Large-capacity multi-property-right offshore wind power centralized delivery metering method for deep and far sea

Abstract

The invention relates to a high-capacity multi-property-right offshore wind power centralized delivery metering method for deep and far sea. The method comprises the following steps: setting a metering device to collect data; according to a land connection transformer, an offshore connection transformer, a direct current submarine cable, a land converter and a relationship between power and loss of the offshore converter, designing loss formulas of the land connection transformer, the offshore connection transformer, the direct current submarine cable, the land converter and the offshore converter; according to the data collected by the metering device and a loss formula, constructing a calculation method of the on-grid electric quantity of each property right wind field in one period; and obtaining the on-grid electric quantity of each property right wind field in one period according to a calculation method.

Description

Technical Field

[0001] The invention relates to a deep sea large-capacity multi-property offshore wind power centralized transmission metering method, belonging to the field of metering and billing. Background Art

[0002] The power industry generally defines offshore wind power with a transmission distance of more than 70km as deep sea, and defines offshore wind power with a capacity greater than 1GW as large capacity. With the continuous advancement of wind power technology, offshore wind power has developed from the initial single-machine small-scale power generation to today's large-capacity wind farms. The stable wind speed and rich wind resources in deep sea areas make these areas 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 farms more complicated.

[0003] Deep sea wind farms are usually far from the land and in deep water, requiring the use of special floating wind turbine platforms or semi-submersible platforms. Such wind farms are not only expensive to build, but also difficult to operate and maintain and transmit electricity. In order to effectively send out electricity, it is necessary to solve the problem of how to carry out efficient power transmission and metering in the harsh marine environment.

[0004] In deep-sea wind farms, cooperation among multiple property owners is usually involved, including different investors, operators and grid companies. Different property owners may have different interests in power production, distribution and metering, so an effective centralized metering method is needed to ensure fair distribution of power benefits and accurately reflect the contributions of all parties.

[0005] Prior art, such as the Chinese patent with patent number "CN113972652A", discloses a phased gateway metering method for a single-bus dual-section offshore wind farm. Including in the offshore wind farm, gateway metering points 3024 and 380 are added in the second phase. Metering point 3024 is installed between the second branch of the #2 main transformer and switch 3024, and is used for the second phase grid-connected electricity metering; metering point 380 is installed between the 35kV III bus and switch 380, and is used for the electricity metering during the maintenance of the #2 main transformer. When the first phase wind turbine is connected to the grid, switches 4E11, 46F7, 46F8, 2601, and 2602 are closed, and switches 2600, 370, and 380 are opened; the wind farm power generation is collected through the 35kV I, II, and III bus sections, flows into the #1 and #2 main transformers, and then merges into the 220kV positive bus, and finally connected to the grid through the 4E11 line. At this time, the electricity is measured by the first-phase gateway metering point, and the unified national subsidy electricity price is implemented. When the second-phase wind turbine is connected to the grid, the switch configuration remains unchanged; the power generation of the first-phase wind turbine is collected at the #1 main transformer, and the power generation of the second-phase wind turbine is collected at the #2 main transformer through the 35kV IV section bus, and then merged into the 220kV positive bus. The electricity is connected to the grid through the 4E11 line, and the national subsidy electricity price and the parity electricity price are implemented. The on-grid electricity of the offshore wind farm = the positive active power of the 4E11 line, the on-grid electricity of the first phase = the total on-grid electricity - the on-grid electricity of the second phase, and the on-grid electricity of the second phase = 3024 positive active power.

[0006] The problem with the above-mentioned prior art is that the metering is mainly based on the readings of the gateway metering points, 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 results. It is necessary to add gateway metering points at different times where wind turbines are connected to the grid, and use special algorithms to count and measure the power grid electricity in different periods. This increases the complexity and cost of management, because these gateway metering points need to be regularly maintained and calibrated, and their data needs to be accurate and reliable. Summary of the invention

[0007] In order to solve the above problems existing in the prior art, the present invention proposes a method for centralized transmission and metering of deep-sea, large-capacity, multi-ownership offshore wind power.

[0008] The technical solution of the present invention is as follows:

[0009] On the one hand, the present invention provides a deep-sea large-capacity multi-ownership offshore wind power centralized transmission metering method, the offshore wind power centralized transmission system includes a centralized power transmission system, a power grid and a wind farm, the centralized power transmission system includes an onshore connection transformer, an offshore connection transformer, a DC submarine cable, an onshore converter and an offshore converter, including the following steps:

[0010] Set up metering devices to collect data;

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

[0012] Based on the data collected by the metering device and the loss formula, a calculation method for the grid-connected electricity of each wind farm in a cycle is established;

[0013] The online power generation of each wind farm in one cycle is obtained according to the calculation method.

