A power frequency modulation unit variable load feedforward intelligent adjustment control method, system, terminal equipment and storage medium

Abstract

This invention discloses a method, system, terminal equipment, and storage medium for intelligent load feedforward regulation and control of generating units under power frequency regulation, belonging to the field of intelligent control technology for thermal power units. The method extracts the dynamic change trend of the unit load command through inertial filtering and difference calculation, and generates a basic feedforward quantity by combining intelligent switching of boiler-turbine coordination state with function mapping; it acquires load change and deviation signals, performs operating condition judgment and branch switching through dynamic ratio calculation, function transformation, and delay identification logic, and outputs a dynamic correction coefficient; it adjusts the gain and performs bidirectional function transformation on the main steam pressure deviation, performs condition discrimination and cascade switching based on the positive and negative intervals of the load deviation, and outputs a pressure coupling correction quantity; it multiplies and couples the dynamic correction coefficient and the pressure coupling correction quantity, and then multiplies it twice with the basic feedforward quantity to synthesize an intelligent load feedforward control signal. This invention overcomes feedback lag and achieves command advance tracking and fast frequency regulation performance.

Description

Technical Field

[0001] This invention belongs to the field of intelligent control technology for thermal power units, specifically relating to an intelligent regulation and control method, system, terminal equipment, and storage medium for load feedforward of generating units under power frequency regulation. Background Technology

[0002] As the "dual carbon" target continues to advance, my country's power system is accelerating its transformation into a new type of power system with a high proportion of new energy sources and high power electronics. The installed capacity of new energy sources such as wind power and photovoltaics is constantly increasing, but their output has significant randomness, fluctuation and intermittency, which significantly increases the difficulty of grid frequency regulation. This places more stringent technical requirements on the response speed, regulation accuracy and load change flexibility of conventional thermal power units, gas turbine units and other frequency-regulating power sources.

[0003] The current standards for primary and secondary frequency regulation (AGC) in the power grid are becoming increasingly stringent, requiring generating units to have the capabilities for rapid ramp-up, deep peak shaving, and frequent bidirectional load changes. Traditional unit coordinated control systems mostly adopt feedback regulation with PID as the core, supplemented by feedforward compensation with fixed parameters. While they can maintain basic stability under steady-state conditions, they have significant shortcomings in scenarios with rapid load changes: feedback control has inherent lag, making it difficult to quickly track frequency regulation commands, and is prone to problems such as large load tracking deviations and untimely responses.

[0004] In existing new power systems with a high proportion of renewable energy grid connection, conventional units suffer from technical defects in load regulation, such as slow response, poor adaptability to changing operating conditions, large fluctuations in main parameters, and insufficient regulation accuracy. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the present invention aims to provide a method, system, terminal equipment and storage medium for intelligent regulation and control of unit load feedforward under power frequency regulation.

[0006] To achieve the above objectives, the present invention employs the following technical solution: In a first aspect, the present invention provides a method for intelligent regulation and control of generator unit under variable load under power frequency regulation, comprising the following steps: S1: Obtain the unit load command signal before primary frequency regulation, extract the dynamic change trend of the load through inertial filtering and difference calculation, and combine it with the coordinated operation status of the boiler and turbine to perform intelligent switching and function mapping, and generate the basic feedforward quantity of the coordination mode; S2: Acquire unit load change signal and load deviation signal, perform dynamic ratio calculation and function transformation, combine load change direction and delay identification logic to perform operating condition judgment and branch switching, and output variable load dynamic correction coefficient; S3: Acquire the main steam pressure deviation signal, and after gain adjustment and bidirectional function transformation, perform condition discrimination and cascade switching according to the positive and negative intervals of the load deviation, and output the pressure coupling correction amount; S4: Multiply and couple the variable load dynamic correction coefficient with the pressure coupling correction amount, and then multiply it again with the coordination mode basic feedforward amount to synthesize an intelligent variable load feedforward control signal and output it to the unit control system.

[0007] Furthermore, step S1 specifically includes: The unit load command signal before primary frequency regulation is input to the first-order inertial module for first-order inertial time calculation, and the output value of the first-order inertial module is obtained. The unit load command signal before primary frequency regulation and the output value of the first first-order inertial module are input to the second subtraction module for difference calculation to obtain the output value of the second subtraction module; The furnace-machine coordination mode signal, the output value of the second subtraction module, and the output value of the second constant module are respectively input to the enable trigger terminal, Y terminal, and N terminal of the first switching module. When the furnace-machine coordination mode signal output is the first threshold, the first switching module uses the output value of the second subtraction module as the output value. When the output is the second threshold, the first switching module uses the output value of the second constant module as the output value. The output value of the first switching module is input to the fifth function module for function mapping to obtain the basic feedforward quantity of the coordination method.

