CN110867893B - Primary frequency modulation control method and device of combined cycle unit - Google Patents
Primary frequency modulation control method and device of combined cycle unit Download PDFInfo
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- H—ELECTRICITY
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- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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Abstract
The invention discloses a primary frequency modulation control method and a primary frequency modulation control device of a combined cycle unit, wherein the method comprises the following steps: receiving and acquiring the operation information of the combustion engine and the load preset value of the combustion engine, wherein the operation information of the combustion engine comprises: the method comprises the following steps of obtaining gas turbine rotating speed information, gas turbine operation mode information and gas turbine load information, wherein the gas turbine operation mode information comprises the following steps: a rotation speed control mode and a load control mode; performing virtual compensation processing on the rotation speed information and the load information of the gas turbine according to the operation mode information and the load preset value of the gas turbine to generate a frequency modulation load component and a feedforward frequency modulation flow component; generating a new gas turbine load preset value according to the frequency modulation load component, the gas turbine load preset value and the gas turbine load information; carrying out proportional integral operation on the new load preset value of the combustion engine; and performing primary frequency modulation processing on the combined cycle unit according to the load value of the combustion engine and the feedforward frequency modulation flow component after the proportional-integral operation. By the invention, the accuracy and the rapidity of primary frequency modulation action can be improved.
Description
Technical Field
The invention relates to the field of power generation, in particular to a primary frequency modulation control method and device of a combined cycle unit.
Background
The primary frequency modulation is an important frequency adjustment means of a power grid, and as the proportion of the total amount of the gas-steam combined cycle machine assembling machine in the power grid is gradually increased, the dynamic characteristic of the primary frequency modulation is used as an important content of network plant coordination, and the safe and stable operation of the system is obviously influenced. In recent years, with the accelerated construction of extra-high voltage power grids and the large access of clean energy, the requirement of the power grids on the primary frequency modulation performance of a gas-steam combined cycle unit is continuously increased. On one hand, the accelerated construction of the extra-high voltage power grid and the continuous increase of the installed capacity of new energy provide higher requirements for the frequency modulation performance of a thermal power generating unit (coal-fired and gas-fired) serving as a peak-load frequency modulation main power in order to ensure the safe and stable operation of the power grid after the large-scale intermittent energy is accessed; on the other hand, the upgrading and reconstruction of the coal-electricity energy conservation and emission reduction also provides stricter environmental emission and energy-saving indexes for the power supply side unit, which objectively causes certain negative effects on the frequency modulation performance of the thermal power unit (and the gas combined cycle unit). In the future, large-scale new energy grid connection (mainly wind power) and the operation of extra-high voltage direct current (a plurality of extra-high voltage direct currents of a north China power grid can be operated in succession) lead the power impact of the power grid to be upgraded on a large scale and the frequency safety risk to be aggravated. Therefore, a reasonable and effective primary frequency modulation control system of the gas-steam combined cycle unit is very critical and necessary.
The primary frequency modulation function of the traditional thermal power generating unit is relatively perfect, the gas-steam combined cycle unit is different from the traditional thermal power, a steam turbine of the traditional thermal power generating unit generally does not have the frequency modulation capability, and a gas turbine control system automatically changes the power of the gas turbine to adapt to load change by adjusting a fuel instruction and the opening degree of an IGV (Inlet guide vane) air Inlet baffle according to the frequency change of a power grid. At present, most heavy-duty gas turbine power generation systems do not have the primary frequency modulation function or only have the most basic primary frequency modulation function, which is mainly determined by the gas turbine control system function.
Fig. 1 is a schematic diagram of a primary frequency modulation control of a gas turbine, and as shown in fig. 1, a primary frequency modulation of the gas turbine outputs a frequency difference signal through a regulator and then is superimposed on an inlet instruction of a power regulator.
The frequency modulation load is converted by a single primary frequency modulation frequency difference function and is superposed on a load instruction of the combustion engine to increase or decrease the output of the combustion engine. The frequency modulation load command is sent to a PI (proportional integral) controller, and is not directly acted on a fuel command, so that the response speed of primary frequency modulation is relatively slow through the adjustment of the PI controller. The control method is difficult to meet the operation and assessment standards of the power grid in China in speed and flexibility.