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

[0015] Analog quantity measuring device D L1 It is set at the property boundary between the power grid and the centralized power transmission system;

[0016] Analog quantity measuring device D L2 It is arranged on the circuit connecting the onshore connection transformer and the onshore converter;

[0017] Analog quantity measuring device D H1 Installed on the circuit connecting the offshore connection transformer and the property boundary point of each wind farm;

[0018] Analog quantity measuring device D H2 It is installed in the circuit connecting the offshore connection transformer and the offshore converter;

[0019] Analog quantity measuring device F1 ...D Fn ...D Fm}It is set at the property boundary between the centralized power transmission system and each wind farm;

[0020] Among them, the analog quantity measuring device {D F1 ...D Fn ...D Fm D in Fn represents the nth device located at the property boundary point between the centralized power transmission system and the nth wind farm, n∈[1,m];

[0021] Digital metering device D H3 Installed at the circuit connection between the DC submarine cable and the onshore converter;

[0022] Digital metering device D L3 It is installed at the circuit connection between the DC submarine cable and the offshore converter.

[0023] As a preferred implementation, the onshore connection transformer of the n-th wind farm shares the loss P LTsFn It is expressed as:

[0024]

[0025] The apportioned loss P of the offshore connection transformer of the n-th wind farm LTsFn It is expressed as:

[0026]

[0027] in, Indicates analog quantity measuring device D H3 The square of the real-time power data collected, Indicates analog quantity measuring device {D F1 ...D Fn ...D Fm The sum of the squares of the real-time power data collected, P Fn Indicates analog quantity measuring device D H3 The real-time power data collected, ∑P Fn Indicates analog quantity measuring device {D F1 ...D Fn ...D Fm}Real-time power data collected and P LTsFe Represents the no-load loss of the onshore connection transformer, P HTsFe represents the no-load loss of the offshore connection transformer, P LTs represents the loss of the onshore connection transformer, P HTs Represents the losses of the offshore connection transformer.

[0028] As a preferred embodiment, it is characterized in that the DC submarine cable loss P of the nth wind farm is shared LsFn :

[0029]

[0030] Among them, P Ls Represents the DC submarine cable load loss.

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

[0032] According to the simplified calculation method, the onshore converter loss P of the n-th wind farm with the simplified calculation method is LMsFn It is expressed as:

[0033]

[0034] Among them, P LMs represents the loss of the onshore converter;

[0035] Simplified calculation method for the apportioned loss P of the offshore converter of the n-th wind farm HMsFn It is expressed as:

[0036]

[0037] Among them, P HMs represents the loss of offshore converter;

[0038] According to the precise calculation method, the apportioned loss of the onshore converter of the n-th property wind farm in the x-th statistical period of the precise calculation method for:

[0039]

[0040] in, Indicates the analog quantity measuring device D in the xth statistical period L3 The collected statistical power data, Indicates the analog quantity measuring device D in the xth statistical period L2 The collected statistical power data, It represents the proportion of the power square relationship of the onshore converter in the xth statistical period, Metering device D representing the property boundary point between the centralized power transmission system and each wind farm Fn The square of the electricity in one cycle is counted. The metering device representing the property boundary point between the centralized power transmission system and each wind farm {D F1 ...D Fn ...D Fm The sum of the squares of the electricity counted in a cycle, ∑S Fn The metering device representing the property boundary point between the centralized power transmission system and each wind farm {D F1 ...D Fn ...D Fm}Statistical sum of power in a cycle, Indicates the analog quantity measuring device D in the xth statistical period Fn The collected statistical power data, Indicates the analog quantity measuring device of the xth statistical period {D F1 ...D Fn ...D Fm The sum of the collected statistical power data, S Fn Metering device D representing the property boundary point between the centralized power transmission system and each wind farm FnStatistical power consumption in one cycle;

[0041] Accurate calculation method for the losses of offshore converters in the xth statistical period for:

[0042]

[0043] in, Indicates the analog quantity measuring device D in the xth statistical period H2 The collected statistical power data, Indicates the analog quantity measuring device D in the xth statistical period H3 The collected statistical power data, It represents the proportion of the power square relationship of the offshore converter in the xth statistical period.

