CN114374216B - Droop control method, droop control device, server, storage medium and computer program product - Google Patents
Droop control method, droop control device, server, storage medium and computer program product Download PDFInfo
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- CN114374216B CN114374216B CN202111397436.5A CN202111397436A CN114374216B CN 114374216 B CN114374216 B CN 114374216B CN 202111397436 A CN202111397436 A CN 202111397436A CN 114374216 B CN114374216 B CN 114374216B
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- 238000004590 computer program Methods 0.000 title claims abstract description 42
- 238000013459 approach Methods 0.000 claims abstract description 42
- 238000007665 sagging Methods 0.000 claims abstract description 29
- 230000008859 change Effects 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 238000012545 processing Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
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- 229910021389 graphene Inorganic materials 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
- H02J3/144—Demand-response operation of the power transmission or distribution network
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Control Of Electrical Variables (AREA)
Abstract
The present application relates to a droop control method, apparatus, server, storage medium and computer program product. The method comprises the following steps: the server determines that the converter station system enters a steady state according to the actual running power of the converter station system, acquires the working voltage of the converter station system, and if the working voltage meets the preset voltage requirement, acquires the voltage corresponding to the actual running power according to the actual running power and the sagging characteristic curve, and controls the voltage of the converter station system to approach the reference voltage according to the actual running power, the reference power and the voltage corresponding to the actual running power. By adopting the method, the voltage deviation of the direct current bus can be reduced.
Description
Technical Field
The present application relates to the field of power electronics, and in particular, to a droop control method, apparatus, server, storage medium, and computer program product.
Background
Because of a plurality of uncertain factors in the distribution network system, the distributed energy access can cause fluctuation of the distribution network system. When the distribution network system is disturbed or the running condition is changed, such as load mutation, the stable running point of the distribution network system is changed.
In the prior art, a droop control method is used for controlling a distribution network system with a stable operation point changed, and a direct-current voltage is changed to enable the system to enter a new stable state. However, the voltage deviation of the direct current bus is larger due to the method in the prior art.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a droop control method, apparatus, server, computer-readable storage medium, and computer program product that can reduce dc bus voltage deviation.
In a first aspect, the present application provides a droop control method, the method comprising:
after determining that the converter station system enters a steady state according to the actual running power of the converter station system, acquiring the working voltage of the converter station system;
if the working voltage meets the preset voltage requirement, obtaining a voltage corresponding to the actual running power according to the actual running power and the sagging characteristic curve;
and controlling the voltage of the converter station system to approach to the reference voltage according to the actual operating power, the reference power, the voltage corresponding to the actual operating power and the reference voltage.
In one embodiment, the controlling the voltage of the converter station system to approach the reference voltage according to the actual operating power, the reference power, the voltage corresponding to the actual operating power, and the reference voltage includes:
Determining a reference current according to the actual operating power, the reference power, and the voltage and the reference voltage corresponding to the actual operating power;
and controlling the input current of the converter station system according to the reference current so as to enable the voltage of the converter station system to approach the reference voltage.
In one embodiment, the determining the reference current according to the actual operating power, the reference power, the voltage corresponding to the actual operating power, and the reference voltage includes:
acquiring a power deviation value according to the actual running power, the reference power and the power coefficient;
acquiring a voltage deviation value according to the voltage corresponding to the actual running power, the reference voltage and the voltage coefficient;
and acquiring the reference current according to the power deviation value and the voltage deviation value.
In one embodiment, the method further comprises:
acquiring a plurality of actual running powers in a preset time window;
and judging whether the converter station system enters a steady state or not according to the actual running powers.
In one embodiment, the determining whether the converter station system enters a steady state according to the plurality of actual operating powers includes:
Acquiring an average value of the actual running powers;
differentiating the average value in the preset time window to obtain a differential power value;
and if the differential power value is not greater than a preset threshold value, determining that the converter station system enters a steady state.
In one embodiment, the operating voltage meets a preset voltage requirement, including:
the operating voltage is not greater than the dc voltage limit and not less than the dc voltage limit.
In a second aspect, the present application also provides a droop control apparatus, the apparatus comprising:
the first acquisition module is used for acquiring the working voltage of the converter station system after determining that the converter station system enters a steady state according to the actual running power of the converter station system;
the second acquisition module is used for acquiring the voltage corresponding to the actual running power according to the actual running power and the sagging characteristic curve under the condition that the working voltage meets the preset voltage requirement;
and the control module is used for controlling the voltage of the converter station system to approach to the reference voltage according to the actual running power, the reference power, the voltage corresponding to the actual running power and the reference voltage.
In a third aspect, the present application also provides a server comprising a memory and a processor, the memory storing a computer program, the processor implementing the following steps when executing the computer program:
after determining that the converter station system enters a steady state according to the actual running power of the converter station system, acquiring the working voltage of the converter station system;
if the working voltage meets the preset voltage requirement, obtaining a voltage corresponding to the actual running power according to the actual running power and the sagging characteristic curve;
and controlling the voltage of the converter station system to approach to the reference voltage according to the actual operating power, the reference power, the voltage corresponding to the actual operating power and the reference voltage.
