An AGC operation optimization method and system based on a pre-allocation mechanism

Abstract

The present invention discloses an AGC operation optimization method and system based on a pre-allocation mechanism. The method includes: obtaining the current operation status information of the power grid and unit equipment, and issuing a new set value; calculating the pre-allocation value of a single unit according to the new set value, and performing a first comparison, where the first comparison obtains a first comparison result by comparing the numerical relationship between the pre-allocation value and the actual power generation value; judging whether to adopt a stepped allocation according to the first comparison result; if the stepped allocation is adopted, after obtaining the AGC single-unit allocation value by calculating the actual power generation value, a second comparison is performed; and the set value issued to the PID is obtained according to the second comparison result. By introducing a pre-allocation mechanism and a stepped allocation strategy into the original AGC operation logic, and setting the threshold value of stepped adjustment and adopting a step-by-step incremental method, the present invention effectively reduces load fluctuations, improves the stability of the power grid, effectively improves the load allocation method, and improves the operation stability and safety of the power grid.

Description

Technical Field

[0001] The present invention relates to the technical field of power system automation, and particularly to an AGC operation optimization method and system based on a pre-allocation mechanism. Background Art

[0002] In modern power systems, AGC is an important tool to ensure grid frequency and power balance. AGC responds to changes on the demand side by adjusting the output of generators in real time.

[0003] However, traditional AGC programs have defects in handling load distribution when units are close to the vibration zone, which may cause some units to experience large load fluctuations. Such fluctuations may lead to instability of the grid frequency and even serious problems such as governor failures. For example, when the power demand in a certain area suddenly increases, the traditional load distribution method may cause large adjustments in the output of some generating units, resulting in frequent load fluctuations. Also, the adjustment rate of the traditional load distribution method is not stable enough in the face of sudden load changes, which may cause overshoot or undershoot when the units frequently adjust their output, affecting the grid frequency and power balance, and even the normal operation of user equipment. The deficiencies of the traditional load distribution method in coping with power system demand changes affect the stability and safe operation of the grid. Therefore, there is an urgent need for a new optimization distribution method to solve these problems and ensure the stable operation and safety of the power system. Summary of the Invention

[0004] In view of the above existing problems, the present invention is proposed.

[0005] Therefore, the present invention provides an AGC operation optimization method and system based on a pre-allocation mechanism to solve the problems that the current traditional distribution method causes large adjustments in the output of some generating units, leading to instability of the grid frequency and even governor failures; and overshoot or undershoot occurs during frequent output adjustments, affecting the grid frequency and power balance.

[0006] To solve the above technical problems, the present invention provides the following technical solutions:

[0007] In a first aspect, the present invention provides an AGC operation optimization method based on a pre-allocation mechanism, including:

[0008] Obtain the current operation status information of the power grid and unit equipment, and issue a new set value;

[0009] According to the new set value, calculate the pre-allocation value for a single unit and perform a first comparison. The first comparison obtains a first comparison result by comparing the numerical relationship between the pre-allocation value and the actual output value;

[0010] According to the first comparison result, determine whether to adopt stepped distribution;

[0011] If the stepped distribution is adopted, after obtaining the AGC single-unit distribution value through the actual power generation value, a second comparison is performed;

[0012] The set value sent to the PID is obtained according to the second comparison result.

[0013] As a preferred scheme of the AGC operation optimization method based on the pre-distribution mechanism described in the present invention, wherein: the first comparison obtains the first comparison result by comparing the relationship between the pre-distribution value and the actual power generation value, specifically including:

[0014] After calculating and performing validity judgment, the single-unit pre-distribution value P[i]agc is obtained;

[0015] Compare whether the difference between the pre-distribution value P[i]agc and the actual power generation value P[i] of the unit is greater than the first threshold.

[0016] As a preferred scheme of the AGC operation optimization method based on the pre-distribution mechanism described in the present invention, wherein: the first threshold is obtained through a preset ratio of the maximum value.

