A deep-sea large-capacity multi-property offshore wind power centralized sending-out metering method

Abstract

The application relates to a kind of deep sea large-capacity multi-property offshore wind power centralized sending-out metering methods, comprising the following steps: setting metering device to collect data;According to the relationship between the power and loss of onshore coupling transformer, offshore coupling transformer, DC sea cable, onshore converter and offshore converter, design the loss formula of onshore coupling transformer, offshore coupling transformer, DC sea cable, onshore converter and offshore converter;According to the data collected by the metering device and the loss formula, the calculation method of the on-grid power of each property wind farm in a cycle is constructed;According to the calculation method, the on-grid power of each property wind farm in a cycle is obtained.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of deep sea large-capacity multi-property offshore wind power centralized sending out metering method, belong to metering billing field. BACKGROUND

[0002] The power industry generally defines offshore wind power with transmission distance exceeding 70km as deep sea, and defines capacity greater than 1GW as large capacity. With the continuous progress of wind power technology, offshore wind power has developed from initial single small-scale power generation to today's large-capacity wind farm. The wind speed in deep sea area is stable and the wind power resource is abundant, so these areas have become the focus of future wind power development. However, the characteristics of being far away from land make the construction, maintenance and power transmission of wind farm more complex.

[0003] Deep sea wind farm is usually far away from land and has large water depth, so special floating wind turbine platform or semi-submersible platform needs to be used. Such wind farm not only has high construction cost, but also has difficulties in operation and maintenance and power transmission. In order to effectively concentrate the power transmission, it is necessary to solve how to carry out efficient power transmission and metering in harsh marine environment.

[0004] In deep sea wind farm, usually cooperation of multiple property subjects is involved, which may include different investors, operators and grid companies. The interests of different property subjects in power generation, distribution and metering may be different, so an effective centralized metering method is needed to ensure fair distribution of power benefits and accurately reflect the contribution of each party.

[0005] The prior art such as the Chinese patent with the patent number "CN113972652A" discloses a method for staged gateway metering of offshore wind farm single mother double section. It includes that in the offshore wind farm, the gateway metering points 3024 and 380 are added in the second phase. The metering point 3024 is installed between the second branch of the #2 main transformer and the switch 3024, used for metering the power of the second phase grid connection; the metering point 380 is installed between the 35kV III section bus and the switch 380, used for metering the power during the maintenance of the #2 main transformer. When the wind turbine of the first phase is connected to the grid, the switches 4E11, 46F7, 46F8, 2601 and 2602 are closed, and the switches 2600, 370 and 380 are disconnected; the power generated by the wind farm is collected through the 35kV I, II and III section buses, flows into the #1 and #2 main transformers, and then flows into the 220kV positive bus, and finally is connected to the grid through the 4E11 line. At this time, the power is metered by the gateway metering point of the first phase, and the unified state subsidy power price is executed. When the wind turbine of the second phase is connected to the grid, the switch configuration remains unchanged; the power generated by the wind turbine of the first phase is collected in the #1 main transformer, and the power generated by the wind turbine of the second phase is collected in the #2 main transformer through the 35kV IV section bus, and then flows into the 220kV positive bus. The power is connected to the grid through the 4E11 line, and the state subsidy power price and the flat price power price are executed. The offshore wind farm power = 4E11 line positive active power, the first phase power = total power - second phase power, and the second phase power = 3024 positive active power.

[0006] The problem of the above-mentioned prior art is that the metering is mainly based on the reading of the gateway metering point, which may be affected by various factors such as the accuracy of the metering equipment, line loss, transformer loss, etc., resulting in certain errors in the metering result. It is necessary to add gateway metering points at different periods of wind turbine grid connection, and special algorithms are used to count and meter the power of the power grid at different periods. This increases the complexity and cost of management, because these gateway metering points need to be regularly maintained and calibrated, and the accuracy and reliability of their data need to be ensured. SUMMARY

[0007] In order to solve the problems existing in the above-mentioned prior art, the present application provides a deep sea large capacity multi-property offshore wind power centralized sending and metering method.