In a fourth aspect, the present application also provides a computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of:
after determining that the converter station system enters a steady state according to the actual running power of the converter station system, acquiring the working voltage of the converter station system;
if the working voltage meets the preset voltage requirement, obtaining a voltage corresponding to the actual running power according to the actual running power and the sagging characteristic curve;
And controlling the voltage of the converter station system to approach to the reference voltage according to the actual operating power, the reference power, the voltage corresponding to the actual operating power and the reference voltage.
In a fifth aspect, the present application also provides a computer program product comprising a computer program which, when executed by a processor, performs the steps of:
after determining that the converter station system enters a steady state according to the actual running power of the converter station system, acquiring the working voltage of the converter station system;
if the working voltage meets the preset voltage requirement, obtaining a voltage corresponding to the actual running power according to the actual running power and the sagging characteristic curve;
and controlling the voltage of the converter station system to approach to the reference voltage according to the actual operating power, the reference power, the voltage corresponding to the actual operating power and the reference voltage.
According to the sagging control method, the sagging control device, the server, the storage medium and the computer program product, after the server determines that the converter station system enters a steady state according to the actual operation power of the converter station system, the working voltage of the converter station system can be obtained, and under the condition that the working voltage meets the preset voltage requirement, the voltage corresponding to the actual operation power can be accurately obtained according to the actual operation power and the sagging characteristic curve, and then the voltage corresponding to the actual operation power, the reference power and the reference voltage can be obtained according to the actual operation power, so that the voltage of the converter station system is controlled to approach to the reference voltage, and the deviation of a direct current bus is reduced.
Drawings
FIG. 1 is a diagram of an application environment for a droop control method in one embodiment;
FIG. 2 is a flow chart of a droop control method according to an embodiment;
FIG. 3 is a graph showing sagging characteristics in one embodiment;
FIG. 4 is a flow chart of a droop control method according to an embodiment;
FIG. 5 is a flow chart of a droop control method according to an embodiment;
FIG. 6 is a schematic diagram of a droop control process in one embodiment;
FIG. 7 is a flow chart of a droop control method according to an embodiment;
FIG. 8 is a flow chart of a droop control method in an embodiment;
FIG. 9 is a flow chart of a droop control method in an embodiment;
FIG. 10 is a flow chart of a droop control method in an embodiment;
FIG. 11 is a graph showing sagging characteristics in one embodiment;
FIG. 12 is a block diagram of a droop control apparatus according to an embodiment;
FIG. 13 is a block diagram of a droop control apparatus according to an embodiment;
FIG. 14 is a block diagram of a droop control apparatus according to an embodiment;
FIG. 15 is a block diagram of a droop control apparatus according to an embodiment;
fig. 16 is an internal structural diagram of a server in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
The droop control method provided by the embodiment of the application can be applied to an application environment shown in fig. 1. The application environment can comprise a converter station 1 and a server 2, the server 2 can determine that the converter station system enters a steady state according to the actual running power of the converter station system, then obtain the working voltage of the converter station system, if the working voltage meets the preset voltage requirement, obtain the voltage corresponding to the actual running power according to the actual running power and the sagging characteristic curve, and control the voltage of the converter station system to approach to the reference voltage according to the actual running power, the reference power, the voltage corresponding to the actual running power and the reference voltage. The server may be implemented as a stand-alone server or as a server cluster formed by a plurality of servers.
In one embodiment, as shown in fig. 2, a droop control method is provided, and the method is applied to the server in fig. 1 for illustration, and includes the following steps:
S201, after the converter station system is determined to enter a steady state according to the actual running power of the converter station system, the working voltage of the converter station system is obtained.
Optionally, the server may acquire the actual operating power of the converter station system in real time according to the power sensor, or the server may acquire the actual operating power of the converter station system according to the power sensor periodically according to a preset time, and determine whether the converter station system enters a steady state according to the actual operating power of the converter station system. The present embodiment does not limit the manner in which the actual operating power of the converter station system is obtained.
Further, optionally, the server may obtain actual operating powers of the converter station systems at multiple times, and make the actual operating powers of the converter station systems at multiple times worse, if the difference between the actual operating powers of the converter station systems at two adjacent times is smaller than a preset threshold, the variation range of the actual operating powers of the converter station systems in a certain time is smaller, and at this time, the converter station system enters a steady state. Optionally, the server may also obtain actual running powers of the converter station systems at a plurality of moments, average the actual running powers of the converter station systems at the plurality of moments, and if the average value of the obtained actual running powers is within a preset threshold range, it is indicated that the converter station system is in a steady state. The present embodiment is not limited in what method to determine whether the converter station system is in a steady state. And after the converter station system enters a steady state, the server periodically acquires the working voltage of the converter station system through the voltage sensor in real time or according to a preset time period.
S202, if the working voltage meets the preset voltage requirement, obtaining the voltage corresponding to the actual running power according to the actual running power and the sagging characteristic curve.
The droop characteristic is a curve for representing the relationship between the dc voltage and the dc power. The preset voltage requirement may be that the difference between the working voltages at two adjacent moments cannot be greater than a preset threshold, or the preset voltage requirement may be that the working voltage needs to be within a preset maximum voltage value and a preset minimum voltage value, which is not limited in the embodiment of the present application.
