A method and system for determining a wind-solar-storage-delivery channel direct current transmission curve

Abstract

The application provides a wind-solar-storage external transmission channel direct current transmission curve compiling method and system, which comprises the following steps: firstly, a wind-solar-storage external transmission channel power supply configuration and typical daily photovoltaic and wind power 24h output curve are given, the average value of wind power output from 0 to 8 in the morning and from 22 to 23 in the evening is taken as a low step of direct current transmission, then the photovoltaic output period from 9 to 16 in the day is taken as a high step of direct current transmission, the excess part is moved by energy storage, finally, the energy storage absorbs power in the evening peak period from 17 to 21 and emits, and the direct current transmission is operated according to the high step. The analysis method can provide method guidance for pure new energy extra-high voltage direct current external transmission channel planning research, provide reference for pure new energy external transmission channel dispatching operation, and has reference significance for new energy external transmission channel construction.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power system planning and new energy power generation, in particular to a wind-solar-storage external transmission channel DC power transmission curve determination method and system. BACKGROUND

[0002] With the larger-scale development of new energy, multiple wind-solar bases and supporting extra-high voltage external transmission channels are being implemented in succession. The external transmission channel will gradually change from being mainly supported by coal-fired power to being mainly supported by a high proportion of new energy, and the proportion of supporting power will gradually decrease. Due to the characteristics of new energy resources, the output of new energy has great randomness and volatility, and DC cannot maintain fixed curve power transmission. It is necessary to determine the wind-solar-storage external transmission channel DC power transmission curve in combination with the characteristics of new energy output. At present, there are few studies on DC power transmission curves, and there is no unified standard or principle for determining DC power transmission curves. SUMMARY

[0003] The purpose of the present application is to provide a wind-solar-storage external transmission channel DC power transmission curve determination method and system. According to the characteristics of new energy output and the power supply needs during the peak load period of the receiving end, combined with the storage of energy, the DC power transmission is maintained at two steps. The analysis method can provide method guidance for pure new energy extra-high voltage DC external transmission channel planning research and provide reference for pure new energy external transmission channel dispatching operation. It has reference significance for new energy external transmission channel construction.

[0004] To achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0005] A wind-solar-storage external transmission channel DC power transmission curve determination method, comprising the following steps:

[0006] Obtaining the configuration parameters of the wind-solar-storage external transmission channel;

[0007] According to the resource simulation wind power and photovoltaic output, the hourly wind power output of a typical day is given and the hourly photovoltaic output ;

[0008] Taking the average value of wind power output from 0 to 8 in the morning and from 22 to 23 in the evening as the low step of DC power transmission, the excess part is stored by energy storage, and the insufficient part is supplemented by discharging of energy storage;

[0009] Taking the photovoltaic output period from 9 to 16 in the daytime as the high step of DC power transmission, the initial value of the high step of DC power transmission is given , the excess part is moved by energy storage, combined with the energy storage capacity and the energy storage capacity, the energy storage power is calculated according to the configuration parameters of the wind-solar-storage external transmission channel ;

[0010] The energy storage moves the electric quantity to release from 17:00 to 21:00 in the evening peak period, the direct current sends the electric power according to the high step operation, the discharge power of the energy storage is calculated according to the wind light storage external sending channel configuration parameter ;

[0011] The energy storage storage capacity and the discharge electric quantity are calculated, the direct current high step sending electric power is adjusted according to the energy storage conversion efficiency , the energy storage capacity and the energy storage installed capacity constraints are satisfied .

[0012] As a further improvement of the present application, the wind light storage external sending channel configuration parameter includes: wind power installed capacity , photovoltaic installed capacity , energy storage capacity , energy storage installed capacity , energy storage conversion efficiency .

[0013] As a further improvement of the present application, the direct current low step operation power and the energy storage storage and discharge power The calculation formula is as follows:

[0014]

[0015]

[0016] If , the energy storage storage power ,

[0017] If , the energy storage power generation power .

[0018] As a further improvement of the present application, the energy storage storage power is calculated, and the formula is as follows:

[0019]

[0020] If , the energy storage storage power ;

[0021] If , the energy storage storage power ;

[0022] As a further improvement of the present application, the energy storage discharge power is calculated, and the formula is as follows:

[0023]

[0024] If , the energy storage power generation ;

[0025] If , the energy storage power generation .

