CN113835372B - Control system and method for electrode type electric boiler to assist primary frequency modulation of thermal power generating unit - Google Patents
Control system and method for electrode type electric boiler to assist primary frequency modulation of thermal power generating unit Download PDFInfo
- Publication number
- CN113835372B CN113835372B CN202110996197.9A CN202110996197A CN113835372B CN 113835372 B CN113835372 B CN 113835372B CN 202110996197 A CN202110996197 A CN 202110996197A CN 113835372 B CN113835372 B CN 113835372B
- Authority
- CN
- China
- Prior art keywords
- electric boiler
- frequency modulation
- module
- power consumption
- value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/25—Pc structure of the system
- G05B2219/25257—Microcontroller
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Feedback Control In General (AREA)
Abstract
The invention discloses a control system and a control method for electrode type electric boiler auxiliary primary frequency modulation of a thermal power unit, which belong to the technical field of thermal power unit control, wherein the control system comprises an electrode type electric boiler frequency modulation power consumption correction logic circuit and an electrode type electric boiler power consumption control logic circuit; the control method comprises an electrode type electric boiler frequency modulation power consumption correction procedure and an electric boiler power consumption control procedure. Therefore, the primary frequency modulation performance of the thermal power generating unit is directly and automatically adjusted by the steam turbine adjusting gate without depending on the steam turbine adjusting system, so that the primary frequency modulation response is finished, the service life of thermal power generating unit equipment is prolonged, and the economical efficiency of the thermal power generating unit is enhanced.
Description
Technical Field
The invention relates to the technical field of control of thermal power units, in particular to a control system and a control method for auxiliary primary frequency modulation of a thermal power unit by an electrode type electric boiler.
Background
In daily power grid operation, the primary frequency modulation control function of the thermal power generating unit must meet the requirement of being capable of realizing stable control, and at present, certain parameters of the control system of certain thermal power generating units such as unequal rate, frequency difference function and the like are not set correctly, so that ideal adjusting effect is difficult to obtain. In addition, the AGC function of the thermal power unit is not effectively coordinated, so that the load response is insufficient, the speed is low, the implementation is difficult to be carried out continuously, the primary frequency modulation control function cannot meet the requirement, the primary frequency modulation function of the thermal power unit cannot fully play a role, and the stability of the power grid frequency is seriously influenced. Therefore, primary frequency modulation analysis of the thermal power generating unit is needed, and performance is optimized, so that the stability of the power grid frequency is ensured. The primary frequency modulation function of the thermal power unit generally utilizes the heat accumulation of a boiler to quickly respond to the change of the frequency of a power grid by adjusting the opening of a steam turbine regulating gate, and the frequency modulation mode can cause the quick change of the steam turbine regulating gate and the rotating speed of the steam turbine of the thermal power unit when the frequency of the power grid is frequently changed, so that the safe operation of the thermal power unit is seriously influenced. Since the development of the project of modifying the flexibility of the ignition test of the national energy bureau in 2016, the electrode type electric boiler is widely applied to assisting the peak regulation of the power grid of the thermal power unit, but the research and application of assisting the thermal power unit in the fields of primary frequency modulation and the like are not developed, and the flexibility of the electrode type electric boiler cannot be really exerted.