Specifically, after the working voltage of the converter station system is obtained in step S202, the server needs to determine whether the working voltage of the converter station system can meet the preset voltage requirement. For example, when the preset voltage requirement is that the working voltage needs to be within the range of a preset maximum voltage value and a preset minimum voltage value, the preset maximum voltage value is 10.5KV, the preset minimum voltage value is 9.5KV, and if the working voltage is 10KV, the working voltage meets the preset voltage requirement; if the working voltage is 11KV or 8.5KV, the working voltage does not meet the preset voltage requirement.
Advancing oneIt will be appreciated that, as shown in fig. 3, in the case that the operating voltage meets the preset voltage requirement, the X-axis of the coordinate axis of the droop characteristic represents the dc power, the Y-axis represents the dc voltage, the dc power and the dc voltage are in one-to-one correspondence, and the dc power corresponding to the point B in the figure is P ref The corresponding direct current voltage is U dcref . The server takes the actual running power as the direct current power value of the X axis, and the direct current voltage value represented by the Y axis can be obtained through the corresponding relation of the sagging characteristic curve.
S203, controlling the voltage of the converter station system to approach the reference voltage according to the actual operation power, the reference power, the voltage corresponding to the actual operation power and the reference voltage.
Wherein the reference power and the reference voltage are obtained based on historical empirical data of the converter station system in a normal operating state.
Specifically, the server compares the actual running power with the reference power and the voltage corresponding to the actual running power, and if the actual running power is larger than the reference power and the voltage corresponding to the actual running power is smaller than the reference voltage, the actual running power is reduced through the PI regulator, and meanwhile the voltage corresponding to the actual running power is increased, so that the actual running power approaches the reference power, and the voltage of the converter station system approaches the reference voltage; if the actual running power is smaller than the reference power, when the voltage corresponding to the actual running power is larger than the reference voltage, the actual running power is increased through the PI regulator, and meanwhile, the voltage corresponding to the actual running power is reduced, so that the actual running power approaches the reference power, and the voltage of the converter station system approaches the reference voltage.
According to the sagging control method, after the server determines that the converter station system enters a steady state according to the actual running power of the converter station system, the working voltage of the converter station system can be obtained, and under the condition that the working voltage meets the preset voltage requirement, the voltage corresponding to the actual running power can be accurately obtained according to the actual running power and the sagging characteristic curve, and then the voltage corresponding to the actual running power, the reference power and the reference voltage can be obtained according to the actual running power, the reference power and the voltage corresponding to the actual running power, so that the voltage of the converter station system is controlled to approach to the reference voltage, and the deviation of a direct current bus is reduced.
Optionally, based on the embodiment shown in fig. 2, as shown in fig. 4, in another embodiment, a specific implementation manner of S203 "controlling the voltage of the converter station system to approach the reference voltage according to the actual operating power, the reference power, the voltage corresponding to the actual operating power, and the reference voltage" is provided, where the method includes:
s401, determining a reference current according to the actual operation power, the reference power, the voltage corresponding to the actual operation power and the reference voltage.
Optionally, the server may determine the reference current according to a relation between power, voltage and current through actual running power, reference power, voltage corresponding to actual running power and reference voltage, or the server may calculate a difference between actual running power and reference power, a difference between voltage corresponding to actual running power and reference voltage, combine a difference between actual running power and reference power and a difference between voltage corresponding to actual running power and reference voltage, multiply the combined difference with a transfer function of the PI regulator, and obtain a result as the reference current.
S402, controlling the input current of the converter station system according to the reference current so as to enable the voltage of the converter station system to approach the reference voltage.
Specifically, the reference current is obtained in step S401, the input current of the converter station system is controlled by the duty ratio of the PWM signal, and the voltage of the converter station system is controlled to approach the reference voltage according to the input current, which may cause a voltage change according to the relationship between the current and the power and the voltage. For example, if the voltage of the converter station is smaller than the reference voltage, the input current of the converter station system needs to be increased, the voltage also increases with the increase of the input current, and the voltage of the corresponding converter station approaches to the reference voltage; if the voltage of the circulation station is greater than the reference voltage, the input current of the converter station system needs to be reduced, the voltage also decreases along with the reduction of the input current, and the voltage of the corresponding converter station approaches to the reference voltage.
According to the droop control method, the server can quickly determine the reference current according to the actual running power, the reference power and the voltage and the reference voltage corresponding to the actual running power, so that the input current of the converter station system can be controlled according to the reference current, and the voltage of the converter station system can be more quickly approximate to the reference voltage.
On the basis of the embodiment shown in fig. 4, as shown in fig. 5, in another embodiment, a specific implementation manner of determining the reference current according to the actual operating power, the reference power, the voltage corresponding to the actual operating power, and the reference voltage in S401 "is provided, where the method includes:
s501, acquiring a power deviation value according to actual running power, reference power and a power coefficient.
Among them, the power coefficient is an important technical data of the power system, and the magnitude of the power coefficient is related to the load property of the circuit.
Specifically, the server calculates a difference value between the actual operating power and the reference power of the converter station system, multiplies the difference value between the actual operating power and the reference power by a power coefficient, and uses the obtained product as a power deviation value, where the power deviation value may be expressed as:
ΔP＝K P (P-P 1 )，
in the above formula, ΔP represents the power deviation value, K P Represents the power coefficient, P represents the actual operating power, P 1 Representing the reference power at the new steady state.
S502, obtaining a voltage deviation value according to the voltage, the reference voltage and the voltage coefficient corresponding to the actual running power.