[0044] As a preferred embodiment, the loss S of the onshore connection transformer in one cycle is LTs It is expressed as:

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

[0046] The loss of onshore converter in one cycle S LMs It is expressed as:

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

[0048] The loss of DC submarine cable in one cycle S Ls It is expressed as:

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

[0050] The loss S of an offshore converter in one cycle HMs It is expressed as:

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

[0052] The loss of offshore connection in one cycle S HTs It is expressed as:

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

[0054] Among them, S L1 Indicates analog quantity measuring device D L1Statistical power consumption in one cycle, S L2 Indicates analog quantity measuring device D L2 Statistics of power consumption in one cycle, S L3 Indicates digital metering device D L3 Statistics of power consumption in one cycle, S H3 Indicates digital metering device D H3 Statistics of power consumption in one cycle, S H2 Indicates analog quantity measuring device D H2 Statistics of power consumption in one cycle, S H1 Indicates analog quantity measuring device D H1 Count the power consumption in one cycle.

[0055] As a preferred implementation, the calculation method S of the on-grid power of each wind farm in a cycle is Wn Includes simplified calculation methods as well as precise calculation methods.

[0056] As a preferred implementation, the simplified calculation method includes a sub-precise calculation formula and a simplified calculation formula;

[0057] The second most accurate calculation formula is expressed as:

[0058]

[0059] Among them, S LTsFe Indicates the no-load power loss of the onshore connection transformer in one cycle, S HTsFe Indicates the no-load power loss of the offshore connection transformer in one cycle, S LTsFn represents the apportioned loss of the onshore connection transformer in one cycle of the n-th wind farm, S LMsFn represents the apportioned loss of the onshore converter in one cycle of the n-th wind farm, S LsFn represents the amortized loss of the DC submarine cable in one cycle of the n-th wind farm, S HMsFn represents the apportioned loss of the offshore converter in one cycle of the n-th wind farm, S HTsFn represents the apportioned loss of the offshore connection transformer in one cycle of the n-th property wind farm;

[0060] The no-load power loss of the onshore connection transformer in one cycle and the no-load power loss of the offshore connection transformer in one cycle are converted into squares and the simplified calculation formula is obtained:

[0061]

[0062] As a preferred implementation, the formula of the precise calculation method is expressed as:

[0063]

[0064] in, It represents the shared power loss of the onshore converter of the n-th wind farm in the x-th statistical period, It represents the shared power loss of the onshore and offshore converters in the nth wind farm in the xth statistical period, Represents Y y The power interval is the proportion of the power square relationship of the onshore converter in the xth cycle, Represents Y y Power range: The proportion of the power square relationship of the offshore converter in the xth cycle.

[0065] On the other hand, the present invention further provides an electronic device having a computer program stored thereon, which, when executed by a processor, implements the deep-sea large-capacity multi-ownership offshore wind power centralized transmission metering method as described in any embodiment of the present invention.

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

[0067] The present invention designs loss formulas for onshore connection transformers, offshore connection transformers, DC submarine cables, onshore converters, and offshore converters, and calculates the on-grid power of the wind farm based on data collected by the metering device. This method takes into account the loss of various equipment, can more accurately reflect the actual power generation of the wind farm, and improves the accuracy of power metering.

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

[0069] Figure 1 The present invention is a flowchart for implementing the method.

[0070] Figure 2 This is a topological diagram of the offshore wind power centralized transmission system of the present invention. DETAILED DESCRIPTION

[0071] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0072] It should be understood that the step numbers used in this document are only for convenience of description and are not intended to limit the order in which the steps are executed.

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

[0074] The terms “include” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

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

[0076] Embodiment 1:

[0077] See also Figure 1 The present invention provides a deep-sea large-capacity multi-ownership offshore wind power centralized transmission metering method. The offshore wind power centralized transmission system includes a centralized power transmission system, a power grid and a wind farm. The centralized power transmission system includes an onshore connection transformer, an offshore connection transformer, a DC submarine cable, an onshore converter and an offshore converter, including the following steps:

[0078] Set up metering devices to collect data;

[0079] According to the relationship between the power and loss of the onshore connection transformer, the offshore connection transformer, the DC submarine cable, the onshore converter and the offshore converter, the loss formula of the onshore connection transformer, the offshore connection transformer, the DC submarine cable, the onshore converter and the offshore converter is designed;

[0080] Based on the data collected by the metering device and the loss formula, a calculation method for the grid-connected electricity of each wind farm in a cycle is established;

[0081] The online power generation of each wind farm in one cycle is obtained according to the calculation method.