[0017] As a preferred scheme of the AGC operation optimization method based on the pre-distribution mechanism described in the present invention, wherein: according to the first comparison result, judging whether to adopt the stepped distribution includes:

[0018] If the difference is greater than the first threshold, the stepped distribution is adopted;

[0019] If the difference is less than or equal to the first threshold, directly assign the pre-distribution value P[i]agc to the AGC single-unit distribution value P[i]agcset.

[0020] As a preferred scheme of the AGC operation optimization method based on the pre-distribution mechanism described in the present invention, wherein: calculating the AGC single-unit distribution value through the actual power generation value includes:

[0021] The AGC single-unit distribution value P[i]agcset is obtained by summing the actual power generation value P[i] of the unit and the first threshold;

[0022] Send the AGC single-unit distribution value P[i]agcset to the PID set value;

[0023] Wait until the current actual power generation value P[i]′ enters the threshold value P[i]threshold, and then perform the second comparison.

[0024] As a preferred scheme of the AGC operation optimization method based on the pre-distribution mechanism described in the present invention, wherein: the threshold value is obtained through a preset ratio of the maximum value.

[0025] As a preferred solution of the AGC operation optimization method based on the pre-allocation mechanism according to the present invention, where: the second comparison includes:

[0026] If the difference between the pre-allocation value P[i]agc and the current actual dispatch value P[i]′ is greater than the first threshold, then return for stepped allocation again;

[0027] When performing stepped allocation again, the actual dispatch value P[i] of the unit is updated to the current actual dispatch value P[i]′;

[0028] If the difference between the pre-allocation value P[i]agc and the current actual dispatch value P[i]′ is less than or equal to the first threshold, then directly assign the pre-allocation value P[i]agc to the AGC single-unit allocation value P[i]agcset.

[0029] In a second aspect, the present invention provides an AGC operation optimization system based on a pre-allocation mechanism, including:

[0030] An acquisition module, configured to acquire the current operation status information of the power grid and unit equipment, and issue a new set value;

[0031] A first comparison module, configured to calculate a single-unit pre-allocation value according to the new set value, and perform a first comparison, where the first comparison obtains a first comparison result through the relationship between the pre-allocation value and the actual dispatch value;

[0032] A judgment module, configured to judge whether to adopt stepped allocation according to the first comparison result;

[0033] If stepped allocation is adopted, the second comparison module performs a second comparison after obtaining the AGC single-unit allocation value through actual dispatch value calculation;

[0034] A distribution module, configured to obtain the set value issued to the PID according to the second comparison result.

[0035] In a third aspect, the present invention provides a computing device, including:

[0036] A memory and a processor;

[0037] The memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions, and when the computer-executable instructions are executed by the processor, the steps of the AGC operation optimization method based on the pre-allocation mechanism are implemented.

[0038] In a fourth aspect, the present invention provides a computer-readable storage medium, which stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, the steps of the AGC operation optimization method based on the pre-allocation mechanism are implemented.

[0039] Compared with the prior art, the beneficial effects of the present invention are as follows: By introducing a pre-allocation mechanism and a stepped allocation strategy into the original AGC operation logic, and setting the threshold for stepped adjustment and performing two comparisons, the present invention can respond more flexibly to changes in grid load. The stepped allocation will adjust the unit output step by step according to the preset increment, rather than making a large adjustment at one time. This way of gradual adjustment can effectively reduce load fluctuations. When adjusting the unit output, a gradual increment method is adopted, which effectively improves the stability of the grid, improves the load distribution method, enables the system to respond more smoothly to changes in grid load, and improves the operation stability and safety of the grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0041] Figure 1 It is a schematic diagram of the overall process of the AGC operation optimization method based on the pre-allocation mechanism according to an embodiment of the present invention;

[0042] Figure 2 It is a schematic diagram of the specific process of the AGC operation optimization method based on the pre-allocation mechanism according to an embodiment of the present invention;