[0008] Furthermore, step S2 specifically includes: The unit load change signal and the output value of the first constant module are input to the first large selection module for comparison and calculation, and the larger value is selected as the output value of the first large selection module. The target load setpoint and the unit load command signal before primary frequency regulation are input to the first subtraction module for difference calculation to obtain the load deviation signal; The output value of the first selection module and the load deviation signal are input to the first division module for ratio calculation to obtain the output value of the first division module; The output value of the first division module is input into the third and fourth function modules respectively for function transformation; The load deviation signal is sequentially input to the first comparison module and the first interruption delay module for delay identification, and the output value of the first interruption delay module is obtained. The third switching module is controlled to switch between the output values ​​of the third function module and the fourth function module based on the output value of the first delay module. When the output value of the first delay module is a first threshold, the third switching module outputs the output value of the fourth function module. When the output value is a second threshold, the third function module outputs the output value of the third function module, thus obtaining the variable load dynamic correction coefficient.

[0009] Furthermore, step S3 specifically includes: The main steam pressure deviation signal is input to the first gain coefficient module to calculate the gain coefficient, and the output value of the first gain coefficient module is obtained. The output value of the first gain coefficient module is input into the first function module and the second function module respectively to perform bidirectional function transformation; The load deviation signal is input to the first greater than comparison module and the first less than comparison module respectively for positive and negative threshold discrimination; When the output value of the first greater than comparison module is the first threshold, the second switching module uses the output value of the first function module as the output value; when the output value is the second threshold, the second switching module uses the output value of the third constant module as the output value. When the output value of the first less-than comparison module is the first threshold, the fourth switching module uses the output value of the second function module as the output value. When the output value is the second threshold, the fourth switching module uses the output value of the second switching module as the output value, thus obtaining the pressure coupling correction amount.

[0010] Furthermore, step S4 specifically includes: The variable load dynamic correction coefficient and the pressure coupling correction amount are input into the first multiplication module for multiplication calculation to obtain the output value of the first multiplication module; The basic feedforward quantity of the coordination method and the output value of the first multiplication module are input into the second multiplication module for a second multiplication operation to obtain the output value of the second multiplication module; The output value of the second multiplication module is input to the intelligent variable load feedforward module, and the intelligent variable load feedforward control signal is output.

[0011] Secondly, the present invention provides an intelligent regulation and control system for variable load feedforward of generating units under power frequency regulation, comprising: The signal acquisition unit is used to acquire the unit load command signal before primary frequency regulation, the unit load change signal, the target load setpoint, the main steam pressure deviation signal, and the boiler-turbine coordination mode signal. The trend extraction and coordination feedforward unit is communicatively connected to the signal acquisition unit. It is used to perform inertial filtering and difference calculation to extract the dynamic change trend of the load, and to perform intelligent switching and function mapping in combination with the coordinated operation status of the boiler and turbine to generate the basic feedforward quantity of the coordination mode. The operating condition identification and dynamic correction unit is communicatively connected to the signal acquisition unit. It is used to acquire the unit load change signal, and perform a difference calculation between the target load setpoint and the unit load command before the first frequency regulation signal to obtain the load deviation signal. After dynamic ratio calculation and function transformation, it combines the load change direction and delay identification logic to perform operating condition judgment and branch switching, and outputs the variable load dynamic correction coefficient. The pressure decoupling and bidirectional limiting unit is communicatively connected to the signal acquisition unit. It is used to acquire the main steam pressure deviation signal and perform gain adjustment and bidirectional function transformation. At the same time, it performs condition discrimination and cascade switching based on the positive and negative intervals of the load deviation signal and outputs the pressure coupling correction amount. The feedforward synthesis and output unit is communicatively connected to the trend extraction and coordination feedforward unit, the operating condition identification and dynamic correction unit, and the pressure decoupling and bidirectional limiting unit, respectively. It is used to multiply and couple the variable load dynamic correction coefficient with the pressure coupling correction amount, and then perform a second multiplication operation with the coordination mode basic feedforward amount to synthesize an intelligent variable load feedforward control signal and output it to the unit control system.