At present, a frequency modulation (frequency difference-load) characteristic curve in a frequency modulation control loop has a fixed slope for a whole-course load section, namely, a frequency modulation function is set according to a frequency modulation parameter with an unequal rate set as a fixed value, and according to actual operation experience and routine experiments, the frequency modulation characteristics of a unit have larger difference under different load sections and different slip. Therefore, although the existing frequency modulation loop enables the unit to have a basic primary frequency modulation function, the primary frequency modulation performance of a full load section, especially under a small frequency difference, cannot be ensured, and in addition, the requirement of a power grid on the primary frequency modulation rapidity of the unit cannot be met by a single outer-loop (closed-loop) frequency modulation load increment.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for controlling primary frequency modulation of a combined cycle unit, so as to solve at least one of the above-mentioned problems.
According to a first aspect of the present invention, there is provided a primary frequency control method for a combined cycle plant, the method comprising: receiving and acquiring gas turbine operation information and a gas turbine load preset value, wherein the gas turbine operation information comprises: the method comprises the following steps of obtaining gas turbine rotating speed information, gas turbine operation mode information and gas turbine load information, wherein the gas turbine operation mode information comprises the following steps: a rotation speed control mode and a load control mode; performing virtual compensation processing on the gas turbine rotating speed information and the gas turbine load information according to the gas turbine operating mode information and the gas turbine load preset value to generate a frequency modulation load component and a feedforward frequency modulation flow component; generating a new gas turbine load preset value according to the frequency modulation load component, the gas turbine load preset value and the gas turbine load information; carrying out proportional integral operation on the new load preset value of the combustion engine; and performing primary frequency modulation processing on the combined cycle unit according to the load value of the gas turbine after proportional-integral operation and the feedforward frequency modulation flow component.
According to a second aspect of the present invention, there is provided a primary frequency modulation control apparatus of a combined cycle plant, the apparatus comprising: the information receiving unit is used for receiving and acquiring the operation information of the combustion engine and the load preset value of the combustion engine, and the operation information of the combustion engine comprises the following components: the method comprises the following steps of obtaining gas turbine rotating speed information, gas turbine operation mode information and gas turbine load information, wherein the gas turbine operation mode information comprises the following steps: a rotation speed control mode and a load control mode; the virtual compensation operation unit is used for carrying out virtual compensation processing on the gas turbine rotating speed information and the gas turbine load information according to the gas turbine running mode information and the gas turbine load preset value to generate a frequency modulation load component and a feedforward frequency modulation flow component; a combustion engine load preset value generation unit for generating a new combustion engine load preset value according to the frequency modulation load component, the combustion engine load preset value and the combustion engine load information; a proportional integral operation unit for performing proportional integral operation on the new predetermined value of the load of the combustion engine; and the frequency modulation processing unit is used for carrying out primary frequency modulation processing on the combined cycle unit according to the load value of the gas turbine after proportional-integral operation and the feed-forward frequency modulation flow component.
According to a third aspect of the present invention, there is provided an electronic device, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above-mentioned primary frequency modulation control method of the combined cycle plant when executing the program.
According to a fourth aspect of the present invention, there is provided a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the above-described primary frequency control method of a combined cycle plant.