The voltage coefficient is a relative change of resistance value every one volt of voltage change within a prescribed voltage range, and thus the voltage coefficient needs to be set. The voltage deviation value represents the product of the voltage coefficient and the difference value between the voltage corresponding to the actual operating power and the reference voltage.
Specifically, the server calculates a difference value between a voltage corresponding to actual operating power of the converter station system and a reference voltage, multiplies the difference value between the voltage corresponding to the actual operating power and the reference voltage by a voltage coefficient, and uses the obtained product as a voltage deviation value, where the voltage deviation value can be expressed as:
ΔU＝K U (U-U dcref )，
in the above formula, deltaU represents the voltage deviation value, K U The voltage coefficient is represented, U represents the voltage corresponding to the actual running power, U dcref Representing the reference voltage.
S503, acquiring a reference current according to the power deviation value and the voltage deviation value.
Specifically, after the server obtains the power deviation value and the voltage deviation value through step S501 and step S502, the reference current may be obtained through the PI regulator, as shown in fig. 6, where the reference current may be expressed as:
i ref ＝K PI [K P (P-P 1 )+K U (U-U dcref )]，
in the above, i ref Represents the reference current, K PI Representing a PI regulator.
According to the sagging control method, the server can acquire the power deviation value according to the actual running power, the reference power and the power coefficient, so that the voltage deviation value can be accurately acquired according to the voltage, the reference voltage and the voltage coefficient corresponding to the actual running power, and further the accuracy of acquiring the reference current can be improved according to the power deviation value and the voltage deviation value.
Based on the embodiment shown in fig. 2, the converter station system is determined to enter a steady state according to the actual operating power of the converter station system, and how to determine whether the converter station system enters the steady state according to the actual operating power of the converter station system is mainly described below, in another embodiment, as shown in fig. 7, the method further includes:
s701, acquiring a plurality of actual running powers in a preset time window.
Specifically, the server may obtain, through the power sensor, a plurality of actual operating powers within a preset time window. For example, the preset time window is y= { y 1 ,y 2 ,…,y t Pre-set timeThe number of actual operating powers within the inter-window may be represented as p= { P 1 ,P 2 ,…,P t }。
S702, judging whether the converter station system enters a steady state according to a plurality of actual running powers.
Specifically, after the server obtains a plurality of actual running powers in a preset time window through step S701, optionally, the server may average the plurality of actual running powers, and if the average value of the plurality of actual running powers is in a first preset range, the converter station system enters a steady state; if the average value of the actual running powers is not in the first preset range, the converter station system does not enter a steady state. Optionally, the server may perform weighted average calculation on the plurality of actual operating powers to obtain a weighted average, and if the weighted average of the plurality of actual operating powers is within a second preset range, the converter station system enters a steady state; if the weighted average of the actual operating powers is not within the second preset range, the converter station system does not enter a steady state.
According to the droop control method, the server can accurately judge whether the converter station system enters a steady state according to the actual operating powers by acquiring the actual operating powers in the preset time window.
Based on the embodiment shown in fig. 7, as shown in fig. 8, in another embodiment, a specific implementation manner of S702 "determining whether the converter station system enters a steady state according to a plurality of actual operating powers" is provided, where the method includes:
s801, an average value of a plurality of actual running powers is obtained.
Specifically, the server averages a plurality of actual running powers in a preset time window through a moving average period to obtain an average value of the plurality of actual running powers, where the average value of the plurality of actual running powers can be expressed as:
in the above-mentioned method, the step of,representing an average of a plurality of actual operating powers.
S802, differentiating the average value in a preset time window to obtain a differential power value.
Specifically, after obtaining the average value of the plurality of actual running powers through step S801, the server performs differential processing on the average value of the plurality of actual running powers by using a differential formula, and uses the differential result as a differential power value, where the differential power value may be expressed as:
In the above formula, P' represents a differential power value.
S803, if the differential power value is not greater than the preset threshold value, determining that the converter station system enters a steady state.
Specifically, the server judges the magnitude of the differential power value and a preset threshold value, and when the differential power value is smaller than or equal to the preset threshold value, the converter station system enters a steady state; when the differential power value is greater than the preset threshold, the converter station system does not enter a steady state.
In the droop control method, the server can differentiate the average value in the preset time window by acquiring the average value of the actual running powers, so that the differential power value can be quickly obtained, and the converter station system can be quickly determined to enter a steady state under the condition that the differential power value is not larger than the preset threshold value.
In one embodiment, as shown in fig. 9, for the convenience of understanding by those skilled in the art, a droop control method is described in detail below, and may include:
s901, acquiring a plurality of actual running powers in a preset time window;
s902, obtaining an average value of a plurality of actual running powers;
s903, differentiating the average value in a preset time window to obtain a differential power value;
s904, if the differential power value is not greater than a preset threshold value, determining that the converter station system enters a steady state, and acquiring the working voltage of the converter station system;
S905, if the working voltage is not greater than the direct current upper limit value and not less than the direct current lower limit value, obtaining a voltage corresponding to the actual operating power according to the actual operating power and the sagging characteristic curve;
s906, acquiring a power deviation value according to the actual running power, the reference power and the power coefficient;
s907, obtaining a voltage deviation value according to the voltage, the reference voltage and the voltage coefficient corresponding to the actual running power;
s908, acquiring a reference current according to the power deviation value and the voltage deviation value.