[0008] The technical scheme of the present application is as follows:

[0009] On the one hand, the present application provides a deep sea large capacity multi-property offshore wind power centralized sending and metering method, the offshore wind power centralized sending and metering system includes a centralized sending system, a power grid and a wind farm, the centralized sending system includes an onshore connection transformer, an offshore connection transformer, a direct current submarine cable, an onshore converter and an offshore converter, and includes the following steps:

[0010] Setting up a metering device to collect data;

[0011] According to the relationship between the power and the loss of the onshore coupling transformer, the offshore coupling transformer, the DC submarine cable, the onshore converter and the offshore converter, a loss formula of the onshore coupling transformer, the offshore coupling transformer, the DC submarine cable, the onshore converter and the offshore converter is designed;

[0012] According to the data collected by the metering device and the loss formula, a calculation method of the on-grid power of each property wind farm in a cycle is constructed;

[0013] According to the calculation method, the on-grid power of each property wind farm in a cycle is obtained.

[0014] As a preferred embodiment, the metering device comprises analog metering devices D L1 , D L2 , D H1 , D H2 , {D F1 ...D Fn ...D Fm} and digital metering devices D H3 , D L3 ;

[0015] The analog metering devices D L1 are arranged at the property boundary points of the power grid and the centralized power transmission system;

[0016] The analog metering devices D L2 are arranged at the circuit connecting the onshore coupling transformer and the onshore converter;

[0017] The analog metering devices D H1 are arranged at the circuit connecting the offshore coupling transformer and the property boundary points of each wind farm;

[0018] The analog metering devices D H2 are arranged at the circuit connecting the offshore coupling transformer and the offshore converter;

[0019] The analog metering devices {D F1 ...D Fn ...D Fm} are arranged at the property boundary points of the centralized power transmission system and each wind farm;

[0020] Among them, D F1 ...D Fn ...D Fm} in the analog metering device {D Fn represents the n-th device arranged at the property boundary point of the centralized power transmission system and the n-th wind farm, n∈[1, m];

[0021] The digital metering devices D H3 are arranged at the circuit connecting the DC submarine cable and the onshore converter;

[0022] Digital metering device D L3 Set at the circuit connection of the DC submarine cable and the offshore converter station.

[0023] As a preferred embodiment, the onshore connection transformer loss P LTsFn is expressed as:

[0024]

[0025] The offshore connection transformer loss P LTsFn of the nth property wind farm is expressed as:

[0026]

[0027] wherein, D represents the analog metering device H3 the square of the collected real-time power data, D represents the analog metering device F1 ...D Fn ...D Fm the sum of the collected real-time power data, P Fn D represents the analog metering device H3 the collected real-time power data, ∑P Fn D represents the analog metering device F1 ...D Fn ...D Fm the sum of the collected real-time power data, P LTsFe P represents the no-load loss of the onshore connection transformer HTsFe P represents the no-load loss of the offshore connection transformer LTs P represents the loss of the onshore connection transformer HTs P represents the loss of the offshore connection transformer.

[0028] As a preferred embodiment, the DC submarine cable loss P LsFn of the nth property wind farm is expressed as:

[0029]

[0030] wherein, P Ls represents the DC submarine cable load loss.

[0031] As a preferred embodiment, the loss formula of the onshore converter station and the offshore converter station includes a simplified calculation method and an accurate calculation method;

[0032] According to the simplified calculation method, the onshore converter station loss P LMsFn of the nth property wind farm of the simplified calculation method is expressed as:

[0033]

[0034] wherein P LMs represents the loss of the onshore converter;

[0035] The offshore converter loss P HMsFn of the nth property wind farm is simplified by the simplified calculation method.

[0036]

[0037] wherein P HMs represents the loss of the offshore converter;

[0038] The onshore converter loss P of the nth property wind farm in the xth statistical period is calculated accurately according to the accurate calculation method.

[0039]

[0040] wherein represents the analog metering device D L3 that collects the statistical power data in the xth statistical period, represents the analog metering device D L2 that collects the statistical power data in the xth statistical period, represents the proportion of the power square relationship part of the onshore converter in the xth statistical period, represents the property demarcation point metering device D Fn of the centralized power transmission system and each wind farm, represents the property demarcation point metering device D F1 ...D Fn ...D Fm of the centralized power transmission system and each wind farm, Fn represents the property demarcation point metering device D F1 ...D Fn ...D Fm of the centralized power transmission system and each wind farm, represents the analog metering device D Fn that collects the statistical power data in the xth statistical period, represents the analog metering device D F1 ...D Fn ...D Fm that collects the statistical power data in the xth statistical period, Fn represents the property demarcation point metering device D FnStatistical power in a cycle;

[0041] Loss of the offshore converter in the xth statistical cycle is:

[0042]

[0043] wherein, D represents the analog quantity metering device D in the xth statistical cycle H2 Statistical power data collected, D represents the analog quantity metering device D in the xth statistical cycle H3 Statistical power data collected, S represents the proportion of the power square relationship part of the offshore converter in the xth statistical cycle.

