CN118693845B - AGC operation optimization method and system based on pre-allocation mechanism - Google Patents
AGC operation optimization method and system based on pre-allocation mechanism Download PDFInfo
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Abstract
The invention discloses an AGC operation optimization method and system based on a pre-allocation mechanism, wherein the method comprises the steps of obtaining the current operation state information of a power grid and unit equipment and issuing a new set value; according to the new set value, single machine preassignment value calculation is carried out, first comparison is carried out, a first comparison result is obtained by comparing the numerical relation between the preassignment value and the actual emission value, whether stepped allocation is adopted is judged according to the first comparison result, if stepped allocation is adopted, after the AGC single machine allocation value is obtained through actual emission value calculation, second comparison is carried out, and the set value issued to the PID is obtained according to the second comparison result. According to the invention, a pre-allocation mechanism and a stepwise allocation strategy are introduced in the original AGC operation logic, and a stepwise increment mode is adopted by setting a stepwise adjustment threshold value, so that load fluctuation is effectively reduced, the stability of the power grid is improved, the load allocation mode is effectively improved, and the operation stability and safety of the power grid are improved.
Description
Technical Field
The invention relates to the technical field of power system automation, in particular to an AGC operation optimization method and system based on a pre-allocation mechanism.
Background
AGC is an important tool in modern power systems to ensure grid frequency and power balance. The AGC responds to changes in the demand side by adjusting the generator output in real time.
However, the conventional AGC procedure has a defect when processing load distribution when the units approach to the vibration area, and may cause some units to experience larger load fluctuation, and such fluctuation may cause instability of the grid frequency, and even cause serious problems such as failure of a speed regulator, for example, when power demand in a certain area suddenly increases, the conventional load distribution manner may cause output of some generator units to be greatly adjusted, so that frequent load fluctuation is caused. And when the traditional load distribution mode faces sudden load change, the regulation rate is not stable enough, which may cause the condition that the unit is over-regulated or under-regulated when the output is frequently regulated, so that the frequency and the power balance of the power grid are influenced, and even the normal operation of user equipment is influenced. The conventional load distribution method has the defects of coping with the change of the demand of the power system, and influences the stability and the safe operation of the power grid, so that a new optimized distribution method is needed to solve the problems and ensure the stable operation and the safety of the power system.
Disclosure of Invention
The present invention has been made in view of the above-described problems occurring in the prior art.
Therefore, the invention provides an AGC operation optimization method and system based on a pre-allocation mechanism, which solve the problem that the output of some generator sets is greatly adjusted due to the traditional allocation mode at present. And the frequency of the power grid is influenced by overshoot or undershoot when the output is frequently regulated.
In order to solve the technical problems, the invention provides the following technical scheme:
in a first aspect, the present invention provides an AGC operation optimization method based on a pre-allocation mechanism, including:
Acquiring current running state information of a power grid and unit equipment, and issuing a new set value;
According to the new set value, single machine pre-allocation value calculation is carried out, and first comparison is carried out, wherein the first comparison obtains a first comparison result by comparing the numerical relation between the pre-allocation value and the actual transmission value;
judging whether to adopt step-type distribution according to the first comparison result;
if the step distribution is adopted, the AGC single machine distribution value is obtained through actual value calculation, and then the second comparison is carried out;
and obtaining a set value issued to the PID according to the second comparison result.
The AGC operation optimization method based on the pre-allocation mechanism is a preferable scheme, wherein the first comparison obtains a first comparison result by comparing the relation between the pre-allocation value and the real sending value, and specifically comprises the following steps:
calculating and judging the effectiveness to obtain a single machine pre-allocation value pi agc;
And comparing whether the difference value between the pre-allocation value P [ i ] agc and the unit actual transmission value P [ i ] is larger than a first threshold value.
As a preferable scheme of the AGC operation optimization method based on the pre-allocation mechanism, the first threshold value is obtained through a maximum value preset proportion.