[0082] The topological structure of the offshore wind power centralized transmission system is as follows: Figure 2 shown.

[0083] See also Figure 2 As a preferred embodiment, the metering device includes an analog metering device D L1 , D L2 , D H1 , D H2 , {D F1...D Fn ...D Fm} and digital metering device D H3 , D L3 ;

[0084] Analog quantity measuring device D L1 It is set at the property boundary between the power grid and the centralized power transmission system;

[0085] Analog quantity measuring device D L2 It is arranged on the circuit connecting the onshore connection transformer and the onshore converter;

[0086] Analog quantity measuring device D H1 Installed on the circuit connecting the offshore connection transformer and the property boundary point of each wind farm;

[0087] Analog quantity measuring device D H2 It is installed in the circuit connecting the offshore connection transformer and the offshore converter;

[0088] Analog quantity measuring device F1 ...D Fn ...D Fm}It is set at the property boundary between the centralized power transmission system and each wind farm;

[0089] Among them, the analog quantity measuring device {D F1 ...D Fn ...D Fm D in Fn represents the nth device located at the property boundary point between the centralized power transmission system and the nth wind farm, n∈[1,m];

[0090] Digital metering device D H3 Installed at the circuit connection between the DC submarine cable and the onshore converter;

[0091] Digital metering device D L3 It is installed at the circuit connection between the DC submarine cable and the offshore converter.

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

[0093] Among them, the no-load loss P TsFe Regardless of the power of the onshore and offshore connection transformers, the load loss P TsGu The no-load loss P is proportional to the power of the onshore and offshore transformers. TsFe The size of the load loss P TsGu between 10% and 20% of

[0094] Onshore connection transformer losses P LTs It is expressed as:

[0095]

[0096] Losses of offshore connection transformer P HTs It is expressed as:

[0097]

[0098] In the formula, K LTs Indicates the copper loss conversion factor of the onshore connection transformer, K HTs Indicates the copper loss conversion factor of offshore connection transformer, Indicates analog quantity measuring device D L1 The square of the real-time power data collected, Indicates analog quantity measuring device D H1 The square of the real-time power data collected, P LTsFe Represents the no-load loss of the onshore connection transformer, P LTsGu Represents the load loss of the onshore connection transformer, P HTsFe represents the no-load loss of the offshore connection transformer, P HTsGu Load losses of offshore connection transformers;

[0099] According to the loss P of the offshore connection transformer HTs The loss of the transformer connected to the land is P LTs Get the onshore connection transformer shared loss P of the n-th wind farm LTsFn , expressed as:

[0100]

[0101] Among them, P LTsFeFn P represents the iron loss of the onshore transformer of the n-th wind farm, LTsGuFn P represents the copper loss of the onshore connection transformer of the n-th wind farm, Fn Indicates analog quantity measuring device D H3 The real-time power data collected, ∑P Fn Indicates analog quantity measuring device {D F1 ...D Fn ...D Fm}Real-time power data collected and, Indicates analog quantity measuring device D H3 The square of the real-time power data collected, Indicates analog quantity measuring device {D F1 ...D Fn ...D Fm}The sum of the squares of the real-time power data collected;

[0102] The onshore connection transformer loss P of the n-th wind farm LTsFn It is expressed as:

[0103]

[0104] The apportioned loss P of the offshore connection transformer of the n-th wind farm LTsFn It is expressed as:

[0105]

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

[0107]

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

[0109] According to the square relationship between the loss of DC submarine cable and power, the DC submarine cable loss P of the nth wind farm is obtained: LsFn :

[0110]

[0111] As a preferred embodiment, the loss formulas of the onshore converter and the offshore converter include a simplified calculation method and an accurate calculation method;

[0112] According to the simplified calculation method, the loss and power relationship between the onshore converter and the offshore converter is approximated as a linear relationship. The onshore converter loss P of the nth wind farm with simplified calculation method is LMsFn It is expressed as:

[0113]

[0114] Among them, P LMs represents the loss of the onshore converter;

[0115] Simplified calculation method for the apportioned loss P of the offshore converter of the n-th wind farm HMsFn It is expressed as:

[0116]

