Control method and device for primary frequency regulation parameters of unit

Abstract

The embodiment of the present application provides a method and device for controlling the primary frequency regulation parameters of a unit, the method comprising: in response to receiving a primary frequency regulation request of the unit, obtaining a power output regulation value according to a turbine speed difference and an unequal rate function; determining a valve opening adjustment amount according to the turbine speed difference and a feedforward function, and determining a comprehensive valve position instruction according to the valve opening adjustment amount and the power output regulation value to control the turbine regulating valve; in response to controlling the turbine to a preset time, compensating the power target value and the comprehensive valve position instruction according to the difference between a pre-calculated frequency regulation theoretical load change amount and a current frequency regulation actual load change amount, so that the difference between the frequency regulation theoretical load change amount and the frequency regulation actual load change amount meets the preset requirements; the present application can optimize the primary frequency regulation performance of the unit, ensure that the frequency regulation response is rapid and accurate, and enhance the stability of the power grid frequency, thereby improving the overall safety of the power system.

Description

Technical Field

[0001] The present application relates to the field of power grid control, and in particular to a method and device for controlling primary frequency regulation parameters of a unit. Background Art

[0002] In the power system, frequency is one of the key indicators to measure the quality of power. The frequency of the power system must be maintained within an allowable range to ensure the safety and economic benefits of the entire system. If the frequency exceeds this range, it will not only affect the power system itself, but may also have adverse consequences for the generator set and end users. In particular, when the frequency fluctuates for a long time and by a large margin, it may have a serious impact on the power grid, and even lead to the decoupling of the power grid in extreme cases. In order to meet these challenges, improving the primary frequency regulation performance of the unit becomes the key.

[0003] At present, power plants usually use a method that combines DEH (digital electro-hydraulic control system) feedforward control and CCS (coordinated control system) simultaneous control to perform primary frequency modulation. When the system detects that a primary frequency modulation is required, the CCS side first calculates the required power change value through the unequal rate function, adds it to the original power setting value, and then compares it with the actual power and adjusts it through the PI controller. In this process, the DEH side calculates the corresponding valve opening adjustment amount according to the feedforward function and superimposes it on the valve position instruction to achieve control of the turbine regulating valve.

[0004] However, once the unequal rate function on the CCS side and the feedforward function on the DEH side are determined, they will not be automatically adjusted according to the actual control effect of the primary frequency regulation during actual operation. The above fixed control strategy will lead to a decrease in the operating efficiency of the unit and affect the frequency stability of the power grid.

[0005] On the other hand, in order to improve the primary frequency regulation performance of the whole network units and ensure the safe and stable operation of the power grid, the relevant management departments have issued new standards for the adjustment of the primary frequency regulation performance assessment indicators of the units. To this end, it is necessary to optimize the existing primary frequency regulation technical solutions of thermal power units to improve their primary frequency regulation performance. On the one hand, the primary frequency regulation performance of thermal power units can meet the updated evaluation standards as much as possible to reduce the amount of assessment; on the other hand, the improvement of the primary frequency regulation performance of thermal power units that can serve as the main frequency regulation will also help enhance the frequency stability of the power grid. Summary of the invention

[0006] In response to the problems in the prior art, the present application provides a method and device for controlling the primary frequency regulation parameters of a unit, which can optimize the primary frequency regulation performance of the unit, ensure rapid and accurate frequency regulation response, enhance the stability of the grid frequency, and improve the overall safety of the power system.

[0007] In order to solve at least one of the above problems, the present application provides the following technical solutions:

[0008] According to a first aspect of an embodiment of the present application, the present application provides a method for controlling a primary frequency modulation parameter of a unit, comprising:

[0009] In response to receiving a frequency modulation request of the unit, determining a required power variation according to a turbine speed difference and a inequality function, and determining a power target value according to the power variation and a preset power setting value;

[0010] Inputting the error value between the power target value and the current actual power into the power controller to obtain a power output adjustment value;

[0011] Determining a valve opening adjustment amount according to the turbine speed difference and the feedforward function, and determining a comprehensive valve position instruction according to the valve opening adjustment amount and the power output adjustment value to control the turbine regulating valve;

[0012] In response to controlling the steam turbine to a preset time, the power target value and the comprehensive valve position instruction are compensated according to the difference between the pre-calculated frequency regulation theoretical load change and the current frequency regulation actual load change, so that the difference between the frequency regulation theoretical load change and the frequency regulation actual load change meets the preset requirements.

[0013] According to any embodiment of the present application, before compensating the power target value and the comprehensive valve position instruction according to the difference between the pre-calculated frequency regulation theoretical load change and the current frequency regulation actual load change, the method further includes:

[0014] Determine the frequency modulation theoretical load change amount according to the turbine speed difference, primary frequency modulation dead zone, rated speed, rated load change amount and primary frequency modulation speed inequality rate;

[0015] The actual load change of the frequency regulation is determined according to the actual power when the steam turbine is controlled to a preset time.

[0016] According to any implementation manner of the present application, compensating the power target value according to the difference between the pre-calculated frequency regulation theoretical load change and the current frequency regulation actual load change includes:

[0017] In response to the frequency regulation theoretical load change being greater than the frequency regulation actual load change, a compensation amount for the power target value is determined according to a difference in the change amounts and a first preset adjustment coefficient, and the power target value is compensated.

[0018] According to any implementation of the present application, compensating the comprehensive valve position instruction according to the difference between the pre-calculated frequency modulation theoretical load change and the current frequency modulation actual load change includes:

[0019] In response to the frequency modulation theoretical load change being greater than the frequency modulation actual load change, the compensation amount of the comprehensive valve position instruction is determined according to the difference in the change amounts and a second preset adjustment coefficient, and the comprehensive valve position is compensated.

[0020] According to any embodiment of the present application, the preset time represents a plurality of times determined according to the preset requirements, different load levels and grid frequency change rates.