[0012] Thirdly, the present invention provides a power frequency regulation unit load feedforward intelligent regulation and control device, comprising: a signal input interface for receiving unit load command before primary frequency regulation signal, unit load change signal, target load set value, main steam pressure deviation signal and boiler-turbine coordination mode signal; And the first first-order inertial module, the first subtraction module, the second subtraction module, the first large selection module, the first constant module, the second constant module, the third constant module, the first gain coefficient module, the first function module, the second function module, the third function module, the fourth function module, the fifth function module, the first division module, the first comparison module, the first greater than comparison module, the first less than comparison module, the first time-delay module, the first switching module, the second switching module, the third switching module, the fourth switching module, the first multiplication module, the second multiplication module, and the intelligent variable load feedforward module; in, The unit load command signal before the first frequency regulation is respectively connected to the first first-order inertial module and the second subtraction module; the output of the first first-order inertial module is connected to the second subtraction module. The target load setpoint and the unit load command signal before the first frequency regulation are both connected to the first subtraction module; The furnace-machine coordination mode signal, the output of the second subtraction module, and the output of the second constant module are respectively connected to the enable trigger terminal, the Y terminal, and the N terminal of the first switching module; the output of the first switching module is connected to the fifth function module. The unit load change signal and the first constant module are both connected to the first general election module; the output of the first general election module and the output of the first subtraction module are both connected to the first division module. The first division module is connected to the third function module and the fourth function module respectively; The output of the first subtraction module is also connected to the first comparison module, the first greater than comparison module, and the first less than comparison module, respectively; the output of the first comparison module is connected to the first timeout module; the output of the first timeout module, the output of the fourth function module, and the output of the third function module are respectively connected to the enable trigger terminal, the Y terminal, and the N terminal of the third switching module. The main steam pressure deviation signal is connected to the first gain coefficient module; the output of the first gain coefficient module is respectively connected to the first function module and the second function module. The output terminals of the first greater than comparison module, the first function module, and the third constant module are respectively connected to the enable trigger terminal, the Y terminal, and the N terminal of the second switching module. The output terminals of the first less-than comparison module, the second function module, and the second switching module are respectively connected to the enable trigger terminal, the Y terminal, and the N terminal of the fourth switching module. The output terminals of the third and fourth switching modules are both connected to the first multiplication module; the output terminals of the fifth function module and the first multiplication module are both connected to the second multiplication module; and the output terminal of the second multiplication module is connected to the intelligent variable load feedforward module.

[0013] Fourthly, the present invention provides a terminal device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement any one of the steps in the above-described intelligent regulation and control method for variable load feedforward of generating units under power frequency regulation.

[0014] Fifthly, the present invention also provides a computer storage medium having a computer program stored thereon. When the computer program is executed by the processor, it implements any one of the steps in the above-described intelligent regulation and control method for unit load shifting under power frequency regulation.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This invention accurately extracts the dynamic trend of load changes through inertial filtering and difference calculation, and combines intelligent switching and function mapping with the coordinated operation status of the boiler and turbine, effectively overcoming the inherent lag of traditional feedback control and realizing the advanced action of feedforward compensation. It utilizes large selection, division, and time-delay logic to perform dynamic ratio calculation and function transformation on the load change signal and load deviation, accurately identifying the direction of variable load conditions and realizing branch switching, outputting a dynamic correction coefficient that highly matches the actual variable load characteristics, avoiding overshoot or undershoot problems of fixed feedforward parameters in frequent frequency adjustment scenarios. Furthermore, it adjusts the gain and dual... By transforming the function and performing conditional discrimination and cascading switching based on the positive and negative intervals of load deviation, the pressure fluctuation trend can be captured in real time and compensated in reverse, effectively smoothing out the drastic fluctuations in main steam pressure during rapid load changes. Finally, the dynamic correction coefficient, pressure coupling correction amount and coordination mode basic feedforward amount are multiplied and coupled and subjected to secondary calculation, so that the feedforward amount can be automatically scaled according to the group operation boundary, realizing multi-condition adaptive and precise feedforward, which significantly improves the unit's response speed, tracking accuracy and main parameter stability to frequency regulation commands, and fully meets the core requirements of the new power system for deep peak shaving and rapid frequency regulation of thermal power units. Attached Figure Description

[0016] Figure 1 A flowchart illustrating an intelligent regulation and control method for variable load feedforward of generating units under power frequency regulation provided by the present invention; Figure 2 A schematic diagram of load tracking and main parameter control curves in the frequency regulation process of a unit under varying load, provided by the present invention; Figure 3 A flowchart illustrating an intelligent regulation and control system for variable load feedforward of generating units under power frequency regulation provided by the present invention; Figure 4 This invention provides a structural schematic diagram of a power unit variable load feedforward intelligent regulation and control device.