[0117] Among them, P HMsrepresents the loss of offshore converter;

[0118] According to the precise calculation method, the loss of onshore converters and offshore converters is in a square relationship with the power. The loss of onshore converters P LMs It is expressed as:

[0119]

[0120] Among them, K LMs1 Represents the linear coefficient of onshore converter loss, K LMs2 represents the square coefficient of onshore converter loss, 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] Suppose there are Z statistical periods in a settlement period, and the xth statistical period is T x ,x∈[1,Z], the loss of the onshore converter in the xth statistical period is:

[0122]

[0123] in, 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 cycles is:

[0125]

[0126] Subtract the losses of the onshore converters in adjacent cycles:

[0127]

[0128] Simplified formula expression:

[0129] make

[0130] make

[0131] make

[0132] make

[0133] make

[0134] make

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

[0136]

[0137] The proportion of the power square relationship of the onshore converter in the xth statistical period for:

[0138]

[0139] The remaining part of the onshore converter As a linear relationship, the apportioned losses of the onshore converter of the n-th property wind farm in the x-th statistical period are accurately calculated. for:

[0140]

[0141] in, Indicates the analog quantity measuring device D in the xth statistical period L3 The collected statistical power data, Indicates the analog quantity measuring device D in the xth statistical period L2 The collected statistical power data, It represents the proportion of the power square relationship of the onshore converter in the xth statistical period, Metering device D representing the property boundary point between the centralized power transmission system and each wind farm Fn The square of the electricity in one cycle is counted. The metering device representing the property boundary point between the centralized power transmission system and each wind farm {D F1 ...D Fn ...D Fm The sum of the squares of the electricity counted in a cycle, ∑S Fn The metering device representing the property boundary point between the centralized power transmission system and each wind farm {D F1 ...D Fn ...D Fm}Statistical sum of power in a cycle, Indicates the analog quantity measuring device D in the xth statistical period Fn The collected statistical power data, Indicates the analog quantity measuring device of the xth statistical period {D F1 ...D Fn ...D Fm The sum of the collected statistical power data, S Fn Metering device D representing the property boundary point between the centralized power transmission system and each wind farmFn Statistical power consumption within a cycle;

[0142] According to the same method, the loss of offshore converter in the xth statistical period of the accurate calculation method can be obtained. for:

[0143]

[0144] in, Indicates the analog quantity measuring device D in the xth statistical period H2 The collected statistical power data, Indicates the analog quantity measuring device D in the xth statistical period H3 The collected statistical power data, It represents the proportion of the power square relationship of the offshore converter in the xth statistical period.

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

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

[0147] The loss of onshore converter in one cycle S LMs It is expressed as:

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

[0149] The loss of DC submarine cable in one cycle S Ls It is expressed as:

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

[0151] The loss S of an offshore converter in one cycle HMs It is expressed as:

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

[0153] The loss of offshore connection in one cycle S HTs It is expressed as:

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

[0155] Among them, S L1Indicates analog quantity measuring device D L1 Statistical power consumption in one cycle, S L2 Indicates analog quantity measuring device D L2 Statistics of power consumption in one cycle, S L3 Indicates digital metering device D L3 Statistics of power consumption in one cycle, S H3 Indicates digital metering device D H3 Statistics of power consumption in one cycle, S H2 Indicates analog quantity measuring device D H2 Statistics of power consumption in one cycle, S H1 Indicates analog quantity measuring device D H1 Count the power consumption in one cycle.

[0156] As a preferred implementation, the calculation method S of the on-grid power of each wind farm in a cycle is Wn Includes simplified calculation methods as well as precise calculation methods.

[0157] As a preferred implementation, the simplified calculation method includes a sub-precise calculation formula and a simplified calculation formula;

[0158] The second most accurate calculation formula is expressed as:

[0159]

[0160] Among them, S LTsFe Indicates the no-load power loss of the onshore connection transformer in one cycle, S HTsFe Indicates the no-load power loss of the offshore connection transformer in one cycle, S LTsFn represents the apportioned loss of the onshore connection transformer in one cycle of the n-th wind farm, S LMsFn represents the apportioned loss of the onshore converter in one cycle of the n-th wind farm, S LsFn represents the amortized loss of the DC submarine cable in one cycle of the n-th wind farm, S HMsFn represents the apportioned loss of the offshore converter in one cycle of the n-th wind farm, S HTsFn represents the apportioned loss of the offshore connection transformer in one cycle of the n-th property wind farm;

