A thermal power unit primary frequency modulation control method, system, device and storage medium

Abstract

The present application relates to thermal power plant thermal control technical field, especially a kind of thermal power unit primary frequency modulation control method, system, equipment and storage medium, comprising: according to the frequency of unit and primary frequency modulation dead zone of adjacent collection time before and after, judge primary frequency modulation action state;According to primary frequency modulation action state, obtain primary frequency modulation starting time and primary frequency modulation reference load value;According to unit theoretical load adjustment demand and load adjustment demand correction value, calculate the actual load adjustment demand of thermal power unit at each time in primary frequency modulation process;According to actual load adjustment demand, with predetermined collaborative frequency modulation control mode and participation timing to thermal power unit for primary frequency modulation processing.The present application adopts high governor and other frequency modulation mode to participate in primary frequency modulation, simultaneously corrects real-time frequency modulation load adjustment demand according to load adjustment demand correction value, guarantees that output response index and electric quantity contribution index meet the examination requirement, guarantees the safety and stability of power grid.

Description

Technical Field

[0001] This invention relates to the field of thermal control technology for thermal power plants, and in particular to a method, system, equipment, and storage medium for primary frequency regulation control of thermal power units. Background Technology

[0002] The power grid frequency is a measure of the balance between power generation and power load. Maintaining the stability of the power grid frequency is an important means to ensure the safe operation of the power grid. When the power consumption and power generation are inconsistent, the power grid frequency will deviate from the rated frequency. At this time, all generating units that need to be connected to the grid will automatically adjust their power generation according to the deviation between the actual frequency and the rated frequency of the power grid to maintain the stability of the power grid frequency. As an important component supporting the stability of the power grid frequency, the primary frequency regulation performance of thermal power units reflects their ability to regulate the power grid frequency. Primary frequency regulation refers to the process by which generating units automatically adjust their power generation to maintain the stability of the power grid frequency when the power grid frequency exceeds the frequency regulation dead zone. As the proportion of renewable energy power generation in the power grid gradually increases, the intermittency and volatility of renewable energy power generation have put forward higher requirements for the stability of the power grid frequency, thus putting forward higher requirements for the primary frequency regulation capability of thermal power units.

[0003] The National Energy Administration requires all grid-connected power plants to have primary frequency regulation capabilities and be put into operation. Their primary frequency regulation performance must meet the requirements of the power dispatching agency to which they belong. The primary frequency regulation indicators of generator units mainly include response delay, 15-second output response index, 30-second output response index, and power contribution index. For example, for coal-fired power units, the primary frequency regulation process should meet the following requirements: response delay less than 4 seconds, 15-second output response index not less than 75%, 30-second output response index not less than 90%, and power contribution index not less than 75%.

[0004] Currently, traditional primary frequency regulation control strategies typically employ open-loop control to adjust the active power of generating units based on the frequency deviation and the calculated frequency regulation load demand. This approach not only requires calculating the corresponding performance indicators only after the primary frequency regulation process is complete, but also faces challenges due to numerous influencing factors, irregular load fluctuations, and relatively large fluctuations compared to the frequency regulation load adjustment. This makes primary frequency regulation control difficult, often resulting in one or more performance indicators failing to meet the requirements after the frequency regulation ends, impacting the safety and stability of the power grid. Furthermore, the use of only high-voltage gate frequency regulation during the frequency regulation process leads to significant high-voltage gate throttling losses, reducing the efficiency of unit operation. Summary of the Invention

[0005] This invention provides a primary frequency regulation control method, system, equipment, and storage medium for thermal power units. The technical problem it solves is that traditional primary frequency regulation control strategies use open-loop control, and the performance indicators can only be calculated after the primary frequency regulation process is completed. The performance indicators are not calculated in a timely manner and lack feedback correction, which easily leads to situations where the performance indicators do not meet the requirements. Moreover, only the high-voltage gate frequency regulation method is used during the frequency regulation process, and the high-voltage gate throttling loss is large, which affects the unit efficiency.

[0006] To address the above technical problems, this invention provides a method, system, equipment, and storage medium for primary frequency regulation control of thermal power units.

[0007] In a first aspect, the present invention provides a primary frequency regulation control method for thermal power units, the method comprising the following steps:

[0008] The unit frequency of the thermal power unit is collected in real time at each collection moment, and the primary frequency regulation action status and unit load regulation mode are determined based on the unit frequency at adjacent collection moments and the preset primary frequency regulation dead zone.

[0009] Based on the primary frequency regulation operation status, obtain the primary frequency regulation start time and the primary frequency regulation reference load value;

[0010] Based on the frequency difference between the unit frequency at each moment during the primary frequency regulation process and the primary frequency regulation dead zone, the corresponding theoretical load adjustment demand of the unit is obtained.

[0011] In the unit load regulation mode, the load adjustment demand correction value at each moment is obtained based on the primary frequency regulation reference load value, the actual unit load of the thermal power unit at each moment during the primary frequency regulation process, and the theoretical load adjustment demand of the unit; the load adjustment demand correction value includes a first load adjustment demand correction value and a second load adjustment demand correction value.

[0012] Based on the theoretical load adjustment demand of the unit and the correction value of the load adjustment demand, calculate the actual load adjustment demand of the thermal power unit at each moment during the primary frequency regulation process;

[0013] The demand is adjusted according to the actual load at each time point, and the thermal power unit is subjected to primary frequency regulation processing in a predetermined coordinated frequency regulation control mode and participation sequence.

[0014] In a further implementation scheme, the step of determining the primary frequency regulation operation status and unit load adjustment mode based on the unit frequency at adjacent acquisition times and a preset primary frequency regulation dead zone includes:

[0015] Determine whether the unit frequency collected at the current acquisition time exceeds the preset primary frequency regulation dead zone. If the unit frequency collected at the current acquisition time does not exceed the primary frequency regulation dead zone, continue to collect the unit frequency of the thermal power unit at the next acquisition time, and determine whether the unit frequency collected at the next acquisition time exceeds the preset primary frequency regulation dead zone.

[0016] If the unit frequency acquired at the current acquisition time exceeds the primary frequency regulation dead zone, it is determined whether the unit frequency acquired at the previous acquisition time exceeds the preset primary frequency regulation dead zone. If it is determined that the unit frequency acquired at the previous acquisition time is within the primary frequency regulation dead zone, the primary frequency regulation action status is determined to be the new primary frequency regulation action start status, and the current acquisition time is taken as the primary frequency regulation start time for the thermal power unit to enter the new primary frequency regulation action. If it is determined that the unit frequency acquired at the previous acquisition time is outside the primary frequency regulation dead zone, the primary frequency regulation action status is determined to be the previous frequency regulation action running status, and the stored primary frequency regulation start time for the thermal power unit to enter the previous frequency regulation action is retrieved.

[0017] If the unit frequency collected at the current time is less than the lower limit of the primary frequency regulation dead zone, then the unit load adjustment mode is determined to be the unit frequency regulation load increase mode.

[0018] If the unit frequency collected at the current time is greater than the upper limit of the primary frequency regulation dead zone, then the unit load adjustment mode is determined to be the unit frequency regulation and load reduction mode.

[0019] In a further implementation, the method for obtaining the primary frequency regulation reference load value includes any one of the following: using the unit load at the start time of primary frequency regulation as the primary frequency regulation reference load value; using the average unit load within a preset reference time before the start time of primary frequency regulation as the primary frequency regulation reference load value; or using the maximum value of the unit load in the frequency regulation load increase mode or the minimum value in the frequency regulation load decrease mode within a preset reference time before the start time of primary frequency regulation as the primary frequency regulation reference load value.