According to the technical scheme, the method comprises the steps of performing virtual compensation processing on the rotation speed information and the load information of the combustion engine according to the acquired running mode information and the load preset value of the combustion engine to generate a frequency modulation load component and a feed-forward frequency modulation flow component, then generating a new load preset value of the combustion engine according to the frequency modulation load component, the load preset value of the combustion engine and the load information of the combustion engine, and then the proportional integral operation is carried out on the combined cycle unit, the load value of the combustion engine and the feedforward frequency modulation flow component after the proportional integral operation are carried out on the combined cycle unit for primary frequency modulation, because the virtual compensation processing is carried out according to the operation mode information of the gas turbine, the fixed unequal rate parameters under different frequency differences of the original whole-course load section can be corrected to be adapted to the frequency modulation characteristic of the variable parameters of the full load section, particularly small frequency difference disturbance, and the precision and the rapidity of the primary frequency modulation action are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a prior art gas turbine primary frequency control;
FIG. 2 is a flow chart of a method of primary frequency modulation control of a combined cycle plant according to an embodiment of the present invention;
fig. 3 is a block diagram showing a configuration of a primary frequency modulation control apparatus of a combined cycle plant according to an embodiment of the present invention;
fig. 4 is a detailed structural block diagram of a primary frequency modulation control device of a combined cycle plant according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a gas-steam combined cycle plant according to an embodiment of the present invention;
FIG. 6 is a graph of frequency modulated load after slip correction according to an embodiment of the present invention;
FIG. 7 is a graph of frequency modulated load before and after slip correction according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of an electronic device according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Although the frequency modulation loop in the prior art enables the combined cycle unit to have a basic primary frequency modulation function, the primary frequency modulation performance of a full load section, particularly under a small frequency difference, cannot be ensured, and the requirement of a power grid on the primary frequency modulation rapidity of the unit cannot be met by a single outer ring frequency modulation load increment. Based on the technical scheme, the embodiment of the invention provides a primary frequency modulation control scheme of the combined cycle unit, which can ensure combustion stability and response rapidity. Embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Fig. 2 is a flowchart of a primary frequency modulation control method of a combined cycle plant according to an embodiment of the present invention, as shown in fig. 2, the method includes:
102, performing virtual compensation processing on the combustion engine rotation speed information and the combustion engine load information according to the combustion engine operation mode information and the combustion engine load preset value to generate a frequency modulation load component and a feedforward frequency modulation flow component;
103, generating a new gas turbine load preset value according to the frequency modulation load component, the gas turbine load preset value and the gas turbine load information;
104, performing Proportional Integral (PI) operation on the new preset value of the load of the combustion engine;
and 105, performing primary frequency modulation processing on the combined cycle unit according to the load value of the combustion engine after proportional-integral operation and the feed-forward frequency modulation flow component.
The method comprises the steps of performing virtual compensation processing on gas turbine rotating speed information and gas turbine load information according to acquired gas turbine operating mode information and gas turbine load preset values to generate frequency modulation load components and feedforward frequency modulation flow components, then generating new gas turbine load preset values according to the frequency modulation load components, the gas turbine load preset values and the gas turbine load information, performing proportional integral operation on the new gas turbine load preset values, and then performing primary frequency modulation processing on a combined cycle unit on the gas turbine load values and the feedforward frequency modulation flow components after the proportional integral operation.
In a specific implementation process, when the information of the operation mode of the combustion engine is in a load control (PR) mode, a slip correction operation can be performed on the information of the rotation speed of the combustion engine and the information of the load of the combustion engine according to the predetermined value of the load of the combustion engine to realize virtual compensation and generate a frequency modulation load component and a feed-forward frequency modulation flow component.
Then, carrying out superposition processing according to the frequency modulation load component and the predetermined value of the load of the combustion engine; and generating a new preset value of the engine load according to the deviation of the value after the superposition processing and the engine load information.
After Proportional Integral (PI) operation is carried out on the new combustion engine load preset value, the combustion engine load value after the PI operation and the feedforward frequency modulation flow component are added to generate a combustion engine frequency modulation value; and carrying out dynamic high-limit processing on the combustion engine frequency modulation value according to the dynamic high-limit value, and carrying out primary frequency modulation processing on the combined cycle unit according to the value output after the dynamic high-limit processing.
Specifically, when the frequency modulation value of the combustion engine is larger than the dynamic high limit value, the dynamic high limit value is output; and when the combustion engine frequency modulation value is smaller than or equal to the dynamic high limit value, outputting the combustion engine frequency modulation value. The dynamic high limit value here is limited by the operating mode of the unit, the IGV opening and the ambient temperature.