[0026] As a further improvement of the present application, the energy storage storage capacity and discharge capacity The calculation formula is as follows:

[0027]

[0028] If , improve the high step power transmission ;

[0029]

[0030] If , reduce the high step power transmission .

[0031] A wind and light storage external transmission channel DC power transmission curve system, comprising:

[0032] The acquisition module is used for acquiring the wind and light storage external transmission channel configuration parameters;

[0033] The output calculation module is used for simulating the wind power and photovoltaic output according to the resources, and giving the typical day wind power hourly output and photovoltaic hourly output ;

[0034] The low step module is used for taking the average value of wind power output from 0 to 8 in the morning and from 22 to 23 in the evening as the DC power transmission low step, and the excess part is supplemented by the energy storage discharge;

[0035] The high step module is used for taking the photovoltaic output period from 9 to 16 in the daytime as the DC power transmission high step, and giving the initial value of the DC high step operation power , and the excess part is moved by the energy storage, combined with the energy storage installed capacity and the energy storage capacity, and the energy storage power is calculated according to the wind and light storage external transmission channel configuration parameters ;

[0036] The energy storage discharge module is used for discharging the energy storage moving electric quantity in the evening peak period from 17 to 21, and the DC power transmission is operated according to the high step, and the energy storage discharge power is calculated according to the wind and light storage external transmission channel configuration parameters ;

[0037] The checking module is used for calculating the energy storage storage capacity and discharge capacity , according to the energy storage conversion efficiency, the DC high step power transmission is adjusted , the energy storage capacity and the energy storage installed capacity constraints are met .

[0038] A wind and light storage external sending channel DC power transmission curve preparation device, comprising:

[0039] a memory,

[0040] a processor,

[0041] The processor is configured to perform the wind and light storage external sending channel DC power transmission curve preparation method.

[0042] A computer readable storage medium, characterized in that when the instructions in the storage medium are executed by the processor, the processor can execute the wind and light storage external sending channel DC power transmission curve preparation method.

[0043] Compared with the prior art, the present application has the following beneficial effects:

[0044] The present application first gives the wind and light storage external sending channel power supply configuration and typical daily photovoltaic and wind power 24h output curve, takes the average value of wind power output from 0 to 8 in the morning and from 22 to 23 in the evening as the low step of DC power transmission, then takes the photovoltaic output period from 9 to 16 in the daytime as the high step of DC power transmission, and the excess part is moved by energy storage, finally the energy storage absorbs the power in the evening peak period from 17 to 21 and emits, and the DC power transmission is operated according to the high step. According to the new energy output characteristics and the power supply needs of the peak load period, combined with the energy storage moving power, the DC power transmission can be maintained at two steps, which can guarantee the power supply demand in the peak load period, and on the other hand, it can reduce the energy storage moving power during the night wind power generation period. The analysis method can provide method guidance for pure new energy UHV DC external sending channel planning research, provide reference for pure new energy external sending channel dispatching operation, and has reference significance for new energy external sending channel construction. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 is a calculation flowchart;

[0046] Figure 2 is an example system wind and light storage external sending channel DC power transmission curve schematic diagram;

[0047] Figure 3 is an example system wind and light storage external sending channel supporting energy storage output schematic diagram;

[0048] Figure 4 is an electronic device structure schematic diagram of the present application. DETAILED DESCRIPTION

[0049] A wind-solar-storage external transmission channel direct current transmission curve preparation method of the application comprises the following steps:

[0050] Firstly, the wind-solar-storage external transmission channel power supply configuration and typical daily photovoltaic and wind power 24h output curve are given, the average value of wind power output from 0 to 8am and from 22pm to 23pm is taken as a low step of direct current transmission;

[0051] Then, the photovoltaic output period from 9am to 16pm in the daytime is taken as a high step of direct current transmission, and the excess part is moved by storage energy;

[0052] Finally, the storage energy absorbs power in the evening peak period from 17pm to 21pm, and the direct current transmission is operated according to the high step.

[0053] The following will be specifically described in detail.

