Parallel same-type double-unit power distribution method and device

Abstract

The invention discloses a parallel same-type double-unit power distribution method and device. The method comprises the steps of obtaining total generation power issued by a power grid; according to the total power generation power, the minimum relative load rate of a single unit in the parallel same-type double units and the total load rate of the double units are determined; according to the minimum relative load rate and the total load rate, searching a pre-generated power supply coal consumption table for a unit power share enabling the relative coal consumption rate to be minimum; and according to the unit power share and the total generation power, determining loads borne by the two units in the parallel same-type double units. According to the method, total generation power issued by a power grid is taken as an initial basis, a load safe operation lower limit of a single unit and an overall operation condition of double units are calculated and defined, and a subsequent distribution core constraint is delimited; the optimal unit power share is screened according to a pre-generated power supply coal consumption table, the safety constraint is met, and the energy efficiency is optimized; and finally determining respective loads of the two units, accurately matching power grid requirements, and ensuring the safety of the units.

Description

Technical Field

[0001] This application relates to the field of power grid technology, and in particular to a method and equipment for power distribution between two parallel identical generating units. Background Technology

[0002] Current technologies often employ an average power distribution method when allocating power between two parallel, identical generating units. This method poses a direct safety risk in operating scenarios where the total power output from the grid is low. When the total power output from the grid is low, evenly distributing it to two parallel, identical units can result in each unit's load falling below the minimum threshold required for safe operation. Specifically, the turbine's low-pressure cylinder may experience insufficient cooling steam flow due to the low load, failing to meet the cooling needs of the blades and leading to blade overheating. Prolonged operation may also result in increased vibration, causing blade fatigue damage and potentially leading to equipment failure. Simultaneously, the boiler may experience reduced fuel input due to the low load on a single unit, causing the furnace temperature to drop below the minimum required for stable combustion. This can lead to combustion instability issues such as frequent flameouts and localized deflagration, interrupting power generation and potentially increasing equipment maintenance burden due to the accumulation of impurities from incomplete combustion, even triggering serious safety accidents. Summary of the Invention

[0003] In view of the above problems, this application provides a power distribution method and device for parallel identical dual generator units.

[0004] To solve the above-mentioned technical problems, this application proposes the following solution: In a first aspect, this application provides a method for power allocation between two parallel generating units of the same type. The method includes: obtaining the total generating power from the power grid; determining the minimum relative load rate of a single unit and the total load rate of the two units based on the total generating power; finding the unit power share that minimizes the relative coal consumption rate in a pre-generated coal consumption table based on the minimum relative load rate and the total load rate, wherein the relative coal consumption rate indicates the ratio of the overall coal consumption of the parallel generating units of the same type to the coal consumption of a single unit under rated load conditions; and determining the load borne by each of the two units in the parallel generating units of the same type based on the unit power share and the total generating power.

[0005] Secondly, this application provides a power distribution device for parallel-type dual generator units, which includes: The acquisition module is used to acquire the total power generation capacity issued by the power grid. The first determining module is used to determine the minimum relative load rate of a single unit and the total load rate of the two units in parallel with the same type, based on the total power generation. The lookup module is used to find the unit power share that minimizes the relative coal consumption rate in a pre-generated table of power supply coal consumption based on the minimum relative load rate and the total load rate. The relative coal consumption rate is used to indicate the ratio of the overall power supply coal consumption of two parallel units of the same type to the power supply coal consumption of a single unit under rated load conditions. The second determining module is used to determine the load borne by each of the two units in a parallel dual-unit configuration based on the unit power share and the total generating power.

[0006] To achieve the above objectives, according to a third aspect of this application, a storage medium is provided, the storage medium including a stored program, wherein, when the program is running, the device where the storage medium is located is controlled to execute the parallel identical dual-unit power allocation method of the first aspect.

[0007] To achieve the above objectives, according to a fourth aspect of this application, an electronic device is provided, the device including at least one processor, and at least one memory and bus connected to the processor; wherein the processor and memory communicate with each other through the bus; the processor is used to call program instructions in the memory to execute the parallel dual-unit power allocation method of the first aspect described above.

[0008] By employing the above-described technical solution, the technical solution provided in this application has at least the following advantages: This application takes the total power generation capacity allocated by the power grid as the initial basis. First, it calculates and clarifies the safe operating lower limit (minimum relative load factor) of the load of a single unit and the overall operating condition (total load factor) of the two units, thus defining the core constraint boundary for subsequent allocation. Then, it uses a pre-generated coal consumption table for power supply to screen the optimal unit power share, ensuring that the energy efficiency of the two units is optimized while meeting safety constraints. The final determined load of each of the two units can accurately match the total power generation demand of the power grid and ensure that the load of a single unit is always within the safe operating range, effectively avoiding equipment operation problems caused by abnormal load of a single unit, and achieving a balance between safety and efficiency when responding to power grid dispatch for parallel identical units.

[0009] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0010] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A schematic flowchart of a power allocation method for parallel dual-unit grids of the same type provided in an embodiment of this application is shown; Figure 2 This paper illustrates a detailed flowchart of a power allocation method for parallel dual-unit generators of the same type provided in an embodiment of this application. Figure 3 This illustration shows a schematic diagram of the relationship between the load rate of a single unit and the coal consumption correction factor, according to an embodiment of this application. Figure 4 This illustration shows a structural schematic diagram of a parallel dual-unit power distribution device provided in an embodiment of this application; Figure 5 A schematic diagram of the structure of an electronic device provided in an embodiment of this application is shown. Detailed Implementation

[0011] Exemplary embodiments of the present application will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this application will be thorough and complete, and will fully convey the scope of the present application to those skilled in the art.