[0161] The no-load power loss of the onshore connection transformer in one cycle and the no-load power loss of the offshore connection transformer in one cycle are converted into squares and the simplified calculation formula is obtained:

[0162]

[0163] As a preferred implementation, the formula of the precise calculation method is expressed as:

[0164]

[0165] in, It represents the shared power loss of the onshore converter of the n-th wind farm in the x-th statistical period, It represents the shared power loss of the onshore and offshore converters in the nth wind farm in the xth statistical period, Represents Y y The power interval is the proportion of the power square relationship of the onshore converter in the xth cycle, Represents Y y Power range: The proportion of the power square relationship of the offshore converter in the xth cycle.

[0166] Embodiment 2:

[0167] This embodiment provides an electronic device having a computer program stored thereon, and when the computer program is executed by a processor, the method for concentrated transmission metering of deep-sea, large-capacity, multi-ownership offshore wind power as described in any embodiment of the present invention is implemented.

[0168] In the embodiments of the present application, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. Among them, A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c can be represented by: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, c can be single or multiple.

[0169] Those of ordinary skill in the art will appreciate that the various units and algorithm steps described in the embodiments disclosed herein can be implemented in a combination of electronic hardware, computer software, and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0170] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0171] In several embodiments provided in the present application, if any function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory; hereinafter referred to as: ROM), random access memory (Random Access Memory; hereinafter referred to as: RAM), disk or optical disk, and other media that can store program codes.

[0172] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for metering concentrated transmission of deep-sea, large-capacity, multi-ownership offshore wind power, wherein the offshore wind power concentrated transmission system comprises a concentrated power transmission system, a power grid and a wind farm, wherein the concentrated power transmission system comprises an onshore connection transformer, an offshore connection transformer, a DC submarine cable, an onshore converter and an offshore converter, wherein: The following steps are involved: Set up metering devices to collect data; According to the relationship between the power and loss of the onshore connection transformer, the offshore connection transformer, the DC submarine cable, the onshore converter and the offshore converter, the loss formula of the onshore connection transformer, the offshore connection transformer, the DC submarine cable, the onshore converter and the offshore converter is designed; Based on the data collected by the metering device and the loss formula, a calculation method for the grid-connected electricity of each wind farm in a cycle is established; The online power generation of each wind farm in one cycle is obtained according to the calculation method.

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

3. The deep sea large-capacity multi-ownership offshore wind power centralized transmission metering method according to claim 2 is characterized in that: The onshore connection transformer loss P of the n-th wind farm is shared by LTsFn It is expressed as: The apportioned loss P of the offshore connection transformer of the n-th wind farm LTsFn It is expressed as: in, Indicates analog quantity measuring device D H3 The square of the real-time power data collected, Indicates analog quantity measuring device {D F1 ...D Fn ...D Fm The sum of the squares of the real-time power data collected, P Fn Indicates analog quantity measuring device D H3 The real-time power data collected, ∑P Fn Indicates analog quantity measuring device {D F1 ...D Fn ...D Fm }Real-time power data collected and P LTsFe Represents the no-load loss of the onshore connection transformer, P HTsFe represents the no-load loss of the offshore connection transformer, P LTs represents the loss of the onshore connection transformer, P HTs Represents the losses of the offshore connection transformer.

4. The deep sea large-capacity multi-ownership offshore wind power centralized transmission metering method according to claim 3 is characterized in that: The DC submarine cable loss P of the n-th wind farm LsFn : Among them, P Ls Represents the DC submarine cable load loss.