[0043] Figure 3 It is a schematic diagram of the traditional AGC operation logic in the AGC operation optimization method based on the pre-allocation mechanism according to the second embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0044] In order to make the above objects, features, and advantages of the present invention more obvious and understandable, the following will make a detailed description of the specific embodiments of the present invention with reference to the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0045] Embodiment 1

[0046] Refer to Figure 1-2 , which is an embodiment of the present invention, and provides an AGC operation optimization method based on a pre-allocation mechanism, including:

[0047] S100: Obtain the current operation status information of the power grid and unit equipment, and issue a new set value;

[0048] It should be noted that the operating status information includes grid frequency, power, etc.

[0049] S200: According to the new set value, calculate the single-unit pre-allocation value and conduct the first comparison. The first comparison obtains the first comparison result by comparing the numerical relationship between the pre-allocation value and the actual power generation value.

[0050] It should be noted that the comparison of the numerical relationship between the pre-allocation value and the actual power generation value can be carried out by comparing the difference between the pre-allocation value P[i]agc and the actual power generation value P[i] of the unit with a preset value, or by comparing the ratio of the pre-allocation value P[i]agc to the actual power generation value P[i] of the unit with a preset value.

[0051] Preferably, the first comparison obtains the first comparison result through the relationship between the pre-allocation value and the actual power generation value, specifically including:

[0052] Calculate and conduct validity judgment to obtain the single-unit pre-allocation value P[i]agc;

[0053] Compare whether the difference between the pre-allocation value P[i]agc and the actual power generation value P[i] of the unit is greater than the first threshold.

[0054] Furthermore, the first threshold is obtained through a preset ratio of the maximum value.

[0055] Specifically, the preset ratio of the maximum value can be any ratio value that conforms to the actual situation on site, such as 20% or 30%;

[0056] It should be noted that, for example: as Figure 2 shown, when comparing the difference between the pre-allocation value P[i]agc and the actual power generation value P[i] of the unit, it is preferred to use 20% of the maximum value as the first threshold for comparison, which can be expressed as:

[0057] |P[i]agc - P[i]| > 0.2P[i]max

[0058] It should also be noted that the validity judgment can be verified once before and after calculating the single-unit pre-allocation value. If any one does not meet the validity judgment result, an alarm will be directly given and the following steps will not be executed. The validity judgment can be whether the difference between the set value and the actual power generation value exceeds the maximum difference limit, whether the set value is within the vibration area, whether the set value exceeds the upper limit of the adjustable range, etc.

[0059] S300: According to the first comparison result, judge whether to adopt stepped allocation;

[0060] Furthermore, it includes:

[0061] If the difference is greater than the first threshold, adopt stepped allocation;

[0062] If the difference is less than or equal to the first threshold, directly assign the pre-allocated value P[i]agc to the AGC single-unit allocation value P[i]agcset.

[0063] S400: As Figure 2 shown, if stepped allocation is adopted, after obtaining the AGC single-unit allocation value through the actual dispatch value, a second comparison is performed;

[0064] Furthermore, obtaining the AGC single-unit allocation value through the actual dispatch value includes:

[0065] The AGC single-unit allocation value P[i]agcset is obtained by summing the actual dispatch value P[i] of the unit and the first threshold;

[0066] Send the AGC single-unit allocation value P[i]agcset to the PID set value;

[0067] Wait until the current actual dispatch value P[i]′ enters the threshold value P[i]threshold, and then perform the second comparison.

[0068] Specifically, taking the first threshold as 0.2P[i]max as an example, the summation can be expressed as:

[0069] P[i]agcset = P[i] + 0.2P[i]max

[0070] Furthermore, the threshold value is obtained through a preset ratio of the maximum value.