[0020] In a further implementation scheme, the formula for calculating the theoretical load adjustment demand of the unit is as follows:

[0021]

[0022] in,

[0023] ΔP E (t)|≤K P ×P N

[0024] In the formula, ΔP E(t) represents the theoretical load adjustment demand of the thermal power unit at time t during the primary frequency regulation process; Δf(t) represents the frequency difference between the unit frequency at time t and the primary frequency regulation dead zone during the primary frequency regulation process; P N Indicates the rated power of the thermal power unit; f n Indicates the rated frequency of the thermal power unit; δ represents the speed variability rate; K P This indicates the percentage of the maximum output limit for thermal power units.

[0025] In a further implementation scheme, the step of obtaining the first load adjustment demand correction value specifically includes:

[0026] Based on the actual unit load of the thermal power unit at each moment during the primary frequency regulation process and the primary frequency regulation reference load value, the actual maximum output adjustment of the thermal power unit from the start of the primary frequency regulation to the present is obtained.

[0027] Based on the theoretical load adjustment demand of the unit, obtain the theoretical maximum output adjustment amount from the start time of the primary frequency regulation to the present.

[0028] In the unit load regulation mode, the first load regulation demand correction value is obtained based on the actual maximum output adjustment amount, the theoretical maximum output adjustment amount, and the preset first correction coefficient.

[0029] In the unit frequency regulation and load increase mode, the calculation formula for the correction value of the first load adjustment demand is as follows:

[0030] ΔP1(t)=max(K1×(ΔP E,max (t)-ΔP S,max (t)),0)

[0031] Under the unit frequency regulation and load reduction mode, the calculation formula for the correction value of the first load adjustment demand is:

[0032] ΔP1(t)=min(K1×(ΔP E,max (t)-ΔP S,max (t)),0)

[0033] in,

[0034]

[0035]

[0036] In the formula, ΔP1(t) represents the correction value for the first load adjustment demand; K1 represents the preset first correction coefficient; ΔP E,max (t) represents the thermal power unit from the start time t of primary frequency regulation. A The theoretical maximum output adjustment at time t; ΔPS,max (t) represents the thermal power unit from the start time t of primary frequency regulation. A The actual maximum output adjustment at time t; P S (t) represents the actual unit load of the thermal power unit at time t during the primary frequency regulation process; P0 represents the primary frequency regulation reference load value; ΔP E (t) represents the theoretical load adjustment demand of the thermal power unit at time t during a primary frequency regulation process.

[0037] In a further implementation scheme, the step of obtaining the second load adjustment demand correction value specifically includes:

[0038] The actual power contribution of the thermal power unit is calculated based on the actual unit load during the primary frequency regulation process from the start of the primary frequency regulation to the present and the primary frequency regulation reference load value.

[0039] Calculate the theoretical power contribution of the thermal power unit based on the theoretical load adjustment demand of the unit from the start of the primary frequency regulation to the present during the primary frequency regulation process.

[0040] In the unit load regulation mode, the second load regulation demand correction value is obtained based on the actual contributed power, the theoretical contributed power, the frequency regulation duration and the preset second correction coefficient.

[0041] In the unit frequency regulation and load increase mode, the calculation formula for the correction value of the second load adjustment demand is as follows:

[0042] ΔP2(t)=max(K2×(ΔQ E (t)-ΔQ S (t)) / ΔT,0)

[0043] Under the unit frequency regulation and load reduction mode, the calculation formula for the correction value of the second load adjustment demand is as follows:

[0044] ΔP2(t)=min(K2×(ΔQ E (t)-ΔQ S (t)) / ΔT,0)

[0045] in,

[0046]

[0047]

[0048] In the formula, ΔP2(t) represents the correction value for the second load adjustment demand; ΔT represents the duration of the primary frequency regulation process, i.e., the current time minus the start time of the primary frequency regulation; K2 represents the preset second correction coefficient; ΔQ E(t) represents the thermal power unit from the start time t of primary frequency regulation. A The theoretical contribution of electricity up to time t; ΔQ S (t) represents the thermal power unit from the start time t of primary frequency regulation. A The actual electricity contribution at time t; P S (t) represents the actual unit load of the thermal power unit at time t during the primary frequency regulation process; P0 represents the primary frequency regulation reference load value; ΔP E (t) represents the theoretical load adjustment demand of the thermal power unit at time t during a primary frequency regulation process.

[0049] In a further implementation, the step of adjusting the demand based on the actual load at each time point, and performing primary frequency regulation on the thermal power unit using a predetermined coordinated frequency regulation control mode and participation timing includes:

[0050] All frequency modulation methods that meet the conditions for participating in primary frequency modulation are selected from those other than high-key frequency modulation methods, and these are designated as cooperative frequency modulation methods.

[0051] Determine the cooperative frequency modulation control mode of the cooperative frequency modulation mode and the high-gate frequency modulation mode;

[0052] Based on the actual load adjustment demand and the predetermined frequency regulation input strategy, the unit frequency regulation instructions and participation sequence for each frequency regulation mode during the frequency regulation time are determined under the coordinated frequency regulation control mode; wherein, the unit frequency regulation instructions include the frequency regulation instructions of each frequency regulation mode participating in the primary frequency regulation.

[0053] Based on the aforementioned coordinated frequency regulation control mode, frequency regulation processing is performed using the unit frequency regulation command and the participation timing.

[0054] The frequency regulation deployment strategy includes determining the participation sequence of each cooperative frequency regulation method within a preset initial frequency regulation time based on the capacity of all frequency regulation methods to participate in a single frequency regulation and the actual load adjustment demand. Based on the determined participation sequence, the high-frequency modulation method and the cooperative frequency regulation methods are controlled to perform frequency regulation simultaneously, prioritizing the high-frequency modulation method and ensuring its continuous operation in the early stages. When the frequency regulation time exceeds the preset initial frequency regulation time, the high-frequency modulation method is controlled to exit frequency regulation. The cooperative frequency regulation methods are then prioritized based on the remaining actual load adjustment demand to determine their dynamic deployment order. Following this dynamic deployment order and the principle that the high-frequency modulation method is deployed last, the cooperative frequency regulation method and the high-frequency modulation method are deployed sequentially in the later frequency regulation time for frequency regulation processing until the actual load adjustment demand is met.

[0055] In a second aspect, the present invention provides a primary frequency regulation control system for thermal power units, the system comprising:

[0056] The frequency regulation judgment module is used to collect the unit frequency of the thermal power unit in real time at each collection time, and to judge the primary frequency regulation action status and unit load adjustment mode based on the unit frequency at adjacent collection times and the preset primary frequency regulation dead zone.

[0057] The frequency regulation determination module is used to obtain the primary frequency regulation start time and the primary frequency regulation reference load value based on the primary frequency regulation operation status.

[0058] The load regulation module is used to obtain the corresponding theoretical load adjustment demand of the thermal power unit based on the frequency difference between the unit frequency and the primary frequency regulation dead zone at each moment during the primary frequency regulation process; it is also used to obtain the load adjustment demand correction value at each moment in the unit load regulation mode based on the primary frequency regulation reference load value, the actual unit load of the thermal power unit at each moment during the primary frequency regulation process, and the theoretical load adjustment demand of the unit; the load adjustment demand correction value includes a first load adjustment demand correction value and a second load adjustment demand correction value.

[0059] The coordination control module is used to calculate the actual load adjustment demand of the thermal power unit at each moment during the primary frequency regulation process based on the theoretical load adjustment demand of the unit and the correction value of the load adjustment demand; it is also used to perform primary frequency regulation processing on the thermal power unit according to the actual load adjustment demand at each moment, in a predetermined coordinated frequency regulation control mode and participation sequence.

[0060] Thirdly, the present invention also provides a computer device, including a processor and a memory, the processor being connected to the memory, the memory being used to store a computer program, and the processor being used to execute the computer program stored in the memory, so that the computer device performs the steps of implementing the above-described method.