Disclosure of Invention
The invention aims to provide a control system and a control method for auxiliary primary frequency modulation of a thermal power unit by an electrode type electric boiler, so that the primary frequency modulation performance of the thermal power unit is directly and automatically adjusted by a steam turbine regulating valve without depending on a steam turbine self-regulating system to finish primary frequency modulation response, thereby prolonging the service life of thermal power unit equipment and enhancing the economical efficiency of the thermal power unit.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention provides a control system for assisting primary frequency modulation of a thermal power unit by an electrode type electric boiler, which is characterized by comprising the following components: the electrode type electric boiler frequency modulation power consumption correction logic circuit and the electrode type electric boiler power consumption control logic circuit;
the electrode type electric boiler frequency modulation power consumption correction logic circuit comprises a first subtracter module, a primary frequency modulation compensation function module, a second subtracter module, a third subtracter module, a high-selection module, a low-selection module and a fourth subtracter module, wherein the first subtracter module is used for performing subtraction operation on the actual frequency of a power grid and the standard frequency 50Hz of the power grid to obtain a frequency difference signal; the primary frequency modulation compensation function module is connected with the first subtracter module, and is configured to calculate a frequency modulation load value delta P according to the frequency difference signal and output the frequency modulation load value delta P; the second subtracter module is used for performing subtraction operation on the electric power consumption set value of the electric boiler and the minimum electric power consumption value of the electric boiler to generate a frequency modulation lower limit value delta P1 of the electric boiler; the third subtracter module is used for performing subtraction operation on the electric power consumption set value of the electric boiler and the maximum electric power consumption value of the electric boiler to generate an electric boiler frequency modulation upper limit value delta P2; the high selection module is respectively connected with the primary frequency modulation compensation function module and the second subtracter module, compares the frequency modulation load value delta P with the frequency modulation lower limit value delta P1 of the electric boiler, and selects the highest value as an output value; the low selection module is respectively connected with the third subtracter module and the high selection module, compares the output value of the high selection module with the electric boiler frequency modulation upper limit value delta P2 output by the third subtracter module, and the lowest value in the two values is selected as an electric boiler frequency modulation power consumption correction value delta P3 to be output; the fourth subtracter module is respectively connected with the primary frequency modulation compensation function module and the low selection module, and performs subtraction operation on the frequency modulation load value delta P and the electric boiler frequency modulation power consumption correction value delta P3 to generate a unit frequency modulation load value delta P4;
the electrode type electric boiler power consumption control logic circuit comprises a first adder module, an electric boiler power consumption controller PID module, a power consumption water level executor function module and a second adder module; the first adder module is connected with the low selection module, and performs addition operation on the electric boiler frequency modulation power consumption correction value delta P3 and an electric boiler power consumption set value to generate an electric boiler power consumption set value Ps; the PID module of the electric boiler power consumption controller is connected with the first adder module, and performs PID operation on the electric boiler power consumption given value Ps and the electric boiler power consumption actual value Pv; the power consumption water level executor function module is connected with the first adder module; the second adder module is respectively connected with the PID module of the electric boiler power consumption controller and the function module of the power consumption water level executor, and performs addition operation on the output values of the PID module of the electric boiler power consumption controller and the function module of the power consumption water level executor, and finally outputs the control instruction of the electric boiler water level adjustment executor.
Further, the primary frequency modulation compensation function of the primary frequency modulation compensation function module is as follows:
wherein: Δp is the frequency modulation load; delta is the rotation speed inequality; Δf is the frequency difference; pn unit rated capacity.
Further, the transfer function of the PID module of the electric boiler power consumption controller is as follows:
e(t)＝Pv-Ps
wherein PID (out) is output by a PID module, and e (t) is control deviation; kp is a proportionality coefficient, ti is an integration time; td is the differential time; ps is the given value of the power consumption of the electric boiler; pv is the actual value of the electric power consumption of the electric boiler; t is the process time; dt is the integral variable.
Further, the mathematical description formula of the power consumption water level executor function module is:
y＝0.5x
x represents the power consumption water level executor function module input;
y represents the power consumption water level executor function module output.
The invention also provides a control method for assisting primary frequency modulation of the thermal power unit by the electrode type electric boiler, which is characterized by comprising the following steps of:
s1: electrode type electric boiler frequency modulation power consumption correction procedure
(1) Inputting the actual frequency of the power grid and the standard frequency of 50Hz of the power grid into a first subtracter module at the same time, and performing subtraction operation to obtain a frequency difference signal;
(2) inputting the frequency difference signal into a primary frequency modulation compensation function module for processing, and outputting a frequency modulation load value delta P after processing by the primary frequency modulation compensation function module;