[0021] According to a second aspect of an embodiment of the present application, the present application provides a control device for primary frequency modulation parameters of a unit, comprising:

[0022] The target determination module is used to: in response to receiving a primary frequency regulation request of the unit, determine the required power variation according to the turbine speed difference and the inequality function, and determine the power target value according to the power variation and a preset power constant;

[0023] A closed-loop control module is used to: input the error value between the power target value and the current actual power into the power controller to obtain a power output adjustment value;

[0024] A feedforward control module, used to: determine the valve opening adjustment amount according to the turbine speed difference and the feedforward function, and determine the comprehensive valve position instruction according to the valve opening adjustment amount and the power output adjustment value to control the turbine regulating valve;

[0025] The compensation correction module is used to: in response to controlling the steam turbine to a preset time, compensate the power target value and the comprehensive valve position instruction according to the difference between the pre-calculated frequency regulation theoretical load change and the current frequency regulation actual load change, so that the difference between the frequency regulation theoretical load change and the frequency regulation actual load change meets the preset requirements.

[0026] According to any embodiment of the present application, before the compensation correction module compensates the power target value and the comprehensive valve position instruction according to the difference between the pre-calculated frequency modulation theoretical load change and the current frequency modulation actual load change, it also includes:

[0027] Theoretical load calculation module, used to determine the frequency modulation theoretical load change according to the turbine speed difference, primary frequency modulation dead zone, rated speed, rated load change and primary frequency modulation speed inequality;

[0028] The actual load detection module is used to determine the actual load change of the frequency regulation according to the actual power when the steam turbine is controlled to a preset time.

[0029] According to any implementation of the present application, the compensation correction module compensates the power target value according to the difference between the pre-calculated frequency regulation theoretical load change and the current frequency regulation actual load change, specifically for:

[0030] In response to the frequency regulation theoretical load change being greater than the frequency regulation actual load change, a compensation amount for the power target value is determined according to a difference in the change amounts and a first preset adjustment coefficient, and the power target value is compensated.

[0031] According to any embodiment of the present application, the compensation correction module compensates the comprehensive valve position instruction according to the difference between the pre-calculated frequency modulation theoretical load change and the current frequency modulation actual load change, specifically for:

[0032] In response to the frequency modulation theoretical load change being greater than the frequency modulation actual load change, the compensation amount of the comprehensive valve position instruction is determined according to the difference in the change amounts and a second preset adjustment coefficient, and the comprehensive valve position is compensated.

[0033] According to any embodiment of the present application, the preset time represents a plurality of times determined according to the preset requirements, different load levels and grid frequency change rates.

[0034] According to the third aspect of the embodiment of the present application, the present application provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of the method for controlling the primary frequency modulation parameters of the unit are implemented.

[0035] According to a fourth aspect of an embodiment of the present application, the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method for controlling the primary frequency modulation parameters of the unit.

[0036] According to the fifth aspect of the embodiment of the present application, the present application provides a computer program product, including a computer program / instruction, which, when executed by a processor, implements the steps of the method for controlling the primary frequency modulation parameters of the unit.

[0037] As can be seen from the above technical scheme, the present application provides a control method and device for the primary frequency regulation parameters of a unit, which responds to the primary frequency regulation request received from the unit, determines the required power variation according to the turbine speed difference and the inequality function, and determines the power target value according to the power variation and the preset power constant; inputs the error value between the power target value and the current actual power into the power controller to obtain the power output adjustment value; determines the valve opening adjustment according to the turbine speed difference and the feedforward function, and determines the comprehensive valve position instruction according to the valve opening adjustment and the power output adjustment value to control the turbine regulating valve; in response to controlling the turbine to the preset time, compensates the power target value and the comprehensive valve position instruction according to the difference between the pre-calculated frequency regulation theoretical load variation and the current frequency regulation actual load variation, so that the difference between the frequency regulation theoretical load variation and the frequency regulation actual load variation meets the preset requirements. It can optimize the primary frequency regulation performance of the unit, ensure rapid and accurate frequency regulation response, enhance the stability of the power grid frequency, and improve the overall safety of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 It is a schematic diagram of the DEH side feedforward and CCS coordination side simultaneous control method in the embodiment of the present application;

[0040] Figure 2 This is one of the flow charts of the method for controlling the primary frequency modulation parameters of the unit in the embodiment of the present application;

[0041] Figure 3 This is a second flow chart of a method for controlling the primary frequency modulation parameters of a unit in an embodiment of the present application;

[0042] Figure 4 The third flow chart of the method for controlling the primary frequency modulation parameters of the unit in the embodiment of the present application;

[0043] Figure 5 This is one of the structural diagrams of the control device for the primary frequency modulation parameters of the unit in the embodiment of the present application;

[0044] Figure 6 This is the second structural diagram of the control device for the primary frequency modulation parameters of the unit in the embodiment of the present application;

[0045] Figure 7It is a schematic diagram of the structure of an electronic device in an embodiment of the present application. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0047] The acquisition, storage, use, and processing of data in the technical solution of this application comply with the relevant provisions of national laws and regulations.

[0048] In the existing technical solutions, in order to improve the primary frequency regulation performance of thermal power units, power plants usually adopt Figure 1 The DEH side feedforward and CCS (coordination side) are controlled simultaneously as shown. When a frequency modulation is required, the coordination side calculates the required power change according to the unequal rate function and adds it to the original power setting value. Subsequently, the power setting value is compared with the actual power, and the error is adjusted by the PI controller to generate a regulation signal. At the same time, the DEH side calculates the adjustment amount of the valve opening through the feedforward function according to the speed difference, and superimposes the adjustment amount on the comprehensive valve position instruction, and finally controls the regulating valve of the turbine to achieve precise frequency modulation control. The above combined control method aims to improve the response speed and accuracy of the frequency modulation process and ensure stable operation of the unit.