[0017] Wherein: 001-Unit load command signal before primary frequency regulation; 002-Unit load change signal; 003-Target load setpoint; 004-Main steam pressure deviation signal; 005-First-order inertia module; 006-First-order large-scale module; 007-First constant module; 008-First subtraction module; 009-First gain coefficient module; 010-First function module; 011-Second function module; 012-Second subtraction module; 013-Boiler-turbine coordination mode signal; 014-Second constant module; 015- First switching module; 016-First division module; 017-Second switching module; 018-First greater than comparison module; 019-Third constant module; 020-Third function module; 021-Fourth function module; 022-First comparison module; 023-First less than comparison module; 024-First timeout module; 025-Fifth function module; 026-Third switching module; 027-Fourth switching module; 028-First multiplication module; 029-Second multiplication module; 030-Intelligent variable load feedforward module. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0019] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0020] The present invention will now be described in further detail with reference to the accompanying drawings: Example 1 Combination Figure 1-2 As shown, this embodiment provides a method for intelligent regulation and control of generating units under variable load under power frequency regulation. This method includes the following steps: Step S1: Obtain the unit load command signal before primary frequency regulation, extract the dynamic change trend of the load through inertial filtering and difference calculation, and combine it with the coordinated operation status of the boiler and turbine to perform intelligent switching and function mapping to generate the basic feedforward quantity of the coordination mode.

[0021] Specifically, the unit load command pre-frequency regulation signal 001 is input to the first first-order inertial module 005 for first-order inertial time calculation to obtain the output value of the first first-order inertial module 005; the unit load command pre-frequency regulation signal 001 and the output value of the first first-order inertial module 005 are input to the second subtraction module 012 for difference calculation to obtain the output value of the second subtraction module 012; the boiler-turbine coordination mode signal 013, the output value of the second subtraction module 012, and the output value of the second constant module 014 are respectively input to the enable trigger terminal, Y terminal, and N terminal of the first switching module 015; when the boiler-turbine coordination mode signal 013 outputs a first threshold, the first switching module 015 switches to the Y terminal and outputs the output value of the second subtraction module 012; when the output is a second threshold, the first switching module 015 switches to the N terminal and outputs the value of the second constant module 014; the output value of the first switching module 015 is input to the fifth function module 025 for function mapping to obtain the basic feedforward quantity of the coordination mode.

[0022] Step S2: Obtain the unit load change signal and load deviation signal, perform dynamic ratio calculation and function transformation, and combine the load change direction and delay identification logic to determine the operating condition and switch branches, and output the variable load dynamic correction coefficient.

[0023] Specifically, the unit load change signal 002 and the output value of the first constant module 007 are input to the first general selection module 006 for general selection comparison calculation, and the larger value is selected as the output value of the first general selection module 006; the target load set value 003 and the unit load command primary frequency regulation signal 001 are input to the first subtraction module 008 for difference calculation to obtain the load deviation signal; The output value of the first selection module 006 and the load deviation signal are input to the first division module 016, where the first division module 016 performs division calculations to obtain the output value of the first division module 016; the output value of the first division module 016 is then input to the third function module 020 and the fourth function module 021, where the third function module 020 and the fourth function module 021 respectively perform function transformation calculations on the input values; The load deviation signal is sequentially input to the first comparison module 022 and the first time-delay module 024. The first comparison module 022 performs comparison calculations, and the first time-delay module 024 performs time-delay calculations to obtain the output value of the first time-delay module 024. The output value of the first time-delay module 024, the output value of the fourth function module 021, and the output value of the third function module 020 are respectively connected to the enable trigger terminal, the Y terminal, and the N terminal of the third switching module 026. When the output value of the first time-delay module 024 is the first threshold, the third switching module 026 switches to the Y terminal and outputs the output value of the fourth function module 021. When the output value is the second threshold, the third switching module 026 switches to the N terminal and outputs the output value of the third function module 020 to obtain the variable load dynamic correction coefficient.

[0024] Step S3: Obtain the main steam pressure deviation signal, and after gain adjustment and bidirectional function transformation, perform condition discrimination and cascade switching according to the positive and negative intervals of the load deviation, and output the pressure coupling correction amount.