[0012] In the embodiments of this application, the terms "first," "second," etc., do not have a logical or temporal dependency, nor do they limit the quantity or execution order. It should also be understood that although the following description uses the terms "first," "second," etc., to describe various elements, these elements should not be limited by the terms. These terms are merely used to distinguish one element from another.

[0013] In this application, the term "at least one" means one or more, and the term "multiple" means two or more.

[0014] It should also be understood that the term “if” can be interpreted as “when” or “upon”, or “in response to determination” or “in response to detection”. Similarly, depending on the context, the phrase “if determination…” or “if detection [the stated condition or event]” can be interpreted as “when determination…” or “in response to determination…” or “when detection [the stated condition or event]” or “in response to detection [the stated condition or event]”.

[0015] In power distribution scenarios involving two parallel, identical generating units, existing technologies often employ an average distribution strategy, directly splitting the total power output from the grid equally between the two units. When the total power output from the grid is low, it directly triggers equipment safety risks: after average distribution, the load on a single unit is easily lower than its minimum safe operating threshold, leading to a chain reaction of problems. On one hand, insufficient load on the turbine's low-pressure cylinder means the cooling steam flow cannot meet the blade cooling requirements, directly causing blade overheating; with long-term operation, blade vibration amplitude will gradually increase, causing fatigue damage, and in severe cases, potentially leading to turbine failure and shutdown. On the other hand, due to the low load on a single unit, the boiler needs to reduce the furnace fuel input, which will cause the furnace temperature to drop below the minimum temperature required for stable combustion, resulting in unstable combustion phenomena such as frequent flameouts and localized deflagration; this not only interrupts the power generation process but also increases maintenance costs due to the accumulation of impurities from incomplete fuel combustion inside the equipment, and may even lead to more serious safety accidents such as furnace damage.

[0016] Based on this, this application provides a power allocation method for parallel dual-unit generators of the same type. The power allocation method for parallel dual-unit generators of the same type will be described in detail below with reference to the accompanying drawings. Figure 1 A schematic flowchart illustrating a power allocation method for two parallel, identical generator units provided in this application. Figure 2 This application provides a flowchart illustrating a power allocation method for two parallel, identical generator units. Specifically, it includes the following steps: Step 110: Obtain the total power generation output from the power grid.

[0017] Total power generation capacity is generated and issued by the power grid dispatch center based on the overall operating status of the power system, load demand forecasts, and energy regulation targets. Its core function is to define the total power generation capacity that at least two parallel-operating steam turbine generator units need to undertake as a coordinated whole. For example, when a regional power grid faces a 300MW power shortage during peak electricity consumption periods, and there are two parallel-operating steam turbine generator units in the region that can coordinate power supply, the power grid dispatch center will issue a 300MW total power generation instruction to these two units. This means that these two units need to cooperate and, through reasonable load allocation, ultimately achieve a total output power of 300MW to meet the power demand of the grid.

[0018] Step 120: Based on the total power generation, determine the minimum relative load rate of a single unit and the total load rate of the two parallel units of the same type.

[0019] In the process of parallel operation of two identical generating units in coordination to respond to the power grid's generation demand, if the load rate of a single unit is too low, it will cause the turbine's low-pressure cylinder blades to overheat and vibrate due to insufficient cooling steam flow, and the boiler to experience combustion instability (such as flameout or deflagration) due to excessively low furnace temperature. It will also reduce the unit's response speed to grid load fluctuations. The total load rate of the two units directly determines the direction of the load allocation strategy; therefore, based on the total power generation from the grid, it is necessary to first accurately determine the minimum relative load rate of each unit and the total load rate of the two units.

[0020] When determining the minimum relative load factor for a single unit, the minimum power generation of the single unit is used as the basis, and multi-parameter calculations must be completed in conjunction with the unit's cooling method (wet cooling / air cooling). First, the extraction efficiency is calculated separately for parallel identical units with different cooling types. When the parallel identical units are wet-cooled units, according to... Determine the extraction steam efficiency of parallel dual units Where p is the average absolute pressure of the extraction steam. When two parallel units of the same type are air-cooled units, according to... Determine the extraction steam efficiency of the parallel dual-unit system. Then, based on... Determine the effective steam flow rate entering the low-pressure cylinder ,in, Main steam flow rate, This is the extraction steam volume. Then, based on... Determine the work efficiency of the steam at the low-pressure cylinder inlet, where... This is the enthalpy of the steam at the low-pressure cylinder inlet. This is the steam enthalpy value at the extraction point. This represents the enthalpy of the actual exhaust steam from the low-pressure cylinder. This is the enthalpy of saturated vapor.

[0021] Based on the parameters calculated above, according to Determine the minimum power generation of a single generating unit ,in, For the low-pressure cylinder cooling steam volume of parallel identical twin units, The efficiency of the steam at the low-pressure cylinder inlet. This refers to the plant's electricity consumption. The final amount will be based on... Determine the minimum relative load factor for a single unit ,in, This represents the total generating capacity. The minimum relative load factor is used to limit the lower limit of the load on a single unit, preventing safety risks caused by excessively low load.

