Method and apparatus for power control of a gas turbine

Abstract

This application discloses a power control method and apparatus for a gas turbine. The method includes: acquiring the grid disturbance frequency corresponding to the gas turbine; detecting whether the grid disturbance frequency meets preset conditions, wherein the preset conditions characterize that the grid disturbance frequency changes linearly to the preset frequency within a first time period, and the grid disturbance frequency equals the preset frequency within a second time period; if the grid disturbance frequency meets the preset conditions, determining the compensation power value corresponding to the gas turbine based on the grid disturbance frequency, and compensating the actual power value of the gas turbine based on the compensation power value; if the grid disturbance frequency does not meet the preset conditions, compensating the actual power value of the gas turbine based on the grid disturbance frequency. This application solves the technical problem in the prior art of large power fluctuations and poor stability of gas turbines when grid load fluctuates.

Description

Technical Field

[0001] This application relates to the field of power equipment technology and other related technical fields, and more specifically, to a power control method and apparatus for a gas turbine. Background Technology

[0002] A gas turbine is a power generation device that converts energy by burning fuel to produce high-temperature, high-pressure gas, which then drives a turbine. In existing technology, when the grid load connected to the gas turbine fluctuates, technicians typically adjust the gas turbine's speed once based on the rate of change of the grid frequency. Then, the power output of the gas turbine is compensated based on its speed. This method works well when the grid load is stable. However, when the grid load fluctuates significantly, directly adjusting the gas turbine once can lead to excessively large oscillations in its speed or power output. This results in unstable power supply from the gas turbine, or even power outages, leading to large power fluctuations and poor stability.

[0003] There is currently no effective solution to the above problems. Summary of the Invention

[0004] This application provides a power control method for a gas turbine, which at least solves the technical problems of large power fluctuations and poor stability of gas turbines when grid load fluctuates in the prior art.

[0005] According to one aspect of this application, a power control method for a gas turbine is provided, comprising: acquiring a grid disturbance frequency corresponding to the gas turbine, wherein the grid disturbance frequency is used to characterize the rate of change of the grid frequency to which the gas turbine is connected; detecting whether the grid disturbance frequency meets a preset condition, wherein the preset condition is used to characterize that the grid disturbance frequency changes linearly to a preset frequency in a first time period, and the grid disturbance frequency is equal to the preset frequency in a second time period, the duration of the second time period being longer than the duration of the first time period; if the grid disturbance frequency meets the preset condition, determining a compensation power value corresponding to the gas turbine based on the grid disturbance frequency, and compensating the actual power value of the gas turbine based on the compensation power value corresponding to the gas turbine; if the grid disturbance frequency does not meet the preset condition, compensating the actual power value of the gas turbine based on the grid disturbance frequency.

[0006] Optionally, the power control method for the gas turbine further includes: detecting whether the grid disturbance frequency is greater than 0; prohibiting compensation for the actual power value of the gas turbine when the grid disturbance frequency is equal to 0; determining the direction corresponding to the grid disturbance frequency as positive when the grid disturbance frequency is greater than 0, wherein a positive direction indicates that the grid frequency at the current moment is greater than the grid frequency at a historical moment; and determining the direction corresponding to the grid disturbance frequency as negative when the grid disturbance frequency is less than 0, wherein a negative direction indicates that the grid frequency at the current moment is less than the grid frequency at a historical moment.

[0007] Optionally, the preset frequency includes a first preset frequency and a second preset frequency, wherein the first preset frequency and the second preset frequency are opposites of each other.

[0008] Optionally, the power control method for the gas turbine further includes: when the direction corresponding to the grid disturbance frequency is positive, detecting whether the grid disturbance frequency increases linearly to a first preset frequency in a first time period, and whether the grid disturbance frequency is equal to the first preset frequency in a second time period; if the grid disturbance frequency increases linearly to the first preset frequency in the first time period, and the grid disturbance frequency is equal to the first preset frequency in the second time period, determining that the grid disturbance frequency meets the preset condition; if the grid disturbance frequency does not increase linearly to the first preset frequency in the first time period, or the grid disturbance frequency is not equal to the first preset frequency in the second time period, determining that the grid disturbance frequency does not meet the preset condition.

[0009] Optionally, the power control method for the gas turbine further includes: when the direction corresponding to the grid disturbance frequency is negative, detecting whether the grid disturbance frequency decreases linearly to a second preset frequency in a first time period, and whether the grid disturbance frequency is equal to the second preset frequency in a second time period; if the grid disturbance frequency decreases linearly to the second preset frequency in the first time period, and the grid disturbance frequency is equal to the second preset frequency in the second time period, determining that the grid disturbance frequency meets the preset condition; if the grid disturbance frequency does not decrease linearly to the second preset frequency in the first time period, or if the grid disturbance frequency is not equal to the second preset frequency in the second time period, the grid disturbance frequency does not meet the preset condition.

[0010] Optionally, the power control method for the gas turbine further includes: obtaining a power setpoint corresponding to the gas turbine, wherein the power setpoint is used to characterize the preset power of the gas turbine when preset conditions are met; when the direction corresponding to the grid disturbance frequency is positive, determining a compensation power value of the gas turbine based on the power setpoint and a first compensation power value, wherein the first compensation power value is less than 0; when the direction corresponding to the grid disturbance frequency is negative, determining a compensation power value of the gas turbine based on the power setpoint and a second compensation power value, wherein the second compensation power value is greater than 0.

[0011] Optionally, the power control method for the gas turbine further includes: using the sum of the power setpoint and the compensation power value of the gas turbine as the target power value; controlling the actual power value of the gas turbine to increase to the target power value during a third time period; and controlling the actual power value of the gas turbine to equal the target power value during a fourth time period, wherein the duration of the third time period is longer than the duration of the fourth time period.

