Primary frequency regulation adaptive test system for coal-fired units

Abstract

The present application relates to a primary frequency modulation adaptive analysis test system for a coal-fired unit, characterized in that it is built based on a DCS system and includes: an on / off control module, an acquisition module, a logic operation module and a visual monitoring module, wherein the on / off control module is used to collect parameter information of the coal-fired unit; the logic operation module is used to identify the operation mode of the coal-fired unit according to the parameter information, and to perform a primary frequency modulation adaptive analysis test, and automatically generate frequency modulation performance evaluation indicators; the visual monitoring module is used to display the frequency modulation performance evaluation indicators under each operation mode in a visual interface. Through the present application, the problems of low efficiency, high human resource consumption and great interference to the safe operation of the unit in the existing primary frequency modulation test method are solved, the degree of automation of the test is improved, the test time is reduced, and the safe and stable operation of the unit during the test is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of power system frequency regulation control, and in particular to a primary frequency regulation adaptive test system for coal-fired units. Background Art

[0002] Primary frequency regulation refers to the process of dynamically controlling the change of grid frequency by automatically adjusting the increase or decrease of the unit active power through the control system when the grid frequency deviates from the rated value. It is a continuous and stable regulation process of the grid frequency. Its frequency regulation circuit is usually composed of CCS (coordinated control system) and DEH (digital electric hydraulic control system).

[0003] Among them, the primary frequency regulation on the DEH side directly controls the turbine valve to quickly respond to the needs of primary frequency regulation. The primary frequency regulation on the CCS side adjusts the coal and air volume on the boiler side, increases or decreases the boiler output, and is used to make up for the energy storage consumed by the rapid response on the DEH side, thereby maintaining the stability of the unit load and ensuring stable and effective power quality.

[0004] In related technologies, the primary frequency modulation test is mainly performed by local power research institutes, in which the test load point, identification of operating mode and test frequency difference are all completed through manual operation. During the test, since the coal quality, unit operating conditions, operating parameters and operating experience are all dynamically changing, inaccurate prediction or improper operation may cause the boiler to operate at overpressure or underpressure. At the same time, the test process also takes a long time (usually 24 to 48 hours). Due to the existence of the above uncertain factors, the safe and stable operation of the unit during the primary frequency modulation test is affected.

[0005] There is no effective solution to the problem that the existing primary frequency regulation test method has a significant interference with the stable operation of the unit. Summary of the invention

[0006] The embodiment of the present application provides a primary frequency regulation adaptive analysis test system for a coal-fired unit, so as to at least solve the problems in the related art that the primary frequency regulation test method is inefficient and has a significant interference with the stable operation of the unit.

[0007] In the first aspect, the embodiment of the present application provides a primary frequency modulation adaptive analysis test system for a coal-fired unit, which is built based on a DCS system. The system includes: an on-off control module, a collection module, a logic operation module, and a visual monitoring module, wherein:

[0008] The input and output control module is used to control the input or output of the adaptive analysis test system;

[0009] The acquisition module is used to collect parameter information of the coal-fired unit when the adaptive test system has been put into use and the comprehensive valve position is lower than a preset percentage;

[0010] The logic operation module is connected to the acquisition module, and is used to identify the operation mode of the coal-fired unit according to the parameter information, and to perform a frequency modulation adaptive analysis test in the CCS mode, the DEH single valve mode and the DEH sequential valve mode, and automatically generate a frequency modulation performance evaluation index.

[0011] The primary frequency modulation adaptive analysis test includes: dead zone test, load point rise and fall test, and frequency difference adaptive selection test. During the primary frequency modulation adaptive analysis test, the output parameter of the coal-fired unit is calculated according to the main steam pressure and the theoretical deviation, and the frequency difference signal is obtained by automatically adapting to the unit operating conditions according to the output parameter;

[0012] The visual monitoring module is connected to the logic operation module, and is used to display the frequency modulation performance evaluation indicators in the CCS operation mode, the DEH single valve mode and the DEH sequential valve mode in a visual interface.

[0013] In some embodiments, the startup and shutdown control module automatically exits the primary frequency modulation adaptive test system and maintains the current test result when the real-time load of the coal-fired unit exceeds a preset load value, or when the main steam pressure fluctuation exceeds a preset pressure fluctuation value;

[0014] When the reset instruction is received, the primary frequency modulation adaptive test system is put into operation, and the primary frequency modulation adaptive analysis test is restarted.