[0061] Fourthly, the present invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the above-described method.

[0062] This invention provides a primary frequency regulation control method, system, equipment, and storage medium for thermal power units. The method calculates the actual load adjustment demand of the thermal power unit at each moment during the primary frequency regulation process based on the theoretical load adjustment demand and the load adjustment demand correction value. Then, based on the actual load adjustment demand at each moment, the method performs primary frequency regulation processing on the thermal power unit in a predetermined coordinated frequency regulation control mode and participation sequence. Compared with existing technologies, this method uses the theoretical contribution power as the closed-loop control target. It corrects the real-time frequency regulation load adjustment based on the time-averaged difference between the actual and theoretical contribution power during the primary frequency regulation process, ensuring the power contribution index meets the assessment requirements. During the primary frequency regulation process, it calculates the maximum output adjustment in real time and corrects the real-time frequency regulation load adjustment demand based on this adjustment, ensuring the output response index meets the assessment requirements. Furthermore, it adopts the principle of prioritizing high-frequency gate frequency regulation in the early stages and last in the later stages, leveraging the fast response speed of high-frequency gate frequency regulation. By employing high-frequency gate and other frequency regulation methods in the early stages of primary frequency regulation, it ensures rapid response, meets response delay requirements, improves the timeliness and accuracy of the unit's primary frequency regulation assessment, and enhances the primary frequency regulation control effect. Attached Figure Description

[0063] Figure 1 This is a schematic flowchart of the primary frequency regulation control method for thermal power units provided in an embodiment of the present invention;

[0064] Figure 2 This is a schematic diagram of the primary frequency regulation control process of a thermal power unit provided in an embodiment of the present invention;

[0065] Figure 3 This is a block diagram of the primary frequency regulation control system for thermal power units provided in an embodiment of the present invention;

[0066] Figure 4 This is a schematic diagram of the structure of a computer device provided in an embodiment of the present invention. Detailed Implementation

[0067] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. The embodiments are given for illustrative purposes only and should not be construed as limiting the present invention. The accompanying drawings are for reference and illustration only and do not constitute a limitation on the scope of patent protection of the present invention, because many changes can be made to the present invention without departing from the spirit and scope of the present invention.

[0068] refer to Figure 1 This invention provides a primary frequency regulation control method for thermal power units, such as... Figure 1 As shown, the method includes the following steps:

[0069] S1. Real-time acquisition of the unit frequency of thermal power units at each acquisition time, and determination of the primary frequency regulation action status and unit load adjustment mode based on the unit frequency at adjacent acquisition times and the preset primary frequency regulation dead zone.

[0070] like Figure 2 As shown, in this embodiment, the step of determining the primary frequency regulation operation status and unit load adjustment mode based on the unit frequency at adjacent acquisition times and the preset primary frequency regulation dead zone includes:

[0071] The system determines whether the unit frequency acquired at the current acquisition time exceeds the preset primary frequency regulation dead zone. If the unit frequency acquired at the current acquisition time does not exceed the primary frequency regulation dead zone, the system continues to acquire the unit frequency of the thermal power unit at the next acquisition time and determines whether the unit frequency acquired at the next acquisition time exceeds the preset primary frequency regulation dead zone. In this embodiment, the primary frequency regulation dead zone of the thermal power unit is generally taken as 50±1 / 30Hz (3000±2r / min), which is approximately 50±0.033Hz. Among them, 50Hz is the rated frequency of the thermal power unit.

[0072] If the unit frequency collected at the current acquisition time exceeds the primary frequency regulation dead zone, it is determined whether the unit frequency collected at the previous acquisition time exceeds the preset primary frequency regulation dead zone. If it is determined that the unit frequency collected at the previous acquisition time is within the primary frequency regulation dead zone, it indicates that a new primary frequency regulation process has begun. At this time, the primary frequency regulation action status is determined to be the new primary frequency regulation action start state, and the current acquisition time is taken as the primary frequency regulation start time for the thermal power unit to enter the new primary frequency regulation action, and the primary frequency regulation reference load value is determined. If it is determined that the unit frequency collected at the previous acquisition time is outside the primary frequency regulation dead zone, it indicates that the thermal power unit is still in the current primary frequency regulation process. At this time, the primary frequency regulation action status is determined to be the previous frequency regulation action operation state, and the stored primary frequency regulation start time and primary frequency regulation reference load value of the thermal power unit entering the previous frequency regulation action are retrieved for subsequent frequency regulation calculation and processing.

[0073] For unit load regulation modes, this embodiment classifies unit load regulation modes into the following two categories based on the frequency deviation between the unit frequency and the primary frequency regulation dead zone:

[0074] If the unit frequency collected at the current acquisition time is less than the lower limit of the primary frequency regulation dead zone, then the unit frequency is too low. It is necessary to increase the unit load and output to restore the frequency to the dead zone range. In this case, the theoretical load adjustment demand ΔP... E If (t) is greater than zero, the unit load regulation mode is determined to be the unit frequency regulation and load increase mode;

[0075] If the unit frequency collected at the current acquisition time is greater than the upper limit of the primary frequency regulation dead zone, then the unit frequency is too high. It is necessary to reduce the unit load and output to restore the frequency to within the dead zone range. In this case, the theoretical load adjustment demand ΔP... E If (t) is less than zero, the unit load regulation mode is determined to be the unit frequency regulation and load reduction mode.

[0076] S2. Based on the primary frequency regulation operation status, obtain the primary frequency regulation start time and the primary frequency regulation reference load value.

[0077] Specifically, when it is determined that a new frequency modulation process has begun, assuming from t A At the start of the acquisition, the acquired unit frequency exceeds the primary frequency modulation dead zone. At this point, based on the current acquisition time t... A The primary frequency regulation start-up moment marks the beginning of a new frequency regulation operation for thermal power units, and continues until t. B When the generator frequency returns to the dead zone range, it indicates the end of primary frequency regulation. In this embodiment, the primary frequency regulation reference load value is obtained using any one of the following three methods. Those skilled in the art can determine the method based on the specific implementation. The methods for obtaining the primary frequency regulation reference load value are as follows:

[0078] 1) Taking the first frequency modulation start time t A The unit load is used as the primary frequency regulation reference load value;

[0079] 2) Taking the first frequency modulation start time t A Previously preset reference time T d The average unit load within the time frame is used as the primary frequency regulation reference load value; wherein, the preset reference time T d Preferably set it to 5 seconds or 10 seconds;

[0080] 3) Taking the first frequency modulation start time t A Previously preset reference time T d The maximum value of the unit load in the frequency regulation load increase mode or the minimum value in the frequency regulation load decrease mode is taken as the primary frequency regulation reference load value, specifically:

[0081] If the unit frequency collected at the start of the primary frequency regulation exceeds the upper limit of the primary frequency regulation dead zone, it is necessary to reduce the unit load and select the thermal power unit at t A Preset reference time T before the time. d The minimum unit load within the range is used as the primary frequency regulation reference load value; if the unit frequency collected at the start of the primary frequency regulation is lower than the lower limit of the primary frequency regulation dead zone, the unit load needs to be increased, and the thermal power unit t is selected. A Preset reference time T before the time. d The maximum unit load within the range is used as the primary frequency regulation reference load value.

[0082] If it is determined that the thermal power unit is still in the previous primary frequency regulation process, the stored primary frequency regulation start time and primary frequency regulation reference load value of the thermal power unit entering the previous frequency regulation process are retrieved and used for subsequent frequency regulation calculation and processing.