As a preferable scheme of the AGC operation optimization method based on the pre-allocation mechanism, the method comprises the steps of:
if the difference value is greater than the first threshold value, step-type distribution is adopted;
if the difference value is smaller than or equal to the first threshold value, the pre-distribution value pi AGC is directly assigned to the AGC single machine distribution value pi agcset.
As a preferable scheme of the AGC operation optimization method based on the pre-allocation mechanism, the invention comprises the steps of calculating the real sending value to obtain the AGC single machine allocation value, wherein the method comprises the following steps:
AGC single machine distribution value pi agcset is obtained by summing the machine set real sending value pi and the first threshold value;
Issuing the assigned value P [ i ] agcset of AGC single machine to PID set value;
and after waiting for the current actual value P [ i ]' to enter the threshold value P [ i ] threshold, performing second comparison.
As a preferable scheme of the AGC operation optimization method based on the pre-allocation mechanism, the threshold value is obtained through a maximum preset proportion.
As a preferred embodiment of the AGC operation optimization method based on the pre-allocation mechanism, the second comparison includes:
if the difference between the pre-allocation value P [ i ] agc and the current actual transmission value P [ i ]' is larger than a first threshold value, returning to perform step allocation again;
when the step-type distribution is carried out again, the actual transmission value pi of the unit is updated to the current actual transmission value pi';
If the difference value between the pre-allocation value P [ i ] AGC and the current actual transmission value P [ i ]' is smaller than or equal to a first threshold value, the pre-allocation value P [ i ] AGC is directly assigned to the AGC single machine allocation value P [ i ] agcset.
In a second aspect, the present invention provides an AGC operation optimization system based on a pre-allocation mechanism, including:
the acquisition module is used for acquiring the current running state information of the power grid and the unit equipment and issuing a new set value;
The first comparison module is used for calculating a single machine pre-allocation value according to the new set value and performing first comparison, and the first comparison obtains a first comparison result through the relation between the pre-allocation value and the real sending value;
The judging module is used for judging whether to adopt step-type distribution according to the first comparison result;
If the second comparison module adopts the step distribution, the second comparison is carried out after the AGC single machine distribution value is obtained through the actual value calculation;
and the issuing module is used for obtaining a set value issued to the PID according to the second comparison result.
In a third aspect, the present invention provides a computing device comprising:
A memory and a processor;
The memory is configured to store computer-executable instructions that, when executed by the processor, implement the steps of the pre-allocation mechanism based AGC operation optimization method.
In a fourth aspect, the present invention provides a computer readable storage medium storing computer executable instructions which, when executed by a processor, implement the steps of the pre-allocation mechanism based AGC operation optimization method.
Compared with the prior art, the method has the beneficial effects that the pre-allocation mechanism and the step-type allocation strategy are introduced into the original AGC operation logic, and the power grid load change is more flexibly dealt with by setting the step-type adjustment threshold value and comparing twice. The stepwise allocation will gradually adjust the unit output in preset increments rather than making a large adjustment at a time. The gradual adjustment mode can effectively reduce load fluctuation, and the gradual increment mode is adopted when the unit output is adjusted, so that the stability of the power grid is improved, the load distribution mode is effectively improved, the system can more stably cope with the load change of the power grid, and the running stability and the safety of the power grid are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic overall flow diagram of an AGC operation optimization method based on a pre-allocation mechanism according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of an AGC operation optimization method based on a pre-allocation mechanism according to an embodiment of the present invention;
Fig. 3 is a schematic diagram of conventional AGC operation logic in an AGC operation optimization method based on a pre-allocation mechanism according to a second embodiment of the present invention.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
Example 1
Referring to fig. 1-2, for one embodiment of the present invention, there is provided an AGC operation optimization method based on a pre-allocation mechanism, including:
s100, acquiring current running state information of a power grid and unit equipment, and issuing a new set value;
It should be noted that the operation state information includes grid frequency and power, and the like.
