CN116906143A - Method for determining heat supply operation condition of combined cycle unit of gas turbine - Google Patents
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Abstract
The invention discloses a method for determining the heat supply operation condition of a combined cycle unit of a gas turbine, which comprises the steps of firstly, obtaining the actual steam extraction quantity of the gas turbine, and obtaining the known steam extraction condition line and the minimum steam extraction quantity line of the gas turbine; determining the high-pressure air intake and the minimum power of the steam turbine under the obtained actual steam extraction of the steam turbine according to the obtained known steam extraction working condition line and the minimum steam extraction line; acquiring standard condition gas inflow of the gas turbine and minimum power generation according to the high-pressure gas inflow of the steam turbine; and obtaining the minimum power generation power of the gas turbine combined cycle unit under the obtained actual steam extraction amount of the steam turbine according to the minimum power generation power of the steam turbine and the minimum power generation power of the gas turbine, and finishing the determination of the heat supply operation working condition of the gas turbine combined cycle unit.
Description
Technical Field
The invention belongs to the technical field of strategies and methods for optimizing operation of a gas turbine, and relates to a method for determining heat supply operation conditions of a combined cycle unit of the gas turbine.
Background
The gas turbine combined cycle unit has gradually become an important power source side energy form in the domestic power generation field due to the advantages of high energy utilization rate, convenience in peak shaving, environmental friendliness, small occupied area and the like. At present, most gas turbine units bear urban heating tasks and increase speed faster.
The price of natural gas is limited, and the power generation of the existing gas turbine combined cycle unit is in a loss state, so that the gas turbine combined cycle unit is coordinated with the power grid dispatching as much as possible to reduce the power generation capacity while bearing the heat supply task. How to determine the working condition of the minimum power generation power of the unit capable of maintaining the heat supply under a certain heat supply becomes a concern of operators, but related strategies and methods at present are still in a blank stage, and no effective solution exists.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for determining the heating operation condition of a gas turbine combined cycle unit, so that the technical problem that the minimum power generation power of the heating quantity can not be effectively determined when the heating quantity is fixed in the prior art is effectively solved.
The invention is realized by the following technical scheme:
a method for determining the heat supply operation condition of a combined cycle unit of a gas turbine comprises the following steps:
s1: acquiring the actual steam extraction amount of the steam turbine, a known steam extraction working condition line of the steam turbine and a minimum steam extraction amount line;
s2: determining the high-pressure air intake and the minimum power generation of the turbine under the condition of the obtained actual steam extraction of the turbine according to the obtained known steam extraction working condition line and the minimum steam extraction line of the turbine;
s3: acquiring standard condition gas inflow of the gas turbine and minimum power generation according to the high-pressure gas inflow of the steam turbine;
s4: and obtaining the minimum power generation of the gas turbine combined cycle unit under the obtained actual steam extraction amount of the steam turbine according to the minimum power generation of the steam turbine and the minimum power generation of the gas turbine, and completing the determination of the heat supply operation condition of the gas turbine combined cycle unit by combining the standard condition gas air inflow of the gas turbine.
Preferably, in step S1, a known extraction condition line and a minimum exhaust steam quantity line of the steam turbine are obtained through a thermal condition diagram of the steam turbine.
Preferably, the known steam extraction working condition lines of the steam turbine comprise pure condensation working condition lines and working condition lines under different steam extraction flows.
Preferably, in step S3, the standard condition gas intake air amount of the gas turbine is obtained through the standard condition gas intake air amount model of the gas turbine combined cycle unit.
Preferably, the standard condition gas air inflow model is obtained by performing first training on the BP neural network model, and in the first training process, the high-pressure air inflow of the steam turbine is input, and the standard condition gas air inflow of the gas turbine is output.
Preferably, in step S3, the minimum power of the gas turbine is obtained through a gas turbine power model of the gas turbine combined cycle unit.
Preferably, the gas turbine power generation model is obtained by performing second training on a BP neural network model; in the second training process, the high-pressure steam inlet amount, the rotating speed of the gas turbine, the standard condition gas inlet amount, the opening degree of the IGV valve, the gas temperature and the air temperature are input, and the output is the power generation power of the gas turbine.