[0054] Step one, the wind power installed capacity of the wind-solar-storage external transmission channel is given , the photovoltaic installed capacity , and the storage energy capacity , the storage energy installed capacity , the storage energy conversion efficiency ;

[0055] Step two, the wind power and photovoltaic 8760h output is simulated according to resources, and the typical daily wind power hourly output and the photovoltaic hourly output are given ;

[0056] Step three, the average value of wind power output from 0 to 8am and from 22pm to 23pm is taken as a low step of direct current transmission, the excess part is stored by storage energy, the insufficient part is supplemented by storage energy discharge, and the storage and discharge demand is basically balanced. The direct current low step operation power and the storage energy storage and discharge power are calculated according to the following formula:

[0057]

[0058]

[0059] If , the storage energy storage power ,

[0060] If , the storage energy power generation power .

[0061] Step four, the photovoltaic output period from 9am to 16pm in the daytime is taken as a high step of direct current transmission, the initial value of the direct current high step operation power is given , the excess part is moved by storage energy, and the storage energy storage power is calculated in combination with the storage energy installed capacity and the storage energy capacity , formula as follows:

[0062]

[0063] If , energy storage power ;

[0064] If , energy storage power ;

[0065] Step five, to ensure the receiving end load peak period power supply, energy storage moves the amount of electricity in the evening peak period 17 to 21 hours, DC power transmission according to high step operation, calculate the energy storage discharge power , formula as follows:

[0066]

[0067] If , energy storage power ;

[0068] If , energy storage power .

[0069] Step six, calculate the energy storage power and discharge power , according to the energy storage conversion efficiency, adjust the DC high step power transmission , under the constraint of energy storage capacity and energy storage installed to make . Energy storage power and discharge power calculation formula as follows:

[0070]

[0071] If , increase the high step power transmission ;

[0072]

[0073] If , reduce the high step power transmission .

[0074] Considering that the extra-high voltage sending channel will be mainly composed of new energy with a high proportion, the proportion of supporting power will gradually decrease, and the DC will not be able to maintain the fixed curve power transmission due to the constraints of new energy resource characteristics, based on this, the application provides a wind-solar-storage sending channel DC power transmission curve determination method, according to the new energy output characteristics and the power supply needs during the peak load period of the receiving end, combined with the storage moving power, the DC power transmission is maintained in two steps. The analysis method can provide method guidance for pure new energy extra-high voltage DC sending channel planning research, provide reference for pure new energy sending channel dispatching operation, and has reference significance for new energy sending channel construction.

[0075] The wind-solar-storage sending channel DC power transmission curve determination method is specifically described through a simulation case, so as to further illustrate the application effect of the application.

[0076] The example system is a large wind-solar base in northwest China, a UHV DC transmission channel is planned to be constructed to send clean energy to the central and eastern regions, the transmission voltage grade is ±800 kV, and the transmission scale is 80 million kWs. The channel is configured with 120 million kWs of photovoltaic, 60 million kWs of wind power and 35 million kWs of storage (5h), the storage is considered as electrochemical storage, and the conversion efficiency is about 85%.

[0077] Table 1 is a typical day wind-solar comprehensive output curve of the example system wind-solar-storage sending channel, the DC power transmission curve is determined according to the method, the results are shown in Table 2, and the storage output of the example system wind-solar-storage sending channel is shown in Table 3. The results show that the wind power generation capacity is about 17.91 million kWs from 0 to 8 and from 22 to 23, the average value is taken as the low step DC power transmission power, that is, 16.3 million kWs, the photovoltaic output period from 9 to 21 and the high peak load period in the evening are operated in the high step, after considering the storage conversion efficiency and the moving power loss, the high step is about 4.66 million kWs, the storage moving power is about 17.92 million kWs, and the power generation capacity is about 15.4 million kWs.

[0078] Table 1 is a typical day wind-solar comprehensive output curve of the example system wind-solar-storage sending channel, the DC power transmission curve is determined according to the method, the results are shown in Table 2, and the storage output of the example system wind-solar-storage sending channel is shown in Table 3. The results show that the wind power generation capacity is about 17.91 million kWs from 0 to 8 and from 22 to 23, the average value is taken as the low step DC power transmission power, that is, 16.3 million kWs, the photovoltaic output period from 9 to 21 and the high peak load period in the evening are operated in the high step, after considering the storage conversion efficiency and the moving power loss, the high step is about 4.66 million kWs, the storage moving power is about 17.92 million kWs, and the power generation capacity is about 15.4 million kWs.