[0015] In some of the embodiments, the parameter information collected by the acquisition module includes: AGC input signal, coordination input signal, single valve input signal, sequence valve input signal, unit load, main steam pressure, unit speed, sliding pressure curve, primary frequency regulation action parameters, frequency difference load compensation amount and comprehensive valve position.

[0016] In some embodiments, the logic operation module is further used to: before identifying the operation mode of the coal-fired unit, determine whether the AGC system of the coal-fired unit is exited, and if so, identify the operation mode of the coal-fired unit according to the parameter information,

[0017] If not, the process loops and waits for the AGC system to exit, and then identifies the operating mode of the coal-fired unit based on the parameter information.

[0018] In some of the embodiments, the logic operation module includes: a dead zone test module, a load point rise and fall test module, a frequency difference adaptive test module and a frequency modulation performance evaluation index generation module.

[0019] In some embodiments, the load point lifting and lowering test module is used to perform an adaptive lifting and lowering conversion test between various load points after the dead zone test is completed. The adaptive lifting and lowering conversion test includes:

[0020] Select any load point as the initial load point and conduct a frequency modulation test. After the initial load point test is completed, select the next target load point according to the real-time main steam pressure deviation and conduct a frequency modulation test.

[0021] The test processes of various load points are interlocked, and the reference value of the main steam pressure deviation is determined according to the current main steam pressure and the sliding pressure curve.

[0022] In some embodiments, the frequency difference adaptive test module is used to perform an adaptive frequency difference test between various frequency difference points, and the adaptive frequency difference test includes:

[0023] Select any frequency difference point as the initial frequency difference to perform frequency difference test. After the test of the initial frequency difference point is completed, select the next target frequency difference point to perform frequency difference test according to the real-time main steam pressure deviation.

[0024] The test processes of various frequency difference points are interlocked, and the reference value of the main steam pressure deviation is determined according to the current main steam pressure and the sliding pressure curve.

[0025] In some embodiments, the frequency modulation performance evaluation index includes: response time, adjustment time and rise time, wherein:

[0026] The calculation process of the response time includes: obtaining a frequency modulation response time point, and obtaining the response time by calculating the difference between the frequency modulation response time point and a frequency modulation action time point;

[0027] The calculation process of the adjustment time includes: starting timing from a frequency modulation action, ending timing when the load change of the coal-fired unit is 0 and the load deviation is within a preset standard range, and obtaining the current timing time to obtain the adjustment time;

[0028] The calculation process of the rise time includes: starting timing from the time of a frequency modulation action, when the load change of the coal-fired unit reaches 75% of the frequency difference compensation amount, obtaining the current timing time to obtain the first rise time, and when the load change reaches 90% of the frequency difference compensation amount, obtaining the current timing time to obtain the second rise time.

[0029] In some embodiments, the system further comprises a logical interface, wherein the logical interface comprises a DEH interface and a CCS interface, wherein:

[0030] The DEH interface is used to connect the DEH system and the logic operation module, and the CCS interface is used to connect the CCS system and the logic operation module.

[0031] In some of the embodiments, when the on / off button of the adaptive analysis test system indicates that the system has been put into operation, the frequency difference signal is switched to the output value of the logic operation module.

[0032] Compared with the related art, the embodiment of the present application provides a primary frequency modulation adaptive analysis test system for coal-fired units. The system is built based on the DCS system and includes: a startup and shutdown control module, an acquisition module, a logic operation module and a visual monitoring module. Among them, the startup and shutdown control module is used to control the startup or shutdown of the adaptive analysis test system; the acquisition module is used to collect parameter information of the coal-fired unit when the adaptive test system has been put into operation and the comprehensive valve position is lower than the preset percentage; the logic operation module is used to identify the operation mode of the coal-fired unit according to the parameter information, and to perform a primary frequency modulation adaptive analysis test in the CCS mode, the DEH single valve mode and the DEH sequential valve mode, and automatically generate frequency modulation performance evaluation indicators; the visual monitoring module is used to display the frequency modulation performance evaluation indicators in a visual interface. Through this system, the problems of the existing primary frequency modulation test method, low automation, high human resource consumption and great interference to the safe operation of the unit are solved, the automation degree of the primary frequency modulation test is improved, and the test time is reduced. At the same time, the frequency difference test can be carried out under various adaptive working conditions to ensure the safe and stable operation of the unit during the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0034] Figure 1 is a schematic diagram of a primary frequency modulation adaptive analysis test system for a coal-fired unit according to an embodiment of the present application;