[0012] Optionally, the power control method for the gas turbine further includes: determining a setpoint for the speed of the gas turbine based on the actual power value of the gas turbine, wherein the setpoint for the speed is used to characterize the speed of the gas turbine when the actual power value is reached; determining a fuel flow command for the gas turbine based on the setpoint for the speed of the gas turbine, wherein the fuel flow command is used to control the amount of fuel supplied to the gas turbine; and controlling the fuel-air ratio of the gas turbine based on the setpoint for the speed of the gas turbine and the fuel flow command, wherein the fuel-air ratio is the ratio of the mass of fuel input to the mass of air input to the gas turbine.

[0013] Optionally, the power control method for the gas turbine further includes: acquiring environmental parameters corresponding to the gas turbine, wherein the environmental parameters include, but are not limited to, temperature parameters and pressure parameters corresponding to the gas turbine; determining the inlet guide vane signal corresponding to the gas turbine based on the speed setpoint, fuel flow command, and environmental parameters corresponding to the gas turbine, wherein the inlet guide vane signal is used to control the opening and closing angle of the inlet guide vane of the gas turbine, and the opening and closing angle of the inlet guide vane is used to control the air input speed corresponding to the gas turbine; and controlling the fuel-air ratio corresponding to the gas turbine based on the inlet guide vane signal of the gas turbine.

[0014] According to another aspect of this application, a power control device for a gas turbine is also provided, comprising: an acquisition unit for acquiring the grid disturbance frequency corresponding to the gas turbine, wherein the grid disturbance frequency is used to characterize the rate of change of the grid frequency to which the gas turbine is connected; a first detection unit for detecting whether the grid disturbance frequency meets a preset condition, wherein the preset condition characterizes that the grid disturbance frequency changes linearly to a preset frequency in a first time period, and the grid disturbance frequency is equal to the preset frequency in a second time period, the duration of the second time period being longer than the duration of the first time period; a first determination unit for determining a compensation power value corresponding to the gas turbine based on the grid disturbance frequency when the grid disturbance frequency meets the preset condition, and compensating the actual power value of the gas turbine based on the compensation power value corresponding to the gas turbine; and a compensation unit for compensating the actual power value of the gas turbine based on the grid disturbance frequency when the grid disturbance frequency does not meet the preset condition.

[0015] According to another aspect of this application, a computer-readable storage medium is also provided, which stores a computer program, wherein the computer program, when running, controls the device where the computer-readable storage medium is located to execute the power control method of the gas turbine described above.

[0016] According to another aspect of this application, an electronic device is also provided, wherein the electronic device includes one or more processors and a memory for storing one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors cause the one or more processors to implement the power control method for a gas turbine as described above.

[0017] In this application, the grid disturbance frequency corresponding to the gas turbine is first obtained, whereby the grid disturbance frequency is used to characterize the rate of change of the grid frequency to which the gas turbine is connected. Then, it is detected whether the grid disturbance frequency meets a preset condition, whereby the preset condition is used to characterize that the grid disturbance frequency changes to the preset frequency linearly in a first time period, and the grid disturbance frequency is equal to the preset frequency in a second time period, the duration of the second time period being longer than the duration of the first time period. Then, if the grid disturbance frequency meets the preset condition, the compensation power value corresponding to the gas turbine is determined based on the grid disturbance frequency, and the actual power value of the gas turbine is compensated based on the compensation power value corresponding to the gas turbine. Finally, if the grid disturbance frequency does not meet the preset condition, the actual power value of the gas turbine is compensated based on the grid disturbance frequency.

[0018] As can be seen from the above, this application first obtains the grid disturbance frequency to which the gas turbine is connected. Then, when the grid disturbance frequency meets the preset conditions, it determines the corresponding compensation power value of the gas turbine. After that, it compensates the actual power value of the gas turbine according to the compensation power value within a preset time period. Compared with the prior art method of adjusting the power of the gas turbine based on the grid disturbance frequency in a single adjustment, the technical solution of this application achieves the purpose of reducing the power fluctuation amplitude of the gas turbine.

[0019] Therefore, the technical solution of this application reduces the probability of gas turbine shutdown due to excessive power fluctuation amplitude by compensating the actual power value of the gas turbine according to the compensation power value within a preset time period, thereby improving the stability of the gas turbine and solving the technical problem of large power variation amplitude and poor stability of gas turbine when the grid load fluctuates in the prior art. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0021] Figure 1 This is a flowchart of an optional power control method for a gas turbine according to an embodiment of this application;

[0022] Figure 2 This is a schematic diagram of an optional power grid disturbance frequency according to an embodiment of this application;

[0023] Figure 3 This is a schematic diagram of an optional function for determining the compensation power value according to an embodiment of this application;

[0024] Figure 4 This is a schematic diagram of an optional actual power value growth curve according to an embodiment of this application;

[0025] Figure 5 This is a flowchart of an optional method for controlling the fuel-air ratio of a gas turbine according to an embodiment of this application;

[0026] Figure 6 This is a flowchart of an optional model-based control gas turbine fuel-air ratio according to an embodiment of this application;

[0027] Figure 7 This is a schematic diagram of an optional gas turbine loaded model according to an embodiment of this application;

[0028] Figure 8 This is a schematic diagram of an optional power control device for a gas turbine according to an embodiment of this application;

[0029] Figure 9 This is a schematic diagram of an optional electronic device according to an embodiment of this application. Detailed Implementation

[0030] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0031] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0032] It should also be noted that all relevant information (including but not limited to information about the power grid to which the gas turbine is connected) and data (including but not limited to data used for display and analysis) involved in this application are information and data authorized by the user or fully authorized by all parties. For example, this system has an interface with the relevant user or organization. Before obtaining relevant information, it needs to send an acquisition request to the aforementioned user or organization through the interface, and obtain the relevant information after receiving consent from the aforementioned user or organization.