[0022] The total load factor of the two units is used to define the overall operating condition of the two units, according to the formula. Calculate, where, For the rated load of a single unit, 2 This refers to the rated load of two generating units. For example, when the rated load of a single generating unit E0 = 600MW, and the total generating power supplied by the grid is E... AGC At 780MW, the total load factor of the two units (i.e., 65%). The core function of this total load factor is to determine the current load range of the two generating units (e.g., F). AGC ≤50% is considered a low load range; 50% <F AGC ≤80% is the medium load range, F AGC >80% is the high load range), which provides a basis for subsequent steps to select power shares. For example, in the low load range, candidates for power shares that cause the load of a single unit to be lower than the minimum power generation of the single unit should be eliminated first, while in the medium and high load range, the focus can be on pursuing the balance of power distribution between the two units to reduce the relative coal consumption rate.

[0023] Step 130: Based on the minimum relative load rate and the total load rate, find the unit power share that minimizes the relative coal consumption rate in the pre-generated power supply coal consumption table.

[0024] The pre-generation of the power supply coal consumption table is the core foundation of the lookup process. Essentially, it establishes the correlation between total load factor, unit power share, and relative coal consumption rate, achieved through multi-dimensional parameter calculations and data processing. Specifically, under different total load factors and different shares of power borne by a single unit relative to the actual total power of the two units, the relative coal consumption rate of the two units is calculated separately. The relative coal consumption rate indicates the ratio of the overall power supply coal consumption of the two units to the power supply coal consumption of a single unit under rated load conditions. The correlation between different total load factors, different unit power shares, and the corresponding relative coal consumption rates is then compiled into the power supply coal consumption table.

[0025] When calculating the relative coal consumption rate of two generating units for each combination of total load factor and power share of a single unit, it is first necessary to clarify the total load factor (F). AGC The range and interval of the power share (γ1) of the single unit (Unit 1) are determined. The total load factor must cover the typical operating load range of parallel dual-unit power generation. Referring to domestic operating data of similar units, it is set to 0.15~0.75 (i.e., 15%~75%), with intervals of 0.05, such as 0.15, 0.20, 0.25…0.75. The power share of the single unit must reflect the proportional difference in power output of the single unit, set to 0.05~0.50 (i.e., 5%~50%), with intervals of 0.05, such as 0.05, 0.10, 0.15…0.50. Furthermore, γ2 = 1 - γ1 (γ2 is the power share of Unit 2), ensuring the sum of the power shares of both units is 1. Based on the total generating power E obtained in step 110… AGC and the power share of a single unit (γ) 1， γ2), determine the power borne by each unit in the dual-unit system, with the power borne by a single unit calculated as E1=EAGC ×γ1、E2=E AGC Calculate ×γ². After calculation, it is necessary to verify that E1+E2 matches E. AGC The deviation must be ≤ ±0.05%. If it exceeds the deviation, E should be read again. AGC The value of γ1 is used to rule out signal transmission errors or incorrect values.

[0026] After determining the power output of each unit in a dual-unit system, the load factor of each unit is determined based on the ratio of its power output to its rated load. That is, F1 = (E1 / E0) × 100% and F2 = (E2 / E0) × 100%, where E0 is the rated load of the unit. For example, when E0 = 600MW and E1 = 19.5MW, F1 = (19.5 / 600) × 100% = 3.25%; when E2 = 370.5MW, F2 = (370.5 / 600) × 100% = 61.75%.

[0027] Furthermore, the coal consumption correction coefficient (K) for each unit is determined based on its load factor (F1, F2). F1 K F2 In one specific implementation, the coal consumption correction coefficient is calculated using an exponential fitting formula, i.e. In another implementation, a piecewise quadratic function fitting formula is used to divide the load factor into multiple intervals, each interval corresponding to different quadratic function coefficients, i.e. .like Figure 3 As shown in the figure, the horizontal axis represents the load rate of a single unit (ranging from 30% to 100%), and the vertical axis represents the coal consumption correction coefficient (ranging from 1.00 to 1.30). The figure also presents the experimentally measured coal consumption correction coefficient data points and the fitted curve. It can be clearly observed from the figure that as the load rate of a single unit gradually increases from 30% to 100%, the coal consumption correction coefficient shows a significant downward trend overall, and the experimental values ​​and the fitted curve show a high degree of agreement. When the load rate exceeds 60%, the rate of decrease in the coal consumption correction coefficient slows down, gradually approaching 1.00. This indicates that under high load conditions, the coal consumption correction coefficient of a single unit is better, and its energy efficiency performance is closer to the ideal state at rated load.

[0028] After determining the coal consumption correction factor, the actual coal consumption for power generation of a single unit is determined based on the rated coal consumption for power supply and the corresponding coal consumption correction factor. That is, according to b1=b0×K F1 b2 = b0 × K F2Calculate the actual coal consumption for power generation of a single generating unit, where b0 is the coal consumption for power generation under the rated load of the single generating unit. The coal consumption for power generation under the rated load of a single generating unit is obtained through a 24-hour continuous stable operation test of the unit under the rated load (E0). During the test, coal consumption data is collected every hour, and the arithmetic mean of the 24-hour data is taken as b0. For example, when b0 = 280 gce / kWh, b1 = 280 × 5.06 = 1416.8 gce / kWh, and b2 = 280 × 1.06 = 296.8 gce / kWh.