An embodiment of the present invention further provides a primary frequency modulation control apparatus of a combined cycle unit, which is preferably used to implement the above method, as shown in fig. 3, and includes:
an information receiving unit 21 configured to receive and acquire engine operation information and an engine load predetermined value, the engine operation information including: the method comprises the following steps of obtaining gas turbine rotating speed information, gas turbine operation mode information and gas turbine load information, wherein the gas turbine operation mode information comprises the following steps: a rotation speed control mode and a load control mode;
the virtual compensation operation unit 22 is used for performing virtual compensation processing on the combustion engine rotating speed information and the combustion engine load information according to the combustion engine running mode information and the combustion engine load preset value to generate a frequency modulation load component and a feedforward frequency modulation flow component;
a combustion engine load predetermined value generation unit 23 configured to generate a new combustion engine load predetermined value based on the frequency modulation load component, the combustion engine load predetermined value, and the combustion engine load information;
a proportional-integral operation unit 24 for performing a proportional-integral operation on the new predetermined value of the load of the combustion engine;
and the frequency modulation processing unit 25 is used for carrying out primary frequency modulation processing on the combined cycle unit according to the combustion engine load value after proportional-integral operation and the feed-forward frequency modulation flow component.
The virtual compensation operation unit 22 performs virtual compensation processing on the gas turbine rotation speed information and the gas turbine load information according to the gas turbine operation mode information and the gas turbine load preset value acquired by the information receiving unit 21 to generate a frequency modulation load component and a feed-forward frequency modulation flow component, the gas turbine load preset value generation unit 23 generates a new gas turbine load preset value according to the frequency modulation load component, the gas turbine load preset value and the gas turbine load information, the proportional integral operation unit 24 performs proportional integral operation on the new gas turbine load preset value, the frequency modulation processing unit 25 performs primary frequency modulation processing on the gas turbine load value and the feed-forward frequency modulation flow component after the proportional integral operation on the combined cycle unit, and due to the fact that the virtual compensation processing is performed according to the gas turbine operation mode information, fixed unequal rate parameters under different frequency differences of an original whole load section can be corrected to be adapted to the whole load section, especially the variable parameter frequency modulation characteristic of small frequency difference disturbance, the precision and the rapidity of primary frequency modulation action are improved.
In practical operation, when the information on the engine operating mode is the load control mode, the virtual compensation operating unit 22 is specifically configured to: and performing slip correction operation on the rotating speed information and the load information of the combustion engine according to the load preset value of the combustion engine so as to realize virtual compensation processing and generate a frequency modulation load component and a feedforward frequency modulation flow component.
Specifically, the engine load predetermined value generation unit 23 includes: the superposition processing module is used for carrying out superposition processing according to the frequency modulation load component and the gas turbine load preset value; and the combustion engine load preset value generation module is used for generating a new combustion engine load preset value according to the deviation of the value after the superposition processing and the combustion engine load information.
In a specific implementation process, as shown in fig. 4, the apparatus further includes: a combustion engine frequency modulation value generation unit 26 and an upper limit processing unit 27, wherein:
a combustion engine frequency modulation value generation unit 26, configured to perform an addition operation on the combustion engine load value after the proportional integral operation and the feed-forward frequency modulation flow component to generate a combustion engine frequency modulation value;
and the high limit processing unit 27 is used for performing dynamic high limit processing on the combustion engine frequency modulation value according to the dynamic high limit value. Specifically, when the engine frequency modulation value is greater than the dynamic high limit value, the high limit processing unit 27 outputs the dynamic high limit value; when the combustion engine frequency modulation value is smaller than or equal to the dynamic high limit value, the high limit processing unit 27 outputs the combustion engine frequency modulation value.
Then, the frequency modulation processing unit 25 performs primary frequency modulation processing on the combined cycle unit according to the output value of the upper limit processing unit 27.
For a better understanding of the embodiments of the present invention, they are described below based on a gas-steam combined cycle plant configuration shown in fig. 5.
As shown in fig. 5, compared with the existing gas turbine structure shown in fig. 1, the gas-steam combined cycle unit adds a virtual compensation calculation module based on a gas turbine control method, and embeds the virtual compensation calculation module into an original control system to improve the primary frequency modulation performance.