[0044] As a preferred embodiment, the loss S of the onshore coupling transformer in a cycle LTs is:

[0045] S LTs =S L2 -S L1 ;

[0046] The loss S of the onshore converter in a cycle LMs is:

[0047] S LMs =S L3 -S L2 ;

[0048] The loss S of the DC sea cable in a cycle Ls is:

[0049] S Ls =S H3 -S L3 ;

[0050] The loss S of the offshore converter in a cycle HMs is:

[0051] S HMs =S H2 -S H3 ;

[0052] The loss S of the offshore coupling transformer in a cycle HTs is:

[0053] S HTs =S H1 -S H2 ;

[0054] wherein, S L1 D represents the analog quantity metering device D L1Statistical power in a cycle, S L2 Analog quantity metering device D L2 Statistical power in a cycle, S L3 Digital metering device D L3 Statistical power in a cycle, S H3 Digital metering device D H3 Statistical power in a cycle, S H2 Analog quantity metering device D H2 Statistical power in a cycle, S H1 Analog quantity metering device D H1 Statistical power in a cycle.

[0055] As a preferred embodiment, the method for calculating the on-grid power of each property wind farm in a cycle S Wn It includes a simplified calculation method and an accurate calculation method.

[0056] As a preferred embodiment, the simplified calculation method includes a less accurate calculation formula and a simplified calculation formula.

[0057] The less accurate calculation formula is represented as:

[0058]

[0059] Wherein, S LTsFe Indicates the no-load loss power of the onshore connection transformer in a cycle, S HTsFe Indicates the no-load loss power of the offshore connection transformer in a cycle, S LTsFn Indicates the allocated loss of the onshore connection transformer of the nth property wind farm in a cycle, S LMsFn Indicates the allocated loss of the onshore converter of the nth property wind farm in a cycle, S LsFn Indicates the allocated loss of the DC sea cable of the nth property wind farm in a cycle, S HMsFn Indicates the allocated loss of the offshore converter of the nth property wind farm in a cycle, S HTsFn Indicates the allocated loss of the offshore connection transformer of the nth property wind farm in a cycle;

[0060] The no-load loss power of the onshore connection transformer in a cycle and the no-load loss power of the offshore connection transformer in a cycle are converted into square relationship and brought in to obtain the simplified calculation formula:

[0061]

[0062] As a preferred embodiment, the formula of the accurate calculation method is represented as:

[0063]

[0064] wherein, represents the onshore converter allocated loss power of the nthproprietary wind farm in the xthstatistical period, represents the onshore and offshore converter allocated loss power of the nthproprietary wind farm in the xthstatistical period, represents Y y represents the proportion of the power interval onshore converter in the power square relationship part in the xthperiod, represents Y y represents the proportion of the power interval offshore converter in the power square relationship part in the xthperiod.

[0065] In still another aspect, the present application also provides an electronic device having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the deep sea large-capacity multi-property offshore wind power centralized transmission metering method according to any one of the embodiments of the present application.

[0066] The present application has the following beneficial effects:

[0067] The present application designs the loss formulas of the onshore coupling transformer, the offshore coupling transformer, the DC submarine cable, the onshore converter and the offshore converter, and calculates the on-grid power of the wind farm based on the data collected by the metering device. This method takes into account the loss of various equipment, and can more accurately reflect the actual power generation of the wind farm, improving the accuracy of power metering.

[0068] By collecting real-time data of each device and performing power calculation and analysis based on these data, rich data support is provided for the management and operation of the wind farm. These data can be used to evaluate the operation efficiency of the wind farm, predict power generation, optimize scheduling strategies, etc., thereby improving the overall operation level of the wind farm. At the same time, these data also provide strong basis for decision makers, helping them make more scientific and reasonable decisions. BRIEF DESCRIPTION OF DRAWINGS

[0069] Figure 1 The present application provides a method implementation flowchart.