[0029] Subsequently, based on the power share of each unit in the dual-unit system, the actual coal consumption for power generation of each unit was weighted and averaged to obtain the coal consumption for power generation of the dual-unit system, i.e., b. AGC =(E1×b1+E2×b2) / E AGC For example, when E1=19.5MW, b1=1416.8gce / kWh, E2=370.5MW, and b2=296.8gce / kWh, b AGC =(19.5×1416.8+370.5×296.8) / 390≈353.06gce / kWh.

[0030] Finally, the ratio of the coal consumption for power generation of the two units to the rated coal consumption for power generation of a single unit is calculated to obtain the relative coal consumption rate corresponding to the combination. That is, β=b AGC / b0. For example, b AGC When ≈353.06gce / kWh and b0=280gce / kWh, β=353.06 / 280≈1.26, indicating that the overall coal consumption for power generation of the two units under the current combination is 1.26 times that of a single unit under rated operating conditions.

[0031] When compiling the relationship between different total load factors, different unit power shares, and corresponding relative coal consumption rates into a power supply coal consumption table, the column dimension of the table is set to total load factor F. AGC (From 0.15 to 0.75, increasing in increments of 0.05), the row dimension is set to the power share γ1 of a single unit (from 0.05 to 0.50, increasing in increments of 0.05), and the β value calculated for the corresponding combination is entered into the table cells. Table 1 provides a table of coal consumption for power supply.

[0032] Table 1. Coal Consumption for Power Supply As can be seen from Table 1, when the total load factor F AGC At higher levels (e.g., 0.75), regardless of the power share of a single unit... γ 1. How to allocate βThe values ​​remained between 1.18 and 1.28, indicating that the overall coal consumption for power supply under high total load conditions for the dual-unit system was closer to the level of a single unit at rated load, demonstrating good energy efficiency. However, as the total load factor... F AGC Reduce (e.g., gradually reduce from 0.75 to 0.15). β The value shows a significant upward trend, especially when the power share of a single unit is... γ When 1 is relatively small (e.g.) γ 1=0.05). F AGC =0.15 β A value of 2.31 indicates that under low total load and with each unit bearing a very small percentage of the power, the overall coal consumption for power supply from two units is significantly higher than that of a single unit under rated operating conditions, resulting in a substantial decrease in energy efficiency. Simultaneously, under the same total load factor, the power share of a single unit... γ The allocation of 1 will also have an impact β Value: based on total load factor F AGC For example, when =0.50, γ When 1 increases from 0.05 to 0.50, β The value gradually decreased from 1.33 to 1.40, reflecting a more balanced power distribution between the two units. γ The trend is that the lower the relative coal consumption rate (1 is close to 0.50).

[0033] To transform the discrete correspondence between total load factor, power share of individual units, and relative coal consumption rate in Table 1 into a continuous and usable functional relationship, methods such as polynomial bivariate fitting, interpolation, or neural networks can be used to process the data. The following explanation uses polynomial bivariate fitting as an example. A bivariate quadratic or cubic polynomial form is selected; for example, a bivariate quadratic polynomial can be expressed as... Where a0 to a5 are coefficients to be determined, then all F in Table 1 are... AGC , γ 1, β Substituting the data into the polynomial, a system of equations is constructed using the least squares method, making the actual... β Obtained by polynomial calculation β The coefficients are solved by minimizing the sum of squared residuals, and then the coefficients of determination R are used. 2 To verify the fit, R 2 The closer R is to 1, the higher the fitting accuracy. 2 If the value is less than 0.95, the degree of the polynomial is increased.