As shown in fig. 5, the virtual compensation calculating module receives a GAS SPEED signal (GAS SPEED), a mode discriminating signal of a SPEED LOAD controller (NPR) of the GAS turbine, actual LOAD information (ACT LOAD) of the GAS turbine, and a LOAD set value of the GAS turbine, and after these data enter the virtual compensation calculating module and are calculated, two control signals are output, namely a frequency modulation LOAD calculation component Δ P (megawatt, MW) and a feedforward frequency modulation flow component Δ CSO (%), wherein [% represents a unit after per unit, and a unit per unit of a number of 0-1.
In actual operation, the specific operation process of the virtual compensation calculation module includes: 1. judging the load section where the actual load of the gas turbine is located according to the load set value of the gas turbine, and selecting corresponding compensation functions according to the frequency modulation capability characteristics of different load sections; 2. judging the slip size through a rotating speed signal of the gas turbine, and executing corresponding function correction operation according to different slip sections; 3. the correction coefficient is adjusted according to the mode discrimination signal. Then, the Δ P and Δ CSO are compensated by three different sets of functions (fitted according to the existing empirical data) according to a preset weighting proportion, wherein in actual operation, the mode discrimination signal only affects the function for obtaining Δ CSO.
By introducing the virtual compensation calculation module and a plurality of input reference quantities, a proper variable parameter function can be judged and selected according to the input parameters, so that the fixed unequal rate parameters of the original whole-course load section under different frequency differences can be corrected to be suitable for the full load section.
In the embodiment of the invention, the virtual compensation calculation module carries out the calculation of a frequency modulation load calculation component delta P (MW) and a feedforward frequency modulation flow component delta CSO (%) according to the received NPR mode discrimination signal. When the internal combustion engine is operated in the NR mode (i.e., the rotational speed control mode), the rotational speed load controller itself has a primary frequency modulation function, and therefore, the calculated feed-forward frequency modulation flow component Δ CSO (%) is attenuated accordingly. Specifically, in the speed control mode, the speed load controller performs a part of feedforward function, so that the virtual compensation calculation module can calculate the virtual compensation calculation module to weaken the virtual compensation calculation module proportionally, for example, according to the slip multiplied by a coefficient less than 1.
When the combustion engine runs in a PR mode (namely a load control mode), a frequency modulation load calculation component delta P (MW) and a feed-forward frequency modulation flow component delta CSO (%) are obtained according to an algorithm after slip correction, and the actual implementation is as shown in FIG. 6, wherein FIG. 6 is a corresponding relation between slip and frequency modulation load after virtual compensation, and the corresponding relation is not a simple linear corresponding relation any more, but has different slopes according to the difference of slip.
The slip correction here may be, for example, that the rotation speed received by the virtual compensation calculation module is x1, and the rotation speed is judged to belong to a predefined small slip range through a function, then x1 × 1.3 is x2, x2 may be used as a corrected value, where the multiplication operation and the coefficient 1.3 thereof are merely exemplary, and the actual operation may be a multivariate optimization algorithm, or may be an offset operation as follows.
The virtual compensation calculation module performs slip correction without changing the original frequency modulation characteristics of the unit, and improves the primary frequency modulation action amount and the rapidity by adding a bias method, and the effect calculated by the correction module is shown in fig. 7.
Then, the frequency modulation load component delta P is superposed with the initial value of the gas turbine of the unit to be used as a new gas turbine load set value, and the deviation of the gas turbine load component delta P and the actual load of the gas turbine enters a rotating speed load controller (NPR) to carry out Proportional Integral (PI) closed-loop operation; the feedforward frequency modulation flow component delta CSO is not limited by the speed of the PI operation controller and is added to the output end of the rotating speed load controller as a quick response link, and the value after the delta CSO and the PI operation are superposed to form the combustion engine frequency modulation value.
