a logic diagram of a theoretical integration electric quantity implementation;
fig. 3 is a logic diagram of the actual integrated power implementation.
In the figure: 1-a first high-low limit judging module; 2-a timer module; a 3-function module; 4-a first divider; 5-a first switcher module; a 6-multiplier module; 7-a time delay module; 8-an inertial module; a 9-second divider; 10-a second high-low limit judging module; 11-a first pulse module; 12-a first AND module; 13-a second switcher module; 14-a third switcher module; 15-a first adder module; 16-a third high-low limit judging module; 17-a second pulse module; 18-a second AND module; 19-a fourth switcher module; 20-a fifth switcher module; 21-a second adder module; 22-a sixth switcher module; 23-subtracter; 24-third divider.
The same reference numerals will be used throughout the drawings to refer to 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 solution of the present invention will be 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 scheme and practical situation of the present invention. Well-known methods, procedures, flows, components and circuits have not been described in detail so as not to obscure the nature of the invention.
In the primary frequency modulation action process, the power grid 'two rules' mainly has two assessment indexes according to time scales, the two indexes are respectively stressed, one is that the primary frequency modulation of the unit is required to be rapidly operated in the early stage of the primary frequency modulation action, the load adjustment amplitude in 15s is required to reach 90% of the primary frequency modulation theoretical adjustment load corresponding to the frequency extreme point in 15s, and the rapidity and the frequency modulation amplitude of the primary frequency modulation of the assessment unit are stressed. And the other is that the actual integral electric quantity of the primary frequency modulation of the unit reaches more than 90% of the expected integral electric quantity during the whole primary frequency modulation action, and the primary frequency modulation endurance is mainly focused.
According to the method, a primary frequency modulation control method based on the 'two rules' of the power grid is formulated based on the assessment mode, namely, a time-division action quantity compensation is carried out on a DEH side primary frequency modulation quantity instruction, the requirement of the 'two rules' of the assessment index on response time and frequency modulation amplitude is met by increasing a frequency modulation coefficient in a primary frequency modulation action 15s, after the primary frequency modulation action 15s, the primary frequency modulation action quantity is corrected by the ratio of theoretical integral electric quantity and actual integral electric quantity, and the durability of primary frequency modulation is ensured to meet the requirement of the 'two rules'.
The DEH, namely a digital electrohydraulic control system of the steam turbine, is called digital electric regulation for short, and is an important component of the DCS.
The control logic of the primary frequency modulation control method based on the check index of the power grid 'two rules' (namely, the primary frequency modulation control method considering the dynamic frequency modulation amplitude and the integral electric quantity of the power grid) is shown in figure 1.
(1) Frequency modulation quantity instruction optimization logic
After the frequency modulation quantity instruction signal is corrected by the first correction coefficient and the second correction coefficient, a corrected frequency modulation quantity instruction is generated, and the corrected frequency modulation quantity instruction is sent to the DEH and is used as dynamic feedforward for compensation. And one side of the correction coefficient is used for improving the response of the primary frequency modulation speed of the unit, and the other side of the correction coefficient is used for improving the durability of the primary frequency modulation of the unit.
Frequency modulation amount instruction optimization logic:
As shown in fig. 1, after the frequency modulation amount instruction passes through the first high-low limit judging module 1, a primary frequency modulation action signal of the unit is generated, the high-low limit action is limited to be greater than zero or less than zero, and after the primary frequency modulation action signal passes through the timer module 2, primary frequency modulation action time is generated. And outputting a correction coefficient I of the frequency modulation quantity instruction after the primary frequency modulation action time passes through the function module 3. Primary frequency modulation action time coefficient function:
TABLE 1 Primary frequency modulation action time and correction coefficient-relation function
The theoretical integrated power signal the actual integrated power signal is passed through the first divider 4 and an integrated power adjustment factor is generated, which is the theoretical integrated power divided by the actual integrated power. The integral electric quantity adjusting factor and a 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 correction coefficient II. The output signal of the primary frequency modulation action time after passing through the delay module 7 is used as the switching condition of the first switcher module 5, the delay time is set to 15s, namely the primary frequency modulation action is performed within 15 seconds to ensure that the unit integral electric quantity is mainly performed after 15 seconds. After the frequency modulation quantity instruction, the correction coefficient I and the correction coefficient II are simultaneously sent to the multiplier module 6, the multiplier module 6 outputs the corrected frequency modulation quantity instruction.