[0034] To avoid discrepancies between the coal consumption meter readings and actual operating conditions caused by equipment aging and changes in the operating environment, the relative coal consumption rate in the table needs to be dynamically corrected using historical operating data to ensure the accuracy of the results. The correction process requires first obtaining historical operating data for both units, including actual total load factor, unit power share, and measured coal consumption for power supply. For example, after 5 years of operation, a historical data point might show F... AGC_act =0.65, γ 1_act When b = 0.05, AGC_mea =355.2 gce / kWh. Then, based on the cumulative operating time t of the two units and the energy efficiency degradation coefficient k, the measured coal consumption for power supply is corrected for the time dimension. The energy efficiency degradation coefficient k is calculated using heat balance test data of the new unit and the current unit. For example, if the new unit's b0 = 280 gce / kWh, and after 5 years of operation b0 increases to 302 gce / kWh, the annual average degradation rate k is calculated as (302 - 280) / 280 / 5 = 1.57%. The correction formula is b... AGC_cor =b AGC_mea ×[1+k×(t / 8760)]. In the example above, t=43800h, and the correction factor is 1+1.57%×5=1.0785. For a certain b... AGC_mea The record of 355.2 gce / kWh, after correction, becomes 355.2 × 1.0785 ≈ 383.3 gce / kWh, reflecting the impact of equipment aging on coal consumption. The corresponding theoretical dual-unit coal consumption is found in the power supply coal consumption table based on the actual total load rate and unit power share from historical operating data. When looking up the theoretical value in the power supply coal consumption table, if the historical data F... AGC_act =0.62, using bilinear interpolation: horizontally in F AGC =Interpolation between 0.60 and 0.65, and vertical interpolation between γ1=0.05 and 0.10. Taking γ1=0.05 as an example, F AGC =0.60 corresponds to β=1.28, F AGC =0.65 corresponds to β=1.26, ΔF=0.05 corresponds to a change of β of -0.02, therefore F AGC When β = 0.62, β = 1.28 - 0.02 × (0.62 - 0.60) / 0.05 = 1.272, and the theoretical coal consumption for power supply is b. AGC_theo =280 × 1.272 = 356.16 gce / kWh. According to δ = |(b AGC_cor -b AGC_theo ) / b AGC_theo | ×100% calculates the deviation rate between the measured coal consumption for power generation of the two generating units and the theoretical coal consumption for power generation of the two generating units after correction. In the above case, δ=|383.3-356.16| / 356.16≈7.62%, exceeding the preset threshold of 5%, triggering the correction process. At this time, all historical data with δ>5% (such as F) are collected.AGC When γ = 0.65 and γ1 = 0.05, there are 12 sets of data with a mean δ of 7.3%. The least squares method is used to fit the original fitted function β = f(F AGC The coefficients β and γ1 are corrected. Taking a bivariate quadratic polynomial as an example, the original coefficients a0=1.18, a1=0.25, a2=-0.5. After adding the correction data, the new coefficients are adjusted to a0=1.22, a1=0.30, a2=-0.6, so that the corrected β=1.22+0.3×0.65-0.6×0.05=1.34, which is closer to the measured value 383.3 / 280≈1.37, ensuring that the coal consumption meter for power supply always matches the current operating status of the unit.

[0035] Finally, the optimal power share is found by combining the constraint of minimum relative load factor. The core is to select the most energy-efficient scheme under the premise of ensuring the safe operation of the units. First, it is determined whether the total load factor of the two units is less than or equal to a preset threshold (this threshold is set according to the unit type and operating standards, usually a critical value for low load range, such as 0.50). If it is in the low load range, all corresponding unit power share candidate values ​​within the range where the total load factor is less than or equal to the preset threshold are extracted from the power supply coal consumption table. For example, when the total load factor = 0.40 (≤0.50), candidate values ​​such as γ1 = 0.05, 0.10...0.50 are extracted. Then, based on the total power generation E... AGC Calculate the actual load of a single unit for each candidate value (E1=E AGC ×γ1), and compared with the minimum power generation E of a single unit determined in step 120. min The comparison is performed, and the candidate power share values ​​for each unit, where the actual load of the single unit is less than the minimum power generation of the single unit, are eliminated. For example, E AGC When the total load factor is 390MW, the candidate value E1 corresponding to γ1=0.05 is 19.5MW < 30MW, and this candidate value needs to be eliminated to avoid safety issues such as low-pressure cylinder blade overheating and unstable boiler combustion caused by excessively low load on a single unit. Finally, among the remaining valid candidate values, the power share with the smallest relative coal consumption rate β corresponding to the power supply coal consumption table is found. For example, when the total load factor is 0.40, the remaining candidate values ​​are γ1=0.08 (assuming correction) and above, among which β=1.61 corresponding to γ1=0.50 is the minimum value, which is the optimal unit power share. If the total load factor is greater than the threshold (medium-high load range), there is no need to eliminate candidate values. The power share with the smallest β can be directly found in the row corresponding to the total load factor in the table. For example, when the total load factor is 0.75, β=1.18 corresponding to γ1=0.45 and 0.50 is the minimum value. At this time, the power distribution between the two units is more balanced, and the energy efficiency is optimal.

[0036] Step 140: Determine the load borne by each of the two units in a parallel dual-unit configuration based on the unit power share and total power generation.

[0037] After obtaining the total power generation in step 110 and determining the unit power share in step 130, the specific load of each unit is calculated based on the unit power share and the total power generation. That is, the load borne by Unit 1 is E1 = E AGC ×γ1, the load E2 borne by Unit 2 is E AGC Since γ2 = 1 - γ1, we can further derive E2 = E AGC ×(1-γ1), this ensures that the sum of the loads of the two generating units perfectly matches the total generating capacity supplied by the grid, with no power shortfall or overcapacity. For example, if the optimal power share selected in step 130 is γ1=0.50, E AGC =390MW, then the load of Unit 1 is E1=390MW×0.50=195MW, and the load of Unit 2 is E2=390MW×(1-0.50)=195MW. If the optimal power share is γ1=0.45, then E1=390MW×0.45=175.5MW, and E2=390MW×0.55=214.5MW.

[0038] In summary, this application takes the total power generation capacity allocated by the power grid as the initial basis. First, it calculates and clarifies the safe operating lower limit (minimum relative load factor) of the load of a single unit and the overall operating condition (total load factor) of the two units, thus defining the core constraint boundary for subsequent allocation. Then, it uses a pre-generated coal consumption table for power supply to screen the optimal unit power share, ensuring that the energy efficiency of the two units is optimized while meeting safety constraints. The final determined load of each of the two units can accurately match the total power generation demand of the power grid and ensure that the load of a single unit is always within the safe operating range, effectively avoiding equipment operation problems caused by abnormal load of a single unit, and achieving a balance between safety and efficiency when responding to power grid dispatch for parallel identical units.