(3) simultaneously inputting the electric power consumption set value of the electric boiler and the minimum electric power consumption value of the electric boiler into a second subtracter module for subtraction operation to generate a frequency modulation lower limit value delta P1 of the electric boiler;
(4) the electric power consumption set value of the electric boiler and the maximum electric power consumption value of the electric boiler are simultaneously input into a third subtracter module, and after subtraction operation is carried out by the third subtracter module, the frequency modulation upper limit value delta P2 of the electric boiler is generated;
(5) simultaneously transmitting the frequency modulation load value delta P and the frequency modulation lower limit value delta P1 of the electric boiler to a high selection module, comparing the frequency modulation load value delta P with the frequency modulation lower limit value delta P1 of the electric boiler by the high selection module, and selecting the highest value as an output value;
(6) the output value of the high selection module and the frequency modulation load value delta P output by the primary frequency modulation compensation function module are simultaneously input to the low selection module, and the lowest value in the two input values is selected as the frequency modulation power consumption correction value delta P3 of the electric boiler through the low selection module to be output;
(7) the frequency modulation load value delta P output by the primary frequency modulation compensation function module and the frequency modulation power consumption correction value delta P3 of the electric boiler output by the low selection module are simultaneously input to a fourth subtracter module, and after subtraction operation is carried out by the fourth subtracter module, a unit frequency modulation load value delta P4 is generated;
s2: electric boiler power consumption control procedure
(1) The electric boiler frequency modulation power consumption correction value delta P3 output by the low selection module and the electric boiler electric power consumption set value are input into a first adder module to generate an electric boiler power consumption set value Ps;
(2) the given value Ps of the electric boiler power consumption and the actual value Pv of the electric boiler power consumption are transmitted to a PID module of the electric boiler power consumption controller for processing; meanwhile, the given value Ps of the power consumption of the electric boiler is transmitted to a function module of a power consumption water level executor;
(3) the output values of the PID module and the power consumption water level executor function module of the electric boiler are added through a second adder module, and finally, the control instruction of the electric boiler water level adjustment executor is output; during the operation of the unit, the electrode type electric boiler acquires a unit primary frequency modulation instruction, and when the primary frequency modulation instruction is a primary frequency modulation load lifting instruction, the electric boiler water level adjustment executor control instruction controls the electric boiler water level adjustment executor to execute the operation water level reduction of the electrode type electric boiler; when the primary frequency modulation command is a primary frequency modulation load reduction command, the electric boiler water level adjustment executor control command electric boiler water level adjustment executor executes the operation water level improvement of the electrode type electric boiler, so that the purpose of achieving target power consumption by adjusting the water level of the electrode type electric boiler is achieved.
Through the design scheme, the invention has the following beneficial effects: the invention provides a control system and a control method for assisting primary frequency modulation of a thermal power unit by an electrode type electric boiler. During the operation of the thermal power generating unit, the electrode type electric boiler acquires a primary frequency modulation instruction of the thermal power generating unit, when the primary frequency modulation instruction is a primary frequency modulation load lifting instruction, the operation water level of the electrode type electric boiler is reduced, the power consumption of the plant is reduced, and the internet surfing load of the thermal power generating unit is increased; when the primary frequency modulation instruction is a primary frequency modulation load reduction instruction, the operating water level of the electrode type electric boiler is improved, the station power consumption is improved, and the network load of the thermal power unit is reduced, so that the primary frequency modulation performance of the thermal power unit is achieved by directly and automatically adjusting a steam turbine regulating gate without depending on a steam turbine self-regulating system, the service life of thermal power unit equipment is prolonged, and the economical efficiency of the thermal power unit is enhanced.
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 logic block diagram of frequency modulation power consumption correction of an electrode type electric boiler;
fig. 2 is a logic block diagram of power consumption control of an electrode type electric boiler.
In the figure: 1-a first subtractor module; 2-a primary frequency modulation compensation function module; 3-a second subtractor module; 4-a third subtractor module; 5-high selection module; 6-a low selection module; 7-a fourth subtractor module; 8-a first adder module; 9-PID module of electric boiler power consumption controller; 10-a power consumption water level executor function module; 11-a second adder module.
Detailed Description
The invention provides a control system and a control method for assisting a thermal power unit to participate in primary frequency modulation control of a power grid by utilizing the load characteristic of an electrode type electric boiler.
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 description of the present invention, it should be understood that the terms "first," "second," "third," "fourth," and the like are used for descriptive purposes only and that features defining "first," "second," "third," "fourth," and the like, are not necessarily indicative of any order, quantity, or importance, but are merely used to distinguish between different components.