[0079]

[0080] Table 2 is the determination of the DC power transmission curve of the example system wind-solar-storage sending channel, unit: million kWs

[0081]

[0082] Table 3 is the storage output of the example system wind-solar-storage sending channel, unit: million kWs

[0083]

[0084] In summary, for the wind power storage external transmission channel, the direct current power transmission curve is determined according to the method, power supply during the late peak period can be ensured to a certain extent, and the storage moving power can be reduced during the night only when the wind power generation, thereby providing a reference for direct current engineering construction and dispatching operation.

[0085] The application further provides a wind power storage external transmission channel direct current power transmission curve determination system, comprising:

[0086] The acquisition module is configured to acquire wind power storage external transmission channel configuration parameters.

[0087] The output calculation module is configured to simulate wind power and photovoltaic output according to resources, and give typical daily wind power hourly output and photovoltaic hourly output .

[0088] The low step module is configured to take the average value of wind power output from 0 to 8 in the morning and from 22 to 23 in the evening as the direct current power transmission low step, and the excess part is stored by the storage, and the insufficient part is supplemented by discharging the storage.

[0089] The high step module is configured to take the photovoltaic output period from 9 to 16 in the day as the direct current power transmission high step, and give the initial value of the direct current high step operation power , and the excess part is moved by the storage, and the storage installed capacity and the storage capacity are combined to calculate the storage power according to the wind power storage external transmission channel configuration parameters.

[0090] The storage discharging module is configured to discharge the storage moving power during the late peak period from 17 to 21, and the direct current power transmission is operated according to the high step, and the storage discharging power is calculated according to the wind power storage external transmission channel configuration parameters .

[0091] The checking module is configured to calculate the storage power and discharging power , check according to the storage conversion efficiency, adjust the direct current high step power transmission power , and make under the constraints of the storage capacity and the storage installed capacity.

[0092] As shown in Figure 4 , another object of the application is to provide a wind power storage external transmission channel direct current power transmission curve determination device, comprising:

[0093] a memory,

[0094] a processor,

[0095] The processor is configured to execute the wind power storage external transmission channel direct current power transmission curve determination method.

[0096] The application further provides a computer readable storage medium, when instructions in the storage medium are executed by a processor, the processor can execute the wind, light, storage and delivery channel direct current transmission curve fitting method.

[0097] Those skilled in the art will appreciate that embodiments of the application can be provided as methods, systems, or computer program products. Accordingly, the application can be embodied in the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the application can be embodied in the form of a computer program product on one or more computer readable storage media (including, but not limited to, disk memory, CD-ROM, optical memory, etc.) having computer usable program code embodied therein.

[0098] The application is described with reference to the flowcharts and / or block diagrams of the methods, apparatus (systems), and computer program products according to embodiments of the application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, as well as combinations of flows and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, a special purpose computer, an embedded processor, or other programmable data processing apparatus to produce a machine, so that the instructions, which are executed via the processor of the computer or other programmable data processing apparatus, generate a means for implementing the functions specified in the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 means for carrying out the functions specified in the flowchart

[0099] These computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing apparatus to work in a specific manner, so that the instructions stored in the computer readable memory produce a manufactured product including instruction means, which implement the functions specified in the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 means for carrying out the functions specified in the flowchart

[0100] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus, so that a series of operation steps are executed on the computer or other programmable data processing apparatus to produce a computer implemented process, so that the instructions executed on the computer or other programmable data processing apparatus provide a means for implementing the functions specified in the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 means for carrying out the functions specified in the flowchart

[0101] It should be pointed out finally that the above embodiments are only used to illustrate the technical solutions of the present application but not to limit it. Although the present application has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the specific embodiments of the present application can be modified or replaced equivalently without departing from the spirit and scope of the present application, and any modification or equivalent replacement without departing from the spirit and scope of the present application should be covered in the protection scope of the claims of the present application.