[0033] The present application will be further described below with reference to various embodiments.

[0034] Example 1

[0035] According to an embodiment of this application, a power control method for a gas turbine is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0036] This application provides a power control system (hereinafter referred to as the control system) based on a gas turbine for executing the power control method of the gas turbine in this application. Figure 1 This is a flowchart of an optional power control method for a gas turbine according to an embodiment of this application, such as... Figure 1 As shown, the method includes the following steps:

[0037] Step S101: Obtain the grid disturbance frequency corresponding to the gas turbine.

[0038] In step S101, the grid disturbance frequency is used to characterize the rate of change of the grid frequency to which the gas turbine is connected.

[0039] Optionally, the causes of frequency disturbances in the power grid to which the gas turbine is connected include, but are not limited to: natural disasters, power supply and demand imbalances in the power grid, and generator failures.

[0040] Optionally, the control system uses a frequency measuring instrument to obtain the grid frequency of the gas turbine connected to the grid at preset time intervals. Then, it calculates the frequency difference between the grid frequency at the current moment and the grid frequency at historical moments, and calculates the percentage of the above frequency difference to the grid frequency to obtain the rate of change of the grid frequency Δf (i.e., the grid disturbance frequency corresponding to the gas turbine).

[0041] Step S102: Detect whether the power grid disturbance frequency meets the preset conditions.

[0042] In step S102, the preset condition is used to characterize that the power grid disturbance frequency changes linearly to the preset frequency in the first time period, and the power grid disturbance frequency is equal to the preset frequency in the second time period, and the duration of the second time period is greater than the duration of the first time period.

[0043] Optionally, assuming the first time period is 10 seconds, the second time period is 20 seconds, and the preset frequency is 1%, Figure 2 This is a schematic diagram of an optional power grid disturbance frequency according to an embodiment of this application, such as... Figure 2 As shown, Figure 2 The horizontal axis in the coordinate system represents time. Figure 2 The vertical axis in the coordinate system represents the rate of change of the power grid frequency, Δf. The rate of change of the power grid frequency, Δf, increases linearly to 1% in the first time period (10 seconds), and equals 1% in the second time period (20 seconds). Figure 2 The power grid disturbance frequency meets the preset conditions.

[0044] Step S103: If the grid disturbance frequency meets the preset conditions, determine the corresponding compensation power value of the gas turbine based on the grid disturbance frequency, and compensate the actual power value of the gas turbine based on the corresponding compensation power value of the gas turbine.

[0045] Optionally, after determining the direction corresponding to the grid disturbance frequency, and if the direction corresponding to the grid disturbance frequency is positive, the system detects whether the grid disturbance frequency increases linearly to a first preset frequency in a first time period, and whether the grid disturbance frequency is equal to the first preset frequency in a second time period. If the direction corresponding to the grid disturbance frequency is negative, the system detects whether the grid disturbance frequency decreases linearly to a second preset frequency in a first time period, and whether the grid disturbance frequency is equal to the second preset frequency in a second time period. The first preset frequency and the second preset frequency are opposites of each other. Then, the control system determines the compensation power value corresponding to the gas turbine based on the direction corresponding to the grid disturbance frequency.

[0046] Step S104: If the grid disturbance frequency does not meet the preset conditions, the actual power value of the gas turbine is compensated according to the grid disturbance frequency.

[0047] As can be seen from the above, this application first obtains the grid disturbance frequency to which the gas turbine is connected. Then, when the grid disturbance frequency meets the preset conditions, it determines the corresponding compensation power value of the gas turbine. After that, it compensates the actual power value of the gas turbine according to the compensation power value within a preset time period. Compared with the prior art method of adjusting the power of the gas turbine based on the grid disturbance frequency in a single adjustment, the technical solution of this application achieves the purpose of reducing the power fluctuation amplitude of the gas turbine.

[0048] Therefore, the technical solution of this application reduces the probability of gas turbine shutdown due to excessive power fluctuation amplitude by compensating the actual power value of the gas turbine according to the compensation power value within a preset time period, thereby improving the stability of the gas turbine and solving the technical problem of large power variation amplitude and poor stability of gas turbine when the grid load fluctuates in the prior art.

[0049] In one optional embodiment, the control system first detects whether the grid disturbance frequency is greater than 0. Second, if the grid disturbance frequency is equal to 0, compensation for the actual power value of the gas turbine is prohibited. Then, if the grid disturbance frequency is greater than 0, the direction corresponding to the grid disturbance frequency is determined to be positive, where a positive direction indicates that the current grid frequency is greater than the grid frequency at a historical time. Afterward, if the grid disturbance frequency is less than 0, the direction corresponding to the grid disturbance frequency is determined to be negative, where a negative direction indicates that the current grid frequency is less than the grid frequency at a historical time.

[0050] Optionally, the above-mentioned grid disturbance frequency being equal to 0 indicates that the grid frequency corresponding to the grid to which the gas turbine is connected does not change within a preset time period, so the actual power value of the gas turbine does not need to be compensated. In addition, after determining the direction corresponding to the grid disturbance frequency, the control system determines the compensation power value of the gas turbine based on the direction corresponding to the grid disturbance frequency and the power setpoint.

[0051] Optionally, the preset frequency includes a first preset frequency and a second preset frequency, wherein the first preset frequency and the second preset frequency are opposites of each other.