As shown in fig. 1 and 2, the control system for assisting primary frequency modulation of a thermal power unit by an electrode type electric boiler is characterized by comprising: the electrode type electric boiler frequency modulation power consumption correction logic circuit and the electrode type electric boiler power consumption control logic circuit;
the electrode type electric boiler frequency modulation power consumption correction logic circuit comprises a first subtracter module 1, a primary frequency modulation compensation function module 2, a second subtracter module 3, a third subtracter module 4, a high-selection module 5, a low-selection module 6 and a fourth subtracter module 7, wherein the first subtracter module 1 is used for performing subtraction operation on the actual frequency of a power grid and the standard frequency 50Hz of the power grid to obtain a frequency difference signal; the primary frequency modulation compensation function module 2 is connected with the first subtracter module 1, and the primary frequency modulation compensation function module 2 is configured to calculate a frequency modulation load value delta P according to the frequency difference signal and output the frequency modulation load value delta P; the second subtracter module 3 is used for performing subtraction operation on the electric power consumption set value of the electric boiler and the minimum electric power consumption value of the electric boiler to generate a frequency modulation lower limit value delta P1 of the electric boiler; the third subtracter module 4 is used for performing subtraction operation on the electric power consumption set value of the electric boiler and the maximum electric power consumption value of the electric boiler to generate an electric boiler frequency modulation upper limit value delta P2; the high selection module 5 is respectively connected with the primary frequency modulation compensation function module 2 and the second subtracter module 3, and the high selection module 5 compares the frequency modulation load value delta P with the frequency modulation lower limit value delta P1 of the electric boiler and selects the highest value as an output value; the low selection module 6 is respectively connected with the third subtractor module 4 and the high selection module 5, the low selection module 6 compares the output value of the high selection module 5 with the electric boiler frequency modulation upper limit value delta P2 output by the third subtractor module 4, and the lowest value in the two values is selected to be output as an electric boiler frequency modulation power consumption correction value delta P3; the fourth subtracter module 7 is respectively connected with the primary frequency modulation compensation function module 2 and the low selection module 6, and the fourth subtracter module 7 performs subtraction operation on the frequency modulation load value delta P and the electric boiler frequency modulation power consumption correction value delta P3 to generate a unit frequency modulation load value delta P4;
the electrode type electric boiler power consumption control logic circuit comprises a first adder module 8, an electric boiler power consumption controller PID module 9, a power consumption water level executor function module 10 and a second adder module 11; the first adder module 8 is connected with the low selection module 6, and the first adder module 8 carries out addition operation on the electric boiler frequency modulation power consumption correction value delta P3 and an electric boiler power consumption set value to generate an electric boiler power consumption set value Ps; the PID module 9 of the electric boiler power consumption controller is connected with the first adder module 8, and the PID module 9 of the electric boiler power consumption controller carries out PID operation on the given value Ps of the electric boiler power consumption and the actual value Pv of the electric boiler power consumption; the power consumption water level executor function module 10 is connected with the first adder module 8, and the power consumption water level executor function module 10 is used for quickly responding to the changing requirement of the electrode type electric boiler power; the output value of the power consumption water level executor function module 10 is a feedforward value of the power consumption water level executor instruction; the second adder module 11 is respectively connected with the electric boiler power consumption controller PID module 9 and the power consumption water level executor function module 10, and the second adder module 11 performs addition operation on output values of the electric boiler power consumption controller PID module 9 and the power consumption water level executor function module 10, and finally outputs an electric boiler water level adjustment executor control instruction.
The mathematical description formula of the primary frequency modulation compensation function module 2 is as follows:
wherein: Δp is the frequency modulation load; delta is the rotation speed inequality; Δf is the frequency difference (difference in frequency versus frequency dead zone); pn unit rated capacity.
Taking a 300MW thermal power generating unit as an example, the unit unequal rate is set to be 5%, and the corresponding primary frequency modulation compensation function is shown in table 1:
table 1 primary frequency modulation compensation function curve setting table
The mathematical description formula of the PID module 9 of the electric boiler power consumption controller is as follows:
e(t)＝Pv-Ps
wherein PID (out) is output by a PID module, and e (t) is control deviation; kp is a proportionality coefficient, ti is an integration time; td is the differential time; ps is the given value of the power consumption of the electric boiler; pv is the actual value of the electric power consumption of the electric boiler; t is the process time; dt is the integral variable.