S909, controlling the input current of the converter station system according to the reference current so that the voltage of the converter station system approaches the reference voltage.
It should be noted that, for the description in S901-S909, reference may be made to the description related to the above embodiment, and the effects thereof are similar, which is not repeated here.
Further, the sagging control method provided for the present application is described in detail with reference to the flowchart shown in fig. 10 and the sagging characteristic graph shown in fig. 11. In the flowchart shown in fig. 10, when the dc bus voltage fluctuates, the actual operating power of the converter station system is first obtained, differential operation is performed on the actual operating power of the converter station, whether the system power reaches a new steady state is determined, meanwhile, whether the dc voltage signal is within the maximum deviation range allowed by the reference voltage is determined, if the system has reached the new steady state and the dc voltage signal is within the maximum deviation range, the relation between the output voltage of the converter station and the active power is adopted, the power reference value in the droop curve is reset, and the droop characteristic curve is translated according to the new power reference value, so that the system is at a new steady state point, the voltage deviation is eliminated at this time, and the dc voltage is recovered to the reference value, thereby realizing the function of stabilizing the dc voltage. Fig. 11 is a droop characteristic curve, in which a process of changing a stable point in the droop characteristic curve can be seen, and it is assumed that the power of the converter station at the initial moment is stably operated at a point B with a droop slope of 2, when a load dip occurs in the converter station system, the droop steady-state operating point of the converter station is shifted from the point B to a point C of the droop curve 2, at this time, the direct current voltage of the system is increased, and at the same time, the system is operated at a new power reference value, and a voltage deviation occurs in the system. When the droop characteristic curve is modified to be 3, the operating point of the converter station system is stabilized at the new operating point A, the voltage deviation is eliminated at the same time, and the direct current voltage is recovered to the reference value.
According to the droop control method, the server can obtain the average value of the actual running powers by obtaining the actual running powers in the preset time window, differentiate the average value in the preset time window to obtain the differential power value, determine that the converter station system enters a steady state if the differential power value is not larger than the preset threshold value, and can obtain the working voltage of the converter station system, if the working voltage is not larger than the direct current upper limit value and not smaller than the direct current lower limit value, the voltage corresponding to the actual running power can be accurately obtained according to the actual running power and the droop characteristic curve, the power deviation value can be obtained according to the actual running power, the reference power and the power coefficient, the voltage corresponding to the actual running power, the reference voltage and the voltage coefficient can be obtained according to the voltage deviation value and the voltage deviation value, the input current of the converter station system is controlled according to the reference current, and the voltage of the converter station system is enabled to approach the reference voltage, and the deviation of the direct current bus voltage is reduced.
It should be understood that, although the steps in the flowcharts related to the above embodiments are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described in the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternately with at least some of the other steps or stages.
Based on the same inventive concept, the embodiment of the application also provides a sagging control device for realizing the sagging control method. The implementation of the solution provided by the device is similar to that described in the above method, so specific limitations in one or more embodiments of the droop control device provided below may be referred to above as limitations of the droop control method, and will not be described herein.
In one embodiment, as shown in fig. 12, there is provided a sagging control apparatus comprising: a first acquisition module 11, a second acquisition module 12 and a control module 13, wherein:
the first obtaining module 11 is configured to obtain an operating voltage of the converter station system after determining that the converter station system enters a steady state according to an actual operating power of the converter station system;
the second obtaining module 12 is configured to obtain, according to the actual operating power and the droop characteristic curve, a voltage corresponding to the actual operating power when the operating voltage meets a preset voltage requirement;
optionally, the operating voltage is not greater than the dc voltage limit and not less than the dc voltage limit.
The control module 13 is configured to control the voltage of the converter station system to approach the reference voltage according to the actual operating power, the reference power, the voltage corresponding to the actual operating power, and the reference voltage.
The droop control device provided in this embodiment may execute the above method embodiment, and its implementation principle and technical effects are similar, and will not be described herein.
In one embodiment, as shown in fig. 13, the control module 13 includes: a first determining unit 131, a control unit 132, wherein:
a first determining unit 131, configured to determine a reference current according to an actual operating power, a reference power, a voltage corresponding to the actual operating power, and a reference voltage;
the control unit 132 is configured to control an input current of the converter station system according to the reference current so that a voltage of the converter station system approaches the reference voltage.
The droop control device provided in this embodiment may execute the above method embodiment, and its implementation principle and technical effects are similar, and will not be described herein.
On the basis of the above embodiment, optionally, the first determining unit 131 is specifically configured to obtain a power deviation value according to an actual operating power, a reference power and a power coefficient; acquiring a voltage deviation value according to voltage, reference voltage and voltage coefficient corresponding to actual running power; and acquiring a reference current according to the power deviation value and the voltage deviation value.
The droop control device provided in this embodiment may execute the above method embodiment, and its implementation principle and technical effects are similar, and will not be described herein.
In one embodiment, as shown in fig. 14, the method further includes: a third obtaining module 14, a judging module 15, wherein:
a third obtaining module 14, configured to obtain a plurality of actual operating powers within a preset time window;
and the judging module 15 is used for judging whether the converter station system enters a steady state according to the actual operating powers.
The droop control device provided in this embodiment may execute the above method embodiment, and its implementation principle and technical effects are similar, and will not be described herein.