[0071] It should be noted that the preset ratio of the maximum value here can be any ratio value that conforms to the actual on-site situation, such as 5% or 8%;

[0072] Specifically, taking 5% of the maximum value to obtain the threshold value P[i]threshold can be expressed as:

[0073] P_threshold = 0.05P[i]max

[0074] It should be noted that the purpose of using the threshold value is mainly to judge whether to continue the comparison and allocation of the pre-allocated value and the current actual dispatch value, so as to make timely adjustments and shorten the calculation time.

[0075] Furthermore, the second comparison includes:

[0076] If the difference between the pre-allocated value P[i]agc and the current actual dispatch value P[i]′ is greater than the first threshold, return to perform stepped allocation again;

[0077] When performing stepped allocation again, the actual dispatch value P[i] of the unit is updated to the current actual dispatch value P[i]′;

[0078] If the difference between the pre-allocated value P[i]agc and the current actually transmitted value P[i]' is less than or equal to the first threshold, directly assign the pre-allocated value P[i]agc to the AGC single-unit allocation value P[i]agcset.

[0079] S500: Obtain the set value to be sent to the PID according to the second comparison result.

[0080] In summary, the solution of the present invention introduces a pre-allocated value and a stepped allocation strategy to avoid large load fluctuations when approaching the vibration area, effectively reducing the load fluctuations of the unit when approaching the vibration area, improving the operation safety and stability of the power grid. At the same time, on the premise of meeting safe operation, the adjustment rate is moderately sacrificed to achieve a balance between the two, ensuring the smoothness of the adjustment process.

[0081] The above is a schematic solution of an AGC operation optimization method based on a pre-allocation mechanism in this embodiment. It should be noted that the technical solution of the AGC operation optimization system based on the pre-allocation mechanism belongs to the same concept as the above-mentioned AGC operation optimization method based on the pre-allocation mechanism. For the details not described in detail in the technical solution of the AGC operation optimization system based on the pre-allocation mechanism in this embodiment, reference can be made to the description of the technical solution of the AGC operation optimization method based on the pre-allocation mechanism.

[0082] The AGC operation optimization system based on the pre-allocation mechanism in this embodiment includes:

[0083] An acquisition module, configured to acquire the current operation status information of the power grid and unit equipment and send a new set value;

[0084] A first comparison module, configured to calculate a single-unit pre-allocated value according to the new set value and perform a first comparison. The first comparison obtains a first comparison result by comparing the numerical relationship between the pre-allocated value and the actually transmitted value;

[0085] A judgment module, configured to judge whether to adopt a stepped allocation according to the first comparison result;

[0086] If the second comparison module adopts a stepped allocation, it calculates the AGC single-unit allocation value through the actually transmitted value and performs a second comparison;

[0087] A sending module, configured to obtain the set value to be sent to the PID according to the second comparison result.

[0088] This embodiment also provides a computing device applicable to the situation of AGC operation optimization based on a pre-allocation mechanism, including:

[0089] 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 AGC operation optimization method based on the pre-allocation mechanism as proposed in the above embodiments.

[0090] This embodiment also provides a storage medium, on which a computer program is stored. When the program is executed by a processor, it implements the AGC operation optimization method based on the pre-allocation mechanism as proposed in the above embodiments.

[0091] The storage medium proposed in this embodiment and the AGC operation optimization method based on the pre-allocation mechanism proposed in the above embodiments belong to the same inventive concept. Technical details not described in detail in this embodiment can be referred to in the above embodiments, and this embodiment has the same beneficial effects as the above embodiments.

[0092] From the above description of the embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software and necessary general-purpose hardware. Of course, it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as a floppy disk, a read-only memory (ROM), a random access memory (RAM), a flash memory (FLASH), a hard disk, or an optical disc of a computer, etc., including several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods of various embodiments of the present invention.

[0093] Embodiment 2

[0094] Refer to Figure 1 、 Figure 3 and Table 1. Based on the previous embodiment, this embodiment provides an application example of the AGC operation optimization method based on the pre-allocation mechanism.