And carrying out dynamic high-limit processing on the combustion engine frequency modulation value, outputting the combustion engine frequency modulation value when the combustion engine frequency modulation value is smaller than the dynamic high-limit value, and otherwise, limiting the output and changing the output value into the dynamic high-limit value. This dynamic high limit is limited by the operating mode of the unit, the IGV opening and the ambient temperature. And then, performing primary frequency modulation processing on the combustion engine according to the dynamic high-limit output value.
From the above description, the virtual compensation calculation module performs virtual compensation processing according to the rotation speed signal of the gas turbine, the NPR mode discrimination signal, the actual load information of the gas turbine and the load set value of the gas turbine, and embeds the obtained optimized frequency modulation load and frequency modulation feedforward increment into the original unit control system to optimize the primary frequency modulation performance of the unit.
FIG. 8 is a schematic diagram of an electronic device according to an embodiment of the invention. The electronic device shown in fig. 8 is a general-purpose data processing apparatus comprising a general-purpose computer hardware structure including at least a processor 801 and a memory 802. The processor 801 and the memory 802 are connected by a bus 803. The memory 802 is adapted to store one or more instructions or programs that are executable by the processor 801. The one or more instructions or programs are executed by the processor 801 to implement the steps of the above-described primary control method of the combined cycle plant.
The processor 801 may be a stand-alone microprocessor or a collection of one or more microprocessors. Thus, the processor 801 implements the processing of data and the control of other devices by executing commands stored in the memory 802 to thereby execute the method flows of embodiments of the present invention as described above. The bus 803 connects the above components together, and also connects the above components to a display controller 804 and a display device and an input/output (I/O) device 805. Input/output (I/O) devices 805 may be a mouse, keyboard, modem, network interface, touch input device, motion sensing input device, printer, and other devices known in the art. Typically, input/output (I/O) devices 805 are connected to the system through an input/output (I/O) controller 806.
The memory 802 may store, among other things, software components such as an operating system, communication modules, interaction modules, and application programs. Each of the modules and applications described above corresponds to a set of executable program instructions that perform one or more functions and methods described in embodiments of the invention.
The embodiment of the invention also provides a computer readable storage medium, on which a computer program is stored, and the computer program is executed by a processor to implement the steps of the primary frequency modulation control method of the combined cycle unit.
In summary, in the embodiments of the present invention, through a virtual compensation algorithm, an unequal rate parameter fixed under different frequency differences of an original full-range load segment is modified to adapt to a full-load segment, especially a variable parameter frequency modulation characteristic of small frequency difference disturbance, so as to achieve the purpose of improving the accuracy and rapidity of a primary frequency modulation motion amount; by introducing a mode discrimination signal of a rotating speed load control loop of the combustion engine, the universality of the same set of primary frequency modulation control strategy under various working conditions can be realized; the feedforward frequency modulation flow component delta CSO is used as a quick response link and is added to the output end of an NPR operation block of the rotating speed load controller without being limited by the speed of a PI operation controller; and obtaining theoretical frequency modulation load variation through the actual rotating speed of the gas turbine, taking a value accumulated with the gas turbine load setting signal as the theoretical load variation, and comparing the theoretical load variation with the actual load variation of the gas turbine so as to roll and correct the virtual slip correction parameter by a module algorithm. That is, the comparison between the theoretical value and the actual value is performed to obtain the output value, which is reflected as the change of combustion to achieve the effect that the actual value is equal to the theoretical value, but the process is likely to be extremely long, and when the virtual compensation calculation module finds that the time period is longer than a certain time period or the deviation between the actual value and the theoretical value is large, the virtual compensation calculation module automatically modifies and strengthens the internal parameters to accelerate the achievement of the equivalence between the actual value and the theoretical value.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the hardware + program class embodiment, since it is substantially similar to the method embodiment, the description is simple, and the relevant points can be referred to the partial description of the method embodiment.
The foregoing description has been directed to specific embodiments of this disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
Although the present application provides method steps as described in an embodiment or flowchart, additional or fewer steps may be included based on conventional or non-inventive efforts. The order of steps recited in the embodiments is merely one manner of performing the steps in a multitude of orders and does not represent the only order of execution. When an actual apparatus or client product executes, it may execute sequentially or in parallel (e.g., in the context of parallel processors or multi-threaded processing) according to the embodiments or methods shown in the figures.