[0049] Taking into account the problem that after the unequal rate function and the DEH-side feedforward function of the existing primary frequency regulation control strategy are determined, they will not be automatically adjusted according to the actual primary frequency regulation control effect, affecting the operating efficiency of the unit and the stability of the grid frequency, the present application provides a control method and device for the primary frequency regulation parameters of the unit, optimizes the primary frequency regulation performance of the unit, ensures that the frequency regulation response is rapid and accurate, enhances the stability of the grid frequency, and improves the overall safety of the power system.

[0050] In order to optimize the primary frequency regulation performance of the unit, ensure rapid and accurate frequency regulation response, enhance the stability of the power grid frequency, and improve the overall safety of the power system, the present application provides an embodiment of a method for controlling the primary frequency regulation parameters of the unit, see Figure 2 The control method of the primary frequency modulation parameters of the unit specifically includes the following contents:

[0051] Step S101: In response to receiving a frequency modulation request of a unit, a required power variation is determined according to a turbine speed difference and a inequality function, and a power target value is determined according to the power variation and a preset power constant.

[0052] When the system receives a frequency regulation request from the unit, it first detects the speed difference of the turbine, which represents the deviation between the current operating speed and the ideal synchronous speed. Based on this deviation and the inequality function, the power change that needs to be adjusted is calculated. The inequality function is a function that determines the magnitude of the frequency regulation response based on the speed difference to ensure that the regulation strength matches the actual needs. The calculated power change is then combined with the preset power setting (i.e., the power setting during normal operation of the unit) to determine a new power target value. The power target value is the goal that the unit should achieve during the frequency regulation process and is used to guide subsequent frequency regulation operations.

[0053] Step S102: inputting the error value between the power target value and the current actual power into the power controller to obtain a power output adjustment value.

[0054] After the power target value is determined, it is compared with the current actual power of the unit to calculate the error between the two. The error represents the degree of deviation between the current actual power and the frequency regulation target. The error value is input into a power controller for processing, such as a PI controller. The PI controller adjusts the error in real time by adjusting the proportional and integral parameters to generate a power output adjustment value. This adjustment value is used to instruct the unit how to adjust its output power in order to gradually reduce the error, so that the actual power approaches the target power, and ensure the stability and accuracy of the frequency regulation process.

[0055] In an exemplary application scenario, when the grid frequency (grid frequency) exceeds the preset dead band range (for example, plus or minus 2r / min), the inequality function starts working. The dead band range is a set frequency interval, and the frequency control will only be triggered when the frequency deviation exceeds this interval. At this time, the inequality function calculates a frequency regulation load instruction based on the inequality formula of the speed. This instruction indicates how much power needs to be adjusted to respond to the frequency deviation. The calculated frequency regulation load instruction will not be executed alone, but will be combined with the original power setting value and superimposed on the power setting value outlet to form the final unit load instruction. This process realizes closed-loop control to ensure the accuracy of frequency regulation, that is, the system can automatically adjust the output power according to the actual frequency changes to maintain frequency stability. Exemplarily, an example of the frequency difference function is shown in Table 1:

[0056]

[0057] Step S103: determining the valve opening adjustment amount according to the turbine speed difference and the feedforward function, and determining the comprehensive valve position instruction according to the valve opening adjustment amount and the power output adjustment value to control the turbine regulating valve.

[0058] The valve opening adjustment amount is determined based on the speed difference of the steam turbine and the feedforward function. The feedforward function is a pre-set control function used to quickly respond to the speed difference and adjust the valve opening in real time, so that the steam turbine can adapt to the frequency modulation requirements more quickly. The determined valve opening adjustment amount is combined with the power output adjustment value previously obtained through the PI controller to form a comprehensive valve position instruction. This instruction is a specific execution command for controlling the steam turbine regulating valve, which is used to adjust the amount of steam entering the steam turbine, thereby changing the output power of the unit and achieving precise frequency modulation control. The above-mentioned control method combining feedforward and feedback ensures that the frequency modulation response is both fast and stable.

[0059] In an exemplary application scenario, when it is detected that the grid frequency exceeds the dead zone range, the feedforward function on the DEH (digital electro-hydraulic control system) side roughly calculates a feedforward value of the turbine flow command based on the historical data between the grid frequency and the integrated valve position. This feedforward value does not rely on feedback, but directly estimates the required adjustment based on a pre-established relationship. This flow command acts directly on the integrated flow execution loop of the turbine to quickly adjust the valve opening, thereby quickly changing the power output of the turbine. The main purpose of the above feedforward control is to ensure the rapidity of the frequency modulation action, so that the system can respond quickly to frequency deviations and reduce frequency modulation delays. Exemplarily, the DEH side feedforward function is shown in Table 2:

[0060]

[0061] Step S104: In response to controlling the steam turbine to a preset time, the power target value and the comprehensive valve position instruction are compensated according to the difference between the pre-calculated frequency regulation theoretical load change and the current frequency regulation actual load change, so that the difference between the frequency regulation theoretical load change and the frequency regulation actual load change meets the preset requirements.

[0062] After the steam turbine is controlled to reach the preset time point, the difference between the theoretical load change of frequency regulation and the current actual load change can be calculated. The theoretical load change of frequency regulation is calculated based on the ideal response preset by the system, while the actual load change is the load change actually achieved by the unit during the frequency regulation process. The difference between the two reflects the degree of deviation between the actual frequency regulation effect and the ideal effect. In order to ensure that the frequency regulation achieves the expected goal, the system will compensate and adjust the previously set power target value and comprehensive valve position instruction according to the difference. Through the above compensation, the system can more accurately adjust the power output and valve opening in the next stage of frequency regulation operation, so that the actual load change is closer to the theoretical target. The above compensation mechanism ensures the accuracy and stability of the frequency regulation response, so that the system can recover to a stable state faster and more effectively when dealing with frequency fluctuations, meeting the high requirements of the power system for frequency regulation performance.

