Variable frequency power frequency pump improves wide load response method, system, device and medium
By implementing hierarchical control commands and safety interlock protection mechanisms, the slow response and safety issues of variable frequency pump systems under wide load conditions have been resolved, achieving thermodynamic stability and equipment safety of the unit during rapid adjustment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- XIAN THERMAL POWER RES INST CO LTD
- Filing Date
- 2026-04-29
- Publication Date
- 2026-06-12
AI Technical Summary
The existing variable frequency and power frequency parallel circulating water system has a slow frequency response when dealing with rapid and wide load increases of the unit, which leads to drastic fluctuations in condenser vacuum and equipment safety exceeding limits.
By jointly judging multiple parameters, hierarchical control commands are generated, and hierarchical interventions are precisely executed, including frequency conversion and frequency reduction followed by power frequency interruption. Load deviations are calculated simultaneously to coordinate boiler and turbine commands, combined with a safety interlock protection mechanism.
It improves the response dead zone of the variable frequency pump, prevents the vacuum degree from deteriorating sharply due to cooling water interruption, and achieves a balance between ultra-fast response and equipment operation safety under wide load conditions.
Smart Images
Figure CN122191059A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of improving the flexibility of coal-fired power units, and in particular to a method, system, equipment and medium for improving wide load response using a variable frequency pump. Background Technology
[0002] During generator unit operation, the circulating water pump system is responsible for continuously supplying cooling water to the condenser, and its cooling water flow rate directly determines the condenser vacuum level. Condenser vacuum level is a key thermodynamic parameter affecting the turbine's work capacity and the overall output of the unit. With the increasing frequency of automatic generation control (AGC) dispatch commands, large generator units must possess extremely high load regulation rates and transient response capabilities under wide load operating conditions. To balance energy-saving requirements and cooling water supply across different load ranges, the circulating water systems of current large units generally adopt a parallel operation mode combining variable frequency pumps and fixed frequency pumps. During stable operation or periods of minor fluctuations, the frequency of the variable frequency pumps is typically adjusted to change the cooling water flow rate to maintain basic unit operation.
[0003] However, existing parallel control strategies have significant technical limitations when dealing with extreme dispatching demands such as rapid and substantial load increases in generating units (i.e., wide load response). On the one hand, traditional control methods mainly rely on the single frequency adjustment action of variable frequency pumps. Due to the delay in their dynamic response to water flow, when encountering a sudden load surge, even if the variable frequency pump quickly reduces its frequency to its limit, the increased output it releases is insufficient to fill the instantaneous load gap. On the other hand, to forcibly intervene in the vacuum in a short period of time to obtain instantaneous output from the unit, existing technologies often adopt the crude method of directly interrupting the operation of the fixed frequency pump. This discontinuous control lacks rigorous graded condition prediction and is detached from the load coordination mechanism on the unit side. Sudden pump shutdown without synchronous adjustment of boiler and turbine commands can easily lead to severe vacuum deterioration and exhaust steam temperature exceeding limits. In addition, existing logic generally lacks a smooth graded recovery mechanism and safety interlock protection after intervention, making it difficult to ensure the underlying safety of the thermal system while meeting the rapid response of the power grid. Summary of the Invention
[0004] In view of the aforementioned existing problems, the present invention is proposed.
[0005] Therefore, this invention provides a method, system, equipment, and medium for boosting wide-load response using a variable frequency and fixed frequency pump, solving the technical problems of slow frequency response and rough shutdown that easily cause severe condenser vacuum fluctuations and equipment safety exceeding limits in existing variable frequency and fixed frequency parallel circulating water systems when responding to rapid and wide-range load increases from the unit. This invention generates tiered control commands through multi-parameter joint judgment, precisely executing tiered intervention of first reducing the frequency of the variable frequency pump and then interrupting the fixed frequency pump, while simultaneously calculating load deviations to coordinate boiler and turbine commands; after the response ends, it performs orderly tiered recovery, and incorporates a safety interlock protection mechanism based on thermodynamic parameters throughout the process.
[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: In a first aspect, the present invention provides a method for improving the wide-load response of a variable frequency power frequency pump, comprising: The unit operating parameters are assessed for load intervention conditions, and tiered control commands are generated. Based on hierarchical control commands, load intervention is performed on both variable frequency pumps and fixed frequency pumps, and load coordination control is carried out synchronously. Based on preset recovery conditions, graded recovery control is performed on the variable frequency pump and the fixed frequency pump, and safety interlock protection is implemented according to the unit's safety parameters.