A system for determining a heating operating condition of a combined cycle unit of a gas turbine, comprising:
the data acquisition module is used for acquiring the actual steam extraction amount of the steam turbine and acquiring a known steam extraction working condition line and a minimum steam extraction amount line of the steam turbine;
the first data processing module is used for determining the high-pressure air intake and the minimum power generation of the steam turbine under the condition of the obtained actual steam extraction of the steam turbine according to the obtained known steam extraction working condition line and the minimum steam extraction line of the steam turbine;
the second data processing module is used for acquiring the standard gas inflow and the minimum power of the gas turbine according to the high-pressure gas inflow of the steam turbine;
the third data processing module is used for acquiring the minimum power generation of the gas turbine combined cycle unit under the acquired actual steam extraction amount of the steam turbine according to the minimum power generation of the steam turbine and the minimum power generation of the gas turbine;
the result output module is used for outputting the minimum power generation of the gas turbine combined cycle unit under the obtained actual steam extraction quantity of the steam turbine and the standard condition gas air inflow of the gas turbine, and determining the heat supply operation working condition of the gas turbine combined cycle unit.
Terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the above method when executing the computer program.
A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the above method.
Compared with the prior art, the invention has the following beneficial technical effects:
a method for determining the heat supply operation condition of a gas turbine combined cycle unit includes such steps as determining the high-pressure air inlet and minimum power of a turbine under the condition of the actual steam extraction of the turbine by existing steam extraction condition lines and minimum steam exhaust quantity lines, obtaining the standard gas air inlet and minimum power of the gas turbine by the high-pressure air inlet of the turbine, obtaining the minimum power of the gas turbine under the condition of the actual steam extraction of the turbine by the minimum power of the gas turbine, and determining the heat supply operation condition of the gas turbine combined cycle unit by the standard gas air inlet, the minimum power of the turbine and the minimum power of the gas turbine. According to the technology, the model relation between the generated power and the existing data is established by utilizing the existing data, so that the technical problem that the minimum generated power of the heat supply can not be effectively determined when the heat supply is fixed in the prior art is effectively solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a method for determining the heating operation condition of a combined cycle unit of a gas turbine;
FIG. 2 is a schematic diagram of a system for determining a heating operation condition of a combined cycle unit of a gas turbine according to the present invention.
FIG. 3 is a thermal operating mode diagram of a steam turbine in embodiment 2 of the present invention;
FIG. 4 is a flow chart for determining the heating operation condition of the combined cycle unit of the gas turbine in embodiment 2 of the invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the embodiments of the present invention, it should be noted that, if the terms "upper," "lower," "horizontal," "inner," and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or the azimuth or the positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present invention and simplifying the description, and does not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Furthermore, the term "horizontal" if present does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The invention is described in further detail below with reference to the attached drawing figures:
example 1
As shown in FIG. 1, the method for determining the heat supply operation condition of the combined cycle unit of the gas turbine comprises the following steps:
s1: acquiring the actual steam extraction amount of the steam turbine, and acquiring a known steam extraction working condition line and a minimum steam extraction amount line of the steam turbine; specifically, a known steam extraction working condition line and a minimum steam extraction quantity line of the steam turbine are obtained through a thermal working condition diagram of the steam turbine, wherein the known steam extraction working condition line comprises a pure condensation working condition line and working condition lines under different steam extraction flows, a plurality of working condition lines under the steam extraction flows set by different equipment manufacturers can be included, and the working condition lines can comprise 40t/h, 80t/h, 100t/h,120t/h and the like, and meanwhile, the settings of different equipment manufacturers can also be different.
S2: determining the high-pressure air intake and the minimum power generation of the turbine under the condition of the obtained actual steam extraction of the turbine according to the obtained known steam extraction working condition line and the minimum steam extraction line of the turbine;
s3: acquiring standard condition gas inflow of the gas turbine and minimum power generation according to the high-pressure gas inflow of the steam turbine;
specifically, the standard condition gas air inflow and the minimum power generation of the gas turbine are respectively obtained through a standard condition gas air inflow model and a gas turbine power generation power model, and the standard condition gas air inflow model and the gas turbine power generation power model are obtained through training a BP neural network model;
when the standard condition gas inflow model is obtained, the BP neural network model is input into the high-pressure inflow of the steam turbine, and the BP neural network model is output into the standard condition gas inflow of the gas turbine;
when the power generation power model of the gas turbine is obtained, the BP neural network model is input with high-pressure steam inlet quantity, gas turbine rotating speed, standard gas inlet quantity, IGV valve opening degree, gas temperature and air temperature, and output with the power generation power of the gas turbine.