[0039] It is understood that, in order to achieve the functions in the above embodiments, the computer device includes hardware structures and / or software modules corresponding to the execution of each function. Those skilled in the art should readily recognize that, based on the units and method steps described in conjunction with the embodiments disclosed in this application, this application can be implemented in hardware or a combination of hardware and computer software. Whether a function is executed by hardware or by computer software driving hardware depends on the specific application scenario and design constraints of the technical solution.

[0040] Furthermore, as a response to the above Figure 1The implementation of the method embodiment shown in this application provides a parallel dual-unit power distribution device. The embodiment of this device corresponds to the foregoing method embodiment. For ease of reading, this embodiment will not repeat the details of the foregoing method embodiment, but it should be understood that the device in this embodiment can correspondingly implement all the contents of the foregoing method embodiment. Specifically, as shown... Figure 4 As shown, the parallel dual-unit power distribution device 400 includes: The acquisition module 410 is used to acquire the total power generation power issued by the power grid; The first determining module 420 is used to determine the minimum relative load rate of a single unit and the total load rate of the two units in parallel identical dual-unit configuration based on the total power generation. The lookup module 430 is used to find the unit power share that minimizes the relative coal consumption rate in a pre-generated table of power supply coal consumption based on the minimum relative load rate and the total load rate. The relative coal consumption rate is used to indicate the ratio of the overall power supply coal consumption of two parallel units of the same type to the power supply coal consumption of a single unit under rated load conditions. The second determining module 440 is used to determine the load borne by each of the two units in a parallel dual-unit configuration based on the unit power share and the total generating power.

[0041] Furthermore, such as Figure 4 As shown, the parallel dual-unit power distribution device 400 also includes a generation module 450, which is used to calculate the relative coal consumption rate of the dual units under different total load rates and different shares of power undertaken by a single unit to the actual total power of the dual units. The relative coal consumption rate is used to indicate the ratio of the overall power supply coal consumption of the dual units to the power supply coal consumption of a single unit under rated load conditions. The relationship between different total load rates, different unit power shares and corresponding relative coal consumption rates is compiled into a power supply coal consumption table.

[0042] Furthermore, such as Figure 4 As shown, the generation module 450 is specifically used for each combination of total load factor and power share of a single unit. Based on the actual total power of the two units and the power share of each single unit, it determines the power borne by each unit in the two-unit system; based on the ratio of the power borne by a single unit to its rated load, it determines the load factor of a single unit; based on the load factor of a single unit, it determines the corresponding coal consumption correction coefficient; based on the rated power supply coal consumption of a single unit and its corresponding coal consumption correction coefficient, it determines the actual power supply coal consumption of a single unit; according to the power share of each unit in the two-unit system, it performs a weighted average of the actual power supply coal consumption of each unit to obtain the power supply coal consumption of the two-unit system; and it calculates the ratio of the power supply coal consumption of the two-unit system to the rated power supply coal consumption of a single unit to obtain the relative coal consumption rate corresponding to the combination.

[0043] Furthermore, such as Figure 4As shown, the generation module 450 is specifically used to acquire historical operating data of the two generating units. The historical operating data includes the actual total load rate, unit power share, and measured coal consumption for power supply. Based on the cumulative operating time and energy efficiency attenuation coefficient of the two generating units, the measured coal consumption for power supply is corrected in the time dimension. According to the actual total load rate and unit power share in the historical operating data, the corresponding theoretical coal consumption for power supply of the two generating units is found in the coal consumption table for power supply. The deviation rate between the corrected measured coal consumption for power supply of the two generating units and the theoretical coal consumption for power supply of the two generating units is calculated. When the deviation rate exceeds a preset threshold, the relative coal consumption rate is corrected using the least squares method.

[0044] Furthermore, such as Figure 4 As shown, the first determining module 420 is specifically used to determine based on Determine the minimum power generation of a single generating unit ,in, For the low-pressure cylinder cooling steam volume of parallel identical twin units, The efficiency of the steam at the low-pressure cylinder inlet. Electricity consumption for the plant; according to Determine the minimum relative load factor for a single unit ,in, Total power generation; according to Determine the total load factor of the two units ,in, This is the rated load of a single unit.

[0045] Furthermore, such as Figure 4 As shown, the first determining module 420 is specifically used when the parallel identical units are wet-cooled units, according to... Determine the extraction steam efficiency of parallel dual units Where p is the average absolute pressure of the extraction steam; when the parallel twin units of the same type are air-cooled units, according to Determine the extraction steam efficiency of the parallel dual units; based on Determine the effective steam flow rate entering the low-pressure cylinder ,in, Main steam flow rate, For extraction steam volume; according to Determine the work efficiency of the steam at the low-pressure cylinder inlet, where... This is the enthalpy of the steam at the low-pressure cylinder inlet. This is the steam enthalpy value at the extraction point. This represents the enthalpy of the actual exhaust steam from the low-pressure cylinder. This is the enthalpy of saturated vapor.

[0046] Furthermore, such as Figure 4As shown, the lookup module 430 is specifically used to extract all corresponding unit power share candidate values ​​within the range where the total load rate is less than or equal to a preset threshold from the power supply coal consumption table; calculate the actual load of a single unit corresponding to each unit power share candidate value, and compare the actual load of a single unit corresponding to each unit power share candidate value with the minimum power generation of a single unit; remove the unit power share candidate values ​​where the actual load of a single unit corresponding to each unit power share candidate value is less than the minimum power generation of a single unit; and find the unit power share that minimizes the relative coal consumption rate among the remaining unit power share candidate values.