[0070] Figure 2 The present application provides a topology diagram of the offshore wind power centralized transmission system. DETAILED DESCRIPTION

[0071] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0072] It should be understood that the step numbers used herein are only for the convenience of description and are not limited to the execution sequence of the steps.

[0073] It should be understood that the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification and the appended claims of the present application, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0074] The terms "comprise" and "include" indicate the presence of described features, integers, steps, operations, elements, and / or components, but do not exclude one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0075] The term "and / or" means any combination of one or more of the associated listed items and all possible combinations thereof, and includes these combinations.

[0076] Embodiment one:

[0077] Referring to Figure 1 , the present application provides a deep-sea large-capacity multi-property offshore wind power centralized transmission metering method. The offshore wind power centralized transmission system includes a centralized transmission system, a power grid, and a wind farm. The centralized transmission system includes a land connection transformer, a sea connection transformer, a direct current submarine cable, a land converter, and a sea converter. The method includes the following steps:

[0078] Setting up a metering device to collect data;

[0079] According to the relationship between the power and loss of the land connection transformer, the sea connection transformer, the direct current submarine cable, the land converter, and the sea converter, a loss formula for the land connection transformer, the sea connection transformer, the direct current submarine cable, the land converter, and the sea converter is designed;

[0080] According to the data collected by the metering device and the loss formula, a calculation method for the on-grid power of each property wind farm in a cycle is constructed;

[0081] According to the calculation method, the on-grid power of each property wind farm in a cycle is obtained.

[0082] The topology structure of the offshore wind power centralized transmission system is shown in Figure 2 .

[0083] Referring to Figure 2 , as a preferred embodiment, the metering device includes analog metering devices D L1 , D L2 , D H1 , D H2 , and {D F1...D Fn ...D Fm}and digital metering device D H3 , D L3 ;

[0084] analog metering device D L1 is arranged at the property boundary point of the power grid and the centralized power transmission system;

[0085] analog metering device D L2 is arranged at the circuit connected by the onshore coupling transformer and the onshore converter;

[0086] analog metering device D H1 is arranged at the circuit connected by the offshore coupling transformer and the property boundary point of each wind farm;

[0087] analog metering device D H2 is arranged at the circuit connected by the offshore coupling transformer and the offshore converter;

[0088] analog metering device D F1 ...D Fn ...D Fm is arranged at the property boundary point of the centralized power transmission system and each wind farm;

[0089] wherein the D F1 ...D Fn ...D Fm in the analog metering device D Fn represents the nth device arranged at the property boundary point of the centralized power transmission system and the nth wind farm, n∈[1, m];

[0090] digital metering device D H3 is arranged at the circuit connection of the DC submarine cable and the onshore converter;

[0091] digital metering device D L3 is arranged at the circuit connection of the DC submarine cable and the offshore converter.

[0092] As a preferred embodiment, the losses of the onshore coupling transformer and the offshore coupling transformer include no-load losses and load losses;

[0093] wherein the no-load loss P TsFe is independent of the power of the onshore coupling transformer and the offshore coupling transformer, the load loss P TsGu is in a square relationship with the power of the onshore coupling transformer and the offshore coupling transformer, the size of the no-load loss P TsFe is in the interval of 10% to 20% of the load loss P TsGu ;

[0094] Loss of onshore connecting transformer P LTs is expressed as:

[0095]

[0096] Loss of offshore connecting transformer P HTs is expressed as:

[0097]

[0098] wherein K LTs represents the copper loss conversion coefficient of the onshore connecting transformer, K HTs represents the copper loss conversion coefficient of the offshore connecting transformer, represents the analog quantity metering device D L1 the square of the collected real-time power data, represents the analog quantity metering device D H1 the square of the collected real-time power data, P LTsFe represents the no-load loss of the onshore connecting transformer, P LTsGu represents the load loss of the onshore connecting transformer, P HTsFe represents the no-load loss of the offshore connecting transformer, P HTsGu the load loss of the offshore connecting transformer;

[0099] Loss of offshore connecting transformer P HTs and loss of onshore connecting transformer P LTs Loss of onshore connecting transformer of the nth property wind farm P LTsFn is expressed as:

[0100]