In one embodiment, as shown in fig. 15, the determining module 15 includes: a first acquisition unit 151, a second determination unit 152, and a third determination unit 153, wherein:
a first acquisition unit 151 for acquiring an average value of a plurality of actual running powers;
a second determining unit 152, configured to differentiate the average value within a preset time window to obtain a differentiated power value;
the third determining unit 153 is configured to determine that the converter station system enters a steady state if the differential power value is not greater than a preset threshold value.
The droop control device provided in this embodiment may execute the above method embodiment, and its implementation principle and technical effects are similar, and will not be described herein.
The respective modules in the droop control apparatus described above may be implemented in whole or in part by software, hardware, or a combination thereof. The above modules may be embedded in hardware or independent of a processor in a server, or may be stored in software in a memory in the server, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, a server is provided, the internal structure of which may be as shown in fig. 16. The server includes a processor, memory, and a network interface connected by a system bus. Wherein the processor of the server is configured to provide computing and control capabilities. The memory of the server includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The database of the server is used to store power and voltage data in droop control. The network interface of the server is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a droop control method.
It will be appreciated by those skilled in the art that the structure shown in fig. 16 is merely a block diagram of a portion of the structure associated with the present application and is not limiting of the server to which the present application is applied, and that a particular server may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.
In one embodiment, a server is provided that includes a memory and a processor, the memory having a computer program stored therein, the processor when executing the computer program performing the steps of:
after the converter station system is determined to enter a steady state according to the actual running power of the converter station system, the working voltage of the converter station system is obtained;
if the working voltage meets the preset voltage requirement, obtaining the voltage corresponding to the actual running power according to the actual running power and the sagging characteristic curve;
and controlling the voltage of the converter station system to approach to the reference voltage according to the actual operating power, the reference power and the voltage corresponding to the actual operating power and the reference voltage.
In one embodiment, the processor when executing the computer program further performs the steps of: controlling the voltage of the converter station system to approach the reference voltage according to the actual operating power, the reference power and the voltage corresponding to the actual operating power and the reference voltage, comprising:
Determining a reference current according to the actual operating power, the reference power and the voltage and the reference voltage corresponding to the actual operating power;
the input current of the converter station system is controlled in dependence of the reference current such that the voltage of the converter station system approaches the reference voltage.
In one embodiment, the processor when executing the computer program further performs the steps of: determining a reference current according to the actual operating power, the reference power, and the voltage and the reference voltage corresponding to the actual operating power, including:
acquiring a power deviation value according to the actual running power, the reference power and the power coefficient;
acquiring a voltage deviation value according to voltage, reference voltage and voltage coefficient corresponding to actual running power;
and acquiring a reference current according to the power deviation value and the voltage deviation value.
In one embodiment, the processor when executing the computer program further performs the steps of:
acquiring a plurality of actual running powers in a preset time window;
and judging whether the converter station system enters a steady state or not according to the actual running powers.
In one embodiment, the processor when executing the computer program further performs the steps of: judging whether the converter station system enters a steady state according to a plurality of actual running powers, comprising:
Acquiring an average value of a plurality of actual running powers;
differentiating the average value in a preset time window to obtain a differential power value;
and if the differential power value is not greater than the preset threshold value, determining that the converter station system enters a steady state.
In one embodiment, the processor when executing the computer program further performs the steps of: the working voltage meets the preset voltage requirement, comprising:
the operating voltage is not greater than the dc voltage limit and not less than the dc voltage limit.
In one embodiment, a computer readable storage medium is provided having a computer program stored thereon, which when executed by a processor, performs the steps of:
after the converter station system is determined to enter a steady state according to the actual running power of the converter station system, the working voltage of the converter station system is obtained;
if the working voltage meets the preset voltage requirement, obtaining the voltage corresponding to the actual running power according to the actual running power and the sagging characteristic curve;
and controlling the voltage of the converter station system to approach to the reference voltage according to the actual operating power, the reference power and the voltage corresponding to the actual operating power and the reference voltage.
In one embodiment, the computer program when executed by the processor further performs the steps of: controlling the voltage of the converter station system to approach the reference voltage according to the actual operating power, the reference power and the voltage corresponding to the actual operating power and the reference voltage, comprising:
Determining a reference current according to the actual operating power, the reference power and the voltage and the reference voltage corresponding to the actual operating power;
the input current of the converter station system is controlled in dependence of the reference current such that the voltage of the converter station system approaches the reference voltage.
In one embodiment, the computer program when executed by the processor further performs the steps of: determining a reference current according to the actual operating power, the reference power, and the voltage and the reference voltage corresponding to the actual operating power, including:
acquiring a power deviation value according to the actual running power, the reference power and the power coefficient;
acquiring a voltage deviation value according to voltage, reference voltage and voltage coefficient corresponding to actual running power;
and acquiring a reference current according to the power deviation value and the voltage deviation value.
In one embodiment, the computer program when executed by the processor further performs the steps of:
acquiring a plurality of actual running powers in a preset time window;
and judging whether the converter station system enters a steady state or not according to the actual running powers.
In one embodiment, the computer program when executed by the processor further performs the steps of: judging whether the converter station system enters a steady state according to a plurality of actual running powers, comprising:
Acquiring an average value of a plurality of actual running powers;
differentiating the average value in a preset time window to obtain a differential power value;
and if the differential power value is not greater than the preset threshold value, determining that the converter station system enters a steady state.