[0047] Optionally, the parallel dual-unit power distribution device can be an electronic device with data processing capabilities, or a functional module within that electronic device, without limitation.

[0048] For example, the electronic device can be a server, which can be a single server or a server cluster consisting of multiple servers. As another example, the electronic device can be a mobile phone, tablet computer, desktop computer, laptop computer, handheld computer, notebook computer, ultra-mobile personal computer (UMPC), netbook, as well as cellular phone, personal digital assistant (PDA), augmented reality (AR), virtual reality (VR) device, and other terminal devices. Furthermore, the electronic device can also be a recording device, video surveillance device, etc. This application does not impose any special limitations on the specific form of the electronic device.

[0049] The following example uses a parallel, identical dual-unit power distribution device as an electronic device, such as... Figure 5 As shown, Figure 5 The hardware structure of an electronic device 500 provided in this application.

[0050] like Figure 5 As shown, the electronic device 500 includes a processor 510, a communication line 520, and a communication interface 530.

[0051] Optionally, the electronic device 500 may also include a memory 540. The processor 510, memory 540, and communication interface 530 can be connected via a communication line 520.

[0052] The processor 510 can be a central processing unit (CPU), a general-purpose processor, a network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof. The processor 510 can also be any other device with processing capabilities, such as a circuit, device, or software module, without limitation.

[0053] In one example, processor 510 may include one or more CPUs, for example Figure 5 CPU0 and CPU1 in the CPU.

[0054] As an optional implementation, the electronic device 500 may include multiple processors; for example, in addition to processor 510, it may also include processor 570. A communication line 520 is used to transmit information between the components included in the electronic device 500.

[0055] Communication interface 530 is used for communication with other devices or other communication networks. This other communication network can be Ethernet, Radio Access Network (RAN), Wireless Local Area Network (WLAN), etc. Communication interface 530 can be a module, circuit, transceiver, or any device capable of enabling communication.

[0056] Memory 540 is used to store instructions. These instructions can be computer programs.

[0057] The memory 540 may be a read-only memory (ROM) or other type of static storage device capable of storing static information and / or instructions; it may also be a random access memory (RAM) or other type of dynamic storage device capable of storing information and / or instructions; it may also be an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital universal optical discs, Blu-ray discs, etc.), disk storage media, or other magnetic storage devices, etc., without limitation.

[0058] It should be noted that the memory 540 can exist independently of the processor 510, or it can be integrated with the processor 510. The memory 540 can be used to store instructions, program code, or some data, etc. The memory 540 can be located inside or outside the electronic device 500, without restriction.

[0059] The processor 510 is configured to execute instructions stored in the memory 540 to implement the communication method provided in the following embodiments of this application. For example, when the electronic device 500 is a terminal or a chip in a terminal, the processor 510 can execute instructions stored in the memory 540 to implement the steps performed by the sending end in the following embodiments of this application.

[0060] As an optional implementation, the electronic device 500 also includes an output device 550 and an input device 560. The output device 550 can be a display screen, speaker, or other device capable of outputting data from the electronic device 500 to the user. The input device 560 can be a keyboard, mouse, microphone, joystick, or other device capable of inputting data into the electronic device 500.

[0061] It should be pointed out that, Figure 5 The structure shown does not constitute a limitation on the electronic device, except... Figure 5 In addition to the components shown, the electronic device may include more or fewer components than illustrated, or combine certain components, or have different component arrangements.

[0062] The parallel-type dual-unit power distribution device and application scenarios described in this application are for the purpose of more clearly illustrating the technical solutions of this application, and do not constitute a limitation on the technical solutions provided in this application. As those skilled in the art will know, with the evolution of parallel-type dual-unit power distribution devices and the emergence of new business scenarios, the technical solutions provided in this application are also applicable to similar technical problems.

[0063] This application provides a storage medium storing a program that, when executed by a processor, implements the power allocation method for parallel dual-unit power distribution.

[0064] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0065] In a typical configuration, the device includes one or more processors (CPUs), memory, and a bus. The device may also include input / output interfaces, network interfaces, etc.

[0066] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, like read-only memory (ROM) or flash RAM, and memory includes at least one memory chip. Memory is an example of computer-readable media.

[0067] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0068] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0069] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0070] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A method for power allocation between two parallel, identical generator units, characterized in that, The method includes: Obtain the total power generation capacity assigned by the power grid; Based on the total power generation, determine the minimum relative load rate of a single unit in a parallel dual-unit configuration, as well as the total load rate of the dual-unit configuration; Based on the minimum relative load rate and the total load rate, the unit power share that minimizes the relative coal consumption rate is found in the pre-generated coal consumption table for power supply. The relative coal consumption rate is used to indicate the ratio of the overall coal consumption for power supply of the parallel identical dual units to the coal consumption for power supply of a single unit under rated load conditions. Based on the power share of the generating units and the total power generation, the load borne by each of the two generating units in the parallel identical dual generating units is determined.