[0025] Specifically, the main steam pressure deviation signal 004 is input to the first gain coefficient module 009, whereby the first gain coefficient module 009 calculates the gain coefficient to obtain the output value of the first gain coefficient module 009; the output value of the first gain coefficient module 009 is then input to the first function module 010 and the second function module 011, whereby the first function module 010 and the second function module 011 perform bidirectional function transformation calculations respectively; The load deviation signal is input to the first greater than comparison module 018, which performs a greater than comparison calculation. The output values ​​of the first greater than comparison module 018, the first function module 010, and the third constant module 019 are respectively connected to the enable trigger terminal, Y terminal, and N terminal of the second switching module 017. When the output value of the first greater than comparison module 018 is a first threshold, the second switching module 017 switches to the Y terminal and outputs the output value of the first function module 010. When the output value is a second threshold, the second switching module 017 switches to the N terminal and outputs the value of the third constant module 019. The load deviation is then... The signal is input to the first less-than comparison module 023, which performs a less-than comparison calculation. The output values ​​of the first less-than comparison module 023, the second function module 011, and the second switching module 017 are respectively connected to the enable trigger terminal, the Y terminal, and the N terminal of the fourth switching module 027. When the output value of the first less-than comparison module 023 is the first threshold, the fourth switching module 027 switches to the Y terminal and outputs the output value of the second function module 011. When the output value is the second threshold, the fourth switching module 027 switches to the N terminal and outputs the output value of the second switching module 017, thus obtaining the pressure coupling correction amount.

[0026] Step S4: Multiply and couple the variable load dynamic correction coefficient with the pressure coupling correction amount, and then multiply it again with the coordination mode basic feedforward amount to synthesize an intelligent variable load feedforward control signal and output it to the unit control system.

[0027] Specifically, the variable load dynamic correction coefficient (i.e., the output value of the third switching module 026) and the pressure coupling correction amount (i.e., the output value of the fourth switching module 027) are input to the first multiplication module 028, where the first multiplication module 028 performs multiplication calculations to obtain the output value of the first multiplication module 028; the coordination mode basic feedforward amount (i.e., the output value of the fifth function module 025) and the output value of the first multiplication module 028 are input to the second multiplication module 029, where the second multiplication module 029 performs a second multiplication operation to obtain the output value of the second multiplication module 029; the output value of the second multiplication module 029 is input to the intelligent variable load feedforward module 030 to output the intelligent variable load feedforward control signal.

[0028] The inertial time constant of the first first-order inertial module 005 is configured in the range of 0 to 60, with the unit being seconds (s); the delay time of the first discontinuation delay module 024 is also configured in the range of 0 to 60, with the unit being seconds (s).

[0029] In this embodiment, the first threshold is set to 1 and the second threshold is set to 0.

[0030] When applying the method provided in this embodiment, adaptive feedforward compensation under varying load conditions is achieved during unit operation control: such as Figure 2 As shown, within a wide load range (approximately 550-1020MW), the optimized system exhibits significant advantages compared to the unoptimized system. Faster dynamic response: During load fluctuations, the optimized load tracking more closely follows the command curve, with smaller peak / valley response lag and a significantly improved load change rate; smaller steady-state deviation: The optimized system narrows load fluctuations throughout the entire time period, and controls related parameters such as main steam pressure more smoothly, avoiding overshoot and oscillations caused by fixed feedforward parameters; stronger adaptability: The system automatically switches control strategies based on the boiler-turbine coordination status and load change rate, meeting the core requirements of new power systems for deep peak shaving and rapid frequency regulation.

[0031] Example 2 Combination Figure 3 As shown, this embodiment provides an intelligent regulation and control system for unit load shifting under power frequency regulation, including: The signal acquisition unit is used to acquire the unit load command signal before primary frequency regulation, the unit load change signal, the target load setpoint, the main steam pressure deviation signal, and the boiler-turbine coordination mode signal. The trend extraction and coordination feedforward unit is communicatively connected to the signal acquisition unit. It is used to perform inertial filtering and difference calculation to extract the dynamic change trend of the load, and to perform intelligent switching and function mapping in combination with the coordinated operation status of the boiler and turbine to generate the basic feedforward quantity of the coordination mode. The operating condition identification and dynamic correction unit is communicatively connected to the signal acquisition unit. It is used to acquire the unit load change signal, and perform a difference calculation between the target load setpoint and the unit load command before the first frequency regulation signal to obtain the load deviation signal. After dynamic ratio calculation and function transformation, it combines the load change direction and delay identification logic to perform operating condition judgment and branch switching, and outputs the variable load dynamic correction coefficient. The pressure decoupling and bidirectional limiting unit is communicatively connected to the signal acquisition unit. It is used to acquire the main steam pressure deviation signal and perform gain adjustment and bidirectional function transformation. At the same time, it performs condition discrimination and cascade switching based on the positive and negative intervals of the load deviation signal and outputs the pressure coupling correction amount. The feedforward synthesis and output unit is communicatively connected to the trend extraction and coordination feedforward unit, the operating condition identification and dynamic correction unit, and the pressure decoupling and bidirectional limiting unit, respectively. It is used to multiply and couple the variable load dynamic correction coefficient with the pressure coupling correction amount, and then perform a second multiplication operation with the coordination mode basic feedforward amount to synthesize an intelligent variable load feedforward control signal and output it to the unit control system.