The systems, devices, modules or units illustrated in the above embodiments may be implemented by a computer chip or an entity, or by a product with certain functions. One typical implementation device is a computer. In particular, the computer may be, for example, a personal computer, a laptop computer, a vehicle-mounted human-computer interaction device, a cellular telephone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.
The terms "comprises," "comprising," or any other variation thereof, in the embodiments of this specification are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the presence of additional identical or equivalent elements in a process, method, article, or apparatus that comprises the recited elements is not excluded.
For convenience of description, the above devices are described as being divided into various modules by functions, and are described separately. Of course, in implementing the embodiments of the present description, the functions of each module may be implemented in one or more software and/or hardware, or a module implementing the same function may be implemented by a combination of multiple sub-modules or sub-units, and the like. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
Those skilled in the art will also appreciate that, in addition to implementing the controller as pure computer readable program code, the same functionality can be implemented by logically programming method steps such that the controller is in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like. Such a controller may therefore be considered as a hardware component, and the means included therein for performing the various functions may also be considered as a structure within the hardware component. Or even means for performing the functions may be regarded as being both a software module for performing the method and a structure within a hardware component.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may 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, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
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 such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, 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 technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
As will be appreciated by one skilled in the art, embodiments of the present description may be provided as a method, system, or computer program product. Accordingly, embodiments of the present description may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present description may 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, and so forth) having computer-usable program code embodied therein.
The embodiments of this specification may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The described embodiments may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the specification. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
The above description is only an example of the embodiments of the present disclosure, and is not intended to limit the embodiments of the present disclosure. Various modifications and variations to the embodiments described herein will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present specification should be included in the scope of the claims of the embodiments of the present specification.
Claims (9)
1. A primary frequency modulation control method of a combined cycle unit is characterized by comprising the following steps:
receiving and acquiring gas turbine operation information and a gas turbine load preset value, wherein the gas turbine operation information comprises: the method comprises the following steps of obtaining gas turbine rotating speed information, gas turbine operation mode information and gas turbine load information, wherein the gas turbine operation mode information comprises the following steps: a rotation speed control mode and a load control mode;
performing virtual compensation processing on the gas turbine rotating speed information and the gas turbine load information according to the gas turbine operating mode information and the gas turbine load preset value to generate a frequency modulation load component and a feedforward frequency modulation flow component;
generating a new gas turbine load preset value according to the frequency modulation load component, the gas turbine load preset value and the gas turbine load information;
carrying out proportional integral operation on the new load preset value of the combustion engine;
performing primary frequency modulation processing on the combined cycle unit according to the load value of the gas turbine after proportional-integral operation and the feedforward frequency modulation flow component;
the virtual compensation processing of the combustion engine rotation speed information and the combustion engine load information according to the combustion engine operation mode information and the combustion engine load preset value comprises the following steps:
determining a load range to which the load information of the combustion engine belongs according to the predetermined value of the load of the combustion engine, wherein different load ranges correspond to different compensation operations;
determining a rotating speed range to which the rotating speed information of the gas turbine belongs according to the rotating speed information of the gas turbine, wherein different rotating speed ranges correspond to different correction operations;
and performing compensation correction operation on the combustion engine rotating speed information and the combustion engine load information according to the combustion engine running mode information, the load range to which the determined combustion engine load information belongs and the rotating speed range to which the determined combustion engine rotating speed information belongs.
2. The primary frequency modulation control method of the combined cycle unit according to claim 1, wherein before the primary frequency modulation processing is performed on the combined cycle unit according to the load value of the combustion engine after the proportional-integral operation and the feed-forward frequency modulation flow component, the method further comprises:
performing addition operation on the combustion engine load value after proportional integral operation and the feedforward frequency modulation flow component to generate a combustion engine frequency modulation value;
carrying out dynamic high-limit processing on the combustion engine frequency modulation value according to the dynamic high-limit value;
the dynamic high-limit processing of the combustion engine frequency modulation value according to the dynamic high-limit value comprises the following steps:
when the frequency modulation value of the gas turbine is larger than the dynamic high limit value, outputting the dynamic high limit value;
and when the combustion engine frequency modulation value is smaller than or equal to the dynamic high limit value, outputting the combustion engine frequency modulation value.