[0095] Compared with the traditional method, for the traditional method, please refer to Figure 3 , the optimization method using the new AGC program can show significant differences in various indicators. For details, please refer to Table 1.

[0096] Table 1 Comparison of Each Index

[0097]

[0098] Through Table 1, it can be clearly seen that this solution can exhibit obvious advantages over traditional methods in terms of reducing the degree of load fluctuation, improving the stability of the regulation rate, enhancing the stability of the power grid frequency, and reducing the unit adjustment frequency. This helps to improve the stability and security of the power system and is of great significance to the industry.

[0099] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not restrictive. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. An AGC operation optimization method based on a pre-allocation mechanism, characterized in that, Including: Obtain the current operating status information of the power grid and unit equipment, and issue a new set value; According to the new set value, calculate the single-unit pre-allocation value and perform a first comparison. The first comparison obtains a first comparison result by comparing the numerical relationship between the pre-allocation value and the actual output value; According to the first comparison result, judge whether to adopt stepped allocation, specifically including: If the difference is greater than the first threshold, adopt stepped allocation; If the difference is less than or equal to the first threshold, directly assign the pre-allocation value P[i]agc to the AGC single-unit allocation value P[i]acgset; If stepped allocation is adopted, after calculating the AGC single-unit allocation value through the actual output value, perform a second comparison; The calculation of the AGC single-unit allocation value through the actual output value includes: The AGC single-unit allocation value P[i]agcset is obtained by summing the actual output value P[i] of the unit and the first threshold; Send the AGC single-unit allocation value P[i]agcset to the PID set value; Wait until the current actual output value P[i]′ enters the threshold value P[i]threshold, and then perform a second comparison; The second comparison includes: If the difference between the pre-allocation value P[i]agc and the current actual output value P[i]′ is greater than the first threshold, return to perform stepped allocation again; When performing stepped allocation again, update the actual output value P[i] of the unit to the current actual output value P[i]′; If the difference between the pre-allocation value P[i]agc and the current actual output value P[i]′ is less than or equal to the first threshold, directly assign the pre-allocation value P[i]agc to the AGC single-unit allocation value P[i]agcset; Obtain the set value sent to the PID according to the second comparison result.

2. The AGC operation optimization method based on the pre-allocation mechanism according to claim 1, wherein The first comparison obtains a first comparison result by comparing the relationship between the pre-allocation value and the actual output value, specifically including: Calculate and perform validity judgment to obtain the single-unit pre-allocation value P[i]agc; Compare whether the difference between the pre-allocation value P[i]agc and the actual output value P[i] of the unit is greater than the first threshold.

3. The AGC operation optimization method based on the pre-allocation mechanism according to claim 1 or 2, characterized in that, The first threshold is obtained through a preset ratio of the maximum value.

4. The AGC operation optimization method based on the pre-allocation mechanism according to claim 3, wherein The threshold value is obtained through a preset ratio of the maximum value.

5. A system applying the AGC operation optimization method based on a pre-allocation mechanism as described in claim 1, characterized in that, Including: An acquisition module for obtaining the current operating status information of the power grid and unit equipment and issuing a new set value; A first comparison module for calculating the single-unit pre-allocation value according to the new set value and performing a first comparison. The first comparison obtains a first comparison result through the relationship between the pre-allocation value and the actual output value; A judgment module for judging whether to adopt stepped allocation according to the first comparison result; A second comparison module, if stepped allocation is adopted, after calculating the AGC single-unit allocation value through the actual output value, perform a second comparison; A sending module for obtaining the set value sent to the PID according to the second comparison result.

6. An electronic device, including: 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. When the computer-executable instructions are executed by the processor, the steps of the AGC operation optimization method based on the pre-allocation mechanism described in any one of claims 1 to 4 are implemented.

7. A computer-readable storage medium stores computer-executable instructions that, when executed by a processor, implement the steps of the AGC operation optimization method based on a pre-allocation mechanism according to any one of claims 1 to 4.

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