[0007] As a preferred embodiment of the variable frequency power frequency pump wide load response method described in this invention, the generation of graded control commands includes: acquiring unit load command parameters, actual load parameters, target load change rate, and circulating water pump status parameters; when the load command parameters are greater than the actual load parameters and the target load change rate is greater than a preset change rate threshold, and in conjunction with the cut-off conditions, generating graded control commands. As a preferred embodiment of the variable frequency and fixed frequency pump wide load response method described in this invention, the load intervention for the variable frequency pump and the fixed frequency pump includes: controlling the variable frequency pump to reduce its frequency to a safe operating frequency; and maintaining the variable frequency pump in continuous operation during the frequency reduction period; when the variable frequency pump reduces its frequency to a safe operating frequency, performing a second reading of the load command parameters and the actual load parameters; if the load command parameters are greater than the actual load parameters, controlling the fixed frequency pump to interrupt operation within a preset time.
[0008] As a preferred embodiment of the variable frequency and fixed frequency pump wide load response method described in this invention, the load intervention of the variable frequency pump and the fixed frequency pump further includes: maintaining the variable frequency pump in safe operating frequency within a preset time during which the fixed frequency pump is interrupted, and controlling the variable frequency pump to deliver circulating cooling water to the condenser.
[0009] As a preferred embodiment of the variable frequency and fixed frequency pump wide load response method described in this invention, the synchronous load coordination control includes: calculating the deviation data between the load command parameters and the actual load parameters during the load intervention period of the variable frequency pump and the fixed frequency pump; and performing load coordination control based on the deviation data to adjust the boiler fuel control command and the turbine regulating valve opening command.
[0010] As a preferred embodiment of the variable frequency pump wide load response method described in this invention, the step of performing graded recovery control includes: controlling the fixed frequency pump to restart when the fixed frequency pump has been interrupted for a preset time and the unit operating parameters meet the preset recovery conditions; and controlling the variable frequency pump to increase its frequency from the safe operating frequency to the initial operating frequency after obtaining feedback on the continuous operation of the fixed frequency pump.
[0011] As a preferred embodiment of the variable frequency and fixed frequency pump wide load response method described in this invention, the safety interlock protection based on unit safety parameters includes: real-time monitoring of the thermodynamic state parameters on the condenser side of the unit and the operating parameters of the circulating water pump as unit safety parameters; when the unit safety parameters exceed the preset safety limit, terminating the load intervention action of the variable frequency pump and the fixed frequency pump, and forcibly triggering the resumption operation command of the variable frequency pump and the fixed frequency pump.
[0012] Secondly, the present invention provides a variable frequency power frequency pump lifting wide load response system, comprising: The coordination and control module judges the load intervention conditions of the unit operating parameters and generates hierarchical control commands. The circulating water pump control module, based on hierarchical control commands, performs load intervention on both variable frequency pumps and fixed frequency pumps, and synchronously coordinates load control. The safety interlock module performs graded recovery control on the variable frequency pump and the fixed frequency pump based on preset recovery conditions, and provides safety interlock protection according to the unit's safety parameters.
[0013] Thirdly, the present invention provides an electronic device, comprising: Memory and processor; The memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions, which, when executed by the processor, implement the steps of a variable frequency power frequency pump to improve wide load response.
[0014] Fourthly, the present invention provides a computer-readable storage medium storing computer-executable instructions that, when executed by a processor, implement the steps of the method for improving the wide load response of a variable frequency power frequency pump.