[0035] Figure 2 is a frequency difference signal switching logic diagram according to an embodiment of the present application;

[0036] Figure 3 is a schematic diagram of a dead zone test according to an embodiment of the application;

[0037] Figure 4 is a schematic diagram of load point lifting and lowering conversion according to an embodiment of the present application;

[0038] Figure 5 is a schematic diagram of adaptive selection of frequency difference signals according to an embodiment of the present application;

[0039] Figure 6 is a schematic diagram of a frequency modulation analysis test process according to an embodiment of the present application;

[0040] Figure 7 is a schematic diagram of generating a frequency modulation performance evaluation index according to an embodiment of the present application;

[0041] Figure 8 is a schematic diagram of a frequency difference signal input relationship according to an embodiment of the present application;

[0042] Fig. 9 It is a schematic diagram of the DEH frequency modulation interface information transmission logic according to an embodiment of the present application;

[0043] Fig.10 This is a schematic diagram of the CCS frequency modulation interface information transmission logic according to an embodiment of the present application;

[0044] Fig.11 It is a schematic diagram of a visualization interface according to an embodiment of the present application. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments provided in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0046] Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. In addition, it can also be understood that although the efforts made in this development process may be complicated and lengthy, for ordinary technicians in this field related to the content disclosed in this application, some changes in design, manufacturing or production based on the technical content disclosed in this application are just conventional technical means, and should not be understood as insufficient content disclosed in this application.

[0047] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those of ordinary skill in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0048] Unless otherwise defined, the technical terms or scientific terms involved in this application should be understood by people with ordinary skills in the technical field to which this application belongs. The words "one", "a", "a", "the" and the like involved in this application do not indicate a quantity limitation, and may indicate the singular or plural. The terms "include", "comprise", "have" and any of their variations involved in this application are intended to cover non-exclusive inclusions; for example, a process, method, system, product or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units that are not listed, or may also include other steps or units inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "multiple" involved in this application refers to two or more. "And / or" describes the association relationship of associated objects, indicating that there may be three relationships, for example, "A and / or B" can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects before and after are in an "or" relationship. The terms "first", "second", "third", etc. involved in this application are only used to distinguish similar objects and do not represent a specific ordering of the objects.

[0049] In this document, it should be understood that the terms involved may be technical means for implementing a part of the present invention or other summary technical terms. For example, the terms may include:

[0050] Primary frequency regulation: refers to the automatic control process in which the control system of the units in the power grid automatically controls the increase or decrease of the active power of the units once the frequency of the power grid deviates from the rated value, limits the change of the power grid frequency, and maintains a stable power grid frequency.

[0051] Primary frequency regulation assessment: An evaluation and compensation mechanism is formulated for the response capability of the primary frequency regulation of a power plant, which can be judged by the following indicators: 15 s output response index, 30 s output response index and power contribution index.

[0052] Primary frequency modulation test (test): Through a frequency modulation test on the coal-fired unit, the various technical indicators of the unit are verified.

[0053] The present application provides a primary frequency modulation adaptive analysis test system for a coal-fired unit. Figure 1 is a schematic diagram of a primary frequency modulation adaptive analysis test system for a coal-fired unit according to an embodiment of the present application, such as Figure 1 As shown, the system includes: an investment and withdrawal control module 10, a collection module 11, a logic operation module 12 and a visual monitoring module 13, wherein:

[0054] The input and output control module 10 is used to control the input or output of the adaptive analysis test system;

[0055] The collection module 11 is used to collect parameter information of the coal-fired unit when the adaptive test system has been put into use and the comprehensive valve position is lower than a preset percentage;

[0056] The above preset percentage can be 90%. When the comprehensive valve position is less than 90%, the coal-fired unit is put into the "primary frequency modulation adaptive analysis test system". The system is used to collect data, identify the operating mode and perform adaptive online analysis tests.

[0057] It should be noted that the "primary frequency modulation adaptive analysis test system" is built based on a distributed control system (DCS). The DCS system is a new generation of instrument control system based on microprocessors, adopting the design principles of decentralized control functions, centralized display operations, and taking into account both division and autonomy and comprehensive coordination. It can also be called a "distributed computer control system."