[0032] Through the coordinated operation of the aforementioned functional units, the system architecture of this embodiment can efficiently integrate control logics such as load dynamic trend extraction, adaptive identification of variable load conditions, main steam pressure decoupling compensation, and feedforward multiplication synthesis. In actual unit frequency regulation operation, this system can automatically match control strategies based on real-time operating boundaries, effectively overcoming the inherent lag of traditional feedback control, suppressing drastic fluctuations in main parameters during rapid load changes, and achieving precise and proactive adjustment of feedforward compensation. This significantly improves the unit's tracking quality of grid frequency regulation commands, load change flexibility, and long-term operational safety.

[0033] Example 3 Combination Figure 4 As shown, this embodiment provides a novel intelligent regulation and control device for unit load shifting under power frequency regulation, including: a signal input interface for receiving unit load command before primary frequency regulation signal 001, unit load change signal 002, target load setpoint 003, main steam pressure deviation signal 004, and boiler-turbine coordination mode signal 013. And the first first-order inertial module 005, the first subtraction module 008, the second subtraction module 012, the first large selection module 006, the first constant module 007, the second constant module 014, the third constant module 019, the first gain coefficient module 009, the first function module 010, the second function module 011, the third function module 020, the fourth function module 021, the fifth function module 025, the first division module 016, the first comparison module 022, the first greater than comparison module 018, the first less than comparison module 023, the first time-delay module 024, the first switching module 015, the second switching module 017, the third switching module 026, the fourth switching module 027, the first multiplication module 028, the second multiplication module 029, and the intelligent variable load feedforward module 030; in, The unit load command signal 001 before the first frequency adjustment is connected to the first first-order inertial module 005 and the second subtraction module 012 respectively; the output of the first first-order inertial module 005 is connected to the second subtraction module 012. The target load setpoint 003 and the unit load command signal 001 before primary frequency regulation are both connected to the first subtraction module 008; The furnace-machine coordination mode signal 013, the output terminal of the second subtraction module 012, and the second constant module 014 are respectively connected to the enable trigger terminal, Y terminal, and N terminal of the first switching module 015; the output terminal of the first switching module 015 is connected to the fifth function module 025; The unit load change signal 002 and the first constant module 007 are both connected to the first general election module 006; the output terminal of the first general election module 006 and the output terminal of the first subtraction module 008 are both connected to the first division module 016. The first division module 016 is connected to the third function module 020 and the fourth function module 021 respectively; The output of the first subtraction module 008 is also connected to the first comparison module 022, the first greater than comparison module 018, and the first less than comparison module 023, respectively; the output of the first comparison module 022 is connected to the first timeout module 024; the output of the first timeout module 024, the output of the fourth function module 021, and the output of the third function module 020 are respectively connected to the enable trigger terminal, the Y terminal, and the N terminal of the third switching module 026. The main steam pressure deviation signal 004 is connected to the first gain coefficient module 009; the output of the first gain coefficient module 009 is respectively connected to the first function module 010 and the second function module 011. The output terminals of the first greater than comparison module 018, the first function module 010, and the third constant module 019 are respectively connected to the enable trigger terminal, the Y terminal, and the N terminal of the second switching module 017. The output terminals of the first less-than comparison module 023, the second function module 011, and the second switching module 017 are respectively connected to the enable trigger terminal, the Y terminal, and the N terminal of the fourth switching module 027. The output terminals of the third switching module 026 and the fourth switching module 027 are both connected to the first multiplication module 028; the output terminals of the fifth function module 025 and the first multiplication module 028 are both connected to the second multiplication module 029; and the output terminal of the second multiplication module 029 is connected to the intelligent variable load feedforward module 030.

[0034] The device architecture adopted in this embodiment enables the coordinated operation of various control modules, which can efficiently complete the dynamic feature extraction of load commands, accurate identification of variable load conditions, bidirectional decoupling compensation of main steam pressure and multiplication and coupling synthesis of feedforward quantities. This effectively achieves smooth transition and seamless switching of commands under different frequency regulation conditions. Under the premise of ensuring the safety and stability of the unit's main parameters, it significantly improves the dynamic response quality and operational economy of the system under complex power grid frequency regulation requirements.