[0015] Compared with existing technologies, the beneficial effects of this invention are as follows: By comparing load commands and change rates, this invention performs graded interventions such as frequency reduction of variable frequency pumps and short-term shutdown of fixed frequency pumps, improving the response dead zone of single frequency regulation. While rapidly releasing turbine output to respond to scheduling, it relies on the continuous operation of variable frequency pumps to prevent a sharp deterioration in vacuum caused by cooling water interruption. During the intervention, deviation data is used simultaneously to coordinate the adjustment of the boiler and turbine, transforming local intervention into global heat compensation, making up for the energy deficit caused by load increase, and improving the stability of unit ramp-up output. After the response ends, the sequence of starting fixed frequency pumps first and adjusting variable frequency pumps later is followed, supplemented by safety interlocks based on thermodynamic parameters, avoiding hydraulic shocks caused by pump start-up and shutdown, and timely termination of intervention to maintain safety when indicators exceed limits. Overall, this invention deeply integrates circulating water-side intervention with unit coordination, achieving an effective balance between rapid response under wide load conditions and the operational safety of underlying equipment. Attached Figure Description
[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is a schematic diagram of the overall process of a variable frequency power frequency pump to improve wide load response according to an embodiment of the present invention; Figure 2 This is a schematic diagram illustrating the detailed logic flow of a graded intervention and coordinated control method for improving the wide load response of a variable frequency power frequency pump according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the overall structure of a variable frequency power frequency pump lifting wide load response system according to an embodiment of the present invention. Detailed Implementation
[0018] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. 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 protection scope of the present invention.
[0019] Example 1, referring to Figures 1-2 As an embodiment of the present invention, a method for improving the wide load response of a variable frequency power frequency pump is provided, comprising: S1: Determine the load intervention conditions for the unit's operating parameters and generate hierarchical control commands.
[0020] In this embodiment of the application, step S1, generating a graded control command, includes: acquiring unit load command parameters, actual load parameters, target load change rate, and circulating water pump status parameters; when the load command parameters are greater than the actual load parameters and the target load change rate is greater than a preset change rate threshold, and in conjunction with the triggering conditions, generating a graded control command, such as... Figure 1 As shown.
[0021] It should be noted that, in the embodiments of this application, the unit operating parameters include: load command parameters, actual load parameters, target load change rate, circulating water pump status parameters, load deviation, thermodynamic status parameters, and coordinated control parameters.
[0022] Specifically, the unit load command parameters include the automatic generation control target commands received by the generator set in real time; the actual load parameters include the active power currently output by the generator; and the target load change rate includes the load change rate preset and calculated based on the grid dispatch requirements.
[0023] The status parameters of the circulating water pump include the real-time operating frequency and safe operating frequency of the variable frequency pump, the operation and interruption status of the fixed frequency pump, and the equipment operating parameters of the circulating water pump; among which, the equipment operating parameters include the operating current and voltage of the pump motor and the real-time operating data of the frequency converter.
[0024] Thermodynamic state parameters include the absolute pressure on the condenser side, the exhaust temperature of the turbine low-pressure cylinder, and the inlet and outlet water temperatures of the condenser circulating cooling water.
[0025] The coordinated control parameters include boiler fuel control commands and turbine regulating valve opening commands that are adjusted in real time based on load deviations.
[0026] Furthermore, the operating parameters of the generator set are acquired and monitored in real time. When a load increase command is received, and the target load change rate calculated based on the operating parameters exceeds a preset change rate threshold, it indicates that the generator set is currently facing a wide-load response scheduling requirement. The load increase command includes a load command parameter greater than the actual load parameter. The calculation based on the operating parameters is obtained through a comprehensive load response judgment formula, expressed as:
[0027] in, This represents the trigger coefficient for tiered intervention. Indicates load command parameters, Indicates actual load parameters, Indicates the preset time period. Indicates the safety correction factor; By calculating the difference between the load command parameters and the actual load parameters, the real-time load gap at the current moment is obtained, i.e., the magnitude of the load increase demand; when the calculated... When the value exceeds the preset rate of change threshold and the cut-off condition is detected as met, a wide-load response intervention scheduling is determined; and when When the value falls into different preset value ranges, a hierarchical control command is generated to perform hierarchical intervention control.
[0028] Furthermore, after the load increase command and change rate conditions are met, it is further determined whether the current status of the unit meets the preset cut-off conditions. This determination includes detecting the real-time liquid level data of the condenser to confirm that the condenser water level is within the preset normal operating range; obtaining the unit's thermodynamic state parameters to confirm that the current condenser vacuum is within the preset safety limit; monitoring and confirming that the main auxiliary equipment of the generator unit maintains stable operation and is not in an abnormal fluctuation or local interlock protection state; and obtaining the circulating water pump status parameters to confirm that there are no overcurrent, overvoltage, or overload fault feedback signals from the frequency converter and the fixed frequency pump motor in the circulating water system.