[0063] From the above description, it can be seen that the control method of the primary frequency regulation parameters of the unit provided in the embodiment of the present application can optimize the primary frequency regulation performance of the unit, ensure that the frequency regulation response is fast and accurate, enhance the stability of the grid frequency, and improve the overall safety of the power system.

[0064] In one embodiment of the method for controlling the primary frequency modulation parameters of the unit of the present application, see Figure 3 , before compensating the power target value and the comprehensive valve position instruction according to the difference between the pre-calculated frequency modulation theoretical load change and the current frequency modulation actual load change, it also includes:

[0065] Step S104A: Determine the frequency modulation theoretical load change amount according to the turbine speed difference, the primary frequency modulation dead zone, the rated speed, the rated load change amount and the primary frequency modulation speed inequality rate.

[0066] For example, formula (1) and formula (2) can be used to calculate the power command compensation amount P after a frequency regulation action when the frequency is increased or decreased.

[0067] When frequency regulation increases load, the target power is calculated according to the following formula:

[0068] (1)

[0069] When frequency regulation is used to reduce load, the target power is calculated according to the following formula:

[0070] (2)

[0071] Where:

[0072] △r—turbine speed difference (turbine rated speed - turbine actual speed), r / min;

[0073] r d — primary frequency modulation dead zone, r / min;

[0074] r0—rated speed of turbine, r / min;

[0075] P e —Rated load, MW;

[0076] δ%——the speed inequality rate of primary frequency modulation.

[0077] By combining these parameters, the theoretical load change of frequency regulation can be calculated. This value represents the load adjustment that the system needs to achieve under the current frequency deviation under ideal conditions.

[0078] Step S104B: Determine the actual load change of the frequency regulation according to the actual power when the steam turbine is controlled to a preset time.

[0079] Theoretical calculation can only provide an idealized load change target. In actual operation, various factors often cause the actual results to deviate from theoretical expectations. Therefore, during the frequency modulation operation, it is also necessary to determine the actual load change of the frequency modulation. This value is determined based on the load change actually shown by the system during the frequency modulation process. Specifically, the actual power output of the steam turbine can be recorded at a preset time point. By recording and calculating these actual powers, the system can derive the actual load change of the frequency modulation, thereby understanding the load change achieved by the system in this specific time period during actual operation.

[0080] In one embodiment of the method for controlling the primary frequency regulation parameters of the unit of the present application, the power target value is compensated according to the difference between the pre-calculated frequency regulation theoretical load change and the current frequency regulation actual load change, including:

[0081] In response to the frequency regulation theoretical load change being greater than the frequency regulation actual load change, a compensation amount for the power target value is determined according to a difference in the change amounts and a first preset adjustment coefficient, and the power target value is compensated.

[0082] In this step, the theoretical load change of frequency regulation and the actual load change of frequency regulation are compared. If it is found that the theoretical load change of frequency regulation is greater than the actual load change of frequency regulation, it may indicate that the load adjustment actually achieved by the system is insufficient and fails to fully meet the theoretical expectations. The above-mentioned insufficiency may lead to insufficient frequency regulation response of the system, thereby affecting the stability of the power system.

[0083] To solve this problem, the system calculates a compensation amount based on the difference between the theoretical load change and the actual load change. The size of this compensation amount depends on two factors: first, the difference between the theoretical value and the actual value, that is, the size of the difference; second, the first preset adjustment coefficient, which is pre-set to determine how much the system should adjust when faced with a specific difference. The setting of the adjustment coefficient is usually based on factors such as the system's frequency modulation characteristics, response speed, and required control accuracy.

[0084] Once the compensation amount is calculated, the system will add it to the current power target value to adjust it. Through the above compensation, the system can improve the actual load change to make it closer to the theoretical expectation, thereby achieving more precise control in subsequent frequency regulation operations. The above dynamic compensation mechanism can ensure that the system can respond promptly and accurately when facing frequency fluctuations, ensuring the stability and reliability of the power system.

[0085] In one embodiment of the method for controlling the primary frequency regulation parameters of the unit of the present application, the method of compensating the comprehensive valve position instruction according to the difference between the pre-calculated frequency regulation theoretical load change and the current frequency regulation actual load change includes:

[0086] In response to the frequency modulation theoretical load change being greater than the frequency modulation actual load change, the compensation amount of the comprehensive valve position instruction is determined according to the difference in the change amounts and a second preset adjustment coefficient, and the comprehensive valve position is compensated.

[0087] In this step, compensation is reflected in the adjustment of the comprehensive valve position instruction. First, the compensation amount of the comprehensive valve position instruction is calculated based on the difference between the theoretical and actual load changes, combined with the second preset adjustment coefficient. The compensation amount represents the specific adjustment that needs to be made to the comprehensive valve position instruction, which will directly affect the opening of the turbine regulating valve and achieve more accurate power output control by increasing or decreasing the steam flow. The compensated comprehensive valve position instruction will make the opening adjustment of the turbine valve closer to the theoretical requirements, thereby increasing the actual load change and making it closer to the expected frequency regulation target.

[0088] In an optional embodiment, the preset time represents a plurality of times determined according to the preset requirements, different load levels and grid frequency change rates.

[0089] In order to further illustrate the present scheme, the present application also provides a specific application example of a method for controlling the primary frequency regulation parameters of the unit using the control device for the primary frequency regulation parameters of the unit. Taking the primary frequency regulation index as 75% of the target load change at the 15th second and 90% of the target load change at the 30th second as an example, the present application is designed to reach 60% of the target load change at the 10th second and 85% of the target load change at the 25th second. Figure 4 As shown, the actual primary frequency modulation 10th and 25th second electricity and fixed value calculation are added on the existing basis, and the difference enters the load command loop and comprehensive flow command loop of the original frequency modulation system through compensation controllers 1, 3 and compensation controllers 2, 4 respectively. The specific steps are as follows:

[0090] Step 1: Set the unequal rate function and DEH side feedforward function as shown in Table 1 and Table 2.