The high-pressure steam inlet quantity, the standard gas inlet quantity, the high-pressure steam inlet quantity, the gas turbine rotating speed, the standard gas inlet quantity, the IGV valve opening, the gas temperature, the air temperature and the turbine power generation power of the turbine for training the BP neural network model are all derived from the equipment operation historical data.
S4: and obtaining the minimum power generation of the gas turbine combined cycle unit under the obtained actual steam extraction amount of the steam turbine according to the minimum power generation of the steam turbine and the minimum power generation of the gas turbine, and completing the determination of the heat supply operation condition of the gas turbine combined cycle unit by combining the standard condition gas air inflow of the gas turbine.
A method for determining the heat supply operation condition of a gas turbine combined cycle unit includes such steps as determining the high-pressure air inlet and minimum power of a turbine under the condition of the actual steam extraction of the turbine by existing steam extraction condition lines and minimum steam exhaust quantity lines, obtaining the standard gas air inlet and minimum power of the gas turbine by the high-pressure air inlet of the turbine, obtaining the minimum power of the gas turbine under the condition of the actual steam extraction of the turbine by the minimum power of the gas turbine, and determining the heat supply operation condition of the gas turbine combined cycle unit by the standard gas air inlet, the minimum power of the turbine and the minimum power of the gas turbine. According to the technology, the model relation between the generated power and the existing data is established by utilizing the existing data, so that the technical problem that the minimum generated power of the heat supply can not be effectively determined when the heat supply is fixed in the prior art is effectively solved. In addition, a gas turbine model based on a BP neural network is provided, and the relation between the power generation power of the gas turbine and the influence factors of the power generation power can be accurately depicted.
Further, as shown in fig. 2, the invention also discloses a system for determining the heating operation condition of the combined cycle unit of the gas turbine, which comprises:
the data acquisition module is used for acquiring the actual steam extraction amount of the steam turbine and acquiring a known steam extraction working condition line and a minimum steam extraction amount line of the steam turbine;
the first data processing module is used for determining the high-pressure air intake and the minimum power generation of the steam turbine under the condition of the obtained actual steam extraction of the steam turbine according to the obtained known steam extraction working condition line and the minimum steam extraction line of the steam turbine;
the second data processing module is used for acquiring the standard gas inflow and the minimum power of the gas turbine according to the high-pressure gas inflow of the steam turbine;
the third data processing module is used for acquiring the minimum power generation of the gas turbine combined cycle unit under the acquired actual steam extraction amount of the steam turbine according to the minimum power generation of the steam turbine and the minimum power generation of the gas turbine;
the result output module is used for outputting the minimum power generation of the gas turbine combined cycle unit under the obtained actual steam extraction quantity of the steam turbine and the standard condition gas air inflow of the gas turbine, and determining the heat supply operation working condition of the gas turbine combined cycle unit.
Example 2
Further, the technical scheme of the present invention will be explained again with reference to fig. 3 and example 2.
A method for determining the heat supply operation condition of a combined cycle unit of a gas turbine comprises the following steps:
s1: acquiring the actual steam extraction amount of the steam turbine, which is 105t/h, and acquiring the known steam extraction working condition line and the minimum steam extraction amount line of the steam turbine by utilizing a thermal working condition diagram of the steam turbine;
s2: determining the high-pressure air intake and the minimum power generation of the turbine under the condition of the obtained actual steam extraction of the turbine according to the obtained known steam extraction working condition line and the minimum steam extraction line of the turbine;
specifically, the thermal Kuang Tu of the steam turbine is utilized to determine the minimum power generation working condition of the steam turbine according to the intersection point of the steam extraction working condition line and the minimum steam discharge quantity line.
As shown in fig. 4, taking an example of an actual operation condition diagram of the steam turbine, a line Gex is a minimum steam exhaust amount line of the steam turbine, gc is a steam extraction amount line of the steam turbine, an abscissa of fig. 4 is a steam inlet amount of the steam turbine, and an ordinate of fig. 4 is a power generation of the steam turbine. The method for determining the minimum generated power comprises the following steps:
(1) Determining the function expression of each working condition line:
minimum exhaust gas measurement line Gex: y= -0.0005x 2 +0.1541x+0.2922, x range (37.44, 137.80)
Pure condensing condition line AE: y= 0.3371x-3.09, x range (18.09, 195.15)
The extraction flow is 40t/h line BF: y=0.0003 x 2 +0.2986x-14.352, x range (73.92, 195.15)
Steam extraction flow 80t/h line CG: y=0.0003 x 2 +0.3064x-26.026, x range (109.44, 195.15)
Steam extraction flow 120t/h line DH: y=0.0004 x 2 +0.285x-34.929, x range (137.91, 195.15)
(2) Obtaining intersection points A, B, C, D of four known steam extraction working conditions and a minimum steam extraction line shown in fig. 4; the abscissa corresponding to the four A, B, C, D points is obtained by: 18.089 (corresponding to the pure condensation working condition line), 73.919 (corresponding to the extraction flow 40t/h line), 109.445 (corresponding to the extraction flow 80t/h line), 137.908 (corresponding to the extraction flow 120t/h line).