[0029] When a load increase command is received, the target load change rate exceeds a preset threshold, and the cut-off conditions are met, the verification is passed. Based on the load increase demand range calculated between the current actual load parameters and the load command parameters, a graded control command is generated and issued. Among them, meeting the cut-off conditions includes normal condenser water level, current vacuum degree within the safe upper limit range, stable operation of main auxiliary equipment, and no faults in the frequency converter and the fixed frequency pump motor.
[0030] In an optional implementation, the graded control command in step S1 can also achieve fine-tuning control of the load through first-level intervention. Specifically, when the calculated load increase demand is within the first preset value range, it indicates that the current load increase demand is moderate and small, and a first-level intervention command is generated. During the execution of the first-level intervention command, a frequency adjustment command is preferentially sent to the variable frequency pump. Through variable frequency adjustment, the frequency is reduced from the real-time operating frequency of 45Hz to the safe operating frequency of 30Hz. As the frequency of the variable frequency pump is rapidly reduced, the circulating water flow provided to the condenser decreases accordingly, guiding the vacuum degree in the thermodynamic state parameters, i.e., the absolute pressure on the condenser side, to fluctuate in a controlled manner. The condenser vacuum slowly decreases from the initial state to -92kPa.
[0031] In another optional implementation, the graded control command in step S1 can also achieve enhanced load response control through secondary intervention. Specifically, when the calculated graded intervention trigger coefficient falls into the second preset value range and the load increase demand is greater than the second preset threshold, it indicates that there is a significant output gap. If it is determined that the primary intervention command cannot meet the load response demand, that is, the variable frequency pump has dropped to the safe operating frequency of 30Hz and the actual load still does not meet the command demand, a secondary intervention command is generated and issued. During the execution of the secondary intervention command, based on the variable frequency pump dropping to the lowest frequency, a command is issued to control the power frequency pump to interrupt operation for 10 seconds for a short period of time. This causes the vacuum degree in the thermodynamic state parameters to decrease, for example, to -88kPa. After the vacuum decreases, the turbine exhaust resistance increases, the low-pressure cylinder efficiency increases, and the actual load is driven to rise to 515MW in a very short time. When the vacuum decreases due to the reduction in circulating water flow, the actual load of the unit can be rapidly increased to the preset value of 508MW within 5 seconds by utilizing the brief increase in the efficiency of the turbine low-pressure cylinder.
[0032] In a preferred embodiment of the present invention, the fine-tuning control achieved by the first-level intervention can release the transient output of the unit by utilizing the moderate drop in vacuum without stopping the mains pump, thus meeting the current wide-load response requirements. At the same time, since the variable frequency pump always operates at a safe operating frequency, the continuity of cooling water supply is ensured, guaranteeing the thermal stability of the unit during load regulation. The transient output increment generated by the second-level intervention can effectively compensate for the problem of untimely load response caused by boiler combustion lag, ensuring that the output characteristics of the unit in the early stage of wide-load response can accurately match the grid dispatch requirements. Through this hierarchical intervention mechanism, refined and gradient coverage of load gaps of different magnitudes is achieved.
[0033] S2: Based on hierarchical control commands, load intervention is performed on variable frequency pumps and fixed frequency pumps, and load coordination control is carried out synchronously.
[0034] In this embodiment of the application, step S2 involves load intervention on the variable frequency pump and the fixed frequency pump, including: controlling the variable frequency pump to reduce its frequency to a safe operating frequency; and maintaining the variable frequency pump in continuous operation during the frequency reduction period; when the variable frequency pump reduces its frequency to a safe operating frequency, performing a second reading on the load command parameters and the actual load parameters; if the load command parameters are greater than the actual load parameters, controlling the fixed frequency pump to stop operating within a preset time.
[0035] In this embodiment of the application, the load intervention for the variable frequency pump and the fixed frequency pump in step S2 further includes: maintaining the variable frequency pump in operation within a safe operating frequency for a preset time during which the fixed frequency pump is interrupted, and controlling the variable frequency pump to deliver circulating cooling water to the condenser.
[0036] In this embodiment of the application, load coordination control is performed synchronously in step S2, including: calculating the deviation data between the load command parameters and the actual load parameters during the load intervention period of the variable frequency pump and the fixed frequency pump; and performing load coordination control based on the deviation data to adjust the boiler fuel control command and the turbine regulating valve opening command, such as... Figure 1 As shown.