5. The method for centralized transmission and metering of deep-sea, large-capacity, multi-ownership offshore wind power according to claim 4 is characterized in that: The loss formulas for onshore and offshore converters include simplified and accurate calculation methods; According to the simplified calculation method, the onshore converter loss P of the n-th wind farm with the simplified calculation method is LMsFn It is expressed as: Among them, P LMs represents the loss of the onshore converter; Simplified calculation method for the apportioned loss P of the offshore converter of the n-th wind farm HMsFn It is expressed as: Among them, P HMs represents the loss of offshore converter; According to the precise calculation method, the apportioned loss of the onshore converter of the n-th property wind farm in the x-th statistical period of the precise calculation method for: in, Indicates the analog quantity measuring device D in the xth statistical period L3 The collected statistical power data, Indicates the analog quantity measuring device D in the xth statistical period L2 The collected statistical power data, It represents the proportion of the power square relationship of the onshore converter in the xth statistical period, Metering device D representing the property boundary point between the centralized power transmission system and each wind farm Fn The square of the electricity in one cycle is counted. The metering device representing the property boundary point between the centralized power transmission system and each wind farm {D F1 ...D Fn ...D Fm The sum of the squares of the electricity counted in a cycle, ∑S Fn The metering device representing the property boundary point between the centralized power transmission system and each wind farm {D F1 ...D Fn ...D Fm }Statistical sum of power in a cycle, Indicates the analog quantity measuring device D in the xth statistical period Fn The collected statistical power data, Indicates the analog quantity measuring device of the xth statistical period {D F1 ...D Fn ...D Fm The sum of the collected statistical power data, S Fn Metering device D representing the property boundary point between the centralized power transmission system and each wind farm Fn Statistical power consumption in one cycle; Accurate calculation method for the losses of offshore converters in the xth statistical period for: in, Indicates the analog quantity measuring device D in the xth statistical period H2 The collected statistical power data, Indicates the analog quantity measuring device D in the xth statistical period H3 The collected statistical power data, It represents the proportion of the power square relationship of the offshore converter in the xth statistical period.

6. The deep-sea large-capacity multi-ownership offshore wind power centralized transmission metering method according to any one of claims 3 to 5, characterized in that: The loss S of the onshore connection transformer in one cycle LTs It is expressed as: S LTs =S L2 -S L1 ; The loss of onshore converter in one cycle S LMs It is expressed as: S LMs =S L3 -S L2 ; The loss of DC submarine cable in one cycle S Ls It is expressed as: S Ls =S H3 -S L3 ; The loss S of an offshore converter in one cycle HMs It is expressed as: S HMs =S H2 -S H3 ; The loss of offshore connection in one cycle S HTs It is expressed as: S HTs =S H1 -S H2 ; Among them, S L1 Indicates analog quantity measuring device D L1 Statistical power consumption in one cycle, S L2 Indicates analog quantity measuring device D L2 Statistics of power consumption in one cycle, S L3 Indicates digital metering device D L3 Statistics of power consumption in one cycle, S H3 Indicates digital metering device D H3 Statistics of power consumption in one cycle, S H2 Indicates analog quantity measuring device D H2 Statistics of power consumption in one cycle, S H1 Indicates analog quantity measuring device D H1 Count the power consumption in one cycle.

7. The deep sea large-capacity multi-ownership offshore wind power centralized transmission metering method according to claim 6 is characterized in that: The calculation method of the on-grid power of each wind farm in one cycle is S Wn Includes simplified calculation methods as well as precise calculation methods.

8. The deep sea large-capacity multi-ownership offshore wind power centralized transmission metering method according to claim 7 is characterized in that: The simplified calculation method includes a sub-precise calculation formula and a simplified calculation formula; The second most accurate calculation formula is expressed as: Among them, S LTsFe Indicates the no-load power loss of the onshore connection transformer in one cycle, S HTsFe Indicates the no-load power loss of the offshore connection transformer in one cycle, S LTsFn represents the apportioned loss of the onshore connection transformer in one cycle of the n-th wind farm, S LMsFn represents the apportioned loss of the onshore converter in one cycle of the n-th wind farm, S LsFn represents the amortized loss of the DC submarine cable in one cycle of the n-th wind farm, S HMsFn represents the apportioned loss of the offshore converter in one cycle of the n-th wind farm, S HTsFn represents the apportioned loss of the offshore connection transformer in one cycle of the n-th property wind farm; The no-load power loss of the onshore connection transformer in one cycle and the no-load power loss of the offshore connection transformer in one cycle are converted into squares and the simplified calculation formula is obtained:

9. The method for centralized transmission and metering of deep sea, large-capacity, multi-ownership offshore wind power according to claim 7 is characterized in that: The formula of the precise calculation method is expressed as: in, It represents the shared power loss of the onshore converter of the n-th wind farm in the x-th statistical period, It represents the shared power loss of the onshore and offshore converters in the nth wind farm in the xth statistical period, Represents Y y The power interval is the proportion of the power square relationship of the onshore converter in the xth cycle, Represents Y y Power range: The proportion of the power square relationship of the offshore converter in the xth cycle.

10. 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 deep-sea large-capacity multi-ownership offshore wind power centralized transmission metering method as described in any one of claims 1 to 9.

Images