2. The method according to claim 1, characterized in that, The method further includes: Under different total load rates and different proportions of the power undertaken by a single unit to the actual total power of the two units, the relative coal consumption rate of the two units is calculated respectively. The relative coal consumption rate is used to indicate the ratio of the overall power supply coal consumption of the two units to the power supply coal consumption of a single unit under rated load conditions. The correlation between different total load rates, different unit power shares and corresponding relative coal consumption rates is compiled into a table of coal consumption for power supply.

3. The method according to claim 2, characterized in that, Under different total load rates and different proportions of the power borne by a single unit to the actual total power of the two units, the relative coal consumption rate of the two units is calculated, including: For each combination of total load factor and power share of a single unit, the power undertaken by each unit in the dual units is determined based on the actual total power of the dual units and the power share of a single unit. The load factor of a single generating unit is determined based on the ratio of the power borne by the single generating unit to the rated load of the single generating unit. The coal consumption correction coefficient for a single unit is determined based on the load rate of that single unit. The actual coal consumption for power supply of a single generating unit is determined based on the rated coal consumption for power supply of the single generating unit and the corresponding coal consumption correction coefficient. According to the power share of each unit in the dual-unit system, the actual coal consumption for power supply of each unit is weighted and averaged to obtain the coal consumption for power supply of the dual-unit system. The ratio of the coal consumption for power supply of the dual-unit generator set to the rated coal consumption for power supply of a single unit is calculated to obtain the relative coal consumption rate corresponding to the combination.

4. The method according to claim 3, characterized in that, The method further includes: Obtain historical operating data of the two generating units, including actual total load rate, unit power share, and measured coal consumption for power supply. The measured coal consumption for power supply is corrected in the time dimension based on the cumulative operating time and energy efficiency attenuation coefficient of the dual units. Based on the actual total load rate and unit power share in the historical operating data, find the corresponding theoretical dual-unit power supply coal consumption in the power supply coal consumption table; Calculate the deviation rate between the corrected measured coal consumption for power generation of the two generating units and the theoretical coal consumption for power generation of the two generating units; When the deviation rate exceeds a preset threshold, the relative coal consumption rate is corrected using the least squares method.

5. The method according to any one of claims 1-4, characterized in that, Based on the total power generation, determine the minimum relative load factor of each individual unit in a parallel pair of identical generating units, and the total load factor of the two generating units, including: according to Determine the minimum power generation of a single generating unit ,in, The amount of cooling steam for the low-pressure cylinder of parallel dual-unit architecture and the efficiency of the steam at the low-pressure cylinder inlet for power generation. Electricity consumption for the plant; according to Determine the minimum relative load factor for a single unit ,in, The total power generation is mentioned; according to Determine the total load factor of the dual units. ,in, This is the rated load of a single unit.

6. The method according to claim 5, characterized in that, The method further includes: When the parallel identical twin units are wet-cooled units, according to Determine the extraction steam efficiency of the parallel dual units Where p is the average absolute pressure of the extraction steam; When the parallel identical twin units are air-cooled units, according to Determine the extraction steam efficiency of the parallel dual units; according to Determine the effective steam flow rate entering the low-pressure cylinder ,in, Main steam flow rate, This refers to the amount of steam extracted; according to Determine the work efficiency of the steam at the low-pressure cylinder inlet, where... This is the enthalpy of the steam at the low-pressure cylinder inlet. This is the steam enthalpy value at the extraction point. This represents the enthalpy of the actual exhaust steam from the low-pressure cylinder. This is the enthalpy of saturated steam.

7. The method according to claim 5, characterized in that, When the total load rate of the two generating units is less than or equal to a threshold, the power share of the generating unit that minimizes the relative coal consumption rate is found in a pre-generated power supply coal consumption table based on the minimum relative load rate and the total load rate, including: Extract all corresponding candidate values ​​of unit power share within the range where the total load rate is less than or equal to the preset threshold from the power supply coal consumption table; Calculate the actual load of a single unit corresponding to each candidate power share value, and compare the actual load of a single unit corresponding to each candidate power share value with the minimum power generation of the single unit. Candidates for the power share of each unit whose actual load is less than the minimum power generation of the unit are eliminated. Among the remaining unit power share candidates, find the unit power share that minimizes the relative coal consumption rate.

8. A power distribution device for parallel identical dual generator units, characterized in that, The device includes: The acquisition module is used to acquire the total power generation capacity issued by the power grid. The first determining module is used to determine the minimum relative load rate of a single unit in a parallel dual-unit configuration and the total load rate of the dual-unit configuration based on the total power generation. The lookup module is used to find the unit power share that minimizes the relative coal consumption rate in a pre-generated coal consumption table based on the minimum relative load rate and the total load rate. The relative coal consumption rate is used to indicate the ratio of the overall coal consumption of the parallel identical units to the coal consumption of a single unit under rated load conditions. The second determining module is used to determine the load borne by each of the two units in the parallel identical dual-unit configuration based on the unit power share and the total power generation.

9. A storage medium, characterized in that, The storage medium includes a stored program, wherein, when the program is executed, it controls the device where the storage medium is located to perform the power allocation method for parallel identical dual-unit systems as described in any one of claims 1-7.

10. An electronic device, characterized in that, The device includes at least one processor, at least one memory connected to the processor, and a bus; wherein the processor and the memory communicate with each other through the bus; the processor is used to call program instructions in the memory to execute the power allocation method for parallel dual-unit power distribution as described in any one of claims 1-7.

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