[0091] Step 2: When a frequency modulation action occurs, compare the calculated load change at the 10th second and the actual load change at the 10th second, and calculate the difference.

[0092] Step 3: When the theoretical load change is less than the actual load change, the outputs of compensation controller 1 and compensation controller 2 are both 0; when the theoretical load change is greater than the actual load change:

[0093] The output of compensation controller 1 is P1=k1×e1;

[0094] The output of compensation controller 2 is G2=k2×e1;

[0095] Where:

[0096] e1—the difference between the theoretical change and the actual change at the 10th second;

[0097] k1, k2——adjustment coefficients.

[0098] Step 4: Compare the calculated load change at the 25th second and the actual load change at the 25th second, and calculate the difference.

[0099] Step 5: When the theoretical load change is less than the actual load change, the outputs of compensation controller 3 and compensation controller 4 are both 0; when the theoretical load change is greater than the actual load change,

[0100] The output of compensation controller 3 is P3=k3×e2;

[0101] The output of compensation controller 4 is G4=k4×e2;

[0102] Where:

[0103] e2—the difference between the theoretical change and the actual change at the 25th second;

[0104] K3, k4——adjustment coefficients.

[0105] By calculating the load change at the 10th and 25th seconds and performing real-time compensation control, this application improves the response speed and accuracy of the primary frequency modulation. Compared with the traditional method, this application intervenes in advance at the critical time point, allowing the system to achieve the expected load change earlier and avoiding the frequency fluctuation caused by the delayed frequency modulation response. In addition, the introduction of the compensation controller effectively bridges the gap between the actual load change and the theoretical calculation, improves the stability and reliability of the system, and ensures that the grid frequency can recover quickly and remain stable when the load fluctuates.

[0106] In order to optimize the primary frequency regulation performance of the unit, ensure rapid and accurate frequency regulation response, enhance the stability of the power grid frequency, and improve the overall safety of the power system, the present application provides an embodiment of a control device for the primary frequency regulation parameters of the unit for realizing all or part of the content of the control method for the primary frequency regulation parameters of the unit, see Figure 5 The control device of the primary frequency modulation parameters of the unit specifically includes the following contents:

[0107] The target determination module 1101 is used to: in response to receiving a frequency modulation request of the unit, determine the required power variation according to the turbine speed difference and the inequality function, and determine the power target value according to the power variation and a preset power constant value;

[0108] The closed-loop control module 1102 is used to: input the error value between the power target value and the current actual power into the power controller to obtain a power output adjustment value;

[0109] The feedforward control module 1103 is used to: determine the valve opening adjustment amount according to the turbine speed difference and the feedforward function, and determine the comprehensive valve position instruction according to the valve opening adjustment amount and the power output adjustment value to control the turbine regulating valve;

[0110] The compensation correction module 1104 is used to: in response to controlling the steam turbine to a preset time, compensate the power target value and the comprehensive valve position instruction according to the difference between the pre-calculated frequency regulation theoretical load change and the current frequency regulation actual load change, so that the difference between the frequency regulation theoretical load change and the frequency regulation actual load change meets the preset requirements.

[0111] According to any embodiment of the present application, before the compensation correction module compensates the power target value and the comprehensive valve position instruction according to the difference between the pre-calculated frequency modulation theoretical load change amount and the current frequency modulation actual load change amount, refer to Figure 6 , also includes:

[0112] Theoretical load calculation module 1104A is used to determine the frequency modulation theoretical load change according to the turbine speed difference, primary frequency modulation dead zone, rated speed, rated load change and primary frequency modulation speed inequality;

[0113] The actual load detection module 1104B is used to determine the actual load change of the frequency regulation according to the actual power when the steam turbine is controlled to a preset time.

[0114] According to any implementation of the present application, the compensation correction module compensates the power target value according to the difference between the pre-calculated frequency regulation theoretical load change and the current frequency regulation actual load change, specifically for:

[0115] In response to the frequency regulation theoretical load change being greater than the frequency regulation actual load change, a compensation amount for the power target value is determined according to a difference in the change amounts and a first preset adjustment coefficient, and the power target value is compensated.

[0116] According to any embodiment of the present application, the compensation correction module compensates the comprehensive valve position instruction according to the difference between the pre-calculated frequency modulation theoretical load change and the current frequency modulation actual load change, specifically for:

[0117] In response to the frequency modulation theoretical load change being greater than the frequency modulation actual load change, the compensation amount of the comprehensive valve position instruction is determined according to the difference in the change amounts and a second preset adjustment coefficient, and the comprehensive valve position is compensated.

[0118] According to any embodiment of the present application, the preset time represents a plurality of times determined according to the preset requirements, different load levels and grid frequency change rates.

[0119] According to the third aspect of the embodiment of the present application, the present application provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of the method for controlling the primary frequency modulation parameters of the unit are implemented.

[0120] From the above description, it can be seen that the control device for the primary frequency regulation parameters of the unit provided in the embodiment of the present application can optimize the primary frequency regulation performance of the unit, ensure rapid and accurate frequency regulation response, enhance the stability of the grid frequency, and improve the overall safety of the power system.

[0121] From the hardware level, in order to optimize the primary frequency regulation performance of the unit, ensure rapid and accurate frequency regulation response, enhance the stability of the power grid frequency, and improve the overall safety of the power system, the present application provides an embodiment of an electronic device for implementing all or part of the content of the control method of the primary frequency regulation parameters of the unit, and the electronic device specifically includes the following content:

[0122] Processor, memory, communication interface and bus; wherein the processor, memory and communication interface communicate with each other through the bus; the communication interface is used to realize information transmission between the control device of the primary frequency modulation parameters of the unit and related devices such as the core business system, user terminal and related database; the logic controller can be a desktop computer, a tablet computer and a mobile terminal, etc., but the present embodiment is not limited thereto. In the present embodiment, the logic controller can be implemented with reference to the embodiment of the control method of the primary frequency modulation parameters of the unit and the embodiment of the control device of the primary frequency modulation parameters of the unit in the embodiment, and the contents thereof are incorporated herein, and the repeated parts are not repeated.