Claims

1. A method for determining the DC power transmission curve of a wind-solar-storage transmission channel, characterized in that, Includes the following steps: Obtain the configuration parameters for the wind, solar, and energy storage transmission channels; Based on resource simulations of wind and solar power output, the hourly wind power output for a typical day is given. Photovoltaic power output per hour ; The average wind power output from 0:00 to 8:00 and from 22:00 to 23:00 is taken as the low step of DC power transmission. The part of wind power output exceeding the low step of DC power transmission is stored by energy storage, and the part of wind power output below the low step of DC power transmission is supplemented by energy storage discharge. During the daytime photovoltaic power output period from 9:00 to 16:00, DC power transmission is used in a high-step manner. The initial power values ​​for the DC high-step operation are given. The portion of photovoltaic power output exceeding the DC power transmission threshold is transferred via energy storage. Based on the installed capacity and power storage capacity, and considering the configuration parameters of the wind-solar-storage transmission channel, the energy storage power is calculated. ; The energy stored electricity is released during the evening peak period from 5 PM to 9 PM. DC power transmission operates at a high-step rate, and the energy storage discharge power is calculated based on the configuration parameters of the wind-solar-storage transmission channel. ; Calculate the amount of energy stored and discharge capacity Verify the energy storage conversion efficiency and adjust the DC high-step power transmission. Under the constraints of energy storage capacity and installed capacity, ; Obtaining configuration parameters for wind, solar, and energy storage transmission channels includes: wind power installed capacity. Photovoltaic installations and energy storage capacity Energy storage installations Energy storage conversion efficiency .

2. The method for determining the DC power transmission curve of a wind-solar-storage transmission channel according to claim 1, characterized in that, DC low-step operating power and energy storage and discharge power The calculation formula is as follows: like Energy storage power , like Energy storage power generation .

3. The method for determining the DC power transmission curve of a wind-solar-storage transmission channel according to claim 1, characterized in that, Calculate energy storage power The formula is as follows: like Energy storage power ; like Energy storage power .

4. The method for determining the DC power transmission curve of a wind-solar-storage transmission channel according to claim 1, characterized in that, Calculate the energy storage discharge power The formula is as follows: like Energy storage power generation ; like Energy storage power generation .

5. The method for determining the DC power transmission curve of a wind-solar-storage transmission channel according to claim 1, characterized in that, Energy storage and electricity storage and discharge capacity The calculation formula is as follows: like Increase the power transmission capacity of high-step power generation ; like Reduce high-step power transmission .

6. A system for determining the DC power transmission curve of a wind-solar-storage transmission channel, characterized in that, include: The acquisition module is used to acquire configuration parameters for wind, solar, and energy storage transmission channels. The output calculation module is used to simulate wind and solar power output based on resources, and provide hourly wind power output for a typical day. Photovoltaic power output per hour ; The low-step module is used to take the average wind power output from 0:00 to 8:00 in the morning and from 22:00 to 23:00 in the evening as the low step of DC power transmission. The part of wind power output exceeding the low step of DC power transmission is stored by energy storage, and the part of wind power output below the low step of DC power transmission is supplemented by energy storage discharge. The high-step module is used for DC power transmission during the daytime photovoltaic output period from 9:00 to 16:

00. The initial value of the DC high-step operating power is provided. The portion of photovoltaic power output exceeding the DC power transmission threshold is transferred via energy storage. Based on the installed capacity and power storage capacity, and considering the configuration parameters of the wind-solar-storage transmission channel, the energy storage power is calculated. ; The energy storage discharge module is used to release stored electricity during the evening peak period from 5 PM to 9 PM. DC power transmission operates at a high-step rate, and the energy storage discharge power is calculated based on the configuration parameters of the wind-solar-storage transmission channel. ; The verification module is used to calculate the energy storage capacity. and discharge capacity Verify the energy storage conversion efficiency and adjust the DC high-step power transmission. Under the constraints of energy storage capacity and installed capacity, , For energy storage conversion efficiency.

7. A device for determining the DC power transmission curve of a wind-solar-storage transmission channel, characterized in that, include: memory, processor, The processor is configured to execute the method for determining the DC power transmission curve of the wind-solar-storage transmission channel as described in any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that, When the instructions in the storage medium are executed by the processor, the processor is able to perform the method for determining the DC power transmission curve of the wind-solar-storage transmission channel as described in any one of claims 1 to 5.

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