[0083] S3. Based on the frequency difference between the unit frequency and the primary frequency regulation dead zone at various times during the primary frequency regulation process, the corresponding theoretical load adjustment demand of the unit is obtained, wherein the calculation formula for the theoretical load adjustment demand of the unit is:

[0084]

[0085] in,

[0086] |ΔP E (t)|≤K P ×P N

[0087] In the formula, ΔP E (t) represents the theoretical load adjustment demand of the thermal power unit at time t during the primary frequency regulation process; Δf(t) represents the frequency difference between the unit frequency at time t and the primary frequency regulation dead zone during the primary frequency regulation process; P N Indicates the rated power of the thermal power unit; f n This indicates the rated frequency of the thermal power unit, which is 50Hz; δ represents the speed variability rate; K P This indicates the maximum output limit of a thermal power unit, which is the percentage of the maximum frequency regulation load change range that a thermal power unit can participate in primary frequency regulation to the rated power of the unit.

[0088] It should be noted that, for thermal power units, the formula for calculating the frequency difference Δf(t) between the unit frequency at time t and the primary frequency regulation dead zone during frequency regulation is as follows:

[0089] When the unit frequency at time t during a primary frequency regulation process exceeds the upper limit of the primary frequency regulation dead zone, i.e., f(t) - f n When ≥0.033Hz, Δf(t)=f(t)-f n -0.033;

[0090] When the unit frequency of a thermal power unit at time t is lower than the lower limit of the primary frequency regulation dead zone during the primary frequency regulation process, i.e., f(t) - f n When ≤-0.033Hz, Δf(t)=f(t)-f n -0.033.

[0091] S4. In the unit load regulation mode, based on the primary frequency regulation reference load value, the actual unit load of the thermal power unit at each moment during the primary frequency regulation process, and the theoretical load adjustment demand of the unit, the load adjustment demand correction value at each moment is obtained; the load adjustment demand correction value includes a first load adjustment demand correction value and a second load adjustment demand correction value.

[0092] In one embodiment, the step of obtaining the first load adjustment demand correction value specifically includes:

[0093] Based on the actual unit load and the primary frequency regulation reference load value at each moment during the primary frequency regulation process, the actual maximum output adjustment of the thermal power unit from the start of the primary frequency regulation to the present is obtained. The calculation formula for the actual maximum output adjustment is as follows:

[0094]

[0095] In the formula, ΔP S,max (t) represents the actual maximum output adjustment of the thermal power unit from the start of the primary frequency regulation to time t; P S (t) represents the actual unit load of the thermal power unit at time t during the primary frequency regulation process; P0 represents the primary frequency regulation reference load value; t A Indicates the start time of a frequency modulation;

[0096] Based on the theoretical load adjustment demand of the unit, the theoretical maximum output adjustment from the start of the primary frequency regulation to the present is obtained, wherein the calculation formula for the theoretical maximum output adjustment is:

[0097]

[0098] In the formula, ΔP E,max (t) represents the thermal power unit from the start time t of primary frequency regulation. A The theoretical maximum output adjustment at time t; ΔP E (t) represents the theoretical load adjustment demand of the thermal power unit at time t during the primary frequency regulation process;

[0099] In the unit load regulation mode, the first load regulation demand correction value is obtained based on the actual maximum output adjustment amount, the theoretical maximum output adjustment amount, and the preset first correction coefficient.

[0100] In this embodiment, when the actual maximum output adjustment amount does not reach the theoretical maximum output adjustment amount, the load adjustment demand needs to be increased to increase the frequency regulation output; conversely, if the frequency regulation output meets the frequency regulation requirements, no correction is made to the load adjustment demand. The maximum frequency deviation during the frequency regulation process generally occurs in the early stage of the frequency regulation process. Through the feedback of the first load adjustment demand correction amount, it can be ensured in a timely manner that the output response index meets the assessment requirements. Specifically, when the frequency regulation process is in the unit's frequency regulation and load increase mode, the calculation formula for the first load adjustment demand correction value is as follows:

[0101] ΔP1(t)=max(K1×(ΔP E,max (t)-ΔP S,max (t)),0)

[0102] When the frequency regulation process is in the unit's frequency regulation and load reduction mode, the calculation formula for the correction value of the first load adjustment demand is:

[0103] ΔP1(t)=min(K1×(ΔP E,max (t)-ΔP S,max (t)),0)

[0104] In the formula, ΔP1(t) represents the correction value of the first load adjustment demand; K1 represents the preset first correction coefficient. In this embodiment, the first correction coefficient is preferably set to 1, which means that the correction is made with the goal of achieving 100% output response index. Those skilled in the art can adjust it according to the frequency regulation characteristics of the unit, and it is not limited to the embodiment of the present invention.

[0105] It should be noted that existing technologies use the output response index as an indicator to evaluate the primary frequency regulation performance of thermal power units. The output response index is defined as ΔP. S,max (t) and ΔP E,max The ratio, where ΔP E,max The calculation formula is:

[0106]

[0107] In the formula, ΔP E,max This indicates the time from the start of the first frequency modulation, t A until the end of one frequency modulation time t B The theoretical maximum output adjustment amount, for example, the 15-second output response index represents the change from t... A Starting from a certain point, the ratio of the actual maximum output adjustment of the unit within 15 seconds to the theoretical maximum output adjustment during the frequency regulation duration is used in existing technologies to calculate ΔP. S,max (t) and ΔP E,max The output response index (ΔP) is used as an indicator to evaluate the primary frequency regulation performance of thermal power units; however, it is impossible to calculate ΔP before the primary frequency regulation is completed. E,maxThis means that the index can only be calculated after frequency modulation has ended, which may result in one or more of the assessment indicators failing to meet the assessment requirements after frequency modulation is completed. Therefore, in order to ensure that the output response index meets the assessment requirements, this embodiment uses ΔP... S,max (t) and ΔP E,max The difference between (t) and load adjustment demand is corrected in real time. This not only ensures the timeliness of the calculation of the assessment indicators and facilitates the timely analysis of causes by the operators, but also ensures the reliability of the primary frequency regulation assessment measurement.

[0108] In one embodiment, the step of obtaining the second load adjustment demand correction value specifically involves:

[0109] Based on the thermal power unit's frequency regulation process from the start time t during the primary frequency regulation process... A The actual power contribution of the thermal power unit is calculated based on the current actual unit load and the primary frequency regulation reference load value; wherein, the formula for calculating the actual power contribution is:

[0110]

[0111] In the formula, ΔQ S (t) represents the thermal power unit from the start time t of primary frequency regulation. A The actual electricity contribution at time t; P S (t) represents the actual unit load of the thermal power unit at time t during the primary frequency regulation process; P0 represents the primary frequency regulation reference load value;

[0112] Based on the theoretical load adjustment demand of the thermal power unit during the primary frequency regulation process from the start of the regulation to the present, the theoretical contribution power of the thermal power unit is calculated; wherein, the formula for calculating the theoretical contribution power is:

[0113]

[0114] In the formula, ΔQ E (t) represents the thermal power unit from the start time t of primary frequency regulation. A The theoretical contribution of electricity up to time t; ΔP E (t) represents the theoretical load adjustment demand of the thermal power unit at time t during the primary frequency regulation process;

[0115] In the unit load regulation mode, the second load adjustment demand correction value is obtained based on the actual contributed power, the theoretical contributed power, the frequency regulation duration, and the preset second correction coefficient.

[0116] In this embodiment, under the unit frequency regulation and load increase mode, the calculation formula for the second load adjustment demand correction value is as follows:

[0117] ΔP2(t)=max(K2×(ΔQ E (t)-ΔQ S (t)) / ΔT,0)

[0118] Under the unit frequency regulation and load reduction mode, the calculation formula for the correction value of the second load adjustment demand is as follows:

[0119] ΔP2(t)=min(K2×(ΔQ E (t)-ΔQ S (t)) / ΔT,0)

[0120] In the formula, ΔP2(t) represents the correction value of the second load adjustment demand; ΔT represents the duration of the first frequency regulation process, that is, the current time minus the start time of the first frequency regulation; K2 represents the preset second correction coefficient. In this embodiment, the second correction coefficient is preferably set to 1, which means that the correction is made with the goal of achieving 100% power contribution index. Those skilled in the art can adjust it according to the frequency regulation characteristics of the unit, and it is not limited to the embodiment of the present invention.