(2) Logic for realizing theoretical integral electric quantity
The theoretical integral electric quantity is an integral value of the primary frequency modulation expected load change after the power grid frequency change exceeds the dead zone of the unit, and the integral value is continuously used for 60s from the time when the power grid frequency change exceeds the primary frequency modulation dead zone or until the frequency returns to the primary frequency modulation dead zone.
As shown in fig. 2, dividing the frequency modulation quantity instruction into two paths, wherein one path is transmitted to the inertia module 8, and the frequency modulation quantity 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, the expected load variation 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 of the signals is transmitted to the second high-low limit judging module 10, the signals output by the second high-low limit judging module 10 by the frequency modulation quantity instruction are primary frequency modulation action signals, the primary frequency modulation action signals and the signals which pass through the first pulse module 11 are simultaneously transmitted to the first and module 12, the output of the first and module 12 is the primary frequency modulation check action signals which trigger the integral electric quantity of the power grid check index to start to integrate, namely the power grid frequency change exceeds the primary frequency modulation dead zone to start to last for 60 seconds or until the frequency returns to the primary frequency modulation dead zone, wherein the time of the first pulse module 11 is set to be 60 seconds; 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 maintain a theoretical integrated electric quantity of a 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, and integration operation on the expected load of the power grid is achieved through accumulation, and the output end of the first adder module 15 is connected with the Y end of the second switcher module 13.
(3) Actual integral electric quantity realizing logic
The actual integrated electric quantity is an integrated value of the primary frequency modulation actual frequency modulation quantity after the change of the power grid frequency exceeds the dead zone of the unit, and the time lasts for 60 seconds 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 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 subtractor 23 together with the unit load signal, and during the primary frequency modulation operation, the sixth switching module 22 is operative to record the load before the primary frequency modulation operation during the primary frequency modulation operation, and the subtractor 17 is operative to produce the actual frequency modulation amount of the unit. 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 for each scanning period by the third divider 24.
The frequency modulation quantity instruction is transmitted to the third high-low limit judging module 16, the signal output by the third high-low limit judging module 16 of the frequency modulation quantity instruction is a primary frequency modulation action signal, the primary frequency modulation action signal and the signal which passes through the second pulse module 17 are simultaneously transmitted to the second and module 18, the output of the second and module 18 is a primary frequency modulation check action signal which triggers the integral electric quantity of the power grid check index to start to integrate, namely the power grid frequency change exceeds a primary frequency modulation dead zone to start to last for 60 seconds or until the frequency returns to the primary frequency modulation dead zone, wherein the time of the second pulse module 17 is set to be 60 seconds; the primary frequency modulation checking action signals are respectively sent to the fourth switcher module 19 and the fifth switcher module 20, when the signals are 1, the fourth switcher module 19 and the fifth switcher module 20 select Y input, and when the signals are 0, the fourth switcher module 19 and the fifth switcher module 20 select N input; the fifth switcher module 20 is configured to keep the actual integrated power 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 sent to the second adder module 21 together, and integration operation on the actual frequency modulation amount of the unit is achieved through accumulation, and the output end of the second adder module 21 is connected with the Y end of the fourth switcher module 19.
The Y-terminal input of the second switcher module 13 is: and accumulating the electric quantity of each sampling period in the effective action time (the change of the power grid frequency exceeds the effective action time of the primary frequency modulation and lasts for 60 seconds or until the frequency returns to the primary frequency modulation dead zone), and calculating the sampling value of each period according to 0 when the electric quantity of each sampling period exceeds the effective action time of the primary frequency modulation.
The N-terminal input of the second switcher module 13 is: constant 0.
The Y-terminal input of the third switch module 14 is: the theoretical integration of the electrical quantity.
The N-terminal input of the third switch module 14 is: when the primary frequency modulation is not effectively operated, the output of the switcher keeps the output value at the last moment.
The Y-terminal input of the fourth switch module 19 is: the actual integral electric quantity in the effective action time of the primary frequency modulation (the change of the power grid frequency exceeds the primary frequency modulation dead zone for 60 seconds or until the frequency returns to the primary frequency modulation dead zone), the electric quantity of each sampling period is accumulated in the effective action time, and when the effective action time of the primary frequency modulation is exceeded, the sampling value of each period is calculated according to 0.
The N-terminal input of the fourth switch module 19 is: constant 0.