[0052] In one optional embodiment, the control system first detects whether the power grid disturbance frequency increases linearly to a first preset frequency in a first time period, and whether the power grid disturbance frequency is equal to the first preset frequency in a second time period, when the direction corresponding to the power grid disturbance frequency is positive. Then, if the power grid disturbance frequency increases linearly to the first preset frequency in the first time period and is equal to the first preset frequency in the second time period, the control system determines that the power grid disturbance frequency meets the preset condition. Finally, if the power grid disturbance frequency does not increase linearly to the first preset frequency in the first time period, or if the power grid disturbance frequency is not equal to the first preset frequency in the second time period, the control system determines that the power grid disturbance frequency does not meet the preset condition.

[0053] For example, if the direction corresponding to the power grid disturbance frequency is positive, and assuming the first preset frequency is equal to 1%, if the rate of change of the power grid frequency Δf increases linearly from 0% to 1% within 10s, and the rate of change of the power grid frequency Δf remains unchanged at 1% during the following 20s, then the power grid disturbance frequency meets the preset condition.

[0054] In one optional embodiment, the control system first detects whether the grid disturbance frequency decreases linearly to a second preset frequency in a first time period when the direction corresponding to the grid disturbance frequency is negative, and whether the grid disturbance frequency is equal to the second preset frequency in a second time period. Then, if the grid disturbance frequency decreases linearly to the second preset frequency in the first time period and is equal to the second preset frequency in the second time period, the control system determines that the grid disturbance frequency meets the preset condition. Finally, if the grid disturbance frequency does not decrease linearly to the second preset frequency in the first time period, or is not equal to the second preset frequency in the second time period, the grid disturbance frequency does not meet the preset condition.

[0055] For example, if the direction of the power grid disturbance frequency is negative, and the second preset frequency is equal to -1%, if the rate of change of the power grid frequency Δf decreases linearly from 0% to -1% within 10s, and the rate of change of the power grid frequency Δf remains unchanged at -1% during the following 20s, then the power grid disturbance frequency meets the preset condition.

[0056] In one optional embodiment, the control system first obtains a power setpoint corresponding to the gas turbine, wherein the power setpoint is used to characterize the preset power of the gas turbine when preset conditions are met. Then, when the direction corresponding to the grid disturbance frequency is positive, the compensation power value of the gas turbine is determined according to the power setpoint and a first compensation power value, wherein the first compensation power value is less than 0. When the direction corresponding to the grid disturbance frequency is negative, the compensation power value of the gas turbine is determined according to the power setpoint and a second compensation power value, wherein the second compensation power value is greater than 0.

[0057] Optionally, Figure 3 This is a schematic diagram of an optional function for determining the compensation power value according to an embodiment of this application. Figure 3 The horizontal axis in the coordinate system represents the percentage of the power setpoint to the current rated power of the gas turbine, and the vertical axis represents the percentage of the compensation power to the current rated power of the gas turbine.

[0058] For example, when the direction corresponding to the grid disturbance frequency is positive and the preset conditions are met, in the third time period, the percentage of the compensation power value is first controlled to rise linearly to -15%, where the percentage of the compensation power value is the percentage of the compensation power relative to the current rated power value of the gas turbine. Then, the percentage of the compensation power value is controlled to remain unchanged at -15% until the percentage of the power setpoint is 95%, where the percentage of the power setpoint is the percentage of the power setpoint relative to the current rated power value of the gas turbine. Finally, the percentage of the compensation power value is controlled to decrease linearly to 0%, until the percentage of the power setpoint is 100%.

[0059] In addition, when the direction corresponding to the grid disturbance frequency is negative and the preset conditions are met, the percentage of the compensation power value is first controlled to remain unchanged at 15% during the third time period until the percentage of the power setpoint is 80%. Then, the percentage of the compensation power value is controlled to decrease to 0% in a linear manner until the percentage of the power setpoint is 100%.

[0060] In one optional embodiment, the control system first uses the sum of the power setpoint and the compensation power value of the gas turbine as the target power value. Then, during a third time period, it controls the power value corresponding to the actual power value of the gas turbine to increase to the target power value. Finally, during a fourth time period, it controls the power value corresponding to the actual power value of the gas turbine to be equal to the target power value. The duration of the third time period is longer than the duration of the fourth time period.

[0061] For example, assuming the third time interval is 20 seconds and the fourth time interval is 10 seconds, optionally... Figure 4 This is a schematic diagram of an optional actual power value growth curve according to an embodiment of this application. Figure 4 In the coordinate system, the horizontal axis represents time, and the vertical axis represents the percentage of the gas turbine's actual power value relative to the target power value at the current moment. Figure 4 As shown, the growth function corresponding to the actual power value of the gas turbine in the third time period is a smooth curve. In the fourth time period, the actual power value is kept constant, and the actual power value of the gas turbine is equal to the target power value in the fourth time period. Compared with the existing technology of adjusting the power of the gas turbine once based on the frequency of grid disturbance, the technical solution of this application achieves the purpose of reducing the fluctuation amplitude of the power of the gas turbine.

[0062] In one alternative embodiment, Figure 5 This is a flowchart of an optional method for controlling the fuel-air ratio of a gas turbine according to an embodiment of this application, as shown below. Figure 5 As shown, the method includes the following steps:

[0063] In step S501, the control system first determines the corresponding speed setpoint of the gas turbine based on the actual power value of the gas turbine.

[0064] In step S501, the speed setpoint is used to characterize the speed value of the gas turbine when the actual power value is reached.

[0065] Step S502: Determine the corresponding fuel flow command for the gas turbine based on the speed setpoint of the gas turbine.

[0066] In step S502, the fuel flow command is used to control the amount of fuel supplied to the gas turbine.