[0121] This embodiment uses the time-averaged difference between the theoretical and actual power contribution during the primary frequency regulation process as feedback to calculate the correction value for the second load adjustment demand. When the actual power contribution does not reach the theoretical power contribution, the load adjustment demand needs to be increased to increase the frequency regulation output; conversely, if the frequency regulation output meets the frequency regulation requirements, no correction is made to the load adjustment demand. This embodiment uses the time-averaged difference between the theoretical and actual power contribution during the primary frequency regulation process to provide real-time feedback correction to the load adjustment demand, effectively ensuring that the power contribution during the primary frequency regulation process meets the assessment requirements, improving the primary frequency regulation qualification rate, and reducing power plant assessment costs.

[0122] S5. Based on the theoretical load adjustment demand of the unit and the correction value of the load adjustment demand, calculate the actual load adjustment demand of the thermal power unit at each moment during the primary frequency regulation process, wherein the expression for the actual load adjustment demand is:

[0123] ΔP Em (t)=ΔP E (t)+ΔP1(t)+ΔP2(t)

[0124] In the formula, ΔP Em (t) represents the actual load adjustment demand of the thermal power unit at time t during a primary frequency regulation process.

[0125] S6. Adjust the demand according to the actual load at each time point, and perform primary frequency regulation on the thermal power unit in a predetermined coordinated frequency regulation control mode and participation sequence.

[0126] In one embodiment, the step of adjusting the demand based on the actual load at each time point, and performing primary frequency regulation on the thermal power unit using a predetermined coordinated frequency regulation control mode and participation timing includes:

[0127] All frequency modulation methods that meet the conditions for participating in primary frequency modulation are selected from those other than high-key frequency modulation methods, and these are designated as cooperative frequency modulation methods.

[0128] Determine the cooperative frequency modulation control mode of the cooperative frequency modulation mode and the high-gate frequency modulation mode;

[0129] Based on the actual load adjustment demand and the predetermined frequency regulation input strategy, the unit frequency regulation instructions and participation sequence for each frequency regulation mode during the frequency regulation time are determined under the coordinated frequency regulation control mode; wherein, the unit frequency regulation instructions include the frequency regulation instructions of each regulating valve participating in the primary frequency regulation.

[0130] Based on the aforementioned coordinated frequency regulation control mode, frequency regulation processing is performed using the unit frequency regulation command and the participation timing.

[0131] The frequency regulation deployment strategy includes determining the participation sequence of each cooperative frequency regulation method within a preset initial frequency regulation time based on the participation capacity of all frequency regulation methods in a primary frequency regulation and the actual load adjustment demand. Based on the determined participation sequence, the high-frequency modulation method and the cooperative frequency regulation methods are controlled to perform frequency regulation simultaneously, prioritizing the high-frequency modulation method and ensuring its continuous operation in the early stages. When the frequency regulation time exceeds the preset initial frequency regulation time, the high-frequency modulation method is controlled to exit frequency regulation. The cooperative frequency regulation methods are then prioritized based on the remaining actual load adjustment demand and the participation capacity of all frequency regulation methods in a primary frequency regulation, determining the dynamic deployment order of the cooperative frequency regulation methods. Following this dynamic deployment order and the principle that the high-frequency modulation method is deployed last, the cooperative frequency regulation method and the high-frequency modulation method are deployed sequentially in the later frequency regulation time for frequency regulation processing until the actual load adjustment demand is met.

[0132] The frequency regulation activation strategy adopted in this embodiment can allow high-frequency gate frequency regulation and other frequency regulation methods to operate simultaneously for a period of time after the start of frequency regulation. Subsequently, high-frequency gate frequency regulation is deactivated. Instead of the principle of being activated first, the principle of high-frequency gate frequency regulation being activated last is used to control other frequency regulation methods and high-frequency gate frequency regulation to continue to operate in sequence, which greatly improves the response speed of primary frequency regulation of thermal power units.

[0133] In one embodiment, within a preset pre-amplitude frequency regulation period, this embodiment first calculates the load adjustment demand allocation value for the high-gated frequency regulation mode based on the actual load adjustment demand. Then, based on the remaining actual load adjustment demand and the capacity values ​​of the selected cooperative frequency regulation modes to participate in primary frequency regulation, the participation sequence of each cooperative frequency regulation mode is determined. The load adjustment demand allocation value for all selected cooperative frequency regulation modes is calculated based on the participation sequence. The frequency regulation command for each cooperative frequency regulation mode is obtained based on the load adjustment demand allocation value of each cooperative frequency regulation mode. The load adjustment demand allocation value ΔP for the high-gated frequency regulation mode is... hpv The calculation formula is as follows:

[0134] For the frequency regulation load increase process, i.e., when Δf(t) < 0, ΔP hpv =min(x1·ΔP) Em (t),c1);

[0135] For the frequency regulation and load reduction process, i.e., when Δf(t) > 0, ΔP hpv =max(x1·ΔP) Em (t),c2).

[0136] In the formula, x1 represents a constant between 0 and 1, and in this embodiment, it is preferably taken as 0.5; c1 represents a constant, and it is preferably taken as a value between 1 and 2MW. Those skilled in the art can adjust it according to the rated power of the thermal power unit; c2 is the opposite of c1.

[0137] In this embodiment, the calculation method for the capacity value of other frequency regulation methods participating in primary frequency regulation is as follows: based on the current valve position of the regulating valve, the upper and lower limits of the valve opening, and the valve position-load characteristic relationship, the maximum load increase capacity (value is positive) and the maximum load decrease capacity (value is negative) of the frequency regulation method are calculated.

[0138] It should be noted that high-pressure valve frequency regulation changes the inlet steam flow by adjusting the opening of the high-pressure cylinder inlet steam regulating valve. Increased flow increases the unit's power generation, and vice versa. Compared to other frequency regulation methods, high-pressure valve frequency regulation has a faster response speed and a wider adjustment range. Therefore, traditional primary frequency regulation methods only use high-pressure valve frequency regulation. However, to ensure sufficient frequency regulation capacity for load increase, the high-pressure valve needs to be maintained at a lower valve position, which leads to increased throttling losses and reduced unit efficiency. To reduce these losses, this embodiment uses other frequency regulation methods besides high-pressure valve frequency regulation in conjunction with it. For example, conventional #0 high-pressure heater extraction frequency regulation, #1 high-pressure heater extraction frequency regulation, and other frequency regulation methods can be used to supplement the unit's load increase frequency regulation capacity. For ease of understanding, the following example illustrates the coordinated frequency regulation process of high-pressure valve frequency regulation with #0 high-pressure heater extraction frequency regulation and / or #1 high-pressure heater extraction frequency regulation:

[0139] First, the availability status of each frequency regulation mode determines whether it can participate in a primary frequency regulation. A availability status of True indicates that the frequency regulation mode can participate in a primary frequency regulation; otherwise, it cannot participate. In this embodiment, except in special cases, the availability status of the high-pressure valve frequency regulation mode is always True. Therefore, the availability status of #0 high-pressure heater extraction frequency regulation and #1 high-pressure heater extraction frequency regulation at this time has the following four possibilities:

[0140] (1) Only the #0 high-pressure heater extraction frequency regulation mode is available with the status True:

[0141] When only the #0 high-pressure heater extraction frequency regulation can participate in the primary frequency regulation, since the availability status of the high-pressure valve frequency regulation mode is always True, the coordinated frequency regulation control mode is determined to be the coordinated frequency regulation control mode of the high-pressure valve frequency regulation mode and the #0 high-pressure heater extraction frequency regulation mode. During the preset initial frequency regulation time after the start of frequency regulation, the load adjustment demand allocation value ΔP of the high-pressure valve frequency regulation mode is first calculated. hpv The capacity value P of the #0 high-pressure steam extraction frequency regulation method to participate in primary frequency regulation. h0 (That is, the maximum load increase capacity of the #0 high-pressure steam extraction frequency regulation method), at this time, if the remaining actual load adjustment demand ΔP Em (t)-ΔP hpv The capability value P of the high-pressure steam extraction frequency regulation method not greater than #0 for participating in primary frequency regulation. h0 (That is, the maximum load increase capacity of the #0 high-pressure heater extraction frequency regulation method), then the load adjustment demand allocation value of the #0 high-pressure heater extraction frequency regulation method is the remaining actual load adjustment demand ΔP. Em (t)-ΔP hpv ;

[0142] If the remaining actual load adjustment demand ΔP Em (t)-ΔP hpv The capability value P of the high-pressure heater extraction frequency regulation method to participate in primary frequency regulation is greater than #0. h0 (That is, the maximum load increase capacity of the #0 high-pressure heater extraction frequency regulation method), then the load adjustment demand allocation value of the #0 high-pressure heater extraction frequency regulation method is the maximum load increase capacity value of the #0 high-pressure heater extraction frequency regulation method, and the remaining load adjustment demand ΔP Em (t)-ΔP hpv -P h0 This is achieved by high-frequency modulation.

[0143] After the frequency regulation time exceeds the preset preceding frequency regulation time, the high-pressure valve frequency regulation mode exits the frequency regulation process and is no longer the first frequency regulation mode to be put into operation. Since only the #0 high-pressure heater extraction frequency regulation mode can participate in one frequency regulation process besides the high-pressure valve frequency regulation mode, there is no need to sort the priorities at this time. Following the principle that the high-pressure valve frequency regulation mode is put into operation last, the #0 high-pressure heater extraction frequency regulation mode and the high-pressure valve frequency regulation mode are put into operation in sequence for subsequent frequency regulation processing. That is, after the frequency regulation time exceeds the preset preceding frequency regulation time, the load adjustment demand is first met by the #0 high-pressure heater extraction frequency regulation mode. If it cannot be met, the high-pressure valve frequency regulation mode is finally used to meet the demand.

[0144] (2) Only the #1 high-pressure heater extraction frequency regulation mode is available when the state is True. At this time, the coordinated frequency regulation process is similar to (1) above, and will not be repeated here.

[0145] (3) The available status of both the #0 high-pressure heater extraction frequency regulation mode and the #1 high-pressure heater extraction frequency regulation mode is True:

[0146] During the preset initial frequency regulation period after the start of frequency regulation, the coordinated frequency regulation process of the #0 high-pressure heater extraction frequency regulation mode, the #1 high-pressure heater extraction frequency regulation mode, and the high-pressure valve frequency regulation mode is similar to the above process. First, the high-pressure valve frequency regulation and the #1 high-pressure heater extraction frequency regulation coordinated frequency regulation mode are put into operation. Then, according to the remaining actual load demand, the #0 high-pressure heater extraction frequency regulation mode and the high-pressure valve frequency regulation mode can be put into operation in sequence. When the frequency regulation time exceeds the preset initial frequency regulation time, the high-pressure valve frequency regulation mode is withdrawn from frequency regulation. It is no longer the frequency regulation mode put into operation first, but the last frequency regulation mode put into operation. At this time, according to the actual load demand, the #1 high-pressure heater extraction frequency regulation mode and the #0 high-pressure heater extraction frequency regulation mode can be put into operation in sequence. Regarding the frequency regulation method and the high-pressure valve frequency regulation method, it should be noted that, considering the impact of steam extraction on system stability, this embodiment prioritizes the #1 high-pressure heater extraction frequency regulation method. If the #1 high-pressure heater extraction frequency regulation still cannot meet the frequency regulation load demand, then the #0 high-pressure heater extraction frequency regulation method is activated. If the #0 high-pressure heater extraction frequency regulation still fails to meet the actual load adjustment demand, the remaining actual load adjustment demand will be met by the high-pressure valve frequency regulation until the actual load adjustment demand is met. In this embodiment, based on the load adjustment demand allocation value of each frequency regulation method and the valve position-load characteristic relationship of each regulating valve, the frequency regulation command for each frequency regulation method is calculated, superimposed on the original valve position command of each regulating valve, and ΔP is... Em (t) is superimposed on the unit load command.

[0147] (4) Neither the #0 high-pressure heater extraction frequency regulation mode nor the #1 high-pressure heater extraction frequency regulation mode can participate in the primary frequency regulation. At this time, only the high-pressure valve frequency regulation mode can participate in the frequency regulation.

[0148] It should be noted that since the #0 high-pressure heater extraction frequency regulation and the #1 high-pressure heater extraction frequency regulation only participate in load increase frequency regulation, when the #0 high-pressure heater extraction frequency regulation, the #1 high-pressure heater extraction frequency regulation, and the high-pressure valve frequency regulation are coordinated, the load reduction frequency regulation is achieved by the high-pressure valve frequency regulation. When other frequency regulation methods that can participate in load reduction frequency regulation are detected, the above-mentioned coordinated frequency regulation process can be applied by simple analogy, and will not be elaborated here.

[0149] Thus far, steps S1 to S6 have completed the process from t A From time t B A complete frequency modulation process ends at time t, and then step S1 begins the frequency determination for the next time step, until t... B At a certain moment, the unit frequency returns to the dead zone range, and then continues to step S1 to determine whether the unit frequency exceeds the primary frequency regulation dead zone, waiting for the start of the next primary frequency regulation process. The interval between the current moment and the next moment is period T, which can generally be 100ms, 200ms, 250ms, etc.

[0150] This invention provides a primary frequency regulation control method for thermal power units. During the initial frequency regulation period after the start of regulation, the method utilizes the fast response speed of high-frequency gate regulation by employing high-frequency gate and other frequency regulation methods simultaneously in primary frequency regulation, thus meeting the response delay requirements. When the frequency regulation time exceeds the initial regulation time, high-frequency gate regulation is discontinued, while other frequency regulation methods continue to operate, ensuring a rapid response to primary frequency regulation of the thermal power unit. Simultaneously, during the frequency regulation process, the real-time frequency regulation load adjustment is corrected based on the difference between the actual maximum output adjustment and the theoretical maximum output adjustment requirement, ensuring that the output response index is met. In addition to meeting the assessment requirements, this embodiment uses the theoretical contribution power as the closed-loop control target. Based on the time average value of the difference between the actual contribution power and the theoretical contribution power calculated in real time during the primary frequency regulation process, the real-time frequency regulation load adjustment demand is corrected. This ensures that the power contribution index meets the assessment requirements, which not only effectively guarantees the reliability of the primary frequency regulation assessment measurement, but also avoids the situation where the assessment indicators can only be obtained after the frequency regulation is completed, which can easily lead to the primary frequency regulation assessment indicators not meeting the requirements. This satisfies the requirements of speed and stability of the unit's primary frequency regulation action and improves the adjustment effect of primary frequency regulation control.

[0151] It should be noted that the sequence number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0152] In one embodiment, such as Figure 3 As shown, this embodiment of the invention provides a primary frequency control system for thermal power units, the system comprising:

[0153] The frequency regulation judgment module 101 is used to collect the unit frequency of the thermal power unit at each collection time in real time, and judge the primary frequency regulation action status and unit load regulation mode based on the unit frequency at adjacent collection times and the preset primary frequency regulation dead zone.

[0154] The frequency regulation determination module 102 is used to obtain the primary frequency regulation start time and the primary frequency regulation reference load value according to the primary frequency regulation operation status.