In one embodiment, the computer program when executed by the processor further performs the steps of: the working voltage meets the preset voltage requirement, comprising:
the operating voltage is not greater than the dc voltage limit and not less than the dc voltage limit.
In one embodiment, a computer program product is provided comprising a computer program which, when executed by a processor, performs the steps of:
after the converter station system is determined to enter a steady state according to the actual running power of the converter station system, the working voltage of the converter station system is obtained;
if the working voltage meets the preset voltage requirement, obtaining the voltage corresponding to the actual running power according to the actual running power and the sagging characteristic curve;
and controlling the voltage of the converter station system to approach to the reference voltage according to the actual operating power, the reference power and the voltage corresponding to the actual operating power and the reference voltage.
In one embodiment, the computer program when executed by the processor further performs the steps of: controlling the voltage of the converter station system to approach the reference voltage according to the actual operating power, the reference power and the voltage corresponding to the actual operating power and the reference voltage, comprising:
Determining a reference current according to the actual operating power, the reference power and the voltage and the reference voltage corresponding to the actual operating power;
the input current of the converter station system is controlled in dependence of the reference current such that the voltage of the converter station system approaches the reference voltage.
In one embodiment, the computer program when executed by the processor further performs the steps of: determining a reference current according to the actual operating power, the reference power, and the voltage and the reference voltage corresponding to the actual operating power, including:
acquiring a power deviation value according to the actual running power, the reference power and the power coefficient;
acquiring a voltage deviation value according to voltage, reference voltage and voltage coefficient corresponding to actual running power;
and acquiring a reference current according to the power deviation value and the voltage deviation value.
In one embodiment, the computer program when executed by the processor further performs the steps of:
acquiring a plurality of actual running powers in a preset time window;
and judging whether the converter station system enters a steady state or not according to the actual running powers.
In one embodiment, the computer program when executed by the processor further performs the steps of: judging whether the converter station system enters a steady state according to a plurality of actual running powers, comprising:
Acquiring an average value of a plurality of actual running powers;
differentiating the average value in a preset time window to obtain a differential power value;
and if the differential power value is not greater than the preset threshold value, determining that the converter station system enters a steady state.
In one embodiment, the computer program when executed by the processor further performs the steps of: the working voltage meets the preset voltage requirement, comprising:
the operating voltage is not greater than the dc voltage limit and not less than the dc voltage limit.
It should be noted that, user information (including but not limited to user equipment information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, presented data, etc.) referred to in the present application are information and data authorized by the user or sufficiently authorized by each party.
Those skilled in the art will appreciate that implementing all or part of the above-described methods in accordance with the embodiments may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in the various embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile memory may include Read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high density embedded nonvolatile memory, resistive random access memory (ReRAM), magnetic random access memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric memory (Ferroelectric RandomAccess Memory, FRAM), phase change memory (Phase Change Memory, PCM), graphene memory, and the like. Volatile memory can include random access memory (RandomAccess Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as static random access memory (Static RandomAccess Memory, SRAM) or dynamic random access memory (Dynamic RandomAccess Memory, DRAM), and the like. The databases referred to in the various embodiments provided herein may include at least one of relational databases and non-relational databases. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processors referred to in the embodiments provided herein may be general purpose processors, central processing units, graphics processors, digital signal processors, programmable logic units, quantum computing-based data processing logic units, etc., without being limited thereto.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples represent only a few embodiments of the present application, which are described in more detail and are not thereby to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application shall be subject to the appended claims.
Claims (10)
1. A droop control method, the method comprising:
after determining that the converter station system enters a steady state according to the actual running power of the converter station system, acquiring the working voltage of the converter station system;
if the working voltage meets the preset voltage requirement, obtaining a voltage corresponding to the actual running power according to the actual running power and the sagging characteristic curve; the droop characteristic curve is a curve for representing the relationship between the direct current voltage and the direct current power;
Controlling the voltage of the converter station system to approach the reference voltage according to the actual operating power, the reference power, the voltage corresponding to the actual operating power and the reference voltage;
the step of controlling the voltage of the converter station system to approach to the reference voltage according to the actual operating power, the reference power, the voltage corresponding to the actual operating power and the reference voltage comprises the following steps:
determining a reference current according to the actual operating power, the reference power, and the voltage and the reference voltage corresponding to the actual operating power;
controlling the input current of the converter station system according to the reference current so as to enable the voltage of the converter station system to approach to the reference voltage, specifically: controlling the input current of the converter station system through the duty ratio of the PWM signal, wherein the change of the input current can cause the change of the voltage according to the relation between the current, the power and the voltage, and the voltage of the converter station system can be controlled to approach to the reference voltage according to the input current;
the determining the reference current according to the actual running power, the reference power, the voltage corresponding to the actual running power and the reference voltage comprises the following steps:
According to the actual running power, the reference power and the power coefficient, a power deviation value is obtained, specifically: calculating a difference value between actual operation power and reference power of the converter station system, multiplying the difference value between the actual operation power and the reference power by a power coefficient, and taking the obtained product as a power deviation value, wherein the power deviation value is expressed as:
，
in the above-mentioned method, the step of,representing the power deviation value, +.>Representing the power factor>Representing the actual operating power, +.>Representing the reference power at the new steady state;
according to the voltage corresponding to the actual running power, the reference voltage and the voltage coefficient, a voltage deviation value is obtained, specifically: calculating the difference value between the voltage corresponding to the actual operating power of the converter station system and the reference voltage, multiplying the difference value between the voltage corresponding to the actual operating power and the reference voltage by a voltage coefficient, and taking the obtained product as a voltage deviation value, wherein the voltage deviation value is expressed as:
，
in the above-mentioned method, the step of,representing the voltage deviation value, ">Representing the voltage coefficient, < >>Representing the voltage corresponding to the actual operating power,representing a reference voltage;
acquiring the reference current according to the power deviation value and the voltage deviation value; the method comprises the following steps: after the power deviation value and the voltage deviation value are obtained, a reference current can be obtained after the PI regulator is passed through, and the reference current is expressed as:
，
In the above-mentioned method, the step of,representing the reference current +.>Representing the coefficients of a PI regulator；
The method further comprises the steps of:
acquiring a plurality of actual running powers in a preset time window;
and judging whether the converter station system enters a steady state or not according to the actual running powers.