[0067] Step S503: Control the fuel-air ratio of the gas turbine according to the speed setpoint and fuel flow command of the gas turbine.

[0068] In step S503, the fuel-air ratio is the ratio of the mass of fuel input to the mass of air input to the gas turbine.

[0069] In one optional embodiment, the control system first acquires the environmental parameters corresponding to the gas turbine, including but not limited to the temperature and pressure parameters corresponding to the gas turbine. Then, based on the speed setpoint, fuel flow command, and environmental parameters corresponding to the gas turbine, the control system determines the inlet guide vane signal corresponding to the gas turbine. The inlet guide vane signal is used to control the opening and closing angle of the inlet guide vane of the gas turbine, and the opening and closing angle of the inlet guide vane is used to control the air input speed corresponding to the gas turbine. Finally, the control system controls the fuel-air ratio corresponding to the gas turbine based on the inlet guide vane signal of the gas turbine.

[0070] In existing technologies, the opening and closing angle of the gas turbine inlet guide vanes is usually determined based on the exhaust temperature of the gas turbine. However, the exhaust temperature of a gas turbine changes relatively slowly, so the speed of determining the opening and closing angle of the gas turbine inlet guide vanes based on the change in exhaust temperature is relatively lagging, which leads to the technical problem of low efficiency in adjusting the fuel-air ratio of the gas turbine.

[0071] The technical solution of this application determines the inlet guide vane signal of the gas turbine by using the speed setpoint, fuel flow command and environmental parameters corresponding to the gas turbine, and then adjusts the opening and closing angle of the inlet guide vane according to the inlet guide vane signal, thereby achieving the technical effect of improving the efficiency of adjusting the fuel-air ratio of the gas turbine.

[0072] In one alternative embodiment, Figure 6 This is a flowchart of an optional model-based control gas turbine fuel-air ratio according to an embodiment of this application, such as... Figure 6As shown, the process involves obtaining the power setpoint and power measurement values ​​for the gas turbine. The power measurement value represents the actual power of the gas turbine at the current moment, while the power setpoint represents the actual power of the gas turbine at historical moments (or the average actual power of the gas turbine over a historical period). Next, the speed setpoint of the gas turbine at the current moment is determined based on a power load algorithm and a speed adjustment algorithm. The power load algorithm determines the speed adjustment command based on the difference between the power setpoint and the power measurement value (corresponding to the compensation power value). The speed adjustment algorithm determines the speed setpoint of the gas turbine based on the speed adjustment command, which is used to adjust the actual power of the gas turbine. Then, the speed measurement value of the gas turbine is obtained, representing the actual speed of the gas turbine at the current moment. Finally, based on the speed setpoint and speed measurement value, the fuel flow command of the gas turbine is determined using a fuel setpoint algorithm. Finally, the corresponding IGV (Inlet Guide) for the gas turbine is determined based on the fuel flow command, actual measurement parameters, and the target power value. Vanes (imported adjustable guide vanes) opening commands, where the actual measured parameters include, but are not limited to, the ambient temperature, atmospheric pressure, inlet pressure, and compressor exhaust pressure corresponding to the gas turbine. Finally, the combustion temperature, exhaust temperature, power load, pressure ratio, IGV opening, and actual measured parameters of the gas turbine are displayed in the form of charts on the target screen. The target screen is used to represent the visualization interface of the control system or other equipment connected to the control system, and the target screen is also used to provide human-machine interaction functions, that is, users are allowed to view the details of the gas turbine parameters by touching, clicking, dragging, etc.

[0073] In one alternative embodiment, Figure 7 This is a schematic diagram of an optional gas turbine loaded model according to an embodiment of this application, such as... Figure 7 As shown, firstly, the grid disturbance frequency of the gas turbine connected to the grid is obtained. Based on the grid disturbance frequency, the power command of the gas turbine load model is determined. The power command is used to adjust the actual power value of the gas turbine. Then, based on the power command and the gas turbine control strategy, the FSR (Fuel Stroke Reference) information is determined. Figure 7 (shown using FSROUT and FSRGOUT) and fuel flow instructions ( Figure 7 (Shown using CSRGVOUT), then the control gas fuel system determines the heat consumption value based on FSR information and inputs the heat consumption value into the gas turbine's mathematical model. Simultaneously, the control servo mechanism inputs fuel flow commands into the gas turbine's mathematical model. Finally, the control gas turbine's mathematical model, based on ambient temperature and pressure values ​​(…),… Figure 7Using P1, P2, P3, and P4 (shown), the heat consumption value and fuel flow command are used to determine the IGV opening degree, and the actual power value of the gas turbine is adjusted according to the IGV opening degree. Then, the IGV opening degree, combustion temperature, exhaust temperature and power load information corresponding to the gas turbine are input to the target screen for display. The target screen is used to represent the visualization interface of the control system or other equipment connected to the control system, and the target screen is also used to provide human-machine interaction functions.

[0074] As can be seen from the above, this application first obtains the grid disturbance frequency to which the gas turbine is connected. Then, when the grid disturbance frequency meets the preset conditions, it determines the corresponding compensation power value of the gas turbine. After that, it compensates the actual power value of the gas turbine according to the compensation power value within a preset time period. Compared with the prior art method of adjusting the power of the gas turbine based on the grid disturbance frequency in a single adjustment, the technical solution of this application achieves the purpose of reducing the power fluctuation amplitude of the gas turbine.

[0075] Therefore, the technical solution of this application reduces the probability of gas turbine shutdown due to excessive power fluctuation amplitude by compensating the actual power value of the gas turbine according to the compensation power value within a preset time period, thereby improving the stability of the gas turbine and solving the technical problem of large power variation amplitude and poor stability of gas turbine when the grid load fluctuates in the prior art.