[0155] The load regulation module 103 is used to obtain the corresponding theoretical load adjustment demand of the thermal power unit based on the frequency difference between the unit frequency and the primary frequency regulation dead zone at each moment during the primary frequency regulation process; it is also used to obtain the load adjustment demand correction value at each moment in the unit load regulation mode based on the primary frequency regulation reference load value, the actual unit load of the thermal power unit at each moment during the primary frequency regulation process, and the theoretical load adjustment demand of the unit; the load adjustment demand correction value includes a first load adjustment demand correction value and a second load adjustment demand correction value.

[0156] The coordination control module 104 is used to calculate the actual load adjustment demand of the thermal power unit at each moment during the primary frequency regulation process based on the theoretical load adjustment demand of the unit and the correction value of the load adjustment demand; it is also used to perform primary frequency regulation processing on the thermal power unit according to the actual load adjustment demand at each moment, in a predetermined coordinated frequency regulation control mode and participation sequence.

[0157] For specific limitations regarding a primary frequency regulation control system for a thermal power unit, please refer to the above-described limitations regarding a primary frequency regulation control method for a thermal power unit, which will not be repeated here. Those skilled in the art will recognize that the various modules and steps described in conjunction with the embodiments disclosed in this application can be implemented in hardware, software, or a combination of both. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0158] This invention provides a primary frequency regulation control system for thermal power units. The system, through a load regulation module and a coordination control module, corrects real-time frequency regulation load adjustment demands and coordinates high-voltage frequency regulation with other frequency regulation methods. Compared to existing technologies, this application improves the pass rate and efficiency of primary frequency regulation assessment and enhances the accuracy of the unit's primary frequency regulation response by conducting online assessment and coordinated control of the primary frequency regulation status of the thermal power unit during the frequency regulation process, while effectively ensuring the safe and stable operation of the system.

[0159] Figure 4This invention provides a computer device including a memory, a processor, and a transceiver, which are connected to each other via a bus. The memory is used to store a set of computer program instructions and data, and can transmit the stored data to the processor. The processor can execute the program instructions stored in the memory to perform the steps of the above method.

[0160] The memory may include volatile memory or non-volatile memory, or both; the processor may be a central processing unit, a microprocessor, an application-specific integrated circuit, a programmable logic device, or a combination thereof. By way of example, but not limitation, the programmable logic device described above may be a complex programmable logic device, a field-programmable gate array, a general-purpose array logic, or any combination thereof.

[0161] In addition, memory can be a physically independent unit or integrated with the processor.

[0162] Those skilled in the art will understand that Figure 4 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have the same component arrangement.

[0163] In one embodiment, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the above-described method.

[0164] In the above embodiments, implementation can be achieved entirely or partially through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented entirely or partially in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present invention are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., SSD), etc.

[0165] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when the computer program is executed, it can include the processes of the embodiments of the above methods.

[0166] The embodiments described above are merely preferred embodiments of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various improvements and substitutions without departing from the technical principles of this invention, and these improvements and substitutions should also be considered within the scope of protection of this application. Therefore, the scope of protection of this patent application should be determined by the scope of the claims.

Claims

1. A primary frequency regulation control method for thermal power units, characterized in that, Includes the following steps: The unit frequency of the thermal power unit is collected in real time at each collection moment, and the primary frequency regulation action status and unit load regulation mode are determined based on the unit frequency at adjacent collection moments and the preset primary frequency regulation dead zone. Based on the primary frequency regulation operation status, obtain the primary frequency regulation start time and the primary frequency regulation reference load value; Based on the frequency difference between the unit frequency at each moment during the primary frequency regulation process and the primary frequency regulation dead zone, the corresponding theoretical load adjustment demand of the unit is obtained. In the unit load regulation mode, the load regulation demand correction value at each moment is obtained based on the primary frequency regulation reference load value, the actual unit load of the thermal power unit at each moment during the primary frequency regulation process, and the theoretical load adjustment demand of the unit. The load adjustment demand correction value includes a first load adjustment demand correction value and a second load adjustment demand correction value; Based on the theoretical load adjustment demand of the unit and the correction value of the load adjustment demand, calculate the actual load adjustment demand of the thermal power unit at each moment during the primary frequency regulation process; The demand is adjusted according to the actual load at each time point, and the thermal power unit is subjected to primary frequency regulation processing in a predetermined coordinated frequency regulation control mode and participation sequence. The specific steps for obtaining the first load adjustment demand correction value are as follows: Based on the actual unit load of the thermal power unit at each moment during the primary frequency regulation process and the primary frequency regulation reference load value, the actual maximum output adjustment of the thermal power unit from the start of the primary frequency regulation to the present is obtained. Based on the theoretical load adjustment demand of the unit, obtain the theoretical maximum output adjustment amount from the start time of the primary frequency regulation to the present. In the unit load regulation mode, the first load regulation demand correction value is obtained based on the actual maximum output adjustment amount, the theoretical maximum output adjustment amount, and the preset first correction coefficient. The specific steps for obtaining the second load adjustment demand correction value are as follows: The actual power contribution of the thermal power unit is calculated based on the actual unit load during the primary frequency regulation process from the start of the primary frequency regulation to the present and the primary frequency regulation reference load value. Calculate the theoretical power contribution of the thermal power unit based on the theoretical load adjustment demand of the unit from the start of the primary frequency regulation to the present during the primary frequency regulation process. In the unit load regulation mode, the second load regulation demand correction value is obtained based on the actual contributed power, the theoretical contributed power, the frequency regulation duration and the preset second correction coefficient. The steps of adjusting the demand based on the actual load at each moment, and performing primary frequency regulation on the thermal power unit using a predetermined coordinated frequency regulation control mode and participation timing, include: All frequency modulation methods that meet the conditions for participating in primary frequency modulation are selected from those other than high-key frequency modulation methods, and these are designated as cooperative frequency modulation methods. Determine the cooperative frequency modulation control mode of the cooperative frequency modulation mode and the high-gate frequency modulation mode; Based on the actual load adjustment demand and the predetermined frequency regulation input strategy, the unit frequency regulation instructions and participation sequence for each frequency regulation mode during the frequency regulation time are determined under the coordinated frequency regulation control mode; wherein, the unit frequency regulation instructions include the frequency regulation instructions of each frequency regulation mode participating in the primary frequency regulation. Based on the aforementioned coordinated frequency regulation control mode, frequency regulation processing is performed using the unit frequency regulation command and the participation timing.

2. The primary frequency control method for thermal power units as described in claim 1, characterized in that, The steps for determining the primary frequency regulation operation status and unit load adjustment mode based on the unit frequency at adjacent acquisition times and the preset primary frequency regulation dead zone include: Determine whether the unit frequency collected at the current acquisition time exceeds the preset primary frequency regulation dead zone. If the unit frequency collected at the current acquisition time does not exceed the primary frequency regulation dead zone, continue to collect the unit frequency of the thermal power unit at the next acquisition time, and determine whether the unit frequency collected at the next acquisition time exceeds the preset primary frequency regulation dead zone. If the unit frequency acquired at the current acquisition time exceeds the primary frequency regulation dead zone, it is determined whether the unit frequency acquired at the previous acquisition time exceeds the preset primary frequency regulation dead zone. If it is determined that the unit frequency acquired at the previous acquisition time is within the primary frequency regulation dead zone, the primary frequency regulation action status is determined to be the new primary frequency regulation action start status, and the current acquisition time is taken as the primary frequency regulation start time for the thermal power unit to enter the new primary frequency regulation action. If it is determined that the unit frequency acquired at the previous acquisition time is outside the primary frequency regulation dead zone, the primary frequency regulation action status is determined to be the previous frequency regulation action running status, and the stored primary frequency regulation start time for the thermal power unit to enter the previous frequency regulation action is retrieved. If the unit frequency collected at the current time is less than the lower limit of the primary frequency regulation dead zone, then the unit load adjustment mode is determined to be the unit frequency regulation load increase mode. If the unit frequency collected at the current time is greater than the upper limit of the primary frequency regulation dead zone, then the unit load adjustment mode is determined to be the unit frequency regulation and load reduction mode.