[0037] Specifically, upon receiving the graded control command, physical intervention is initiated on the circulating water side actuator. During the load intervention process, a frequency adjustment command is first issued to control the real-time operating frequency of the variable frequency pump to be rapidly reduced. Throughout the frequency reduction period, the variable frequency pump is kept in continuous operation until it drops to a safe operating frequency.
[0038] Furthermore, when the variable frequency pump reduces its frequency to a safe operating frequency, the load command parameters and actual load parameters are read a second time. If the result of the second reading shows that the load command parameters are still greater than the actual load parameters, it indicates that the transient output increment generated by reducing the frequency of the variable frequency pump alone is insufficient to fill the current load gap. At this time, enhanced intervention is triggered to control the fixed frequency pump to stop operating within a preset time. During the preset time of the fixed frequency pump's interruption, the variable frequency pump is maintained to continue operating within the safe operating frequency, and the variable frequency pump is controlled to continuously deliver circulating cooling water at the basic flow rate to the condenser.
[0039] Furthermore, while performing load intervention on both the variable frequency pump and the fixed frequency pump, the load coordination control program is simultaneously activated. During the dynamic process of load intervention, the deviation data between the load command parameters and the actual load parameters is calculated in real time. Based on the deviation data, the boiler fuel control command and the turbine regulating valve opening command of the unit are corrected and adjusted in real time through the compensation signal generated by the preset control algorithm.
[0040] The real-time correction and adjustment includes the calculation using the load coordination compensation formula, expressed as:
[0041] in, This indicates a comprehensive compensation instruction. This represents the proportional adjustment coefficient. Indicates the integral adjustment operator, This indicates a preset control algorithm; when the thermodynamic state parameters are detected to be within a safe range, For normal gain; when the thermodynamic state parameters approach the preset safety limit, It will automatically decrease, thereby reducing pressure. The amplitude of the regulation limits the intensity of boiler and turbine adjustments at the calculation level to prevent the unit from exceeding safety limits; such as Figure 2As shown, this illustrates the decision-making process of switching from primary to secondary intervention by secondarily reading the load deviation during physical intervention, illustrating the interaction between physical-side vacuum intervention and thermal-side intervention. Synchronous and parallel relationships in coordinated control.
[0042] S3: Based on preset recovery conditions, perform graded recovery control on variable frequency pumps and fixed frequency pumps, and perform safety interlock protection according to the unit's safety parameters.
[0043] In this embodiment of the application, step S3 includes performing graded recovery control, which includes: controlling the restart of the fixed frequency pump when the fixed frequency pump has been interrupted for a preset time and the unit operating parameters meet the preset recovery conditions; and controlling the variable frequency pump to increase its frequency from the safe operating frequency to the initial operating frequency after obtaining feedback on the continuous operation of the fixed frequency pump.
[0044] In this embodiment, step S3 involves implementing safety interlock protection based on unit safety parameters, including: real-time monitoring of the thermodynamic state parameters on the condenser side and the operating parameters of the circulating water pumps as unit safety parameters; terminating the load intervention action of the variable frequency pump and the fixed frequency pump when the unit safety parameters exceed preset safety limits, and forcibly triggering the resumption command of the variable frequency pump and the fixed frequency pump. Figure 1 As shown.
[0045] Specifically, the safety interlock protection ensures that the generator set remains within a controlled safety boundary during physical interventions involving wide load response. This is achieved by real-time monitoring of the unit's thermodynamic state parameters, including the absolute pressure on the condenser side, the exhaust temperature of the turbine's low-pressure cylinder, and the inlet and outlet temperatures of the condenser's circulating cooling water, as well as the operating parameters of the circulating water pumps, including the pump motor's operating current and voltage, and the real-time operating data of the frequency converter. This constructs a multi-dimensional unit safety parameter system. During the dynamic process of load intervention, full-process monitoring logic is executed to track the turbine exhaust temperature in real time, ensuring that its value does not exceed the preset alarm value of 80°C. Furthermore, if any unit safety parameter is detected to exceed the preset safety limit, such as an abnormal increase in the absolute pressure on the condenser side approaching the safety warning value, or a current overload signal appearing in the pump motor, the highest-level protection action is immediately executed. This immediately terminates the ongoing load intervention actions, such as frequency reduction of the variable frequency pump or interruption of the fixed frequency pump, and skips the current logical delay, forcibly triggering the resumption command for both the variable frequency pump and the fixed frequency pump.