[0076] Example 2

[0077] According to an embodiment of this application, an embodiment of a power control device for a gas turbine is provided. Figure 8 This is a schematic diagram of an optional power control device for a gas turbine according to an embodiment of this application, as shown below. Figure 8 As shown, the power control device for the gas turbine includes: an acquisition unit 801, a first detection unit 802, a first determination unit 803, and a compensation unit 804.

[0078] Optionally, the acquisition unit is used to acquire the grid disturbance frequency corresponding to the gas turbine, wherein the grid disturbance frequency is used to characterize the rate of change of the grid frequency to which the gas turbine is connected; the first detection unit is used to detect whether the grid disturbance frequency meets a preset condition, wherein the preset condition is used to characterize that the grid disturbance frequency changes linearly to a preset frequency in a first time period, and the grid disturbance frequency is equal to the preset frequency in a second time period, the duration of the second time period is longer than the duration of the first time period; the first determination unit is used to determine the compensation power value corresponding to the gas turbine based on the grid disturbance frequency when the grid disturbance frequency meets the preset condition, and to compensate the actual power value of the gas turbine based on the compensation power value corresponding to the gas turbine; the compensation unit is used to compensate the actual power value of the gas turbine based on the grid disturbance frequency when the grid disturbance frequency does not meet the preset condition.

[0079] In one optional embodiment, the power control device for the gas turbine further includes: a second detection unit, a compensation prohibition unit, a second determination unit, and a third determination unit.

[0080] Optionally, the second detection unit is used to detect whether the grid disturbance frequency is greater than 0; the compensation prohibition unit is used to prohibit compensation for the actual power value of the gas turbine when the grid disturbance frequency is equal to 0; the second determination unit is used to determine that the direction corresponding to the grid disturbance frequency is positive when the grid disturbance frequency is greater than 0, wherein the direction corresponding to the grid disturbance frequency is positive indicates that the grid frequency at the current moment is greater than the grid frequency at a historical moment; and the third determination unit is used to determine that the direction corresponding to the grid disturbance frequency is negative when the grid disturbance frequency is less than 0, wherein the direction corresponding to the grid disturbance frequency is negative indicates that the grid frequency at the current moment is less than the grid frequency at a historical moment.

[0081] Optionally, the preset frequency in the power control device of the gas turbine includes a first preset frequency and a second preset frequency, wherein the first preset frequency and the second preset frequency are opposites of each other.

[0082] In one optional embodiment, the first detection unit further includes: a first detection subunit, a first determination subunit, and a second determination subunit.

[0083] Optionally, the first detection subunit is used to detect whether the power grid disturbance frequency increases linearly to a first preset frequency in a first time period and whether the power grid disturbance frequency is equal to the first preset frequency in a second time period when the direction corresponding to the power grid disturbance frequency is positive; the first determination subunit is used to determine that the power grid disturbance frequency meets a preset condition when the power grid disturbance frequency increases linearly to the first preset frequency in the first time period and the power grid disturbance frequency is equal to the first preset frequency in the second time period; and the second determination subunit is used to determine that the power grid disturbance frequency does not meet the preset condition when the power grid disturbance frequency does not increase linearly to the first preset frequency in the first time period or the power grid disturbance frequency is not equal to the first preset frequency in the second time period.

[0084] In one optional embodiment, the first detection unit further includes a second detection subunit, a third determination subunit, and a fourth determination subunit.

[0085] Optionally, the second detection subunit is used to detect whether the power grid disturbance frequency decreases linearly to a second preset frequency in the first time period when the direction corresponding to the power grid disturbance frequency is negative, and whether the power grid disturbance frequency is equal to the second preset frequency in the second time period. The third determination subunit is used to determine that the power grid disturbance frequency meets the preset condition when the power grid disturbance frequency decreases linearly to the second preset frequency in the first time period and the power grid disturbance frequency is equal to the second preset frequency in the second time period. The fourth determination subunit is used to determine that the power grid disturbance frequency does not meet the preset condition when the power grid disturbance frequency does not decrease linearly to the second preset frequency in the first time period, or when the power grid disturbance frequency is not equal to the second preset frequency in the second time period.

[0086] In an optional embodiment, the first determining unit further includes: a first acquiring subunit, a fifth determining subunit, and a sixth determining subunit.

[0087] Optionally, a first acquisition subunit is used to acquire a power setpoint corresponding to the gas turbine, wherein the power setpoint is used to characterize the preset power of the gas turbine when preset conditions are met; a fifth determination subunit is used to determine the compensation power value of the gas turbine based on the power setpoint and a first compensation power value when the direction corresponding to the grid disturbance frequency is positive, wherein the first compensation power value is less than 0; and a sixth determination subunit is used to determine the compensation power value of the gas turbine based on the power setpoint and a second compensation power value when the direction corresponding to the grid disturbance frequency is negative, wherein the second compensation power value is greater than 0.

[0088] In an optional embodiment, the first determining unit further includes a seventh determining subunit, a first control subunit, and a second control subunit.

[0089] Optionally, a seventh determining subunit is used to take the sum of the power setpoint and the compensation power value of the gas turbine as the target power value; a first control subunit is used to control the power value corresponding to the actual power value of the gas turbine to increase to the target power value within a third time period; and a second control subunit is used to control the power value corresponding to the actual power value of the gas turbine to be equal to the target power value within a fourth time period, wherein the duration of the third time period is longer than the duration of the fourth time period.

[0090] In one optional embodiment, the power control device for the gas turbine further includes a fourth determining unit, a fifth determining unit, and a control unit.