S200, calculating a single machine pre-allocation value according to a new set value, and performing first comparison, wherein the first comparison obtains a first comparison result by comparing the numerical relation between the pre-allocation value and the real sending value;
It should be noted that, the comparison of the numerical relationship between the pre-allocation value and the actual emission value may be that the difference between the pre-allocation value pi agc and the actual emission value pi is compared with a preset value, or may be that the ratio of the division between the pre-allocation value pi agc and the actual emission value pi is compared with a preset value.
Preferably, the first comparison obtains a first comparison result through a relation between a pre-assigned value and a real sending value, and specifically includes:
calculating and judging the effectiveness to obtain a single machine pre-allocation value pi agc;
And comparing whether the difference value between the pre-allocation value P [ i ] agc and the unit actual transmission value P [ i ] is larger than a first threshold value.
Further, the first threshold is obtained by a maximum preset ratio.
Specifically, the preset proportion of the maximum value can be 20% or 30% and other proportion values which are arbitrarily in line with the actual condition of the site;
For example, when comparing the difference between the pre-allocation value pi agc and the unit actual value pi as shown in fig. 2, it is preferable that the comparison be performed with a 20% ratio of the maximum value as the first threshold, and this may be expressed as:
|P[i]agc-P[i]|>0.2P[i]max
it should be noted that, the validity judgment may be checked once before and after calculating the pre-assigned value of the single machine, if any time does not meet the validity judgment result, the following steps are not executed in the direct alarm, and the validity judgment may be whether the difference between the set value and the actual value exceeds the maximum value difference limit, whether the set value is in the vibration region, whether the set value exceeds the adjustable region upper limit, etc.
S300, judging whether to adopt step-type distribution according to a first comparison result;
Still further, the method comprises:
if the difference value is greater than the first threshold value, step-type distribution is adopted;
if the difference value is smaller than or equal to the first threshold value, the pre-distribution value pi AGC is directly assigned to the AGC single machine distribution value pi agcset.
S400, as shown in FIG. 2, if the step distribution is adopted, the AGC single machine distribution value is obtained through actual value calculation, and then the second comparison is carried out;
Furthermore, the method for obtaining the AGC single machine distribution value through actual value calculation comprises the following steps:
AGC single machine distribution value pi agcset is obtained by summing the machine set real sending value pi and the first threshold value;
Issuing the assigned value P [ i ] agcset of AGC single machine to PID set value;
and after waiting for the current actual value P [ i ]' to enter the threshold value P [ i ] threshold, performing second comparison.
Specifically, taking the first threshold of 0.2P [ i ] max as an example, the summation can be expressed as:
P[i]agcset=P[i]+0.2P[i]max
Further, the threshold is obtained by a maximum preset ratio.
It should be noted that, the preset ratio of the maximum value can be 5% or 8% or any ratio value which meets the actual condition of the site;
Specifically, the threshold value Pi threshold obtained at the maximum value of 5% can be expressed as:
P_threshold=0.05P[i]max
it should be noted that the purpose of using the threshold value is mainly to determine whether to continue to compare and allocate the pre-allocation value with the current actual value, so as to make adjustment in time and shorten the calculation time.
Still further, the second comparison includes:
if the difference between the pre-allocation value P [ i ] agc and the current actual transmission value P [ i ]' is larger than a first threshold value, returning to perform step allocation again;
when the step-type distribution is carried out again, the actual transmission value pi of the unit is updated to the current actual transmission value pi';
If the difference value between the pre-allocation value P [ i ] AGC and the current actual transmission value P [ i ]' is smaller than or equal to a first threshold value, the pre-allocation value P [ i ] AGC is directly assigned to the AGC single machine allocation value P [ i ] agcset.
S500, obtaining a set value issued to the PID according to the second comparison result.
In summary, the scheme of the invention introduces a pre-distribution value and a stepped distribution strategy to avoid larger load fluctuation when approaching a vibration area, effectively reduce the load fluctuation of a unit when approaching the vibration area, improve the operation safety and stability of a power grid, and moderately sacrifice the adjustment rate on the premise of meeting the safe operation, so as to achieve the balance of the pre-distribution value and the stepped distribution strategy and ensure the stability of the adjustment process.
The foregoing is a schematic scheme 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 and the technical solution of the AGC operation optimization method based on the pre-allocation mechanism belong to the same concept, and details of the technical solution of the AGC operation optimization system based on the pre-allocation mechanism in this embodiment, which are not described in detail, can be referred to the description of the technical solution of the AGC operation optimization method based on the pre-allocation mechanism.
The AGC operation optimization system based on the pre-allocation mechanism in this embodiment includes:
the acquisition module is used for acquiring the current running state information of the power grid and the unit equipment and issuing a new set value;
the first comparison module is used for calculating a single machine pre-allocation value according to the new set value, and performing first comparison, and the first comparison obtains a first comparison result by comparing the numerical relation between the pre-allocation value and the real sending value;
The judging module is used for judging whether to adopt step-type distribution according to the first comparison result;
If the second comparison module adopts the step distribution, the AGC single machine distribution value is obtained through the actual value calculation, and the second comparison is carried out;
and the issuing module is used for obtaining a set value issued to the PID according to the second comparison result.
The embodiment also provides a computing device, which is suitable for the situation of AGC operation optimization based on a pre-allocation mechanism, and comprises:
A memory and a processor; the memory is configured to store computer executable instructions, and the processor is configured to execute the computer executable instructions to implement the AGC operation optimization method based on the pre-allocation mechanism as set forth in the above embodiment.
The present embodiment also provides a storage medium having stored thereon a computer program which, when executed by a processor, implements an AGC operation optimization method based on a pre-allocation mechanism as proposed in the above embodiments.
The storage medium proposed in this embodiment belongs to the same inventive concept as the method for implementing AGC operation optimization based on a pre-allocation mechanism proposed in the above embodiment, and technical details not described in detail in this embodiment can be seen in the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.
From the above description of embodiments, it will be clear to a person skilled in the art that the present invention may be implemented by means of software and necessary general purpose hardware, but of course also by means of hardware, although in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as a floppy disk, a read only Memory (ReadOnly, memory, ROM), a random access Memory (Random Access Memory, RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method of the embodiments of the present invention.
Example 2
Referring to fig. 1, fig. 3 and table 1, based on the previous embodiment, this embodiment provides an application example of an AGC operation optimization method based on a pre-allocation mechanism.
Compared with the conventional method, the conventional method is shown in fig. 3, and the optimization method using the new AGC procedure can show significant differences in various indexes, and is specifically shown in table 1.
Table 1 comparison of the various indices
Through the table 1, compared with the traditional method, the scheme can clearly show obvious advantages in the aspects of reducing the load fluctuation degree, improving the stability of the adjusting speed, enhancing the frequency stability of the power grid, reducing the adjusting frequency of the unit and the like, is beneficial to improving the stability and the safety of the power system, and has important significance to the industry.
It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.
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| US9160171B2 (en) * | 2012-06-05 | 2015-10-13 | Alstom Technology Ltd. | Pre-processing of data for automatic generation control |
| CN111049195B (en) * | 2020-01-03 | 2023-10-27 | 云南电网有限责任公司电力科学研究院 | An AGC parameter optimization method and device |
| CN111654068B (en) * | 2020-07-02 | 2021-07-27 | 华能澜沧江水电股份有限公司 | A method for active power control of hydroelectric generating units in dual-suggested operating areas |
| CN117439094A (en) * | 2023-09-28 | 2024-01-23 | 贵州乌江水电开发有限责任公司 | AGC (automatic gain control) micro-increment power distribution method and system |
| CN117592672B (en) * | 2023-10-10 | 2025-04-04 | 南京河海南自水电自动化有限公司 | A run-of-river power station active power regulation intelligent control method and system |
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| CN103513640A (en) * | 2013-10-11 | 2014-01-15 | 国家电网公司 | Integral optimization method and system for automatic power generation system of coal-fired unit |
| CN108574289A (en) * | 2018-03-13 | 2018-09-25 | 浙江大学 | A stepwise frequency modulation method based on centralized control for microgrid isolated operation |
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