The mathematical description of the power consumption water level actuator function module 10 is:
y＝0.5x
x represents the power consumption water level executor function module input;
y represents the output of the power consumption water level executor function module;
the capacity of the electrode-type electric boiler is 40MW, and the function module of the power consumption water level executor is set as shown in Table 2
Table 2 table of power consumption water level executor function modules
The primary frequency modulation control logic of the electrode type electric boiler auxiliary thermal power unit comprises two parts: firstly, electrode type electric boiler frequency modulation power consumption correction logic, as shown in figure 1, when primary frequency modulation load quantity is in a set amplitude range, the power consumption of the electrode type electric boiler is utilized to realize the load change requirement, and a primary frequency modulation control system of a thermal power unit does not regulate; when the primary frequency modulation load exceeds the set amplitude range, the exceeding part is regulated by a primary frequency modulation control system of the thermal power generating unit; and secondly, the power consumption control logic of the electrode type electric boiler is that, as shown in fig. 2, the sum of the power consumption frequency correction value of the electrode type electric boiler and a power consumption value manually set by an operator is used as a load set value of a load controller of the electrode type electric boiler, and the purpose of achieving target power consumption is achieved by adjusting the water level of the electrode type electric boiler.
Wherein:
(1) Electrode type electric boiler frequency modulation power consumption correction logic
The actual frequency of the power grid and the standard frequency of the power grid are 50Hz, a frequency difference signal of the thermal power generating unit is generated through the first subtracter module 1, and the frequency difference signal is output to a frequency modulation load value delta P after passing through the primary frequency modulation compensation function module 2. The electric boiler electric power consumption set value and the electric boiler minimum electric power consumption value pass through a second subtracter module 3 to generate an electric boiler frequency modulation lower limit value delta P1; the electric boiler electric power consumption set value and the electric boiler maximum electric power consumption value pass through a third subtracter module 4 to generate an electric boiler frequency modulation upper limit value delta P2; after the frequency modulation load value delta P and the electric boiler frequency modulation lower limit value delta P1 pass through the high selection module 5, the output value of the high selection module 5 and the electric boiler frequency modulation upper limit value delta P2 are sent to the low selection module 6, and finally the electric boiler frequency modulation power consumption correction value delta P3 is generated. And after the frequency modulation load value delta P and the electric boiler frequency modulation power consumption correction value delta P3 pass through the fourth subtracter module 7, generating a unit frequency modulation load value delta P4.
(2) Power consumption control logic for electric boiler
The electrode type electric boiler collects the operation power of the boiler, performs PID operation according to the operation power of the boiler, outputs an adjusting instruction of an electric boiler water level executor to form closed-loop control, and stabilizes the operation power of the boiler.
After the electric boiler frequency modulation power consumption correction value delta P3 and the electric boiler power consumption set value are transmitted to the electric boiler power consumption controller PID module 9 through the first adder module 8, the electric boiler power consumption set value Ps and the electric boiler power consumption actual value Pv are transmitted to the second adder module 11 through the output value of the power consumption water level executor function module 10, and finally the electric boiler water level adjustment executor control command is output.
The invention provides a control system and a control method for assisting primary frequency modulation of a thermal power unit by an electrode type electric boiler. During the running of the thermal power generating unit, the electrode type electric boiler acquires the thermal power generating unit (primary frequency modulation instruction, when the primary frequency modulation instruction is a primary frequency modulation load-increasing instruction, the running water level of the electrode type electric boiler is reduced, the station power consumption is reduced, the internet load of the thermal power generating unit is increased, when the primary frequency modulation instruction is a primary frequency modulation load-decreasing instruction, the running water level of the electrode type electric boiler is increased, the station power consumption is increased, the internet load of the thermal power generating unit is reduced, and therefore the primary frequency modulation performance of the thermal power generating unit is enabled to directly and automatically adjust a steam turbine regulating gate to finish primary frequency modulation response without depending on a steam turbine self-regulating system, the service life of thermal power generating unit equipment is prolonged, and the economical efficiency of the thermal power generating unit is enhanced.