(3) Solving the abscissa of the intersection point of the actual steam extraction measuring line and the minimum steam extraction measuring line: reading heat supply steam extraction flow real-time data (the data source is a power plant sis system), if the actual steam extraction amount obtained in the step S1 is 105t/h, the method for obtaining the abscissa of the intersection point of the 105t/h steam extraction line and the minimum steam extraction line is as follows:
(4) Solving the ordinate of the intersection point of the actual steam extraction measuring line and the minimum steam extraction measuring line: the ordinate of the intersection point of the 105t/h steam extraction line and the minimum steam exhaust line is obtained by taking x (105) into a function expression y= -0.0005x of the minimum steam exhaust line 2 +0.1541x+0.2922, values are: -5.5125+16.1805+0.2922=10.96.
Namely, the high-pressure steam inlet G of the optimal working condition is obtained gy Minimum power P of turbine at 127.23t/h e The method comprises the following steps: 10.96MW.
The steps determine the high-pressure steam inlet quantity and the minimum power of the steam turbine under the specific working condition.
S3: acquiring standard condition gas inflow of the gas turbine and minimum power generation according to the high-pressure gas inflow of the steam turbine;
adopting an artificial intelligence (BP neural network) model to build a model to obtain standard condition gas inflow and power generated by a gas turbine, wherein the BP neural network is trained by adopting high-pressure inflow as input and standard condition gas inflow as output, so as to obtain a standard condition gas inflow model:
G g ＝f 1 (G gy )
wherein G is gy G is the high-pressure steam inlet quantity g The standard condition gas inflow;
the BP neural network is trained by adopting the power generated by the gas turbine as input of high-pressure gas inlet quantity, gas turbine rotating speed, standard condition gas inlet quantity, IGV valve opening, gas temperature and air temperature, and the power generated by the gas turbine is obtained by the power model:
P g ＝f 2 (G g ,N r ,G gy ,I p ,t g ,t a )
wherein G is gy Is at high pressureSteam inflow; n (N) r For gas turbine speed, G g For standard condition, the gas inflow is I p Is the opening degree of an IGV valve, t g Is the temperature of fuel gas, t a Is the air temperature, P g Generating power for the gas turbine.
Acquiring standard condition gas air inflow and minimum power generation of the gas turbine by using the two models;
s4: and obtaining the minimum power generation of the gas turbine combined cycle unit under the obtained actual steam extraction amount of the steam turbine according to the minimum power generation of the steam turbine and the minimum power generation of the gas turbine, and completing the determination of the heat supply operation condition of the gas turbine combined cycle unit by combining the standard condition gas air inflow of the gas turbine.
The standard gas inflow, the gas turbine power and the turbine power are obtained through the steps, and the minimum power generation working condition corresponding to a certain heat supply of the gas turbine combined cycle unit can be obtained.
The embodiment of the invention provides a schematic diagram of terminal equipment. The terminal device of this embodiment includes: a processor, a memory, and a computer program stored in the memory and executable on the processor. The steps of the various method embodiments described above are implemented when the processor executes the computer program. Alternatively, the processor may implement the functions of the modules/units in the above-described device embodiments when executing the computer program.
The computer program may be divided into one or more modules/units, which are stored in the memory and executed by the processor to accomplish the present invention.
The terminal equipment can be computing equipment such as a desktop computer, a notebook computer, a palm computer, a cloud server and the like. The terminal device may include, but is not limited to, a processor, a memory.
The processor may be a central processing unit (CentralProcessingUnit, CPU), but may also be other general purpose processors, digital signal processors (DigitalSignalProcessor, DSP), application specific integrated circuits (ApplicationSpecificIntegratedCircuit, ASIC), off-the-shelf programmable gate arrays (Field-ProgrammableGateArray, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like.