[0123] It is understandable that the user terminal may include a smart phone, a tablet electronic device, a network set-top box, a portable computer, a desktop computer, a personal digital assistant (PDA), a vehicle-mounted device, a smart wearable device, etc. Among them, the smart wearable device may include smart glasses, a smart watch, a smart bracelet, etc.

[0124] In practical applications, part of the method for controlling the primary frequency modulation parameters of the unit can be executed on the electronic device side as described above, or all operations can be completed in the client device. The specific selection can be based on the processing capability of the client device and the limitations of the user's usage scenario. This application does not limit this. If all operations are completed in the client device, the client device may also include a processor.

[0125] The client device may have a communication module (i.e., a communication unit) that can communicate with a remote server to achieve data transmission with the server. The server may include a server on the task scheduling center side, and other implementation scenarios may also include a server on an intermediate platform, such as a server on a third-party server platform that has a communication link with the task scheduling center server. The server may include a single computer device, or a server cluster consisting of multiple servers, or a server structure of a distributed device.

[0126] Figure 7 FIG. 9 is a schematic block diagram of the system structure of the electronic device 9600 according to an embodiment of the present application. Figure 7 As shown, the electronic device 9600 may include a central processor 9100 and a memory 9140; the memory 9140 is coupled to the central processor 9100. It is worth noting that Figure 7 is exemplary; other types of structures may also be used to supplement or replace this structure to implement telecommunication functions or other functions.

[0127] In one embodiment, the control method function of the primary frequency modulation parameters of the unit can be integrated into the central processor 9100. The central processor 9100 can be configured to perform the following control:

[0128] Step S101: in response to receiving a frequency modulation request of a unit, determining a required power variation according to a turbine speed difference and a inequality function, and determining a power target value according to the power variation and a preset power constant;

[0129] Step S102: inputting the error value between the power target value and the current actual power into the power controller to obtain a power output adjustment value;

[0130] Step S103: determining a valve opening adjustment amount according to the turbine speed difference and the feedforward function, and determining a comprehensive valve position instruction according to the valve opening adjustment amount and the power output adjustment value to control the turbine regulating valve;

[0131] Step S104: In response to controlling the steam turbine to a preset time, the power target value and the comprehensive valve position instruction are compensated according to the difference between the pre-calculated frequency regulation theoretical load change and the current frequency regulation actual load change, so that the difference between the frequency regulation theoretical load change and the frequency regulation actual load change meets the preset requirements.

[0132] From the above description, it can be seen that the electronic device provided in the embodiment of the present application optimizes the primary frequency regulation performance of the unit, ensures rapid and accurate frequency regulation response, enhances the stability of the grid frequency, and improves the overall safety of the power system.

[0133] In another embodiment, the control device of the primary frequency modulation parameters of the unit can be configured separately from the central processing unit 9100. For example, the control device of the primary frequency modulation parameters of the unit can be configured as a chip connected to the central processing unit 9100, and the control method function of the primary frequency modulation parameters of the unit can be implemented through the control of the central processing unit.

[0134] like Figure 7 As shown, the electronic device 9600 may also include: a communication module 9110, an input unit 9120, an audio processor 9130, a display 9160, and a power supply 9170. It is worth noting that the electronic device 9600 does not necessarily have to include Figure 7 In addition, the electronic device 9600 may also include Figure 7 For components not shown, reference may be made to the prior art.

[0135] like Figure 7 As shown, the central processing unit 9100 is sometimes also referred to as a controller or an operation control, and may include a microprocessor or other processor device and / or logic device. The central processing unit 9100 receives input and controls the operation of various components of the electronic device 9600.

[0136] The memory 9140 may be, for example, one or more of a cache, a flash memory, a hard drive, a removable medium, a volatile memory, a non-volatile memory or other suitable devices. The above-mentioned information related to the failure may be stored, and a program for executing the relevant information may also be stored. The CPU 9100 may execute the program stored in the memory 9140 to implement information storage or processing, etc.

[0137] The input unit 9120 provides input to the central processing unit 9100. The input unit 9120 is, for example, a key or a touch input device. The power supply 9170 is used to provide power to the electronic device 9600. The display 9160 is used to display display objects such as images and texts. The display may be, for example, an LCD display, but is not limited thereto.

[0138] The memory 9140 may be a solid-state memory, such as a read-only memory (ROM), a random access memory (RAM), a SIM card, etc. It may also be a memory that saves information even when the power is off, can be selectively erased, and is provided with more data, examples of which are sometimes referred to as EPROMs, etc. The memory 9140 may also be some other type of device. The memory 9140 includes a buffer memory 9141 (sometimes referred to as a buffer). The memory 9140 may include an application / function storage unit 9142, which is used to store application programs and function programs or processes for executing the operation of the electronic device 9600 through the central processor 9100.

[0139] The memory 9140 may also include a data storage unit 9143 for storing data, such as contacts, digital data, pictures, sounds, and / or any other data used by the electronic device. The driver storage unit 9144 of the memory 9140 may include various drivers for communication functions of the electronic device and / or for executing other functions of the electronic device (such as messaging applications, address book applications, etc.).

[0140] The communication module 9110 is a transmitter / receiver 9110 that sends and receives signals via an antenna 9111. The communication module (transmitter / receiver) 9110 is coupled to the central processor 9100 to provide input signals and receive output signals, which may be the same as the case of a conventional mobile communication terminal.