[0035] Example 4 This embodiment provides a terminal device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the method steps as described in Embodiment 1.

[0036] Example 5 This embodiment provides a computer storage medium on which a computer program is stored. When the computer program is executed by the processor, it implements the method steps as described in Example 1.

[0037] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A method for intelligent regulation and control of generating units under variable load under power frequency regulation, characterized in that: Includes the following steps: S1: Obtain the unit load command signal before primary frequency regulation, extract the dynamic change trend of the load through inertial filtering and difference calculation, and combine it with the coordinated operation status of the boiler and turbine to perform intelligent switching and function mapping, and generate the basic feedforward quantity of the coordination mode; S2: Acquire unit load change signal and load deviation signal, perform dynamic ratio calculation and function transformation, combine load change direction and delay identification logic to determine operating condition and switch branches, and output variable load dynamic correction coefficient; S3: Acquire the main steam pressure deviation signal, and after gain adjustment and bidirectional function transformation, perform condition discrimination and cascade switching according to the positive and negative intervals of the load deviation, and output the pressure coupling correction amount; S4: Multiply and couple the variable load dynamic correction coefficient with the pressure coupling correction amount, and then multiply it again with the coordination mode basic feedforward amount to synthesize an intelligent variable load feedforward control signal and output it to the unit control system.

2. The intelligent regulation and control method for unit load shifting under power frequency regulation according to claim 1, characterized in that: Step S1 specifically includes: The unit load command signal before primary frequency regulation is input to the first-order inertial module for first-order inertial time calculation, and the output value of the first-order inertial module is obtained. The unit load command signal before primary frequency regulation and the output value of the first first-order inertial module are input to the second subtraction module for difference calculation to obtain the output value of the second subtraction module; The furnace-machine coordination mode signal, the output value of the second subtraction module, and the output value of the second constant module are respectively input to the enable trigger terminal, Y terminal, and N terminal of the first switching module. When the furnace-machine coordination mode signal output is the first threshold, the first switching module uses the output value of the second subtraction module as the output value. When the output is the second threshold, the first switching module uses the output value of the second constant module as the output value. The output value of the first switching module is input to the fifth function module for function mapping to obtain the basic feedforward quantity of the coordination method.

3. The intelligent regulation and control method for unit load shifting under power frequency regulation according to claim 2, characterized in that: Step S2 specifically includes: The unit load change signal and the output value of the first constant module are input to the first large selection module for comparison and calculation, and the larger value is selected as the output value of the first large selection module. The target load setpoint and the unit load command signal before primary frequency regulation are input to the first subtraction module for difference calculation to obtain the load deviation signal; The output value of the first selection module and the load deviation signal are input to the first division module for ratio calculation to obtain the output value of the first division module; The output value of the first division module is input into the third and fourth function modules respectively for function transformation; The load deviation signal is sequentially input to the first comparison module and the first interruption delay module for delay identification, and the output value of the first interruption delay module is obtained. The third switching module is controlled to switch between the output values ​​of the third function module and the fourth function module based on the output value of the first delay module. When the output value of the first delay module is a first threshold, the third switching module outputs the output value of the fourth function module. When the output value is a second threshold, the third function module outputs the output value of the third function module, thus obtaining the variable load dynamic correction coefficient.

4. The intelligent regulation and control method for unit load shifting under power frequency regulation according to claim 3, characterized in that: Step S3 specifically includes: The main steam pressure deviation signal is input to the first gain coefficient module to calculate the gain coefficient, and the output value of the first gain coefficient module is obtained. The output value of the first gain coefficient module is input into the first function module and the second function module respectively to perform bidirectional function transformation; The load deviation signal is input to the first greater than comparison module and the first less than comparison module respectively for positive and negative threshold discrimination; When the output value of the first greater than comparison module is the first threshold, the second switching module uses the output value of the first function module as the output value; when the output value is the second threshold, the second switching module uses the output value of the third constant module as the output value. When the output value of the first less-than comparison module is the first threshold, the fourth switching module uses the output value of the second function module as the output value. When the output value is the second threshold, the fourth switching module uses the output value of the second switching module as the output value, thus obtaining the pressure coupling correction amount.

5. The intelligent regulation and control method for unit load shifting under power frequency regulation according to claim 4, characterized in that: Step S4 specifically includes: The variable load dynamic correction coefficient and the pressure coupling correction amount are input into the first multiplication module for multiplication calculation to obtain the output value of the first multiplication module; The basic feedforward quantity of the coordination method and the output value of the first multiplication module are input into the second multiplication module for a second multiplication operation to obtain the output value of the second multiplication module; The output value of the second multiplication module is input to the intelligent variable load feedforward module, and the intelligent variable load feedforward control signal is output.