The memory may be used to store the computer program and/or module, and the processor may implement various functions of the terminal device by running or executing the computer program and/or module stored in the memory and invoking data stored in the memory.
The modules/units integrated in the terminal device may be stored in a computer readable storage medium if implemented in the form of software functional units and sold or used as separate products. Based on such understanding, the present invention may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer memory, a Read-only memory (ROM), a random access memory (RAM, randomAccessMemory), an electrical carrier signal, a telecommunication signal, a software distribution medium, and so forth. It should be noted that the computer readable medium contains content that can be appropriately scaled according to the requirements of jurisdictions in which such content is subject to legislation and patent practice, such as in certain jurisdictions in which such content is subject to legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunication signals.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The method for determining the heat supply operation condition of the combined cycle unit of the gas turbine is characterized by comprising the following steps of:
s1: acquiring the actual steam extraction amount of the steam turbine, a known steam extraction working condition line of the steam turbine and a minimum steam extraction amount line;
s2: determining the high-pressure air intake and the minimum power generation of the turbine under the condition of the obtained actual steam extraction of the turbine according to the obtained known steam extraction working condition line and the minimum steam extraction line of the turbine;
s3: acquiring standard condition gas inflow of the gas turbine and minimum power generation according to the high-pressure gas inflow of the steam turbine;
s4: and obtaining the minimum power generation of the gas turbine combined cycle unit under the obtained actual steam extraction amount of the steam turbine according to the minimum power generation of the steam turbine and the minimum power generation of the gas turbine, and completing the determination of the heat supply operation condition of the gas turbine combined cycle unit by combining the standard condition gas air inflow of the gas turbine.
2. The method for determining the heating operation condition of a combined cycle unit of a gas turbine according to claim 1, wherein in the step S1, a known extraction condition line and a minimum exhaust steam quantity line of the turbine are obtained through a thermal condition diagram of the turbine.
3. The method for determining the heating operation condition of a combined cycle unit of a gas turbine according to claim 1, wherein the known steam extraction condition lines of the gas turbine comprise pure condensation condition lines and condition lines under different steam extraction flows.
4. The method for determining a heating operation condition of a combined cycle unit of a gas turbine according to claim 1, wherein in step S3, a standard gas intake amount of the gas turbine is obtained through a standard gas intake amount model of the combined cycle unit of the gas turbine.
5. The method for determining the heating operation condition of the combined cycle unit of the gas turbine according to claim 4, wherein the standard gas inflow model is obtained by performing a first training on a BP neural network model, and the high-pressure inflow of the gas turbine is input in the first training process, and the standard gas inflow of the gas turbine is output.
6. The method for determining a heating operation condition of a combined cycle unit of a gas turbine according to claim 5, wherein in step S3, a minimum power of the gas turbine is obtained through a power model of the gas turbine of the combined cycle unit of the gas turbine.
7. The method for determining the heating operation condition of a combined cycle unit of a gas turbine according to claim 6, wherein the gas turbine power generation model is obtained by performing a second training on a BP neural network model; in the second training process, the high-pressure steam inlet amount, the rotating speed of the gas turbine, the standard condition gas inlet amount, the opening degree of the IGV valve, the gas temperature and the air temperature are input, and the output is the power generation power of the gas turbine.
8. A system for determining a heating operating condition of a combined cycle unit of a gas turbine, comprising:
the data acquisition module is used for acquiring the actual steam extraction amount of the steam turbine and acquiring a known steam extraction working condition line and a minimum steam extraction amount line of the steam turbine;
the first data processing module is used for determining the high-pressure air intake and the minimum power generation of the steam turbine under the condition of the obtained actual steam extraction of the steam turbine according to the obtained known steam extraction working condition line and the minimum steam extraction line of the steam turbine;
the second data processing module is used for acquiring the standard gas inflow and the minimum power of the gas turbine according to the high-pressure gas inflow of the steam turbine;
the third data processing module is used for acquiring the minimum power generation of the gas turbine combined cycle unit under the acquired actual steam extraction amount of the steam turbine according to the minimum power generation of the steam turbine and the minimum power generation of the gas turbine;
the result output module is used for outputting the minimum power generation of the gas turbine combined cycle unit under the obtained actual steam extraction quantity of the steam turbine and the standard condition gas air inflow of the gas turbine, and determining the heat supply operation working condition of the gas turbine combined cycle unit.
9. A terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of claims 1-7 when the computer program is executed.
10. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the method according to any one of claims 1-7.
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