[0141] Based on different communication technologies, multiple communication modules 9110 may be provided in the same electronic device, such as a cellular network module, a Bluetooth module and / or a wireless LAN module, etc. The communication module (transmitter / receiver) 9110 is also coupled to a speaker 9131 and a microphone 9132 via an audio processor 9130 to provide an audio output via the speaker 9131 and receive an audio input from the microphone 9132, thereby realizing a common telecommunication function. The audio processor 9130 may include any suitable buffer, decoder, amplifier, etc. In addition, the audio processor 9130 is also coupled to the central processor 9100, so that recording can be performed on the local machine through the microphone 9132, and the sound stored on the local machine can be played through the speaker 9131.

[0142] The embodiment of the present application also provides a computer-readable storage medium capable of implementing all steps of the method for controlling the primary frequency modulation parameters of a unit in the above embodiment, where the execution subject is a server or a client. The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, all steps of the method for controlling the primary frequency modulation parameters of a unit in the above embodiment are implemented. For example, when the processor executes the computer program, the following steps are implemented:

[0143] Step S101: in response to receiving a frequency modulation request of a unit, determining a required power variation according to a turbine speed difference and a inequality function, and determining a power target value according to the power variation and a preset power constant;

[0144] Step S102: inputting the error value between the power target value and the current actual power into the power controller to obtain a power output adjustment value;

[0145] Step S103: determining a valve opening adjustment amount according to the turbine speed difference and the feedforward function, and determining a comprehensive valve position instruction according to the valve opening adjustment amount and the power output adjustment value to control the turbine regulating valve;

[0146] Step S104: In response to controlling the steam turbine to a preset time, the power target value and the comprehensive valve position instruction are compensated according to the difference between the pre-calculated frequency regulation theoretical load change and the current frequency regulation actual load change, so that the difference between the frequency regulation theoretical load change and the frequency regulation actual load change meets the preset requirements.

[0147] From the above description, it can be seen that the computer-readable storage medium provided in the embodiment of the present application optimizes the primary frequency regulation performance of the unit, ensures rapid and accurate frequency regulation response, enhances the stability of the grid frequency, and improves the overall safety of the power system.

[0148] The embodiments of the present application also provide a computer program product capable of implementing all steps of the method for controlling the primary frequency modulation parameters of a unit in the above-mentioned embodiment, where the execution subject is a server or a client. When the computer program / instruction is executed by a processor, the steps of the method for controlling the primary frequency modulation parameters of the unit are implemented. For example, the computer program / instruction implements the following steps:

[0149] Step S101: in response to receiving a frequency modulation request of a unit, determining a required power variation according to a turbine speed difference and a inequality function, and determining a power target value according to the power variation and a preset power constant;

[0150] Step S102: inputting the error value between the power target value and the current actual power into the power controller to obtain a power output adjustment value;

[0151] Step S103: determining a valve opening adjustment amount according to the turbine speed difference and the feedforward function, and determining a comprehensive valve position instruction according to the valve opening adjustment amount and the power output adjustment value to control the turbine regulating valve;

[0152] Step S104: In response to controlling the steam turbine to a preset time, the power target value and the comprehensive valve position instruction are compensated according to the difference between the pre-calculated frequency regulation theoretical load change and the current frequency regulation actual load change, so that the difference between the frequency regulation theoretical load change and the frequency regulation actual load change meets the preset requirements.

[0153] From the above description, it can be seen that the computer program product provided in the embodiment of the present application optimizes the primary frequency regulation performance of the unit, ensures rapid and accurate frequency regulation response, enhances the stability of the grid frequency, and improves the overall safety of the power system.

[0154] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, devices, or computer program products. Therefore, the present application may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0155] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (apparatus), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of the processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0156] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0157] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0158] Specific embodiments are used in this application to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core idea of ​​this application. At the same time, for those skilled in the art, according to the idea of ​​this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on this application.

Claims

1. A method for controlling primary frequency modulation parameters of a unit, characterized in that: The method comprises: In response to receiving a frequency modulation request of the unit, determining a required power variation according to a turbine speed difference and a inequality function, and determining a power target value according to the power variation and a preset power setting value; Inputting the error value between the power target value and the current actual power into the power controller to obtain a power output adjustment value; Determining a valve opening adjustment amount according to the turbine speed difference and the feedforward function, and determining a comprehensive valve position instruction according to the valve opening adjustment amount and the power output adjustment value to control the turbine regulating valve; In response to controlling the steam turbine to a preset time, the power target value and the comprehensive valve position instruction are compensated according to the difference between the pre-calculated frequency modulation theoretical load change and the current frequency modulation actual load change, so that the difference between the frequency modulation theoretical load change and the frequency modulation actual load change meets the preset requirement, wherein, when a frequency modulation action occurs: Compare the calculated load change at the 10th second with the actual load change at the 10th second, and calculate the difference; When the theoretical load change is less than the actual load change, the outputs of the control compensation controller 1 and the compensation controller 2 are 0. When the theoretical load change is greater than the actual load change, the output of the control compensation controller 1 is P1=k1×e1, and the output of the compensation controller 2 is G2=k2×e1. Where: e1 is the difference between the theoretical change and the actual change at the 10th second, k1 and k2 are adjustment coefficients; Compare the calculated load change at the 25th second with the actual load change at the 25th second, and calculate the difference; When the theoretical load change is less than the actual load change, the outputs of the control compensation controller 3 and the compensation controller 4 are controlled to be 0. When the theoretical load change is greater than the actual load change, the output of the control compensation controller 3 is P3=k3×e2; the output of the compensation controller 4 is G4=k4×e2. Where: e2 is the difference between the theoretical change and the actual change at the 25th second, K3 and k4 are adjustment coefficients; The compensation controller 1 and the compensation controller 3 are used to compensate the power target value, and the compensation controller 2 and the compensation controller 4 are used to compensate the comprehensive valve position instruction.