2. The method of claim 1, wherein said determining whether the converter station system is in steady state based on the plurality of actual operating powers comprises:
acquiring an average value of the actual running powers;
differentiating the average value in the preset time window to obtain a differential power value;
and if the differential power value is not greater than a preset threshold value, determining that the converter station system enters a steady state.
3. The method according to claim 1 or 2, wherein the operating voltage meets a preset voltage requirement, comprising:
the operating voltage is not greater than a preset maximum voltage value and not less than a preset minimum voltage value.
4. A method according to claim 1 or 2, characterized in that the X-axis of the coordinate axes of the sagging characteristic curve represents a direct current power and the Y-axis represents a direct current voltage, the direct current power and the direct current voltage being in a one-to-one correspondence.
5. A method according to claim 1 or 2, characterized in that the reference power and reference voltage are obtained from historical empirical data of the converter station system in normal operating conditions.
6. A method according to claim 1 or 2, characterized in that the power factor is determined on the basis of the load properties of the circuit.
7. A droop control apparatus for use in the droop control method according to claim 1, characterised in that the apparatus comprises:
the first acquisition module is used for acquiring the working voltage of the converter station system after determining that the converter station system enters a steady state according to the actual running power of the converter station system; the droop characteristic curve is a curve for representing the relationship between the direct current voltage and the direct current power;
the second acquisition module is used for acquiring the voltage corresponding to the actual running power according to the actual running power and the sagging characteristic curve under the condition that the working voltage meets the preset voltage requirement;
the control module is used for controlling the voltage of the converter station system to approach to the reference voltage according to the actual running power, the reference power, the voltage corresponding to the actual running power and the reference voltage;
The step of controlling the voltage of the converter station system to approach to the reference voltage according to the actual operating power, the reference power, the voltage corresponding to the actual operating power and the reference voltage comprises the following steps:
determining a reference current according to the actual operating power, the reference power, and the voltage and the reference voltage corresponding to the actual operating power;
controlling the input current of the converter station system according to the reference current so as to enable the voltage of the converter station system to approach to the reference voltage, specifically: controlling the input current of the converter station system through the duty ratio of the PWM signal, wherein the change of the input current can cause the change of the voltage according to the relation between the current, the power and the voltage, and the voltage of the converter station system can be controlled to approach to the reference voltage according to the input current;
the determining the reference current according to the actual running power, the reference power, the voltage corresponding to the actual running power and the reference voltage comprises the following steps:
according to the actual running power, the reference power and the power coefficient, a power deviation value is obtained, specifically: calculating a difference value between actual operation power and reference power of the converter station system, multiplying the difference value between the actual operation power and the reference power by a power coefficient, and taking the obtained product as a power deviation value, wherein the power deviation value is expressed as:
，
In the above-mentioned method, the step of,representing the power deviation value, +.>Representing the power factor>Representing the actual operating power, +.>Representing the reference power at the new steady state;
according to the voltage corresponding to the actual running power, the reference voltage and the voltage coefficient, a voltage deviation value is obtained, specifically: calculating the difference value between the voltage corresponding to the actual operating power of the converter station system and the reference voltage, multiplying the difference value between the voltage corresponding to the actual operating power and the reference voltage by a voltage coefficient, and taking the obtained product as a voltage deviation value, wherein the voltage deviation value is expressed as:
，
in the above-mentioned method, the step of,representing the voltage deviation value, ">Representing the voltage coefficient, < >>Representing the voltage corresponding to the actual operating power,representing a reference voltage;
acquiring the reference current according to the power deviation value and the voltage deviation value; the method comprises the following steps: after the power deviation value and the voltage deviation value are obtained, a reference current can be obtained after the PI regulator is passed through, and the reference current is expressed as:
，
in the above-mentioned method, the step of,representing the reference current +.>A coefficient representing the PI regulator;
the method further comprises the steps of:
acquiring a plurality of actual running powers in a preset time window;
and judging whether the converter station system enters a steady state or not according to the actual running powers.
8. A server comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any one of claims 1 to 6 when the computer program is executed.
9. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 6.
10. A computer program product comprising a computer program, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 6.
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