Claims (4)
1. Control system of supplementary thermal power unit primary frequency modulation of electrode formula electric boiler, its characterized in that includes: the electrode type electric boiler frequency modulation power consumption correction logic circuit and the electrode type electric boiler power consumption control logic circuit;
the electrode type electric boiler frequency modulation power consumption correction logic circuit comprises a first subtracter module (1), a primary frequency modulation compensation function module (2), a second subtracter module (3), a third subtracter module (4), a high selection module (5), a low selection module (6) and a fourth subtracter module (7), wherein the first subtracter module (1) is used for carrying out subtraction operation on the actual frequency of a power grid and the standard frequency 50Hz of the power grid to obtain a frequency difference signal; the primary frequency modulation compensation function module (2) is connected with the first subtracter module (1), and the primary frequency modulation compensation function module (2) is configured to calculate a frequency modulation load value delta P according to the frequency difference signal and output the frequency modulation load value delta P; the second subtracter module (3) is used for performing subtraction operation on the electric power consumption set value of the electric boiler and the minimum electric power consumption value of the electric boiler to generate a frequency modulation lower limit value delta P1 of the electric boiler; the third subtracter module (4) is used for performing subtraction operation on the electric power consumption set value of the electric boiler and the maximum electric power consumption value of the electric boiler to generate an electric boiler frequency modulation upper limit value delta P2; the high selection module (5) is respectively connected with the primary frequency modulation compensation function module (2) and the second subtracter module (3), and the high selection module (5) compares the frequency modulation load value delta P with the frequency modulation lower limit value delta P1 of the electric boiler and selects the highest value as an output value; the low selection module (6) is respectively connected with the third subtractor module (4) and the high selection module (5), the low selection module (6) compares the output value of the high selection module (5) with the electric boiler frequency modulation upper limit value delta P2 output by the third subtractor module (4), and the lowest value in the two values is selected as the electric boiler frequency modulation power consumption correction value delta P3 to be output; the fourth subtracter module (7) is respectively connected with the primary frequency modulation compensation function module (2) and the low selection module (6), and the fourth subtracter module (7) performs subtraction operation on the frequency modulation load value delta P and the electric boiler frequency modulation power consumption correction value delta P3 to generate a unit frequency modulation load value delta P4;
the electrode type electric boiler power consumption control logic circuit comprises a first adder module (8), an electric boiler power consumption controller PID module (9), a power consumption water level executor function module (10) and a second adder module (11), wherein the first adder module (8) is connected with a low selection module (6), and the first adder module (8) performs addition operation on the electric boiler frequency modulation power consumption correction value delta P3 and an electric boiler power consumption set value to generate an electric boiler power consumption set value Ps; the PID module (9) of the electric boiler power consumption controller is connected with the first adder module (8), and the PID module (9) of the electric boiler power consumption controller carries out PID operation on the given value Ps of the electric boiler power consumption and the actual value Pv of the electric boiler power consumption; the power consumption water level executor function module (10) is connected with the first adder module (8); the second adder module (11) is respectively connected with the PID module (9) of the electric boiler power consumption controller and the function module (10) of the power consumption water level executor, the second adder module (11) carries out addition operation on the output values of the PID module (9) of the electric boiler power consumption controller and the function module (10) of the power consumption water level executor, and finally, the control instruction of the electric boiler water level adjustment executor is output;
the primary frequency modulation compensation function of the primary frequency modulation compensation function module (2) is as follows:
wherein: Δp is the frequency modulation load; delta is the rotation speed inequality; Δf is the frequency difference; pn unit rated capacity.
2. The control system for assisting primary frequency modulation of a thermal power unit by using an electrode type electric boiler according to claim 1, wherein: the transfer function of the PID module (9) of the electric boiler power consumption controller is as follows:
e(t)＝Pv-Ps
wherein PID (out) is output by a PID module, and e (t) is control deviation; kp is a proportionality coefficient, ti is an integration time; td is the differential time; ps is the given value of the power consumption of the electric boiler; pv is the actual value of the electric power consumption of the electric boiler; t is the process time; dt is the integral variable.
3. The control system for assisting primary frequency modulation of a thermal power unit by using an electrode type electric boiler according to claim 1, wherein: the mathematical description formula of the power consumption water level executor function module (10) is as follows:
y＝0.5x
x represents the power consumption water level executor function module input;
y represents the power consumption water level executor function module output.