The Y-terminal input of the fifth switch module 20 is: the amount of electricity is actually integrated.
The N-terminal input of the fifth switcher module 20 is: when the primary frequency modulation is not effectively operated, the output of the switcher keeps the output value at the last moment.
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 components in the power system, and the method provided by the invention organically integrates all the devices or modules into a whole, and the fact that the specific structures of the devices or the modules, which each realize functions, are all existing in the prior art, are realized in terms of monomers, and protocols, software or programs related to the devices and/or modules when working are fully known in the prior art exist in the prior art.
Claims (4)
1. 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: generating a primary frequency modulation action signal of the unit after the frequency modulation quantity instruction signal passes through the first high-low limit judging module (1), and generating primary frequency modulation action time after the primary frequency modulation action signal passes through the timer module (2); outputting a correction coefficient I of the frequency modulation quantity instruction after the primary frequency modulation action time passes through the function module (3);
Inputting the obtained theoretical integrated electric quantity signal and the actual integrated electric quantity signal into a first divider (4), processing the theoretical integrated electric quantity signal and the actual integrated electric quantity signal by the first divider (4) to generate an integrated electric quantity regulating factor, inputting the integrated electric quantity regulating factor and a constant a into a first switcher module (5), and processing the integrated electric quantity regulating factor and the constant a by the first switcher module (5) to generate a correction coefficient II of the frequency modulation command, wherein the value of the constant a is 1;
Step 2: after the frequency modulation quantity 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 quantity instruction signal is corrected by the first correction coefficient and the second correction coefficient to generate a corrected frequency modulation quantity instruction, and the corrected frequency modulation quantity instruction is sent to DEH to be used as dynamic feedforward for compensation, so that primary frequency modulation control is completed;
In the step 1, the 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 switcher module (5), the delay time is set to be 15s, namely, the first switcher module (5) selects an N end as an input end of the primary frequency modulation action within 15 seconds, and at the moment, the correction coefficient II 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 of the Y end, and the correction coefficient II is the ratio of the theoretical integral electric quantity to the actual integral electric quantity;
the theoretical integral electric quantity is obtained as follows:
Dividing the frequency modulation quantity instruction into two paths, wherein one path is transmitted to an inertia module (8), and the frequency modulation quantity instruction is output into the expected load variation of the power grid through the inertia module (8); the time constant of the inertia module (8) is 6s, the expected load variation 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 of the signals is transmitted to a second high-low limit judging module (10), signals of the frequency modulation quantity instructions output by the second high-low limit judging module (10) are primary frequency modulation action signals, the primary frequency modulation action signals and signals of the primary frequency modulation action signals and the signals after the primary frequency modulation action signals pass through a first pulse module (11) are simultaneously transmitted to a first and module (12), the output of the first and module (12) is the primary frequency modulation check action signals triggering the integral electric quantity of the power grid check index to start to integrate, namely the power grid frequency change exceeds a primary frequency modulation dead zone to start to last for 60 seconds or until the frequency returns to the primary frequency modulation dead zone, wherein the time of the first pulse module (11) is set to be 60 seconds; the primary frequency modulation checking action signals are respectively sent to the second switcher module (13) and the third switcher module (14), when the signals are 1, the second switcher module (13) and the third switcher module (14) select Y input, and when the signals are 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 last 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, integral operation on expected load of the power grid is achieved through accumulation, and the output end of the first adder module (15) is connected with the Y end of the second switcher module (13);
the actual integral electric quantity is obtained as follows:
After passing through the sixth switching module (22), the unit load signal and the unit load signal are sent to the subtracter (23), when primary frequency modulation is performed, the sixth switching module (22) is used for recording the load before the primary frequency modulation, 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), and the actual frequency modulation quantity of the unit in each scanning period is output through the third divider (24);
The frequency modulation quantity instruction is transmitted to a third high-low limit judging module (16), a signal output by the frequency modulation quantity instruction passing through the third high-low limit judging module (16) is a primary frequency modulation action signal, the primary frequency modulation action signal and a signal 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 an integral primary frequency modulation check action signal which triggers the integral electric quantity of a power grid check index, namely the power grid frequency change exceeds a primary frequency modulation dead zone and lasts for 60 seconds or until the frequency returns to the primary frequency modulation dead zone, wherein the time of the second pulse module (17) is set to be 60 seconds; the primary frequency modulation checking action signals are respectively sent to a fourth switcher module (19) and a fifth switcher module (20), when the signals are 1, the fourth switcher module (19) and the fifth switcher module (20) select Y input, and when the signals are 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 last 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, integral operation on the actual frequency modulation quantity of the unit is achieved through accumulation, and the output end of the second adder module (21) is connected with the Y end of the fourth switcher module (19).