3. The primary frequency control method for thermal power units as described in claim 1, characterized in that, The method for obtaining the primary frequency regulation reference load value includes any one of the following: using the unit load at the start time of primary frequency regulation as the primary frequency regulation reference load value; using the average unit load within a preset reference time before the start time of primary frequency regulation as the primary frequency regulation reference load value; or using the maximum value of the unit load in the frequency regulation load increase mode or the minimum value in the frequency regulation load decrease mode within a preset reference time before the start time of primary frequency regulation as the primary frequency regulation reference load value.

4. The primary frequency control method for thermal power units as described in claim 1, characterized in that, The formula for calculating the theoretical load adjustment demand of the unit is as follows: in, In the formula, This represents the theoretical load adjustment demand of the thermal power unit at time t during a primary frequency regulation process; This represents the frequency difference between the unit frequency at time t and the dead zone of the primary frequency regulation during the primary frequency regulation process of a thermal power unit. Indicates the rated power of the thermal power unit; Indicates the rated frequency of the thermal power unit; Indicates the rotational speed inequality; This indicates the percentage of the maximum output limit for thermal power units.

5. The primary frequency regulation control method for thermal power units as described in claim 1, characterized in that: Under the unit frequency regulation and load increase mode, the calculation formula for the correction value of the first load adjustment demand is as follows: Under the unit frequency regulation and load reduction mode, the calculation formula for the correction value of the first load adjustment demand is: in, In the formula, This indicates the adjustment value for the first load adjustment demand. This represents the preset first correction factor; Indicates the start time of primary frequency regulation for thermal power units The theoretical maximum output adjustment amount up to time t; Indicates the start time of primary frequency regulation for thermal power units The actual maximum output adjustment amount up to time t; This represents the actual unit load at time t during a primary frequency regulation process; This represents the primary frequency regulation reference load value; This represents the theoretical load adjustment demand of the thermal power unit at time t during a primary frequency regulation process.

6. The primary frequency regulation control method for thermal power units as described in claim 1, characterized in that: Under the unit frequency regulation and load increase mode, the calculation formula for the correction value of the second load adjustment demand is as follows: Under the unit frequency regulation and load reduction mode, the calculation formula for the correction value of the second load adjustment demand is as follows: in, In the formula, This indicates the revised value for the second load adjustment demand. Indicates the duration of a single frequency modulation process; This represents the preset second correction factor; Indicates the start time of primary frequency regulation for thermal power units The theoretical contribution of electricity up to time t; Indicates the start time of primary frequency regulation for thermal power units The actual electricity contribution up to time t; This represents the actual unit load at time t during a primary frequency regulation process; This represents the primary frequency regulation reference load value; This represents the theoretical load adjustment demand of the thermal power unit at time t during a primary frequency regulation process.

7. The primary frequency control method for thermal power units as described in claim 1, characterized in that: The frequency regulation deployment strategy includes determining the participation sequence of each cooperative frequency regulation method within a preset initial frequency regulation time based on the participation capacity of all frequency regulation methods in a single frequency regulation and the actual load adjustment demand. Based on the determined participation sequence, the high-frequency modulation method and the cooperative frequency regulation methods are controlled to perform frequency regulation simultaneously, prioritizing the high-frequency modulation method and ensuring its continuous operation in the early stages. When the frequency regulation time exceeds the preset initial frequency regulation time, the high-frequency modulation method is controlled to exit frequency regulation. The cooperative frequency regulation methods are then prioritized based on the remaining actual load adjustment demand to determine their dynamic deployment order. Following this dynamic deployment order and the principle that the high-frequency modulation method is deployed last, the cooperative frequency regulation method and the high-frequency modulation method are deployed sequentially in the later frequency regulation time for frequency regulation processing until the actual load adjustment demand is met.

8. A primary frequency control system for thermal power units, characterized in that, The system includes: The frequency regulation judgment module is used to collect the unit frequency of the thermal power unit in real time at each collection time, and to judge the primary frequency regulation action status and unit load adjustment mode based on the unit frequency at adjacent collection times and the preset primary frequency regulation dead zone. The frequency regulation determination module is used to obtain the primary frequency regulation start time and the primary frequency regulation reference load value based on the primary frequency regulation operation status. The load regulation module is used to obtain the corresponding theoretical load adjustment demand of the thermal power unit based on the frequency difference between the unit frequency and the primary frequency regulation dead zone at each moment during the primary frequency regulation process; it is also used to obtain the load adjustment demand correction value at each moment in the unit load regulation mode based on the primary frequency regulation reference load value, the actual unit load of the thermal power unit at each moment during the primary frequency regulation process, and the theoretical load adjustment demand of the unit; the load adjustment demand correction value includes a first load adjustment demand correction value and a second load adjustment demand correction value. The coordination control module is used to calculate the actual load adjustment demand of the thermal power unit at each moment during the primary frequency regulation process based on the theoretical load adjustment demand of the unit and the correction value of the load adjustment demand; it is also used to perform primary frequency regulation processing on the thermal power unit according to the actual load adjustment demand at each moment, in a predetermined coordinated frequency regulation control mode and participation sequence. The process of obtaining the first load adjustment demand correction value is as follows: Based on the actual unit load of the thermal power unit at each moment during the primary frequency regulation process and the primary frequency regulation reference load value, the actual maximum output adjustment of the thermal power unit from the start of the primary frequency regulation to the present is obtained. Based on the theoretical load adjustment demand of the unit, obtain the theoretical maximum output adjustment amount from the start time of the primary frequency regulation to the present. In the unit load regulation mode, the first load regulation demand correction value is obtained based on the actual maximum output adjustment amount, the theoretical maximum output adjustment amount, and the preset first correction coefficient. The process of obtaining the second load adjustment demand correction value is as follows: The actual power contribution of the thermal power unit is calculated based on the actual unit load during the primary frequency regulation process from the start of the primary frequency regulation to the present and the primary frequency regulation reference load value. Calculate the theoretical power contribution of the thermal power unit based on the theoretical load adjustment demand of the unit from the start of the primary frequency regulation to the present during the primary frequency regulation process. In the unit load regulation mode, the second load regulation demand correction value is obtained based on the actual contributed power, the theoretical contributed power, the frequency regulation duration and the preset second correction coefficient. The process of adjusting demand based on actual load at various times, and performing primary frequency regulation on thermal power units using a predetermined coordinated frequency regulation control mode and participation sequence, specifically includes: All frequency modulation methods that meet the conditions for participating in primary frequency modulation are selected from those other than high-key frequency modulation methods, and these are designated as cooperative frequency modulation methods. Determine the cooperative frequency modulation control mode of the cooperative frequency modulation mode and the high-gate frequency modulation mode; Based on the actual load adjustment demand and the predetermined frequency regulation input strategy, the unit frequency regulation instructions and participation sequence for each frequency regulation mode during the frequency regulation time are determined under the coordinated frequency regulation control mode; wherein, the unit frequency regulation instructions include the frequency regulation instructions of each frequency regulation mode participating in the primary frequency regulation. Based on the aforementioned coordinated frequency regulation control mode, frequency regulation processing is performed using the unit frequency regulation command and the participation timing.

9. A computer device, characterized in that: The device includes a processor and a memory, the processor being connected to the memory for storing computer programs, and the processor for executing the computer programs stored in the memory to cause the computer device to perform the method as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program that, when executed, implements the method as described in any one of claims 1 to 7.

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