4. A control method for assisting primary frequency modulation of a thermal power generating unit by an electrode type electric boiler, which is characterized in that the method is based on the control system of claim 1, 2 or 3, and comprises the following steps:
s1: electrode type electric boiler frequency modulation power consumption correction procedure
(1) Inputting the actual frequency of the power grid and the standard frequency of 50Hz of the power grid into a first subtracter module (1) at the same time, and performing subtraction operation to obtain a frequency difference signal;
(2) inputting the frequency difference signal into a primary frequency modulation compensation function module (2) for processing, and outputting a frequency modulation load value delta P after the primary frequency modulation compensation function module (2) processes the frequency difference signal;
(3) simultaneously inputting the electric power consumption set value of the electric boiler and the minimum electric power consumption value of the electric boiler into a second subtracter module (3) for subtraction operation to generate a frequency modulation lower limit value delta P1 of the electric boiler;
(4) the set value of the electric power consumption of the electric boiler and the maximum electric power consumption value of the electric boiler are simultaneously input into a third subtracter module (4), and after subtraction operation is carried out by the third subtracter module (4), the frequency modulation upper limit value delta P2 of the electric boiler is generated;
(5) simultaneously transmitting the frequency modulation load value delta P and the frequency modulation lower limit value delta P1 of the electric boiler to a high selection module (5), comparing the frequency modulation load value delta P with the frequency modulation lower limit value delta P1 of the electric boiler by the high selection module (5), and selecting the highest value as an output value;
(6) the output value of the high selection module (5) and the frequency modulation load value delta P output by the primary frequency modulation compensation function module (2) are simultaneously input to the low selection module (6), and the lowest value in the two input values is selected by the low selection module (6) to be used as the frequency modulation power consumption correction value delta P3 of the electric boiler to be output;
(7) the frequency modulation load value delta P output by the primary frequency modulation compensation function module (2) and the frequency modulation power consumption correction value delta P3 of the electric boiler output by the low selection module (6) are simultaneously input into a fourth subtracter module (7), and the fourth subtracter module (7) performs subtraction operation to generate a unit frequency modulation load value delta P4;
s2: electric boiler power consumption control procedure
(1) The electric boiler frequency modulation power consumption correction value delta P3 output by the low selection module (6) and the electric boiler power consumption set value are input into the first adder module (8) to generate an electric boiler power consumption set value Ps;
(2) the given value Ps of the electric boiler power consumption and the actual value Pv of the electric boiler power consumption are transmitted to a PID module (9) of the electric boiler power consumption controller for processing; simultaneously, the given value Ps of the power consumption of the electric boiler is transmitted to a power consumption water level executor function module (10);
(3) the output values of the PID module (9) of the electric boiler power consumption controller and the function module (10) of the power consumption water level executor are added through a second adder module (11), and finally, the control instruction of the electric boiler water level adjustment executor is output; during the operation of the thermal power generating unit, the electrode type electric boiler acquires a primary frequency modulation instruction of the thermal power generating unit, and when the primary frequency modulation instruction is a primary frequency modulation load lifting instruction, the electric boiler water level adjustment executor control instruction controls the electric boiler water level adjustment executor to execute the operation water level reduction of the electrode type electric boiler; when the primary frequency modulation command is a primary frequency modulation load reduction command, the electric boiler water level adjustment executor control command electric boiler water level adjustment executor executes the operation water level improvement of the electrode type electric boiler, so that the purpose of achieving target power consumption by adjusting the water level of the electrode type electric boiler is achieved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110996197.9A CN113835372B (en) | 2021-08-27 | 2021-08-27 | Control system and method for electrode type electric boiler to assist primary frequency modulation of thermal power generating unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110996197.9A CN113835372B (en) | 2021-08-27 | 2021-08-27 | Control system and method for electrode type electric boiler to assist primary frequency modulation of thermal power generating unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113835372A CN113835372A (en) | 2021-12-24 |
| CN113835372B true CN113835372B (en) | 2023-04-28 |
Family
ID=78961563