2. The primary frequency modulation control method taking account of power grid dynamic frequency modulation amplitude and integrated electric quantity as set forth in claim 1, wherein: the integrated charge amount adjustment factor is a theoretical integrated charge amount divided by an actual integrated charge amount.
3. The primary frequency modulation control method taking account of power grid dynamic frequency modulation amplitude and integrated electric quantity as set forth in claim 1, wherein: the correction coefficient II selects whether the integrated electric quantity adjustment factor or the constant a through primary frequency modulation action time, when the primary frequency modulation action is not more than 15s, the correction coefficient II selects the constant a, a=1, namely the correction coefficient II is 1 at the moment, and the correction coefficient II does not correct the frequency modulation quantity instruction; when the primary frequency modulation action exceeds 15s, the correction coefficient II selects an integral electric quantity adjusting factor, namely, the value of the correction coefficient II is the ratio of the theoretical integral electric quantity to the actual integral electric quantity.
4. The primary frequency modulation control method taking account of power grid dynamic frequency modulation amplitude and integrated electric quantity as set forth in claim 1, wherein: and the frequency modulation quantity 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 frequency modulation quantity instruction signal, the first correction coefficient and the second correction coefficient to obtain a corrected frequency modulation quantity instruction.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103779862A (en) * | 2014-02-12 | 2014-05-07 | 国家电网公司 | Primary frequency modulation regulating system and method under unit plant TF |
| CN109638879A (en) * | 2018-12-14 | 2019-04-16 | 国网山东省电力公司电力科学研究院 | Primary frequency modulation dynamic compensation adjustment system and method based on performance indicator assessment |
| CN109636247A (en) * | 2019-01-14 | 2019-04-16 | 国电南瑞科技股份有限公司 | A kind of fired power generating unit primary frequency modulation performance performance assessment criteria calculation method and its system |
| CN111697597A (en) * | 2020-07-27 | 2020-09-22 | 国网江苏省电力有限公司 | Fire storage combined AGC frequency modulation control method based on particle swarm optimization |
| WO2020252813A1 (en) * | 2019-06-20 | 2020-12-24 | 上海交通大学 | Double-layer adaptive inertia control method and device for inverter interfaced distributed generator |
| CN112615399A (en) * | 2020-11-24 | 2021-04-06 | 国网江苏省电力有限公司 | Energy storage system participating power grid frequency modulation optimization control method and system and storage medium |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110112769B (en) * | 2019-04-16 | 2023-03-31 | 西安理工大学 | Output feedback self-adaptive control method for virtual synchronous machine |
-
2022
- 2022-06-16 CN CN202210678446.4A patent/CN114928119B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103779862A (en) * | 2014-02-12 | 2014-05-07 | 国家电网公司 | Primary frequency modulation regulating system and method under unit plant TF |
| CN109638879A (en) * | 2018-12-14 | 2019-04-16 | 国网山东省电力公司电力科学研究院 | Primary frequency modulation dynamic compensation adjustment system and method based on performance indicator assessment |
| CN109636247A (en) * | 2019-01-14 | 2019-04-16 | 国电南瑞科技股份有限公司 | A kind of fired power generating unit primary frequency modulation performance performance assessment criteria calculation method and its system |
| WO2020252813A1 (en) * | 2019-06-20 | 2020-12-24 | 上海交通大学 | Double-layer adaptive inertia control method and device for inverter interfaced distributed generator |
| CN111697597A (en) * | 2020-07-27 | 2020-09-22 | 国网江苏省电力有限公司 | Fire storage combined AGC frequency modulation control method based on particle swarm optimization |
| CN112615399A (en) * | 2020-11-24 | 2021-04-06 | 国网江苏省电力有限公司 | Energy storage system participating power grid frequency modulation optimization control method and system and storage medium |
Non-Patent Citations (1)
| Title |
|---|
| 吉林电网火电机组一次调频存在的问题及对策;刁云鹏;司瑞才;夏志;王松寒;金春林;;吉林电力;20171225(第06期);全文 * |
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