[0058] Furthermore, when the "primary frequency modulation adaptive analysis test system" input / exit button sends an input signal (AUTOTPIN=1), the frequency difference signal of the coal-fired unit is switched to the output result of the logic operation module in the adaptive analysis test system. The specific switching logic is as follows: Figure 2 As shown, Figure 2 It is a logic diagram of frequency difference signal switching according to an embodiment of the present application.

[0059] In this embodiment, the above-mentioned collected parameter information includes: AGC input signal (ACGin), coordination input signal (CCSin), single valve input signal, sequence valve input signal, unit load (Pe), main steam pressure (p), unit speed (Speed), sliding pressure curve F (mv), primary frequency regulation action parameter (PFCACT), frequency difference load compensation amount and comprehensive valve position (μ), etc.

[0060] The logic operation module 12 is connected with the acquisition module 11, the switching control module 10, and the visual monitoring module 13, and is used to identify the operation mode of the coal-fired unit according to the parameter information, and to perform a frequency modulation adaptive analysis test in the CCS mode, the DEH single valve mode, and the DEH sequential valve mode, and automatically generate a frequency modulation performance evaluation index, wherein the frequency modulation adaptive analysis test includes: a dead zone test, a load point rise and fall test, and a frequency difference adaptive selection test. In the process of the frequency modulation adaptive analysis test, the output parameter of the coal-fired unit is calculated according to the main steam pressure and the theoretical deviation, and the frequency difference signal is obtained by automatically adapting to the unit operation condition according to the output parameter;

[0061] Specifically, the "primary frequency modulation adaptive analysis test system" identifies the operation mode of the coal-fired unit according to the above-collected parameter information. If it is in the CCS (unit coordinated control) mode, the following processes are executed in sequence:

[0062] (1) Dead zone test: The first step is to start a frequency modulation dead zone test process. The specific process of the dead zone test T1 is as follows: Figure 3 As shown, Figure 3 is a schematic diagram of a dead zone test according to an embodiment of the application.

[0063] (2) Load point lifting and lowering test: After the dead zone test is completed, the variable working condition adaptive lifting and lowering process of the load point is tested to achieve the lifting and lowering conversion between each load point under the working condition points of 60%, 75% and 90% respectively; the lifting and lowering conversion specific process T2 of each load point is as follows: Figure 4 As shown, Figure 4 is a schematic diagram of load point lifting and lowering conversion according to an embodiment of the present application;

[0064] Among them, in the T2 process, the "primary frequency regulation adaptive analysis test system" automatically senses the main steam pressure deviation and selects the load point lifting and lowering order according to the deviation value. The reference value of the main steam pressure deviation can be determined by formula 1: k=PF(mw), where k represents the main steam pressure deviation, P represents the main steam pressure, and F (mv) represents the reference value determined by the sliding pressure curve.

[0065] Furthermore, after the test execution of any load point is completed, the test is jumped to the next load point according to the real-time k value for the corresponding test. Among them, the load point elevator tests are interlocked to avoid repeated execution of the same process. In this embodiment, the detailed correspondence between k and the load point is shown in Table 1 below.

[0066]

[0067] Table 1

[0068] (3) Frequency difference adaptive selection test: Under different working conditions, start the frequency difference adaptive test process and conduct frequency difference tests at different speeds such as ±4r / min, ±6r / min and ±10r / min. During the test, according to the k value obtained by the above formula 1, combined with the actual working conditions, the frequency difference is automatically adjusted to ensure the safe and stable operation of the unit. The specific selection process T3 of each frequency difference point is as follows: Figure 5 As shown, Figure 5 Schematic diagram of adaptive selection of frequency difference signal according to an embodiment of the present application. In this embodiment, in this embodiment, the detailed corresponding relationship between k and the frequency difference is shown in the following Table 2:

[0069]

[0070] Table 2

[0071] First, select a suitable initial frequency difference for the corresponding test, then select a new frequency difference according to the k value and working conditions, and retest until the process is completed. Among them, each frequency difference test process is interlocked to avoid repeated execution of the same process;

[0072] Further, after the test is completed in the CCS mode, after a preset time delay, the CCS mode of the coal-fired unit is cut off, that is, the coal-fired unit is switched to a non-CCS operation mode. Further, in this operation mode, a single valve test and a sequential valve test are required;

[0073] It should be noted that the specific process execution sequence of the frequency modulation test in the single valve and sequential valve modes of DEH is the same as the above-mentioned CCS process, so it will not be repeated in this embodiment.

[0074] The visual monitoring module 13 is connected to the logic operation module, and is used to display the frequency modulation performance evaluation indicators in the CCS operation mode, the DEH single valve mode and the DEH sequential valve mode in the visual interface.

[0075] During each frequency difference test, a frequency modulation index evaluation process is started, and real-time analysis and evaluation are performed to generate evaluation results under various operating modes, and the evaluation results are displayed in a visual interface; the evaluation indicators include: response time t, adjustment time , Rise time Etc. Specifically, the dynamic evaluation process T4 is as follows Figure 6 As shown, Figure 6 It is a schematic diagram of dynamic indicator evaluation according to an embodiment of the present application.

[0076] In addition, the system also includes a logic interface, which includes a DEH interface and a CCS interface, wherein the DEH interface is used to connect the DEH system and the logic operation module, and the CCS interface is used to connect the CCS system and the logic operation module.

[0077] Compared with the method of manually conducting a frequency modulation test, this system uses a frequency modulation adaptive analysis test system based on a distributed control system to perform automated frequency difference testing. There is no need to manually control the load increase and decrease and manually evaluate indicators, which avoids errors and unit safety risks caused by subjective factors. Furthermore, the adaptive selection of test frequency differences and control of load point increase and decrease, as well as real-time online calculation of various technical indicators of primary frequency modulation, improves overall efficiency, shortens the analysis time of a frequency modulation test, and saves a lot of human resource costs. At the same time, since the selection of frequency difference points and the increase and decrease of load points are adaptively determined according to the current actual working conditions through optimized rules, compared with the existing method that relies on subjective selection by personnel, it can better ensure the safe and stable operation of the unit and lay the foundation for realizing the one-button start and stop function (APS) of coal-fired units.

[0078] In some of the embodiments, in order to ensure the safe and stable operation of the coal-fired unit, the investment and withdrawal control module automatically exits the primary frequency modulation adaptive analysis test system when the unit load is too large (i.e., exceeds the preset value) or the main steam pressure fluctuation is too large (i.e., exceeds the preset value of the pressure fluctuation), and at the same time, maintains the current test results. In this case, the test frequency difference can also be manually selected in the visual interface. Until the reset command is received, the control is re-entered into the "primary frequency modulation adaptive analysis test system" to continue the primary frequency modulation adaptive analysis test.

[0079] In some of the embodiments, in order to avoid interference of the AGC system (Automatic Generation Control) with a frequency modulation experiment, in this embodiment, the logic operation module is also used to: before identifying the operating mode of the coal-fired unit, determine whether the AGC system of the coal-fired unit has exited; if so, identify the operating mode of the coal-fired unit according to the parameter information; if not, wait cyclically until the AGC system exits, and then identify the operating mode of the coal-fired unit according to the parameter information.

[0080] In some of the embodiments, the logic operation module includes: a dead zone test module, a load point rise and fall test module, a frequency difference adaptive test module and a frequency modulation performance evaluation index generation module.

[0081] Specific:

[0082] The load point lifting and lowering test module is used to perform adaptive lifting and lowering conversion tests between various load points after the dead zone test is completed. The adaptive lifting and lowering conversion test includes:

[0083] Select any load point as the initial load point and conduct a frequency modulation test. After the initial load point test is completed, select the next target load point according to the real-time main steam pressure deviation and conduct a frequency modulation test. The test processes of each load point are interlocked, and the reference value of the main steam pressure deviation is determined according to the current main steam pressure and the sliding pressure curve.

[0084] The frequency difference adaptive test module is used to perform adaptive frequency difference tests between various frequency difference points. The adaptive frequency difference test includes:

[0085] Select any frequency difference point as the initial frequency difference for frequency difference test. After the initial frequency difference point test is completed, select the next target frequency difference point for frequency difference test according to the real-time main steam pressure deviation. The test processes of each frequency difference point are interlocked, and the reference value of the main steam pressure deviation is determined according to the current main steam pressure and the sliding pressure curve.

[0086] In some embodiments, the frequency modulation performance evaluation index obtained from a frequency modulation analysis test includes: response time, adjustment time and rise time, wherein:

[0087] The calculation process of the response time includes: obtaining a frequency modulation response time point, and obtaining the response time by calculating the difference between the frequency modulation response time point and the frequency modulation action time point. That is equivalent to: when a frequency modulation action occurs and the load change direction is consistent with the increase or decrease of the frequency difference compensation amount, this is the frequency modulation response time point, and the difference between this time point and the frequency modulation action time point is the response time t. Furthermore, the response time t is displayed visually. If the response time t≥3 seconds, a response time limit alarm talm is issued. Among them, the frequency difference test response time of each operating point is shown in Table 3 below:

[0088]

[0089] Table 3

[0090] The calculation process of the adjustment time includes: starting the timing from the time of a frequency modulation action, ending the timing when the load change of the coal-fired unit is 0 and the load deviation is within the preset standard range, and obtaining the current timing time to obtain the adjustment time. This is equivalent to: starting the timing when a frequency modulation action is performed, until the unit load change is close to 0 and the load deviation is within the standard range, the time at this time is the adjustment time t s Furthermore, the conditional time t is displayed through a visual interface. s， If the adjustment time t≥60 seconds, an adjustment time limit alarm t s alm.

[0091] Among them, the frequency difference test condition time t of each working point s As shown in Table 4 below:

[0092]

[0093] Table 4

[0094] The calculation process of the rise time includes: starting from the time of a frequency modulation action, when the load change of the coal-fired unit reaches 75% of the frequency difference compensation amount, obtaining the current timing time to obtain the first rise time t r75 When the load change reaches 90% of the frequency difference compensation, obtain the current timing time and get the second rise time t r90 The first rise time and the second rise time are displayed through a visual interface. r75 ≥15s or t r90 ≥30s, an alarm will be issued for the rising time exceeding the limit. r75alm ,t r90alm .

[0095] Among them, the frequency difference test condition time t of each working point r75alm ,t r90alm As shown in Table 5 below:

[0096]

[0097] Table 5

[0098] In some of these embodiments, Figure 6 It is a schematic diagram of a frequency modulation analysis test process performed by the system according to an embodiment of the present application.

[0099] like Figure 6 As shown in the figure, the primary frequency regulation analysis test process includes: online identification of unit operating conditions, adaptive rise and fall of test load points, adaptive adjustment of test frequency difference and real-time evaluation of indicators. The whole process of frequency regulation test mainly includes the completion of the primary frequency regulation performance adaptive test analysis and technical indicator evaluation of ±2r / min, ±4r / min, ±6r / min and ±10r / min frequency differences under 60%, 75% and 90% of three operating conditions in three modes of CCS, single valve and sequence valve.

[0100] like Figure 6 As shown, T1 is the ±2r / min dead zone test, and the specific process is as follows Figure 3 T2 is the adaptive lifting process of the safe and stable operation condition of a frequency modulation test. The specific process is as follows Figure 4 As shown, the frequency difference adaptive selection process T3 is embedded in the T2 process. The specific process of T3 is as follows Figure 5 As shown in the figure, the T3 process includes the T4 primary frequency modulation technical indicator evaluation process. The specific process of T4 is as follows Figure 7 As shown, Figure 7 It is a schematic diagram of generating a frequency modulation performance evaluation index according to an embodiment of the present application.

[0101] In some of these embodiments, Figure 8 FIG. 1 is a schematic diagram of a frequency difference signal input relationship according to an embodiment of the present application. Figure 8 As shown in the figure, the primary frequency modulation adaptive analysis test system can switch to select the test frequency difference manually or automatically. When in the automatic state, the test frequency difference output comes from the computer processing unit, and when in the manual state, the frequency difference signal comes from the manual setting of the visual monitoring screen.

[0102] In some of these embodiments, Fig. 9 is a schematic diagram of the DEH frequency modulation interface information transmission logic according to an embodiment of the present application, Fig.10 is a schematic diagram of the CCS frequency modulation interface information transmission logic according to an embodiment of the present application, Fig.11 It is a schematic diagram of a visualization interface according to an embodiment of the present application.

[0103] Those of ordinary skill in the art can understand that all or part of the processes in the above embodiments can be implemented by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0104] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A primary frequency modulation adaptive analysis test system for coal-fired units, It is characterized in that Based on the DCS system, the system includes: a startup and shutdown control module, a collection module, a logic operation module and a visual monitoring module, wherein: The said input and output control module is used to control the input or output of the primary frequency modulation adaptive analysis test system; The acquisition module is used to collect parameter information of the coal-fired unit when the primary frequency modulation adaptive analysis test system has been put into use and the comprehensive valve position is lower than a preset percentage; The logic operation module is connected to the acquisition module, and is used to identify the operation mode of the coal-fired unit according to the parameter information, and to perform a frequency modulation adaptive analysis test in the CCS mode, the DEH single valve mode and the DEH sequential valve mode, and automatically generate a frequency modulation performance evaluation index. The primary frequency modulation adaptive analysis test includes: dead zone test, load point rise and fall test, and frequency difference adaptive selection test. During the primary frequency modulation adaptive analysis test, the output parameter of the coal-fired unit is calculated according to the main steam pressure and the theoretical deviation, and the frequency difference signal is obtained by automatically adapting to the unit operating conditions according to the output parameter; The visual monitoring module is connected to the logic operation module, and is used to display the frequency modulation performance evaluation indicators in the CCS mode, the DEH single valve mode and the DEH sequential valve mode in a visual interface.

2. The system according to claim 1, Features: The startup and shutdown control module automatically exits the primary frequency modulation adaptive analysis test system and maintains the current test result when the real-time load of the coal-fired unit exceeds the preset load value, or the main steam pressure fluctuation exceeds the preset pressure fluctuation value; When the reset instruction is received, the primary frequency modulation adaptive analysis test system is put into operation, and the primary frequency modulation adaptive analysis test is restarted.

3. The system according to claim 1, Features: The parameter information collected by the acquisition module includes: AGC input signal, coordination input signal, single valve input signal, sequence valve input signal, unit load, main steam pressure, unit speed, sliding pressure curve, primary frequency regulation action parameters, frequency difference load compensation amount and comprehensive valve position.

4. The system according to claim 1, Features: The logic operation module is also used to: before identifying the operation mode of the coal-fired unit, determine whether the AGC system of the coal-fired unit is exited, and if so, identify the operation mode of the coal-fired unit according to the parameter information, If not, the process loops and waits for the AGC system to exit, and then identifies the operating mode of the coal-fired unit based on the parameter information.

5. The system according to claim 1, It is characterized in that The logic operation module includes: a dead zone test module, a load point lifting and lowering test module, a frequency difference adaptive test module and a frequency modulation performance evaluation index generation module.

6. The system according to claim 5, Features: The load point lifting and lowering test module is used to perform an adaptive lifting and lowering conversion test between various load points after the dead zone test is completed. The adaptive lifting and lowering conversion test includes: Select any load point as the initial load point and conduct a frequency modulation test. After the initial load point test is completed, select the next target load point according to the real-time main steam pressure deviation and conduct a frequency modulation test. The test processes of various load points are interlocked, and the reference value of the main steam pressure deviation is determined according to the current main steam pressure and the sliding pressure curve.

7. The system according to claim 5, Features: The frequency difference adaptive test module is used to perform an adaptive frequency difference test between various frequency difference points. The adaptive frequency difference test includes: Select any frequency difference point as the initial frequency difference to perform frequency difference test. After the frequency difference test of the initial frequency difference is completed, select the next target frequency difference point to perform frequency difference test according to the real-time main steam pressure deviation. The test processes of various frequency difference points are interlocked, and the reference value of the main steam pressure deviation is determined according to the current main steam pressure and the sliding pressure curve.

8. The system according to claim 1, It is characterized in that The frequency modulation performance evaluation index includes: response time, adjustment time and rise time, among which: The calculation process of the response time includes: obtaining a frequency modulation response time point, and obtaining the response time by calculating the difference between the frequency modulation response time point and a frequency modulation action time point; The calculation process of the adjustment time includes: starting timing from a frequency modulation action, ending timing when the load change of the coal-fired unit is 0 and the load deviation is within a preset standard range, and obtaining the current timing time to obtain the adjustment time; The calculation process of the rise time includes: starting timing from the time of a frequency modulation action, when the load change of the coal-fired unit reaches 75% of the frequency difference compensation amount, obtaining the current timing time to obtain the first rise time, and when the load change reaches 90% of the frequency difference compensation amount, obtaining the current timing time to obtain the second rise time.

9. The system according to claim 1, It is characterized in that The system also includes a logical interface, which includes a DEH interface and a CCS interface, wherein: The DEH interface is used to connect the DEH system and the logic operation module, and the CCS interface is used to connect the CCS system and the logic operation module.

10. The system according to claim 1, It is characterized in that When the on / off button of the primary frequency modulation adaptive analysis test system indicates that the system has been put into operation, the frequency difference signal is switched to the output value of the logic operation module.

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