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110996197.9A Active CN113835372B (en) | 2021-08-27 | 2021-08-27 | Control system and method for electrode type electric boiler to assist primary frequency modulation of thermal power generating unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113835372B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115133582A (en) * | 2022-06-16 | 2022-09-30 | 吉林省电力科学研究院有限公司 | AGC frequency modulation control method for auxiliary thermal power generating unit of electrode type electric boiler |
| US20240113527A1 (en) * | 2022-10-04 | 2024-04-04 | Rondo Energy, Inc. | System for voltage-controlled power grid regulation based upon input variable energy sources |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1854964A1 (en) * | 2006-05-10 | 2007-11-14 | Siemens Aktiengesellschaft | Use of the steam turbine for primary frequency control in power generating plants |
| CN102646980A (en) * | 2012-04-12 | 2012-08-22 | 山东电力研究院 | Novel primary frequency-modulation compensation control method of unit thermal generator set |
| CN105627291A (en) * | 2014-12-01 | 2016-06-01 | 安阳方快锅炉有限公司 | Variable-frequency water supply control method for steam boiler |
| CN109343409A (en) * | 2018-10-30 | 2019-02-15 | 华能国际电力股份有限公司福州电厂 | A kind of supplementary controlled system and method for full admission unit primary frequency modulation |
| CN112467805A (en) * | 2020-12-10 | 2021-03-09 | 华能威海发电有限责任公司 | Double-asynchronous feedback thermal power generation primary and secondary frequency modulation comprehensive optimization system |
-
2021
- 2021-08-27 CN CN202110996197.9A patent/CN113835372B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1854964A1 (en) * | 2006-05-10 | 2007-11-14 | Siemens Aktiengesellschaft | Use of the steam turbine for primary frequency control in power generating plants |
| CN102646980A (en) * | 2012-04-12 | 2012-08-22 | 山东电力研究院 | Novel primary frequency-modulation compensation control method of unit thermal generator set |
| CN105627291A (en) * | 2014-12-01 | 2016-06-01 | 安阳方快锅炉有限公司 | Variable-frequency water supply control method for steam boiler |
| CN109343409A (en) * | 2018-10-30 | 2019-02-15 | 华能国际电力股份有限公司福州电厂 | A kind of supplementary controlled system and method for full admission unit primary frequency modulation |
| CN112467805A (en) * | 2020-12-10 | 2021-03-09 | 华能威海发电有限责任公司 | Double-asynchronous feedback thermal power generation primary and secondary frequency modulation comprehensive optimization system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113835372A (en) | 2021-12-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113835372B (en) | Control system and method for electrode type electric boiler to assist primary frequency modulation of thermal power generating unit | |
| CN101431310B (en) | Coordination control method for circulating fluidized bed generator set | |
| CN105888744B (en) | The thermal power plant unit control method of main steam pressure deviation is compensated using heat supply network accumulation of energy | |
| CN105180135A (en) | Unit plant coordination control method and system | |
| Zholtayev et al. | Adaptive super-twisting sliding mode control for maximum power point tracking of PMSG-based wind energy conversion systems | |
| WO2022062145A1 (en) | Flexible coordination control method for thermal power unit suitable for deep peak regulation operation | |
| CN103499102B (en) | Method for directional control of fuel quantity of entering boiler of thermal generator set | |
| CN103133319A (en) | Frequency converting control method and system of condensate pump of condensed steam generator set | |
| CN111308886A (en) | Coal-fired unit coordination control method and system | |
| CN109378833B (en) | Method for realizing rapid frequency modulation of unit by controlling steam extraction amount of steam turbine | |
| CN112648029B (en) | Coordinated control optimization method for deep peak regulation working condition of thermal power plant | |
| CN112596394A (en) | Coordinated control method and system for adjusting electricity and heat loads of cogeneration unit | |
| CN109884889A (en) | A kind of dynamic Feedforward control method improving Thermal generation unit coordinated control system regulation quality | |
| CN110716425B (en) | Electric heat coordination control method for cogeneration unit | |
| CN106054591A (en) | Universal load control method for combustion-gas/steam combined cycle set | |
| CN110690711A (en) | Unit load instruction logic regulation and control method based on AGC mode | |
| CN113093544B (en) | Flexible coordination control method for external steam supply unit | |
| CN116667383B (en) | Heat pump and low-adding coupling thermal power generating unit frequency modulation system and method | |
| CN216281315U (en) | Main steam temperature optimization control device of double-slag-chamber coal-fired unit | |
| CN113654036B (en) | Coal-fired unit superheated steam temperature setting self-adaptive optimization method | |
| Pati et al. | Performance Comparison of Fuzzy Gain Scheduling based LFC Controller in Deregulated AGC of a Multi Area System Incorporating Wind Energy | |
| CN114879480A (en) | Steam turbine main control auxiliary pressure regulating control system and control method under variable load working condition | |
| CN111794820B (en) | Organic Rankine cycle system | |
| RU2783040C1 (en) | Frequency control method in an autonomous power system, including an electrical energy storage system | |
| Choudhary et al. | Comparative Study of Load Frequency Control using PID and Fuzzy-PID Controller in Power System |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |