A coal-fired unit 20% load control method

Abstract

The application discloses a 20% load control method of a coal-fired unit, and applies to the technical field of deep peak regulation. The method comprises the following steps: obtaining a difference between a real-time load and a target load of a total coal-fired unit; determining an adjustment instruction of the total coal-fired unit load; obtaining operation data of the coal-fired unit and determining the coal-fired units capable of adjusting the load; determining a load adjustment sequence of the adjustable coal-fired units; determining load adjustment capabilities of all the adjustable coal-fired units, distributing a load adjustment target according to the load adjustment sequence; determining a response scheme and adjusting the load according to the response scheme, so as to adjust the load of the total coal-fired unit to the target load. The load of the coal-fired unit is adjusted, the coal-fired power generation unit can quickly respond to the change of external load, the cost of load adjustment is considered, the change of external load demand is met, and various energy resources can be more reasonably and efficiently utilized.

Description

Technical Field

[0001] This invention relates to the field of deep peak shaving technology, and more specifically to a method for controlling 20% ​​load of a coal-fired power unit. Background Technology

[0002] With the widespread application of various clean energy sources, the issues of power supply and demand balance and system peak-shaving capacity are becoming increasingly prominent. Due to the unstable nature of clean energy and the fluctuating load demand of the power grid, the load regulation capability of coal-fired power units has become crucial. Load control of coal-fired power units not only relates to the safe and stable operation of the power system but also directly affects the effective utilization and economic benefits of various energy resources in the electricity market. Existing peak-shaving schemes overemphasize the maximum adjustable capacity of coal-fired power units, especially at loads as low as 20%. Achieving the target load leads to excessively high regulation costs and even affects the safe operation of coal-fired power units. Therefore, providing a method for controlling the 20% load of coal-fired power units is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0003] In view of this, the present invention provides a method for controlling 20% ​​load of coal-fired power units, which takes into account the operating conditions of coal-fired power units and the adjustment costs when determining the adjustment scheme, thereby solving the problems existing in the prior art.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A method for controlling the 20% load of a coal-fired power unit includes the following steps:

[0006] S1. Obtain the real-time load and target load of the current total coal-fired units, and determine the difference between the real-time load and the target load;

[0007] S2. Determine the adjustment command for the total coal-fired unit load based on the difference between the real-time load and the target load;

[0008] S3. Obtain the operating data of the coal-fired units and identify the coal-fired units that can be load-regulated;

[0009] S4. Determine the load regulation sequence of the adjustable coal-fired power unit based on the operating data of the adjustable coal-fired power unit and the cost data of load regulation.

[0010] S5. Determine the load regulation capacity of all adjustable coal-fired units and allocate load regulation targets according to the load regulation sequence of the adjustable coal-fired units;

[0011] S6. Determine the response plan based on the load adjustment target of the adjustable coal-fired units and adjust the load according to the response plan so that the load of the total coal-fired units is adjusted to the target load.

[0012] Optionally, in S2, if the real-time load of the total coal-fired power units is greater than the target load, the adjustment command is to reduce the load; if the real-time load of the total coal-fired power units is less than the target load, the adjustment command is to increase the load.

[0013] Optionally, S3 specifically refers to:

[0014] S31. Obtain operational safety indicators for coal-fired power units;

[0015] S32. Determine the weight of each operational safety indicator based on its impact on the safety situation;

[0016] S33. Calculate the safety evaluation score of the coal-fired unit based on the operational safety indicators and their corresponding weights;

[0017] S34. If the safety evaluation score of a coal-fired unit is greater than the preset threshold, it shall be identified as a coal-fired unit that can be load-regulated.

[0018] Optionally, S4 specifically refers to:

[0019] S41. Calculate the load regulation costs and pollution emission data for all adjustable coal-fired power units;

[0020] S42. Obtain real-time load data of adjustable coal-fired units and historical load data of coal-fired units. Based on the historical load data, determine the average stable load of the current adjustable coal-fired units during the historical peak shaving process, and calculate the difference between the real-time load and the average stable load of all adjustable coal-fired units.

[0021] S43. Standardize the load adjustment cost, pollution emission data, and the difference between real-time load and the average stable load, and assign corresponding weights to the load adjustment cost, pollution emission data, and the difference between real-time load and the average stable load.

[0022] S44. Based on load adjustment costs, pollution emission data, the difference between real-time load and the average stable load, and the corresponding weights, calculate the adjustment priority of all adjustable coal-fired units. Sort all adjustable coal-fired units in descending order of adjustment priority to obtain the load adjustment sequence of adjustable coal-fired units.

[0023] Optionally, the load regulation cost of all adjustable coal-fired units is calculated as follows:

[0024] C = C1 + C2 + C3

[0025] In the formula, C is the load adjustment cost, C1 is the adjustment scheme implementation cost, C2 is the fuel increase cost, and C3 is the equipment wear and tear cost.

[0026] Optionally, the pollution emission data for all adjustable coal-fired units are calculated as follows:

[0027] f = s i (P i )+n i (P i )

[0028]

[0029] In the formula, f represents the pollutant emission amount, and s i (P i ) represents the SO2 emissions of coal-fired unit i, and n represents the SO2 emissions of coal-fired unit i. i (P i ) represents the NO of coal-fired unit i x Emissions, sα i sβ i α and γ are both SO2 emission characteristic coefficients of coal-fired unit i, and nα is the emission characteristic coefficient of unit i. i nβ i n and γ are both NO from coal-fired unit i. x Emission characteristic coefficient.

[0030] Optionally, S5 specifically involves: determining the stable load extreme value of the current adjustable coal-fired unit during the historical peak shaving process based on historical load data; using the difference between the real-time load and the stable load extreme value corresponding to the adjustment command as the load regulation capacity of the adjustable coal-fired unit; and allocating load regulation targets to the adjustable coal-fired unit in the order of the load regulation sequence until the real-time load of the total coal-fired unit reaches the target load.

[0031] As can be seen from the above technical solution, compared with the prior art, the present invention provides a 20% load control method for coal-fired power units, which has the following beneficial effects: The present invention can achieve rapid response of coal-fired power units to changes in external load by adjusting the load of the coal-fired power units, while taking into account the cost of load adjustment, meeting the changes in external load demand, and enabling more rational and efficient utilization of various energy resources; The present invention considers the safety performance of coal-fired power units when selecting adjustment methods, and considers the adjustment cost, pollutant emissions, and stable operation when determining the adjustment scheme. It reduces adjustment costs and pollutant emissions while achieving the goal of deep peak shaving, and at the same time ensures the stable operation of coal-fired power units as much as possible. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0033] Figure 1 This is a flowchart of the 20% load control method for coal-fired power units according to the present invention. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] This invention discloses a method for controlling 20% ​​load in a coal-fired power unit, such as... Figure 1 As shown, it includes the following steps:

[0036] S1. Obtain the real-time load and target load of the current total coal-fired units, and determine the difference between the real-time load and the target load;

[0037] S2. Determine the adjustment command for the total coal-fired unit load based on the difference between the real-time load and the target load;

[0038] S3. Obtain the operating data of the coal-fired units and identify the coal-fired units that can be load-regulated;

[0039] S4. Determine the load regulation sequence of the adjustable coal-fired power unit based on the operating data of the adjustable coal-fired power unit and the cost data of load regulation.

[0040] S5. Determine the load regulation capacity of all adjustable coal-fired units and allocate load regulation targets according to the load regulation sequence of the adjustable coal-fired units;

[0041] S6. Determine the response plan based on the load adjustment target of the adjustable coal-fired units and adjust the load according to the response plan so that the load of the total coal-fired units is adjusted to the target load.

[0042] Furthermore, in S2, if the real-time load of the total coal-fired power unit is greater than the target load, the adjustment command is to reduce the load; if the real-time load of the coal-fired power unit is less than the target load, the adjustment command is to increase the load.

[0043] Furthermore, S3 specifically refers to:

[0044] S31. Obtain operational safety indicators for coal-fired power units;

[0045] S32. Determine the weight of each operational safety indicator based on its impact on the safety situation;

[0046] S33. Calculate the safety evaluation score of the coal-fired unit based on the operational safety indicators and their corresponding weights;

[0047] S34. If the safety evaluation score of a coal-fired unit is greater than the preset threshold, it shall be identified as a coal-fired unit that can be load-regulated.

[0048] In this embodiment of the invention, deep peak shaving may cause wear and tear on coal-fired power units, thus creating safety hazards. For example, the start-up and shutdown process of peak shaving involves significant changes in boiler air temperature and heating surface wall temperature, which can easily lead to metal stress fatigue, resulting in water-cooled wall cracking and heating surface leakage. Frequent start-ups and shutdowns of the unit and large load fluctuations can easily cause oxide scale to fall off and block boiler tubes, leading to overheating and tube rupture accidents. Frequent start-ups and shutdowns of auxiliary equipment can affect the reliability and stability of the equipment, increasing the failure rate. Therefore, it is necessary to assess the operational safety indicators of coal-fired power units to confirm their load regulation capabilities and ensure safety.

[0049] In this embodiment of the invention, S32 specifically includes:

[0050] The impact of each operational safety indicator on the safety situation is divided into multiple safety domains, including personal safety, equipment safety, and environmental safety. The degree of impact in each domain is divided into multiple levels, namely, extremely serious hazard, significant hazard, general hazard, minor hazard, and no hazard. Based on the actual values ​​of the current operational safety indicators of the coal-fired unit, the degree of impact is determined. For example, in this embodiment of the invention, an operational safety indicator may have a degree of impact on personal safety, equipment safety, and environmental safety of general hazard, general hazard, and no hazard, respectively. Each of the five levels and three safety domains has a preset weight value. Therefore, the degree of impact of this operational safety indicator is:

[0051] j = a1·b 13 +a2·b 23 +a3·b 35

[0052] In the formula, j represents the degree of influence of this operational safety indicator, a1 represents the weight value of personal safety, and b 13 a1 represents the general hazard weight value for personal safety, a2 represents the equipment safety weight value, and b... 13 a3 represents the general hazard weight value for equipment safety, b represents the environmental safety weight value, and b represents the environmental safety weight value. 13 This indicates the weight value for environmental safety and lack of hazard.

[0053] In this embodiment of the invention, there are a total of n operational safety indicators, and their weight values ​​are as follows:

[0054]

[0055] In the formula, w i represents the weight of the i-th operational safety indicator, and represents the degree of influence of the i-th operational safety indicator;

[0056] S33 specifically refers to:

[0057] j = s1·w1 + s2·w2 + ... + s n ·w n

[0058] In the formula, s1 represents the first operational safety indicator.

[0059] Furthermore, S4 specifically refers to:

[0060] S41. Calculate the load regulation costs and pollution emission data for all adjustable coal-fired power units;

[0061] S42. Obtain real-time load data of adjustable coal-fired units and historical load data of coal-fired units. Based on the historical load data, determine the average stable load of the current adjustable coal-fired units during the historical peak shaving process, and calculate the difference between the real-time load and the average stable load of all adjustable coal-fired units.

[0062] S43. Standardize the load adjustment cost, pollution emission data, and the difference between real-time load and the average stable load, and assign corresponding weights to the load adjustment cost, pollution emission data, and the difference between real-time load and the average stable load.

[0063] S44. Based on load adjustment costs, pollution emission data, the difference between real-time load and the average stable load, and the corresponding weights, calculate the adjustment priority of all adjustable coal-fired units. Sort all adjustable coal-fired units in descending order of adjustment priority to obtain the load adjustment sequence of adjustable coal-fired units.

[0064] Furthermore, the specific calculation of the load regulation cost for all adjustable coal-fired units is as follows:

[0065] C = C1 + C2 + C3

[0066] In the formula, C is the load adjustment cost, C1 is the adjustment scheme implementation cost, C2 is the fuel increase cost, and C3 is the equipment wear and tear cost.

[0067] Furthermore, the specific calculation of pollution emission data for all adjustable coal-fired power units is as follows:

[0068] f = s i (P i )+n i (P i )

[0069]

[0070] In the formula, f represents the pollutant emission amount, and s i (P i ) represents the SO2 emissions of coal-fired unit i, and n represents the SO2 emissions of coal-fired unit i.i (P i ) represents the NO of coal-fired unit i x Emissions, sα i sβ i α and γ are both SO2 emission characteristic coefficients of coal-fired unit i, and nα is the emission characteristic coefficient of unit i. i nβ i n and γ are both NO from coal-fired unit i. x Emission characteristic coefficient.

[0071] Furthermore, S5 specifically involves: determining the stable load extreme value of the current adjustable coal-fired unit during the historical peak shaving process based on historical load data; using the difference between the real-time load and the stable load extreme value corresponding to the adjustment command as the load regulation capacity of the adjustable coal-fired unit; and allocating load regulation targets to the adjustable coal-fired unit in the order of the load regulation sequence until the real-time load of the total coal-fired unit reaches the target load.

[0072] In this embodiment of the invention, the response scheme in S6 adopts an existing adjustment method.

[0073] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0074] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for controlling 20% ​​load in a coal-fired power unit, characterized in that, Includes the following steps: S1. Obtain the real-time load and target load of the current total coal-fired units, and determine the difference between the real-time load and the target load; S2. Determine the adjustment command for the total coal-fired unit load based on the difference between the real-time load and the target load; S3. Obtain the operating data of the coal-fired units and identify the coal-fired units that can be load-regulated; S4. Determine the load regulation sequence of the adjustable coal-fired power unit based on the operating data of the adjustable coal-fired power unit and the cost data of load regulation. S5. Determine the load regulation capacity of all adjustable coal-fired units and allocate load regulation targets according to the load regulation sequence of the adjustable coal-fired units; S6. Determine the response plan based on the load adjustment target of the adjustable coal-fired unit and adjust the load according to the response plan so that the load of the total coal-fired unit is adjusted to the target load; S4 specifically refers to: S41. Calculate the load regulation costs and pollution emission data for all adjustable coal-fired power units; S42. Obtain real-time load data of adjustable coal-fired units and historical load data of coal-fired units. Based on the historical load data, determine the average stable load of the current adjustable coal-fired units during the historical peak shaving process, and calculate the difference between the real-time load and the average stable load of all adjustable coal-fired units. S43. Standardize the load adjustment cost, pollution emission data, and the difference between real-time load and the average stable load, and assign corresponding weights to the load adjustment cost, pollution emission data, and the difference between real-time load and the average stable load. S44. Based on load adjustment costs, pollution emission data, the difference between real-time load and the average stable load, and the corresponding weights, calculate the adjustment priority of all adjustable coal-fired units, sort all adjustable coal-fired units in descending order of adjustment priority, and obtain the load adjustment sequence of adjustable coal-fired units. The specific calculation of pollution emission data for all adjustable coal-fired power units is as follows: In the formula, f For pollutant emissions, Indicates coal-fired power unit i SO2 emissions, Indicates coal-fired power unit i NO x Emissions , , All are coal-fired units i SO2 emission characteristic coefficient, , , All are coal-fired units i NO x Emission characteristic coefficient.

2. The method for controlling 20% ​​load of a coal-fired power unit according to claim 1, characterized in that, In S2, if the real-time load of the total coal-fired power units is greater than the target load, the adjustment command is to reduce the load; if the real-time load of the total coal-fired power units is less than the target load, the adjustment command is to increase the load.

3. The method for controlling 20% ​​load of a coal-fired power unit according to claim 1, characterized in that, S3 specifically refers to: S31. Obtain operational safety indicators for coal-fired power units; S32. Determine the weight of each operational safety indicator based on its impact on the safety situation; S33. Calculate the safety evaluation score of the coal-fired unit based on the operational safety indicators and their corresponding weights; S34. If the safety evaluation score of a coal-fired unit is greater than the preset threshold, it shall be identified as a coal-fired unit that can be load-regulated.

4. The method for controlling 20% ​​load of a coal-fired power unit according to claim 1, characterized in that, The specific calculation of the load regulation cost for all adjustable coal-fired power units is as follows: In the formula, C For load adjustment costs, To cover the implementation costs of the mediation plan, Increased fuel costs This refers to equipment wear and tear costs.

5. The method for controlling 20% ​​load of a coal-fired power unit according to claim 1, characterized in that, S5 specifically involves: determining the stable load extreme value of the current adjustable coal-fired unit during the historical peak shaving process based on historical load data; using the difference between the real-time load and the stable load extreme value corresponding to the adjustment command as the load regulation capacity of the adjustable coal-fired unit; and allocating load regulation targets to the adjustable coal-fired unit in the order of the load regulation sequence until the real-time load of the total coal-fired unit reaches the target load.

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