[0046] Furthermore, a dual protection barrier is formed based on safety parameter feedback and safety correction coefficient. When the unit's safety parameters trigger the preset safety limit, the maximum cooling capacity of the circulating water is forcibly restored, i.e., the variable frequency pump is increased in frequency and the fixed frequency pump is restarted, thereby achieving a rapid increase in vacuum and a rapid stabilization of exhaust steam temperature.
[0047] In an optional implementation, the graded recovery in step S3 can also be achieved through the auxiliary machine reference flow recovery stage. Specifically, when the main frequency pump is interrupted for a preset time of 10 seconds or when the vacuum degree in the thermodynamic state parameters is monitored, that is, when the absolute pressure on the condenser side drops to the preset recovery threshold of -90kPa, it is determined that the recovery point has been entered, and a command is issued to restart the main frequency pump. The constant speed operation characteristics of the main frequency pump are used to quickly fill the flow base of the circulating cooling water, so that the condenser vacuum degree stops deteriorating and begins to change direction.
[0048] In another optional implementation, the graded recovery in step S3 can also be achieved through the variable frequency incremental smoothing return stage. Specifically, after obtaining and confirming the feedback signal that the power frequency pump has been successfully restarted and is in continuous operation, the variable frequency pump is then controlled to slowly recover from the safe operating frequency to the initial operating frequency of 45Hz. During this process, the condenser vacuum level is steadily restored to the initial -95kPa, guiding the actual load to smoothly transition to the load rise curve determined by the boiler fuel control command, and eliminating the transient deviation caused by the intervention action.
[0049] In a preferred embodiment of the present invention, the gradient logic of auxiliary machine reference flow recovery and variable frequency incremental smooth regression avoids the thermal shock caused by the direct jump of circulating cooling water flow from an extremely low value to the rated value in a short period of time. This allows the condenser vacuum to recover in a controlled and gentle manner, minimizing the thermal stress on the turbine low-pressure cylinder caused by drastic fluctuations in cold-end parameters and ensuring the long-term safe operation of the equipment. Due to the rigorous logic of the graded recovery process, the load reduction generated by vacuum recovery can be precisely aligned with the energy increment generated by boiler fuel compensation on the time axis, ensuring that the actual load can smoothly transition to the rising curve controlled by the boiler. This eliminates the unplanned large-scale load fluctuations that may be caused by a sudden increase in cooling water, ensuring that the unit can still maintain high regulation stability and grid adaptability after the wide-load response task is completed.
[0050] The above is a schematic scheme for a method to improve the wide load response of a variable frequency pump. It should be noted that the technical solution of this system for improving the wide load response of a variable frequency pump belongs to the same concept as the technical solution of the method for improving the wide load response of a variable frequency pump described above. Details not described in detail in this embodiment of the system for improving the wide load response of a variable frequency pump can be found in the description of the technical solution of the method for improving the wide load response of a variable frequency pump described above.
[0051] Example 2, as Figure 3 As shown, this embodiment provides a variable frequency power frequency pump lifting wide load response system, including: The coordination and control module judges the load intervention conditions of the unit operating parameters and generates hierarchical control commands. The circulating water pump control module, based on hierarchical control commands, performs load intervention on both variable frequency pumps and fixed frequency pumps, and synchronously coordinates load control. The safety interlock module performs graded recovery control on the variable frequency pump and the fixed frequency pump based on preset recovery conditions, and provides safety interlock protection according to the unit's safety parameters.
[0052] This embodiment also provides an electronic device applicable to a variable frequency power frequency pump improving wide load response, comprising: a memory and a processor; the memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions to implement the method for improving wide load response of a variable frequency power frequency pump as proposed in the above embodiment.
[0053] This embodiment also provides a storage medium storing a computer program that, when executed by a processor, implements a method for improving the wide load response of a variable frequency power frequency pump as proposed in the above embodiments.