6. A power unit load-feedforward intelligent regulation and control system under power frequency regulation, characterized in that, include: The signal acquisition unit is used to acquire the unit load command signal before primary frequency regulation, the unit load change signal, the target load setpoint, the main steam pressure deviation signal, and the boiler-turbine coordination mode signal. The trend extraction and coordination feedforward unit is communicatively connected to the signal acquisition unit. It is used to perform inertial filtering and difference calculation to extract the dynamic change trend of the load, and to perform intelligent switching and function mapping in combination with the coordinated operation status of the boiler and turbine to generate the basic feedforward quantity of the coordination mode. The operating condition identification and dynamic correction unit is communicatively connected to the signal acquisition unit. It is used to acquire the unit load change signal, and perform a difference calculation between the target load setpoint and the unit load command before the first frequency regulation signal to obtain the load deviation signal. After dynamic ratio calculation and function transformation, it combines the load change direction and delay identification logic to perform operating condition judgment and branch switching, and outputs the variable load dynamic correction coefficient. The pressure decoupling and bidirectional limiting unit is communicatively connected to the signal acquisition unit. It is used to acquire the main steam pressure deviation signal and perform gain adjustment and bidirectional function transformation. At the same time, it performs condition discrimination and cascade switching based on the positive and negative intervals of the load deviation signal and outputs the pressure coupling correction amount. The feedforward synthesis and output unit is communicatively connected to the trend extraction and coordination feedforward unit, the operating condition identification and dynamic correction unit, and the pressure decoupling and bidirectional limiting unit, respectively. It is used to multiply and couple the variable load dynamic correction coefficient with the pressure coupling correction amount, and then perform a second multiplication operation with the coordination mode basic feedforward amount to synthesize an intelligent variable load feedforward control signal and output it to the unit control system.

7. A power unit load shifting intelligent regulation and control device under power frequency regulation, characterized in that: It includes a signal input interface for receiving unit load commands, signals before primary frequency regulation, unit load change signals, target load setpoints, main steam pressure deviation signals, and boiler-turbine coordination mode signals. And the first first-order inertial module, the first subtraction module, the second subtraction module, the first large selection module, the first constant module, the second constant module, the third constant module, the first gain coefficient module, the first function module, the second function module, the third function module, the fourth function module, the fifth function module, the first division module, the first comparison module, the first greater than comparison module, the first less than comparison module, the first time-delay module, the first switching module, the second switching module, the third switching module, the fourth switching module, the first multiplication module, the second multiplication module, and the intelligent variable load feedforward module; in, The unit load command signal before the first frequency regulation is respectively connected to the first first-order inertial module and the second subtraction module; the output of the first first-order inertial module is connected to the second subtraction module. The target load setpoint and the unit load command signal before the first frequency regulation are both connected to the first subtraction module; The furnace-machine coordination mode signal, the output of the second subtraction module, and the output of the second constant module are respectively connected to the enable trigger terminal, the Y terminal, and the N terminal of the first switching module; the output of the first switching module is connected to the fifth function module. The unit load change signal and the first constant module are both connected to the first general election module; the output of the first general election module and the output of the first subtraction module are both connected to the first division module. The first division module is connected to the third function module and the fourth function module respectively; The output of the first subtraction module is also connected to the first comparison module, the first greater than comparison module, and the first less than comparison module, respectively; the output of the first comparison module is connected to the first timeout module; the output of the first timeout module, the output of the fourth function module, and the output of the third function module are respectively connected to the enable trigger terminal, the Y terminal, and the N terminal of the third switching module. The main steam pressure deviation signal is connected to the first gain coefficient module; the output of the first gain coefficient module is respectively connected to the first function module and the second function module. The output terminals of the first greater than comparison module, the first function module, and the third constant module are respectively connected to the enable trigger terminal, the Y terminal, and the N terminal of the second switching module. The output terminals of the first less-than comparison module, the second function module, and the second switching module are respectively connected to the enable trigger terminal, the Y terminal, and the N terminal of the fourth switching module. The output terminals of the third and fourth switching modules are both connected to the first multiplication module; the output terminals of the fifth function module and the first multiplication module are both connected to the second multiplication module; and the output terminal of the second multiplication module is connected to the intelligent variable load feedforward module.

8. A terminal device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, it implements the steps of the method as described in any one of claims 1-5.

9. A computer storage medium, characterized in that: It contains computer programs. When the computer program is executed by a processor, it implements the steps of the method as described in any one of claims 1-5.

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