[0091] Optionally, the fourth determining unit is used to determine the speed setpoint corresponding to the gas turbine based on the actual power value of the gas turbine, wherein the speed setpoint is used to characterize the speed value of the gas turbine when the actual power value is reached; the fifth determining unit is used to determine the fuel flow command corresponding to the gas turbine based on the speed setpoint of the gas turbine, wherein the fuel flow command is used to control the fuel supply of the gas turbine; and the control unit is used to control the fuel-air ratio corresponding to the gas turbine based on the speed setpoint of the gas turbine and the fuel flow command, wherein the fuel-air ratio is the ratio of the mass of fuel input to the mass of air input to the gas turbine.

[0092] In one alternative embodiment, the control unit further includes a second acquisition subunit, an eighth determination subunit, and a first control unit.

[0093] The second acquisition subunit is used to acquire the environmental parameters corresponding to the gas turbine, including but not limited to the temperature and pressure parameters corresponding to the gas turbine. The eighth determination subunit is used to determine the inlet guide vane signal corresponding to the gas turbine based on the speed setpoint, fuel flow command, and environmental parameters corresponding to the gas turbine. The inlet guide vane signal is used to control the opening and closing angle of the inlet guide vane of the gas turbine, and the opening and closing angle of the inlet guide vane is used to control the air input speed corresponding to the gas turbine. The control subunit is used to control the fuel-air ratio corresponding to the gas turbine based on the inlet guide vane signal of the gas turbine.

[0094] As can be seen from the above, this application first obtains the grid disturbance frequency to which the gas turbine is connected. Then, when the grid disturbance frequency meets the preset conditions, it determines the corresponding compensation power value of the gas turbine. After that, it compensates the actual power value of the gas turbine according to the compensation power value within a preset time period. Compared with the prior art method of adjusting the power of the gas turbine based on the grid disturbance frequency in a single adjustment, the technical solution of this application achieves the purpose of reducing the power fluctuation amplitude of the gas turbine.

[0095] Therefore, the technical solution of this application reduces the probability of gas turbine shutdown due to excessive power fluctuation amplitude by compensating the actual power value of the gas turbine according to the compensation power value within a preset time period, thereby improving the stability of the gas turbine and solving the technical problem of large power variation amplitude and poor stability of gas turbine when the grid load fluctuates in the prior art.

[0096] According to another aspect of the embodiments of this application, a computer-readable storage medium is also provided, the computer-readable storage medium including a stored computer program, wherein, when the computer program is running, it controls the device where the computer-readable storage medium is located to execute the power control method of any one of the above embodiments 1 for a gas turbine.

[0097] According to another aspect of the embodiments of this application, an electronic device is also provided, including: a processor; and a memory for storing executable instructions of the processor; wherein the processor is configured to execute the power control method of any one of the above embodiments 1 by executing the executable instructions.

[0098] Figure 9 This is a schematic diagram of an optional electronic device according to an embodiment of this application, such as... Figure 9 As shown, this application provides an electronic device, which includes a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, it implements the power control method for a gas turbine as described in any of the embodiments in 1 above.

[0099] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0100] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0101] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0102] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0103] These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable apparatus for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0104] In a typical configuration, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory. Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0105] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0106] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0107] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0108] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A method of power control of a gas turbine, characterized in that, include: Obtain the grid disturbance frequency corresponding to the gas turbine, wherein the grid disturbance frequency is used to characterize the rate of change of the grid frequency to which the gas turbine is connected; The power grid disturbance frequency is detected to meet a preset condition, wherein the preset condition is used to characterize that the power grid disturbance frequency changes to a preset frequency in a linear manner during a first time period, and the power grid disturbance frequency is equal to the preset frequency during a second time period, wherein the duration of the second time period is greater than the duration of the first time period. When the power grid disturbance frequency meets the preset conditions, the compensation power value corresponding to the gas turbine is determined based on the power grid disturbance frequency, and the actual power value of the gas turbine is compensated based on the compensation power value corresponding to the gas turbine. If the grid disturbance frequency does not meet the preset conditions, the actual power value of the gas turbine is compensated based on the grid disturbance frequency. When the grid disturbance frequency meets the preset conditions, the compensation power value corresponding to the gas turbine is determined based on the grid disturbance frequency, including: Obtain the power setpoint value corresponding to the gas turbine, wherein the power setpoint value is used to characterize the preset power of the gas turbine when the preset conditions are met; When the direction corresponding to the power grid disturbance frequency is positive, the compensation power value of the gas turbine is determined according to the power setpoint and the first compensation power value, wherein the first compensation power value is less than 0, and the direction corresponding to the power grid disturbance frequency is positive means that the power grid disturbance frequency is greater than 0; When the direction corresponding to the grid disturbance frequency is negative, the compensation power value of the gas turbine is determined according to the power setpoint and the second compensation power value, wherein the second compensation power value is greater than 0, and the direction corresponding to the grid disturbance frequency is negative means that the grid disturbance frequency is less than 0.

2. The method of power control of a gas turbine according to claim 1, characterized in that, Before detecting whether the power grid disturbance frequency meets the preset conditions, the power control method of the gas turbine further includes: Detect whether the frequency of the power grid disturbance is greater than 0; When the power grid disturbance frequency is equal to 0, compensation for the actual power value of the gas turbine is prohibited. When the power grid disturbance frequency is greater than 0, the direction corresponding to the power grid disturbance frequency is determined to be positive, wherein the positive direction corresponding to the power grid disturbance frequency indicates that the power grid frequency at the current moment is greater than the power grid frequency at a historical moment. When the power grid disturbance frequency is less than 0, the direction corresponding to the power grid disturbance frequency is determined to be negative, wherein the negative direction corresponding to the power grid disturbance frequency indicates that the power grid frequency at the current moment is less than the power grid frequency at the historical moment.