2. The method for controlling the primary frequency modulation parameters of a unit according to claim 1, characterized in that: Before compensating the power target value and the comprehensive valve position instruction according to the difference between the pre-calculated frequency modulation theoretical load change and the current frequency modulation actual load change, the method further includes: Determine the frequency modulation theoretical load change amount according to the turbine speed difference, primary frequency modulation dead zone, rated speed, rated load change amount and primary frequency modulation speed inequality rate; The actual load change of the frequency regulation is determined according to the actual power when the steam turbine is controlled to a preset time.

3. The method for controlling the primary frequency modulation parameters of a unit according to claim 1, characterized in that: The compensating the power target value according to the difference between the pre-calculated frequency regulation theoretical load change and the current frequency regulation actual load change includes: In response to the frequency regulation theoretical load change being greater than the frequency regulation actual load change, a compensation amount for the power target value is determined according to a difference in the change amounts and a first preset adjustment coefficient, and the power target value is compensated.

4. The method for controlling the primary frequency modulation parameters of a unit according to claim 1, characterized in that: The method of compensating the comprehensive valve position instruction according to the difference between the pre-calculated frequency modulation theoretical load change and the current frequency modulation actual load change includes: In response to the frequency modulation theoretical load change being greater than the frequency modulation actual load change, the compensation amount of the comprehensive valve position instruction is determined according to the difference in the change amounts and a second preset adjustment coefficient, and the comprehensive valve position is compensated.

5. The method for controlling the primary frequency modulation parameters of a unit according to claim 1, characterized in that: The preset time represents a plurality of times determined according to the preset requirements, different load levels and grid frequency change rates.

6. A control device for primary frequency modulation parameters of a unit, characterized in that: The device comprises: The target determination module is used to: in response to receiving a primary frequency regulation request of the unit, determine the required power variation according to the turbine speed difference and the inequality function, and determine the power target value according to the power variation and a preset power constant; A closed-loop control module is used to: input the error value between the power target value and the current actual power into the power controller to obtain a power output adjustment value; A feedforward control module, used to: determine the valve opening adjustment amount according to the turbine speed difference and the feedforward function, and determine the comprehensive valve position instruction according to the valve opening adjustment amount and the power output adjustment value to control the turbine regulating valve; The compensation correction module is used for: in response to controlling the steam turbine to a preset time, compensating the power target value and the comprehensive valve position instruction according to the difference between the pre-calculated frequency modulation theoretical load change and the current frequency modulation actual load change, so that the difference between the frequency modulation theoretical load change and the frequency modulation actual load change meets the preset requirement, wherein, when a frequency modulation action occurs: Compare the calculated load change at the 10th second with the actual load change at the 10th second, and calculate the difference; When the theoretical load change is less than the actual load change, the outputs of the control compensation controller 1 and the compensation controller 2 are 0. When the theoretical load change is greater than the actual load change, the output of the control compensation controller 1 is P1=k1×e1, and the output of the compensation controller 2 is G2=k2×e1. Where: e1 is the difference between the theoretical change and the actual change at the 10th second, k1 and k2 are adjustment coefficients; Compare the calculated load change at the 25th second with the actual load change at the 25th second, and calculate the difference; When the theoretical load change is less than the actual load change, the outputs of the control compensation controller 3 and the compensation controller 4 are controlled to be 0. When the theoretical load change is greater than the actual load change, the output of the control compensation controller 3 is P3=k3×e2; the output of the compensation controller 4 is G4=k4×e2. Where: e2 is the difference between the theoretical change and the actual change at the 25th second, K3 and k4 are adjustment coefficients; The compensation controller 1 and the compensation controller 3 are used to compensate the power target value, and the compensation controller 2 and the compensation controller 4 are used to compensate the comprehensive valve position instruction.

7. The control device for primary frequency modulation parameters of a unit according to claim 6, characterized in that: Before the compensation correction module compensates the power target value and the comprehensive valve position instruction according to the difference between the pre-calculated frequency modulation theoretical load change and the current frequency modulation actual load change, it also includes: Theoretical load calculation module, used to determine the frequency modulation theoretical load change according to the turbine speed difference, primary frequency modulation dead zone, rated speed, rated load change and primary frequency modulation speed inequality; The actual load detection module is used to determine the actual load change of the frequency regulation according to the actual power when the steam turbine is controlled to a preset time.

8. The control device for primary frequency modulation parameters of a unit according to claim 6, characterized in that: The compensation correction module compensates the power target value according to the difference between the pre-calculated frequency regulation theoretical load change and the current frequency regulation actual load change, and is specifically used for: In response to the frequency regulation theoretical load change being greater than the frequency regulation actual load change, a compensation amount for the power target value is determined according to a difference in the change amounts and a first preset adjustment coefficient, and the power target value is compensated.

9. The control device for primary frequency modulation parameters of a unit according to claim 6, characterized in that: The compensation correction module compensates the comprehensive valve position instruction according to the difference between the pre-calculated frequency modulation theoretical load change and the current frequency modulation actual load change, specifically for: In response to the frequency modulation theoretical load change being greater than the frequency modulation actual load change, the compensation amount of the comprehensive valve position instruction is determined according to the difference in the change amounts and a second preset adjustment coefficient, and the comprehensive valve position is compensated.

10. The control device for primary frequency modulation parameters of a unit according to claim 6, characterized in that: The preset time represents a plurality of times determined according to the preset requirements, different load levels and grid frequency change rates.

11. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the steps of the method for controlling the primary frequency modulation parameters of the unit as described in any one of claims 1 to 5 are implemented.

12. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for controlling the primary frequency modulation parameters of the unit as described in any one of claims 1 to 5 are implemented.

13. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instruction is executed by a processor, the steps of the method for controlling the primary frequency modulation parameters of the unit as described in any one of claims 1 to 5 are implemented.

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