[0054] The storage medium proposed in this embodiment and the method for implementing a variable frequency power frequency pump to improve wide load response proposed in the above embodiments belong to the same inventive concept. Technical details not described in detail in this embodiment can be found in the above embodiments, and this embodiment has the same beneficial effects as the above embodiments.
[0055] Based on the above description of the implementation methods, those skilled in the art can clearly understand that the present invention can be implemented using software and necessary general-purpose hardware, and of course, it can also be implemented using hardware. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ROM), random access memory (RAM), flash memory, hard disk, or optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods of the various embodiments of the present invention.
[0056] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.
Claims
1. A method for improving the wide load response of a variable frequency power frequency pump, characterized in that, include: The unit operating parameters are assessed for load intervention conditions, and tiered control commands are generated. Based on hierarchical control commands, load intervention is performed on both variable frequency pumps and fixed frequency pumps, and load coordination control is carried out synchronously. Based on preset recovery conditions, graded recovery control is performed on the variable frequency pump and the fixed frequency pump, and safety interlock protection is implemented according to the unit's safety parameters.
2. The method for improving wide-load response of a variable frequency power frequency pump as described in claim 1, characterized in that, The generation of hierarchical control commands includes: acquiring unit load command parameters, actual load parameters, target load change rate, and circulating water pump status parameters; when the load command parameters are greater than the actual load parameters and the target load change rate is greater than a preset change rate threshold, and in conjunction with the cut-off conditions, generating hierarchical control commands.
3. The method for improving the wide load response of a variable frequency power frequency pump as described in claim 1, characterized in that, The load intervention for the variable frequency pump and the fixed frequency pump includes: controlling the variable frequency pump to reduce its frequency to a safe operating frequency; and maintaining the variable frequency pump in continuous operation during the frequency reduction period; when the variable frequency pump reduces its frequency to a safe operating frequency, reading the load command parameters and the actual load parameters a second time; if the load command parameters are greater than the actual load parameters, controlling the fixed frequency pump to stop operating within a preset time.
4. The method for improving wide-load response of a variable frequency power frequency pump as described in claim 3, characterized in that, The load intervention for the variable frequency pump and the fixed frequency pump also includes: maintaining the variable frequency pump within a safe operating frequency for a preset time during which the fixed frequency pump is interrupted, and controlling the variable frequency pump to deliver circulating cooling water to the condenser.
5. The method for improving the wide load response of a variable frequency power frequency pump as described in claim 1, characterized in that, The synchronous load coordination control includes: calculating the deviation data between the load command parameters and the actual load parameters during the load intervention period of the variable frequency pump and the fixed frequency pump; and performing load coordination control based on the deviation data to adjust the boiler fuel control command and the turbine regulating valve opening command.
6. The method for improving the wide load response of a variable frequency power frequency pump as described in claim 1, characterized in that, The implementation of graded recovery control includes: restarting the fixed frequency pump when the fixed frequency pump has been interrupted for a preset time and the unit operating parameters meet the preset recovery conditions; and controlling the variable frequency pump to increase its frequency from the safe operating frequency to the initial operating frequency after obtaining feedback on the continuous operation of the fixed frequency pump.
7. The method for improving the wide load response of a variable frequency power frequency pump as described in claim 6, characterized in that, The safety interlock protection based on unit safety parameters includes: real-time monitoring of the thermodynamic state parameters on the condenser side of the unit and the operating parameters of the circulating water pump as unit safety parameters; when the unit safety parameters exceed the preset safety limits, terminating the load intervention action of the variable frequency pump and the fixed frequency pump, and forcibly triggering the resumption operation command of the variable frequency pump and the fixed frequency pump.
8. A variable frequency power frequency pump system for improving wide load response, using the variable frequency power frequency pump method for improving wide load response as described in any one of claims 1-7, characterized in that, include: The coordination and control module judges the load intervention conditions of the unit operating parameters and generates hierarchical control commands. The circulating water pump control module, based on hierarchical control commands, performs load intervention on both variable frequency pumps and fixed frequency pumps, and synchronously coordinates load control. The safety interlock module performs graded recovery control on the variable frequency pump and the fixed frequency pump based on preset recovery conditions, and provides safety interlock protection according to the unit's safety parameters.
9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the variable frequency power frequency pump wide load response method according to any one of claims 1 to 7.
10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the variable frequency power frequency pump wide load response method according to any one of claims 1 to 7.