3. The method of power control of a gas turbine according to claim 2, characterized in that, The preset frequency includes a first preset frequency and a second preset frequency, wherein the first preset frequency and the second preset frequency are opposites of each other.

4. The power control method for a gas turbine according to claim 3, characterized in that, Detecting whether the power grid disturbance frequency meets preset conditions includes: When the direction corresponding to the power grid disturbance frequency is positive, it is detected whether the power grid disturbance frequency increases linearly to the first preset frequency during the first time period, and whether the power grid disturbance frequency is equal to the first preset frequency during the second time period. If the power grid disturbance frequency increases linearly to the first preset frequency during the first time period, and the power grid disturbance frequency is equal to the first preset frequency during the second time period, then the power grid disturbance frequency is determined to meet the preset condition. If the power grid disturbance frequency does not increase linearly to the first preset frequency during the first time period, or if the power grid disturbance frequency is not equal to the first preset frequency during the second time period, it is determined that the power grid disturbance frequency does not meet the preset condition.

5. The power control method for a gas turbine according to claim 3, characterized in that, Detecting whether the power grid disturbance frequency meets preset conditions includes: When the direction corresponding to the power grid disturbance frequency is negative, it is detected whether the power grid disturbance frequency decreases to the second preset frequency in a linear manner during the first time period, and whether the power grid disturbance frequency is equal to the second preset frequency during the second time period. If the power grid disturbance frequency decreases linearly to the second preset frequency during the first time period, and the power grid disturbance frequency is equal to the second preset frequency during the second time period, then the power grid disturbance frequency is determined to meet the preset condition. If the power grid disturbance frequency does not decrease linearly to the second preset frequency within the first time period, or if the power grid disturbance frequency is not equal to the second preset frequency within the second time period, the power grid disturbance frequency does not meet the preset condition.

6. The power control method for a gas turbine according to claim 1, characterized in that, The actual power value of the gas turbine is compensated based on the compensation power value corresponding to the gas turbine, including: The sum of the power setpoint of the gas turbine and the compensation power value is taken as the target power value; During the third time period, the actual power value of the gas turbine is controlled to increase to the target power value; During the fourth time period, the actual power value of the gas turbine is controlled to be equal to the target power value, wherein the duration of the third time period is greater than the duration of the fourth time period.

7. The power control method for a gas turbine according to claim 1, characterized in that, After compensating the actual power value of the gas turbine according to the compensation power value corresponding to the gas turbine, the power control method of the gas turbine further includes: The speed setpoint of the gas turbine is determined based on the actual power value of the gas turbine, wherein the speed setpoint is used to characterize the speed value of the gas turbine when the actual power value is reached; The fuel flow command corresponding to the gas turbine is determined based on the setpoint of the gas turbine speed, wherein the fuel flow command is used to control the fuel supply to the gas turbine. The fuel-air ratio of the gas turbine is controlled according to the speed setpoint and fuel flow command of the gas turbine, wherein the fuel-air ratio is the ratio of the mass of fuel input to the mass of air input to the gas turbine.

8. The power control method for a gas turbine according to claim 7, characterized in that, Controlling the fuel-air ratio of the gas turbine according to the speed setpoint and fuel flow command includes: Obtain the environmental parameters corresponding to the gas turbine, wherein the environmental parameters include at least the temperature parameters and pressure parameters corresponding to the gas turbine; The inlet guide vane signal of the gas turbine is determined based on the speed setpoint of the gas turbine, the fuel flow command, and the environmental parameters. The inlet guide vane signal is used to control the opening and closing angle of the inlet guide vane of the gas turbine, and the opening and closing angle of the inlet guide vane is used to control the air input speed of the gas turbine. The fuel-air ratio of the gas turbine is controlled based on the inlet guide vane signal of the gas turbine.

9. A power control device for a gas turbine, characterized in that, include: An acquisition unit is used to acquire the grid disturbance frequency corresponding to the gas turbine, wherein the grid disturbance frequency is used to characterize the rate of change of the grid frequency to which the gas turbine is connected; The first detection unit is used to detect whether the power grid disturbance frequency meets a preset condition, wherein the preset condition is used to characterize that the power grid disturbance frequency changes to a preset frequency in a linear manner within a first time period, and the power grid disturbance frequency is equal to the preset frequency within a second time period, and the duration of the second time period is greater than the duration of the first time period. The first determining unit is configured to, when the power grid disturbance frequency meets the preset conditions, determine the compensation power value corresponding to the gas turbine based on the power grid disturbance frequency, and compensate the actual power value of the gas turbine based on the compensation power value corresponding to the gas turbine. The compensation unit is used to compensate the actual power value of the gas turbine according to the grid disturbance frequency when the grid disturbance frequency does not meet the preset conditions. The first determining unit further includes: a first obtaining subunit, used to obtain a power setpoint value corresponding to the gas turbine, wherein the power setpoint value is used to characterize the preset power of the gas turbine when the preset conditions are met; a fifth determining subunit, used to determine the compensation power value of the gas turbine according to the power setpoint value and a first compensation power value when the direction corresponding to the grid disturbance frequency is positive, wherein the first compensation power value is less than 0, and the direction corresponding to the grid disturbance frequency is positive means that the grid disturbance frequency is greater than 0; a sixth determining subunit, used to determine the compensation power value of the gas turbine according to the power setpoint value and a second compensation power value when the direction corresponding to the grid disturbance frequency is negative, wherein the second compensation power value is greater than 0, and the direction corresponding to the grid disturbance frequency is negative means that the grid disturbance frequency is less than 0.

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