[0101] wherein P LTsFeFn represents the iron loss of the onshore connecting transformer of the nth property wind farm, P LTsGuFn represents the copper loss of the onshore connecting transformer of the nth property wind farm, P Fn represents the analog quantity metering device D H3 the real-time power data collected by the analog quantity metering device, ∑P Fn represents the analog quantity metering device {D F1 ...D Fn ...D Fm the real-time power data collected by the analog quantity metering device and, represents the analog quantity metering device D H3 the square of the real-time power data collected by the analog quantity metering device, represents the analog quantity metering device {D F1 ...D Fn ...D Fm the square of the real-time power data collected by the analog quantity metering device;

[0102] The shared loss P of the onshore connection transformer for the nth owned wind farm LTsFn Represented as:

[0103]

[0104] The shared loss P of the offshore connection transformer for the nth owned wind farm LTsFn Represented as:

[0105]

[0106] As a preferred embodiment, the DC submarine cable load loss P Ls :

[0107]

[0108] Among them, R L I represents the resistance of a DC submarine cable. L K represents the current passing through the DC submarine cable. Ls This represents the loss reduction factor for DC submarine cables. This represents the square of the current passing through the DC submarine cable. D represents a digital metering device H3 The square of the collected real-time power data;

[0109] Based on the square relationship between the loss and power of a DC submarine cable, the allocated loss P of the DC submarine cable for the nth owned wind farm is obtained. LsFn :

[0110]

[0111] As a preferred embodiment, the loss formulas for onshore and offshore converters include simplified and accurate calculation methods;

[0112] Based on a simplified calculation method, the relationship between loss and power for onshore and offshore converters is approximated as linear. The simplified calculation method then calculates the shared loss P of the onshore converter for the nth owned wind farm. LMsFn Represented as:

[0113]

[0114] Among them, P LMs This indicates the losses of the onshore converter;

[0115] Simplified calculation method for the offshore converter amortization loss P of the nth owned wind farm HMsFn Represented as:

[0116]

[0117] Among them, P HMsLoss of the onshore converter;

[0118] According to the precise calculation method, the loss of the onshore converter and the loss of the offshore converter have a square relationship with the power, and the loss P LMs is expressed as:

[0119]

[0120] wherein K LMs1 represents the linear coefficient of the loss of the onshore converter, K LMs2 represents the square coefficient of the loss of the onshore converter, P LMsg represents the basic loss of the onshore converter, P LMs represents the loss of the onshore converter, P LM represents the power passing through the onshore converter, represents the square of the power passing through the onshore converter;

[0121] Let there be Z statistical periods in a settlement period, and the xth statistical period is T x , x∈[1, Z], and the loss of the onshore converter in the xth statistical period is:

[0122]

[0123] wherein, represents the basic loss of the onshore converter in the xth statistical period, represents the power passing through the onshore converter in the xth statistical period, represents the square of the power passing through the onshore converter in the xth statistical period;

[0124] The loss of the onshore converter in any three adjacent periods is:

[0125]

[0126] The loss of the onshore converter in adjacent periods is subtracted:

[0127]

[0128] The formula is simplified:

[0129] Let

[0130] Let

[0131] Let

[0132] Let

[0133] Let

[0134] Let

[0135] According to the simplified formula, the land converter loss square coefficient of the xth statistical period is:

[0136]

[0137] The proportion of the land converter in the power square relationship part in the xth statistical period is:

[0138]

[0139] The remaining part of the land converter The allocated loss of the land converter of the nth property wind farm in the xth statistical period of the accurate calculation method is:

[0140]

[0141] wherein, represents the statistical electric quantity data collected by the analog quantity metering device D L3 in the xth statistical period, represents the statistical electric quantity data collected by the analog quantity metering device D L2 in the xth statistical period, represents the proportion of the land converter in the power square relationship part in the xth statistical period, represents the sum of the squares of the statistical electric quantity in a period by the property boundary point metering device D Fn of the centralized power transmission system and each wind farm, represents the sum of the squares of the statistical electric quantity in a period by the property boundary point metering device D F1 ...D Fn ...D Fm} of the centralized power transmission system and each wind farm, Fn represents the sum of the statistical electric quantity in a period by the property boundary point metering device D F1 ...D Fn ...D Fm} of the centralized power transmission system and each wind farm, represents the statistical electric quantity data collected by the analog quantity metering device D Fn in the xth statistical period, represents the statistical electric quantity data collected by the analog quantity metering device D F1 ...D Fn ...D Fm} in the xth statistical period, Fn represents the statistical electric quantity data collected by the property boundary point metering device DFn The statistical power in one cycle;

[0142] According to the same method, the loss of the offshore converter in the xth statistical cycle can be calculated accurately is:

[0143]

[0144] Wherein, D represents the analog quantity measuring device D in the xth statistical cycle H2 The statistical power data collected, D represents the analog quantity measuring device D in the xth statistical cycle H3 The statistical power data collected, S represents the proportion of the power square relationship part of the offshore converter in the xth statistical cycle.