3. A primary frequency modulation control method of a combined cycle plant according to claim 1, wherein generating a new combustion engine load predetermined value from the frequency modulation load component, the combustion engine load predetermined value, and the combustion engine load information comprises:
performing superposition processing according to the frequency modulation load component and the gas turbine load preset value;
and generating a new preset value of the engine load according to the deviation of the value after the superposition processing and the engine load information.
4. A primary frequency modulation control apparatus for a combined cycle plant, the apparatus comprising:
the information receiving unit is used for receiving and acquiring the operation information of the combustion engine and the load preset value of the combustion engine, and the operation information of the combustion engine comprises the following components: the method comprises the following steps of obtaining gas turbine rotating speed information, gas turbine operation mode information and gas turbine load information, wherein the gas turbine operation mode information comprises the following steps: a rotation speed control mode and a load control mode;
the virtual compensation operation unit is used for carrying out virtual compensation processing on the gas turbine rotating speed information and the gas turbine load information according to the gas turbine running mode information and the gas turbine load preset value to generate a frequency modulation load component and a feedforward frequency modulation flow component;
a combustion engine load preset value generation unit for generating a new combustion engine load preset value according to the frequency modulation load component, the combustion engine load preset value and the combustion engine load information;
a proportional integral operation unit for performing proportional integral operation on the new predetermined value of the load of the combustion engine;
the frequency modulation processing unit is used for carrying out primary frequency modulation processing on the combined cycle unit according to the gas turbine load value after proportional-integral operation and the feedforward frequency modulation flow component;
wherein the virtual compensation operation unit is specifically configured to: determining a load range to which the load information of the combustion engine belongs according to the predetermined value of the load of the combustion engine, wherein different load ranges correspond to different compensation operations; determining a rotating speed range to which the rotating speed information of the gas turbine belongs according to the rotating speed information of the gas turbine, wherein different rotating speed ranges correspond to different correction operations; and performing compensation correction operation on the combustion engine rotating speed information and the combustion engine load information according to the combustion engine running mode information, the load range to which the determined combustion engine load information belongs and the rotating speed range to which the determined combustion engine rotating speed information belongs.
5. A primary frequency modulation control device of a combined cycle plant according to claim 4, wherein when the combustion engine operation mode information is a load control mode, the virtual compensation operation unit is specifically configured to:
and performing slip correction operation on the combustion engine rotating speed information and the combustion engine load information according to the combustion engine load preset value.
6. A primary frequency modulation control apparatus of a combined cycle plant according to claim 4, characterized in that said apparatus further comprises:
the gas turbine frequency modulation value generating unit is used for executing addition operation on the gas turbine load value after proportional integral operation and the feedforward frequency modulation flow component to generate a gas turbine frequency modulation value;
the high limit processing unit is used for carrying out dynamic high limit processing on the combustion engine frequency modulation value according to a dynamic high limit value;
wherein the high-limit processing unit is specifically configured to: when the frequency modulation value of the gas turbine is larger than the dynamic high limit value, outputting the dynamic high limit value; and when the combustion engine frequency modulation value is smaller than or equal to the dynamic high limit value, outputting the combustion engine frequency modulation value.
7. A primary frequency modulation control apparatus of a combined cycle plant according to claim 4, wherein the combustion engine load predetermined value generating unit includes:
the superposition processing module is used for carrying out superposition processing according to the frequency modulation load component and the gas turbine load preset value;
and the combustion engine load preset value generating module is used for generating a new combustion engine load preset value according to the deviation of the value after the superposition processing and the combustion engine load information.
8. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the program implements the steps of the primary tuning control method of a combined cycle plant according to any of claims 1 to 3.
9. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of a method for primary frequency control of a combined cycle plant according to any one of claims 1 to 3.
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