[0145] As a preferred embodiment, the loss S of the onshore connection transformer in one cycle is: LTs is:

[0146] S LTs =S L2 -S L1 ;

[0147] The loss S of the onshore converter in one cycle is: LMs is:

[0148] S LMs =S L3 -S L2 ;

[0149] The loss S of the DC sea cable in one cycle is: Ls is:

[0150] S Ls =S H3 -S L3 ;

[0151] The loss S of the offshore converter in one cycle is: HMs is:

[0152] S HMs =S H2 -S H3 ;

[0153] The loss S of the offshore connection transformer in one cycle is: HTs is:

[0154] S HTs =S H1 -S H2 ;

[0155] Wherein, S L1S represents the metering device of the analog quantity L1 S represents the metering device of the analog quantity L2 S represents the metering device of the analog quantity L2 S represents the metering device of the analog quantity L3 S represents the metering device of the digital quantity L3 S represents the metering device of the digital quantity H3 S represents the metering device of the digital quantity H3 S represents the metering device of the digital quantity H2 S represents the metering device of the analog quantity H2 S represents the metering device of the analog quantity H1 S represents the metering device of the analog quantity H1 S represents the metering device of the analog quantity

[0156] As a preferred embodiment, the method S for calculating the on-grid power of each property wind farm in a cycle Wn The method S includes a simplified calculation method and an accurate calculation method.

[0157] As a preferred embodiment, the simplified calculation method includes a secondary accurate calculation formula and a simplified calculation formula.

[0158] The secondary accurate calculation formula is represented as:

[0159]

[0160] S represents the onshore connection transformer no-load loss power in a cycle LTsFe S represents the onshore connection transformer no-load loss power in a cycle HTsFe S represents the onshore connection transformer no-load loss power in a cycle LTsFn S represents the onshore connection transformer no-load loss power in a cycle LMsFn S represents the onshore connection transformer no-load loss power in a cycle LsFn S represents the onshore connection transformer no-load loss power in a cycle HMsFn S represents the onshore connection transformer no-load loss power in a cycle HTsFn S represents the onshore connection transformer no-load loss power in a cycle

[0161] The onshore connection transformer no-load loss power in a cycle and the offshore connection transformer no-load loss power in a cycle are converted into square relationship and brought into the simplified calculation formula:

[0162]

[0163] As a preferred embodiment, the formula of the accurate calculation method is represented as:

[0164]

[0165] wherein, represents the onshore converter allocated loss energy of the nthproperty wind farm in the xthstatistical period, represents the onshore and offshore converter allocated loss energy of the nthproperty wind farm in the xthstatistical period, represents Y y represents the proportion of the power interval onshore converter in the power square relationship part in the xthperiod, represents Y y represents the proportion of the power interval offshore converter in the power square relationship part in the xthperiod.

[0166] Embodiment two:

[0167] The embodiment provides an electronic device, which has a computer program stored thereon, and the computer program is executed by a processor to implement a deep sea large-capacity multi-property offshore wind power centralized transmission metering method according to any one of the embodiments of the application.

[0168] In the embodiments of the present application, "at least one" means one or more, and "multiple" means two or more. The "and / or" describes the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which can represent the cases of A alone, A and B together, and B alone. Wherein A and B can be singular or plural. The character " / " generally represents an "or" relationship between the front and rear associated objects. "At least one of the following" and the like means any combination of these items, including any combination of single or multiple items. For example, at least one of a, b and c can represent: a, b, c, a and b, a and c, b and c, or a and b and c, wherein a, b, and c can be single or multiple.

[0169] Those skilled in the art can realize that the units and algorithm steps described in the embodiments disclosed herein can be realized by electronic hardware, computer software and combination of electronic hardware and computer software. Whether the functions are realized by hardware or software depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0170] Those skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiments, which will not be described here.

[0171] In several embodiments provided in the present application, any function, if realized in the form of a software function unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application or the parts of the technical solutions that essentially contribute to the prior art or the parts of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the embodiments of the present application. The aforementioned storage medium includes a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0172] The above description is only some embodiments of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, based on the content of the specification and drawings of the present application, are also included in the patent protection scope of the present application.

Claims

1. A metering method for centralized transmission of large-capacity, multi-ownership offshore wind power in deep-sea areas, wherein the centralized transmission system comprises a centralized power transmission system, a power grid, and a wind farm, and the centralized power transmission system comprises an onshore interconnection transformer, an offshore interconnection transformer, a DC submarine cable, an onshore converter, and an offshore converter, characterized in that, Includes the following steps: Set up a metering device to collect data; Based on the power and loss relationship of onshore connecting transformers, offshore connecting transformers, DC submarine cables, onshore converters, and offshore converters, design loss formulas for onshore connecting transformers, offshore connecting transformers, DC submarine cables, onshore converters, and offshore converters. Based on the data collected by the metering device and the loss formula, a method for calculating the grid-connected electricity of each wind farm within one cycle is constructed. The calculation method S for the on-grid electricity of each wind farm within one cycle Wn This includes both simplified and precise calculation methods; The simplified calculation method includes a sub-precise calculation formula and a simplified calculation formula; The formula for sub-precision calculation is expressed as follows: Among them, S LTsFe S represents the no-load loss of the onshore transformer within one cycle. HTsFe S represents the no-load loss of the offshore transformer over one cycle. LTsFn S represents the allocated loss of the onshore connecting transformer in one cycle of the nth owned wind farm. LMsFn S represents the allocated loss of the onshore converter in one cycle of the nth owned wind farm. LsFn S represents the allocated loss of the DC submarine cable during one cycle of the nth owned wind farm. HMsFn S represents the allocated loss of the offshore converter in one cycle of the nth owned wind farm. HTsFn S represents the allocated loss of the offshore interconnecting transformer in one cycle of the nth owned wind farm. Fn The metering device D indicates the property boundary between the centralized power transmission system and each wind farm. Fn Electricity consumption is counted within one cycle, S L1 Indicates analog quantity measuring device D L1 Electricity consumption is counted within one cycle, S L2 Indicates analog quantity measuring device D L2 Electricity consumption is counted within one cycle, S L3 D represents a digital metering device L3 Electricity consumption is counted within one cycle, S H3 D represents a digital metering device H3 Electricity consumption is counted within one cycle, S H2 Indicates analog quantity measuring device D H2 Electricity consumption is counted within one cycle, S H1 Indicates analog quantity measuring device D H1 Electricity consumption is recorded within one cycle; By converting the no-load power loss of the onshore transformer and the offshore transformer within one cycle into a square relationship, a simplified calculation formula is obtained: The formula for the precise calculation method is expressed as follows: in, This represents the power loss allocated to the onshore converter of the nth owned wind farm in the xth statistical period. This represents the power loss shared by the onshore and offshore converters of the nth owned wind farm in the xth statistical period. Y represents y The percentage of the power square relationship in the x-th cycle for onshore converters within the power range. Y represents y The percentage of the power square relationship in the x-th cycle for an offshore converter within a power range. The analog quantity measuring device D represents the statistical period of the xth period. L3 Collected statistical electricity data, The analog quantity measuring device D represents the x-th statistical period. L2 Collected statistical electricity data, The analog quantity measuring device D represents the x-th statistical period. H2 Collected statistical electricity data, The analog quantity measuring device D represents the x-th statistical period. H3 Collected statistical electricity consumption data; The on-grid electricity volume of each wind farm within one cycle was obtained based on the calculation method.

2. The metering method for centralized transmission of large-capacity, multi-ownership offshore wind power in deep-sea areas according to claim 1, characterized in that, The measuring device includes an analog measuring device D. L1 D L2 D H1 D H2 、{D F1 ...D Fn ...D fm } and digital metering device D H3 D L3 ; Analog metering device D L1 It is located at the property boundary point between the power grid and the centralized power transmission system; Analog metering device D L2 It is installed on the circuit connecting the onshore transformer and the onshore converter; Analog metering device D H1 The circuit is installed on the offshore connecting transformer and the property boundary point of each wind farm; Analog metering device D H2 It is installed on the circuit connecting the offshore transformer and the offshore converter; Analog metering device {D F1 ...D Fn ...D Fm It is set at the property boundary between the centralized power transmission system and each wind farm; Among them, analog measurement device {D F1 ...D Fn ...D Fm D in} Fn The nth device is located at the boundary between the centralized power transmission system and the nth wind farm, where n∈[1,m]; Digital metering device D H3 It is installed at the circuit connection point between the DC submarine cable and the land-based converter; Digital metering device D L3 It is installed at the circuit connection point between the DC submarine cable and the offshore converter.

3. The metering method for centralized transmission of large-capacity, multi-ownership offshore wind power in deep-sea areas according to claim 2, characterized in that, The shared loss P of the onshore connection transformer for the nth owned wind farm LTsFn Represented as: The shared loss P of the offshore connection transformer for the nth owned wind farm LTsFn Represented as: in, Indicates analog quantity measuring device D H3 The square of the collected real-time power data. Indicates analog quantity measuring device {D F1 ...D Fn ...D Fm The sum of the squares of the collected real-time power data, P Fn Indicates analog quantity measuring device D H3 Real-time power data collected, ∑P Fn Indicates analog quantity measuring device {D F1 ...D Fn ...D Fm The collected real-time power data and P LTsFe P represents the no-load loss of the onshore transformer. HTsFe P represents the no-load loss of the offshore transformer. LTs P represents the loss of the onshore transformer. HTs This indicates the loss of the offshore transformer.

4. The metering method for centralized transmission of large-capacity, multi-ownership offshore wind power in deep-sea areas according to claim 3, characterized in that, The DC submarine cable loss P of the nth owned wind farm LsFn : Among them, P Ls This indicates the load loss of the DC submarine cable.

5. The metering method for centralized transmission of large-capacity, multi-ownership offshore wind power in deep-sea areas according to claim 4, characterized in that, The loss formulas for onshore and offshore converters include simplified and precise calculation methods. According to the simplified calculation method, the onshore converter amortization loss P of the nth owned wind farm is calculated. LMsFn Represented as: Among them, P LMs This indicates the losses of the onshore converter; Simplified calculation method for the offshore converter amortization loss P of the nth owned wind farm HMsFn Represented as: Among them, P HMs This indicates the losses of the offshore converter; According to the precise calculation method, the allocated loss of the onshore converter of the property wind farm in the nth period of the xth statistical cycle is calculated. for: in, This represents the proportion of the power square relationship component of the onshore converter within the x-th statistical period. The metering device D indicates the property boundary between the centralized power transmission system and each wind farm. Fn The square of the electricity consumption within one cycle. The metering device {D} represents the property boundary point between the centralized power transmission system and each wind farm. F1 ...D Fn ...D Fm The sum of the squares of the statistical electricity consumption within one period, ∑S Fn The metering device {D} represents the property boundary point between the centralized power transmission system and each wind farm. F1 ...D Fn ...D Fm The sum of electricity consumption within a cycle. The analog quantity measuring device D represents the x-th statistical period. Fn Collected statistical electricity data, The analog quantity metering device {D} represents the statistical period of the xth period. F1 ...D Fn ...D Fm The sum of collected statistical electricity data; Losses of offshore converters in the xth statistical period using precise calculation methods for: in, This represents the proportion of the power square relationship component of the offshore converter within the xth statistical period.

6. The metering method for centralized transmission of large-capacity, multi-ownership offshore wind power in deep-sea areas according to any one of claims 3-5, characterized in that, The loss S of the onshore transformer during one cycle LTs Represented as: S LTs =S L2 -S L1 ; The loss S of an onshore converter in one cycle LMs Represented as: S LMs =S L3 -S L2 ; The loss S of a DC submarine cable in one cycle Ls Represented as: S Ls =S H3 -S L3 ; The loss S of an offshore converter in one cycle HMs Represented as: S HMs =S M2 -S H3 ; The loss S in one cycle of the marine connection HTs Represented as: S HTs =S H1 -S H2 。 7. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the centralized transmission metering method for large-capacity, multi-ownership offshore wind power in deep-sea areas as described in any one of claims 1 to 6.

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